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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 554

1. 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...

2. 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...

3. 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...

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

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

6. 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)....

7. 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...

8. 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...

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

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

11. 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...

12. FEATURES APPLICATION CIRCUIT MOMENT FINITE ELEMENT (MSSE) NONLINEAR CALCULATIONS OF PLATES AND SHELLS - Bazhenov V.A.; Sacharov A.S.; Guliar A. I.; Pyskunov S.O.; Maksymiuk Y.V.
Based MSSE created shell CE general type, which allows you to analyze the stress-strain state of axisymmetrical shells and plates in problems of physical and geometric nonlinearity. The principal nonlinear elasticity theory, algorithms for solving systems of nonlinear equations for determining the temperature and plastic deformation.

13. Broadband Macromodels for Retarded Partial Element Equivalent Circuit (rPEEC) Method - Giulio Antonini; Dirk Deschrijver; Tom Dhaene; Senior Member
Abstract—The partial element equivalent circuit (PEEC) method is, nowadays, widely used in electromagnetic compatibility and signal integrity problems in both the time and frequency domains. Similar to other integral-equation-based techniques, its time domain implementation may suffer from late time instabilities, especially when considering delays [(Lp,P,R,τ)PEEC] (rPEEC). The cause of the instabilities may be either the numerical technique used for the time integration or problems created by the discrete representation of the electromagnetic continuous problem. In this paper, we concentrate on the latter and show that frequency dispersion plays an important role and must be taken into account in order to...

14. Dinámica y Optimización de los Sistemas de Puesta a Tierra - Jiménez Lozano, Guillermo
Con la presente Tesis de Doctorado se desarrolló una metodología para el análisis de sistemas de puesta a tierra (SPT) utilizando técnicas de Optimización. El objetivo anterior se trabajó teniendo en cuenta un método de evaluación de SPT, el empleo de métodos de Optimización y su aplicación a la norma de la IEEE–80 (2013) y la realización de un experimento comparativo del método elaborado. Todo este trabajo fue posible con la elaboración de diferentes configuraciones de red caracterizadas por distintas distancias entre conductores, a través de diversas geometrías y también por varias profundidades de excavación. Además, considerando la corriente de falla...

15. Manutenção de instrumentos laboratoriais na pesquisa agropecuária. - BISCEGLI, C. I.; RABELLO, L. M.; CRUVINEL, P. E.; HERRMANN JUNIOR, P. S. P.; FERREIRA, W. S.
Elementos de circuitos passivos: dispositivos basicos. Fontes de alimentacao. Principais equipamentos eletronicos para a manutencao de instrumentos laboratoriais da pesquisa agropecuaria. Elementos de circuitos ativos: dispositivos semicondutores. Amplificadores operacionais, microprocessadores e arquitetura de computadores em instrumentacao. Instrumentos opticos. Como realizar a manutencao em microscopios, balancas analogicas, estufas, B.O.D, pH-metros, colorimetros, balancas eletronicas, fotometros de chama e porometros. Termos tecnicos em instrumentacao.

16. Design and Construction of a Brain-Like Computer: A New Class of Frequency-Fractal Computing Using Wireless Communication in a Supramolecular Organic, Inorganic System - Subrata Ghosh; Krishna Aswani; Surabhi Singh; Satyajit Sahu; Daisuke Fujita; Anirban Bandyopadhyay
Here, we introduce a new class of computer which does not use any circuit or logic gate. In fact, no program needs to be written: it learns by itself and writes its own program to solve a problem. Gödel’s incompleteness argument is explored here to devise an engine where an astronomically large number of “if-then” arguments are allowed to grow by self-assembly, based on the basic set of arguments written in the system, thus, we explore the beyond Turing path of computing but following a fundamentally different route adopted in the last half-a-century old non-Turing adventures. Our hardware is a...

17. The Bandwidths of a Matrix. A Survey of Algorithms - Mafteiu-Scai Liviu Octavian
The bandwidth, average bandwidth, envelope, profile and antibandwidth of the matrices have been the subjects of study for at least 45 years. These problems have generated considerable interest over the years because of them practical relevance in areas like: solving the system of equations, finite element methods, circuit design, hypertext layout, chemical kinetics, numerical geophysics etc. In this paper a brief description of these problems are made in terms of their definitions, followed by a comparative study of them, using both approaches: matrix geometry and graph theory. Time evolution of the corresponding algorithms as well as a short description of...

18. A Linear CMOS Transconductance Element - Bhaskar Gopalan
A novel circuit technique for realizing a linear CMOS transconductance element is proposed. The present circuit is an alternative to that of conventional source-coupled differential pair (SCDP) and the circuit discussed has superior linearity than the SCDP for a wide range of input differential voltage. The SPICE results using BSIM3v3.1 model are used to verify theoretical predictions. The results show close agreement between predicted behavior and simulated performance. The simulated results on Total Harmonic Distortion (THD) show that the proposed circuit is better than the SCDP for a wide range of input differential voltage. An example circuit, a second order...

19. Electronically Tunable Multi-Terminal Floating Nullor and Its Applications - W. Tangsrirat
A realization scheme of an electronically tun- able multi-terminal floating nullor (ET-MTFN) is de- scribed in this paper. The proposed circuit mainly employs a transconductance amplifier, an improved translinear cell, two complementary current mirrors with variable current gain and improved Wilson current mirrors, which provide an electronic tuning of the current gain. The va- lidity of the performance of the scheme is verified through PSPICE simulation results. Example applications employing the proposed ET-MTFN as an active element demonstrate that the circuit properties can be varied by electronic means.

20. Automatização de um destilador d'água - Neves Carlos A.; Gutz Ivano G. R.; Lago Claudimir L. do
A simple and inexpensive device to automate a water distilling apparatus is shown. It is composed by a magnetic floater placed in the water reservoir and a level control unit, which acts over the heating element circuit. In order to provide water saving, an electromagnetic valve is inserted in the water supply inlet. Some suggestions for the adaptation to other types of equipment are also offered.

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