Journal of Advanced Science
Online ISSN : 1881-3917
Print ISSN : 0915-5651
ISSN-L : 0915-5651
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Volume 13, Issue 3
Displaying 101-108 of 108 articles from this issue
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  • The remanufacturing process as an option for product re-birth
    Luigia PETTI, Lorella MERCURI, Andrea RAGGI
    2001 Volume 13 Issue 3 Pages 498-500
    Published: March 15, 2002
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.2978/jsas.13.498
    JOURNAL FREE ACCESS
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    In several industries, remanufacturing has become an important complement to the production process. One aspect of achieving sustainable growth is increasing the amount of product recovered from the world's waste stream. An approach to this is assuring that more remanufactured products reach the marketplace. Remanufacturing firms take in used products or components, disassemble them and produce saleable products, by refurbishing the items or assembling them from the good parts they find. To be successful at remanufacturing, a firm must have reverse logistics systems, disassembly and inspection skills, and assembly capability, and develop product strategies that support a product recovery process. As the skills are honed, remanufacturing offers an opportunity for many companies to adopt environmentally conscious operations.
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  • Decomposition of dioxin by plasma assisted catalytic technology (PACT)
    Yuji HAYASHI, Isao TATEYAMA, Hiroshige MATSUMOTO
    2001 Volume 13 Issue 3 Pages 501-504
    Published: March 15, 2002
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.2978/jsas.13.501
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    Environmental issues like removal of HAPs or VOCs are important and serious. Actual method to resolve the above problems is expected to be special for Dioxin in Japan. Some new approches were carried out by using new chemical reactor “PACT”, whose concept is based on the synergistic effects between plasma excitation and catalytic activation. It was found that PACT has the possibility to decompose dioxin at one atmospheric pressure.
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  • Effects of M-C (M=Cr, Mn, Mo, Nb, Ti, and W) atomic pairs on creep properties of Fe-M-C ternary alloys
    Taichi ABE, Hidehiro ONODERA
    2001 Volume 13 Issue 3 Pages 505-508
    Published: March 15, 2002
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.2978/jsas.13.505
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    Effects of solute elements on the creep strength were examined by using Fe-M-C (M=Cr, Mn, Mo, Nb, Ti, and W) and Fe-C alloys in view of M-C atomic pairs. Measurements of instantaneous elongation and contraction as a function of stress change revealed the existence of instantaneous plastic strain during steady state creep in all alloys. This indicates that the steady state creep of these alloys is controlled by the recovery process as in pure metals. From analysis by the model proposed by Sandström, it is concluded that M-C pair reduces the climb velocity of dislocations due to large interaction energies with dislocations. The magnitude of the reduction can be estimated from the binding energy between M and C atoms and the diffusion coefficient of M atom.
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  • Catalytic dechlorination of polychlorinated biphenyls and polychlorinated dibenzo-p-dioxins with supported noble metal catalysts
    Yuji UKISU, Tatsuo MIYADERA
    2001 Volume 13 Issue 3 Pages 509-512
    Published: March 15, 2002
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.2978/jsas.13.509
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    Catalytic dechlorination of polychlorinated biphenyls (PCBs) and polychlorinated dibenzo-p-dioxins (PCDDs) was carried out in a solution of NaOH in 2-propanol with supported noble metal catalysts under mild conditions. In the presence of Pd/C or RhIC, dechlorination of PCBs (KC-400) efficiently occurred at temperatures below 82°C to give biphenyl as a main chlorine-free product. PCDDs such as 2, 7-dichlrodibenzo-p-dioxin (2, 7-DCDD) and 1, 2, 6, 7-tetrachlorodibenzo-p-dioxin (1, 2, 6, 7-TCDD) were converted to dibenzo-p-dioxin with Pd/C at 30°C. It was proposed that the dechlorination reaction includes hydrogen transfer from 2-propanol to organic chlorides.
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  • Preparation of MoSi2-X(X=B, Al, Nb) alloys by MA-PDS process
    Yong-Ho PARK, Aidang SHAN, Hitoshi HASHIMOTO
    2001 Volume 13 Issue 3 Pages 513-516
    Published: March 15, 2002
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.2978/jsas.13.513
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    Mechanical alloying and pulse discharge sintering (MA-PDS) process was employed to fabricate MoSi2 alloys with additions of Al, B or Nb alloy elements. Microstructure and mechanical properties of these alloys were investigated. A heat release process was identified during milling. This process is related to the reaction from pure elements to the intermetallic MoSi2. The MoSi2 alloys fabricated by MA-PDS process showed a very fine microstructure as compared to a sample sintered from commercial MoSi2 powder. Significant hardness increase was found due to microstructure refinement for binary MoSi2. Alloys made from powders milled in Air show higher hardness compared to those made with powders milled in Ar gas. This was attributed the oxides formed during milling process.
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  • Cascade-type flow of lignocellulosic components through the phase-separation system
    Yukiko NAGAMATSU, Keigo MIKAME, Eriko OHMAE, Masamitsu FUNAOKA
    2001 Volume 13 Issue 3 Pages 517-520
    Published: March 15, 2002
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.2978/jsas.13.517
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    For the successive total utilization of lignocellulosics, the phase-separation system has been developed. A key of this system is the phase-separation treatment with phenol compounds and concentrated acid. Without heating and pressing, the cell wall with IPN structures is separated into the lignin-based polymers (lignophenols) and carbohydrates within 1 hour. The functionality of materials can be controlled by the properties of phenol and acid in the phase-separation system. The lignophenols had unique properties that conventional lignins did not have. Furthermore, the functionality of lignophenols was controllable using the intramolecular switching function (cleavages of C2-aryl ether linkages by nucleophilic attack of C1-phenolic nuclei to C2). The carbohydrates can be converted to functional oligo-saccharides, simple sugars, alcohols etc. The phase-separation system would form the basis of an advanced molecular-level refining and recycling system for forestry products.
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  • Process life cycle assessment with modified allocating method in PCB producing factory
    Young-Seog KIM, Seong-Ho HAN, Haepyo CHUN, Myeong-Keun HAN, Hyeong-Ho ...
    2001 Volume 13 Issue 3 Pages 521-524
    Published: March 15, 2002
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.2978/jsas.13.521
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    Applying life cycle assessment in PCB (printed circuit board) production, most of environmental impacts come from outside-factory-process due to power generation, especially, and other raw material productions. Relatively, small environmental impacts of inside-factory-process make it difficult to compare them. To overcome this problem, allocating environmental impacts of outside-factory-process on inside-factory-process. It helps to identify the environmental impacts of each process and find sources of environmental impacts.
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  • La-modified bismuth titanate thin films prepared by Sol-Gel process
    Wen ZHANG, Chi YU, Jianguo ZHU, Dingquan XIAO, Linli MENG, Xiaowu YUAN ...
    2001 Volume 13 Issue 3 Pages 525-528
    Published: March 15, 2002
    Released on J-STAGE: February 25, 2010
    DOIhttps://doi.org/10.2978/jsas.13.525
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    The lead-free ferroelectric lanthanum modified bismuth titanate (Bi4-xLaxTi3O12, BLT-10x) thin films were prepared by sol-gel method using tetrabyl titanate, bismuth nitrate and lanthanum nitrate. Polycrystalline BLT-5 thin films were obtained at relatively low annealing temperatures of 600-650°C. The intensity of XRD peaks of BLT-5 thin films was increased with the increase of annealing temperature. The typical cohesive electric field (Ec) and remnant polarization (Pr) for BLT-5 thin films annealed at 650°C were Ec=65kV/cm, Pr=11.2μC/cm2. The affection of heat treatment on the crystalline and electric properties of BLT-5 thin films was also discussed.
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