Thermal Properties Identification
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. Study of Microstructure and Thermal Properties of the Low Melting Bi-In-Sn Eutectic Alloys
Beside their technological importance in soldering, the low melting eutectic alloys based on bismuth and indium have potential for commercial application in the field of phase-change materials (PCMs). In this respect, the knowledge of their microstructure and thermal properties such as melting temperature, latent heat of melting, supercooling tendency, therm
Mat. Res.. Publicado em: 11/10/2018
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2. Applicability of FT-IR Techniques and Goniometry on Characterization of Carbon Fiber Surfaces
ABSTRACT Carbon fibers have been widely used as structural reinforcement in aeronautical composites, because of their exceptional mechanical properties. However, carbon fibers present few polar groups on their surfaces inducing a weak interaction with some thermosetting and thermoplastic matrices. Surface treatments, such as thermal and electrochemical oxida
J. Aerosp. Technol. Manag.. Publicado em: 2016-03
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3. Photodegradation of a polypropylene filled with lanthanide complexes
This research aims at studying the photodegradation of a polypropylene formulation filled with lanthanide complexes. These complexes can be used as tracers for the identification of polymer materials in order to facilitate an high speed automatic sorting of plastic wastes for an economically efficient recycling. By paying attention to the evolution of carbon
Polímeros. Publicado em: 04/12/2015
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4. Ni(II), Cu(II), AND Zn(II) COMPLEXES DERIVED FROM A NEW SCHIFF BASE 2-((Z)-(3-METHYLPYRIDIN-2- YLEIMINO)METHYL)PHENOL AND SYNTHESIS OF NANO SIZED METAL OXIDE PARTICLES FROM THESE COMPOUNDS
Synthesis, spectral identification, and magnetic properties of three complexes of Ni(II), Cu(II), and Zn(II) are described. All three compounds have the general formula [M(L)2(H2O)2], where L = deprotonated phenol in the Schiff base 2-((z)-(3-methylpyridin-2-yleimino)methyl)phenol. The three complexes were synthesized in a one-step synthesis and characterize
Quím. Nova. Publicado em: 2015-11
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5. Durability under thermal loads of polyvinyl alcohol fibers
In the present paper, the thermal durability of polyvinyl alcohol fibers (PVA) was studied after fiber samples had been subjected to temperatures ranging from 90°C to 250°C. Residual mechanical properties, such as tensile strength, elastic modulus and elongation at break, and physical properties, such as density were determined. Weibull statistics were use
Matéria (Rio J.). Publicado em: 2013-12
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6. Estudos de simulação computacional do processo de redução de UF4 a Urânio metálico / computational simulation studies of the reduction process of UF4 to metallic uranium
The production of metallic uranium is essential for production of fuel elements for using in nuclear reactors manufacturing of radioisotopes and radiopharmaceuticals. In IPEN, metallic uranium is produced by magnesiothermical reduction of UF4. This reaction is performed in a closed graphite crucible inserted in a sealed metal reactor and no contact with the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2010
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7. Estudo das propriedades opto-eletrônicas de micro-cristais de rubi / Study of opto-electronics properties of ruby micro-crystals
Films of amorphous aluminum-nitride (AlN) were prepared by conventional radio frequency sputtering of an Al+Cr target in a plasma of pure nitrogen. The Cr-to-Al relative area determines the chromium content, which stayed in the ~ 0 3.33 at.% concentration range in the present study. Film deposition was followed by thermal annealing the samples up to 1050 ºC
Publicado em: 2010
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8. Identification of temperature-dependent thermal properties of solid materials
This work proposes an experimental technique for the simultaneous estimation of temperature-dependent thermal diffusivity, α, and thermal conductivity, λ, of insulation materials. The thermal model used considers a transient one-dimensional heat transfer problem. The determination of these properties is done by using the principle of the Mixed technique. I
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2008-12
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9. Development of the Part Heat Plate Method to Estimate Simultaneously Thermal Properties without Heat Flux Transducer / Desenvolvimento do método de aquecimento plano parcial para a determinação simultânea de propriedades térmicas sem o uso de transdutores de fluxo de calor
Desenvolve-se, neste trabalho, uma técnica experimental que permite a obtenção da difusividade e da condutividade térmica de materiais condutores e não condutores através do uso de elementos de aquecimento e de técnicas de estimativas de funções para a obtenção do fluxo de calor imposto. O princípio básico do procedimento é dividido em: i) dese
Publicado em: 2008
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10. Estudo do comportamento ao desgaste e corrosÃo dos aÃos inoxidÃveis AISI 316L e AISI 420 depositados pelo processo de aspersÃo tÃrmica a arco elÃtrico
Mechanical components behavior in service, are extremely dependent on the surface quality, the contact between areas and the environment where they are applied. Particularly, corrosion and ware damage, directly and indirectly, mechanical components surface that result in rise production and maintenance cost due to no programmed equipments stops to repair or
Publicado em: 2007
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11. Measurement of thermophysical properties of ceramics by the flash method
The flash method, proposed by Parker, Butler, Jenkins and Abbott from the U.S. Navy Radiological Defense Laboratory in 1961, is the most popular method for measuring the thermal diffusivity of solids. In this method, the front surface of a small sample is subjected to a very short burst of radiant thermal energy. The resulting temperature rise on the opposit
Brazilian Archives of Biology and Technology. Publicado em: 2006-01
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12. Determinação simultânea da condutividade térmica e da difusividade térmica variando com a temperatura / Identification of yemperature - dependent simultaneous thermal properties of Polyvinyl Chloride (PVC)
This work proposes an experimental technique for simultaneous estimation of temperaturedependent thermal diffusivity, α and thermal conductivity, λ of insulation materials. The thermal model used considers a transient one-dimensional heat transfer problem. In this model a heat flux is imposed on the frontal surface and the sample is isolated on the
Publicado em: 2005