Results 261 to 270 of about 31,892 (296)

Effects of Fiber Shapes on Moisture Diffusion Coefficients

Journal of Reinforced Plastics and Composites, 1993
Diffusion coefficient is an important parameter used for theoretical estima tion of moisture content in a body when it is exposed to a moist environment. The diffu sion coefficient of FRP materials usually depends on several parameters, such as the diffusivities of constituents, fiber volume fraction, moisture concentration of the environ ment, and ...
P.K. Aditya, P.K. Sinha
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Effect mechanism of moisture diffusion on LED reliability

3rd Electronics System Integration Technology Conference ESTC, 2010
High power light-emitting diodes (LED) are widely applied in many fields for their special advantages compared with other light sources. Many researches on LED reliability have been conducted in order to build the better LED design. However, seldom detailed reasons for the LED performance degradation are illustrated in the previous research when LED ...
Bulong Wu, Xiaobing Luo, Sheng Liu
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The influence of the soret and dufour effects on the diffusion of heat and moisture in solids

International Journal of Engineering Science, 1980
Abstract Phenomenological arguments leading to coupled equations governing simultaneous diffusion of moisture and heat in a solid are presented. The coefficients are related to basic thermodynamic properties of the solid, including the heat of transport associated with the Dufour effect. By Onsager's reciprocal relations, the reciprocal Soret effect,
Hartranft, R. J., Sih, G. C.
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The Effect of Path Diffusion on The Effective Moisture Diffuslvlty in Carrot Slabs

Drying Technology, 1997
ABSTRACT In order to evaluate the effect of path diffusion on the average moisture diffusivity in carrot. drying curves for different shaves (slices and cylinders) and temperatures of 50, 60 and 70°C were ohtained takine into consideration the use of an average leneth of carrot sample (slice thickness or the cylinder radio). The.
M.A. Ruiz-Cabrera, M.A. Salgado-Cervantes, K.N. Walislewski-Kubiak, M.A. y Garcίa-Alvarado   +3 more
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Prediction of the effective moisture diffusivity in gelatinized food systems

Journal of Food Engineering, 1993
Abstract Gelatinized food systems develop a porous structure during dehydration; therefore, the moisture diffusivity calculated from such experiments should be considered as an effective diffusion coefficient. In this work, the effective moisture diffusivity of gelatinized starches was determined from drying experiments using the method of slopes.
G.K. Vagenas, V.T. Karathanos
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The Effect of Pressure on Moisture Diffusion in Polymer Matrix Composites

International Journal of Thermophysics, 2012
Temperature and humidity play a significant role in the mechanical behavior and long-term durability of polymer matrix composites (PMCs). Several standard test methods including some accelerated test methods involving higher temperatures and pressures are available for environmental qualification of these PMCs.
S. P. Pilli, L. V. Smith
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The Effect of Stress Whitening on Moisture Diffusion in Thermosetting Polymers

The Journal of Adhesion, 1993
Abstract The effects of stress whitening on the moisture diffusion rate and concentration in a polymer adhesive containing a secondary phase were investigated. This was accomplished by performing an absorption test on both stress whitened and virgin samples of the bulk adhesive and comparing the rate and amount of moisture diffusion in each.
Erol Sancaktar, David R. Baechtle
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THE EFFECT OF MOISTURE ON PHOSPHORUS DIFFUSION IN COAL MINE SPOILS

Soil Science, 1980
Phosphorus diffusion coefficients (D) have been measured as a function of water tension (Psi) and water content (theta) in topsoil and spoil samples from two coal mine sites in western North Dakota. For all four soils, the observed dependence of D upon Psi and theta can be well described by equations of the form D = Ae/sup -aphi/ + B and D = K (theta-E)
J. W. HARRELL, M. SAEED
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Effect of porosity on moisture diffusion during drying of pasta

Journal of Food Engineering, 1996
Abstract Heat and mass transfer studies were conducted with pasta cylinders at different porosities, temperatures and pressures. Tests with pasta cylinders were conducted at porosities of 6 and 26%, temperatures of 40, 55, 71 and 105 °C and total pressures of 77, 101 and 202 kPa.
Kurt M. Waananen, Martin R. Okos
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The coupling effect of drying shrinkage and moisture diffusion in concrete

Computers and Concrete, 2006
Drying shrinkage of concrete occurs due to the loss of moisture and thus, it is controlled by moisture diffusion process. On the other hand, the shrinkage causes cracking of concrete and affects its moisture diffusion properties. Therefore, moisture diffusion and drying shrinkage are two coupled processes and their interactive effect is important for ...
A. Suwito, Ayman Ababneh, Yunping Xi, Kaspar Willam   +3 more
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