Thermal Conductivity Measurement
Mostrando 13-18 de 18 artigos, teses e dissertações.
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13. Determinação da condutividade termica e da resistencia mecanica em argamassa leve
This work deals the determination of the thermal conductivity and the mechanical strength in light mortar with soft aggregate, evidencing the features term-insulators of the composite and analysis of the main aspects of the cement composite, concerning to its mechanical characteristics. The procedure adopted for determination of thermal conductivity, has the
Publicado em: 2000
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14. Analysis of error in temperature measurement.
This work presents the numerical investigation of temperature measurement error using thermocouple for different configurations utilizing a computational tool based on finite element method (Galerkin Method). The numerical code performs a two-dimensional analysis while most of the analytical models are one-dimensional. The results are then compared with the
Publicado em: 2000
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15. Measurement of anisotropic energy transport in flowing polymers by using a holographic technique
Almost no experimental data exist to test theories for the nonisothermal flow of complex fluids. To provide quantitative tests for newly proposed theories, we have developed a holographic grating technique to study energy transport in an amorphous polymer melt subject to flow. Polyisobutylene with weight-averaged molecular mass of 85 kDa is sheared at a rate
National Academy of Sciences.
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16. Rapid Method for the Radioisotopic Analysis of Gaseous End Products of Anaerobic Metabolism
A gas chromatographic procedure for the simultaneous analysis of 14C-labeled and unlabeled metabolic gases from microbial methanogenic systems is described. H2, CH4, and CO2 were separated within 2.5 min on a Carbosieve B column and were detected by thermal conductivity. Detector effluents were channeled into a gas proportional counter for measurement of rad
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17. Measurement of cardiac output in man with a nonrecirculating indicator
The present investigation was undertaken to evaluate the utility of constant-rate injection of a nonrecirculating indicator (H2) for the measurement of cardiac output in man. 42 patients were studied during cardiac catheterization and 8 during acute complications of arteriosclerotic heart disease, including acute myocardial infarction. Pulmonary (or systemic
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18. Measurement of inherent particle properties by dynamic light scattering: introducing electrorotational light scattering.
Common dynamic light scattering (DLS) methods determine the size and zeta-potential of particles by analyzing the motion resulting from thermal noise or electrophoretic force. Dielectric particle spectroscopy by common microscopic electrorotation (ER) measures the frequency dependence of field-induced rotation of single particles to analyze their inherent di