DSpace コレクション: 2008-102008-10http://hdl.handle.net/11133/562024-03-29T12:05:46Z2024-03-29T12:05:46Zマイクロマシンの浮揚に関する基礎的研究鳥井, 昭宏坂野, 正昭植田, 明照http://hdl.handle.net/11133/16872013-11-05T07:12:00Z2008-10-06T15:00:00Zタイトル: マイクロマシンの浮揚に関する基礎的研究
著者: 鳥井, 昭宏; 坂野, 正昭; 植田, 明照
抄録: We describe the structure of a micromachine, and preliminary experimental results. The micromachine, which consists of a piezoelectric element and two masses, can jump or levitate on a flat surface. The micromachine jumps by the rectangular voltage applied to the piezo, and levitates by the sinusoidal voltage. The height of the jump and the levitation is discussed by the use of some different experimental conditions. The height of the jump of the micromachine is about 10 μm by using a rectangular voltage. The micromachine levitates in about 10 μm by the use of a sinusoidal waveform. The jump and levitation of the micromachine are measured with a displacement sensor, an optical microscope, and an electrical circuit.2008-10-06T15:00:00ZCVI法により作製したリチウムイオン電池用熱分解炭素負極大澤, 善美中島, 剛http://hdl.handle.net/11133/16882020-08-21T01:05:05Z2008-10-06T15:00:00Zタイトル: CVI法により作製したリチウムイオン電池用熱分解炭素負極
著者: 大澤, 善美; 中島, 剛
抄録: Using pressure-pulsed chemical vapor infiltration (PCVI) method, novel preparation process of negative electrode for the lithium-ion rechargeable battery was investigated. This process consisted of two steps of the partial infiltration of TiN into highly porous carbon performs, and the infiltration of pyrolytic carbon as the active material. TiN was partially infiltrated into the highly porous carbon preforms at 850℃ from gas system of TiCl_4(1%)-N_2(20%)-H_2. The porous carbon preforms were prepared by the carbonization of commercial filter paper and wood at 1000℃ in Ar for 4 h. After 10000 pulses of PCVI, electro-conductive porous bodies were obtained, which had the porosity of 80% and more, the resistivity of 0.1 mΩ cm, and the average pore sizes of 10-40 μm. The geometric surface area per unite volume showed highest value with the sample obtained from carbonized wood preform. When the TiN/wood porous bodies were used as current collector, therefore, it was expected that contacting resistance between active materials and current collector became the lowest value. The plate-type negative electrodes were prepared by PCVI of pyrolytic carbon into the TiN-based porous bodies at 950℃ from C_3H_8 (30%)-H_2. Three-dimensional current paths were formed in the active material layers of the negative electrodes obtained by present process. The electrode showed the excellent rate performance, and capacity of pyrolytic carbon maintained 90% of initial value after the charge-discharge cycling of 50 times.2008-10-06T15:00:00Z蒸気圧縮式冷凍機と低温潜熱蓄熱器を組み合わせた冷熱の高効率生成渡辺, 藤雄日高, 秀人窪田, 光宏http://hdl.handle.net/11133/16892013-12-13T02:34:27Z2008-10-06T15:00:00Zタイトル: 蒸気圧縮式冷凍機と低温潜熱蓄熱器を組み合わせた冷熱の高効率生成
著者: 渡辺, 藤雄; 日高, 秀人; 窪田, 光宏
抄録: To level the electric load and increase the efficiency of cold heat production, a new cold heat storage-heat utilization air conditioning system incorporating PCM(phase-change material with a melting temperature of 13℃) in conventional VCRM(vapor compression refrigerating machine) was proposed. In this system, the cold heat is stored in PCM13 during the VCRM operation in the night-time. Subsequently, the cold heat stored in PCM13 is rleased for use as a coolant in the VCPM condenser in the case of high COP(coefficient of performance) during daytime. Energy savings of the proposed system were compared with the conventional cold heat production system with ice in terms of the cooling load of a standard office and a residence in summer in Tokyo. This comparison was based on estimation of COP of VCRM from p-h diagram of hydrofluorocarbon refrigerant, R134a. As a result, the energy saving of the proposed system, compared with the ice thermal storage in terms of power input of cold heat of 5℃, was 13% and 11% for a standard office and a residence, respectively. The higher energy saving obtained for a standard office was attributed to the fact that the cooling load is distributed over day-time in the office, while in the residence, it is highest at night-time. Finally, when ice was replaced with PCM13 in a conventional ice thermal storage, the energy consumption was reduced by 47% and 49% for a standard office and a residence, respectively. However, the temperature of cold heat supplied was 18℃ which was too high to dehumidify the air in the air-conditioning process.2008-10-06T15:00:00Zべンゾ[b]フラン-2,3-ジオン類と2,3-ジメチル-2-ブテンとの光化学反応立木, 次郎伊藤, 貴賢http://hdl.handle.net/11133/16822013-11-05T07:05:25Z2008-10-06T15:00:00Zタイトル: べンゾ[b]フラン-2,3-ジオン類と2,3-ジメチル-2-ブテンとの光化学反応
著者: 立木, 次郎; 伊藤, 貴賢
抄録: Photochemical reactions of benzo[b]furan-2, 3-diones with 2, 3-dimethylbut-2-ene in degassed solutions were investigated. Photoreaction of benzo[b]furan-2, 3-diones with 2, 3-dimethylbut-2-ene in degassed nonpolar solvents selectively gave dioxene derivatives, [4+2]photocycloadduct in excellent yields. One the other hand, photoreaction of benzo[b]furan-2, 3-diones with 2, 3-dimethylbut-2-ene in degassed polar solvents underwent not only [4+2]photocycloaddition but also [2+2]photocycloaddition of substrates to give dioxene derivatives and oxetan derivatives in moderate yields. In addition, oxetan derivatives underwent photolysis to give isopropylidene derivatives.2008-10-06T15:00:00Z