The Reference Collection of Annual Meeting

The cloning is one of the most promising biotechnologies today. The project aims to automate every process required in the cloning, i.e. cutting, removing, filtering, assembling and fusing, on the basis of micro robotics technology. The processes are performed on a micro chip consisting of micro channels and chambers in which egg cells and membranes flow and are manipulated. A whole system would be small and compact enough to be fit on desk top to meet various demands in biotechnology. The objectives, the overview and the current progress will be introduced in this keynote.

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Rapidly solidified non-combustive magnesium alloy (AMX602; Mg-6Al-0.5Mn-2Ca/mass%) powders were prepared by SWAP method, one of the water-atomization processes. They revealed very fine α-Mg grains less than 500nm, and contained Al_2Ca and Al-Mn intermetallic compounds having a mean particle size of 100〜300 nm. Their magnesium alloy powders were consolidated by cold compaction, and served to hot extrusion after heating at 573K〜673K in argon gas atmosphere. AMX602 cast ingot was also applied to hot extrusion. Furthermore, the machined chips from the cast ingot were compacted at room temperature, and consolidated into a full density by hot extrusion. The dependence of microstructural and mechanical responses on the fabrication process conditions, such as raw materials and extrusion temperatures, was evaluated. The extruded AMX602 alloys using rapidly solidified powders indicated yield stress of 351MPa and elongation of 13.5%, which were superior to the wrought alloys using cast ingot materials. The extremely high strength was due to the α-Mg grain refinement less than 0.8μm of the extruded alloys. Such fine microstructures caused grain boundary sliding, and resulted in a good elongation to failure.

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The effects of the crack-healing on contact strength were investigated for Si_3N_4/SiC which was subjected to various machining process. The evaluation of contact strength was done by sphere indentation test that used acoustic emission (AE) together. As a result, the contact strength of Si_3N_4/SiC was improved by crack-healing with a combination of rapping even for the material that had machining cracks induced by a heavily machining process.

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Fullerene nanofibers are the new linear form of nanocarbon that has been developed recently. This paper will show the basic properties of C_60 nanowhiskers and C_60 nanotubes for their potential applications in energy devices such as fuel cells and solar cells.

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