Based on Christensen model the Reynolds equations on steady-state and perturbed-state are built . The effect of surface roughness on oil film characteristics is analyzed taking into account the effect of fluid inertia and compressibility .

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The problem of torsional vibration of elliptical column partially submerged in water is studied with the effects of surface wave and compressibility of water .

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Some structure parameters such as surface density thickness porosity and main properties such as breaking strength heat retention compressibility permeability are measured .

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