ZnO nanowires have been synthesized on porous silicon substrates with different porosities via the vapour-liquid-solid method. The texture coefficient analysed from the XRD spectra indicates that the nanowires are more highly orientated on the appropriate porosity of porous silicon substrate than on the smooth surface of silicon. The Raman spectrum reveals the high quality of the ZnO nanowires....

This study evaluated the mechanical strength correlated to percentage of total volume weld and porosities Co-Cr alloy joints welded with TIG technique. Thirty specimens were perpendicularly sectioned long-axis rejoined by using X30-shaped joint design welding. They divided into 3 groups (n=10): CG1 a 60-A depth 90-ms pulse; CG2 120-ms pulse CG3 160-ms pulse. The submitted nondestructive tests: ...

The application bottleneck of laser welding is being gradually highlighted due to a high prevalence porosity. Although technology has been well applied in fields such as vehicle body manufacturing, the suppression weld porosity stainless steel containers pharmaceutical industry still challenging. bottom was investigated by applying ultrasonic vibration, changing positions and optimizing shieldi...

This study focuses on the role played by interparticle and interlayer porosities, preferred orientation of particles water diffusion in dual-porosity clayey media (i.e., swelling clay minerals). For this purpose, we use Na-vermiculite, a that does not exhibit osmotic therefore allows clear discrimination between porosities. Two samples were prepared with an equal proportion porosities 0.25 each...

in this study, based on a biomimetic approach, novel 3d biodegradable porous hybrid scaffolds consisting of chitosan, gelatin, and tricalcium phosphate were developed for bone and cartilage tissue engineering. macroporous chitosan/ gelatin/β-tcp scaffolds were prepared through the process of freeze-gelation/solid-liquid phase separation. the results showed that the prepared scaffolds are highly...

Introduction: Chondrites have been compared to terrestrial sandstones, formed by the physical accumulation of unrelated grains followed by a lithification process. Tectonics and the simple weight of overlying layers provide the conditions for lithification of sandstones on Earth. What plays this role on meteorite parent bodies? Present day asteroids cannot compact meteorites by their own self-g...

The aim of the present study was to observe the performance of Ti-25Nb alloys with various porosities as femoral stem prostheses in a rabbit model, thus providing basic experimental evidence for the development of porous prostheses. The porous Ti-25Nb alloy prostheses were designed according to the morphology of the medullary cavity. These prostheses were placed into the femoral medullary cavit...

OBJECTIVES The objective of this study is to develop a Ti fibre knit block without sintering, and to evaluate its deformability and new bone formation in vivo. MATERIAL AND METHODS A Ti fibre with a diameter of 150 μm was knitted to fabricate a Ti mesh tube. The mesh tube was compressed in a metal mould to fabricate porous Ti fibre knit blocks with three different porosities of 88%, 69%, and ...