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Nomenclatura Unesco > (22) Física > (2203) Electrónica > (2203.02) Elementos de circuitos

Categorías relacionadas:
(3307.03) Diseño de circuitos

Mostrando recursos 1 - 20 de 575

1. Sistema de iluminación animada en un cubo de LEDs - MORA MORCILLO, ANDRÉS; SÁNCHEZ CHAMORRO, JEFFERSON DAVID
El proyecto de 'Desarrollo de un dispositivo visual animado basado en el LEDs' o 'animacubo' consiste en el diseño y construcción de un circuito que controlará un cubo de LEDs de 4x4x4 (64 LEDs) conectados entre sí. Un microcontrolador será el elemento del circuito encargado de almacenar el código recibido del PC a través de un dispositivo que conectara el cubo con este y posteriormente ejecutarlo para la animación de los LEDs. Nuestra idea es crear un dispositivo capaz de realizar una gran variedad de animaciones que posteriormente puedan ser utilizados en carteles luminosos para negocios, lugares de ocio, o...

2. ABOUT TRACK CIRCUIT CALCULATION METHOD DEPENDENT ON FERROMAGNET PROPERTIES IN CONDITIONS OF TRACTION CURRENT NOISE INFLUENCE - A. Yu. Zhuravlev
Purpose. The work is intended to investigate the electromagnetic processes in impedance bond in order to improve noise immunity of track circuits (TC) for safe railway operation. Methodology. To achieve this purpose the methods of scientific analysis, mathematical modelling, experimental study, a large-scale simulation were used. Findings. The work examined the interference affecting the normal performance of track circuits. To a large extent, part of track circuit damages account for failures in track circuit equipment. Track circuit equipment is connected directly to the track line susceptible to traction current interference, which causes changes in its electrical characteristics and electromagnetic properties....

3. Estudo dos efeitos de single event transients em conversor AD SAR do tipo redistribuição de carga - Becker, Thales Exenberger
Os conversores A/D baseados em aproximações sucessivas - SAR - do tipo redistribuição de carga são largamente utilizados nas mais diversas aplicações, principalmente naquelas que uma boa velocidade de conversão e o baixo dispêndio de energia e de área são determinantes. Este tipo de conversor está presente igualmente em diversos circuitos integrados e em dispositivos eletrônicos comerciais que, por vezes, são utilizados em ambientes adversos, como, por exemplo, aplicações espaciais. Nessa situação tal conversor está vulnerável a colisão de partículas, provenientes da radiação, capazes de ionizar o silício. A partir dessa interação, pulsos de corrente transientes podem surgir em determinados...

4. A Novel Field-Circuit FEM Modeling and Channel Gain Estimation for Galvanic Coupling Real IBC Measurements - Yue-Ming Gao; Zhu-Mei Wu; Sio-Hang Pun; Peng-Un Mak; Mang-I Vai; Min Du
Existing research on human channel modeling of galvanic coupling intra-body communication (IBC) is primarily focused on the human body itself. Although galvanic coupling IBC is less disturbed by external influences during signal transmission, there are inevitable factors in real measurement scenarios such as the parasitic impedance of electrodes, impedance matching of the transceiver, etc. which might lead to deviations between the human model and the in vivo measurements. This paper proposes a field-circuit finite element method (FEM) model of galvanic coupling IBC in a real measurement environment to estimate the human channel gain. First an anisotropic concentric cylinder model of...

5. GATA Factor-G-Protein-Coupled Receptor Circuit Suppresses Hematopoiesis - Gao, Xin; Wu, Tongyu; Johnson, Kirby D.; Lahvic, Jamie L.; Ranheim, Erik A.; Zon, Leonard I.; Bresnick, Emery H.
Summary Hematopoietic stem cells (HSCs) originate from hemogenic endothelium within the aorta-gonad-mesonephros (AGM) region of the mammalian embryo. The relationship between genetic circuits controlling stem cell genesis and multi-potency is not understood. A Gata2 cis element (+9.5) enhances Gata2 expression in the AGM and induces the endothelial to HSC transition. We demonstrated that GATA-2 rescued hematopoiesis in +9.5−/− AGMs. As G-protein-coupled receptors (GPCRs) are the most common targets for FDA-approved drugs, we analyzed the GPCR gene ensemble to identify GATA-2-regulated GPCRs. Of the 20 GATA-2-activated GPCR genes, four were GATA-1-activated, and only Gpr65 expression resembled Gata2. Contrasting with the paradigm...

6. GATA Factor-G-Protein-Coupled Receptor Circuit Suppresses Hematopoiesis - Xin Gao; Tongyu Wu; Kirby D. Johnson; Jamie L. Lahvic; Erik A. Ranheim; Leonard I. Zon; Emery H. Bresnick
Hematopoietic stem cells (HSCs) originate from hemogenic endothelium within the aorta-gonad-mesonephros (AGM) region of the mammalian embryo. The relationship between genetic circuits controlling stem cell genesis and multi-potency is not understood. A Gata2 cis element (+9.5) enhances Gata2 expression in the AGM and induces the endothelial to HSC transition. We demonstrated that GATA-2 rescued hematopoiesis in +9.5−/− AGMs. As G-protein-coupled receptors (GPCRs) are the most common targets for FDA-approved drugs, we analyzed the GPCR gene ensemble to identify GATA-2-regulated GPCRs. Of the 20 GATA-2-activated GPCR genes, four were GATA-1-activated, and only Gpr65 expression resembled Gata2. Contrasting with the paradigm in which GATA-2-activated...

7. System-Level Coupled Modeling of Piezoelectric Vibration Energy Harvesting Systems by Joint Finite Element and Circuit Analysis - Congcong Cheng; Zhongsheng Chen; Hongwu Shi; Ziniu Liu; Yeping Xiong

8. Determinación de la característica de transferencia de los componentes circuitales para un modelo de simulación de aisladores - Morcelle del Valle, Pablo; Deorsola, Marcos Félix Pedro; Catalano, Leonardo J.
El conocimiento del valor y la característica de la corriente de fuga en los aisladores en función de la contaminación y de la tensión aplicada, es en la actualidad una información interesante y útil para determinar el comportamiento de dichos componentes de las líneas de transmisión eléctrica. Por otra parte, la determinación de modelos eléctricos que satisfagan en la mayor medida posible las relaciones tensión-corriente obtenidas experimentalmente permitiría, mediante simulación numérica, el estudio del comportamiento de los aisladores ante tensiones y/o contaminaciones particulares. Usualmente estos modelos de simulación están basados circuitos capacitivo-conductivos alineales con característica de transferencia simétrica. En el...

9. PRINCIPLES OF IMPLEMENTATION OF CURRENT PROTECTION FROM INTERPHASE SHORT-CIRCUITS ON THE POWER LINES WITH UNILATERAL FEED - F. A. Romaniuk; M. A. Shevaldin

The article describes the implementation of the principle of overcurrent protection from interphase  short-circuits  on  the  power  lines  with  unilateral  feed.  The  expression  of  the detection of the fault location by the relative value of the distance from the installation of pro- tection to the point of damage with the help of the results of operational control of the short- circuit current damaged phases has been suggested in the article. Also the expression for determining  the  time  delay response  for  such  protection  has been  presented,  taking  into account fault location that had been detected.

The paper proposes and describes the...

10. Estudio de fenómenos transitorios en circuitos eléctricos de primer orden; Study of transient phenomena in first order circuits - Bertha María Soriano González; Frank Grau Merconchini; Llohandry Cruz Carnero

Este trabajo expone una metodología para estudiar procesos transitorios de corriente alterna y directa, en circuitos eléctricos lineales con un solo elemento almacenador de energía, empleando un sistema de instrumentación con una computadora y una tarjeta de adquisición de datos que permitió  generar un tren de  pulsos para sustituir los dispositivos de conexión y desconexión de la fuente. Se presentan los modelos matemáticos de los procesos transitorios, en presencia del tren de pulsos y para la combinación de este en serie con una fuente de señal sinusoidal; así como el diseño, la implementación de la práctica de laboratorio y las...

11. Sistema para cálculos en redes de distribución primaria - Leonardo Casas Fernández; Jorge Adrián Leyva Jassa

Tradicionalmente, los cálculos relacionados con las redes de distribución se apoyan en numerosas
aproximaciones debido fundamentalmente a la dificultad de obtener datos confiables y a las simplificaciones
hechas para realizarlos. En este artículo se valora la representación de cada elemento de estos circuitos
con el fin de obtener respuestas lo más exactas posible en los estudios de los circuitos de distribución
primaria. Basado en las ideas expuestas para reducir al mínimo las simplificaciones, se ha desarrollado
RADIAL, un sistema de computación que garantiza alta fiabilidad, con el cual es posible alcanzar resultados
de alta calidad vinculados con los problemas más...

12. Design of the Sequential System Automata using Temporal Equivalence Classes - A. Ursu; G. Gruita; S. Zaporojan
A design method of sequential system automata using temporal logic specifications is proposed in this paper. The method is based on well-known Z.Manna and P.Wolper temporal logic satisfiability analysis procedure [1] and is extended to include past time temporal operators. A new specification method which uses temporal equivalence classes is proposed to specify the behaviour of large digital circuits. The impact of the composition and decomposition operations of the temporal equivalence classes on the final automata has been studied. A case study is carried out which deals with the design of the synchronous bus arbiter circuit element. The SMV tool...

13. An efficient time discretization procedure for finite element-electronic circuit equation coupling - Dular, Patrick; Kuo-Peng, P.
Peer reviewed

14. Hybrid magnetic equivalent circuit - finite element modelling of transformer fed electrical machines - Gyselinck, Johan; Dular, Patrick; Legros, Willy; Grenier, Damien
Peer reviewed

15. Parvalbumin interneurons and oscillations enhance information processing in cortical microcircuits
Oscillations in fast-spiking neurons that express parvalbumin may be involved in information processing, and may be deficient in neural circuit pathologies including schizophrenia. However, it has not been possible to demonstrate a quantitative impact of this oscillatory system on information processing. Here we use dynamic clamp and optogenetic tools to deconstruct the pyramidal cell- parvalbumin interneuron microcircuit, and information theory to measure how oscillations affect the function of each circuit element.

First, we studied how oscillations affect single neocortical pyramidal neurons. Using dynamic clamp, we stimulated neocortical pyramidal neurons with trains of simulated excitatory post-synaptic currents (sEPSCs)....

16. An EM Transistor/Memristor (EMTM) Based Brain-Processor Interface - Rostyslav Sklyar
To date, a wide range of neural electrodes have been used in basic neuroscience and neural prosthetic research (brain machine interfaces). Polymeric microprobes have received a great deal of attention owing to their simple fabrication process, flexibility and biocompatibility. Implantable neural probes for neuroscience and brain machine interfaces are generally preferred to have a minimum footprint as possible to minimize neural damage. Alternatively, a superconducting field effect transistor (SuFET) based neurotransducer with carbon nanotubes (CNT) or pickup coil (PC) kind of input circuit for the nerve and neuron impulse has been designed. A nanoSuFET with a high-temperature superconducting channel is...

17. GEOMAGNETIC CONJUGACY OF MODERN TECTONIC STRUCTURES - G. Ya. Khachikyan; N. S. Zhakupov; N. Zh. Kadyrkhanova
An earthquake is an element of the global electric circuit (GEC) –  this new idea suggested in the space age is tested in our study. In the frame of the GEC concept, one may expect that tectonic structures of the northern and southern hemispheres may be magnetically conjugated. It is found that the midocean ridges of the southern hemisphere, located along the boundary of the Antarctic lithosphere plate, are magnetically conjugated with the areas of the junction of continental orogens and platforms in the northern hemisphere. The closest geomagnetic conjugacy exists between the southern boundary of Nazca lithospheric plate and...

18. A compact design for the Josephson mixer: The lumped element circuit - Pillet, J.-D.; Flurin, E.; Mallet, F.; Huard, B.
International audience

19. A compact design for the Josephson mixer: The lumped element circuit - Pillet, J.-D.; Flurin, E.; Mallet, F.; Huard, B.
International audience

20. Factors Influencing The Sensitivity Of The CDMPI Sensor - Pratap Kollu; Seok Soo Yoon; Chong Oh Kim; Cheol Gi Kim
Abstract: A highly sensitive magnetic sensor using the GMI (Giant Magneto Impedance) effect has been developed. The sensor performance is studied and estimated. The sensor circuitry consists of a Square wave generator (driving source), a sensing element in a form of composite wire of a 20 m copper core electrodeposited with a thin layer of soft magnetic material (Ni80Fe20), two amplifier stages for improving the gain from the sensor element., switching mechanism, scaler circuit, an ac power source driving the permeability of the magnetic coating layer of the sensing element into a dynamic state, and a signal pickup LC circuit...

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