Volumetric Variation
Mostrando 1-12 de 49 artigos, teses e dissertações.
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1. Influência do Regime Transiente Sobre a Microdureza e Microestrutura nos Aços ASTM-A36 e SAE-1045 Soldados pelo Processo MAG
Resumo O regime quase-estacionário pode não ser alcançado em soldagens a arco elétrico de peças de pequenas dimensões e/ou de materiais de maior condutividade térmica. Entretanto, o regime transiente sempre ocorrerá no início e no final da soldagem. Neste regime, a variação do fluxo de energia via calor pode promover variações microestruturais e
Soldag. insp.. Publicado em: 08/08/2019
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2. Longitudinal and Transverse Variation in the Physical Properties of Wood Red Tauari
ABSTRACT The objective of this work was to study the fiber length variation, retractability and basic density, in the core-bark direction and along the heig of the red tauari wood (Cariniana micrantha Ducke). The stem was evaluated in the discs, from core to bark, corresponding to 0%, 25%, 50%, 75% and 100%. At the commercial height of the tree the evaluatio
Floresta Ambient.. Publicado em: 15/07/2019
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3. EQUAÇÕES LINEARES E NÃO LINEARES PARA PREVER O COMPORTAMENTO DE PROPRIEDADES FÍSICO-QUÍMICAS DE COMBUSTÍVEL DE AVIAÇÃO MISTURADO COM BIOQUEROSENE DROP-IN ALTERNATIVO
Density, viscosity and calorific values are important physical properties to affect the utilization of biofuel. In this work, mixtures of farnesane and a “jet fuel”, QAv-1, were used to study the variation of density and kinematic viscosity as a function of the volumetric fraction of farnesane and temperature. Experimental measurements were carried out f
Quím. Nova. Publicado em: 2019-01
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4. Effect of Hot Deformation on Microstructure, Hardness and Precipitation Kinetics in a C350 Maraging Steel Modified by Titanium Addition
Maraging steels are alloys with a good balance between strength and fracture toughness. These properties are obtained by quenching and aging treatments, where the precipitation of intermetallic compounds is promoted in a martensitic matrix. In this context, this paper aims to evaluate the effect of hot deformation on microstructure, kinetics and formation of
Mat. Res.. Publicado em: 17/09/2018
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5. Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
Abstract High levels of shrinkage stress caused by volumetric variations during the activation process are one of the main problems in the practical application of composite resins. Objective The aim of this study is to reduce the shrinkage stress and minimize the effects caused by composite resin volumetric variation due to the photopolymerization. In thi
J. Appl. Oral Sci.. Publicado em: 18/06/2018
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6. CHARACTERIZATION AND EVALUATION OF WAXY CRUDE OIL FLOW
Abstract Part of the oil found in the Brazilian subsoil has a high wax content, which makes its flow process difficult at low temperatures because of the increase in the viscosity of the fluid. This paper studied the flow behavior of waxy crude oil under variation in the temperature of the external environment of the flow, the volumetric flow rate of the oil
Braz. J. Chem. Eng.. Publicado em: 2016-12
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7. Generation of 3D ultrasound biomicroscopic images: technique validation and in vivo volumetric imaging of rat lateral gastrocnemius
Introduction Ultrasound biomicroscopy (UBM) is a technique for generating high-resolution images, with frequencies from 20 MHz to 100 MHz. For example, it has been used in animal research related to models of injury and diseases that mimic human conditions. With a three-dimensional ultrasound (3D) image system, an organ can be viewed at various angles and t
Res. Biomed. Eng.. Publicado em: 2015-04
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8. APPLICATION OF NANOFLUIDS IN SECONDARY REFRIGERATION SYSTEMS / APLICAÇÃO DE NANOFLUIDOS EM SISTEMAS SECUNDÁRIOS DE REFRIGERAÇÃO
The application of nanofluids as secondary fluids in vapor compression refrigeration systems is studied with the development of a lumped-parameter thermodynamic model. When a nanofluid is used as a heat transfer fluid, its thermal conductivity and viscosity increase, when compared with the corresponding properties of the base fluid. The irreversibilities due
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/05/2012
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9. Structural alterations of foreskin caused by chronic smoking may explain high levels of urethral reconstruction failure using foreskin flaps
OBJECTIVES: The aim of the present study was to perform a stereological and biochemical analysis of the foreskin of smoker subjects. MATERIALS AND METHODS: Foreskin samples were obtained from 20 young adults (mean = 27.2 years old) submitted to circumcision. Of the patients analyzed, one group (n = 10) had previous history of chronic smoking (a half pack to
Int. braz j urol.. Publicado em: 2012-08
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10. Estudos preliminares de produção de ácido glucônico a partir de sacarose invertida em biorreator airlift
The use of sucrose for the production of industrial inputs with higher added value has a great industrial interest, especially glucose and fructose which present many advantages over sucrose in industrial processes. Gluconic acid and its derived salts can be mentioned as second generation products also having wide industrial applicability. This study aimed t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/12/2011
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11. FormulaÃÃo MatemÃtica para CÃlculo de VariaÃÃo de ConcentraÃÃo em Escoamento EstacionÃrio / Mathematical Formulation For The Calculation Of Changes Of Concentration In Stationary Flow.
The main aim of this research is to evaluate a variation of concentration between the affluent and effluent in a biophysical or physicochemical system. The theoretical system of references used here was based upon a differential equation of steady flow, involving a chemical kinetics and a longitudinal dispersion, in which there is a number of sufficiently lo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/07/2011
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12. Reproductive ecology and diet of Cnemidophorus ocellifer Spix 1825 (Squamata: Teiidae) in a coastal area from northeastern Brazil / Ecologia reprodutiva e dieta de Cnemidophorus ocellifer Spix 1825 (Squamata: Teiidae) em Ãrea de tabuleiro no nordeste do Brasil
Chapter 1:Reproduction of Cnemidophorus ocellifer was studied based on data collected from September 2009 to August 2010 in a coastal area of the SÃo GonÃalo do Amarante municipality, CearÃ, Brazil. Lizards were captured by manual collection, with the aid of pressure rifle or tourniquet and, after dead, individuals were dissected for sex determination by
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/02/2011