INTRODUCTION Interbody fusion requires a structural member to carry load while the autograft or osteoinductive agent stimulates bone formation. In the present study, we evaluated the potential use of extracted nucleated cells from bone marrow mixed in hyaluronic acid gel as an osteoinductive agent, in comparison to Collagraft loaded with nucleated cells or rhBMP-2 in the porous tantalum ring, i...

Tantalum polyhedral oligosilsesquioxane (POSS) complexes have been synthesised and characterized. X-ray structures of these complexes revealed that the coordination number of the tantalum center greatly affects the cube-like silsesquioxane framework.

Tantalum oxide is a compound with attractive properties and important applications in optoelectronis. It has a high refractive index and a good thermal and chemical stability. Tantalum oxide thin layers have been deposited by laser ablationpulsed laser deposition (PLD) and radiofrequency assisted pulsed laser ablation (RF-PLD) starting from a Tantalum metallic target in oxygen atmosphere. In th...

Hexakis(2,6-diisopropylphenylisocyanide)tantalum is the first isocyanide analogue of the highly unstable Ta(CO)6 and represents the only well-defined zerovalent tantalum complex to be prepared by conventional laboratory methods. Two prior examples of homoleptic Ta0 complexes are known, Ta(benzene)2 and Ta(dmpe)3 , dmpe=1,2-bis(dimethylphosphano)ethane, but these have only been accessed via liga...

Submicron tantalum pentoxide ridge and channel optical waveguides and microring resonators are demonstrated on silicon substrates by selective oxidation of the refractory metal, tantalum. The novel method eliminates the surface roughness problem normally introduced during dry etching of waveguide sidewalls and also simplifies fabrication of directional couplers. It is shown that the measured pr...

Fine-grained tungsten carbide copper (WC-Cu) cemented carbide was sintered via spark plasma sintering at 1773K using a fine WC powder with a mean particle size of 0.11 mm. The mechanical properties were compared with tungsten carbide cobalt (WC-Co) cemented carbide and a binderless WC-sintered material. The Vickers hardness and fracture toughness obtained by the indentation fracture method for ...

This study focuses on the effects of different temperatures and temperature cycling on breakdown voltages of tantalum capacitors. High and low temperature tests and temperature cycling tests were done. In all tests the used temperatures were inside component’s operating temperature limits. After the tests, capacitors were tested for their breakdown voltage. According to results of this research...

Titanium carbide is used as an attractive reinforcement to produce particulate metal matrix composites. One of the problems to use this carbide as a reinforcement in copper-based composites is the lack of wetability in Cu-TiC system. This property improves as the C/Ti ratio in carbide decreases.&#10Problems to use this carbide as a reinforcement in copper-based composites is the lack of wetabii...

The objective of this contract was the study of rocket faikire mechanisms in conjunction with the development of nozzle materials for solid propellant motors. Study of graphite comprised the major part of the program, with emphasis on erosion mechanisms. Commercial and experimental graphite grades were tested in an oxy-acetylene torch and the effects of graphite purity, density, orientation and...