Electronic Circuits
Mostrando 1-12 de 84 artigos, teses e dissertações.
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1. Sistema computadorizado para deslocamento de amostra com motor de passo utilizando o L298: aplicação na técnica de varredura-Z
Resumo Neste trabalho vamos abordar uma nova tecnologia, de baixo custo, de controle de motor de passo via computador, a qual pode ser utilizada para movimentação de amostras. Mais especificamente, desenvolvemos um sistema de controle usando o módulo eletrônico comercial L298, que evita o uso de um circuito eletrônico tradicional complexo de múltiplos
Rev. Bras. Ensino Fís.. Publicado em: 18/04/2019
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2. Analysis of Ball Soldering Parameters on the Properties of a BGA Packaged Semiconductor
Integrated circuits have several applications, including medicine and the aerospace industry, where reliability is essential. Packaging is an important step in the manufacturing of integrated circuits, and ball soldering is one of the most critical process, especially in assembling and interconnecting integrated circuits. The solder joint formed during the b
Mat. Res.. Publicado em: 01/02/2018
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3. Low cost system to measure active power in electrosurgical units
Abstract Introduction: The real-time measurement of active power delivered to patients during the electrosurgical act is still an engineering challenge. Besides, there is no electrosurgical unit on the market capable of doing it according to the normative requirement. Methods This work presents the design of an electronic structure capable to probe the ele
Res. Biomed. Eng.. Publicado em: 09/11/2017
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4. Opto-electronic Properties of Nano-electronic Materials
Nanoelectronic is nanotechnology applied in the context of electronic circuits and systems. Molecular electronic, which is supposed to replace silicon electronic in the future, is an incipient branch of Nanotechnology which focusing on the organic molecules. Since recognizing and examining this family of Nanostructures needs a long time and very expensive, a
Mat. Res.. Publicado em: 13/07/2017
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5. Power amplifier circuits for functional electrical stimulation systems
Abstract Introduction: Functional electrical stimulation (FES) is a technique that has been successfully employed in rehabilitation treatment to mitigate problems after spinal cord injury (SCI). One of the most relevant modules in a typical FES system is the power or output amplifier stage, which is responsible for the application of voltage or current puls
Res. Biomed. Eng.. Publicado em: 2017-06
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6. Bioleaching of gold, copper and nickel from waste cellular phone PCBs and computer goldfinger motherboards by two
Aspergillus niger strainsIn an effort to develop alternate techniques to recover metals from waste electrical and electronic equipment (WEEE), this research evaluated the bioleaching efficiency of gold (Au), copper (Cu) and nickel (Ni) by two strains of
Aspergillus niger in the presence of gold-plated finger integrated circuits found in computer motherboards (GFIBraz. J. Microbiol.. Publicado em: 2015-09
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7. Galvanic vestibular stimulator for fMRI studies
INTRODUCTION: Areas of the brain that are associated with the vestibular system can be activated using galvanic vestibular stimulation. These areas can be studied through a combination of galvanic vestibular stimulation with functional magnetic resonance imaging (fMRI). In order to provide an appropriate sequence of galvanic stimulation synchronous with the
Rev. Bras. Eng. Bioméd.. Publicado em: 2014-03
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8. ObtenÃÃo das cerÃmicas dielÃtricas BiTRWO6 (TR = Y, Gd ou Nd) por radiaÃÃo de micro-ondas e sua aplicaÃÃo em dispositivos eletrÃnicos / Obtaining Of Ceramic Dielectric BiTRWO6 (Tr = Y, Gd Or Nd) By Microwave Radiation And Its Application In Electronic Devices
The mixture heat of the metal oxides may promote the formation of ceramic materials, depending on their dielectric properties and its crystalline structure may be used with electronic components for a variety of functions in electrical circuits. Heating method is directly related to the material properties. This work aims to use a commercial microwave oven m
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/08/2012
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9. Espectroscopia ultrarrápida do polímero semicondutor luminescente MEH-PPV com excitação no ultravioleta / Ultrafast spectroscopy of the luminescent semiconducting polymer MEH-PPV with ultraviolet excitation
The optoelectronics industry is currently undergoing a transition period in which inorganic materials are being replaced by organic materials, oligomers and polymers, in the fabrication of some types of devices. However, factors such as low efficiency and low lifetime prevent polymer based devices on entering the market definitely. The solution of these issu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/08/2012
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10. Sistema eletrônico de controle para laser amarelo de aplicação oftalmológica com regime de operação contínuo e micro-pulsado / Electronic control system to yellow laser for ophthalmic applications and continuous or micro second pulse regime
Recently, scientists have proposed a new technique for treating diseases related to the human retina, which is based on retinal laser discharges using pulse sequence around of 200 \ mü\ s, replacing the conventional treatment using long pulses around of 300 ms. The main advantage of the new technique is the conservation (without cell death) of the area expo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/03/2012
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11. A robustez de um sistema de distribuição e a alocação de medidores de qualidade da energia elétrica frente aos afundamentos de tensão / The robustness of a distribution system and an allocation of power quality monitors in the face of the voltage sags
This dissertation aims to initially reintroduce and spread the Fault Positions Method (FPM) as an analytic means to determine the remaining voltage in all bus bar constituents of a Distribution System (DS), upon the occurrence of voltage sags. By applying this method, it is possible to formulate the during fault voltage matrix, thus denoting the influence an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2012
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12. ANALISE E PROJETO DO CONVERSOR BUCK INTERCALADO PARA ALIMENTAÇÃO DE LÂMPADAS DE DESCARGA EM ALTA PRESSÃO DE ALTA POTÊNCIA / INTERLEAVED BUCK CONVERTER ANALYSIS FOR HIGH POWER HIGH INTENSITY DISCHARGE LAMPS SUPPLYING
This work presents a detailed analysis about the interleaved buck converter applied to electronic ballasts to supply high power HID lamps, assuming the input voltage as a PFC stage output. As the output capacitor has a maximum value to be applied in parallel with the lamp, parallel operated converters are a suitable choice because the output current ripple c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012