Results 241 to 250 of about 754,315 (292)
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Thermal diffusivity imaging with the thermal lens microscope
Applied Optics, 2011A coaxial thermal lens microscope was used to generate images based on both the absorbance and thermal diffusivity of histological samples. A pump beam was modulated at frequencies ranging from 50 kHz to 5 MHz using an acousto-optic modulator. The pump and a CW probe beam were combined with a dichroic mirror, directed into an inverted microscope, and ...
Oluwatosin O, Dada +2 more
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Thermal Diffusion and Convective Stability
The Physics of Fluids, 1972The stability of a two-component fluid layer subjected to a temperature gradient has been studied, and the associated thermal diffusion separation has been found to exert a large influence even when the separations are small. The most unexpected and perhaps important result is that an instability has been found which can give rise to convection ...
Schechter, R. S. +2 more
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Thermal diffusivity of dental cements*
Australian Dental Journal, 1986AbstractA transient method for measuring the thermal diffusivity of disc‐shaped specimens of dental cements is presented.
O, Baffa +3 more
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Physical Review Letters, 2005
The Ludwig-Soret effect or thermal diffusion, which refers to the separation of liquid mixtures in a temperature gradient, is governed by a nonlinear, partial differential equation in space and time. It is shown here that the solution to the nonlinear differential equation for a binary mixture predicts the existence of shock waves completely analogous ...
Sorasak, Danworaphong +3 more
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The Ludwig-Soret effect or thermal diffusion, which refers to the separation of liquid mixtures in a temperature gradient, is governed by a nonlinear, partial differential equation in space and time. It is shown here that the solution to the nonlinear differential equation for a binary mixture predicts the existence of shock waves completely analogous ...
Sorasak, Danworaphong +3 more
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Thermal Diffusivity Measurements of Thermographite
International Journal of Thermophysics, 2004This paper presents results of measurements of a graphite proposed to serve as a thermophysical property reference or standard reference material. The reported measurements contribute to a program launched in 1999 by Anter Corp. with the objective to provide a replacement for the NIST thermal property reference material RM AXM-5Q graphite whose ...
Maglic, KD, Milošević, Nenad D.
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Thermal diffusion of Boussinesq solitons
Physical Review E, 2007We consider the problem of the soliton dynamics in the presence of an external noisy force for the Boussinesq type equations. A set of ordinary differential equations (ODEs) of the relevant coordinates of the system is derived. We show that for the improved Boussinesq (IBq) equation the set of ODEs has limiting cases leading to a set of ODEs which can ...
Edward, Arévalo, Franz G, Mertens
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The FJO thermal diffusion column theory and the thermal diffusion factor
Journal of Physics A: General Physics, 1971It is shown that by proper choice of a reference temperature in the theoretical expression for the separation factor for a thermal diffusion column, the separation factor may be made to depend on the potential model and the interaction parameters solely through the thermal diffusion factor, the other terms in the expression becoming independent of the ...
J M Saviron +3 more
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Mass and Thermal Diffusivity Algorithms
Annals of the New York Academy of Sciences, 2002Abstract: Mass and thermal diffusivity measurements conducted on Earth are prone to contamination by uncontrollable convective contributions to the overall transport. Previous studies of mass and thermal diffusivities conducted on spacecraft have demonstration the gain in precision, and lower absolute values, resulting from the reduced convective ...
R Michael, Banish +4 more
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Diffusion and Thermal Diffusion in Ne–CO2
The Physics of Fluids, 1961Values of the thermal diffusion factor αT and the ordinary diffusion coefficient D for Ne–CO2 mixtures have been measured over a temperature range of about −78° to 350°C by using the radioactive tracer C14O2. The thermal diffusion factor exhibits an unusual negative temperature dependence similar to that for Ar–CO2 mixtures.
Stanley Weissman +2 more
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Thermal Diffusion and Self-Diffusion in Ammonia
The Journal of Chemical Physics, 1966The temperature dependence of the isotopic thermal-diffusion factor α0 for ammonia has been investigated with the help of an equimolar mixture of 14NH3 and 15NH3. A 10-tube metal swing-separator as well as a two-bulb glass apparatus were used for these measurements.
R. Paul, W. W. Watson
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