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The character of changes in the cellulose supramolecular structure during hydration
Abstract
The character of variations in the supramotecular structure and hydrophilic properties of the cotton and wood celluloses during its moistening was investigated using methods !H-NMR relaxation and sorption measurements. The results indicate the dispersion of the cellulose crystallites and formation of additional capillary-porous system, which leads to increasing in the specific surface during the adsorption process.
On the basis of a numerical method for viscous gridless vortex domains investigated nonstationary tionary-vortex interaction submerged axisymmetric air jets with thin permeable screens. Ring vortex identified clots forming in front of the jet during its penetration through the permeable screens with varying degrees of permeability. We study the corresponding non-stationary distribution of pressure drop across the porous borders.
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