Printed Circuit
Mostrando 13-24 de 39 artigos, teses e dissertações.
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13. Thermal inkjet printing of copper tetrasulfonated phthalocyanine (CuTsPc) as a semiconducting layer on flexible MIS capacitors
Thermal inkjet-printing of copper tetrasulfonated phthalocyanine (CuTsPc) films containing polyvinyl alcohol (PVA) plasticizer were used to fabricate flexible metal-insulator-semiconductor (MIS) capacitors using anodic aluminum oxide (Al2O3) as the insulating layer. The Al2O3 layer and printed CuTsPc+PVA films were characterized individually and in a MIS str
Mat. Res.. Publicado em: 2014-12
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14. Geometry optimization for application of radio frequency signals on diamond samples
This work describes the design and optimization of a printed circuit board containing a rectangular half-loop coil designed to apply radio frequency signals on micrometric diamond crystals. The structure was optimized to maximize the magnetic field perpendicular to the coil at 2,87 GHz. In the optimization process we have used transmission line theory, circu
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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15. Microstrip feed spanner shape monopole antennas for ultra wide band applications
An optimized design for the spanner shape regular hexagonal monopole (RHM) patch antennas has been reported to yield ultra wide band (UWB) impedance bandwidth. Impedance and radiation characteristics are presented and discussed. From the results, it has been observed that, the impedance bandwidth, defined by 10 dB return loss, can reach a value of 8.63GHz. A
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
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16. Processamento de placas de circuito impresso de equipamentos eletroeletrônicos de pequeno porte
A hydrometallurgical process applicable to printed circuit boards of small electrical and electronic devices was developed. This involved three leaching steps (60 ºC, 2 h): 6 mol L-1 NaOH, 6 mol L-1 HCl and aqua regia. NaOH removed the resin and flame retardant that covered the circuit boards. HCl dissolved the most electropositive metals and a small amount
Quím. Nova. Publicado em: 2013
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17. Incorporação de resíduos de placas de circuitos impressos (RPCI) em massas cerâmicas triaxiais utilizando experimentos com misturas / Incorporation of waste printed circuit boards (WPCB) in triaxial ceramic bodies using experiments with mixtures
The aim of this work is evaluate the effect of incorporation of waste printed circuit boards (WPCB) in physical and mechanical properties of triaxial ceramics for coating. Through the technique of experiment with mixtures seven formulations were developed with clay (40, 53, 60 e 80%); phyllite (20, 33, 40 e 60%) and waste (0, 14, 20 e 40%). The WPCB was char
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/02/2012
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18. Planar multilayer structure analysis: an educational approach
This paper discusses how symbolic computation combined with a circuit model can be used for analyzing planar multilayer structures, in a manner suitable for educational approach. Working in the Fourier domain, expressions for the transversal spectral Green’s functions are evaluated in compact, closed form using the symbolic computation capability of the Ma
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
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19. Reciclagem do lixo de informática: uma oportunidade para a química
Recycling and sustainable development are increasing in importance around the world. In Brazil, the new National Policy on Solid Wastes has prompted discussion on the future of electronic waste (e-waste). Brazil generates the greatest amount of e-waste among Latin American countries. Nevertheless complete recycling, including end processing of e-waste, does
Química Nova. Publicado em: 2012
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20. Conjugate Cooling of a Discrete Heater in Laminar Channel Flow
Electronic components are usually assembled on printed circuit boards cooled by forced airflow. When the spacing between the boards is small, there is no room to employ a heat sink on critical components. Under these conditions, the components’ thermal control may depend on the conductive path from the heater to the board in addition to the direct convecti
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-09
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21. Recuperação de metais a partir do processamento mecânico e hidrometalúrgico de placas de circuito impresso de celulares obsoletos. / Metals recovery from mechanical and hydrometalurgy processing of printed circuit boards from obsolete mobile.
O avanço da tecnologia de aparelhos eletro-eletrônicos favorece a troca constante dos equipamentos. O freqüente descarte de aparelhos obsoletos se torna um problema de sustentabilidade e também um problema ambiental devido ao seu acúmulo em aterros. A solução para minimizar estes impactos é a reciclagem de seus componentes. Por esta razão, o princip
Publicado em: 2010
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22. Utilização de processos mecânicos e eletroquímicos para reciclagem de cobre de sucatas eletrônicas = Use of mechanical and electrochemical process for recycling of copper from electronic scraps / Use of mechanical and electrochemical process for recycling of copper from electronic scraps
O crescimento constante na geração de resíduos sólidos em todo o mundo tem estimulado estudos para os mais variados tipos de resíduos. Nesse trabalho, foram estudadas as Placas de Circuito Impresso (PCI), que fazem parte das sucatas eletrônicas e que são encontradas nos equipamentos eletroeletrônicos. As PCI são compostas de polímeros, cerâmicos e
Publicado em: 2010
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23. Microssensores magnéticos tipo fluxgate planar utilizando ligas de NiFe eletrodepositadas / Planar microfluxgates using NiFe eletrodeposited cores.
This work present the development of fluxgate magnetic field sensors based on planar technology. The material for the core of the device is based on early works that determined the best NiFe electrodeposition parameters for this application. Functional devices were created proving the usability of the alloy. Also 4 new layouts were proposed in order to build
Publicado em: 2010
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24. Recovery of tin and copper by recycling of printed circuit boards from obsolete computers
This paper presents the experimental results for the leaching of printed circuit boards (PCB) from obsolete computers for extracting and recovering tin and copper by means of leaching followed by precipitation. Printed circuit boards were dismantled, cut into small pieces, and fed into a cylinder mill. The powder obtained was leached by using the aqueous sol
Brazilian Journal of Chemical Engineering. Publicado em: 2009-12