Consideration about a Japanese male-students tennis player\u27s strengthening measure- The strengthening activities of the 26th Universiade game conventions, and future subject -

日本男子学生テニス選手の強化策について,第26回ユニバーシアード競技大会の強化活動及び,本大会における結果から考察する。次回大会においての男子チームの目標は,1)シングルス入賞/ダブルス,団体メダル獲得/MIX ダブルス銀メダル,2)競技者として社会人としての人間形成の2点である。その為には,今後も継続的な強化活動の中で,1)についてはATP ランキングの更なる向上,2)についてはスポーツマンシップ教育であると考える。The way to make a hard-hitting measure of tennis players who are Japanese male students from an enhanced activity of the 26th Universiade game cup and the result of this cup are discussed. There are two goals for the next cup. The first goal is to win the single prize, to get medals for doubles and groups and to get a silver medal for mix doubles. The second one is to build a character as an athlete and a member of society. It is necessary for the first goal to improve ATP ranking more while continuing an enhanced activity. And alsofor the second goal, it is necessary to do a sportsman education

Difficult Cutting Property of NiTi Alloy and Its Mechanism

This paper describes the difficult machinability of nickel titanium alloy (NiTi alloy) and its mechanism. As a result of examining the difficult cutting machinability via a turning experiment, NiTi alloy cutting showed larger cutting force, higher cutting temperature, and severe tool wear with plastic deformation of the tool compared to Ti-6Al-4V. In addition, the discharged chips were tangled with the jaw chuck and the cutting tool. As a result of investigating the cause of these difficult machining properties by orthogonal cutting, it was found that the progression of severe flank wear is affected by the elastic recovery due to the super elasticity of the material. The verification of the results according to the shear plane theory suggest that the large deformation resistance of the material is the cause of the increase in cutting temperature. Furthermore, because the cutting temperature exceeds the shape memory transformation temperature, the generated chips are shape memory processed. It was also found that because the generated chips are super elastic, chips are not easily broken and they are lengthened, and are easily entangled with a cutting tool and a jaw chuck