Física Aplicada: Enviaments recents
Ara mostrant els elements 281-300 de 556
Connecting flash flood events with radar-derived convective storm characteristics on the northwestern Mediterranean coast: knowing the present for better future scenarios adaptation
The northwestern Mediterranean coast is one of the areas most affected by flash floods and adverse weather, where also global climate scenarios are predicting an increase in precipitation extremes. This, along with the ...
Technological solution for the automatic replacement of the catalytic filaments in HWCVD
The degradation of the catalytic filaments is the main factor limiting the industrial implementation of the hot wire chemical vapor deposition (HWCVD) technique. Up to now, no solution has been found to protect the catalytic ...
Production of nanometric particles in radio frequency glow discharges in mixtures of silane and methane
The formation of silicon particles in rf glow discharges has attracted attention due to their effect as a contaminant during film deposition or etching. However, silicon and silicon alloy powders produced by plasma¿enhanced ...
Diffraction theory of Fresnel lenses encoded in low-resolution devices
A mathematical model that describes the behavior of low-resolution Fresnel lenses encoded in any low-resolution device (e.g., a spatial light modulator) is developed. The effects of low-resolution codification, such the ...
Real-time monitoring of the silicidation process of tungsten filaments at high temperature used as catalysers for silane decomposition
The scope of this work is the systematic study of the silicidation process affecting tungsten filaments at high temperature (1900ºC) used for silane decomposition in the hot-wire chemical vapour deposition technique (HWCVD). ...
Mueller matrix polarimetry with 3D integral imaging
In this paper, we introduce the Mueller matrix imaging concepts for 3D Integral Imaging Polarimetry. The Mueller matrix of a complex scene is measured and estimated with 3D integral imaging. This information can be used ...
Relaxation and derelaxation of pure and hydrogenated amorphous silicon during thermal annealing experiments
The structural relaxation of pure amorphous silicon a-Si and hydrogenated amorphous silicon a-Si:H materials, that occurs during thermal annealing experiments, has been analyzed by Raman spectroscopy and differential ...
Nonlinear filtering in object and Fourier space in a joint transform optical correlator: comparison and experimental realization
The use of different kinds of nonlinear filtering in a joint transform correlator are studied and compared. The study is divided into two parts, one corresponding to object space and the second to the Fourier domain of the ...
Optimization of KOH etching process to obtain textured substrates suitable for heterojunction solar cells fabricated by HWCVD
In this work, we have studied the texturization process of (100) c-Si wafers using a low concentration potassium hydroxide solution in order to obtain good quality textured wafers. The optimization of the etching conditions ...
Elaboració d'una base de dades per a l'autoformació i autoavaluació de coneixements i competències en estudis científics superiors
L'objectiu principal és oferir uns recursos educatius multimèdia (en format HTML i JAVA) utilitzables en línea (Internet) o en suport autònom (CD-ROM) per a l'autoformació i l'autoevaluació ...
Is temperature reducing the transmission of COVID-19?
The first confirmed case of SARS-CoV-2 in the city of Barcelona, Spain, was identified on February 25th, 2020. Since then, the epidemic spread countrywide, and Spain has become the second most affected country worldwide ...
Observation of room temperature photoluminescence from asymmetric CuGaO2/ZnO/ZnMgO multiple quantum well structures
Asymmetric (CuGaO2/ZnO/ZnMgO) and symmetric (ZnMgO/ZnO/ZnMgO) multiple quantum well (MQW) structures were successfully fabricated using pulsed laser deposition (PLD) and their comparison were made. Efficient room temperature ...
Correlador óptico controlado mediante una sola tarjeta digitalizadora de 8 bits
En este trabajo analizamos diferentes aspectos referentes a la construcción de un correlador óptico de VanderLugt. El montaje está diseñado para mostrar las imágenes en dos pantallas de cristal líquido, una en el plano de ...
Ellipsometric study of a-Si:H thin films deposited by square wave modulated rf glow discharge
Thin films of hydrogenated amorphous silicon (a‐Si:H), deposited by square wave modulated (SQWM) rf silane discharges, have been studied through spectroscopic and real time phase modulated ellipsometry. The SQMW films ...
Controlled-intensity detection peaks in a binary joint transform correlator
In multiobject pattern recognition the height of the correlation peaks should be controlled when the power spectrum of ajoint transform correlator is binarized. In this paper a method to predetermine the value of detection ...
Heteroepitaxial growth of MgO(111) thin films on Al2O3(0001): Evidence of a wurtzite to rocksalt transformation
We report on a growth study of MgO films deposited on Al2O3(0001) substrates by magnetron sputtering. The films exhibited a preferred rocksalt MgO(111) orientation. Surprisingly, depending on the O2 gas flow ratio, a ...
Study of post-deposition contamination in low-temperature deposited polysilicon films
The presence of hydrogen in polysilicon films obtained at low temperatures by hot-wire CVD and the post-deposition oxidation by air-exposure of the films are studied in this paper. The experimental results from several ...
Full complex Fresnel holograms displayed on liquid cristal devices
We propose an implementation to display full complex information using two ferroelectric liquid crystals spatial light modulators. We compare the simulated and experimental results obtained.
Time-resolved imaging of the laser forward transfer of liquids
Time-resolved imaging is carried out to study the dynamics of the laser-induced forward transfer of an aqueous solution at different laser fluences. The transfer mechanisms are elucidated, and directly correlated with the ...
High-impact floods and flash floods in mediterranean countries: the FLASH preliminary database
This paper contains a preliminary analysis of flood risk in Mediterranean countries, conducted within the framework of the FLASH European Project. All flood events recorded between 1990 and 2006 in the Mediterranean region ...
