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  • 川上 和寿, 河崎 実, 木内 弘道, 井口 学
    資源と素材
    1999年 115 巻 7 号 543-546
    発行日: 1999/06/25
    公開日: 1999/10/01
    ジャーナル フリー
    An aqueous H3RhCl6 solution was treated by N2H4 reduction for the purpose of producing fine Rh powder. The reaction behaviors were investigated at temperatures below 80 under the blowing of N2 to agitate the sample solution. The Rh compound precipitated from the addition of an NaOH solution to alkalize the H3RhCl6 solution. This compound showed some sharp X-ray diffraction lines, but they could not be identified. The precipitation ratio was measured by ICP analysis for Rh concentration of the filtrate. The ratio for precipitation time of 15 minutes was considered to be the equilibrium value because the ratio did not change after 15 minutes. It was clarified from the relation between the equilibrium ratio and the concentration of added NaOH solution that all of the Rh in the solution was precipitated in the case of a concentration above 0.5 mol/l. The values of the precipitation ratio were hardly affected by precipitation temperatures between 20 and 80°C. After the treatment completed precipitation of Rh in the solution, an N2H4 solution was added to the solution and reduced the compound to metal Rh. It was shown by SEM observation and measurement of the particle size distribution of the filtrated solid that distinction between the Rh compound and metal Rh was very difficult in terms of shape and size. The particles had the diameter of 0.05 ∼ 0.1μm and partly aggregated. The reduction ratio was measured from the analysis of the Rh compound in a filtrated solid because the compound was easy to dissolve in acid. However, metal Rh was difficult to dissolve by such an aqua regia. The reduction curves were obtained from reduction behavior with the reduction time in the temperature range of 60 ∼ 80°C. The initial reaction rate was obtained from the initial straight line of the reaction curve. The temperature dependency of the rate gave 96 kJ/mol as the activation energy of the reduction. Consequently, it was considered that the reduction was rate-determined by the chemical reaction.
  • -縮尺指導の授業構成と学習内容の検討を通して-
    小谷 恵津子
    新地理
    2017年 65 巻 2 号 1-18
    発行日: 2017年
    公開日: 2019/06/04
    ジャーナル フリー
    How to nurture the ability of students to read and make use of maps has long been a challenge faced by Japan’s elementary and middle schools. To this end, it is necessary to stop thinking of map study as a “nurturing of skills” and deliberately include in map study lessons on “spatial axes” and “recognition of scale,” which are the methodological concepts that form the framework for reading maps. This study considers lesson plans and learning content for improving lessons on the concept of scale by focusing on the recognition of scale and develops a model for such lessons. Scale recognition is a methodological concept that encompasses both cartographic and methodological scales. Reading a map refers to perceiving a space based on the information indicated on the map. Therefore, the creation of map-reading lessons that instill the methodological concept in students requires one to think from the perspective of the formation of human perception. From the findings of cognition science, it is clear that human perception comes into being through the medium of the body. In mapreading lessons, by making the body work as a medium in the broadest sense and making use of not only direct experience but also simulated or virtual experience, experiences from one’s life , and indirect experience, the methodological concept of scale can be more effectively explained. Further, in perceiving spaces through maps, a view from the above is indispensable. Particularly, for students to recognize the scale of a map, it is necessary to move the perspective up and down along the vertical spatial axis. Therefore, in lessons on the concept of scale, both the location of one’s viewpoint and its movement are important factors. When teaching about scale, it is necessary to arrange the lessons so that they logically flow from “generalization” to “scale” to “measurement of distance,” and through the process of moving the students’viewpoint, they will become aware of the differences between and commonalities of the representations on maps. By doing this, along with instilling in the minds of children the two concepts of cartographic scale and methodological scale, which are the elements that comprise the recognition of scale, children can discover and understand the concept of scale by themselves. Further, by using multiple maps of differing scales in lessons and comparing the scale bars, it will be easy for children to understand the concept of scale even if they have not yet learned about similarities and ratios in mathematics.
  • 鳥羽 耕史
    日本文学
    2010年 59 巻 11 号 14-26
    発行日: 2010/11/10
    公開日: 2017/08/01
    ジャーナル フリー
    一九六〇年代の小松左京は、SFやルポルタージュや評論によって、「日本」を探究したが、その結論は意外にも古き良き故郷であり、開発を望むものではなかった。『日本沈没』も田中角栄『日本列島改造論』への批判として書かれ、沈没する日本は古代に遡行したものとなっていた。この小説は現在に至るまでマンガ、ラジオドラマ、映画、テレビドラマなど、様々なメディア向けに脚色され続けているが、その流れを追っていくと、サブカルチャーを介した日本回帰という「J回帰」の特徴が出ていることがわかる。
  • 大日本窯業協會雑誌
    1921年 29 巻 341 号 171-179_2
    発行日: 1921/01/10
    公開日: 2010/04/30
    ジャーナル フリー
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