Miscible displacement in fractured-porous media (theory and experiments)
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The hydrodynamical theory of the miscible displacement in fractured-porous media (FPM) that describes convective, gravitational, diffusive mechanisms of the recovery from blocks and hydraulic interaction between blocks and cracks is developed. The solution of the inverse problem is obtained to determine FPM properties from data from laboratory displacement.A new post-treatment technique that Ni-P alloy coatings can be sealed at ambient temperature by chemical method has been investigated and developed. By using the Ni-P alloy coatings with different time of plating, the coatings with different porosity were stimulated, then the porosity of the coatings was detected by standard porosity detection method. The results show the porosity of the coatings decreased greatly after the coatings were sealed. The potentiodynamic polarization curves of the sealed and unsealed coatings indicated that the corrosion potential of the sealed coatings shifted towards positive direction and corrosion current density decreased. The SEM morphology of the sealed coatings confirmed that there was a protective film on the surface of the Ni-P alloy coatings, which effectively sealed the pores of the coatings.
Plating (geology)
Conversion coating
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Using pure Ti powder with particle sizes from 300 to 500 \\micron prepared by the plasma rotating electrode process (PREP), porous pure Ti compacts for biomedical applications were synthesized by powder sintering, and microstructures and mechanical properties of the compacts were investigated in this study. Porous compacts having porosity of 19–35 vol% are successfully fabricated by controlling sintering condition. It is found that Young's modulus and compressive yield strength decrease linearly with increasing porosity, and porous Ti compacts having porosity of about 30–35 vol% exhibit identical Young's modulus of human bone.
Titanium powder
Powder Metallurgy
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Convective instability
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AbstractA multilayered titanium (Ti)–hydroxyapatite (HA) functionally graded material was produced via pressureless sintering at 1100°C. The initial and final porosities were determined via shrinkage measurements. The final porosity verification was carried out by the Archimedes method. The experimental porosity measurements were compared with two proposed models. The macroscopic and microstructure features and the measured porosities confirmed that the volume fraction porosity was associated with both matrix and reinforcing particles in all cases. The percolation threshold was observed at x = 0·75 in the xTi+(1−x)HA mixture.Keywords: Percolation thresholdPorosity reduction modelShrinkage measurement
Shrinkage
Volume fraction
Percolation (cognitive psychology)
Matrix (chemical analysis)
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Enclosure
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Adjoint equation
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Viscous liquid
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