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An Investigation and interpretation of 'Oeno Chisato-shu'（大江千里集）(12)
Get PDFThis paper is an investigation and interpretation (釈論) of 'Oe no Chisato-shu' (大江千里集) which is an anthology of Waka (和歌＝ancient Japanese poems) by Oe himself. In this anthology, as usually called Kudai-waka (句題和歌), each Waka is given one phrase poetic title from Kanshi (漢詩＝ancient Chinese poem) selected by Oe. The authors of this paper think that the mutual relations between expressions in both Waka and Kanshi have various patterns. So，the central purpose of our investigation is to concretely explicate the actual condition of all these patterns． And first,this paper treats of Waka No.46～No.49 of'Oe no Chisato-shu'.departmental bulletin pape
純B₄Cセラミックスホットプレス焼結体の機械的・電気的特性‐ホットプレス圧と雰囲気圧の影響‐
Get PDFapplication/pdfIn order to understand the characteristics of B₄C monopoly, the effects of hot-press (HP) pressure and Ar inert atmospheric pressure on the mechanical / electrical properties of pure B4C powder compact were investigated using the HP method. The sintering temperature was constant at 1950 ° C, and the sintering time was 3.6 ks. When the press pressure was increased, the densification occurred rapidly and the relative density reached 99.3% even at a low HP pressure of about 23.4 MPa. Furthermore, when the press pressure was 31.2 MPa, a relative density of 99.9%, a flexural strength of 502 MPa, and a hardness of 38.5 GPa were obtained. By using the HP method, B4C is able to obtain high properties and a smooth surface (mirror surface) by the HP sintering without adding a sintering aid.departmental bulletin pape
光触媒を利用したCFRPリサイクルに関する研究
Get PDFapplication/pdfAn experiment was conducted to recover carbon fiber from CFRP by recycling. CFRP small sheet pieces and spherical media were placed in a cylindrical can and held at 50℃ for 0.5 hours at 12 rpm to accelerate decomposition. As the decomposition media, TiO₂, Al₂O₃, ZrO₂, Ti and none(no media), which were sintered after spherical molding, and those with anatase type TiO₂ coating were used. Recycling results were evaluated by SEM observation, elemental analysis, and line elemental analysis.
As a result, the good results were obtained in the case of rutile type iO₂(r), that is, without the coating of anatase type TiO2 and in the case of None media, both of which had a C element concentration of about 99% and an O element one of about 1%. The shape of the recovered carbon fiber did not change the figure.departmental bulletin pape
ホットプレスLaB₆セラミックスの機械的及び電気的特性
Get PDFapplication/pdfIn this study, pure LaB6 ceramic powder was hot-pressed to prepare a sintered compact when the press pressure was changed from 7.05 to 28.17 MPa, and the mechanical and electrical properties were revealed.
The relative density improved in proportion to the press pressure, and 82.9-95.3% was obtained. When the hot-press pressure is 28.17MPa, the sintered compact has a relative density of 95.3%, Vickers hardness 15.2GPa, flexural strength 216MPa, fracture toughness 2.06MPa・m1 / 2, Young's modulus 204GPa, shear modulus 84.8 GPa, surface roughness Ra 297nm and electric conductivity 7.67MS/m. It is characterized by having high electrical conductivity.departmental bulletin pape
Earthquake Damage Prediction for Obuse Town by Medium Sized Section of Fault
Get PDFapplication/pdfAlthough the national government and Nagano prefecture have estimated earthquake damage of M7 class or higher, no estimation of earthquake damage of M6 class has been made yet.
Therefore, in this study, for the purpose of enlightening the regional disaster prevention of Obuse Town, it is assumed that a medium-scale earthquake equivalent to M6.5 will occur in the Shinanogawa fault and the most dangerous fault section will be identified. In addition to the seismic intensity distribution on the ground surface, he total number of full and half-destroyed wooden and non-wooden structures in the town, the number of casualties, and the damage to road structures are predicted.departmental bulletin pape