Thermal Pulse
Mostrando 1-12 de 51 artigos, teses e dissertações.
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1. Efficacy of removal of cariogenic bacteria and carious dentin by ablation using different modes of Er:YAG lasers
The primary objective of this in vitro study was to evaluate the efficiency of removal of cariogenic bacteria and carious dentin by ablation using two lasers: fluorescence-feedback controlled (FFC) Er:YAG laser and different pulses of Er:YAG laser based on variable square pulse technology (VSPt). The secondary objective was to measure the temperature during
Braz J Med Biol Res. Publicado em: 11/01/2018
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2. Comparative Study of Magnetic Properties and Microstructure for As-cast and Square-wave Pulse Current Joule Annealed Wires
We here report on a comparative study of the microstructure and magnetic properties of as-cast and SPCJA-ed Co-based wires for potential sensor applications. Experimental results indicate that both as-cast and SPCJA-ed wires exhibit typical amorphous feature. There also exists the enhanced local ordering degree of atomic arrangement and obvious transformatio
Mat. Res.. Publicado em: 23/10/2015
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3. Energy evaluation of an evaporative cooling system using water driven ejector
The search for efficient and accessible cooling systems has increased worldwide. This study aims to build and evaluate an evaporative cooling system using a water driven ejector, allowing it to be installed in places with plenty of water. The system was investigated varying the flow rate and temperature of the circulating water, temperature of the replacemen
Food Sci. Technol. Publicado em: 20/06/2014
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4. A comparative leakage study on Er,Cr: YSGG laser- and bur- prepared Class V cavities restored with a low-shrinkage composite using different filling techniques
AIM: To evaluate the leakage on Er,Cr:YSGG laser- and bur- prepared Class V cavities restored with a silorane-based composite resin using different insertion techniques METHODS: 40 cavities were outlined according to: the type of instrument [Er,Cr:YSGG laser (3.0 W power, energy per pulse of 150 mJ, fluence of 53.57J/cm², pulse duration of 140-200 ∝s, 20
Braz. J. Oral Sci.. Publicado em: 2013-06
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5. 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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6. An Analysis of the Initiation Process of Electro-explosive Devices
Abstract: Electro-explosive devices (an electric resistance encapsulated by a primary explosive) fundamentally convert electrical energy into thermal energy, to start off an explosive chemical reaction. Obviously, the activation of those devices shall not happen by accident or, even worse, by intentional exogenous influence. From an ordinary differential equ
J. Aerosp. Technol. Manag.. Publicado em: 2012-03
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7. Thermal effusivity estimation of polymers in time domain
An accurate knowledge of thermophysical properties is very important, for example, to optimize the engineering design and the development of new materials for many applications. Thermal effusivity is a thermal property which presents an increasing importance in heat conduction problems. This property indicates the amount of thermal energy that a material is
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2011-12
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8. Thermal conductivity of gas by pulse injection techniques using specific thermal conductivity detector (TCD)
Este artigo apresenta um procedimento para determinar a condutividade térmica de gases através de injeção por pulso, utilizando um detector de condutividade térmica (TCD). As medidas foram efetuadas à 323K e pressão atmosférica, com um sensor de filamento de tungstênio de 160 Ω. Através de aproximações bem definidas, foi possível transformar um
Publicado em: 2010
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9. Conversor CC/CA de alta freqüência baseado em inversores ressonantes com comutação seqüencial para excitação de uma tocha indutiva a plasma térmico
This work describes the study, the analysis, the project methodology and the constructive details of a high frequency DC/AC resonant series converter using sequential commutation techniques for the excitation of an inductive coupled thermal plasma torch. The aim of this thesis is to show the new modulation technique potentialities and to present a technologi
Publicado em: 2010
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10. Desenvolvimento de biossensores eletroquímicos, utilizando matriz polimérica modificada com biomoléculas, para o diagnóstico de câncer de próstata e hepatite C
The development of biologic sensors has become a wide activity in science seeking mainly health and environmental issues. The biosensor development in laboratory has been investigated by many researchers seeking sensitivity, specific, low cost and portable devices. The electrochemical techniques are used in the largest number of works due to the easiness in
Publicado em: 2010
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11. Caracterização térmica, grau de conversão, resistência à flexão e dureza de compósitos comerciais tratados termicamente / Thermal characterization, degree of conversion, flexural strength and Knoop hardness of heat treated commercial composites
Visando otimizar as propriedades químicas e mecânicas de compósitos de uso direto aplicados na forma indireta, associados a tratamentos térmicos experimentais (TT), torna-se necessária uma caracterização térmica que permita a determinação de uma temperatura de TT segura (abaixo da temperatura de início de perda de massa). Assim, a primeira etapa d
Publicado em: 2010
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12. DIVISORES DE FREQÜÊNCIA POR DOIS PARAMÉTRICOS BALANCEADOS A PHEMT PARA RECEPTORES DE DEFESA ELETRÔNICA / PHEMT BALANCED PARAMETRIC FREQUENCY DIVIDER BY TWO FOR ELECTRONIC DEFENSE RECEIVERS
This work assesses the development of PHEMT balanced parametric frequency dividers by two, intended for application as frequency converters on Electronic Defense digital receivers. The main characteristics of these devices are design simplicity, reduced number of components, possibility of integration in MMIC, phase coherence, wide bandwidth, very good pulse
Publicado em: 2009