Buscar
Mostrando ítems 1-10 de 22
Artículo
The Zanclean megaflood of the Mediterranean – Searching for independent evidence
(Elsevier, 2020)
About six million years ago, the Mediterranean Sea underwent a period of isolation from the ocean and widespread salt deposition known as the Messinian Salinity Crisis (MSC), allegedly leading to a kilometer-scale level ...
Artículo
Cross-Polarization Control in FSSs by Means of an Equivalent Circuit Approach
(IEEE Computer Society, 2021)
This paper presents an efficient equivalent circuit approach (ECA), based on a Floquet modal expansion, for the study of the co- and cross-polarization in frequency selective surfaces (FSS) formed by periodic arrays of ...
Artículo
Nonlinear bandgap transmission by discrete rogue waves induced in a pendulum chain
(ScienceDirect, 2024-02-15)
Westudynumerically a discrete, nonlinear lattice, which is formed by a chain of pendula submitted to a harmonic-driving source with constant amplitude and parametrical excitation. A supratrans mission phenomenon is obtained ...
Artículo
Wave Propagation in Periodic Metallic Structures with Equilateral Triangular Holes
(MDPI, 2020)
This paper studies wave propagation in a periodic parallel-plate waveguide with equilateral triangular holes. A mode-matching method is implemented to analyze the dispersion diagram of the structure possessing glide and ...
Artículo
Environmental conditions and geomorphologic changes during the Middle–Upper Paleolithic in the southern Iberian Peninsula
(Elsevier, 2013)
This study utilizes geomorphology, marine sediment data, environmental reconstructions and the Gorham's Cave occupational record during the Middle to Upper Paleolithic transition to illustrate the impacts of climate changes ...
Artículo
Exploring the potentials of the multi-modal equivalent circuit approach for stacks of 2-D aperture arrays
(IEEE Computer Society, 2021)
Many frequency-selective surface (FSS) structures are based on the use of a single periodic array of slot/apertures in a conducting sheet embedded in a layered medium. However, it is well known that stacking several ...
Artículo
Study of forward and backward modes in double-sided dielectric-filled corrugated waveguides
(MDPI, 2021)
This work studies the propagation characteristics of a rectangular waveguide with aligned/ misaligned double-sided dielectric-filled metallic corrugations. Two modes are found to propagate in the proposed double-sided ...
Artículo
On the Benefits of Glide Symmetries for Microwave Devices
(IEEE Computer Society, 2021)
The presence of glide symmetries in periodic structures can introduce beneficial modifications in their electromagnetic properties. The difference between glide and non-glide periodic structures is due to the distinctive ...
Artículo
A comparison of 210Pbxs, 137Cs, and Pu isotopes as proxies of soil redistribution in South Spain under severe erosion conditions
(Springer, 2023-06-01)
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 ...
Artículo
The behaviour of I-129 released from nuclear fuel reprocessing factories in the North Atlantic Ocean and transport to the Arctic assessed from numerical modelling
(Elsevier, 2015)
A quantitative evaluation of the fate of 129I, released from the European reprocessing plants of Sellafield (UK) and La Hague (France), has been made by means of a Lagrangian dispersion model. Transport of radionuclides ...