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CrB,CrB₂,Cr₂N,CrSi₂セラミックスのホットプレス焼結とその機械的・電気的特性
Get PDFapplication/pdfIn order to investigate the mechanical and electrical properties of CrB, CrB₂, Cr₂N, and CrSi₂ of Cr-based ceramics with good oxidation resistance, hot press (HP) sintering was performed under the condition of pressure of 28.2 MPa for 3.6 ks at a temperature of 85% of the melting point [℃] in a Ar atmosphere using each pure powder. As a result, CrSi2 has good mechanical properties as a whole, with a flexural strength of 343 MPa, a fracture toughness value of 3.44 MPa∙m1/2, and a surface roughness (Ra) of 70.0 nm. On the other hand, as for the electrical characteristics, CrB₂ had a high electrical conductivity of 2.44 MS/m, and CrSi₂ had a low one of 0.072 MS/m. The oxidation temperature of these ceramics is 1000°C or higher. Therefore, Cr-based ceramics are suitable for materials in fields where oxidation resistance is required.departmental bulletin pape
釈論大江千里集（十）
Get PDFapplication/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.36～No.40 of ‘Oe no Chisato-shu’.departmental bulletin pape
呉の金陵府と南唐の西都江寧府
Get PDFapplication/pdfThis paper is a study of Jiangning Fu, the capital of Southern Tang, the predecessor of present-day Nanjing City. I thought it was rebuilt as a military base for the Navy at the end of the Tang dynasty. The change in the Yangtze River was closely related to the construction of the city. I considered the process of transitioning from the Kingdom of Wu to the Southern Tang dynasty and the problems of building this city. Finally, we positioned this city in the history of the Chinese capital.departmental bulletin pape
自動車交通シミュレーションによる駐車場選択行動ならびに交通混雑度評価手法の検討
Get PDFapplication/pdfIn Obuse Town, national route 403 is crowded on Saturdays, Sundays, and during the tourist season. According to the survey, the degree of congestion from the Murayama Obuse stop line was 1.05. The vehicle traffic is exceeding traffic capacity, especially at intersections in the center of town, with large bus operations and vehicles waiting for parking being a contributing factor. Therefore, this study uses the micro traffic
imulation software Vissim to check congestion caused by ente ring and exiting parking lots, reproduce the movement of vehicles and pedestrians, and study traffic control ethods. In addition, we will assume the influx of large buses and other vehicles, and aim to present the impact and appropriate guidance methods.departmental bulletin pape
18世紀ドイツにおけるニュートンの運動法則Ⅱの受容
Get PDFapplication/pdfIt is often said that Newton’s Law II was neglected in 18th century Germany. In fact, also Kant’s law of mechanics lacked Law II. Exactly, however, the theories of laws of motion were so various that we cannot conclude that Law II was nowhere formulated at that time. Especially, many natural philosophers who belong to Newtonian eclectics re-formulated Law II in their own ways. Their explanation of Law II was different from Newtonian mechanics today because they assumed the case where the motion is communicated by the force, which is proportional to “mv” (rather than “ma”), in the collision of two bodies. Given this, to investigate Kant’s theory of mechanics, it is inevitable to consider the textbooks by Newtonian eclectics.departmental bulletin pape
ウィグナー分布とフーリエ変換のハイブリッドスペクトル解析法による音声信号解析
Get PDFapplication/pdfWigner Distribution (WD) has recently attracted attention from many researchers as a tool for time-frequency signal analysis. WD offers higher frequency resolution but with interference terms for multiple frequency components. A method of spectral analysis as a hybrid of WD and FT is proposed for time-varying signals. The method offers higher frequency resolution with neither interference terms nor aliasing. This method is applied to measurement of a voice signal.departmental bulletin pape
Ti粉末加圧焼結時の超音波付与による高密度化
Get PDFapplication/pdfThe sintering promotion effect was investigated based on the both cases where 28kHz and 20kHz ultrasonic waves were applied and not applied during hot-press sintering of Ti powder. The promotion effect was
valuated by relative density, tensile strength, Vickers hardness, electrical conductivity, and SEM microstructure observation. As a result, when the hot-press pressure was 40MPa and the sintering time was 10 minutes in the Ar inert gas atmosphere, great promotion was obtained at 800°C. For example, the relative density could be improved from 84.4% to 95.6% (at 20 kHz), and the tensile strength could be improved from 291MPa to 592MPa (at 20kHz). However, at a lower temperature at 600 and 700°C and a higher temperature of 900°C, the improvement range became smaller.departmental bulletin pape