Ohmic Resistance
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. AC Induced Corrosion of Underground Steel Pipelines. Faradaic Rectification under Cathodic Protection: II. Theoretical Approach with Electrolyte Resistance and Double Layer Capacitance for Bi-Tafelian Corrosion Mechanism
AC corrosion enhancement of buried steel pipe is induced by high stray AC electromagnetic field and to the faradaic rectification due to non-linearity of current-potential characteristics. In Part I, this phenomenon was evaluated by neglecting the electrical resistance of soil electrolyte. In this part, we will examine when this resistance is no longer negli
J. Braz. Chem. Soc.. Publicado em: 2016-03
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2. Characterization of copper microelectrodes, following a homemade lithography, technique, and gold electroless deposition
We report the fabrication and characterization of copper microelectrodes obtained by a homemade lithography technique and after gold electroless deposition. For the fabrication, planes consisting of arrays of electrodes (black in color) with bow tie shape were designed and printed on a transparent paper (Canson ltd.). Using an embroidery frame with a silk fa
Matéria (Rio J.). Publicado em: 2016-03
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3. Avaliação da corrosividade do etanol combustível utilizando arranjo de microeletrodos / Corrosion evaluation in ethanol fuel using microelectrodes array
This work presents an investigation on the corrosion of cooper metal, using a microelectrode array building using lithography technique. The influence of microelectrode array area was investigated on the ohmic drop and resistance of ethanol. The results were then compared with existing theoretical methodologies and good agreements were found. It was conclude
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/03/2012
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4. Desenvolvimento e aplicação de eletrodos compósitos à base de grafite e Araldite® / Development and apllication of composite electrode graphite-Araldite®
The development and evaluation of the voltammetric behavior of composite electrodes prepared with graphite as a conducting phase and commercial epoxy resin Araldite ® as an insulating phase was performed. The resin was prepared according to instructions of the manufacturer and mixed with a suitable amount of graphite in order to prepare composites with 50,
Publicado em: 2008
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5. Análise por impedância eletroquímica \"on-line\" de conjuntos eletrodo/membrana (MEA) de células a combustível a membrana polimérica (PEMFC) / Analysis for impedance electrochemistry \"on-line\" of membrane/electrode assemble (MEA) of protons exchange membrane fuel cells (PEMFC)
This work reports results of studies and characterization on Membrane Electrode Assemblies (MEAs) for Proton Exchange Membrane Fuel Cell (PEMFC). Some cell operation conditions and different processes of MEA production were investigated. The Electrochemical Impedance Spectroscopy Technique (EIS) (in situ - 0 to 16 A) was used \"on-line\" as a tool for diagno
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/08/2007
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6. Caracterização elétrica de contatos rasos de siliceto de níquel sobre junções N+P. / Electrical characterization of nickel-silicide shallow contacts on N+P junctions.
This work presents the fabrication and electrical characterization of Al/Ti/Ni(Pt)Si contacts having the nickel monosilicide formed from Ni(30nm)/Pt(1.5nm)/Si structure on shallow N+P junctions with about 0.2 ìm of depth. The diodes? electrical behavior achieved at the best process was considered good, with the following average and standard deviations: are
Publicado em: 2006
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7. Decoherence of electron waves due to induced charges moving through a nearby resistive material
An experiment in which decoherence, i.e. the transition from quantum to classical behaviour, can be studied in detail was proposed by Anglin and Zurek [1] and has now been realized. An electron beam in a biprism interferometer is split into two parts both of which travel over a plate made of a highly resistive material at the same, small height. The induced
Brazilian Journal of Physics. Publicado em: 2005-06
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8. METODOLOGIA PARA AVALIAÇÃO METROLÓGICA DE CARACTERÍSTICAS DE UM TERMISTOR PTC POLIMÉRICO REGENERATIVO / METHODOLOGY FOR METROLOGICAL EVALUATION OF THE CHARACTERISTICS OF A PTC POLYMERIC RESETTABLE THERMISTOR
This research aims at the development of a methodology for experimentally characterizing a PTC polymeric resettable thermistor LP60-110, used as an overcurrent and over temperature protection device. Uncertainty of measurement of the parameters, such as temperature, voltage, current and ohmic resistance is also determined. The PTC (Positive Temperature Coeff
Publicado em: 2005
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9. AVALIAÇÃO METROLÓGICA DE VARISTORES DE ÓXIDO DE ZINCO PARA MÉDIA TENSÃO / METROLOGICAL EVALUATION OF ZINC OXIDE VARISTORS OF MEDIUM VOLTAGE
Despite its many benefits, one of the few disadvantages of semiconductor technology is the vulnerability of solid state devices to undesired increase in temperature, voltage and current . Even low voltage pulses can produce interference and damages with several consequences. Thus, as electronics are used in more and more applications, temperature, protection
Publicado em: 2004
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10. Desenvolvimento e aplicação de eletrodos compósitos à base de borracha de silicone e grafite.
Composite electrodes were prepared using graphite powder and silicone rubber in different compositions. The use of such hydrophobic materials interned to diminish the swallowing observed in other cases when the electrodes are used in aqueous solutions for a long time. The composites were characterized for the response reproducibility, ohmic resistance, therm
Publicado em: 2004
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11. Electric current flow in a two-cell preparation from Chironomus salivary glands.
Conventional micro-electrode techniques were used to study the passive electrical properties of salivary glands from Chironomus nuditarsis insect larvae of the fourth instar stage. Linear cable analysis performed on intact glands revealed the following constants: axial intracellular resistance, Ri = 2730 omega cm; membrane resistance per unit apparent cylind
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12. Effects of changes in excitability and intercellular coupling on synchronization in the rabbit sino-atrial node.
The mechanisms of synchronization between sino-atrial pace-maker cells were studied in biological preparations from rabbit hearts, and in computer simulations of the Hodgkin & Huxley type. For biological experiments, thin strips of sino-atrial node were placed in a three-compartment bath. The electrical properties of the tissue in the middle segment (the 'ga