巻号一覧
前身誌
48 巻, 1 号
選択された号の論文の4件中1～4を表示しています
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赤司 雅俊, 大谷 司, 下坂 厚子, 白川 善幸, 日高 重助2011 年 48 巻 1 号 p. 4-11
発行日: 2011/01/10
公開日: 2011/01/25
ジャーナル フリーFilling characteristics of granular particles into a small die cavity were investigated by experiment using model die filling system and 3D distinct element method (DEM) simulation. The influences of particle properties including flowability and speed of die shoe on filling fraction of granules, which is the ratio of the volume of filling particle to the volume of die cavity, were investigated experimentally, and it is shown that the filling fraction depends on the flow behavior of granular particles and geometry of die cavity. Three dimensional, large scale DEM simulation has been constructed to obtain detailed insights into complicated filling phenomena and apply to design of filling process. The determination method of simulation parameters in DEM model was discussed to get quantitative design parameters of filling operation by the simulation. Simulation results agreed well with experimental ones and DEM simulation can give detailed information of filling behavior of granular particles into small die cavity. Particle size-induced segregation generated in a moving shoe leads to non-uniformity of particle packing structure in the die cavity. There is optimum filling condition to minimize the segregation during die filling.抄録全体を表示PDF形式でダウンロード (1504K) -
山田 尚美, 竹内 洋文2011 年 48 巻 1 号 p. 12-18
発行日: 2011/01/10
公開日: 2011/01/25
ジャーナル フリーThe compacting properties of powdered herbal plant, Pellodendron Bark (Obaku) to prepare themore convenient dosage form, tablet, than the usual commercial product. The tablet hardness was highly dependent on the particle size of the powdered harbal plant. Formulating some disintegrant such as calcium carboxymethyl cellulose effectively improved the disintegration property of resultant tablet. However, the tablet hardness was decreased by formulating the disintegrant powder. Adding a small amount of fine silica particles in the formulation increased the tablet hardness. The spray-dried extract powder and crude plant powder of Pellodendron Bark showed the different tendency in designing the optimum tablet formulation in the point of hardness and disintegration property. By measuring the compacting properties of the powder formulations, it was suggested that change in plastic property of the powder bed was not the main reason to improve the compacting property of the formulation.抄録全体を表示PDF形式でダウンロード (794K)
解説
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高橋 順一, 執行 達弘2011 年 48 巻 1 号 p. 19-27
発行日: 2011/01/10
公開日: 2016/02/02
ジャーナル 認証ありReaction controlled sintering （RCS） was applied to the formation of multicomponent compounds in the Aurivillius family, BaBi2Nb2O9 （BBN） and BaBi4Ti4O15 （BBIT）, to produce densified bulk samples at a lower temperature. In the RSC process, binary compound powders of BaNb2O6 and Bi4Ti3O12 preformed by 1st-step calcination were mixed with powders containing the third component, Bi2O3 and BaTiO3, for the production of BBN and BBIT, respectively. They were formed into powder compacts and heated to a fixed temperature during which both reaction and densification proceed. Changes in the extent of reaction and fractional shrinkage with heating temperature were evaluated in each system. It is essential to elucidate the reaction route by which the required solid phase could be obtained at lower temperature and then to optimize a processing factor correlated to the reaction and densification activities of the materials involved.抄録全体を表示PDF形式でダウンロード (1385K)
解説 フロンティア研究シリーズ
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中川 敬三2011 年 48 巻 1 号 p. 28-33
発行日: 2011/01/10
公開日: 2016/02/02
ジャーナル 認証ありThe coverage of metal particles with silica layers is an effective method to functionalize the surface of metal particles. One of the advantages of the coverage of silica layers is to enhance the stability of metal particles. Silica-coated metal nanoparticles can be applied to various catalytic reactions through the fine structure of silica layers. The development of functionalized silica layers which cover the metal particles would lead to an increase in their application for catalytic reactions. This report will describe the preparation process of silica-coated metal particles using several organosilanes and application to the catalytic reaction involving larger reactant molecules. Pt particles covered with functionalized silica layers have sintering resistance to thermal treatment and show superior catalytic activity for dehydrogenation of organic hydride.抄録全体を表示PDF形式でダウンロード (789K)
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