Ponencias (Instituto de Ciencia de Materiales de Sevilla (ICMS) – CIC Cartuja)
URI permanente para esta colecciónhttps://hdl.handle.net/11441/10966
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Ponencia Vapor and liquid optical monitoring with sculptured Bragg microcavities(SPIE - The International Society for Optical Engineering, 2017) Oliva Ramírez, Manuel; Gil Rostra, Jorge; López Santos, Carmen; Rodríguez González-Elipe, Agustín; Yubero Valencia, Francisco; Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear; Universidad de Sevilla. Departamento de Física Aplicada I; Ministerio de Economia, Industria y Competitividad (MINECO). España; Agencia Estatal de Investigación. EspañaSculptured porous Bragg Microcavities (BMs) formed by the successive stacking of columnar SiO2 and TiO2 thin films with zig-zag columnar microstructure are prepared by glancing angle deposition. These BMs act as wavelength dependent optical retarders. This optical behavior is attributed to a self-structuration mechanism involving a fence-bundling association of nanocolumns as observed by Focused Ion Beam Scanning Electron Microscopy. The retardance of these optically active BMs can be modulated by dynamic infiltration of their open porosity with vapors, liquids or solutions with different refractive indices. The tunable birefringence of these nanostructured photonic systems have been successfully simulated with a simple model that assumes that each layer within the BMs stack has uniaxial birefringence. This type of self-associated nanostructures has been incorporated to microfluidic chips for free label vapor and liquid sensing. Several examples of the detection performance of these chips, working either in reflection or transmission configuration, for the optical characterization of vapor and liquids of different refractive index and aqueous solutions of glucose flowing through the microfluidic chips are described.Ponencia The EKV/ACM compact models for mismatch modeling down to 90nm and for new emergent non-CMOS nanotechnology FETs(2010) Serrano Gotarredona, María Teresa; Linares Barranco, Bernabé; Universidad de Sevilla. Departamento de Arquitectura y Tecnología de ComputadoresPonencia RTD based logic circuits using generalized threshold gates(2008) Pettenghi Roldán, Héctor; Avedillo de Juan, María José; Quintana Toledo, José María; Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo; Gobierno de España; Junta de AndalucíaMany logic circuit applications of Resonant Tunneling Diodes are based on the MOnostable-BIstable Logic Element (MOBILE). Threshold logic is a computational model widely used in the design of MOBILE circuits, i.e. these circuits are built from threshold gates (TGs). The MOBILE realization of generalized threshold gates is being investigated. Multi-Threshold Threshold Gates (MTTGs) have been proposed which further increase the functionality of the original TGs. Recently, we have proposed a novel MOBILE circuit topology obtained by fundamental properties of threshold functions. This paper describes the design of n-bit adders using these novel MOBILE circuit topologies. A comparison with designs based on TGs and MTTGs is carried out showing advantages in terms of speed and power delay product and device counts.Ponencia On-site forest fire smoke detection by low-power autonomous vision sensor(2010) Fernández Berni, Jorge; Carmona Galán, Ricardo; Carranza González, Luis; Cano Rojas, Alberto; Martínez Carmona, Juan F.; Rodríguez Vázquez, Ángel Benito; Morillas Castillo, Sergio; Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo; Ministerio de Ciencia e Innovación (MICIN). EspañaEarly detection plays a crucial role to prevent forest fires from spreading. Wireless vision sensor networks deployed throughout high-risk areas can perform fine-grained surveillance and thereby very early detection and precise location of forest fires. One of the fundamental requirements that need to be met at the network nodes is reliable low-power on-site image processing. It greatly simplifies the communication infrastructure of the network as only alarm signals instead of complete images are transmitted, anticipating thus a very competitive cost. As a first approximation to fulfill such a requirement, this paper reports the results achieved from field tests carried out in collaboration with the Andalusian Fire-Fighting Service (INFOCA). Two controlled burns of forest debris were realized (www.youtube.com/user/vmoteProject). Smoke was successfully detected on-site by the EyeRISTM v1.2, a general-purpose autonomous vision system, built by AnaFocus Ltd., in which a vision algorithm was programmed. No false alarm was triggered despite the significant motion other than smoke present in the scene. Finally, as a further step, we describe the preliminary laboratory results obtained from a prototype vision chip which implements, at very low energy cost, some image processing primitives oriented to environmental monitoring.Ponencia Semi-empirical model of MOST and passive devices focused on narrowband RF blocks(2012) Fiorelli, Rafaella; Silveira Noguerol, Fernando; Rueda Rueda, Adoración; Peralías Macías, Eduardo; Universidad de Sevilla. Departamento de Electrónica y ElectromagnetismoThis paper presents a semi-empirical modeling of MOST and passive elements to be used in narrowband radiofrequency blocks for nanometer technologies. This model is based on a small set of look-up tables (LUTs) obtained via electrical simulations. The MOST description is valid for all-inversion regions of MOST and the data is extracted as function of the gm=ID characteristic; for the passive devices the LUTs include a simplified model of the element and its principal parasitic at the working frequency f0. These semi-empirical models are validated by designing a set of 2.4-GHz LNAs and 2.4-GHz and 5-GHz VCOs in three different MOST inversion regions.Ponencia Regression modeling for digital test of ΣΔ modulators(2010) Léger, Gildas; Rueda Rueda, Adoración; Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo; Ministerio de Educación y Ciencia (MEC). España; Junta de AndalucíaThe cost of Analogue and Mixed-Signal circuit testing is an important bottleneck in the industry, due to timeconsuming verification of specifications that require state-ofthe- art Automatic Test Equipment. In this paper, we apply the concept of Alternate Test to achieve digital testing of converters. By training an ensemble of regression models that maps simple digital defect-oriented signatures onto Signal to Noise and Distortion Ratio (SNDR), an average error of 1:7% is achieved. Beyond the inference of functional metrics, we show that the approach can provide interesting diagnosis information.Ponencia Metodologia orientada a la elección de FPGAs con prioridad en el consumo de potencia(2010) Mora Gutiérrez, José Miguel; Sassaw Teshome, G.; Jiménez Fernández, Carlos Jesús; Valencia Barrero, Manuel; Universidad de Sevilla. Departamento de Tecnología Electrónica; Ministerio de Educación y Ciencia (MEC). España; Junta de AndalucíaEn este trabajo se presenta una metodología de diseño orientada a explorar el cada vez más amplio conjunto de FPGAs con el fin de seleccionar la mejor opción. Los parámetros que se utilizan para realizar la exploración son los recursos consumidos, la frecuencia de operación y el consumo de potencia. Sobre este último parámetro, el más difícil de medir, se hace un especial énfasis. Se exploran dos fabricantes (Altera y Xilinx), dos familias diferentes de cada fabricante y dos subfamilias dentro de cada familia, una de la gama alta y otra de la gama baja. Esta exploración se ha realizado implementando dos circuitos que realizan la operación división de números de 64 bits usando dos algoritmos con plena vigencia.Ponencia Estudio científico de los libros de coro de la abadía del sacromonte de Granada(Universidad de Sevilla, 1999) Martínez Blanes, José María; Bueno-Vargas, Javier; Pérez Rodríguez, José Luis; Universidad de Sevilla. Departamento de Pintura; Instituto de Ciencia de Materiales de Sevilla (ICMS) – CIC CartujaEl objetivo de esta comunicación es dar a conocer el estudio científico que se está realizando sobre el más de medio centenar de los Libros de Coro reali zados en pergamino, expresamente para esta institución, entre los ss. XVII al XX que se encuentran en la Abadía del Sacromonte en Granada. Se efectúa una pe queña introducción histórica de lo que es la Abadía y su localización. A conti nuación .se describen los libros estudiados (tipologías y características generales) y sobre todo de las miniaturas con las que están decorados algunos de ellos.