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## Abstract The characteristics of evapotranspiration and canopy surface conductance of winter wheat have been measured and analysed by using the Bowen ratioβenergy balance (BREB) method. In order to understand better the effect of soil water status on evapotranspiration and conductance of wheat, t
The interface geometry of Vycor porous glass was examined by adsorption of water in conjunction with small-angle scatterwhere a is a constant and Q is the scattering vector. ing of X rays and neutrons. When the sample is dry, a fractal The X-ray result indicates that the surface geometry of dry Vyc
Surface-sensitive x-ray analysis techniques are explained. Using grazing-exit geometry, structural information about a sample surface could be obtained by measuring the angular distribution of x-ray fluorescence or x-ray diffraction intensity. A model based on the reciprocity theorem was used and it