Repository of NNCT (Nagano National College of Technology)
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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～
Get PDFapplication/pdfIn 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.departmental bulletin pape
居住人口分布に対する用途近接性を考慮した生活利便施設へのアクセス性の検証-長野市立地適正化計画を対象として-
Get PDFapplication/pdfIn recent years, the urban area has been extensively developed in many regional cities, and the population density has declined. There is a concern that the decline of the region will progress since they can’t maintain living and economic activities. In this study, we focused on residence attraction area of Nagano city. To verify the accessibility to living convenience facilities for resident population distribution, we examined relationship between the accessibility to the urban function facility, distribution of residential areas in the city and activity level for each age group. We classified all subjects into three age groups and compared the results of each. In this study, based on a case of Nagano city, construct a trip linear regression model ncluding composition factor of population density and usage accessibility with facility locations, travel time.departmental 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
Get PDFapplication/pdfThis 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.departmental bulletin pape
オートクレーブ法によるAl₂O₃‐CFRP‐金属積層複合材料の作製と機械的特性評価
Get PDFapplication/pdfIn order to improve toughness of Al₂O₃ ceramic, CFRP and metal were laminated on Al₂O₃ ceramic plate by the autoclave technique. The metal used in this study included Al, Ti, D2052 (damping alloy: Mn-Cu-Ni-Fe) and SUS304 plates, and perforated SUS304 plates with various hole diameters. The laminated composites were characterized by bulk density measurement, 3-point flexural and Charpy impact tests. As a result of flexural and impact tests, the specific flexural strength of Ti-CFRP-Al₂O₃-CFRP-Ti and the specific Charpy impact strength of Al-CFRP-Al₂O₃-CFRP-Al reached 0.133 MPa/(kg/m³) and 26.3(J/m²) /(kg/m³), which were 1.40 and 22.1 times higher than those of monolithic Al₂O₃, respectively.departmental bulletin pape
ホットプレス法によるSiC/VGCF短繊維強化複合セラミックス焼結体の作製と特性 ‐VGCF均一分散溶液の選定と複合体特性評価‐
Get PDFapplication/pdfA composite was hot-pressed by adding 3.23 mass% of short fiber VGCF (vapor phase carbon nano-fiber) having a diameter of about 0.15 μm to SiC ceramics. VGCF was present at the grain boundaries of SiC while maintaining the fiber shape in the composite. By dispersing VGCF with SiC using an aqueous agar solution, the mechanical and electrical characteristics could be improved. Compared with the case where VGCF was not added, the bending strength, the fracture toughness and the lectrical conductivity were improved by about 1.92 times, 1.46 times and 400 times, respectively.departmental bulletin pape
超音波加振型加圧焼結法によるNi粉末の焼結促進と高強度化
Get PDFapplication/pdfIn this research, focusing on the vibrational energy (acoustic energy) of ultrasonic waves that can be generated with a relatively simple device, hot-press sintering of Ni metal powder under assisting this energy is examined to improve sintering promotion and the strength by an experiment. A pure Ni metal powder is packed in a cylindrical mold, then, heated to a hot-press temperature in inert Ar gas. The hot pressing at 40 MPa under ultrasonic vibration (using ultrasonic transducer with inherent frequency of 20 kHz and 28 kHz) was applied to the metal powder for a predetermined sintering time. The relative density, tensile strength and electrical conductivity of the sintered compact were investigated. As a result, it is able to promote sintering and increase the strength by the aid of the ultrasonic waves.departmental bulletin pape