Search results for "Diode"
showing 10 items of 469 documents
Audiodescription et problématique de la traduction de contenus sexuels : le cas de La vie d’Adèle d’Abdellatif Kechiche
2018
L’audiodescription est une modalité émergente de traduction audiovisuelle dont l’objectif principal est de rendre accessible à des personnes malvoyantes ou non voyantes des films, de façon à ce qu’elles puissent comprendre et profiter du film comme un spectateur qui peut voir les images. Dans cet article, nous présentons une étude sur un sujet considéré tabou : la traduction d’images de contenu sexuel en mots. Dans un premier temps, nous avons identifié les scènes de contenu sexuel explicite dans le film français La vie d’Adèle (Kechiche, 2013). Nous avons analysé l’audiodescription qui les accompagne et déterminé les stratégies traductologiques utilisées pour le faire. Nous avons observé d…
Luminiscences pētījumi ar diviem retzemju joniem aktivētos oksifluorīdu stiklos un stikla keramikās
2015
Baltās gaismas LED lampas ir ļoti aktuāls pētījumu objekts- tiek meklētas labākās izgatavošanas tehnoloģijas un veiksmīgākais luminoforu sastāvs. Svarīgi ir ne tikai iegūt baltu gaismu, bet arī nodrošināt augstu gaismas kvalitāti. Kā perspektīvi luminoforu materiāli tiek minēti ar retzemju joniem aktivēti oksiflorīdu stikli un stikla keramikas, jo šiem materiāliem piemīt labas mehāniskās un optiskās īpašības. Literatūras apskatā sniegta informācija par luminiscences mehānismu, baltās gaismas LED diožu ražošanas tehnikām un gaismas avotu krāsas raksturlielumiem, kā arī, apskatīti oksifluorīdu materiāli un retzemju jonu vispārīgās un luminiscences īpašības. Darba praktiskajā daļā izgatavoti a…
Ar eiropiju un disproziju koaktivētu oksifluorīdu stiklu luminiscence
2016
Baltās gaismas diodes ir aktuāls pētniecības virziens apgaismes tehnoloģiju attīstībā. Pēdējos gados par aktuālu pētniecības virzienu ir kļuvusi ar retzemju joniem aktivētu oksifluorīdu stiklu un stikla keramiku materiālu pētniecība. Dotie materiāli ir perspektīvi baltās gaismas luminofori, jo tiem piemīt labas optiskās, ķīmiskās un mehāniskās īpašības. Darbā tiek veikti ar Eu3+ un Dy3+ joniem aktivētu oksifluorīdu stiklu spektroskopiskie pētījumi, ar mērķi izpētīt doto jonu savstarpējo mijiedarbību caur enerģijas pārnesi, kas ļautu novērtēt dotā materiāla kā baltās gaismas luminofora izstrādes iespējas. Literatūras apskatā tiek apskatīti luminiscences mehānisma principi, retzemju elementi …
Energy conversion efficiency in betavoltaic cells based on the diamond Schottky diode with a thin drift layer
2020
The HPHT diamond Schottky diode was assembled as a Metal/Intrinsic/p-doped structure betavoltaic cell (BC) with a very thin (1 μm) drift layer and tested under 5–30 keV electron beam irradiation using a scanning electron microscope (SEM). The effect of the β-radiation energy and the backscattering of electrons on the energy conversion was studied. From the results obtained, it is shown that, the efficiency of the investigated BC increases from 1.01 to 3.75% with the decrease of β-particle energy from 30 to 5 keV due to an increase of the electron beam absorption in a thin drift layer. Maximum efficiency is achieved when the electron beam energy is close to the average β-decay energy of 3H. …
Photobiomodulation Therapy in the Management of Burning Mouth Syndrome: Morphological Variations in the Capillary Bed
2020
Burning mouth syndrome (BMS) is an idiopathic condition that manifests itself primarily with the onset of a burning sensation. The aim of this research was to perform photobiomodulation therapy (PBM) using a diode laser on the oral mucosa of BMS patients, followed by an objective evaluation of the morphological changes in the vascular bed underlying the mucosa using polarized light videocapillaroscopy. A group of 40 patients were included in the study. The patients were randomly divided into two groups (using simple randomization) as follows: 20 patients were assigned to the laser group and 20 patients were assigned to the placebo group. Each patient of the laser group received eight irradi…
Design and development of a fNIRS system prototype based on SiPM detectors
2014
Functional Near Infrared Spectroscopy (fNIRS) uses near infrared sources and detectors to measure changes in absorption due to neurovascular dynamics in response to brain activation. The use of Silicon Photomultipliers (SiPMs) in a fNIRS system has been estimated potentially able to increase the spatial resolution. Dedicated SiPM sensors have been designed and fabricated by using an optimized process. Electrical and optical characterizations are presented. The design and implementation of a portable fNIRS embedded system, hosting up to 64 IR-LED sources and 128 SiPM sensors, has been carried out. The system has been based on a scalable architecture whose elementary leaf is a flexible board …
Novel zero-current-transition circuit for three-phase buck rectifiers
2002
ZCT circuits have already been proposed in the past and are becoming more and more popular in high power rectifiers and inverters where bipolar devices have to be used (IGBTs or even BJTs). Although ZCT techniques have already been applied to three-phase boost type topologies, no ZCT circuits have been proposed for three-phase buck-type topologies. The authors propose a new load independent ZCT circuit for a three-phase buck-type rectifier which achieves high noise reduction, voltage stress reduction and zero current transitions to almost all transitions of the rectifier's switches including the additional auxiliary switches.
Physically-consistent parameterization in the modeling of solar photovoltaic devices
2011
This research tests the standard one-diode model of a crystalline-Si photovoltaic cell, focusing on the physical accuracy. In particular, the (apparent) shunt resistance and the diode ideality factor are studied. Current-voltage characteristics of illuminated crystalline-Si photovoltaic modules are analyzed, and some limits of applicability of the standard model are given. Typical values of the ideality factor for crystalline-Si devices are derived from own experimental data as well as from recently published literature. It is shown that the contribution of the apparent shunt resistance is only significant for cell voltages below about 0.45 V, and depends on irradiance. This result is consi…
Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review
2022
This paper reviews the state-of-the-art technologies, characterizations, materials (precursors and encapsulants), and challenges concerning multicolor and white light-emitting diodes (LEDs) based on carbon dots (CDs) as color converters. Herein, CDs are exploited to achieve emission in LEDs at wavelengths longer than the pump wavelength. White LEDs are typically obtained by pumping broad band visible-emitting CDs by an UV LED, or yellow–green-emitting CDs by a blue LED. The most important methods used to produce CDs, top-down and bottom-up, are described in detail, together with the process that allows one to embed the synthetized CDs on the surface of the pumping LEDs. Experimental results…
Inverted Solution Processable OLEDs Using a Metal Oxide as an Electron Injection Contact.
2007
A new type of bottom-emission electroluminescent device is described in which a metal oxide is used as the electron-injecting contact. The preparation of such a device is simple. It consists of the deposition of a thin layer of a metal oxide on top of an indium tin oxide covered glass substrate, followed by the solution processing of the light-emitting layer and subsequently the deposition of a high-workfunction (air-stable) metal anode. This architecture allows for a low-cost electroluminescent device because no rigorous encapsulation is required. Electroluminescence with a high brightness reaching 5700 cd m–2 is observed at voltages as low as 8 V, demonstrating the potential of this new a…