Short Circuit
Mostrando 1-12 de 377 artigos, teses e dissertações.
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1. Short Circuit and Recovery Time Tests in a helical bifilar R-SFCL module
Abstract Superconducting Fault Current Limiter (SFCL) modules with distinct arrangements have been investigated, seeking design and performance enhancements. In this context, this work aims to propose a design for resistive SFCL (R-SFCL) modules, using RE-Ba-Cu-O high-temperature superconducting tapes (HTS) wound on an alternative support material. An R-SFCL
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. Effect of Push-Pull Ruthenium Complex Adsorption Conformation on the Performance of Dye Sensitized Solar Cells
A new series of tris-(bipyridyl)ruthenium-like complexes based on the 4-tripheylamine-2,2’:6’,2’’-terpyridine (TPA) push-pull ligand was prepared by incorporation of 4-carboxypyridine (cpy), 4,4’-dicarboxi-2,2’-bipyridine (dcbpy) and 4-carboxyterpyridine ligands (ctpy) ligands, in order to adsorb them on TiO2 in different anchoring conformations.
J. Braz. Chem. Soc.. Publicado em: 2020-11
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3. Flexible, Large-Area Organic Solar Cells With Improved Performance Through Incorporation of CoFe2O4 Nanoparticles in the Active Layer
Cobalt ferrite (CoFe2O4) nanoparticles (NPs), with an average diameter of about 4-10 nm, were produced by the proteic sol-gel method and successfully doped into the active layer of poly(3-hexylthiophene-2,5-diyl) (P3HT):[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) organic solar cells. Pristine and CoFe2O4 NPs-doped blends of P3HT:PCBM were dispersed in
Mat. Res.. Publicado em: 13/01/2020
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4. Efeitos da Espessura da Fita Metálica no Metal de Solda Utilizando Cavacos de Titânio Como Componentes do Fluxo em Arames Tubulares para a Formação de TiC
Resumo Cavacos de titânio foram utilizados como componentes do fluxo em arames tubulares fabricados a partir da conformação e trefilação de fitas metálicas com espessuras diferentes. Os arames apresentaram diâmetros internos com dimensões diferentes afetando as taxas de preenchimento do fluxo. Para as mesmas condições de soldagem, os arames fabric
Soldag. insp.. Publicado em: 02/12/2019
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5. Análise do desempenho de adensamento da massa refratária de sílica usada em fornos de indução
Resumo As indústrias de fundição de ferro fundido usam em seu processo grande quantidade de sucata zincada, o que tem contribuído para a redução da campanha do revestimento refratário de fornos de indução a cadinho já que o vapor de zinco formado no aquecimento migra para o centro do refratário, condensando em regiões externas do forno, próximo
Cerâmica. Publicado em: 14/11/2019
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6. Photoelectrodes with titanate nanotubes sensitized by mesoporphyrin derivative from cashew nut shell
ABSTRACT Titanate nanotubes (TiNTs) with the chemical composition Na2Ti3O7.nH2O (NaTiNT) were obtained through a hydrothermal method in highly alkaline medium. Protonated titanates nanotubes (H-TiNTs), with the composition H2Ti3O7.nH2O, were prepared by ion exchange reaction through a suspension of Na2Ti3OγnH2O nanotubes in HCl medium, promoting the exchang
Matéria (Rio J.). Publicado em: 20/05/2019
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7. Uma Metodologia para Análise da Distribuição de Contagem dos Picos de Tensão de Reignição para Avaliação da Estabilidade do Processo GMAW Curto-Circuito
Resumo A estabilidade do arco tem sido estudada através de análises estatísticas obtidas dos sinais de tensão de arco e corrente de soldagem. Histogramas e cálculo de estatísticas dos parâmetros tempo de arco aberto e tempo de curto circuito são meios de avaliação da estabilidade dos processos de soldagem. Contudo, estudos relacionados aos picos de
Soldag. insp.. Publicado em: 09/05/2019
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8. Performance Evaluation of Titanate Nanotubes and Nanoribbons Deposited by Electrophoresis in Photoelectrodes of Dye-Sensitized Solar Cells
Nanoparticles of TiO2 have been the main semiconductor applied in Dye-sensitized solar cells (DSSCs). In this work, titanate nanotubes (NaTiNT) and nanoribbons, were obtained by the hydrothermal method from TiO2 anatase. These materials were deposited on conductive substrate by electrophoresis, with and without thermal treatment, sensitized by ruthenium-base
Mat. Res.. Publicado em: 28/05/2018
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9. Theoretical study of c-GaN/GaAs single heterojunction solar cells
ABSTRACT In this work a theoretical study of electrical behavior for a c-GaN/GaAs heterostructure as a photovoltaic device through a two-dimensional (2D) finite element numerical simulation is presented for a first time. I-V curves and electrical parameters like short circuit current (Isc), open circuit voltage (Voc), fill factor (FF) and efficiency (η) wer
Matéria (Rio J.). Publicado em: 02/10/2017
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10. Construction and measurement of an electromagnetic noise generator based on an automotive coil
This article covers the design of an electromagnetic noise generator which uses an automotive coil as the main component. A short theoretical analysis covers the generation of high voltage pulsed current from the available DC source originated from the battery. An electronic dimmer, a circuit used to control the brightness of a light, by controlling the effe
Rev. Bras. Ensino Fís.. Publicado em: 22/06/2017
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11. Experimental Investigation of Ionization Sensors under Shock Tube Stagnation Conditions
ABSTRACT: Recently, there has been a growing interest in studies concerning ionization sensors for aerospace applications, power generation, and fundamental research. In aerospace research, they have been used for studies of shock and detonation waves. Two key features of these sensors are their short response time, of the order of microseconds, and the fact
J. Aerosp. Technol. Manag.. Publicado em: 2017-06
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12. Celdas solares sensibilizadas con colorantes fotosensibles obtenidos de plantas de la región sur de ecuador
Four vegetal species of the southern of Ecuador were used as sensitizers for making dye-sensitized solar cells (DSSCs). The effect of type and amount of material, type and time of maceration were tested in order to determine the best conditions of extraction. The extraction of the natural dye was made with acidified ethanol. The sensitizing agents were adsor
Quím. Nova. Publicado em: 2017-04