The production method of composite material having a large amount of porosity, relatively high-strength and small dimensional change during sintering has been proposed by the authors. The composite material can be obtained by sintering a mixture of metal powder and ceramic powder containing vanishing binder in the oxidizing atmosphere. And it is already employed as molds for vacuum forming of plastic sheets and molding of ceramics utilizing its permeability of air and water.In this report, the sintering behavior and the mechanical properties of this composite material was examined with the use of iron powder as metal powder and mullite powder as ceramic powder. It was clarified that iron changes into a-Fe2O3 during sintering process, and the interaction of expansion and shrinkage of iron particles caused by oxidation and sintering produces relatively high strength and small dimensional change. The sintered body consists of twe layers, outer sintered hard layer has high strength and smooth surface, and inner non-sintered layer has large porosity and superior permeability. It is an advantageous feature for the mold of several forming and molding process.
Porous metal which has one directional porosity perpendicular to the surface, can be produced by the combination of slurry casting and fiber planting. First, fine short metal fiber is planted on the surface by electrostatic fiber planting, i.e.flocking and secondly metal powder slurry including ethyl silicate binder is casted on the fiber planted surface. At the subsequent sintering, metal powder is melted and infiltrated into metal powder matrix, which yieds long and one directional pores. Here, Cu fiber and Fe powder are used and electric coinductive vacuum chuck for grinding was experimentally producted.
This paper is concerned with information dynamics in FIFA Women’s World Cup Germany 2011 Final Japan vs. America. It has been conrmed that though Japan wins the game America keeps the advantage through the game, and so Japan’s victory is miraculous. It is concluded that invincible attachment to the holy victory plays a crucial role in this historical Soccer game.
This paper is concerned with the history of the Shichika Canal construction works in Japan, which have been carried out since the twelfth century to benefit the people living in the Tedori alluvial fan. The history can be demarcated into three periods. The first period started at the end of the twelfth century and ended in 1903, after Gonbei Eda made a success of digging the five water intake holes at the Akudo Pool, feeding sufficient water to the Togashi and Go channels. The second period began when the Grand Water Gate was completed in 1903 and ended in 1962, when the third period started with the division of the Shichika Canal into three groups. With this grouping, the management and administration of the Shichika Canal have become not only efficient but also effective. Water diversion by means of an inverted siphon from the Shichika Canal to the Miyatake channel has made the canal much more valuable, for, by covering the part of the Kakehashi basin aside from the Tedori and Sai basins, the irrigation area has been increased by approximately 25%.
