ピンボール 木の豆ミックス2

Journal of the Hydrogen Energy Systems Society of Japan
Online ISSN : 2436-5599
Print ISSN : 1341-6995
Volume 27, Issue 1
Displaying 1-13 of 13 articles from this issue
  • Souichiro Mizusaki, I. Yamamoto, M. Yamaguchi, N. Hiraoka, M. Itou, Y. ...
    2002 Volume 27 Issue 1 Pages 5-10
    Published: 2002
    Released on J-STAGE: July 21, 2022
    DOI
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS

    The Compton profiles for PdHx and its host metal Pd have been determined from Compton Scattering of 115keV by synchrotron radiation. The momentum resolution of 0.14~0.17a.u is much higher than previous experiments. The difference profiles between PdHx and Pd are compared with theoretical Compton profiles from the electronic structure by LDA-FLAPW calculation.

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  • Makoto SAKURAI, Kozue MORIYAMA, Hideo KAMEYAMA
    2002 Volume 27 Issue 1 Pages 11-16
    Published: 2002
    Released on J-STAGE: July 21, 2022
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    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS

    Thermochemical hydrogen production process named UT-3 cycle consists of four gas-solid reactions. In this process, these four reactions are conducted cyclically under the condition of closed loop of gas flow. A dynamic simulation model of the UT-3 process was built and the simulation study using this model was conducted to find out the optimum balanced operating condition of the process. The effects of reaction rate and reaction temperature on the progress of each reaction and cyclic reaction were investigated

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  • Seijiro Ihara, Syu Saito
    2002 Volume 27 Issue 1 Pages 17-22
    Published: 2002
    Released on J-STAGE: July 21, 2022
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    Photovoltaic cell and fuel cell are now taking their place as main energy technology in the 21st century, and have led the idea of solar hydrogen energy system to practicality. Work on the engineering design and operation of photovoltaic hydrogen stand-alone system (PVHS) has a specific problem caused by unpredictable nature in insolation and electric power demand. To ensure rational cost and robust operation, each component of PVHS has to be minimized as possible, and optimally operated with the control so as to supply the total electric power matching to the demand. The paper first outlines an optimization approach to determine the power capacity of each component of PVHS using linear programming. It then proposes a concept of system operation with the learning control implemented by neurocomputing algorithm. The performance of this control program is tested with computer simulation on a conceptual model of PVHS for residential use.

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  • Tsugihiko TAKUMI, Yukihiko MATSUMURA
    2002 Volume 27 Issue 1 Pages 23-28
    Published: 2002
    Released on J-STAGE: July 21, 2022
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    A process calculation based on chemical thermodynamics and mass and heat balances is conducted for a new process of supercritical water biomass gasification, where the effluent containing unreacted organic compounds is processed with supercritical water oxidation, and the heat of oxidation is utilized to heat biomass feedstock. Partial oxidation is also applied so that rapid heating of the feedstock is attained. Although incomplete gasification and partial oxidation results in reduction of the available heat of biomass, by utilization of heat of oxidation, large temperature difference that enables effective heat recovery is attained. This large temperature difference is expected to realize higher heat exchanger efficiency. Process simulation was conducted for the proposed process, and energy efficiency was calculated. Energy efficiency of 69% is obtained on on primary energy basis. When electricity consumption at activated sludge process is included, an efficiency of 48% is obtained.

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  • Takuji IIDA, Hajime MAKI, Shigenori MITSUSHIMA, Nobuyuki KAMIYA, Ken-i ...
    2002 Volume 27 Issue 1 Pages 29-34
    Published: 2002
    Released on J-STAGE: July 21, 2022
    DOI
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    The conductivity of a polymer electrolyte membrane is one of the most important factors, which govern the performance of polymer electrolyte fuel cell. In this study, we proposed a new measuring method of conductivity by direct current with perpendicular direction to the surface of membrane, which imitated the operation conditions of an actual cell. The

    conductivity of Nafion®117 by using the new method was 0.085 S cm-1, which was in good agreement with official announcement value of 0.083 S cm-1. This shows that the new method proposed in the present paper is valid. Using the new method, it was found that the conductivity increased with increasing the ion exchange capacity, and the activation energy of proton conduction was obtained as about 10~15 kJ mol-1.

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  • Yuko Maruyama, Yasukazu Saito
    2002 Volume 27 Issue 1 Pages 35-40
    Published: 2002
    Released on J-STAGE: July 21, 2022
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    The catalyst-assisted chemical heat pump (CHP) system for temperature upgrading, constituted with reversible ndothermic methylcyclohexane and exothermic toluene hydrogenation reactions together with the functions of separation and heat storage, was presented. Accoding to Aspen Plus process simulation, the system thermal efficiencies from 200℃ to 250℃ and 300℃, were estimated as 72.3% and 68.2% respectivery. Exergy analysis on this CHP system was performed in terms of exergy loss due to heat dissipation and of exergy gain from evaluated to be null in exergy.

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  • Shigenori MITSUSHIMA
    2002 Volume 27 Issue 1 Pages 41-47
    Published: 2002
    Released on J-STAGE: July 21, 2022
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    Polymer electrolyte fuel cells (PEFCs) have been developed as power sources of electric vehicle and home co-generation system. In order to develop PEFC system, the development and the research of materials i.e. electrode catalyst, electrolyte membrane, and catalyst of fuel processing have been important. The electrode catalysts are required higher activity for oxygen reduction reaction and hydrogen oxidation reaction under CO containing fuel. The electrolyte membranes are required to maintain their ionic conductivity under dry atmosphere. CO selective oxidation catalyst, which is one of fuel processing catalysts, are required their selectivity and activity of CO oxidation. The new material must be evaluated as their own characteristics and the fuel cell assembly. For the estimation of the fuel cell assembly, the cell voltage as a function of the current must be measured. The cell voltage is important factor, because it indicates the efficiency of the energy conversion. The cell performance is affected the composition of fuel and oxidant gas, flow rate of fuel and oxidant gas, operating pressure, and cell temperature. Especially, humidity of gases, which is one of gas composition parameter, greatly affect to the cell performance because of the property of the electrolyte membrane. In the cell performance measurement, these parameters must be controlled accurately.

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  • Isao ABE
    2002 Volume 27 Issue 1 Pages 48-50
    Published: 2002
    Released on J-STAGE: July 21, 2022
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    Physical and Chemical properties of hydrogen is described with data. Among the properties, only those related to the use of hydrogen for energy medium.

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  • [in Japanese]
    2002 Volume 27 Issue 1 Pages 51-60
    Published: 2002
    Released on J-STAGE: July 21, 2022
    DOI
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  • [in Japanese]
    2002 Volume 27 Issue 1 Pages 61-70
    Published: 2002
    Released on J-STAGE: July 21, 2022
    DOI
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  • [in Japanese]
    2002 Volume 27 Issue 1 Pages 71-79
    Published: 2002
    Released on J-STAGE: July 21, 2022
    DOI
    RESEARCH REPORT / TECHNICAL REPORT FREE ACCESS
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  • George P. Hansen
    2002 Volume 27 Issue 1 Pages 80-86
    Published: 2002
    Released on J-STAGE: July 21, 2022
    DOI
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