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第26回宇宙利用シンポジウム(2010年1月25日-26日, 宇宙航空研究開発機構宇宙科学研究本部相模原キャンパス), The Twenty-sixth Space Utilization Symposium (January 25-26, 2010: ISAS/JAXA Sagamihara, Japan), This working group has been established to get fruitful results using an electrostatic levitation furnace (ELF) in the International Space Station. The targets of our group are: (1) expand research area which utilizes ESL, (2) improve techniques of levitation and diagnostics, and (3) identify the necessity of microgravity. Activities of this fiscal year are briefly described in this report., 形態: カラー図版あり, 共催: 日本学術会議, 著者人数: 15人, Physical characteristics: Original contains color illustrations, joint hosting: The Science Council of Japan, 資料番号: AA0064730037

第26回宇宙利用シンポジウム(2010年1月25日-26日, 宇宙航空研究開発機構宇宙科学研究本部相模原キャンパス), The Twenty-sixth Space Utilization Symposium (January 25-26, 2010: ISAS/JAXA Sagamihara, Japan), Microgravity conditions have advantages of measurement of surface tension and viscosity of metallic liquids by the oscillating drop method with an electromagnetic levitation (EML) device. Recently, it has been identified that dependence of surface tension on oxygen partial pressure (Psub o2) must be considered for industrial application of surface tension values. Effect of Po2 on surface tension would apparently change viscosity. Therefore, surface tension and viscosity must be measured simultaneously in the same atmospheric conditions. Moreover, effect of the electromagnetic force (EMF) on the surface oscillations must be clarified to obtain the ideal surface oscillation because the EMF works as the external damping force to the oscillating liquid droplets, so extensive EMF makes apparently the viscosity values large. In our working group (WG), using the parabolic flight levitation experimental facilities (PFLEX) the effects of Po2 and external EMF on surface oscillation of levitated liquid droplets are systematically investigated for the precise measurements of surface tension and viscosity of high temperature liquids. In this year we performed the observation of surface oscillations of levitated liquid Si-Cu alloys using PFLEX on board flight experiments by G-II operated by DAS. These observations were performed under the controlled Po2 conditions. In these experiments, we obtained the density, the viscosity and the surface tension values. From these measurements, we discussed surface segregation in systems forming intermetallic compounds. We found the effect of clusters in both density and surface tension experimental data. The composition dependence of surface tension was expressed by a modified ideal solution model. On the basis of activity of our working group and European WG, we proposed the research of thermophysical properties measurement of high-temperature liquids under microgravity conditions to ESA/JAXA-AO as ISS utilization program., 形態: カラー図版あり, 共催: 日本学術会議, 著者人数: 18人, Physical characteristics: Original contains color illustrations, joint hosting: The Science Council of Japan, 資料番号: AA0064730036

第25回宇宙利用シンポジウム(2009年1月14日-15日, 宇宙航空研究開発機構宇宙科学研究本部相模原キャンパス), The Twenty-fifth Space Utilization Symposium (January 14-15, 2009: ISAS/JAXA Sagamihara, Japan), This working group has been established to get fruitful results using an electrostatic levitation furnace (ELF) in the International Space Station. The targets of our group are: (1) expand research area which utilizes ESL, (2) improve techniques of levitation and diagnostics, and (3) identify the necessity of microgravity. Activities of this fiscal year are briefly described in this report., 著者人数: 13人, 資料番号: AA0064297084

第22回宇宙利用シンポジウム(2006年1月17日-19日, 日本学術会議6階会議室 六本木、東京), The Twenty-second Space Utilization Symposium (January 17-19, 2006: Science Council of Japan, Roppongi, Tokyo, Japan), In order to get fruitful results in an electrostatic levitation furnace (ELF) in the International Space Station, this working group has been established. The aims of the working group are: (1) expand research area which utilizes ESL, (2) improve techniques of levitation and diagnostics, and (3) identify the necessity of microgravity. Activities of this fiscal year are briefly described in this report., 形態: カラー図版あり, 共催: 日本学術会議, Physical characteristics: Original contains color illustrations, Meeting sponsors: The Science Council of Japan, The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA), 資料番号: AA0064113041

第22回宇宙利用シンポジウム(2006年1月17日-19日, 日本学術会議6階会議室 六本木、東京), The Twenty-second Space Utilization Symposium (January 17-19, 2006: Science Council of Japan, Roppongi, Tokyo, Japan), Electromagnetic levitation (EML) technique is useful method for measurement of thermophysical properties of liquid state of metals and semiconductors at high temperature. The EML technique has big advantages for easily keeping large undercooled due to containerless situations. When we measure using this technique the density of liquid metals or molten semiconductors, the volume of levitated droplet-samples must be precisely observed from their shapes. In conventional methods, volume of the droplets obtained by averaging of few hundred images taken by high-speed camera, but large error values appear in temperature dependence data due to the asymmetry of surface oscillation of electromagnetically levitated liquid droplets. In this study, we propose new method to obtain accurate density of high temperature liquid by using the analytical technique of surface oscillations. We confirmed that this technique is useful for precise measurement of high temperature melt density combined with the static magnetic field experiments., 形態: カラー図版あり, 共催: 日本学術会議, Physical characteristics: Original contains color illustrations, Meeting sponsors: The Science Council of Japan, The Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (ISAS)(JAXA), 資料番号: AA0064113048

第28回宇宙利用シンポジウム (2012年1月23-24日. 日本学術会議), 港区, 東京都, Space Utilization Research (January 23-24, 2012. Science Council of Japan), Minato-ku, Tokyo Japan, 著者人数: 16名, 資料番号: SA6000032029, レポート番号: M29