Browsing by Subject "Òptica física"
Now showing items 1-20 of 32
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Analysis of the chicken retina with an adaptive optics multiphoton microscope
(2011-06-01)
Article
Restricted access - publisher's policyThe structure and organization of the chicken retina has been investigated with an adaptive optics multiphoton imaging microscope in a backward configuration. Non-stained flat-mounted retinal tissues were imaged at ... -
Anàlisi i comparació d'aplicacions (apps) per al control de la llum blava dels dispositius electrònics
(Universitat Politècnica de Catalunya, 2016-06-01)
Bachelor thesis
Open AccessEn la nostra societat actual, l’ús de dispositius electrònics com els mòbils, tauletes, ordinadors o televisors, tots ells amb pantalles on es visualitzen les dades, ocupa moltes hores del temps laboral i d'oci de bona ... -
Análisis de antenas de reflector mediante procesado gráfico
(Universidad de Valladolid, 1995)
Conference report
Open AccessThe aim of this article is to show a new technique for calculating the Radiation Pattern of arbitrary geometry reflector antennas. We use the Graphical processing technique developed in this group for Radar Cross Section ... -
Aportación a la óptica de Robert Hooke
(PUNTEX, 1988-03)
Article
Open AccessLa figura de Robert Hooke se nos ofrece como la personificación del espíritu de investigación y la fidelidad al método científico experimental del siglo XVII. Vinculado a los más sobresalientes hombres de ciencia ingleses ... -
Balanced tangential testing for the nonconforming discretization of the Electric-Field Integral Equation on open PeC surfaces
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference report
Restricted access - publisher's policyRecent attention has been devoted to the development of nonconforming implementations of the Electric-Field Integral Equation (EFIE), which impose no continuity constraints in the expansion of the current between ... -
Bias-dependence of FET intrinsic noise sources, determined with a quasi-2D model
(JOHN WILEY & SONS INC, 2003-11-30)
Article
Open AccessThe bias-dependence of microwave-FET intrinsic noise sources in their hybrid configuration is theoretically determined, using a new quasi-2D (Q-2D) physical model based on Thornber's current equation [8]. It is shown that ... -
Codificación de la función de fase de una lente compuesta multifocal presentada por un modulador LCoS
(2009)
Conference lecture
Restricted access - publisher's policy -
Diffraction control in P T -symmetric photonic lattices: from beam rectification to dynamic localization
(2016-01-21)
Article
Open AccessWe address the propagation of light beams in longitudinally modulated PT-symmetric lattices, built as arrays of couplers with periodically varying separation between their channels, and show a number of possibilities for ... -
Direction-sensitive transverse velocity measurement by phase-modulated structured light beams
(2014-09-15)
Article
Restricted access - publisher's policyThe use of structured light beams to detect the velocity of targets moving perpendicularly to the beam's propagation axis opens new avenues for remote sensing of moving objects. However, determining the direction of motion ... -
Directionality fields generated by a local Hilbert transform
(American Physical Society, 2018-03-15)
Article
Open AccessWe propose an approach based on a local Hilbert transform to design non-Hermitian potentials generating arbitrary vector fields of directionality, ¿p(¿r), with desired shapes and topologies. We derive a local Hilbert ... -
Disseny d'una eina didàctica per a l'estudi de fenòmens òptics
(Universitat Politècnica de Catalunya, 2007-01-10)
Master thesis (pre-Bologna period)
Open Access -
Edge diffraction computation using GRECO
(Institute of Electrical and Electronics Engineers (IEEE), 2016)
Conference report
Restricted access - publisher's policyThis paper addresses two graphical processing approaches for computation of edge scattering with Physical Theory of Diffraction (PTD) high-frequency approximation. One is based on processing only a bitmap containing an ... -
GRECO-SAR: An Orbital Polarimetric SAR Simulator of Deterministic Complex Targets for Vessel Classification Studies
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2006-12-31)
Article
Open AccessThis paper presents a synthetic aperture radar (SAR) simulator that is able to generate polarimetric SAR (POLSAR) and polarimetric inverse SAR data of complex targets. It solves the electromagnetic problem via high-frequency ... -
High frequency RCS graphical processing
(1990)
Conference report
Open AccessThe results presented at this workshop have been obtained with a new and original approach: hardware graphical processing. High-frequency RCS of complex radar targets is computed in real time using a 3-D graphic workstation. ... -
High harmonic generation in AlN due to out-of-surface electron orbitals
(Optical Society of American (OSA), 2021-01-15)
Article
Open AccessHigh harmonic generation in solids is commonly considered as a bulk process. However, there is a controversy whether the experimentally observed effects can in their entirety be described by a pure bulk model. Our results ... -
High-power, continuous-wave optical parametric oscillators from visible to near-infrared
(Universitat Politècnica de Catalunya, 2009-07-01)
Doctoral thesis
Open AccessThis thesis presents the development of a new class of high-power, continuous-wave (cw) optical parametric oscillators (OPOs) with extended tunability from visible to near-infrared (near-IR). While lasers have been in use ... -
Image encryption system based on a nonlinear joint transform correlator for the simultaneous authentication of two users
(2019-01-01)
Article
Open AccessWe propose a new encryption system based on a nonlinear joint transform correlator (JTC) using the information of two biometrics (one digital fingerprint for each user) as security keys of the encryption system. In order ... -
Image formation with lenses, pinholes and slits in an optical box
(Hands-on Science Network, 2023)
Conference lecture
Restricted access - publisher's policyImages formed by systems with small apertures, such as pinholes and slits, have very weak illumination. It is advisable an object with a high luminance and with considerable size to see these images. Besides, the device ... -
Images encryption system based on a fractional joint transform correlator and nonlinear filtering
(2014)
Article
Open AccessA new optical security system for image encryption based on a fractional joint transform correlator and nonlinear filtering is proposed. The position of the lens in the proposed optical encryption setup can be chosen, so ... -
Light dynamics in glass-vanadium dioxide nanocomposite waveguides with thermal nonlinearity
(2009-04)
Article
Open AccessWe address the propagation of laser beams in SiO2–VO2 nanocomposite waveguides with thermo-optical nonlinearity. We show that the large modifications of the absorption coefficient as well as notable changes of the ...
