Transmission Line Method
Mostrando 13-24 de 80 artigos, teses e dissertações.
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13. The Influence of a Translucent Fiberglass Post on the Polymerization of Dual Cure Resin Cement Analyzed by Electron Paramagnetic Resonance
AbstractElectron Paramagnetic Resonance (EPR) was used as an alternative method to study the conversion degree of dual cure resin cement and verify the influence of prefabricated translucent fiberglass post on the dual cure resin cement polymerization at different restoration points. The post cementation of White Post DC (FGM, Joinville, SC, Brasil) was simu
Mat. Res.. Publicado em: 2015-10
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14. Soil corrosion of the AISI1020 steel buried near electrical power transmission line towers
Soil corrosion of carbon steel samples buried up to hundred days close to a high voltage power transmission line tower was examined by weight loss vs. time. A higher weight loss was observed if the samples were electrically connected to the tower than if they were not. This was attributed to the influence of alternating current (AC) signals induced in the so
Mat. Res.. Publicado em: 2014-12
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15. Synthesis, characterization and microwave absorption of carbon-coated Cu nanocapsules
The microstructure and microwave absorption of carbon-coated Cu nanocapsules have been investigated. Carbon-coated Cu nanocapsules have been synthesized by an arc-discharge method. The paraffin-Cu/C nanocapsules composite shows excellent electromagnetic (EM) absorption properties. An optimal reflection loss (RL) value of - 40.0 dB is reached at 10.52 GHz for
Mat. Res.. Publicado em: 24/01/2014
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16. Dynamic analysis of superconductor at high temperature for antennas array
The analysis and new results of the resonance frequency and radiation pattern of antennas array, for glass fiber FR-4 substrate using superconductor and copper patch, are presented. The linear superconducting rectangular antennas array uses the new materials SnBaCaCuOy at temperature of 160 K with conductivity equal 1.5 x 10(5) S/m. The concise full wave Tra
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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17. Evaluation of natural foci of Panstrongylus megistus in a forest fragment in Porto Alegre, State of Rio Grande do Sul, Brazil
Introduction Panstrongylus megistus is commonly found in wild environments of the State of Rio Grande do Sul, Brazil. The aim of this study was to characterize the network of refuges used by triatomine in a forest fragment of Porto Alegre and to identify Trypanosoma cruzi infection, associated hosts and the epidemiological importance of both hosts and tria
Rev. Soc. Bras. Med. Trop.. Publicado em: 2013-09
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18. An improved zeroth order resonator using left handed metamaterial
In this paper an improved version of zeroth order resonator (ZOR) using Left Handed Metamaterial (LHM) is reported, and its performance is compared with the earlier published ZOR. The resonator is designed based on microstrip technology using composite right left handed transmission line (CRLH TL) approach. The conventional ZOR is designed based on the CRLH
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-06
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19. Effect of rare earth ions on transition temperature in perovskite materials by on-line ultrasonic studies
On-line measurements of ultrasonic longitudinal velocity, shear velocity and longitudinal attenuation were carried out on R1-xSr xMnO3 perovskites (R = La, Pr, Nd and Sm) for different compositions of Sr, at a fundamental frequency of 5 MHz over wide range of temperatures using the through-transmission method. The observed maxima/minima in velocities and att
Materials Research. Publicado em: 26/06/2012
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20. Modeling of electromagnetic waves propagation in four-level two-electron atomic systems governed by Pauli Exclusion Principle using the TLM method
This paper presents a computational model of electrons dynamics and gain in four-level two-electron atomic systems. These systems, submitted to an electromagnetic wave, are governed by Pauli Exclusion Principle and they are modeled using the Time-Domain Transmission Line Matrix (TLM) method with the symmetrical condensed node (SCN) with novel voltage sources
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2012-06
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21. Caracterização de antenas planares com substrato metamaterial
Esta dissertação de Mestrado apresenta uma análise teórica e numéricocomputacional, das características ressonantes de uma antena de microfita com patch retangular utilizando substrato metamaterial. A análise utiliza o formalismo de onda completa através da aplicação do método da Linha de Transmissão Transversa - LTT, no domínio da transformada
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/11/2011
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22. A load effect evaluation of a transmission line exciting chamber
This paper presents an evaluation of the phase shifting excitation and load effects in a Transmission Line Exciting Chamber. This chamber is suggested as an alternative for immunity tests because of the restrictions related to canonical chambers. Here, two methods are used to calculate the E-field: a semi-analytic approach and a numerical one. The semi-analy
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-06
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23. Preparation of nanodimensional CdS by chemical dipping technique and their characterization
A simple and cost effective chemical technique has been utilized to grow cadmium sulphide (CdS) nanoparticles at room temperature. The sample is characterized with XRD (X-ray diffractometer), SEM (Scanning electron microscope), TEM (Transmission electron microscope) and UV-VIS spectrophotometer. The particle size estimated using X-ray line broadening method
Materials Research. Publicado em: 01/04/2011
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24. Stochastic texture image estimators for local spatial anisotropy and its variability
A new image analysis technique is proposed for the evaluation of local anisotropy and its variability in stochastic texture images. It utilizes the gradient function to provide information on local anisotropy, from two-dimensional (2-D) density images for foil materials like polymer sheets, nonwoven textiles, and paper. Such images can be captured by radiogr
Publicado em: 2011