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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
No full textWigner 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.application/pdfdepartmental bulletin pape
SiC‐CFRP‐制振金属積層複合材料の作製と機械的特性評価
No full textThis study reports the manufacturing process and the mechanical properties for laminated composites consisting of 3 or 5 layers with ceramic, CFRP (carbon fiber reinforced plastic) and damping-metal plates. To compensate the brittleness in ceramics, CFRP and damping-metals were laminated on ceramic plate by both autoclave and hand-painting methods.It was found that the specific 3 point flexural strength and the specific Charpy impact absorption energy increased to reach 0.145MPa/(kg/m³) in case of 3 layers and 25.0(J/m²)/(kg/m³) in case of 5 layers by both autoclave methods, which were 1.58 and 27.6 times higher than those of monolithic SiC, respectively. Laminated omposites have a high strength and impact strength.application/pdfdepartmental bulletin pape
クロスセクター効果に基づく地域公共交通システム評価手法の検討～飯山市を対象として～
No full textIn local cities, public transportation systems are not profitable, so local governments make up the deficit. To evaluate the value of public transportation systems, it is ecessary to use not only quantitative indicators such as the number of users and revenues, but also non -quantifiable indicators such as residents' satisfaction and social benefits. Therefore, this study compares the current expenditures with the amount of increase in social burdens by sector that would be required by eliminating the public transportation system. Furthermore, we aim to establish a new public transportation ystem evaluation method by calculating the cross-sector effects of a regional public transportation system for Iiyama City, Nagano Prefecture.application/pdfdepartmental bulletin pape
Ti粉末加圧焼結時の超音波付与による高密度化
No full textThe 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.application/pdfdepartmental bulletin pape
光触媒を利用したCFRPリサイクルに関する研究
No full textAn 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.application/pdfdepartmental bulletin pape
自然災害が救急駆け付け搬送の救命可能率に及ぼす影響‐長野市居住誘導区域の設定を対象とした検証‐
No full textIn this paper, Impact of disasters on emergency care service framework is developed to study network traffic volume assignment. We examine the life-saving constraints considering the location of fire stations and first-aid station. We propose the life-saving potential indicator of the travel time to the urgent medical in-stitution of an mbulance. In this paper, the above method is applied to residence attraction area of Nagano Urban City. In the experimental study, we verified location of fire stations and first-aid station affects a limit time to life-saving. We confirmed residence attraction area responsible of emergency car based on life-saving potential.application/pdfdepartmental bulletin pape