著者

古賀 三井 蔵元 英一 佃 昇

出版者

九州大学大学院総合理工学研究科

雑誌

九州大学大学院総合理工学報告 (ISSN:03881717)

巻号頁・発行日

vol.21, no.4, pp.333-336, 2000-03

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In order to investigate the time dependent material structure the time-resolved x-ray diffractometry with a position sensitive detector(PSD)has so far been used. But this method is not so effective to the precise lattice parameter measurement, because of low angular resolution of the detector. In the present study, therefore, the development of the time-resolved x-ray diffractometry by the angular scanning with a scintillation counter (SC) has been attempted. Lattice parameter measurements of highly oriented pyrolytic graphite(HOPG)during rapid heating and cooling have been examined by both methods. As a result, the angular scanning method can realize more precise measurement than that of PSD method. From this result it was clarified that SC method is more suitable than the PSD method for the precise detection of the structure change of materials.

著者

中島 秀紀 立園 恵巳子 神田 幸則

出版者

九州大学大学院総合理工学研究科

雑誌

九州大学大学院総合理工学報告 (ISSN:03881717)

巻号頁・発行日

vol.14, no.3, pp.329-336, 1992-12-01

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A recent model by Kammash and Galbraith (Nuc1. Fusion 29 (1989) 1079) for the energy gain calculation of the Magnetically Insulated Inertial Confinement Fusion (MICF) pellet has employed an incorrect expression for the equation of motion. Use of the correct expression can substantially change the prediction by the model. The input energy may require, at least, an order of magnitude increment to obtain the energy gain factor Q values in the hundreds.

著者

酒井 浩 張 裕民 有川 節夫

出版者

九州大学大学院総合理工学研究科

雑誌

九州大学大学院総合理工学報告 (ISSN:03881717)

巻号頁・発行日

vol.10, no.1, pp.59-66, 1988-06-30

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Theoretical and practical issues about an intellectual information system MIR-RF (M___ulti-stage I___nformation R___etrieval System Based upon R___esearcher F___iles), which was realized by fortran in 1975, are discussed. One natural way to acquire knowledge is theoretically reformalized based on the logic program, in this case thesauri play an important role. According to the formalization, the representation and description of knowledge (or informations) are more simplified than those of former system, and a new MIR-RF system can easily be realized by Prolog.

著者

波多野 雄治 磯部 兼嗣 下瀬 健 杉崎 昌和

出版者

九州大学大学院総合理工学研究科

雑誌

九州大学大学院総合理工学報告 (ISSN:03881717)

巻号頁・発行日

vol.16, no.4, pp.369-373, 1995-03-01

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Zircaloy-2 specimens were oxidized in steam and charged with tritium by the cathodic charging method. The distribution of tritium in the oxide film and alloy was observed by microautoradiography. Although tritium was absorbed by the alloy through the oxide film, the tritium concentration in the oxide film and alloy layer beneath it was lower than the concentration in the inner region of alloy. In the oxide film and alloy layer beneath it, tritum segregated in intermetallic precipitates. In the inner region of alloy, tritium segregated in the intermetallic precipitates and the grain boundary of zirconium matrix.

著者

井上 裕策 岩井原 瑞穂

出版者

九州大学

雑誌

九州大学大学院総合理工学研究科報告 (ISSN:03881717)

巻号頁・発行日

vol.17, no.3, pp.381-388, 1995

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This paper proposes a method of representing relations implicitly using binary decision diagrams (BDD), which are data structures to represent logic functions compactly, and are widely used in computer-aided design (CAD)area We consider utilization of BDD for query processing in deductive databases. In this paper, we show two methods, called linear encoding and logarithmic encoding, to represent relations implicitly using BDDs. We compared the performances of these encodings with the traditional evaluation based on hash joins, and the proposed methods are faster than the hash-join-based methods over transitive closure queries on linear graphs and dense random graphs.

著者

益田 光治 佐藤 義智 岩本 勝治 樫村 秀男 森 和彦

出版者

九州大学大学院総合理工学研究科

雑誌

九州大学大学院総合理工学報告 (ISSN:03881717)

巻号頁・発行日

vol.15, no.3, pp.291-297, 1993-12-01

被引用文献数

2

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Supersonic freejets have been studied as a fundamental phenomenon of the supersonic fluid mechanics, and numerous works have been done experimentally as well as theoretically. Although the central isentropic region bounded by the barrel shock wave and the Mach disk has been clarified, it is still not possible to evaluate the detailed structures of the freejets. Present paper aims to offer fundamental information of the supersonic freejets, with an emphasis to give data with which the shape of the freejets can be depicted under a specified condition. The TVD finite-difference scheme is adopted for the numerical calculation of the Euler's equations. The distributions of the flow properties are obtained for the three-dimensional axisymmetric and the two-dimensional freejets. The data are summarized to enable an estimation of the shape of the freelets.

著者

上広 勝信 饒 燕飛 福田 研二

出版者

九州大学

雑誌

九州大学大学院総合理工学研究科報告 (ISSN:03881717)

巻号頁・発行日

vol.17, no.2, pp.245-252, 1995

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An analytical model is proposed to study regional instabilities in parallel boiling channels with the voidreactivity feedback. The model takes into consideration the effect of interaction between channels with different void fraction change by modeling the diffusion of neutrons. Linear stability analysis in the frequency domain is performed to investigate dominant factors of unstable oscillation mode. In the case of 2 channels, two stability boundaries are found to exist on the stability map, one for the in-phase and the other for the out-of-phase mode instabilities respectively. It is found that the interaction between channels affects the out-of-phase mode instability. For a certain range of the void-reactivity coefficient, the void-reactivity feedback loop is found to be unstable in a certain region on the stability map, which has an effect on the stability of the in-phase mode stability.

著者

中川 清 福田 研二 藤本 登

出版者

九州大学

雑誌

九州大学大学院総合理工学研究科報告 (ISSN:03881717)

巻号頁・発行日

vol.19, no.3, pp.309-315, 1997

被引用文献数

1

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This study has been carried out to probe into the availability of using solar power generation as a substitutive power system for the fossil fuel in Japan. The available space the solar cell array could be installed is 10% for the plottage of major buildings, 0.5~2% for the flat land and a certain percentage for the appended facilities for road, etc. The generation capacity of the solar cell is assumed to be 100 W/m2 at peak time (the average value is 1/10).The generating power calculated from the conditions above is about 250GWp and nearly 75% of that is from the building plottage, and the available space for array installation is close to 0.66% of the gross land area. Also, based on the above estimate, the generating power is expected 286 billion kWh a year, which is about 30% of the total power generated (964 billion kWh in 1994), that is about 5% of the total power consumed (5.9trillion kWh in l994).

出版者

九州大学

雑誌

九州大学大学院総合理工学研究科報告 (ISSN:03881717)

巻号頁・発行日

vol.19, no.2, pp.227-294, 1997