2024-03-29T08:21:47Zhttps://idus.us.es/oai/requestoai:idus.us.es:11441/1496472024-02-15T07:50:57Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Effects of particle size and field orientation on the yield stress of magnetostabilized fluidized beds
Valverde Millán, José Manuel
Sánchez Quintanilla, Miguel Angel
Espín Milla, Manuel Jesús
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Universidad de Sevilla. FQM253: Electrohidronámica y Medios Granulares Cohesivos
Junta de Andalucía
Ministerio de Ciencia y Tecnología (MCYT). España
Particle size
Field orientation
Magnetostabilized fluidized beds
In this work, we present experimental measurements of the yield stress of gas-fluidized beds of magnetizable particles stabilized by an externally imposed magnetic field. Powder samples consist of spherical magnetite particles 35-65 μm in size. The magnetic field is applied in the bubbling regime and the gas velocity is decreased. At a critical gas velocity, particle chains that have formed due to attractive magnetostatic forces become jammed and the bed transits to a solidlike expanded state with a non-negligible yield stress. Our experimental setup allows us for taking measurements of the yield stress of the bed stabilized by a magnetic field oriented either in the vertical or horizontal direction (co-flow and cross-flow field configurations, respectively). In the cross-flow field configuration, the magnetic yield stress is increased with particle size. On the other hand, the magnetic yield stress is decreased in the co-flow field configuration as particle size is increased. This is interpreted as due to the dependence of the interparticle magnetostatic force on the interparticle contact angle with the field, which is, on average, affected by particle size in the jammed bed subjected to small consolidations.
2023-10-11T06:40:56Z
2023-10-11T06:40:56Z
2012-05-23
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/149647
eng
Industrial & Engineering Chemistry Research (IECRED), 51 (23), 8134-8140.
FQM-5735
IS2011-25161
https://pubs.acs.org/doi/epdf/10.1021/ie300075z
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Chemical Society
oai:idus.us.es:11441/1500462024-02-17T17:03:01Zcom_11441_11306com_11441_11290com_11441_10690com_11441_10853com_11441_10802col_11441_11307col_11441_10854
Building and environmental acoustics in obsolete residential neighbourhoods: The case of San Pablo, Spain
Girón Borrero, Sara
Martel Villagrán, Jesús
Galindo del Pozo, Miguel
Herrera-Limones, Rafael
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
Universidad de Sevilla. TEP130: Arquitectura, Patrimonio y Sostenibilidad: Acústica, Iluminación, Óptica y Energía
Universidad de Sevilla. TIC112: Microondas
Universidad de Sevilla. HUM965: Transhumancias: Hábitat, Salud, Patrimonio, Tecnología y Arte
Acoustic quality
Environmental acoustics
Obsolescence
Social dwelling
Noise pollution
Acoustic insulation
Urban noise
In order to establish an agreement between the objectives of acoustic quality in the outdoor environment and the acoustic insulation in a building as required in the current legislation in Spain, the acoustic insulation of typical social housing has been studied in the residential neighbourhood of San Pablo in Seville. Field measurements based on acoustic sonometry have been performed in its public areas, together with the consultations to the strategic noise maps prepared by the administration of the city and with data from a questionnaire answered by neighbours on the perception of environmental and domestic noise. These inputs have enabled calculations of airborne and impact noise insulation in a typical dwelling of the neighbourhood. The neighbourhood presents various kinds of obsolescence, as do many residential estates built in Europe in the same period, mainly in terms of its low quality of construction and structural solutions, its energy poverty, and its typology. Results on acoustic insulation indicate that the requirements of current Spanish legislation have not been met, Dnt,A = 49 dBA, L'nT,w = 80 dB. However, thanks not only to the urban layout of the various types of housing blocks in the neighbourhood, but also to the breadth and abundance of green and common areas and to their roads, the existing environmental sound levels remain below the established limit: Ld < 60 dBA. Hence, the calculation for the external noise insulation in façades indicates that the requirements are met, D2m,nT,Atr = 33 dBA. In the acoustic survey, most people consider the environmental acoustic conditions of the neighbourhood to be acceptable or good and believe that they are barely affected by the domestic noise of next-door neighbours. The research found that social heritage neighbourhoods of the 1960s and 1970s, laid out with cul-de-sacs, curved layouts, and small pockets of parking, significantly improve their urban acoustic performance.
2023-11-02T08:40:19Z
2023-11-02T08:40:19Z
2023-09
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/150046
eng
Heliyon, 9(9) (e19414).
US.20-11
https://www.sciencedirect.com/science/article/pii/S2405844023066227?via%3Dihub
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1443592024-02-22T11:03:10Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Geometric driving of two-level quantum systems
Ying, Zu-Jian
Gentile, Paola
Baltanás, José P.
Frustaglia, Diego César
Ortix, Carmine
Cuoco, Mario
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Economía y Competitividad (MINECO). España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
National Natural Science Foundation of China
Cyclic evolutions
Two-level quantum systems
We investigate a class of cyclic evolutions for driven two-level quantum systems (effective spin 1/2) with a particular focus on the geometric characteristics of the driving and their specific imprints on the quantum dynamics. By introducing the concept of geometric driving curvature for any field trajectory in the parameter space, we are able to unveil underlying patterns in the overall quantum behavior: the knowledge of the driving curvature provides a nonstandard and fresh access to the interrelation between field and spin trajectories, and the corresponding quantum phases acquired in nonadiabatic cyclic evolutions. In this context, we single out setups in which the driving field curvature can be employed to demonstrate a pure geometric control of the quantum phases. Furthermore, the driving field curvature can be naturally exploited to introduce the geometrical torque and derive a general expression for the total quantum phase acquired in a cycle. Remarkably, such relation allows to access the mechanisms controlling the changeover of the quantum phase across a topological transition and to disentangle the role of the spin and field topological windings. As for implementations, we discuss a series of physical systems and platforms to demonstrate how the geometric control of the quantum phases can be realized for pendular field drivings. This includes setups based on superconducting islands coupled to a Josephson junction and inversion-asymmetric nanochannels with suitably tailored geometric shapes.
2023-04-14T08:37:30Z
2023-04-14T08:37:30Z
2020
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/144359
eng
Physical Review Research, 2 (023167).
FIS2014-53385-P
FIS2017-86478-P
EU/H2020
680-47-543
11974151
20177SL7HC
https://journals.aps.org/prresearch/pdf/10.1103/PhysRevResearch.2.023167
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1464762023-12-20T07:45:14Zcom_11441_10848com_11441_10802com_11441_10690com_11441_10853col_11441_10849col_11441_10854
A simple method for efficiency calibration of HPGe detectors in gamma-spectrometric measurements
Pérez Moreno, J. P.
Bolívar, Juan Pedro
García-Tenorio García-Balmaseda, Rafael
Gutiérrez San Miguel, Enrique
Aguado Casas, Juan Luis
Mas Balbuena, José Luis
Vaca Galán, Federico
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Física Aplicada I
Gamma-spectrometry
Efficiency-calibration
Self-absorption
Sample-height
In this paper a simple, rapid and general method for g-ray efficiency calibration of Ge detectors for environmental
samples is presented. This method is based on the use of an active natural solid sample with several g-emissions (in our
case, 226Ra) as the calibrating matrix for determining the full energy peak efficiency (FEPE) ec vs g-emission energy Eg
and the sample height h in a counting cylindrical geometry. The 226Ra activity concentration is determined by a-particle
spectrometry, a method that has previously been validated
2023-05-19T18:28:49Z
2023-05-19T18:28:49Z
2001
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/146476
eng
Radiation Physics and Chemistry, 61 (3-6), 437-438.
https://doi.org/10.1016/S0969-806X(01)00290-0
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1462582024-02-17T17:47:56Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
210Po levels and distribution in different environmental compartments from a coastal lagoon. The case of Briozzo lagoon, Uruguay
Bañobre, Cristina
Díaz Francés, Inmaculada
Scarabino, Fabrizio
Fornaro, Laura
García-Tenorio García-Balmaseda, Rafael
Universidad de Sevilla. Departamento de Física Aplicada II
Polonium-210
Freshwater lagoon
Bioaccumulation
Distribution coefficients
Concentration ratios
This paper presents the levels and distribution of 210Po in different compartments of a coastal lagoon on the east
coast of Uruguay (South America). Activity concentrations of 210Po have been obtained in different matrices,
such as water, superficial sediments, clams (Diplodon sp.), freshwaters snails (Pomacea sp.), zooplankton, and
fishes (Jenynsia sp.), collected at different points of the lagoon and during several sampling campaigns. In
addition, the organic matter content of the sediment was determined to study the variation of 210Po along the
lagoon.
The activity concentrations of 210Po in the water samples are in the range between 1.1 � 0.2–3.5 � 0.4 mBq/L
while in the sediment samples vary between 17.1 � 1.4 and 540 � 12 Bq/kg, DW. In the case of biota, the ranges
obtained were 182 � 5–265 � 6 Bq/kg, DW in clams and 134 � 4–1245 � 16 Bq/kg, DW in snail samples.
A good correlation of 210Po with the organic fractions of the sediment was observed (r ¼ 0.8798, p-value <
0.001), being obtained high values for the distribution coefficient Kd (104 -105
). In the biota samples, a clear
difference was observed in the 210Po concentration values in both species, mainly due to the different feeding
habits of both aquatic organisms, as it is reflected in the associated concentration ratios (CR).
In this paper, a good set of results of 210Po, Kd, and CR have been obtained in different matrices, enhancing the
limited archives available for modelers concerning these parameters for 210Po and freshwater systems.
2023-05-17T16:52:52Z
2023-05-17T16:52:52Z
2020
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/146258
eng
Journal of Environmental Radioactivity, 222, 1-10.
https://doi.org/10.1016/j.jenvrad.2020.106352
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1354782024-02-14T11:09:44Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Device-independent quantum key distribution based on Bell inequalities with more than two inputs and two outputs
Gonzalez Ureta, Junior Ricardo
Predojević, Ana
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Quantum
Bell inequalities
Inputs
Outputs
Device-independent quantum key distribution (DI-QKD) offers the strongest form of security against eavesdroppers bounded by the laws of quantum mechanics. However, a practical implementation is still pending due to the requirement of combinations of visibility and detection efficiency that are beyond those possible with current technology. This mismatch motivates the search for DI-QKD protocols that can close the gap between theoretical and practical security. In this work, we present two DI-QKD protocols whose security relies on Bell inequalities with more than two inputs and two outputs. We show that, for maximally entangled states and perfect visibility, a protocol based on a Bell inequality with three inputs and four outputs requires a slightly lower detection efficiency than the protocols based on Bell inequalities with two inputs and two outputs.
2022-07-18T10:26:52Z
2022-07-18T10:26:52Z
2021-05-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135478
eng
Physical Review A, 103 (5 (052436))
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.103.052436
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1481592024-02-13T09:17:52Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Significant loophole-free test of Kochen-Specker contextuality using two species of atomic ions
Wang, Pengfei
Zhang, Junhua
Luan, Chun-Yang
Um, Mark
Wang, Ye
Qiao, Mu
Xie, Tian
Zhang, Jing-Ning
Cabello Quintero, Adán
Kim, Kihwan
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
National Natural Science Foundation of China
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Ministerio de Economia, Industria y Competitividad (MINECO). España
Guangdong Basic and Applied Basic Research Foundation
Kochen-Specker contextuality
Atomic ions
Quantum measurements cannot be thought of as revealing preexisting results, even when they do not disturb any other measurement in the same trial. This feature is called contextuality and is crucial for the quantum advantage in computing. Here, we report the observation of quantum contextuality simultaneously free of the detection, sharpness, and compatibility loopholes. The detection and sharpness loopholes are closed by adopting a hybrid two-ion system and highly efficient fluorescence measurements offering a detection efficiency of 100% and a measurement repeatability of >98%. The compatibility loophole is closed by targeting correlations between observables for two different ions in a Paul trap, a 171Yb+ ion and a 138Ba+ ion, chosen so measurements on each ion use different operation laser wavelengths, fluorescence wavelengths, and detectors. The experimental results show a violation of the bound for the most adversarial noncontextual models and open a way to certify quantum systems.
2023-07-21T11:25:37Z
2023-07-21T11:25:37Z
2022-02-09
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/148159
eng
Science Advances, 8(6) (abk1660).
2016YFA0301900
2016YFA0301901
92065205
11974200
US-15097
CI2019-111885-2
2019A1515111135
2019B030330001
https://www.science.org/doi/epdf/10.1126/sciadv.abk1660
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Association for the Advancement of Science
oai:idus.us.es:11441/1445652024-02-17T17:14:49Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Monolithic integration of graphene in SiC radiation sensors for harsh-environment applications
Otero Ugobono, Sofía
Rafí Tatjer, Joan Marc
Godignon, Philippe
Pellegrini, Giulio
Rius Suñé, Gemma
Jiménez Ramos, María del Carmen
García López, Francisco Javier
García Osuna, Adrián
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Universidad de Sevilla. RNM138: Física Nuclear Aplicada
Agencia Estatal de Investigación. España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Epitaxial graphene
Detectors
Radiation hardness
Resistivity
CTLM
Due to their low leakage current, low noise levels, high thermal conductivity, and potential radiation hardness, SiC devices offer various advantages over Si devices in certain applications. As a result, they are being considered for operation in harsh environments, such as plasma diagnostic systems in future nuclear fusion reactors or in high energy physics applications. We report on relevant results of the GRACE project, which seeks to deliver a new generation of SiC sensors with graphene-enhanced contacts. Such devices are aimed to be radiation-hard and functional at high temperatures. The work presented in this paper focuses on the optimisation of the electrical contacts, along with the electrical characterisation and radiation-tolerance assessment of the first sensor prototypes produced.
2023-04-18T07:41:42Z
2023-04-18T07:41:42Z
2022
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/144565
eng
Materials Science Forum, 1062, 458-462.
RTC-2017-6369-3
https://www.scientific.net/MSF.1062.458.pdf
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Trans Tech Publications
oai:idus.us.es:11441/1534122024-02-17T16:46:18Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Low concentration CO2 capture in fluidized beds of Ca(OH)2 as affected by storage humidity
Moreno González, H.
Pontiga Romero, Francisco de Paula
Valverde Millán, José Manuel
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
CO2 capture
Calcium hydroxide
Direct air capture
Pre-hydration
Storage conditions
Fluidized bed
Carbonation
Carbon negative emission technologies (NETs) such as CO2 direct air capture (DAC) are being already considered
as necessary for climate change mitigation. This paper investigates CO2 capture at room temperature and atmospheric pressure by a fluidized bed of Ca(OH)2 powder as influenced by the relative humidity (RH) to which
this sorbent was exposed during storage. Humidity is precisely controlled by means of several supersaturared salt
solutions, and FTIR spectrometry is used to measure accurately the time evolution of CO2 and H2O concentrations in the effluent gas. Results show that CO2 capture is promoted by an increase of the storage RH. The
observed effect is particularly important for very high storage RH (~100%, near the dew point). After the capture
tests, quantitative analyses of sample composition have been carried out using X-ray powder diffractometry.
These analyses have revealed that the CaCO3 content after CO2 capture originates from carbonation in samples
that were stored under ~100% RH. On the other hand, in samples stored under low to moderate RH, the presence
of CaCO3 is significantly reduced, indicating that most of CO2 capture might take place through physical
adsorption.
2024-01-15T20:05:10Z
2024-01-15T20:05:10Z
2020
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/153412
eng
Chemical Engineering Journal, 407, 1-9.
https://doi.org/10.1016/j.cej.2020.127179
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1359572024-02-17T17:11:58Zcom_11441_10853com_11441_10802com_11441_10690com_11441_10893col_11441_10854col_11441_10894
Basic exclusivity graphs in quantum correlations
Cabello Quintero, Adán
Danielsen, Lars Eirik
López Tarrida, Antonio José
Portillo Fernández, José Ramón
Universidad de Sevilla. Departamento de Matemática Aplicada I (ETSII)
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM-239: Fundamentos de Mecánica Cuántica
Universidad de Sevilla. FQM-164: Matemática Discreta: Teoría de Grafos y Geometría Computacional
Ministerio de Economía y Competitividad (MINECO). España
A fundamental problem is to understand why quantum theory only violates some noncontextuality (NC)
inequalities and identify the physical principles that prevent higher-than-quantum violations. We prove that
quantum theory only violates those NC inequalities whose exclusivity graphs contain, as induced subgraphs,
odd cycles of length five or more, and/or their complements. In addition, we show that odd cycles are the
exclusivity graphs of a well-known family of NC inequalities and that there is also a family of NC inequalities
whose exclusivity graphs are the complements of odd cycles. We characterize the maximum noncontextual and
quantum values of these inequalities, and provide evidence supporting the conjecture that the maximum
quantum violation of these inequalities is exactly singled out by the exclusivity principle.
Ministerio de Economía y Competitividad FIS2011-29400
2022-07-28T10:24:20Z
2022-07-28T10:24:20Z
2013
info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
https://idus.us.es/handle//11441/135957
eng
Physical Review A, 88 (3, art. nº 032104), 032104-1-032104-7.
FIS2011-29400
https://journals.aps.org/pra/abstract/10.1103/PhysRevA.88.032104
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1540752024-01-26T11:43:13Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Geometric vector potentials from nonadiabatic spin dynamics
Baltanás, José P.
Saarikoski, H.
Reynoso, Andrés Alejandro
Frustaglia, Diego César
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Economia, Industria y Competitividad (MINECO). España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Japan Society for the Promotion of Science
Geometric vector potential
Spin dynamics
We propose a theoretical framework that captures the geometric vector potential emerging from the nonadiabatic spin dynamics of itinerant carriers subject to arbitrary magnetic textures. Our approach results in a series of constraints on the geometric potential and the nonadiabatic geometric phase associated with it. These constraints play a decisive role when studying, e.g., the geometric spin phase gathered by conducting electrons in ring interferometers under the action of in-plane magnetic textures, allowing a simple characterization of the topological transition recently reported by Saarikoski et al. [H. Saarikoski, J. E. Vázquez-Lozano, J. P. Baltanás, F. Nagasawa, J. Nitta, and D. Frustaglia, Phys. Rev. B 91, 241406(R) (2015)].
2024-01-26T11:43:13Z
2024-01-26T11:43:13Z
2017-07-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/154075
eng
Physical Review B (condensed matter and materials physics), 96 (3), 035312-1-035312-5.
FIS2014-53385-P
17K05510
https://journals.aps.org/prb/pdf/10.1103/PhysRevB.96.035312
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1552522024-02-15T07:43:22Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Quantum nonlocality via local contextuality with qubit-qubit entanglement
Saha, Debashis
Cabello Quintero, Adán
Choudhary, Sujit K.
Pawłowski, Marcin
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Economía y Competitividad (MINECO). España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Quantum nonlocality
Contextuality
Alice-Bob correlations
Quantum nonlocality can be revealed “via local contextuality” in qudit-qudit entangled systems with
d
>
2
, that is, through the violation of inequalities containing Alice-Bob correlations that admit a local description, and Alice-Alice correlations (between the results of sequences of measurements on Alice's subsystem) that admit a local (but contextual) description. A fundamental question to understand the respective roles of entanglement and local contextuality is whether nonlocality via local contextuality exists when the parties have only qubit-qubit entanglement. Here we respond affirmatively to this question. This result further clarifies the connection between contextuality and nonlocality and opens the door for observing nonlocality via local contextuality in actual experiments.
2024-02-15T07:43:22Z
2024-02-15T07:43:22Z
2016-04-28
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/155252
eng
Physical Review A (atomic, molecular, and optical physics and quantum information), 93 (4), 042123-1-042123-5.
FIS2014-60843
2013/08/M/ST2/00626
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.93.042123
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1429672024-02-14T13:42:53Zcom_11441_10818com_11441_10802com_11441_10690com_11441_10853com_11441_11230com_11441_11099col_11441_10819col_11441_10854col_11441_11231
Evolution of annual rainfall irregularity in the southwest of the Iberian Peninsula
García Barrón, Leoncio
Aguilar Alba, Mónica
Sousa Martín, Arturo
Universidad de Sevilla. Departamento de Biología Vegetal y Ecología
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Geografía Física y Análisis Geográfico Regional
Ministerio de Educación y Ciencia (MEC). España
The areas of the Iberian Peninsula with Mediterranean climate are characterised by rainfall irregularity. Standard statistical estimation methods provide a limited insight of all the dimensions of such irregularity. Based on different techniques to describe the inter-annual irregularity of rainfall, the authors develop a new method: the disparity indices. These indices are then applied to several historical rainfall series (dating from the end of the nineteenth century up to the present) from the southwest of the Iberian Peninsula. Similar rainfall irregularity patterns are found in all weather stations in the studied area, confirming their belonging to the same climatic region. The results indicate a relative stability during the first third of the twentieth century, coinciding with a period of low precipitation and a progressive increase during the last three decades. The use of a new index named specific disparity index has proven be useful in highlighting the irregularity within the rainfall series at each meteorological station. This new index could contribute to monitor future changes in precipitation within the general framework of research on climate change. Although Mediterranean ecosystems are adapted to important fluctuations in the rainfall regime, this increase in irregularity may affect rivers, wetlands and the hygrophytic vegetation.
Ministerio de Educación y Ciencia CGL2006-07194/BOS, CGL2009-10683
2023-02-23T18:40:03Z
2023-02-23T18:40:03Z
2011
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/142967
eng
Theoretical and Applied Climatology, 103 (1), 13-26.
CGL2006-07194/BOS
CGL2009-10683
https://doi.org/10.1007/s00704-010-0280-0
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Springer Nature
oai:idus.us.es:11441/997522024-02-17T17:17:35Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Natural radionuclides (NORM) in a Moroccan river affected by former conventional metal mining activities
Manjón, Guillermo
Mantero, Juan
Vioque, Ignacio
Díaz Francés, Inmaculada
Galván, José
Chakiri, Said
Choukri, Abdelmajid
García-Tenorio García-Balmaseda, Rafael
Universidad de Sevilla. Departamento de Física Aplicada II
Spanish Agency of International Cooperation and Development (AECID) of the Government of Spain
NORM (naturally occurring radioactive material)
Abandoned mines
Moulouya river
Morocco
The main aim of this work was to determine the levels of multiple natural radionuclides in an aquatic system(Moulouya river, Morocco) impacted by multiple abandoned Zinc and Lead mines.238U,234U,232Th,230Th and210Po were determined by alpha-particle spectrometry in water and sediment samples collected along the riverand in samples from three pit lakes of abandoned mines, located in the Upper Moulouya catchment area.The results enabled the analysis of the different levels of impact of former mining activities, depending on thenatural radionuclides. While the activity concentration of U-isotopes in Moulouya river water was slightlyelevated in the vicinity of abandoned mine wastes, other natural radionuclides (Th-isotopes and210Po) levelswere typical of a natural environment. This fact is clearly reflected in the magnitude and range observed in thedistribution coefficients for the different radionuclides analyzed.
2020-07-22T12:58:27Z
2020-07-22T12:58:27Z
2019-02
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/99752
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Minería Sostenible
oai:idus.us.es:11441/1354842024-02-14T20:04:38Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Radiological impact of naturally occurring radionuclides in bottled water
Piñero García, Francisco
Thomas, R.
Mantero Cabrera, Juan
Forssell-Aronsson, Eva
Isaksson, Mats
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. RNM138: Fisica Nuclear Aplicada
Natural radioactivity
Drinking water
Polonium
Lead
Radium
Uranium
Consumption of bottled water is increasing year after year in Europe. Due to the local geology from where the water is extracted; bottled water could be enhanced with radionuclides. This study focuses on the activity concentrations of 210Po, 210Pb, 226Ra, 228Ra, 234U and 238U in bottled water available in the Swedish market, to assess the radiological impact to different age groups. The results showed that among the 26 brands studied, only three could exceed the threshold value for drinking water: 0.1 mSv/year. For two brands, the dose was mainly due to the activity concentrations of 238U and 234U being up to 714 and 1162 mBq/L, respectively. While for one brand, the dose was mainly due to the activity concentration of both 210Po and 210Pb being around 100 mBq/L. For the remainder brands, 228Ra was the main contributor to the committed effective dose.
2022-07-18T11:20:14Z
2022-07-18T11:20:14Z
2021-12
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135484
eng
Food Control, 130 (108302)
SSM2019-7847
https://reader.elsevier.com/reader/sd/pii/S0956713521004400?token=C120DB92927FF7017AADD2FA912CC69341F6CB66354F50BF4FC62B4A7D096185626B08A2B50C7A84609C2A4A2276798B&originRegion=eu-west-1&originCreation=20220718111347
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1559542024-03-08T07:00:20Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Polymer-based filaments with embedded magnetocaloric Ni-Mn-Ga Heusler alloy particles for additive manufacturing
Díaz García, Álvaro
Law, Jia Yan
Zrodowski, Łukasz
Moronczyk, Bartosz
Wróblewski, Rafał
Franco García, Victorino
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Física de la Materia Condensada
Universidad de Sevilla. FQM121: Sólidos no Cristalinos
Air Force Office of Scientific Research
Junta de Andalucía
Warsaw University of Technology
Additive manufacturing
Composite filaments
Magnetocaloric effect
One important issue associated to magnetocaloric materials that hinders its technological application is the poor processability and structural integrity of those with the highest performance, usually intermetallics undergoing first-order magnetic phase transitions. Additionally, the performance of these magnetocaloric materials highly depends on the structural stability of the magnetocaloric phase, which is, in many cases, very sensitive to temperature and mechanical processes. Additive manufacturing via the extrusion of polymer-based composites is regarded as a promising way to overcome these issues. A recently presented manufacturing method of encapsulating functional fillers into polymer capsules has been used to produce a composite filament with a large load of magnetocaloric off-stoichiometric Ni2MnGa Heusler alloy fillers with a uniform distribution throughout the polymer matrix as demonstrated by x-ray tomography characterization. The incorporation of these metallic particles causes changes in the thermal behavior of the polymer as well as an increase in the flowability of the composite with respect to the polymer at the same temperature. The increased flowability of the composites found during manufacturing can be compensated by lowering the extrusion temperatures, making this technique even more convenient for preserving the filler properties, which is an important concern when additive manufacturing magnetocaloric materials. This is confirmed by the magnetic and magnetocaloric behavior of the composites, with responses proportional to the fraction of fillers.
2024-03-08T07:00:20Z
2024-03-08T07:00:20Z
2024
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/155954
eng
Polymer Composites.
PID2019-105720RB-I00/AEI/10.13039/5011000110
FA8655-21-1-704
101101461
EMC21_00418
https://4spepublications.onlinelibrary.wiley.com/doi/epdf/10.1002/pc.28130
Atribución 4.0 Internacional
http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
Wiley
oai:idus.us.es:11441/1481312024-02-12T21:49:26Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Biodistribution of naturally occurring radionuclides and radiocesium in wild European perch (Perca fluviatilis)
Piñero García, Francisco
Thomas, R.
Mantero Cabrera, Juan
Forssell-Aronsson, Eva
Isaksson, Mats
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. RNM138: Física Nuclear Aplicada
Swedish Radiation Safety Authority
Swedish Museum of Natural History
Naturally occurring radionuclides (NORM)
Radiocesium
Bioaccumulation
Concentration Factor
Alpha Spectrometry
Radiation Risk
Wild European perch (Perca fluviatilis) is one of the most important freshwater fish species, in Sweden, due to its widespread and his value for recreational fishing. Little it is known regarding the biodistribution of naturally occurring radionuclides such as 238U, 234U, 226Ra, 210Po in perch. Therefore, in this study, perches from five lakes located in different counties in Sweden were collected to investigate the biodistribution of 238U, 234U, 226Ra, 210Po and 137Cs in organs and tissues of perch as well as their radiological impact. The results showed that uranium radionuclides ranged between 0.1 and 6 Bq/kg with an average value of 1.1 ± 1.5 Bq/kg. 226Ra varied from 0.4 to 8 Bq/kg with a mean concentration of 1.7 ± 1.9 Bq/kg. The ranged of 210Po was 0.5 – 250 Bq/kg, with an average value of 24 ± 52 Bq/kg. On the other hand, the highest activity concentration of 137Cs, 151 ± 1 Bq/kg, was detected in muscle samples of perch from Redsjösjön lake. For uranium radionuclides and 226Ra uptake from water is the main source whereas for 210Po and 137Cs the uptake is controlled by the perch diet. Regarding naturally occurring radionuclides, the perch tended to accumulated uranium radionuclides in fins, gills, and skin; 226Ra in bones, fins and skin and 210Po in the organs linked to digestive system. Finally, in case of consumption, it is advised the consumption of skinned fillets of perch due to the higher bioaccumulation of the radionuclides investigated in the skin and scales.
2023-07-20T10:53:54Z
2023-07-20T10:53:54Z
2023-07-15
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/148131
eng
Ecotoxicology and Environmental Safety, 260 (115085).
4.1–385-2021
https://www.sciencedirect.com/science/article/pii/S0147651323005894?via%3Dihub
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1533432024-02-14T09:13:47Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Quantum key distribution in the Holevo limit
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Universidad de Sevilla
Junta de Andalucía
Quantum key
Holevo limit
A theorem by Shannon and the Holevo theorem impose that the efficiency of any protocol for quantum key distribution, E , defined as the number of secret (i.e., allowing eavesdropping detection) bits per transmitted bit plus qubit, is E ≤ 1. The problem addressed here is whether the limit E = 1 can be achieved. It is showed that it can be done by splitting the secret bits between several qubits and forcing Eve to have only a sequential access to the qubits, as proposed by Goldenberg and Vaidman. A protocol with E = 1 based on polarized photons and in which Bob's state discrimination can be implemented with linear optical elements is presented.
2024-01-15T08:05:40Z
2024-01-15T08:05:40Z
2000-12-25
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/153343
eng
Physical Review Letters, 85 (26), 5635-5638.
OGICYT-191-97
FQM-239
https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.85.5635
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1464642024-02-14T19:08:22Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
A method for the determination of counting efficiencies in gamma-spectrometric measurements with HPGe detectors
Bolívar, Juan Pedro
García-Tenorio García-Balmaseda, Rafael
García León, Manuel
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Gamma-spectrometric
HPGe detectors
In this paper a general method for y-ray efficiency calibration is presented. The method takes into account the differences
of densities and counting geometry between the real sample and the calibration sample. It is based on the y-transmission
method and gives the correction factorf as a function of Ey, the density and counting geometry. Altough developed for soil
samples, its underlying working philosophy is useful for any sample whose geometry can be adequately reproduced.
2023-05-19T14:35:02Z
2023-05-19T14:35:02Z
1996
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/146464
eng
Nuclear Instruments and Methods in Physics Research. Section A Accelerators Spectrometers Detectors and Associated Equipment, 382 (3), 495-502.
https://www.sciencedirect.com/science/article/pii/S0168900296007905
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1336602024-02-13T22:26:12Zcom_11441_10853com_11441_10802com_11441_10690com_11441_10908com_11441_10918col_11441_10854col_11441_10909col_11441_10919
Effect of clays and metal containers in retaining Sm3+ and ZrO2+ and the process of reversibility
El Mrabet, Said
Castro Arroyo, Miguel Ángel
Hurtado Bermúdez, Santiago José
Orta Cuevas, María del Mar
Pazos, M. Carolina
Villa Alfageme, María
Alba, María D.
Universidad de Sevilla. Departamento de Química Inorgánica
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Química Analítica
Dirección General de Investigación Científica y Técnica (DGICYT). España
Actinide
Clay minerals
Geological disposal
Metallic canister
Radionuclide waste
Sorption/desorption
Knowledge and understanding about radionuclides retention processes on the materials composing the engineered barrier (clay mineral and metallic container waste) are required to ensure the safety and the long-term performance of radioactive waste disposal. Therefore, the present study focuses on the competitiveness of clay and the metallic container in the process of adsorption/desorption of the radionuclides simulators of Am3+ and UO22+. For this purpose, a comparative study of the interaction of samarium (chosen as chemical analog for trivalent americium) and zirconyl (as simulator of uranyl and tetravalent actinides) with both FEBEX bentonite and metallic container, under subcritical conditions, was carried out. The results revealed that the AISI-316L steel container, chemical composition detailed in Table 1, immobilized the high-radioactive waste (HRW), even during the corrosion process. The ZrO2+ was irreversibly adsorbed on the minireactor surface. In the case of samarium SEM/EDX analysis revealed the formation of an insoluble phase of samarium silicate on the container surface. There was no evidence of samarium diffusion through the metallic container. Samarium remained adsorbed by the container also after desorption experiment with water. Therefore, steel canister is actively involved in the HRW immobilization.
ENRESA 0079000121
Dirección General de Investigación Científica y Técnica (DGICYT) CTQ2010-14874
2022-05-25T14:12:49Z
2022-05-25T14:12:49Z
2014
info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
https://idus.us.es/handle//11441/133660
eng
American Mineralogist, 99 (4), 696-703.
0079000121
CTQ2010-14874
https://doi.org/10.2138/am.2014.4665
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Walter de Gruyter
oai:idus.us.es:11441/997442024-02-17T17:16:03Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Characterization of source rocks and groundwater radioactivity at the Chihuahua valley
Rentería-Villalobos, Marusia
Montero Cabrera, María Elena
Reyes Cortés, Manuel
Herrera Peraza, E. F.
Rodríguez Pineda, A.
Manjón Collado, Guillermo
García-Tenorio García-Balmaseda, Rafael
Crespo, T.
Valenzuela Hernández, M.
Universidad de Sevilla. Departamento de Física Aplicada II
Radiactividad
Agua subterránea
Desequilibrio U-234/U-238
Espectrometría gamma
Espectrometría alfa
As part of a scientific research project about alpha radioactivity in groundwater for human consumption at the Chihuahua City, the charac-terization of rock sources of radioactivity around de Chihuahua valley was developed. The radioactivity of groundwater and sediments wasdetermined, too. The radioactivity of uranium- and thorium- series isotopes contained in rocks was obtained by high resolution gamma-rayspectroscopy. Some representative values are 50 Bq/kg for the mean value of Bi-214 activity, and 121.5 Bq/kg for the highest value at Westof the city. The activity of sediments, extracted during wells perforation, was determined using a NaI(Tl) detector. A non-reported beforeuranium ore was localized at the San Marcos range formation. Its outcrops are inside the Chihuahua-Sacramento valley basin and its activ-ity characterization was performed. Unusually high specific uranium activities, determined by alpha spectrometry, were obtained in water,plants, sediments and fish extracted at locations close to outcrops of uranium minerals. The activity of water of the San Marcos dam reached7.7 Bq/L. The activity of fish, trapped at San Marcos dam, is 0.99 Bq/kg. Conclusions about the contamination of groundwater at North ofChihuahua City were obtained.
Como parte de un proyecto cient ́ıfico sobre actividad alfa en agua subterr ́anea de consumo humano en la ciudad de Chihuahua, se hadesarrollado la caracterizaci ́on de las rocas fuentes de la radiactividad en el valle de Chihuahua. Se determin ́o tambi ́en la actividad de muestrasde agua subterr ́anea y de sedimentos. La actividad de los is ́otopos de las series radiactivas en las rocas se obtuvo usando espectroscop ́ıagamma de alta resoluci ́on. Algunos valores representativos son 50 Bq/kg para el valor medio de la actividad del Bi-214 y 121.5 Bq/kg para elvalor m ́as alto al oeste de la ciudad. La actividad de los sedimentos extra ́ıdos durante la perforaci ́on de pozos para agua potable, se determin ́ousando un detector de NaI(Tl). En la formaci ́on monta ̃nosa de San Marcos se localiz ́o un dep ́osito de uranio no publicado. Sus afloramientosse encuentran dentro de la cuenca del valle Chihuahua-Sacramento y se realiz ́o la caracterizaci ́on de su radiactividad. Se determinaronactividades por espectrometr ́ıa alfa de agua, plantas, sedimentos y peces extra ́ıdos en emplazamientos cercanos a los afloramientos deminerales de uranio. La actividad del agua en la presa de san Marcos lleg ́o a 7.7 Bq/L. La actividad de pescados de la misma presa alcanza0.99 Bq/kg. Se obtuvieron conclusiones sobre la contaminaci ́on del agua subterr ́anea al norte de la ciudad de Chihuahua.
2020-07-22T12:17:46Z
2020-07-22T12:17:46Z
2007
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/99744
eng
http://www.scielo.org.mx/pdf/rmf/v53s3/v53s3a6.pdf
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Sociedad Mexicana de Física
oai:idus.us.es:11441/1359632024-02-13T09:21:06Zcom_11441_10853com_11441_10802com_11441_10690com_11441_10893col_11441_10854col_11441_10894
Quantum social networks
Cabello Quintero, Adán
Danielsen, Lars Eirik
López Tarrida, Antonio José
Portillo Fernández, José Ramón
Universidad de Sevilla. Departamento de Matemática Aplicada I (ETSII)
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM-239: Fundamentos de Mecánica Cuántica
Universidad de Sevilla. FQM-164: Matemática Discreta: Teoría de Grafos y Geometría Computacional
Ministerio de Ciencia e Innovación (MICIN). España
Ministerio de Educación y Ciencia (MEC). España
Ministerio de Economía y Competitividad (MINECO). España
Junta de Andalucía
We introduce a physical approach to social networks (SNs) in which each
actor is characterized by a yes–no test on a physical system. This allows us to
consider SNs beyond those originated by interactions based on pre-existing
properties, as in a classical SN (CSN). As an example of SNs beyond CSNs,
we introduce quantum SNs (QSNs) in which actor i is characterized by a test
of whether or not the system is in a quantum state |ψi . We show that QSNs
outperform CSNs for a certain task and some graphs. We identify the simplest
of these graphs and show that graphs in which QSNs outperform CSNs are
increasingly frequent as the number of vertices increases. We also discuss
more general SNs and identify the simplest graphs in which QSNs cannot be
outperformed.
Ministerio de Ciencia e Innovación FIS2008-05596
Ministerio de Educación y Ciencia MTM2008-05866
Ministerio de Economía y Competitividad FIS2011-29400
Junta de Andalucía P06-FQM-01649
2022-07-28T11:49:38Z
2022-07-28T11:49:38Z
2012
info:eu-repo/semantics/article
info:eu-repo/semantics/submittedVersion
https://idus.us.es/handle//11441/135963
eng
Journal of Physics A: Mathematical and Theoretical, 45 (28, art. nº 285101), 285101-1-285101-9.
FIS2008-05596
MTM2008-05866
FIS2011-29400
P06-FQM-01649
https://iopscience.iop.org/article/10.1088/1751-8113/45/28/285101
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
IOP Science
oai:idus.us.es:11441/1355242024-02-17T16:39:05Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Parametric analysis of the edge capacitance of uniform slots and application to frequency-variation permittivity sensors
Muñoz Enano, Jonathan
Martel Villagrán, Jesús
Vélez Rasero, Paris
Medina Mena, Francisco
Su, Lijuan
Martín Antolín, Ferran
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Universidad de Sevilla. TIC112: Microondas
Ministerio de Ciencia e Innovación (MICIN). España
Generalitat de Catalunya
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Microwave sensor
Permittivity sensor
Dielectric constant
Slot resonator
Magnetic wall
This paper presents a parametric analysis relative to the effects of the dielectric constant of the substrate, substrate thickness and slot width on the edge capacitance of a slot-based resonator. The interest is to find the conditions (ranges of the previously cited parameters) compatible with the presence of a quasi-magnetic wall in the plane of the slot (or plane of the metallization). If such magnetic wall is present (or roughly present), the electric field in the plane of the slot is tangential (or quasi-tangential) to it and the edge capacitance can be considered to be the parallel combination of the capacitances at both sides of the slot. Moreover, variations in one of such capacitances, e.g., caused by a change in the material on top of the slot, or by a modification of the dielectric constant of the substrate do not affect the opposite capacitance. Under the magnetic wall approximation, the capacitance of certain electrically small slot-based resonators can be easily linked to the dielectric constant of the material present on top of it. The consequence is that such resonators can be used as sensing elements in a permittivity sensor and the dielectric constant of the so-called material under test (MUT) can be determined from the measured resonance frequency and a simple analytical expression. In this paper, the results of this parametric analysis are validated by considering several sensing structures based on dumbbell defect ground structure (DB-DGS) resonators of different dimensions.
2022-07-19T08:14:12Z
2022-07-19T08:14:12Z
2021-07-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135524
eng
Applied Sciences, 11 (15(7000))
PID2019-103904RB-I00
2017SGR-1159
IJC2019-040786-I
https://www.mdpi.com/2076-3417/11/15/7000/pdf?version=1628126741
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
MDPI
oai:idus.us.es:11441/997742020-07-23T11:13:21Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854oai:idus.us.es:11441/1499392024-02-12T21:58:42Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Self-testing of a single quantum system from theory to experiment
Hu, Xiao-Min
Xie, Yi
Arora, Atul Singh
Ai, Ming-Zhong
Bharti, Kishor
Zhang, Jie
Wu, Wei
Chen, Ping Xing
Cui, Jin Ming
Liu, Bi-Heng
Huang, Yun-Feng
Li, Chuan-Feng
Guo, Guang-Can
Roland, Jérémie
Cabello Quintero, Adán
Kwek, Leong-Chuan
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
National Natural Science Foundation of China
Universidad de Sevilla
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Ministerio de Economia, Industria y Competitividad (MINECO). España
Ministerio de Ciencia, Innovación y Universidades (MICINN). España
Ministry of Education, Singapore
National Research Foundation Singapore
Department of Energy. United States
Institute for Quantum Information and Matter
Belgian Fonds pour la Formation à la Recherche
Single quantum system
Klyachko-Can-Binicioğlu-Shumovsky inequality
Self-testing allows one to characterise quantum systems under minimal assumptions. However, existing schemes rely on quantum nonlocality and cannot be applied to systems that are not entangled. Here, we introduce a robust method that achieves self-testing of individual systems by taking advantage of contextuality. The scheme is based on the simplest contextuality witness for the simplest contextual quantum system—the Klyachko-Can-Binicioğlu-Shumovsky inequality for the qutrit. We establish a lower bound on the fidelity of the state and the measurements as a function of the value of the witness under a pragmatic assumption on the measurements. We apply the method in an experiment on a single trapped 40Ca+ using randomly chosen measurements and perfect detection efficiency. Using the observed statistics, we obtain an experimental demonstration of self-testing of a single quantum system.
2023-10-30T07:07:21Z
2023-10-30T07:07:21Z
2023-10-19
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/149939
eng
npj Quantum Information, 9 (103).
2017YFA0304100
2021YFE0113100
11734015
11874345
11821404
11904357
12174367
11904402
12074433
12174447
12004430
12174448
2021ZD0301200
2021ZD0301605
2022RC1194
2008085J02
US15097
PCI2019-111885-2
PID2020-113738GB-I00
OMA-2120757
DE-SC0020312
DE-SC0019040
DE-SC0019449
GBMF1250002
FA9550-18-1-0161
1.E.081.17F
R.50.05.18.F
https://www.nature.com/articles/s41534-023-00769-7
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Nature Research
oai:idus.us.es:11441/486182024-02-14T20:38:28Zcom_11441_10848com_11441_10802com_11441_10690com_11441_10853col_11441_10849col_11441_10854
239Pu sorption by suspended matter from Hueznar reservoir (southern Spain): Experimental and modelling study
El Mrabet, Rachid
Barros Rojas, Haydn
Abril Hernández, José María
Manjón Collado, Guillermo
García-Tenorio García-Balmaseda, Rafael
Universidad de Sevilla. Departamento de Física Aplicada I
Universidad de Sevilla. Departamento de Física Aplicada II
ENRESA
Kinetic transfer coefficients are important parameters to understand and reliably model the behaviour of non-conservative radionuclides in aquatic environments. This report pertains to a series of radiotracer experiments on 239Pu uptake in natural unfiltered waters from the Hueznar reservoir (southern Spain). The experimental procedure ensures the preservation of environmental conditions and the dissolved Pu activity was measured by liquid scintillation technique. The data suggest that the main pathways for Pu uptake consist of two parallel and reversible reactions. We studied the effects of suspended matter concentrations and the specific surface area on the kinetic transfer coefficients.
ENRESA
2016-11-15T11:33:58Z
2016-11-15T11:33:58Z
2005
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle/11441/48618
eng
Radioprotection. Revue de la Société Française de radioprotection, 40 (Supl. 1), S343-S349.
http://dx.doi.org/10.1051/radiopro:2005s1-051
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
E. D. P. Sciences
oai:idus.us.es:11441/999142020-07-28T14:31:32Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Characterization of terrestrial hot particles from the Palomares accident using destructive and non-destructive analytical techniques
Jiménez Ramos, María del Carmen
García López, J
García-Tenorio García-Balmaseda, Rafael
García León, M.
Universidad de Sevilla. Departamento de Física Aplicada II
Several radioactive particles from the Palomares area have been analyzed with the nuclearmicroprobe of the National Accelerator Centre (CNA) in Seville exploring the advantages of combining -PIXE using a 5.5 MeV4He beam with conventional -PIXE analysis using 3 MeV protons. Themeasurements performed with the -particles are more sensitive to the sample surface, while the resultscollected with protons are indicative of the average composition of the hot particle. In this way, importantinformation about the depth distribution of Pu and U in the particles has been obtained. In addition, theparticles have been analyzed by SEM (EDX) and one of them has been sacrificed for the determinationof its U and Pu isotopic composition by ICP-MS and -spectrometry, being gained in this way importantinformation about the composition of the weapons involved in the Palomares accident.
Junta de Andalucía Excellence Project TU-DRAMA (Ultra-sensitive techniques for radionuclides determination in environmental materials)
2020-07-28T14:31:32Z
2020-07-28T14:31:32Z
2009
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/99914
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
EDP Sciences
oai:idus.us.es:11441/1554082024-02-21T08:56:44Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Loophole-free Bell tests with randomly chosen subsets of measurement settings
Singh, Jaskaran
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Ciencia, Innovación y Universidades (MICINN). España
Agencia Estatal de Investigación. España
Loophole-free Bell tests
Quantum nonlocal correlations
There are bipartite quantum nonlocal correlations requiring very low detection efficiency to reach the loophole-free regime but that need too many measurement settings to be practical for actual experiments. This leads to the general problem of what can be concluded about loophole-free Bell nonlocality if only a random subset of these settings is tested. Here we develop a method to address this problem. We show that, in some cases, it is possible to detect loophole-free Bell nonlocality by testing only a small random fraction of the settings. The consequence is a higher detection efficiency. The method allows for the design of loophole-free Bell tests in which, given a quantum correlation that violates a Bell inequality, one can calculate the minimum fraction of contexts needed to reach the detection-loophole-free regime. The results also enforce a different way of thinking about how local realistic models or classical communication can be used to simulate quantum nonlocal correlations, as it shows that the amount of resources that are needed can be made arbitrarily large simply by considering more contexts.
2024-02-21T08:56:44Z
2024-02-21T08:56:44Z
2024-02-06
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/155408
eng
731473
101017733
PCI2019-111885-2
101070558
PID2020-113738GB-I00
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.109.022204
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1532022024-02-17T17:15:12Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
El puzle de la teoría cuántica. ¿Es posible zanjar científicamente el debate sobre la naturaleza del mundo cuántico?
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Mecánica cuántica
Teoría cuántica
Probabilidades
La mecánica cuántica choca con algunas de nuestras intuiciones más arraigadas acerca del mundo físico. A lo largo de la historia, esa situación ha generado un continuo debate acerca de su significado. Un enfoque tradicional se ha basado en cuestionar el carácter intrínsecamente probabilístico de la teoría. Otros han defendido la necesidad de corregir sus ecuaciones fundamentales para incorporar el proceso de medición. Una tercera opción consiste en aceptar la teoría cuántica tal y como es y preguntarse sobre su origen: ¿cómo debería ser un universo para que la teoría cuántica constituya la herramienta predictiva más eficaz? La respuesta podría apuntar a un aspecto clave de la realidad física: el universo tal vez carezca de leyes que determinen las probabilidades de obtener un resultado u otro en un experimento.
2024-01-11T08:25:09Z
2024-01-11T08:25:09Z
2017
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/153202
spa
Investigación y ciencia, 492, 56-61.
http://edifisica.us.es/Adan/Carpetas/Publications/O04%20IC492(17-09)0008.pdf
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Prensa Científica
oai:idus.us.es:11441/1310962022-03-21T16:48:00Zcom_11441_10853com_11441_10802com_11441_10690com_11441_10863col_11441_10854col_11441_10864
Study of Ionization Charge Density-Induced Gain Suppression in LGADs
Jiménez Ramos, María del Carmen
García López, Francisco Javier
García Osuna, Adrián
Vila, Iván
Currás, Esteban
Jaramillo, Richard
Hidalgo, Salvador
Pellegrini, Giulio
Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Universidad de Sevilla. Departamento de Física Aplicada II
Bragg peak
Gain suppression
IBIC
LGAD
Microplasma generation
TRIBIC
Gain suppression induced by excess carriers in Low Gain Avalanche Detectors (LGADs) has been investigated using 3 MeV protons in a nuclear microprobe. In order to modify the ionization density inside the detector, Ion Beam Induced Current (IBIC) measurements were performed at different proton beam incidence angles between 0◦ and 85◦. The experimental results have been analyzed as a function of the ionization density projected on the multiplication layer, finding that the increase of ionization density leads to greater gain suppression. For bias voltages close to the gain onset value, this decrease in gain results into a significant distortion of the transient current waveforms measured by the Time-Resolved IBIC (TRIBIC) technique due to a deficit in the secondary holes component. For angles of incidence such that the Bragg peak falls within the sensitive volume of the detector, the formation of microplasmas modifies the behavior of the gain curves, producing an abrupt decrease in gain as the angle increases.
Ministerio de Ciencia, Innovación y Universidades RTI2018-098117-B-C21, 10.13039/501100011033, ICTS-2020-02-US-4
Junta de Andalucía US-1380791
European Union FPA2017-85155-C4-1-R, FPA2017-85155-C4-2-R
2022-03-21T16:48:00Z
2022-03-21T16:48:00Z
2022
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/131096
eng
Sensors, 22 (3), 1080.
RTI2018-098117-B-C21
10.13039/501100011033
ICTS-2020-02-US-4
US-1380791
FPA2017-85155-C4-1-R
FPA2017-85155-C4-2-R
https://doi.org/10.3390/s22031080
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Multidisciplinary Digital Publishing Institute (MDPI)
oai:idus.us.es:11441/1517952024-02-14T13:52:13Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
3D information-theoretic analysis of the simplest hydrogen abstraction reaction
Esquivel Olea, Rodolfo Octavio
Molina Espíritu, Moyocoyani
López Rosa, Sheila
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Economia, Industria y Competitividad (MINECO). España
Junta de Andalucía
Universidad de Granada
Information theory
3D space
Complexity measures
We investigate the course of an elementary chemical reaction from the perspective of information theory in 3D space through the hypersurface of several information-theoretic (IT) functionals such as disequilibrium (D), Shannon entropy (S), Fisher information (I), and the complexity measures of Fisher-Shannon (FS) and López-Mancini-Calbet (LMC). The probe for the study is the hydrogenic identity abstraction reaction. In order to perform the analysis, the reactivity pattern of the reaction is examined by use of the aforementioned functionals of the single-particle density, which is analyzed in position (r) and momentum (p) spaces. The 3D analyses revealed interesting reactivity patterns in the neighborhood of the intrinsic reaction coordinate (IRC) path, which allow to interpret the reaction mechanism for this reaction in a novel manner. In addition, the chemically interesting regions that have been characterized through the information functionals and their complexity measures are depicted and analyzed in the framework of the three-dimensional structure of the information-theoretical data of a chemical reaction, that is, the reactant/product (R/P) complexes, the transition state (TS), and the ones that are only revealed through IT measures such as the bond-cleavage energy region (BCER), the bond-breaking/forming (B-B/F) region, and the spin-coupling (SC) process. Furthermore, focus has been placed on the diagonal part of the hypersurface of the IT functionals, aside from the IRC path itself, with the purpose of analyzing the dissociation process of the triatomic transition-state complex that has revealed other interesting features of the bond-breaking (B-B) process. In other respects, it is shown throughout the combined analyses of the 3D structure of the IT functionals in conjugated spaces that the chemically significant regions occurring at the onset of the TS are completely characterized by information-theoretic aspects of localizability (S), uniformity (D), and disorder. Further, novel regions of low complexity seem to indicate new boundaries for chemically stable complex molecules. Finally, the study reveals that the chemical reaction occurs at low-complexity regions, where the concurrent phenomena take place: bond-breaking/forming (B-B/F), bond-cleavage energy reservoirs (BCER), spin-coupling (SC), and transition state (TS).
2023-11-29T08:13:39Z
2023-11-29T08:13:39Z
2023-07-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/151795
eng
The Journal of Physical Chemistry A, 127 (30), 6159-6174.
PID2020-113390GB-I00
PY20_00082
A-FQM-52-UGR20
FQM-207
FQM-239
https://pubs.acs.org/doi/epdf/10.1021/acs.jpca.3c01957
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Chemical Society
oai:idus.us.es:11441/269182024-02-14T20:06:38Zcom_11441_10838com_11441_10802com_11441_10690com_11441_10853col_11441_10839col_11441_10854
Electromechanics of fluidized beds of nanoparticles
Espín Milla, Manuel Jesús
Valverde Millán, José Manuel
Sánchez Quintanilla, Miguel Angel
Castellanos Mata, Antonio
Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo
Universidad de Sevilla. Departamento de Física Aplicada II
The electromechanical behavior of a gas-fluidized bed of insulating silica nanoparticles is investigated. When fluidized by gas, these nanoparticles form highly porous agglomerates of size of the order of hundreds of microns, which gives rise to a nonbubbling fluidization regime. Bed expansion is enhanced by an imposed alternating electric field for oscillation frequencies in the range between tens and hundreds of hertzs and field strengths of about 1 kVcm. Nanoparticle agglomerates are naturally charged and experience forced oscillations that cause an increase of the gas flow shear on their surface. As a consequence, the agglomerate size is expected to decrease, which can explain the observed behavior. A model based on the balance between attractive and flow shear forces is presented that accounts for agglomerate size reduction as the strength of the field is increased.
2015-07-16T10:18:05Z
2015-07-16T10:18:05Z
2009
info:eu-repo/semantics/article
https://idus.us.es/handle/11441/26918
eng
Physical review E. Statistical, nonlinear, and soft matter physics, 79, 1, 011304-1-011304-7
http://dx.doi.org/10.1103/PhysRevE.79.011304
http://dx.doi.org/10.1103/PhysRevE.79.011304
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1530482024-02-13T09:59:01Zcom_11441_11306com_11441_11290com_11441_10690com_11441_24700com_11441_10853com_11441_10802col_11441_11307col_11441_24701col_11441_10854
Valorization of phosphogypsum in cement-based materials: limits and potential in eco-efficient construction
Da Silva Calderón-Morales, Bianca Rafaela
García Martínez, Antonio
Pineda Palomo, Paloma
García-Tenorio García-Balmaseda, Rafael
Universidad de Sevilla. Departamento de Construcciones Arquitectónicas I (ETSA)
Universidad de Sevilla. Departamento de Estructuras de Edificación e Ingeniería del Terreno
Universidad de Sevilla. Departamento de Física Aplicada II
Phosphogypsum
Eco-efficient cement-based materials
Cementitious systems
Valorization
Green building materials
Eco-friendly cement
Phosphogypsum (PG) is a type of synthetic gypsum generated during the production of phosphoric acid. Each ton of phosphoric acid generates 5 tons of phosphogypsum. This industrial process has caused significant environmental problems worldwide. After an extensive literature review, it was possible to verify that both sedimentary and igneous PG can be used as in materials building components. The use of PG up to 50% meets the limits required for index I, with a radioactivity equivalent to radio-226 and a concentration of radon-222. The data found on bricks (0,11-0,41 Bq m-2 h-1) and plate (0,16-0,41 Bq m-2 h -1) show a lower exhalation rate. It is also found that calcination contributes to the reduction of PG impurities and to the of mechanical strength increase. Mortars and concretes produced with PG-based cementitious systems cementitious systems based on PG achieve high strength (60 MPa, 70 MPa, 80 MPa) and meet the technical feasibility criteria of European standards EN 998-1, EN 998-2, EN 13813, Eurocode 1992 and the American standard ASTM C270. The setting time is influenced by the mineral phase of the PG. It is concluded that cementitious materials produced from phosphogypsum are technically viable and achieve a satisfactory performance. It is possible to advance the following lines: PG-based concrete with high performance, PG-based hydration cement, stabilized mortar, PG-based concrete with high workability and studies about chloride ingress, carbonation, sulfate attack and acid attack in PG-based concrete.
2024-01-09T08:28:17Z
2024-01-09T08:28:17Z
2021-12
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/153048
eng
Journal of Building Engineering, 44 (102506).
https://www.sciencedirect.com/science/article/pii/S2352710221003636?via%3Dihub
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1074992024-02-13T22:02:01Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Experimental implementation of a Kochen-Specker Set of Quantum Tests
Cabello Quintero, Adán
D’Ambrosio, Vicenzo
Herbauts, Isabelle
Amselem, Elias
Nagali,, Eleanora
Bourennane, Mohamed
Sciarrino, Fabio
Universidad de Sevilla. Departamento de Física Aplicada II
Optics
Quantum Physics
Quantum information
Kochen-Specker Set
Quantum Tests
The conflict between classical and quantum physics can be identified through a series of yes-no tests onquantum systems, without it being necessary that these systems be in special quantum states. Kochen-Specker (KS) sets of yes-no tests have this property and provide a quantum-versus-classical advantage thatis free of the initialization problem that affects some quantum computers. Here, we report the firstexperimental implementation of a complete KS set that consists of 18 yes-no tests on four-dimensionalquantum systems and show how to use the KS set to obtain a state-independent quantum advantage. Wefirst demonstrate the unique power of this KS set for solving a task while avoiding the problem of stateinitialization. Such a demonstration is done by showing that, for 28 different quantum states encoded inthe orbital-angular-momentum and polarization degrees of freedom of single photons, the KS set providesan impossible-to-beat solution. In a second experiment, we generate maximally contextual quantumcorrelations by performing compatible sequential measurements of the polarization and path of singlephotons. In this case, state independence is demonstrated for 15 different initial states. Maximumcontextuality and state independence follow from the fact that the sequences of measurements projectany initial quantum state onto one of the KS set’s eigenstates. Our results show that KS sets can be usedfor quantum-information processing and quantum computation and pave the way for future developments.
2021-04-20T17:25:35Z
2021-04-20T17:25:35Z
2013
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/107499
eng
null
https://doi.org/10.1103/PhysRevX.3.011012
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1357182024-02-14T20:20:39Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Mutual information in conjugate spaces for neutral atoms and ions
Angulo Ibáñez, Juan Carlos
López Rosa, Sheila
Universidad de Sevilla. Departamento de Física Aplicada II
Mutual information
Quantum similarity index
Electron correlation
Multielectronic systems
The discrepancy among one-electron and two-electron densities for diverseN-electronatomss, enclosing neutral systems (with nuclear chargeZ=N) and charge-one ions (|N−Z|=1), isquantified by means of mutual information,I, and Quantum Similarity Index,QSI, in the conjugatespaces position/momentum. These differences can be interpreted as a measure of the electroncorrelation of the system. The analysis is carried out by considering systems with a nuclear chargeup toZ=103and singly charged ions (cations and anions) as far asN=54. The interelectroniccorrelation, for any given system, is quantified through the comparison of its double-variable electronpair density and the product of the respective one-particle densities. An in-depth study along thePeriodic Table reveals the importance, far beyond the weight of the systems considered, of theirshell structure.
2022-07-22T09:42:16Z
2022-07-22T09:42:16Z
2022
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135718
eng
Entropy, 24 (2), 1-23.
https://doi.org/10.3390/e24020233
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
MDPI
oai:idus.us.es:11441/1357432024-02-14T08:57:29Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Natural radioactivity and element characterization in pit lakes in Northern Sweden
Rimon, Thomas
Mantero Cabrera, Juan
Ruiz Cánovas, Carlos
Holm, Elis
García-Tenorio García-Balmaseda, Rafael
Forssell-Aronsson, Eva
Isaksson, Mats
Universidad de Sevilla. Departamento de Física Aplicada II
Lakes
Surface water
Water quality
Natural radioactivity
Northern Sweden
Chemical elements
Northern Sweden has been the object of intense metal mining in the last decades producing several water-filled open-pits, or pit lakes. Most of these pit lakes have been limed to maintain a good water quality and to prevent generation of acidic water that could leach the exposed rocks and release metals into water. The aim of this work was to examine the concentration of stable elements and naturally occurring radionuclides in water and sediment samples from pit lakes originating from non-uranium mining activities in Northern Sweden. Surface water and surface sediments were collected from 27 pit lakes in Northern Sweden. Water quality parameters, concentration of stable elements and radionuclides were measured by a water probe, ICP-MS and XRF, and alpha and gamma spectrometry, respectively. Furthermore, a multivariate statistical analysis (PCA) was performed on the water samples and sediments. In general, the quality of the surface water was good, but some lakes had low pH values (2.5–5.7), and high concentrations of Fe (up to 200 mg/L) and other metals (e.g. Zn, Cu). When relating the metal concentrations in sediments in pit lakes with the concentration found in natural lakes, some sites had relatively high levels of Cu, As, Cr and Pb. The activity concentration of 210Po, and U and Th isotopes in water and sediment samples were at environmental levels, as was the ambient dose equivalent rate at these sites (range 0.08–0.14 μSv/h).
2022-07-25T08:34:52Z
2022-07-25T08:34:52Z
2022
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135743
eng
PLoS ONE, 17 (3), 1-17.
https://doi.org/10.1371/journal.pone.0266002
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Plos
oai:idus.us.es:11441/1355742024-02-17T17:17:04Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
The enhanced naturally occurring radioactivity of negative ion clothing and attendant risk
Hassan, Halmat Jalal
Hashim, Suhairul
Abu Hanifah, Noor Zati Hani
Hadi, Muhammad Fahmi Rizal Abdul
Sanusi, Mohamad Syazwan Mohd
Bradley, David Andrew
García-Tenorio García-Balmaseda, Rafael
Tahar, Rozman Mohd
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. RNM138: Física Nuclear Aplicada
Consumer products
Undergarment
Geant4 Monte Carlo simulation
Regulations
The study investigates commercially available negative ion clothing, and evaluations are made using gamma-ray spectroscopy and Geant4 Monte Carlo simulations. Observed to contain naturally occurring radioactive material (NORM), evaluations are made of the radiological risk arising from the use of these as items of everyday wear, undergarments in particular. Organ doses from these were simulated using the MIRD5 mathematical female phantom, with the incorporation of dose conversion factors (DCFs). At 175 ± 26, 1732 ± 247, and 207 ± 38 Bq, for 238U, 232Th, and 40K respectively, item code S05 was found to possess the greatest activity, while item code S07 was shown to have the least activity, at 2 ± 0.5 and 15 ± 2 Bq, and again for 238U and 232Th, respectively. Sample code S11 recorded least activity, at 29 ± 5 Bq, for 40K. Among the clothing items, sample item code S05 offered the greatest concentrations of Th, U and Zr, with percentage means of 1.23 ± 0.1, 0.045 ± 0.001, and 1.29 ± 0.1, respectively, giving rise to an annual effective dose of 1.57 mSv/y assuming a nominal wearing period of 24 h per day. Accordingly, the annual public dose limit of 1 mSv can be exceeded by their use.
2022-07-19T11:45:20Z
2022-07-19T11:45:20Z
2021-06-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135574
eng
R.J130000.7317.4B658
R.J130000.7317.4B659
https://www.mdpi.com/2076-3417/11/12/5412/pdf?version=1623327773
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
MDPI
oai:idus.us.es:11441/985362024-02-12T21:59:53Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Probing the limits of correlations in an indivisible quantum system
Malinowski, Maciej
Zhang, Chi
Leupold, Florian
Cabello Quintero, Adán
Alonso, J
Home, Jonathan
Universidad de Sevilla. Departamento de Física Aplicada II
Swiss National Science Foundation
Office of the Director of National Intelligence
Intelligence Advanced Research Projects Activity
U.S. Army Research Office
We employ a trapped ion to study quantum contextual correlations in a single qutrit using the 5-observable Klyachko,Can,Binicio˘glu,andShumovskyinequality,whichisarguablythemostfundamentalnoncontextuality inequality for testing quantum mechanics (QM). We quantify the effect of systematics in our experiment by purposely scanning the degree of signaling between measurements, which allows us to place realistic bounds on the nonclassicality of the observed correlations. Our results violate the classical bound for this experiment by up to 25 standard deviations, while being in agreement with the QM limit. In order to test the prediction of QM that the contextual fraction increases with the number of observables, we gradually increase the complexity of our measurements from 5 up to 121 observables. We find stronger-than-classical correlations in all prepared scenarios up to 101 observables, beyond which experimental imperfections blur the quantum-classical divide.
2020-06-30T13:37:53Z
2020-06-30T13:37:53Z
2018-11
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/98536
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
APS Publications
oai:idus.us.es:11441/1357192024-02-14T11:25:31Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Ruling out real-valued standard formalism of quantum theory
Chen, Ming Cheng
Wang, Can
Liu, Feng Ming
Wang, Jian Wen
Ying, Chong
Shang, Zhong
Shang, Zhong Xia
Wu, Yulin
Gong, M.
Deng, H.
Liang, F. T.
Zhang, Qiang
Peng, Cheng Zhi
Zhu, Xiaobo
Cabello Quintero, Adán
Lu, Chao Yang
Pan, Jian Wei
Universidad de Sevilla. Departamento de Física Aplicada II
Quantum theory
Quantum entanglement
Quantum networks
2022-07-22T10:00:38Z
2022-07-22T10:00:38Z
2022
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135719
eng
Physical review letters, 128 (4), 1-5.
https://doi.org/10.1103/PhysRevLett.128.040403
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1534052024-01-15T17:15:23Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
A simplified formulation of wire-plate corona discharge in air: application to the ion wind simulation
Bouazza, Mohamed Ridha
Yanallah, Khelifa
Pontiga Romero, Francisco de Paula
Chen, J.
Universidad de Sevilla. Departamento de Física Aplicada II
Corona discharge
Electric wind
Semi-analytical approach
Wire-to-plane electrode geometry
Fluid model
The spatial distribution of charged particles (electrons, negative ions and positive ions) and electric
field have been evaluated using a semi-analytical approach of the positive and negative corona
discharge for a wire-to-plate electrode system. Thus, approximate formulas useful for the
characterization and control of corona discharge devices are provided, which helps to significantly
reduce computational costs. Based on the obtained results, the electro-hydrodynamic (EHD) force
generated by the corona discharge has been determined, and it has been used in the Navier-Stokes
equations to compute the spatial distribution of the gas velocity. As a result, the influence of the
corona plasma region in the flow pattern, particularly in the vicinity of the corona electrode, has been
brought to light, which helps to understand the different flow velocities observed in positive and
negative coronas. Moreover, the influence of voltage, wire radius, and inter-electrode separation on the
electric wind velocity has been investigated.
2024-01-15T17:15:23Z
2024-01-15T17:15:23Z
2018
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/153405
eng
Journal of Electrostatics, 92, 54-65.
https://doi.org/10.1016/j.elstat.2018.02.001
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1533512024-01-15T08:50:33Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Violating bell's inequality beyond Cirel'son's bound
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Junta de Andalucía
Ministerio de Ciencia y Tecnología (MCYT). España
Cirel’son inequality
Clauser-Horne-Shimony-Holt (CHSH) inequality
Bell's inequality
Cirel’son inequality states that the absolute value of the combination of quantum correlations appearing in the Clauser-Horne-Shimony-Holt (CHSH) inequality is bound by 2 √ 2. It is shown that the correlations of two qubits belonging to a three-qubit system can violate the CHSH inequality beyond 2 √ 2. Such a violation is not in conflict with Cirel’son’s inequality because it is based on postselected systems. The maximum allowed violation of the CHSH inequality, 4, can be achieved using a Greenberger-Horne-Zeilinger state.
2024-01-15T08:50:32Z
2024-01-15T08:50:32Z
2002-02-11
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/153351
eng
Physical Review Letters, 88 (6), 060403-1-060403-4.
FQM-239
BFM2000-0529
BFM2001-3943
https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.88.060403
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1470052024-02-14T13:43:30Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Chiral Majorana interference as a source of quantum entanglement
Chirolli, Luca
Baltanás, José P.
Frustaglia, Diego César
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
European Union (UE)
Comunidad de Madrid
Ministerio de Economía y Competitividad (MINECO). España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Hanbury Brown-Twiss interferometry
Chiral Majorana modes
Two-particle interferometry
Two-particle Hanbury Brown-Twiss interferometry with chiral Majorana modes produces maximally entangled electron-hole pairs. We promote the electron-hole quantum number to an interferometric degree of freedom and complete the set of linear tools for single- and two-particle interferometry by introducing a key phase gate that, combined with a Mach-Zehnder, allows full electron-hole rotations. By considering entanglement witnesses built on current cross-correlation measurements, we find that the possibility of independent local-channel rotations in the electron-hole subspace leads to a significant boost of the entanglement detection power.
2023-06-07T10:34:02Z
2023-06-07T10:34:02Z
2018
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/147005
eng
Physical Review B, 97 (155416).
FP7/2007-2013
290846
MAD2D-CM
FIS2014-53385-P
FIS2017- 86478-P
https://journals.aps.org/prb/pdf/10.1103/PhysRevB.97.155416
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/995692024-02-14T20:26:38Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Exploring the acoustics of ancient open-air theatres
Girón Borrero, Sara
Alvarez-Corbacho, Ángel
Zamarreño García, Teófilo
Universidad de Sevilla. Departamento de Física Aplicada II
Acoustics of theatres
Classical theatre acoustics
Open-air theatre
Heritage acoustics
The theatres of Antiquity, Greek and Roman, constitute public buildings of the utmost importance inthe history of Western culture and in universal cultural heritage. Many of these spaces are being used fortheir original function with or without only minor adaptations. If they are well preserved and/or restored,these performance buildings attract large audiences to representations of classical and contemporary plays,thereby serving the purpose for which they were built in the Ancient Age. These theatres bear witnessto the existing relationship between architectural work, visual and acoustic experience, and dramatic art.Although the majority are located in the Mediterranean region, these structures were also built in themajor cities of the ancient world in Europe, the Middle East, northern Africa, and beyond. This paper aimsto summarise and critically review research published in the literature regarding their acoustic aspects,with particular emphasis on Roman theatres. These pieces of research emphasize the importance of thediffraction of sound in the tiers of thecaveaand the good intelligibility for speech of the Greco-Romantheatre.
2020-07-16T15:13:18Z
2020-07-16T15:13:18Z
2020
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/99569
eng
https://doi.org/10.24425/aoa.2020.132494
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
De Gruyter Open
oai:idus.us.es:11441/1531162024-02-13T20:27:30Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Proposed experiment for the quantum "Guess My Number" protocol
Cabello Quintero, Adán
López Tarrida, Antonio José
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Ciencia y Tecnología (MCYT). España
Junta de Andalucía
Guess my number
Quantum protocol
An experimental realization of the entanglement-assisted “Guess My Number” protocol for the reduction of communication complexity, introduced by Steane and van Dam, would require producing and detecting three-qubit GHZ states with an efficiency
η > 0.70, which would require single photon detectors of efficiency σ > 0.89. We propose a modification of the protocol which can be translated into a real experiment using present-day technology. In the proposed experiment, the quantum reduction of the multiparty communication complexity would require an efficiency η > 0.05, achievable with detectors of σ > 0.47, for four parties, and η > 0.17 (σ > 0.55) for three parties.
2024-01-10T07:02:02Z
2024-01-10T07:02:02Z
2005
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/153116
eng
Physical Review A (atomic, molecular, and optical physics and quantum information), 71 (020301(R)).
BFM2002-02815
FQM-239
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.71.020301
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1441582024-02-12T21:35:31Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
226Ra, 210Po and lead isotopes in a pit lake water profile in Sweden
Thomas, R.
Mantero Cabrera, Juan
Pérez Moreno, Silvia María
Ruiz Cánovas, Carlos
Vioque Romero, Ignacio
Isaksson, M.
Forssell-Aronsson, E.
Holm, E.
García-Tenorio García-Balmaseda, Rafael
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. RNM138: Física Nuclear Aplicada
Swedish Radiation Safety Authority
Pit lake
NORM
Radium
Polonium
Lead
Water column profile
A pit lake arises as a consequence of anthropogenic activities in opencast mining areas. These water bodies may
be enriched in hazardous stable contaminants and/or in naturally occurring radionuclides depending on the local
geological conditions. Mining legacy in Sweden produced hundreds of these pit lakes and most of them are used
for recreational purposes in the southern part of the country. In this paper, one pit lake was selected for having
enhanced levels of natural radionuclides. Physico-chemical parameters (temperature, pH, oxidation-reduction
potential, dissolved oxygen and depth), elemental composition (via Inductive Coupled Plasma Mass Spectrometry) and radiometric characterization (via alpha spectrometry of 226Ra, 210Po and 210Pb) were carried along the
depth of a 60 m depth pit lake, with the main aim to describe how natural radionuclides and elements behaves
with depth in a non-uraniferous pit lake.
Based on observed changes in physico-chemical parameters, a thermocline and a chemocline region were
identified at around 10 and 30 m depth respectively. Concerning radionuclides, 226Ra ranged from 75 ± 3 up to
360 ± 12 mBq/kg while 210Po ranged from 11 ± 1 up to 71 ± 3 mBq/kg. 210Pb distribution with depth was also
determined via secular equilibrium with 210Po after 2 years and also stable Pb was measured. Disequilibrium 226Ra-210Pb was found and the residence time of 210Pb in the water column was assessed. Additionally, different
vertical distributions between 210Pb and Pb were found which points out different sources for different lead
isotopes in the water body.
2023-04-11T10:52:21Z
2023-04-11T10:52:21Z
2020-11
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/144158
eng
Journal of Environmental Radioactivity, 223-224 (106384).
https://www.sciencedirect.com/science/article/pii/S0265931X19308690?via%3Dihub
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/997512024-02-14T19:38:13Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
The use of 137-cs in marine and lacustrine sediment dating
Sánchez, C. I.
García-Tenorio García-Balmaseda, Rafael
García León, Manuel
Abril, J. M.
El-Daoushy, F.
Universidad de Sevilla. Departamento de Física Aplicada II
En este trabajo, la técnica de datación 137 Cs con precisión mejorada se muestra como una herramienta poderosa para establecer cronologías en diferentes depósitos acuáticos jóvenes (lacustres, marinos). El método tiene especial importancia cuando el método de 210 Pb da resultados parciales o poco claros
2020-07-22T12:54:50Z
2020-07-22T12:54:50Z
1992
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/99751
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Pergamon Press
oai:idus.us.es:11441/1464772024-02-14T19:28:20Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
A three-dimensional model for the dispersion of radioactive substances in marine ecosystems: application to the Baltic Sea after the Chernobyl disaster
Toscano Jiménez, Manuel
García-Tenorio García-Balmaseda, Rafael
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Física Aplicada III
3-D model
Diffusion scales
137Cs
Chernobyl
Baltic Sea
A 3-D dispersion model has been developed to simulate the dispersion of nuclear contaminants in marine ecosystems. This model is characterized by presenting high spatial resolution, by taking into account the possible sedimentation of a fraction of the contaminants, and by formulating the diffusion processes using an original approach.
The model has been applied and validated taking the Baltic Sea as its scenario, and using the 137Cs originating from the Chernobyl accident as the substance which experienced the dispersion. The simulation of a year’s dispersion of the 137Cs in the Baltic sea (just after the Chernobyl accident) has been performed.
2023-05-19T18:37:00Z
2023-05-19T18:37:00Z
2004
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/146477
eng
Ocean Engineering, 31 (8-9), 999-1018.
https://doi.org/10.1016/j.oceaneng.2003.11.003
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/781992024-02-17T17:25:51Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Space QUEST mission proposal: experimentally testing decoherence due to gravity
Joshi, Siddarth Koduru
Pienaar, Jacques
Ralph, Timothy C.
Cacciapuoti, Luigi
McCutcheon, Will
Rarity, John
Giggenbach, Dirk
Lim, Jin Gyu
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Models of quantum systems on curved space-times lack sufficient experimental verification. Some speculative theories suggest that quantum correlations, such as entanglement, may exhibit different behavior to purely classical correlations in curved space. By measuring this effect or lack thereof, we can test the hypotheses behind several such models. For instance, as predicted by Ralph et al [5] and Ralph and Pienaar [1], a bipartite entangled system could decohere if each particle traversed through a different gravitational field gradient. We propose to study this effect in a ground to space uplink scenario. We extend the above theoretical predictions of Ralph and coworkers and discuss the scientific consequences of detecting/failing to detect the predicted gravitational decoherence. We present a detailed mission design of the European Space Agency's Space QUEST (Space—Quantum Entanglement Space Test) mission, and study the feasibility of the mission scheme.
ESA 20772/07/NL/VJ
Austrian Research Promotion Agency FFG-ALR 854022 866025
European Space Agency ESA-ARTES 4000112591/14/NL/US
Austrian Science Fund FWF-SFB F40
Spanish Ministry of Economy and Competitiveness SEV-2015-0522
Fundaci Privada Cellex
Generalitat de Catalunya
Australian Research Council Centre of Excellence for Quantum Computation and Communication Technology No. CEI 10001027
Quantum Communications Hub EP/M013472/1
2018-08-22T08:56:42Z
2018-08-22T08:56:42Z
2018-06-12
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/78199
eng
New Journal of Physics, 20, 063016-1-063016-21.
20772/07/NL/VJ
FFG-ALR 854022 866025
4000112591/14/NL/US
FWF-SFB F40
SEV-2015-0522
CEI 10001027
EP/M013472/1
http://doi.org/10.1088/issn.1367-2630
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
IOP Science
oai:idus.us.es:11441/1533442024-02-17T16:48:51Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Introducción a la lógica cuántica
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Lógica cuántica
Teoría física
En este trabajo trataremos de responder las siguientes preguntas: 1. ¿Qué entendemos por «lógica» de una teoría física? 2. ¿Cuál es la lógica de la física clásica? 3. ¿Cómo se puede construir una lógica basada en la mecánica cuántica? 4. ¿Para qué sirve y para qué podría servir la lógica cuántica? Para ello, empezaremos estudiando la lógica de un sistema clásico sencillo. Después introduciremos la lógica cuántica propuesta por Birkhoff y von Neumann. Terminaremos describiendo tres ejemplos (el teorema de Kochen-Specker, el programa de las escuelas de Harvard y Ginebra, y el programa de Putnam) que ilustran los éxitos, expectativas y fracasos de la lógica cuántica.
2024-01-15T08:21:21Z
2024-01-15T08:21:21Z
2000
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/153344
spa
Arbor: Ciencia, pensamiento y cultura, 167 (659-660), 489-507.
https://arbor.revistas.csic.es/index.php/arbor/article/view/1178/1183
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Consejo Superior de Investigaciones Científicas, CSIC
oai:idus.us.es:11441/1348382024-02-17T16:24:36Zcom_11441_11034com_11441_10983com_11441_10690com_11441_10848com_11441_10802com_11441_10853com_11441_10863col_11441_11035col_11441_10849col_11441_10854col_11441_10864
Research facilities and highlights at the Centro Nacional de Aceleradores (CNA)
Gómez Camacho, Joaquín José
García López, Francisco Javier
Guerrero Sánchez, Carlos
López Gutiérrez, José María
García-Tenorio García-Balmaseda, Rafael
Santos Arévalo, Francisco Javier
Chamizo, E.
Ferrer Fernández, Francisco Javier
Jiménez Ramos, María del Carmen
Balcerzyk, Marcin
Fernández Martínez, Begoña
Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Universidad de Sevilla. Departamento de Física Aplicada I
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Fisiología Médica y Biofísica
European Union (UE). H2020
Ministerio de Ciencia e Innovación (MICIN). España
Junta de Andalucía
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
The Centro Nacional de Aceleradores is a user-oriented accelerator facility in Seville, Spain. Its main facilities are a 3 MV tandem accelerator, an 18 MeV proton Cyclotron, a tandetron used for AMS, a compact accelerator used for radiocarbon measurements, a 60Co irradiator and a PET/CT scanner. The technical specifications and research applications of these facilities are described. A neutron beam line associated to a charged pulsed beam in the tandem allows for time of flight measurements which determine the neutron energy. The use of an adequate stripper gas in the AMS tandetron permits to measure heavy radionuclides with very low detection levels, allowing to perform environmental studies using these radionuclides as tracers. The use of the microbeam in the tandem accelerator allows to apply the ion beam-induced current technique to investigate the spectroscopic properties and radiation hardness of different semiconductor detectors.
European Union, H2020-847594, H2020-654002, H2020-847552, H2020-847594
Ministry of Science RTI2018-098117-B-C21, RTC-2017-6369-3, EQC2018-004193-P, EQC2018-004095-P, EQC2018-004166- P, PGC2018-094546-B-I00
Junta de Andalucía FEDER US-1261006, US-1263369, P18-RT-1900
2022-06-30T10:03:21Z
2022-06-30T10:03:21Z
2021
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/134838
eng
The European Physical Journal Plus, 136 (3), 273.
H2020-847594
H2020-654002
H2020-847552
H2020-847594
RTI2018-098117-B-C21
RTC-2017-6369-3
EQC2018-004193-P
EQC2018-004095-P
EQC2018-004166- P
PGC2018-094546-B-I00
US-1261006
US-1263369
P18-RT-1900
https://dx.doi.org/10.1140/epjp/s13360-021-01253-x
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Springer
oai:idus.us.es:11441/1540432024-01-26T07:09:02Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Proposed experiment to test fundamentally binary theories
Kleinmann, Matthias
Vértesi, Tamás
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Economia, Industria y Competitividad (MINECO). España
Hungarian National Research Fund OTKA
Deutsche Forschungsgemeinschaft / German Research Foundation (DFG)
Binary theories
Quantum theory
Fundamentally binary theories are nonsignaling theories in which measurements of many outcomes are constructed by selecting from binary measurements. They constitute a sensible alternative to quantum theory and have never been directly falsified by any experiment. Here we show that fundamentally binary theories are experimentally testable with current technology. For that, we identify a feasible Bell-type experiment on pairs of entangled qutrits. In addition, we prove that, for any
n
, quantum
n
-ary correlations are not fundamentally
(
n
−
1
)
-ary. For that, we introduce a family of inequalities that hold for fundamentally
(
n
−
1
)
-ary theories but are violated by quantum
n
-ary correlations.
2024-01-26T07:09:02Z
2024-01-26T07:09:02Z
2017-09-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/154043
eng
Physical Review A (atomic, molecular, and optical physics and quantum information), 96 (3), 032104-1-032104-5.
FIS2014-60843-P
K111734
KH125096
GEDENTQOPT
KL 2726/2-1
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.96.032104
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1429582023-02-24T07:35:16Zcom_11441_10818com_11441_10802com_11441_10690com_11441_10853col_11441_10819col_11441_10854
The use of changes in small coastal Atlantic brooks in southwestern Europe as indicators of anthropogenic and climatic impacts over the last 400 years
Sousa Martín, Arturo
García Barrón, Leoncio
García Murillo, Pablo
Vetter, Mark
Morales González, Julia
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Biología Vegetal y Ecología
Ministerio de Economía y Competitividad (MINECO). España
Junta de Andalucía
Brook
Human impact
Late Holocene
Little Ice Age
Paleohydrology
SW Europe
Unlike other aquatic continental ecosystems such as lakes, small coastal brooks have not been used as indicators of anthropogenic or climatic impacts. Our study addresses reconstructing the evolution of coastal brooks in the southwest of Spain from the early seventeenth century to the end of the twentieth century using fieldwork, remote sensing, historical sources and microrelief. These brooks have had a continuous regression, losing 84.7 % of their length since 1630 AD. From the seventeenth century to the beginning of the twentieth century, climatic factors were responsible for the filling and siltation of the thalweg of brooks with sandy sediments of eolian origin. The alternation of dry and humid periods during the Little Ice Age in southern Spain favoured the mobilisation of sandy sediments in a process of secondary dunification, which was initiated during the eighteenth century and prominent at the end of the Little Ice Age. This process has coincided with a loss of water availability or an increase of aridity in some lakes and lagoons of southwestern Europe at the end of the nineteenth century. However, during the second half of the twentieth century, the average annual rate of thalweg regression almost quadrupled to 432.2 m year−1 mainly due to anthropogenic impacts associated with logging. These changes coincide with the mobilisation of sandy sediment and the erosion of coastal brooks in southwestern Portugal and other continental aquatic ecosystems in southwestern Spain. Therefore, we believe that changes in small coastal brooks can be used as indicators of anthropogenic and climatic impacts and, in the future, as sentinels to study the effects of climatic change just as lakes, reservoirs and rivers are considered.
Ministerio de Economía y Competitividad CGL2009-10683
Junta de Andalucía 158-2010
2023-02-23T14:35:09Z
2023-02-23T14:35:09Z
2015
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/142958
eng
Journal of Paleolimnology, 53 (1), 73-88.
CGL2009-10683
158-2010
https://doi.org/10.1007/s10933-014-9809-z
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Springer Nature
oai:idus.us.es:11441/1453502024-02-15T07:18:17Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Motivation and feelings of competence among university students in introductory physics
Romero Abrio, Ana
Hurtado Bermúdez, Santiago José
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. RNM138: Física Nuclear Aplicada
Physics
Metacognition
Dunning-Kruger
Motivation
Network analysis
This work analyzes whether there is a cognitive bias between the ideal perception of the skills and the real performance in an introductory physics class, and additionally, whether predictions of students’ performance are related to various motivational variables. We examined through a validated survey and network analysis the relationship between several motivational aspects and volitional variables with the accuracy of their predictions. The results show that the students present a motivational bias when students’ desires were considered, mainly in the students with low academic performance. Finally, it is necessary to explore the development of specific interventions that target the motivations of students, in order to be effective, and to reduce the gap between expected and actual grades, increasing students’ metacognitive skills and thus their academic performance.
2023-05-04T08:51:49Z
2023-05-04T08:51:49Z
2022
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/145350
eng
Research in Science Education.
https://link.springer.com/article/10.1007/s11165-022-10073-7
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Springer
oai:idus.us.es:11441/866232024-02-14T08:52:23Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
The GEOTRACES Intermediate Data Product 2017
Schlitzer, Reiner
Anderson, Robert F.
Masferrer Dodas, Elena
Lohan, Maeve
Villa Alfageme, María
Universidad de Sevilla. Departamento de Física Aplicada II
GEOTRACES
trace elements
Isotopes
electronic atlas
IDP2017
The GEOTRACES Intermediate Data Product 2017 (IDP2017) is the second publicly available data product of the
international GEOTRACES programme, and contains data measured and quality controlled before the end of
2016. The IDP2017 includes data from the Atlantic, Pacific, Arctic, Southern and Indian oceans, with about
twice the data volume of the previous IDP2014. For the first time, the IDP2017 contains data for a large suite of
biogeochemical parameters as well as aerosol and rain data characterising atmospheric trace element and isotope (TEI) sources. The TEI data in the IDP2017 are quality controlled by careful assessment of intercalibration
results and multi-laboratory data comparisons at crossover stations. The IDP2017 consists of two parts: (1) a
compilation of digital data for more than 450 TEIs as well as standard hydrographic parameters, and (2) the
eGEOTRACES Electronic Atlas providing an on-line atlas that includes more than 590 section plots and 130
animated 3D scenes. The digital data are provided in several formats, including ASCII, Excel spreadsheet,
netCDF, and Ocean Data View collection. Users can download the full data packages or make their own custom
selections with a new on-line data extraction service. In addition to the actual data values, the IDP2017 also
contains data quality flags and 1-σ data error values where available. Quality flags and error values are useful for
data filtering and for statistical analysis. Metadata about data originators, analytical methods and original
publications related to the data are linked in an easily accessible way. The eGEOTRACES Electronic Atlas is the
visual representation of the IDP2017 as section plots and rotating 3D scenes. The basin-wide 3D scenes combine
data from many cruises and provide quick overviews of large-scale tracer distributions. These 3D scenes provide
geographical and bathymetric context that is crucial for the interpretation and assessment of tracer plumes near
ocean margins or along ridges. The IDP2017 is the result of a truly international effort involving 326 researchers
from 25 countries. This publication provides the critical reference for unpublished data, as well as for studies
that make use of a large cross-section of data from the IDP2017. This article is part of a special issue entitled:
Conway GEOTRACES - edited by Tim M. Conway, Tristan Horner, Yves Plancherel, and Aridane G. González.
2019-05-21T11:09:05Z
2019-05-21T11:09:05Z
2018
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/86623
eng
Chemical Geology, 493, 210-223.
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/230322024-02-13T09:33:04Zcom_11441_10873com_11441_10802com_11441_10690com_11441_10853col_11441_10874col_11441_10854
An experimental approach to the fundamental principles of hemodynamics
Gaytán Guía, Susana Pilar
Pontiga Romero, Francisco de Paula
Universidad de Sevilla. Departamento de Fisiología
Universidad de Sevilla. Departamento de Física Aplicada II
2015-02-27T12:17:48Z
2015-02-27T12:17:48Z
2005
info:eu-repo/semantics/article
https://idus.us.es/handle/11441/23032
eng
Advances in Physiology Education, 29(3), 165-171
http://dx.doi.org/10.1152/advan.00009.2005
Atribución-NoComercial-SinDerivadas 4.0 España
http://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/openAccess
oai:idus.us.es:11441/1518372024-02-13T09:24:54Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Maximum nonlocality in the (3,2,2) scenario
López Rosa, Sheila
Xu, Zhen-Peng
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Economía y Competitividad (MINECO). España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
National Natural Science Foundation of China
Maximum nonlocality
Bell inequalities
We identify the simplest combinations of entanglement and incompatibility giving the maximum quantum violation for each of the 46 classes of tight Bell inequalities for the (3,2,2) scenario, i.e., three parties, two measurements per party, and two outcomes per measurement. This allows us to classify the maximum quantum nonlocality according to the simplest resources needed to achieve it. We show that entanglement and incompatibility only produce maximum nonlocality when they are combined in specific ways. For each entanglement class there is, in most cases, just one incompatibility class leading to maximum nonlocality. We also identify two interesting cases. We show that the maximum quantum violation of Śliwa inequality 23 only occurs when the third party measures the identity, so nonlocality cannot increase when we add a third party to the bipartite case. Almost quantum correlations predict that adding a new party increases nonlocality. This points out that either almost quantum correlations violate a fundamental principle or that there is a form of tripartite entanglement which quantum theory cannot account for. The other interesting case is the maximum quantum violation of Śliwa inequality 26, which, like the Mermin inequality, requires maximum incompatibility for all parties. In contrast, it requires a specific entangled state which has the same tripartite negativity as the W state.
2023-11-29T11:12:45Z
2023-11-29T11:12:45Z
2016-12-27
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/151837
eng
Physical Review A, 94 (6), 062121-1-062121-12.
FIS2014-60843-P
11475089
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.94.062121
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1442742024-02-14T20:19:39Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Bell nonlocality with intensity information only
Patrick, Ari
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Universidad de Sevilla
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Ministerio de Economia, Industria y Competitividad (MINECO). España
Bell nonlocality
Sampling
We address the problem of detecting bipartite Bell nonlocality whenever the only experimental information are the intensities produced in each run of the experiment by an unknown number of particles. We point out that this scenario naturally occurs in Bell experiments with parametric down-conversion when the crystal is pumped by strong pulses, in Bell tests with distant sources and in which particles suffer different delays during their flight, in Bell experiments using living cells as photo detectors, and in Bell experiments where the pairing
information is physically removed. We show that, although Bell nonlocality decreases as the number of particles increases, if the parties can distinguish arbitrarily small differences of intensities and the visibility is larger than 0.98, then Bell nonlocality can still be experimentally detected with fluxes of up to 15 particles. We show that this prediction can be tested with current equipment in a Bell experiment where pairing information is physically removed, but requires the assumption of fair sampling.
2023-04-13T06:35:49Z
2023-04-13T06:35:49Z
2020-09-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/144274
eng
Physical Review A, 102 (032201).
Project No. US-15097
FIS2017-89609-P
PCI2019-111885-2
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.102.032201
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1481532024-02-14T11:09:23Zcom_11441_10848com_11441_10802com_11441_10690com_11441_10853col_11441_10849col_11441_10854
A comparison of 210Pbxs, 137Cs, and Pu isotopes as proxies of soil redistribution in South Spain under severe erosion conditions
Peñuela Fernández, Andrés
Hurtado Bermúdez, Santiago José
García Gamero, Vanesa
Mas Balbuena, José Luis
Ketterer, M. E.
Vanwalleghem, Tom
Gómez Calero, José Alfonso
Ding, Shiming (Coordinador)
Ding, Shiming
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Física Aplicada I
Universidad de Sevilla. RNM138: Física Nuclear Aplicada
Ministerio de Ciencia, Innovación y Universidades (MICINN). España
Universidad de Sevilla
Isotopes
Soil redistribution
Severe erosion conditions
Licencia CC BY 4.0
Purpose The use of fallout radionuclides as proxies for the study of soil redistribution processes in semiarid environments
of Southern Spain has been restricted to 137Cs. The potential and limitations of alternative proxies such as 239+240Pu and
210Pbxs should be explored given the expected constrains imposed by the features of the study area.
Materials and methods Four soil and one sediment cores were collected in a highly eroded area to test the feasibility of
these proxies under demanding conditions. The use of gamma spectrometry and ICP-MS did allow exploring the potential
of 210Pbxs and Pu isotopes against the well-established tracer, 137Cs. The activity ratios 239+240Pu/137Cs were explored to
evaluate the previous evolution of the sampling sites. Soil redistribution rates were estimated using the model MODERN.
Results and discussion Despite all the profles showed intense perturbation, Pu isotopes showed the highest potential thanks
to higher sensitivity and sample throughput. The deviations of 239+240Pu/137Cs inventory ratios (0.012–0.158) from the global
fallout average (0.026±0.003) suggest that the sediment core was a deposition site involving alternate episodes of topsoil
removal and incorporation from diferent sources. The calculated erosion rates ranged 34–43 t ha−1 year−1, being in good
agreement for 137Cs and 239+240Pu. 210Pbxs was not used due to low-quality data.
Conclusions The use of Pu as a tracer of soil redistribution processes in semiarid areas seems to be promising even under
severe erosion conditions. The use of 210Pbxs is not recommended in this area due to its low concentration.
2023-07-21T10:32:55Z
2023-07-21T10:32:55Z
2023-06-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/148153
eng
Journal of Soils and Sediments, 2023.
FIS2015-69673-P
PID2019-109924RB-I00
VI PPI-ID SOL2017-9049
https://link.springer.com/article/10.1007/s11368-023-03560-5
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Springer
oai:idus.us.es:11441/1462612024-02-14T11:30:34Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
A comparison of two micro-beam X-ray emission techniques for actinide elemental distribution in microscopic particles originating from the hydrogen bombs involved in the Palomares (Spain) and Thule (Greenland) accidents
Jiménez Ramos, María del Carmen
Eriksson, Mats
García López, Francisco Javier
Ranebo, Y.
García-Tenorio García-Balmaseda, Rafael
Betti, Marco
Holm, Elis
Universidad de Sevilla. Departamento de Física Aplicada II
μ-PIXE
μ-XRF
Hot particle
U/Pu
In order to validate and to gain confidence in two micro-beam techniques: particle induced X-ray emission
with nuclear microprobe technique (μ-PIXE) and synchrotron radiation induced X-ray fluorescence in a
confocal alignment (confocal SR μ-XRF) for characterization of microscopic particles containing actinide
elements (mixed plutonium and uranium) a comparative study has been performed. Inter-comparison of the
two techniques is essential as the X-ray production cross-sections for U and Pu are different for protons and
photons and not well defined in the open literature, especially for Pu.
The particles studied consisted of nuclear weapons material, and originate either in the so called Palomares
accident in Spain, 1966 or in the Thule accident in Greenland, 1968. In the determination of the average Pu/U
mass ratios (not corrected by self-absorption) in the analysed microscopic particles the results from both
techniques show a very good agreement. In addition, the suitability of both techniques for the analysis with
good resolution (down to a few μm) of the Pu/U distribution within the particles has been proved. The set of
results obtained through both techniques has allowed gaining important information concerning the
characterization of the remaining fissile material in the areas affected by the aircraft accidents. This type of
information is essential for long-term impact assessments of contaminated sites
2023-05-17T17:49:00Z
2023-05-17T17:49:00Z
2010
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/146261
eng
Spectrochimica Acta. Part B Atomic Spectroscopy, 65 (9.10), 823-829.
https://doi.org/10.1016/j.sab.2010.08.001
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/998802024-02-13T08:49:08Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Determinación de 238pu, 239±240pu y 241pu en muestras medioambientales mediante espectrometría alfa con detectores semiconductores de implantación iónica
Vioque, Ignacio
García-Tenorio García-Balmaseda, Rafael
Jiménez Ramos, María del Carmen
Manjón, Guillermo
Universidad de Sevilla. Departamento de Física Aplicada II
2020-07-27T12:09:27Z
2020-07-27T12:09:27Z
2005-09
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/99880
spa
https://www.sepr.es/recursos/revista/pr45.pdf
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Sepr
oai:idus.us.es:11441/997762020-07-23T11:27:26Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854oai:idus.us.es:11441/1537082024-02-17T17:26:57Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
All noncontextuality inequalities for the n -cycle scenario
Araújo, Mateus
Quintino, Marco Túlio
Budroni, Costantino
Terra Cunha, Marcelo
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Conselho Nacional de Desenvolvimento Científico e Tecnológico. Brasil
Austrian Science Fund
John Templeton Foundation
Swiss National Science Foundation (SNFS)
Noncontextuality inequalities
Quantum correlations
The problem of separating classical from quantum correlations is, in general, intractable and has been solved explicitly only in a few cases. In particular, known methods cannot provide general solutions for an arbitrary number of settings. We provide the complete characterization of the classical correlations and the corresponding maximal quantum violations for the case of
n
≥
4
observables
X
0
,
...
,
X
n
−
1
, where each consecutive pair
{
X
i
,
X
i
+
1
}
, sum
mod
n
, is jointly measurable. This generalizes both the Clauser-Horne-Shimony-Holt and the Klyachko-Can-Binicioğlu-Shumovsky scenarios, which are the simplest ones for locality and noncontextuality, respectively. In addition, we provide explicit quantum states and settings with maximal quantum violation and minimal quantum dimension.
2024-01-22T09:36:39Z
2024-01-22T09:36:39Z
2013-08-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/153708
eng
Physical Review A (atomic, molecular, and optical physics and quantum information), 88 (2), 022118-1-022118-7.
FIS2011-29400
293933/ENFOQI
Y376-N16
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.88.022118
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1354702022-07-18T09:08:28Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Bell non-locality and Kochen-Specker contextuality: how are they connected?
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Universidad de Sevilla
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Ministerio de Economia, Industria y Competitividad (MINECO). España
Bell inequalities
Contextuality
Non-contextuality inequalities
Nonlocality
Bell non-locality and Kochen–Specker (KS) contextuality are logically independent concepts, fuel different protocols with quantum vs classical advantage, and have distinct classical simulation costs. A natural question is what are the relations between these concepts, advantages, and costs. To address this question, it is useful to have a map that captures all the connections between Bell non-locality and KS contextuality in quantum theory. The aim of this work is to introduce such a map. After defining the theory-independent notions of Bell non-locality and KS contextuality for ideal measurements, we show that, in quantum theory, due to Neumark’s dilation theorem, every quantum Bell non-local behavior can be mapped to a formally identical KS contextual behavior produced in a scenario with identical relations of compatibility but where measurements are ideal and no space-like separation is required. A more difficult problem is identifying connections in the opposite direction. We show that there are “one-to-one” and partial connections between KS contextual behaviors and Bell non-local behaviors for some KS scenarios, but not for all of them. However, there is also a method that transforms any KS contextual behavior for quantum systems of dimension d into a Bell non-local behavior between two quantum subsystems each of them of dimension d. We collect all these connections in map and list some problems which can benefit from this map.
2022-07-18T09:05:49Z
2022-07-18T09:05:49Z
2021-05-22
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135470
eng
Foundations of Physics, 51(61)
US-15097
FIS2017-89609-P
PCI2019-111885-2
https://link.springer.com/content/pdf/10.1007/s10701-021-00466-5.pdf
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Springer
oai:idus.us.es:11441/301572024-02-14T13:31:52Zcom_11441_10853com_11441_10802com_11441_10690com_11441_11230com_11441_11099col_11441_10854col_11441_11231
Stochastic Analysis of Time Series of Temperatures in the South-West of the Iberian Peninsula
García Barrón, Leoncio
Pita López, María Fernanda
Universidad de Sevilla. Departamento de Geografía Física y Análisis Geográfico Regional
Universidad de Sevilla. Departamento de Física Aplicada II
Stochastic processes
time series
climate change
Iberian Peninsula
Se han elaborado los modelos autorregresivos integrados de media móvil (ARIMA) para las series mensuales de larga duración, de temperaturas máximas y mínimas, de los observatorios del suroeste español. Se han transformado las series originales para hacerlas estacionarias. Se han obtenido los órdenes (p, d, q) para cada serie mensual y, tras los procesos de validación por medio de las series de residuos, también se han obtenido los parámetros de las funciones estimadas de los modelos estocásticos mensuales. Como consecuencia, se han formulado predicciones sobre su evolución: las previsiones de los modelos ARIMA inducen a esperar que la temperatura mínima en la región objeto de estudio se encuentra en una fase de incremento térmico medio previsto del orden de 0.2 °C en el próximo decenio. Sin embargo, no está definida significativamente la evolución de las temperaturas máximas. Estas estimaciones se corresponden con las obtenidas previamente por los autores, en estudios anteriores, por otros métodos, pero con mucha mayor precisión en este caso.
Autoregressive Integrated Moving Average (ARIMA) models have been devised for long-term monthly series of maximum and minimum temperatures from south-western Spanish observatories. The original series were transformed into stationary ones, and the orders (p, d, q) for each monthly series were obtained. These were validated using series of residuals, and the parameters of the functions were estimated from the monthly stochastic models. The forecasts of change formulated from the ARIMA models suggest that the minimum temperatures in the study area are in a mean warming phase of the order of 0.2 °C over the next decade. The change in maximum temperatures is not significantly defined. These estimations correspond with those obtained by the authors in earlier studies using other methods, but the level of precision is much higher in this case.
2015-10-28T13:36:11Z
2015-10-28T13:36:11Z
2004
info:eu-repo/semantics/article
https://idus.us.es/handle/11441/30157
eng
Atmósfera, 17(4), 225-244
http://www.revistas.unam.mx/index.php/atm/article/view/8534
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Universidad Nacional Autónoma de México
oai:idus.us.es:11441/997352024-02-14T13:47:11Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Application of the alpha spectrometry for the study of core sediment extracted in the San Marcos dam in Chihuahua
Méndez García, Cristina
García-Tenorio García-Balmaseda, Rafael
Rentería Villalobos, M.
Montero Cabrera, María Elena
Universidad de Sevilla. Departamento de Física Aplicada II
Espectrometría alfa
Uranio
Polonio
Núcleo de sedimento
The determination of the specific activities of210Po and isotopic uranium by alpha spectrometry was performed in a sediment core from SanMarcos Dam.The objective of this work was to analyze the vertical distribution of isotopic uranium and210Po and the behavior of these radionuclidesalong sediment core collected from the San Marcos Dam. Sample was divided into 11 sections, in which210Po and Isotopic Uranium weredetermined using liquid-liquid extraction with tributyl phosphate (TBP). Furthermore, it was made a comparison between the TBP techniqueand the technique of extraction chromatography using UTEVA resins for uranium.The results of specific activities for210Po show a trend to decrease along the core, whereas the uranium isotopic does not show a pointedtrend. The results of isotopic ratios between the234U and238U show that they are close to secular equilibrium in each of the core sections.The comparison between the two uranium extraction techniques indicates that chemical yield is better using the UTEVA technique than TBPextraction.
La determinaci ́on de las actividades espec ́ıficas de210Po y uranio isot ́opico mediante espectrometr ́ıa alfa fue realizada en un n ́ucleo desedimento de la Presa San Marcos. El objetivo de este trabajo fue analizar la distribuci ́on vertical de uranio isot ́opico y de210Po as ́ı como elcomportamiento de estos radion ́uclidos a lo largo del n ́ucleo de sedimento recolectado en la presa San Marcos. La muestra fue dividida en11 secciones. Para la determinaci ́on de210Po y de uranio isot ́opico en cada una de las secciones se utiliz ́o la t ́ecnica de extracci ́on l ́ıquido-l ́ıquido con tributil fosfato (TBP). Tambi ́en se realiz ́o una comparaci ́on entre la t ́ecnica del TBP y la t ́ecnica de cromatograf ́ıa de extracci ́oncon resinas UTEVA para el uranio isot ́opico. Los resultados de las actividades espec ́ıficas para210Po muestran una tendencia decrecientea lo largo del n ́ucleo, mientras que para uranio isot ́opico muestran una tendencia no mon ́otona. Los resultados de las relaciones isot ́opicasentre el234U y el238U muestran estar cerca del equilibrio secular en cada una de las secciones del n ́ucleo. La comparaci ́on entre las dost ́ecnicas de extracci ́on de uranio indica que se tiene un mayor rendimiento qu ́ımico mediante empleando la t ́ecnica de UTEVA.
2020-07-22T11:41:34Z
2020-07-22T11:41:34Z
2012
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/99735
eng
https://rmf.smf.mx/ojs/rmf/article/view/3913/3880
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Sociedad Mexicana de Física
oai:idus.us.es:11441/1525882024-02-17T17:13:40Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Quantum correlations from simple assumptions
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Foundational Questions Institute
Ministerio de Ciencia, Innovación y Universidades (MICINN). España
Junta de Andalucía
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Quantum correlations
Quantum theory
Bell and Kochen-Specker (KS) scenario
We address the problem of deriving the set of quantum correlations for every Bell and Kochen-Specker (KS)
contextuality scenario from simple assumptions. We show that the correlations that are possible according to
quantum theory are equal to those possible under the assumptions that there is a nonempty set of correlations
for every KS scenario and a statistically independent realization of any two KS experiments. The proof uses
tools of the graph-theoretic approach to correlations and deals with Bell nonlocality and KS contextuality in a
unified way.
2023-12-18T07:12:28Z
2023-12-18T07:12:28Z
2019-09-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/152588
eng
Physical Review A, 100 (032120).
FQXi-RFP-1608
FIS2017-89609-P
SOMM17/6105/UGR
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.100.032120
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/485892024-02-13T19:55:38Zcom_11441_11296com_11441_11290com_11441_10690com_11441_10848com_11441_10802com_11441_10853col_11441_11297col_11441_10849col_11441_10854
Evaluation of the radioactive impact of the phosphogypsum wastes used as amendment in agriculture soils
El Mrabet, Rachid
Abril Hernández, José María
Delgado García, Antonio
García-Tenorio García-Balmaseda, Rafael
Manjón Collado, Guillermo
Periáñez Rodríguez, Raúl
Universidad de Sevilla. Departamento de Física Aplicada I
Universidad de Sevilla. Departamento de Ciencias Agroforestales
Universidad de Sevilla. Departamento de Física Aplicada II
ENRESA
Some 3x109 kg of phosphogypsum (PG) wastes are annually generated by two fertiliser-production factories in Huelva (south-western Spain). PG has relatively high concentrations of 226Ra and other radionuclides, with an special concern due to the 222Rn emissions. These wastes could be used to improve the fertility of agriculture soils in a large former marsh area of the Guadalquivir river. Thus, it is interesting to study the levels and behaviour of natural radionuclides within this system to evaluate the radioactive impact of this amendment. An agronomical test is being conducted by one of the authors in an experimental farm in Lebrija (Seville). The soils are treated with 13 and 26 t ha-1 of PG, 30 t ha-1 of manure. Each treatment was repeated twice and continued for two years with beetroot and cotton plant production. We are measuring 226Ra (by alpha counting and gamma spectrometry) and U isotopes (by alpha spectrometry and ICP-MS analysis) in drainage waters, soils and vegetal-tissues samples. The PG used in the treatment has 620 ± 70 Bq kg-1 of 226Ra. The drainage waters have 226Ra contents similar to those from non-contaminated natural waters, but the uranium concentrations are one order of magnitude higher. Our results are suggesting that the major uranium input comes from the application of phosphatefertiliser. No significant levels of radionuclides were found in the vegetal tissues.
ENRESA
2016-11-15T10:57:26Z
2016-11-15T10:57:26Z
2005
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle/11441/48589
eng
Radioprotection. Revue de la Société Française de radioprotection, 40 (Supl. 1), S335-S341.
http://dx.doi.org/10.1051/radiopro:2005s1-050
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
E. D. P. Sciences
oai:idus.us.es:11441/985322024-02-17T17:16:38Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Experimental observation of quantum state-independent contextuality under no-signaling conditions
Ya Xiao
Zhen Peng Xu
Qiang Li
Jin Shi Xu
Kai Sun
Jin Ming Cui
Zong Quan Zhou
Hong Yi Su
Cabello Quintero, Adán
Jing Ling Chen
Chuan Feng Li
Guang Can Guo
Universidad de Sevilla. Departamento de Física Aplicada II
National key research and development program of China
National Natural Science Foundation of China
Contextuality, the impossibility of assigning context-independent measurement outcomes, is a critical resource for quantum computation and communication. No-signaling betweensuccessivemeasurementsisanessentialrequirementthatshouldbeaccomplishedin anytestofquantumcontextualityandthatisdifficulttoachieveinpractice.Here,weintroduce anoptimalquantumstate-independentcontextualityinequalityinwhichthedeviationfromthe classicalboundismaximal.Wethenexperimentallytestitusingsinglephotonsgeneratedfrom a defect in a bulk silicon carbide, while satisfying the requirement of no-signaling within the experimental error. Our results shed new light on the study of quantum contextuality under no-signalingconditions.
2020-06-30T13:25:31Z
2020-06-30T13:25:31Z
2018-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/98532
eng
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
OSA Publishing
oai:idus.us.es:11441/1490932024-02-14T20:18:42Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Experimental test of high-dimensional quantum contextuality based on contextuality concentration
Liu, Zheng-Hao
Meng, Hui-Xian
Xu, Zhen-Peng
Zhou, Jie
Chen, Jing-Ling
Xu, Jin-Shi
Li, Chuan-Feng
Guo, Guang-Can
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
National Natural Science Foundation of China
Universidad de Sevilla
Nonlocality
Optical tests of quantum theory
Quantum computation
Quantum correlations in quantum information
Quantum foundations
Quantum measurements
Structured light
Contextuality is a distinctive feature of quantum theory and a fundamental resource for quantum computation. However, existing examples of contextuality in high-dimensional systems lack the necessary robustness required in experiments. Here, we address this problem by identifying a family of noncontextuality inequalities whose maximum quantum violation grows with the dimension of the system. At first glance, this contextuality is the single-system version of multipartite Bell nonlocality taken to an extreme form. What is interesting is that the single-system version achieves the same degree of contextuality but uses a Hilbert space of lower dimension. That is, contextuality “concentrates” as the degree of contextuality per dimension increases. We show the practicality of this result by presenting an experimental test of contextuality in a seven-dimensional system. By simulating sequences of quantum ideal measurements with destructive measurements and repreparation in an all-optical setup, we report a violation of 68.7 standard deviations of the simplest case of the noncontextuality inequalities identified. Our results advance the investigation of high-dimensional contextuality, its connection to the Clifford algebra, and its role in quantum computation.
2023-09-22T05:53:44Z
2023-09-22T05:53:44Z
2023-06-13
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/149093
eng
Physical Review Letters, 130 (240202).
2021ZD0301400
61725504
11821404
U19A2075
WK2030000056
AHY060300
12275136
11875167
12075001
3072022TS2503
11901317
PID2020-113738 GB-I00
US-15097
PCI2019-111885-2
https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.130.240202
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1531282024-02-14T20:39:04Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Device-independent certification of two bits of randomness from one entangled bit and Gisin's elegant Bell inequality
Andersson, Ole
Badziag, Piotr
Dumitru, Irina
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Economia, Industria y Competitividad (MINECO). España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Randomness
Bell inequality
We prove that as conjectured by Acín et al. [Phys. Rev. A 93, 040102(R) (2016)], two bits of randomness can be certified in a device-independent way from one bit of entanglement using the maximal quantum violation of Gisin’s elegant Bell inequality. This suggests a surprising connection between maximal entanglement, complete sets of mutually unbiased bases, and elements of symmetric informationally complete positive operator-valued measures, on one side, and the optimal way of certifying maximal randomness, on the other.
2024-01-10T08:16:08Z
2024-01-10T08:16:08Z
2018-01-16
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/153128
eng
FIS2014-60843-P
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.97.012314
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/957562023-12-20T08:07:10Zcom_11441_10848com_11441_10802com_11441_10690com_11441_10853col_11441_10849col_11441_10854
Radioactive impact in sediments from an estuarine system affected by industrial wastes releases
Bolívar Raya, Juan Pedro
García-Tenorio García-Balmaseda, Rafael
Mas Balbuena, José Luis
Vaca Galán, Federico
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Física Aplicada I
Universidad de Sevilla. RNM138: Física Nuclear Aplicada
ENRESA
Comisión Interministerial de Ciencia y Tecnología (CICYT). España
Estuary
Phosphogypsum
Natural-radioactivity
Sediments
Gamma-spectrometry
Contamination pathways
A big fertilizer industrial complex and a vast extension of phosphogypsum piles (12 km2), sited in the estuary formed by the Odiel and
Tinto river mouths (southwest of Spain), are producing an unambiguous radioactive impact in their surrounding aquatic environment through
radionuclides from the U-series. The levels and distribution of radionuclides in sediments from this estuarine system have been determined.
The analyses of radionuclide concentrations and activity ratios have provided us with an interesting information to evaluate the extension,
degree and routes of the radioactive impact, as well as for the knowledge of the different pathways followed for the radioactive contamination
to disturb this natural system. The obtained results indicate that the main pathway of radioactive contamination of the estuary is through the
dissolution in its waters of the radionuclides released by the industrial activities and their later fixation on the particulate materials. Tidal
activity also plays an important role in the transport and homogenization along the estuary of the radioactivity released from the fertilizer
plants. D 2002 Elsevier Science Ltd. All rights reserved.
Junta de Andalucia (España) project 1FD97-0900-C02-02 (AMB)
2020-04-25T08:08:39Z
2020-04-25T08:08:39Z
2002
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/95756
eng
Environment international, 27 (8), 639-645.
1FD97-0900-C02-02 (AMB)
https://www.sciencedirect.com/science/article/pii/S0160412001001234
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/737292024-02-14T11:40:59Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Contribución de la Física a la formación del arquitecto técnico
López Tarrida, Antonio José
Fernández Rueda, A.
García Barrón, Leoncio
Moreno González, H.
Muñoz Aleñar, Martín
Pontiga Romero, Francisco de Paula
Ramírez Pérez, Antonio
Universidad de Sevilla. Departamento de Física Aplicada II
2018-04-27T11:17:58Z
2018-04-27T11:17:58Z
1995
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/73729
spa
Aparejadores. Boletín del Colegio Oficial de Aparejadores y Arquitectos Técnicos de Sevilla, 44, 93-97.
Atribución-NoComercial-SinDerivadas 3.0 Estados Unidos de América
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Colegio Oficial de Aparejadores y Arquitectos Técnicos de Sevilla
oai:idus.us.es:11441/454662024-02-13T09:53:04Zcom_11441_10853com_11441_10802com_11441_10690com_11441_2715com_11441_2379com_11441_137148col_11441_10854col_11441_2724
Aprendizaje con la internet: una aproximación critica
Borrás Martos, Ana Isabel
Universidad de Sevilla. Departamento de Física Aplicada I
Tecnologías de comunicación
Educación
Internet
Teorías de aprendizaje
Investigación
Variables socioeconómicas
En los últimos años, la Internet ha experimentado un crecimiento espectacular y los responsables de la educación de los países desarrollados preconizan su incorporación a todos los niveles de enseñanza. Este articulo propone una reflexión sobre la Internet desde perspectivas que incluyen el análisis de sus implicaciones socioeconómicas y la descripción de las teorías de aprendizaje y resultados de investigación que sustentan su aplicación en el terreno educativo. Él articulo igualmente invita a la consideración de los factores coyunturales que pueden determinar el éxito de tal aplicación.
2016-09-26T13:56:02Z
2016-09-26T13:56:02Z
1997
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle/11441/45466
spa
Pixel-Bit. Revista de Medios y Educación, 9, 5-13.
http://www.sav.us.es/pixelbit/articulos/n9/n9art/art91.htm
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Universidad de Sevilla
oai:idus.us.es:11441/1355202024-02-17T16:40:48Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Quantum randomness protected against detection loophole attacks
Mironowicz, Piotr
Cañas Cardona, Gustavo
Cariñe Catrileo, Jaime Andrés
Sepúlveda Gómez, Esteban Fernando
Figueroa Barra, Johanna
Cabello Quintero, Adán
Xavier, Guilherme B.
Moreira Lima, Gustavo
Pawłowski, Marcin
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Detection efficiency
Quantum random number generation
Device and semi-device-independent private quantum randomness generators are crucial for applications requiring private randomness. However, they are vulnerable to detection inefficiency attacks and this limits severely their usage for practical purposes. Here, we present a method for protecting semi-device-independent private quantum randomness generators in prepare-and-measure scenarios against detection inefficiency attacks. The key idea is the introduction of a blocking device that adds failures in the communication between the preparation and measurement devices. We prove that, for any detection efficiency, there is a blocking rate that provides protection against these attacks. We experimentally demonstrate the generation of private randomness using weak coherent states and standard avalanche photo-detectors.
2022-07-19T07:49:39Z
2022-07-19T07:49:39Z
2021-01-18
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135520
eng
Quantum Information Processing, 20 (1(39))
https://link.springer.com/content/pdf/10.1007/s11128-020-02948-3.pdf
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Springer
oai:idus.us.es:11441/1462622024-02-14T20:19:16Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
A dosimetric model for determining the effectiveness of soil covers for phosphogypsum waste piles
Mas Balbuena, José Luis
Bolívar, Juan Pedro
García-Tenorio García-Balmaseda, Rafael
Aguado Casas, Juan Luis
Gutiérrez San Miguel, Enrique
González Labajo, Jesús
Universidad de Sevilla. Departamento de Física Aplicada II
Soil
Dose assessment
Waste management
Uranium
Phosphogypsum (PG) is a by-product of the phosphoric acid production process that contains high concentrations of U-series radionuclides. PG piles formed during the last
30 years cover about 1,200 hectares and are located close to the
town of Huelva (Spain) on a salt-marsh. The regional government of Andalusia restored the area beginning in 1990 by
covering it with a 25-cm-thick layer of natural soil. With this
restoration, the external gamma-dose rate in the zone has
decreased drastically, approaching near environmental background values. This conclusion is based on results obtained
through in-situ monitoring measurements and through a dosimetric model developed for that particular radiation source.
As the model uses average parameters of the studied site, its
output does not show a correlation point by point with the
in-situ monitoring measurements. However, a good agreement
is observed in average values over the covered piles. The model
gives an average dose rate of 0.41 mGy y21 and the in situ
monitoring 0.40 mGy y21
. Based on this model, it is possible to
calculate the necessary thickness of soil to reduce the dosimetric contribution from a similar extension of PG until the
desired level is reached. In our conditions, in a 25-cm-thick
soil, about 0.19 mGy y21 is the increase produced by the PG
layer in relation to an infinitum soil layer. Consequently, no
radiological concern exists in the restored zones with respect to
the external gamma radiation
2023-05-17T18:08:21Z
2023-05-17T18:08:21Z
2001
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/146262
eng
Health Physics, 80 (1), 34-40.
https://journals.lww.com/health-physics/Abstract/2001/01000/A_DOSIMETRIC_MODEL_FOR_DETERMINING_THE.7.aspx
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Lippincott
oai:idus.us.es:11441/1531342024-01-10T09:35:48Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
No-hidden-variables proof for two spin-1/2 particles preselected and postselected in unentangled states
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Quantum mechanics
Particles
Variables
It is a well-known fact that all the statistical predictions of quantum mechanics on the state of any physical system represented by a two-dimensional Hilbert space can always be duplicated by a noncontextual hidden-variables model. In this paper, I show that, in some cases, when we consider an additional independent (unentangled) two-dimensional system, the quantum description of the resulting composite system cannot be reproduced using noncontextual hidden variables. In particular, a no-hidden-variables proof is presented for two individual spin- particles preselected in an uncorrelated state |A〉⊗|B〉 and postselected in another uncorrelated state |a〉⊗|B〉, |B〉 being the same state for the second particle in both preselection and postselection.
2024-01-10T09:35:48Z
2024-01-10T09:35:48Z
1997-06-01
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/153134
eng
Physical Review A (atomic, molecular, and optical physics and quantum information), 55, 4109-4111.
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.55.4109
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1464702024-02-14T13:30:23Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
A revision of energy and resolution calibration method of Ge detectors
Hurtado Bermúdez, Santiago José
García León, Manuel
García-Tenorio García-Balmaseda, Rafael
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Gamma-spectrometry
Energy calibration
Resolution calibration
The energy and resolution calibration of germanium detectors being basic procedures in gamma-ray spectrometry have not been
usually studied in depth. In this paper a new approach to these calibration methods based on the Orthogonal Distance Regression (ODR)
algorithm is presented. This algorithm treats more adequately all uncertainties involved in the calibration process and produces better
results than the usual Ordinary Least Squares (OLS) algorithm. Additionally a study of the functions involved in energy and resolution
calibration of germanium detectors has been also carried out.
2023-05-19T17:41:09Z
2023-05-19T17:41:09Z
2006
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/146470
eng
Nuclear Instruments and Methods in Physics Research. Section A Accelerators, Spectrometers, Detectors and Associated Equipment, 564 (1), 295-299.
https://doi.org/10.1016/j.nima.2006.03.018
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/1429272023-02-22T17:40:48Zcom_11441_10818com_11441_10802com_11441_10690com_11441_10853com_11441_11230com_11441_11099col_11441_10819col_11441_10854col_11441_11231
Intra-annual rainfall variability in the Spanish hydrographic basins
García Barrón, Leoncio
Aguilar Alba, Mónica
Morales González, Julia
Sousa Martín, Arturo
Universidad de Sevilla. Departamento de Biología Vegetal y Ecología
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. Departamento de Geografía Física y Análisis Geográfico Regional
Basins
Centralisation parameter
Dispersion parameter
Iberian peninsula
Intra-annual rainfall
NAO
Temporal irregularity
WeMO
Understanding the intra-annual distribution of rainfall is an important element for climatic classification and serves as a basis for natural resources management. The present study analyses multi-annual irregularities of the rainfall distribution throughout the year in the period 1941–2010, in the hydrographic basins of the Iberian Peninsula. In order to analyse its variation, the rainfall centralisation and dispersion parameters throughout the annual cycle were previously defined and calculated for each year. Inter-annual series of both parameters were generated, which allowed detecting their temporal behaviour in each of the basins and relating differentiated geographic areas. Independent of the total annual rainfall, greater temporal simultaneity is observed in the fluctuations of the intra-annual parameter ‘centralisation’ in the Atlantic basins and wider inter-annual oscillations in the Mediterranean basins. Around the year 1970, there was a displacement in the predominance of autumn rains, although the process is inverted in the last decades. Also from the decade of 1970 there is a general increase in the inter-annual variability of the ‘dispersion’ parameter, especially in the basins that drain towards the Atlantic Ocean. The ‘dispersion’ parameter allows detecting latitudinal (Cantabrian vs. Guadalquivir) and longitudinal (Atlantic vs. Mediterranean) patterns of intra-annual rainfall distribution irregularity in the Iberian Peninsula. The results obtained are also associated to atmospheric general circulation patterns of the North Atlantic Oscillation and the Western Mediterranean Oscillation. The monthly winter values of the North Atlantic Oscillation present a marked influence on dispersion, especially in the basins that discharge into the Atlantic Ocean, which show a double gradient: decreasing longitudinally from the Atlantic coast to the Mediterranean coast and latitudinally from north to south.
2023-02-22T17:40:48Z
2023-02-22T17:40:48Z
2018
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/142927
eng
International Journal of Climatology, 38 (5), 2215-2229.
https://doi.org/10.1002/joc.5328
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Wiley-Blackwell
oai:idus.us.es:11441/1356482022-07-20T11:30:16Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Nonmonotonic quantum phase gathering in curved spintronic circuits
Rodríguez Fernández, Eusebio Jesús
Frustaglia, Diego César
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Quantum phase
Curved spintronic circuits
Spin carriers propagating along quantum circuits gather quantum spin phases depending on the circuit’s
size, shape, and spin-orbit coupling (SOC) strength. These phases typically grow monotonically with the SOC
strength, as found in Rashba quantum wires and rings. In this work we show that the spin-phase gathering can
be engineered by geometric means, viz., by the geometric curvature of the circuits, to be nonmonotonic. We
demonstrate this peculiar property by using one-dimensional polygonal models where flat segments alternate
with highly curved vertices. The complex interplay between dynamic and geometric spin-phase components—
triggered by a series of emergent spin degeneracy points—leads to bounded, global spin phases. Moreover, we
show that the particulars of the spin-phase gathering have observable consequences in the Aharonov-Casher
conductance of Rashba loops, a connection that passed unnoticed in previous works.
2022-07-20T11:30:16Z
2022-07-20T11:30:16Z
2021-11-24
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135648
eng
Physical Review B, 104 (19(195308))
https://journals.aps.org/prb/pdf/10.1103/PhysRevB.104.195308
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1429612024-02-14T20:34:01Zcom_11441_10818com_11441_10802com_11441_10690com_11441_10853col_11441_10819col_11441_10854
Changes in the Erica ciliaris Loefl. ex L. peat bogs of southwestern Europe from the 17th to the 20th centuries ad
Sousa Martín, Arturo
Morales González, Julia
García Barrón, Leoncio
García Murillo, Pablo
Universidad de Sevilla. Departamento de Biología Vegetal y Ecología
Universidad de Sevilla. Departamento de Física Aplicada II
Ministerio de Educación y Ciencia (MEC). España
Junta de Andalucía
'Little Ice Age'
Anthropogenic impact
Atlantic species
Erica ciliaris
Historical data
Iberian Peninsula
Peat bogs
Water-table
This paper analyses a reconstruction of changes from the 17th to the 20th centuries in peat bogs with Erica ciliaris Loefl. ex L. heathlands in southwestern Europe. The reconstruction is performed by means of a multidisciplinary method based on photointerpretation, the examination of historical sources (documentation and maps), and an analysis of microtopography. Historical sources and aerial photos from 1956 and 1987 have also been used to reconstruct the impacts of anthropic activity. In the study area, Doñana Natural Park (SW Iberian Peninsula), peat bogs currently occupy slightly more than 8% of the area that they covered at the beginning of the 17th century. A parallel analysis of anthropic activity in the area over the last four centuries reveals the key role of humans in the disappearance of these peat bogs. This drastic reduction of peat bog area during the 20th century is due to a lowering of the water-table as a result of the impacts of anthropic activity, primarily the establishment of monocultures of Eucalyptus spp. and Pinus pinea. An earlier lowering of the water-table, before these plantations, is attributable to a process of aridisation associated with post-'Little Ice Age' warming. Therefore, the impacts associated with climatic trends are synergistically superimposed on those derived from the intense anthropic activity that occurred during the second half of the 20th century. This synergy resulted in a reduction of the surface occupied by the studied peat bogs and their associated E. ciliaris heathlands by 91.1% in SW Europe.
Ministerio de Educación y Ciencia CGL2006-07194/BOS, CGL2009-10683
Junta de Andalucía 158-2010
2023-02-23T15:17:06Z
2023-02-23T15:17:06Z
2013
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/142961
eng
Holocene, 23 (2), 255-269.
CGL2006-07194/BOS
CGL2009-10683
158-2010
https://doi.org/10.1177/0959683612455545
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
SAGE
oai:idus.us.es:11441/1354672024-02-14T13:26:23Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Quantum network approach to spin interferometry driven by Abelian and non-Abelian fields
Hijuano, A.
Van den Berg, Tineke Louise
Frustaglia, Diego César
Bercioux, Dario
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Ciencia, Innovación y Universidades (MICINN). España
Quantum network
Abelian fields
non-Abelian fields
We present a theory of conducting quantum networks that accounts for Abelian and non-Abelian fields acting on spin carriers. We apply this approach to model the conductance of mesoscopic spin interferometers of different geometry (such as squares and rings), reproducing recent experimental findings in nanostructured InAsGa quantum wells subject to Rashba spin-orbit and Zeeman fields (as, e.g., the manipulation of Aharonov-Casher interference patterns by geometric means). Moreover, by introducing an additional field-texture engineering, we manage to single out a previously unnoticed spin-phase suppression mechanism. We notice that our approach can also be used for the study of complex networks and the spectral properties of closed systems.
2022-07-18T08:52:18Z
2022-07-18T08:52:18Z
2021-04-21
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135467
eng
Physical Review B, 103 (15 (155419))
FIS2017-82804-P
FIS2017- 86478-P
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
oai:idus.us.es:11441/121052024-02-13T09:23:27Zcom_11441_10853com_11441_10802com_11441_10690com_11441_2781com_11441_2379com_11441_137148col_11441_10854col_11441_2817
Una propuesta de investigación-acción para la mejora del aprendizaje de los alumnos en el laboratorio de la asignatura Fundamentos Físicos de la Arquitectura Técnica
Espín Milla, Manuel Jesús
López Tarrida, Antonio José
Universidad de Sevilla. Departamento de Física Aplicada II
Este trabajo resume el proyecto de investigación realizado por sus autores dentro del Programa
de Formación de Profesores Noveles de la Universidad de Sevilla. Tomando como base
la opinión de estudiantes y profesores, se identificó la necesidad de una acción de mejora en
el desarrollo de las sesiones de laboratorio de la asignatura Fundamentos Físicos de la Arquitectura
Técnica: facilitar a los alumnos la realización y comprensión de la práctica dedicada al
estudio de la corriente alterna. A requerimiento de éstos, el equipo docente implementó nuevo
material de apoyo, que incluye conceptos y procedimientos, y que busca fomentar un aprendizaje
autónomo, asíncrono y autorregulado. Basado en presentaciones flash, como unidades de
aprendizaje independientes, este material integra texto, gráficos, vídeo y audio con comentarios
de uno de los autores, además de cuestionarios de autoevaluación. El análisis de los resultados
mostró que los estudiantes utilizaron este material y que les fue útil en su formación.
This paper summarizes the research project performed by the authors in the Teacher Training Programme for Novices supported by the University of Seville (Spain). Based on the viewpoints of the students and teachers involved, it was discovered that an improvement in the laboratory sessions of the subject Foundations of Physics for Technical Architecture was necessary in order to help the students to carry out and understand the practical classes devoted to the study of the alternating electric current. Additional support material, which included concepts and procedures and sought to promote independent, self-regulated and asynchronous learning was implemented. include interactive text, images, video and audio recorded from one of the authors’ comments Based on flash presentations as units of independent learning, interactive text, images, video, and audio material were integrated together with comments from one of the authors and a self-evaluation questionnaire. The analysis of the results showed that the students used this material and that it proved useful in their training.
2014-11-26T13:28:24Z
2014-11-26T13:28:24Z
2009
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle/11441/12105
spa
Revista de Enseñanza Universitaria, 33, 10-22.
Atribución-NoComercial-SinDerivadas 4.0 España
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
oai:idus.us.es:11441/1354542024-02-13T08:48:53Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Graph-theoretic approach to dimension witnessing
Ray, Maharshi
Boddu, Naresh Goud
Bharti, Kishor
Kwek, Leong Chuan
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Universidad de Sevilla
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Ministerio de Economia, Industria y Competitividad (MINECO). España
Dimension witness
Quantum
Graph theory
Contextuality
A fundamental problem in quantum computation and quantum information is finding the minimum quantum dimension needed for a task. For tasks involving state preparation and measurements, this problem can be addressed using only the input–output correlations. This has been applied to Bell, prepare-and-measure, and Kochen–Specker contextuality scenarios. Here, we introduce a novel approach to quantum dimension witnessing for scenarios with one preparation and several measurements, which uses the graphs of mutual exclusivity between sets of measurement events. We present the concepts and tools needed for graph-theoretic quantum dimension witnessing and illustrate their use by identifying novel quantum dimension witnesses, including a family that can certify arbitrarily high quantum dimensions with few events.
2022-07-18T07:43:35Z
2022-07-18T07:43:35Z
2021-03
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135454
eng
New Journal of Physics, 23 (3(033006))
US-15097
FIS2017-89609-P
PCI2019-111885-2
https://iopscience.iop.org/article/10.1088/1367-2630/abcacd/pdf
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
IOP Publishing
oai:idus.us.es:11441/1481562023-07-27T10:33:45Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854oai:idus.us.es:11441/1462602024-02-17T17:28:31Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
A comparative evaluation of the CF:CS and CRS models in 210Pb chronological studies applied to hydrographic basins in Brazil
Bonotto, Daniel Marcos
García-Tenorio García-Balmaseda, Rafael
Universidad de Sevilla. Departamento de Física Aplicada II
210Pb-method
CF:CS model
CRS model
Sedimentation rate
SiO2–LOI trends
The Constant Flux: Constant Sedimentation (CF:CS) and Constant Rate of Supply (CRS) of unsupported⧸
excess 210Pb models have been applied to a 210Pb data set providing of eighteen sediments profiles
sampled at four riverine systems occurring in Brazil, South America: Corumbataí River basin (S1¼Site 1,
São Paulo State), Atibaia River basin (S2¼Site 2, São Paulo State), Ribeirão dos Bagres basin (S3¼Site 3,
São Paulo State) and Amazon River mouth (S4¼Site 4, Amapá State). These sites were chosen for a
comparative evaluation of the performance of the CF:CS and CRS models due to their pronounced
differences on the geographical location, geological context, soil composition, biodiversity, climate, rainfall,
and water flow regime, among other variable aspects. However, all sediments cores exhibited a common
denominator consisting on a database built from the use of the same techniques for acquiring the
sediments major chemical composition (SiO2, Al2O3, Na2O, K2O, CaO, MgO, Fe2O3, MnO, P2O5, TiO2 and
LOI-Loss on Ignition) and unsupported⧸excess 210Pb activity data. In terms of sedimentation rates, the
performance of the CRS model was better than that of the CF:CS model as it yielded values more compatible
with those expected from field evidences. Under the chronological point of view, the CRS model always
provided ages within the permitted range of the 210Pb-method in the studied sites, whereas the CF:CS
model predicted some values above 150 years. The SiO2 content decreased in accordance with the LOI
increase in all cores analyzed and such inverse relationship was also tracked in the SiO2–LOI curves of
historical trends. The SiO2–LOI concentration fluctuations in sites S1 and S3 also coincided with some
Cu and Cr inputs in the drainage systems.
2023-05-17T17:29:44Z
2023-05-17T17:29:44Z
2014
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/146260
eng
Applied Radiation and Isotopes, 92, 58-72.
https://doi.org/10.1016/j.apradiso.2014.06.012
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Elsevier
oai:idus.us.es:11441/537452024-02-14T19:08:50Zcom_11441_10853com_11441_10802com_11441_10690com_11441_11255com_11441_11099com_11441_2781com_11441_2379com_11441_137148col_11441_10854col_11441_11256col_11441_18586
Las necesidades de orientación para el acceso a la universidad de los alumnos preuniversitarios
Mora Merchán, Joaquín Antonio
Rodríguez Santos, María Dolores
Zambrano Muñoz, Mª Dolores
García Barrón, Leoncio
Universidad de Sevilla. Departamento de Psicología Evolutiva y de la Educación
Universidad de Sevilla. Departamento de Física Aplicada II
2017-02-07T08:02:38Z
2017-02-07T08:02:38Z
1992
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle/11441/53745
spa
Revista de Enseñanza Universitaria (R.E.U.), Número extra 1992, 45-60.
http://institucional.us.es/revistas/universitaria/extra/art_5.pdf
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Universidad de Sevilla
oai:idus.us.es:11441/1561312024-03-12T09:55:22Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Structural explanation of the rheology of a colloidal suspension under high dc electric fields
Espín Milla, Manuel Jesús
Delgado Mora, Ángel Vicente
González Caballero, Fernando
Universidad de Sevilla. Departamento de Física Aplicada II
Ministerio de Ciencia y Tecnología (MCYT). España
Rheology
Electric fields
In this work we describe the electrorheology of suspensions consisting of hematite
(
α
−
Fe
2
O
3
)
particles dispersed in silicone oil in the presence of large dc electric fields. If an electric field pulse is applied to the systems, it is possible to estimate the time that the electrorheological (ER) fluid takes to reach its final microstructure in the presence of the field. Our results indicate that response times of several seconds are typical, and that this time decreases with the field strength. Conventional shear-rate sweeps indicate the existence of a well-defined dynamic yield stress and a shear-thinning behavior. Interestingly, both the yield stress and the shear-thinning slope
a
[relating the viscosity,
η
, and the shear rate,
˙
γ
, as
η
=
a
˙
γ
−
b
+
η
(
∞
)
] show a linear dependence on the field strength,
E
, in disagreement with the
E
2
dependence often reported. This deviation is associated with changes in the conductivity of the dispersion medium with the field strength. A simple calculation of the interactions present in our ER fluid demonstrates that the ER behavior is entirely controlled by hydrodynamic
(
∝
˙
γ
)
and electrical forces
(
∝
E
)
. This is confirmed by the collapse of all experimental results in a single master curve when the relative viscosity is plotted against the ratio
˙
γ
∕
E
. Careful attention has been paid in this work to the microstructure of the suspensions in the presence of both shear and electric fields simultaneously: the particles gather themselves on the walls of the electrorheological measurement cell, forming aggregates with cylindrical symmetry, shaped as rings or lamellas of solids. The electric field induced increase in viscosity is the consequence of the balance between two actions: that of the electric field, tending to keep particles together, and that of the shear field, forcing the flow of the liquid phase in the regions between rings or between rings and walls.
2024-03-12T09:55:22Z
2024-03-12T09:55:22Z
2006-04-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/156131
eng
Physical review E (statistical, nonlinear, biological, and soft matter physics), 73 (4), 041503-1-041503-11.
FIS2005-06860-CO2-1
https://journals.aps.org/pre/pdf/10.1103/PhysRevE.73.041503
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1491222024-02-14T11:07:32Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
What causes the inverse relationship between primary production and export efficiency in the Southern Ocean?
Le Moigne, Frédéric A. C.
Henson, Stephanie A.
Cavan, Emma
Georges, Clément
Pabortsava, Katsiaryna
Achterberg, Eric P.
Ceballos Romero, Elena
Zubkov, Mike
Sanders, Richard J.
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. RNM138: Física Nuclear Aplicada
Southern Ocean
CO2 levels
Dissolved organic carbon
The ocean contributes to regulating atmospheric CO2 levels, partly via variability in the fraction of primary production (PP) which is exported out of the surface layer (i.e., theeratio). Southern Ocean studies have found that contrary to global-scale analyses, an inverse relationship exists betweeneratio and PP. This relationship remains unexplained, with potential hypotheses being (i) large export of dissolved organic carbon (DOC) in high PP areas, (ii) strong surface microbial recycling in high PP regions, and/or (iii) grazing-mediated export that varies inversely with PP. We find that the export of DOC has a limited influence in setting the negative e ratio/PP relationship. However, we observed that at sites with low PP and high e ratios, zooplankton-mediated export is large and surface microbial abundance low suggesting that both are important drivers of the magnitude of the e ratio in the Southern Ocean.
2023-09-25T08:03:51Z
2023-09-25T08:03:51Z
2016-05-07
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/149122
eng
Geophysical Research Letters, 43 (9), 4457-4466.
https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1002/2016GL068480
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Wiley
oai:idus.us.es:11441/1541102024-01-29T08:11:19Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Necessary and sufficient condition for contextuality from incompatibility
Xu, Zhen-Peng
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Contextuality
Incompatibility
Measurement incompatibility is the most basic resource that distinguishes quantum from classical physics. Contextuality is the critical resource behind the power of some models of quantum computation and is also a necessary ingredient for many applications in quantum information. A fundamental problem is thus identifying when incompatibility produces contextuality. Here, we show that, given a structure of incompatibility characterized by a graph in which nonadjacent vertices represent incompatible ideal measurements, the necessary and sufficient condition for the existence of a quantum realization producing contextuality is that this graph contains induced cycles of size larger than three.
2024-01-29T08:11:19Z
2024-01-29T08:11:19Z
2019-02-12
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/154110
eng
Physical Review A (atomic, molecular, and optical physics and quantum information), 99 (2), 020103-1-020103-7.
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.99.020103
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1356962024-02-17T17:57:03Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Bosonic indistinguishability-dependent contextuality
Asadian, Ali
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Quantum
Producing contextual correlations in sequences of measurements on single quantum systems faces two
major problems. One is the experimental difficulty of performing sequences of ideal measurements on highdimensional quantum systems, a problem that also affects other forms of quantum temporal correlations. The
other is the simulability with classical light of existing contextuality experiments with photons. Here, we
introduce a scheme that solves both problems. We show that, by encoding quantum information in n 2
indistinguishable bosons in m 2 modes, targeting observables exploiting the bunching-antibunching of bosons,
and performing ideal measurements by dispersively coupling these systems with auxiliary qubits, it is possible
to realize sequential quantum measurements on high-dimensional quantum systems and produce contextuality
which cannot be simulated by classical light, as it relies on indistinguishability and higher-order interference.
2022-07-21T11:48:36Z
2022-07-21T11:48:36Z
2022
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135696
eng
Physical Review A, 105, 1-11.
https://doi.org/10.1103/PhysRevA.105.012404
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1534062024-02-14T09:24:53Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
The effect of the electric wind on the spatial distribution of chemical species in the positive corona discharge
Yanallah, Khelifa
Pontiga Romero, Francisco de Paula
Bouazza, Mohamed Ridha
Chen, J.
Universidad de Sevilla. Departamento de Física Aplicada II
Electric wind
Positive corona discharge
Semi-analytic approach
Wire-to-plane geometry
Fluid model
The electrohydrodynamic air flow generated by a positive corona discharge, and its
effect on the spatial distribution of chemical species within a wire-plate corona reactor, have
been numerically simulated. The computational model is based on the solutions of the Navier-
Stokes equation and the continuity equation of each chemical species generated by the
electrical discharge. A simplified analytical expression of the electric force density, which only
requires the current density as the input parameter, has been used in the Navier-Stokes equation
to obtain the velocity field. For the solution of the continuity equations, a plasma chemistry
model that includes the most important reactions between electrons, atoms and molecules in air
has been used. Similar to the electric force, the electron density distribution has been
approximated by using a semi-analytical expression appropriate for the electrode geometry.
The results of the study show that the spatial distribution of chemical species can be very
different, and depends on the interplay between the electrohydrodynamic flow, the chemical
kinetics of the species and its characteristic lifetime.
2024-01-15T17:33:35Z
2024-01-15T17:33:35Z
2017
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/153406
eng
Journal of Physics. D: Applied Physics, 50, 1-15.
https://dx.doi.org/10.1088/1361-6463/aa7b24
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
IOP
oai:idus.us.es:11441/1430962024-02-13T09:17:04Zcom_11441_10853com_11441_10802com_11441_10690com_11441_10863com_11441_11371com_11441_11290col_11441_10854col_11441_10864col_11441_11372
First absolute measurements of fast-ion losses in the ASDEX Upgrade tokamak
Rodríguez Ramos, Mauricio
García Muñoz, Manuel
Jiménez Ramos, María del Carmen
García López, Francisco Javier
Galdón Quiroga, Joaquín
Sanchís Sánchez, Lucía
Ayllón Guerola, Juan Manuel
Faitsch, M.
González Martín, Javier
Hermann, Andreas
Marne, P. De
Rivero Rodríguez, Juan Francisco
Sieglin, B.
Snicker, Antti
Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear
Universidad de Sevilla. Departamento de Ingeniería Mecánica y de Fabricación
Universidad de Sevilla. Departamento de Física Aplicada II
Ministerio de Economia, Industria y Competitividad (MINECO). España
EUROfusion Consortium
Comunidad Europea de la Energía Atómica
Absolute flux
Fast-ion
Fast-ion loss detector
Ionoluminescence
A new diagnostic technique that allows to obtain absolute fluxes of fast-ion losses measured with absolutely calibrated scintillator based fast-ion loss detectors (FILD) is presented here. First absolute fluxes of fast-ion losses have been obtained in the ASDEX Upgrade tokamak. An instrument function that includes the scintillator efficiency, collimator geometry, optical transmission and camera efficiency has been constructed. The scintillator response to deuterium ions in the relevant energy range of fast-ions has been characterized using a tandem accelerator. Absolute flux of neutral beam injection (NBI) prompt losses has been obtained in magnetohydrodynamic quiescent plasmas. The temporal evolution of the heat load measured with FILD follows that measured at the FILD entrance obtained with an Infra-Red camera looking at the FILD detector head. ASCOT simulations are in good agreement with the absolute heat load of NBI prompt losses measured with FILD.
Ministerio de Economía, Industria y Competitividad RYC-2011-09152, FIS2015-69362-P, ENE2012-31087
EUROfusion Consortium PCIG11-GA-2012- 321455
Comunidad Europea de la Energía Atómica 633053
2023-03-02T16:59:02Z
2023-03-02T16:59:02Z
2017
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/143096
eng
Plasma Physics and Controlled Fusion, 59 (10), 105009.
RYC-2011-09152
FIS2015-69362-P
ENE2012-31087
PCIG11-GA-2012- 321455
633053
https://doi.org/10.1088/1361-6587/aa7e5f
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Institute of Physics Publishing
oai:idus.us.es:11441/1556252024-02-27T06:56:49Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Two qubits of a W state violate Bell's inequality beyond Cirel'son's bound
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Ministerio de Ciencia y Tecnología (MCYT). España
Junta de Andalucía
W state
Bell's inequality
Cirel'son's bound
It is shown that the correlations between two qubits selected from a trio prepared in a W state violate the Clauser-Horne-Shimony-Holt inequality more than the correlations between two qubits in any quantum state. Such a violation beyond Cirel’son’s bound is smaller than the one achieved by two qubits selected from a trio in a Greenberger-Horne-Zeilinger state [A. Cabello, Phys. Rev. Lett. 88, 060403 (2002)]. However, it has the advantage that all local observers can know from their own measurements whether or not their qubits belong to the selected pair.
2024-02-27T06:56:49Z
2024-02-27T06:56:49Z
2002-10
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/155625
eng
Physical Review A (atomic, molecular, and optical physics and quantum information) [English], 66 (4), 042114-1-042114-5.
BFM2001-3943
FQM-239
https://journals.aps.org/pra/pdf/10.1103/PhysRevA.66.042114
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1429652024-02-12T21:30:00Zcom_11441_10818com_11441_10802com_11441_10690com_11441_10853col_11441_10819col_11441_10854
Characterisation of the intra-annual rainfall and its evolution (1837-2010) in the southwest of the Iberian Peninsula
García Barrón, Leoncio
Morales González, Julia
Sousa Martín, Arturo
Universidad de Sevilla. Departamento de Biología Vegetal y Ecología
Universidad de Sevilla. Departamento de Física Aplicada II
Ministerio de Educación y Ciencia (MEC). España
Junta de Andalucía
Variability in precipitation affects annual total records and causes instability in rainfall distribution throughout the year. Our aim in this study was to develop a procedure, based on pluviometric centralisation and dispersion parameters, that is able to characterise rainfall distribution throughout a year of precipitation in a unique, condensed and precise manner. This enabled the evolution of intra-annual precipitation from 1837 to 2010 in the southwest of the Iberian Peninsula to be determined. The obtained results showed irregular oscillations of the parameters during the selected period. Specifically, patterns of precipitation in recent decades revealed the following differentiating features: the displacement of the most intense rainy periods in autumn with a consequent decrease in precipitation in spring, and more erratic distribution throughout the year with an increase of the frequency of intra-annual dispersion peaks.
Ministerio de Educación y Ciencia CGL2009-10683
Junta de Andalucía 158 2010
2023-02-23T17:09:48Z
2023-02-23T17:09:48Z
2013
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
https://idus.us.es/handle//11441/142965
eng
Theoretical and Applied Climatology, 114 (3-4), 445-457.
CGL2009-10683
158 2010
https://doi.org/10.1007/s00704-013-0855-7
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Springer Nature
oai:idus.us.es:11441/1357092024-02-17T16:25:44Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Characterization and radioactive evaluation of the concrete from a radiotherapy bunker
Torres González, Marta
Mantero Cabrera, Juan
Hurtado Bermúdez, Santiago José
Flores Alés, Vicente
Alejandre Sánchez, Francisco Javier
Alducín Ochoa, Juan Manuel
Universidad de Sevilla. Departamento de Física Aplicada II
Barite concrete
Gamma spectrometry
Ground penetration radar
Radioactivity
The construction of concrete structures for radiological protection in sanitaryfacilities requires a series of constructive conditions that guarantee safety. Theinfluence of the correct bunkers design, wall thicknesses and the type of mate-rials used is essential to ensure effective protection. The use of barite aggregateconcrete is a common resource to improve the radiation attenuation capacityof concrete walls. The present study analyses the structure of a bunker duringa renovation work, studying the construction characteristics of the chamber,the state of its elements, the characterization of materials, the identification ofthe emissions of the possible isotopes present, beta radioactive contaminationand the measurement of equivalent dose rates at different points in the con-crete. The results made it possible to determine the use of conventional con-crete and barite concrete, the latter presenting a BaO content of around 40%and particularly low resistance values, not observing alteration processes inthe materials
2022-07-22T08:04:32Z
2022-07-22T08:04:32Z
2022
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135709
eng
Structural Concrete, 1-12.
https://doi.org/10.1002/suco.202100379
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Wiley
oai:idus.us.es:11441/1493072024-02-14T11:13:15Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Las medidas ideales y el problema de entender la mecánica cuántica
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Mecánica cuántica
Probabilidades
Uno de los problemas más antiguos de la física moderna es de dónde viene la mecánica cuántica. La observación de la importancia que tienen en Física las cantidades conservadas y los observables que se pueden medir repetidamente sin que su resultado cambie, nos lleva a preguntarnos cuál es la teoría de probabilidades más general posible para los eventos producidos por medidas de observables de este tipo. Aquí introducimos las definiciones y herramientas para demostrar que, sorprendentemente, esa teoría más general posible es la teoría cuántica de probabilidades.
2023-10-03T06:04:41Z
2023-10-03T06:04:41Z
2021
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/149307
spa
Revista española de física, 35 (2), 1-6.
US-15097
PCI2019-111885-2
http://revistadefisica.es/index.php/ref/article/view/2730/2198
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Real Sociedad Española de Física
oai:idus.us.es:11441/1531312024-02-14T20:04:57Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Experimental test of quantum correlations from Platonic graphs
Xiao, Ya
Xu, Zhen-Peng
Li, Qiang
Su, Hong-Yi
Sun, Kai
Cabello Quintero, Adán
Xu, Jin-Shi
Chen, Jing-Ling
Li, Chuan-Feng
Guo, Guang-Can
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
National Key Research and Development Program of China
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Anhui Initiative in Quantum Information Technologies
Chinese Academy of Sciences
Ministerio de Economía y Competitividad (MINECO). España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Quantum correlations
Platonic graphs
Graph theory
Great effort has been made in the investigation of contextual correlations between compatible observables due to their both fundamental and practical importance. The graph-theoretic approach to correlate events has been proved to be an effective method in the characterization of quantum contextuality, which implies that quantum violations of noncontextual inequalities derived in the noncontextual hidden-variable models should be achievable. Finding experimentally more friendly and theoretically more powerful noncontextual inequalities associated with specific graphs is of particular interest. Here we consider Platonic graphs to vindicate the quantum maximum predicted by graph theory and test the quantum violation against the mixedness of the state. Among these solids we refer particularly to the icosahedron to build the experiment, as it gives rise to the largest quantum-classical difference. The contextual correlations are demonstrated on quantum four-dimensional states encoded in the spatial modes of single photons generated from a defect in a bulk silicon carbide. Our results shed new light on the conflict between quantum and classical physics and may promote deep understanding of the connection between quantum theory, graph theory, and operator theory.
2024-01-10T08:38:21Z
2024-01-10T08:38:21Z
2018-05-29
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/153131
eng
Optica, 5 (6), 718-722.
2016YFA0302700
2017YFA0304100
11325419
11774335
61327901
61725504
11475089
WK2470000026
WK2470000020
AHY060300
AHY020100
QYZDYSSW-SLH003
FIS2014-60843-P
https://opg.optica.org/optica/fulltext.cfm?uri=optica-5-6-718&id=389962
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
Optica Publishing Group
oai:idus.us.es:11441/1357572024-02-15T07:27:39Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Partitioning and Availability of Metals from Water Suspended Sediments: Potential Pollution Risk Assessment
Cabral Lares, Magaly
Rentería Villalobos, Marusia
Mendieta Mendoza, Aurora
Ortíz Caballero, Ziury
Montero Cabrera, María Elena
Vioque Romero, Ignacio
Universidad de Sevilla. Departamento de Física Aplicada II
Chemical fractions
Suspended particulate matter
Metal release
Aquatic environment
Surface water
The water management initiatives in freshwater systems focus on water availability to preserve this resource for human uses and the health of aquatic ecosystems. This work presents an assessment of the potential pollution risk caused by the metal availability in suspended sediments. The objective of this study was to determine the partitioning, association, and geochemical fractionation of metals in suspended sediments from a surface water body. Additionally, the environmental assessment for this reservoir was estimated using geoaccumulation, enrichment, and pollution indices of metals and the related potential risk by their elemental availability (RAC). Chemical, mineralogical, and morphological characterizations were obtained by inductively coupled plasma spectrometry, alpha spectroscopy, X-ray crystallography, and scanning electron microscopy. Clay, quartz, montmorillonite, and calcite were the main minerals of suspended sediments. Chemical fractionation was the parameter affecting the concentrations of metals in suspended sediments. The sediment composition is of natural origin; however, these finer particles can promote the scavenging of toxic metals. It contributes to obtaining moderate to high levels for enrichment/contamination indices. Although Ca, Mg, and U were the most accessible metals for aquatic biota, metals such as Sr, Mn, Li, Cu, and Ni in the exchangeable phase of suspended sediments are the potentially toxic elements in this aquatic ecosystem.
2022-07-25T11:10:55Z
2022-07-25T11:10:55Z
2022
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/135757
eng
Water, 14 (6), 1-20.
https://doi.org/10.3390/w14060980
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
MDPI
oai:idus.us.es:11441/1446672024-02-17T17:15:02Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
Graph-theoretic approach for self-testing in Bell scenarios
Bharti, Kishor
Ray, Maharshi
Xu, Zhen Peng
Hayashi, Masahito
Kwek, Leong Chuan
Cabello Quintero, Adán
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Graph-Theoretic approach
Self-testing
Bell scenarios
Self-testing is a technology to certify states and measurements using only the statistics of the experiment. Self-testing is possible if some extremal points in the set BQ of quantum correlations for a Bell experiment are achieved, up to isometries, with specific states and measurements. However, BQ is difficult to characterize, so it is also difficult to prove whether or not a given matrix of quantum correlations
allows for self-testing. Here, we show how some tools from graph theory can help to address this problem. We observe that BQ is strictly contained in an easy-to-characterize set associated with a graph, (G). Therefore, whenever the optimum over BQ and the optimum over (G) coincide, self-testing can be demonstrated by simply proving self-testability with (G). Interestingly, these maxima coincide for the
quantum correlations that maximally violate many families of Bell-like inequalities. Therefore, we can apply this approach to prove the self-testability of many quantum correlations, including some that are not previously known to allow for self-testing. In addition, this approach connects self-testing to some open problems in discrete mathematics. We use this connection to prove a conjecture [M. Araújo et al., Phys.
Rev. A, 88, 022118 (2013)] about the closed-form expression of the Lovász theta number for a family of graphs called the Möbius ladders. Although there are a few remaining issues (e.g., in some cases, the proof requires the assumption that measurements are of rank 1), this approach provides an alternative method to self-testing and draws interesting connections between quantum mechanics and discrete mathematics.
2023-04-20T06:37:01Z
2023-04-20T06:37:01Z
2022-09-26
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/144667
eng
PRX Quantum, 3 (030344).
https://journals.aps.org/prxquantum/pdf/10.1103/PRXQuantum.3.030344
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai:idus.us.es:11441/1444512024-02-15T07:47:24Zcom_11441_10853com_11441_10802com_11441_10690col_11441_10854
General Bayesian theories and the emergence of the exclusivity principle
Chiribella, Giulio
Cabello Quintero, Adán
Kleinmann, Matthias
Müller, Markus P.
Universidad de Sevilla. Departamento de Física Aplicada II
Universidad de Sevilla. FQM239: Fundamentos de Mecánica Cuántica
Foundational Questions Institute
National Natural Science Foundation of China
Hong Kong Research Grant Council
Ministerio de Ciencia, Innovación y Universidades (MICINN). España
European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
General Bayesian theories
Quantum theory
Exclusivity principle
We address the problem of reconstructing quantum theory from the perspective of an agent who makes bets about the outcomes of possible experiments. We build a general Bayesian framework that can be used to organize the agent's beliefs and update them when new information becomes available. Our framework includes as special cases classical and quantum probability theory, as well as other forms of probabilistic reasoning that may arise in future physical theories. Building on this framework, we develop a notion of an ideal experiment, which in quantum theory coincides with the notion of projective measurement. We then prove that, in every general Bayesian theory, ideal experiments must satisfy the exclusivity principle, a property of projective measurements that plays a central role in the characterization of quantum correlations. Our result suggests that the set of quantum correlations may be completely characterized in terms of Bayesian consistency conditions.
2023-04-17T05:50:02Z
2023-04-17T05:50:02Z
2020-10-05
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
https://idus.us.es/handle//11441/144451
eng
Physical Review Research, 2 (042001).
FQXiRFP3-1325
11675136
17300317
FIS2017-89609-P
258647/GEDENTQOPT
https://journals.aps.org/prresearch/pdf/10.1103/PhysRevResearch.2.042001
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
American Physical Society
oai_dc///col_11441_10854/100