Search results for "621.3"
showing 10 items of 25 documents
Use of acousto-Optic Filters in imaging applications. A contribution to the SmartSpectra project
2009
This Thesis analyses the use of an acousto-optic tunable filter (AOTF) for the realisation of spectral imaging systems. An AOTF is an electronically tunable spectral bandpass optical filter. It consists on a crystal that, excited with acoustic waves, diffracts and then separates a single wavelength of light from a broadband source. The wavelength of selected light is a function of the frequency of the signal applied to the crystal. We have implemented a spectral imaging instrument called Autonomous Tunable Filtering System (ATFS) that includes an AOTF in order to acquire multispectral images with a monochrome digital camera. Careful design and calibration permits its use in spectroscopic ap…
Detección automática de podredumbres en cítricos mediante procesado avanzado de imágenes hiperespectrales
2010
La citricultura constituye actualmente una parte importantísima de la economía en la Comunidad Valenciana. Uno de los principales problemas presentes en la industria citrícola son las podredumbres producidas por los hongos Penicillium digitatum y Penicillium italicum. La detección temprana del daño producido por los hongos en los cítricos es especialmente importante para la industria distribuidora de cítricos, ya que un reducido número de frutas infectadas puede diseminar la infección a toda una partida de cítricos, produciendo grandes pérdidas económicas. Actualmente en la industria citrícola la inspección y eliminación de cítricos dañados por podredumbres se realiza de manera manual por o…
El monogramista F.D.V. ¿Frans de Vriendt? A propósito de una Susana y los viejos firmada y fechada en 1543
2017
En este artículo analizamos una pintura flamenca inédita, que representa la escena de Susana y los viejos. Se conserva en una colección particular de Cartagena (Murcia). Está fechada en 1543 y firmada por F.D.V., monograma que plantea la principal incógnita de nuestra investigación. Tales siglas hacen pensar de inmediato en el pintor Frans Floris de Vriendt. En este sentido, los rasgos estilísticos de la obra están próximos al espíritu de este maestro. Sin embargo, diversas cuestiones nos impiden confirmar por el momento tal autoría. En el texto desarrollamos estas hipótesis y definimos la personalidad artística del que denominamos Monogramista F.D.V. In this paper, we analyze an unpublishe…
Experimental Study of the Multipactor Effect in a Partially Dielectric-Loaded Rectangular Waveguide
2019
This letter presents the experimental study of the multipactor threshold in a partially dielectric-loaded rectangular waveguide, whose results validate a multipactor model recently developed by the authors, which includes the charge distribution appearing on the dielectric surface during the multipactor discharge. First, the variation of the multipactor RF voltage threshold has been theoretically analyzed in different waveguide configurations: in an empty waveguide, and also in the cases of a one-sided and two-sided dielectric-loaded waveguides. To reach this aim, an in-house Monte Carlo simulation tool has been developed. The Secondary Electron Yield (SEY) of the metallic and dielectric ma…
Analysis of Multipactor Effect in a Partially Dielectric-Loaded Rectangular Waveguide
2019
This paper 1 presents a study of the multipactor 2 effect in a partially dielectric-loaded rectangular waveguide. 3 To obtain the simulations presented in this paper, a detailed 4 analysis of the dynamics of the electron inside this waveguide 5 has been performed, taking into account the radio frequency 6 electromagnetic fields propagating in the waveguide and the dc 7 electric field that appears because of the charging of the dielectric 8 layer. This electrostatic field is obtained by computing the electric 9 potential produced by an arbitrary charge distribution on the 10 dielectric layer in a dielectric-loaded waveguide. The electron 11 trajectory is then found by numerically solving the…
Rapid parameter estimation of discrete decaying signals using autoencoder networks
2021
Machine learning: science and technology 2(4), 045024 (2021). doi:10.1088/2632-2153/ac1eea
Consistent device simulation model describing perovskite solar cells in steady-state, transient, and frequency domain
2019
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/10.1021/acsami.9b04991