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 Ramirez, 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 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 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.