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  1. Article

    Open Access

    Influence of Tertiary Gamma Prime (γ′) Size Evolution on Dwell Fatigue Crack Growth Behavior in CG RR1000

    This work investigates coarsening behavior of strengthening precipitates (γ′) in coarse-grained RR1000 after isothermal exposure for various times (50 to 500 hours) at 700 °C and 750 °C. The impact of these isoth...

    F. Schulz, H. Y. Li, H. Kitaguchi, D. Child… in Metallurgical and Materials Transactions A (2018)

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  2. No Access

    Article

    Imperfection of microstructural control in MgB2 superconducting tapes fabricated using an in-situ powder-in-tube process: toward practical applications

    MgB2 is a promising superconductor for future applications to superconduct wires and tapes used at the liquid hydrogen temperature (20 K). Because the maximal superconducting current (critical current) in MgB2 de...

    S. Hata, H. Sosiati, Y. Shimada, A. Matsumoto, K. Ikeda… in Journal of Materials Science (2013)

  3. No Access

    Article

    A brainstem variant of reversible posterior leukoencephalopathy syndrome

    Reversible posterior leukoencephalopathy syndrome (RPLS) is caused by various heterogeneous factors, the commonest being hypertension, followed by nonhypertensive causes such as eclampsia, renal diseases and i...

    H. Kitaguchi, H. Tomimoto, Y. Miki, A. Yamamoto, K. Terada, H. Satoi… in Neuroradiology (2005)

  4. No Access

    Article

    Fabrication and Properties of Powder-in-Tube Processed MgB2 Tapes and Wires

    MgB2 tapes were fabricated with MgB2 powder and several sheath materials such as Cu, Cu-Ni, Fe, carbon steel (Fe-C) and stainless steel. High-density MgB2 cores were obtained for these sheath materials. J c of th...

    H. Kumakura, A. Matsumoto, H. Fujii, H. Kitaguchi… in Journal of Low Temperature Physics (2003)

  5. No Access

    Chapter and Conference Paper

    Low Temperature Synthesis of Bi-2212 Phase by Li Addition

    The effects of Li addition on the Bi-2212 Phase (near stoichiometric compositions) are studied. The samples with nominal compositions of Bi2.1Sr1.9CaCu2LixOz (x=0~0.6) were heated in air at temperatures ranging b...

    I. Chong, H. Kitaguchi, K. Togano in Advances in Superconductivity XII (2000)

  6. No Access

    Article

    High-temperature X-ray Study of Melting and Solidification of the Bi2Sr2CaCu2O8+δ on Silver

    The melting and solidification of a Bi 2 Sr 2 CaCu 2 O 8+δ compound on Ag were studied by in-situ high-temperature x-ray analysis. Bi 2 Sr 2 CaCu 2 O 8+δ/Ag samples were heated by the heating schedule known as ‘...

    T. Hatano, C. S. Kim, H. Kitaguchi, H. Kumakura… in Journal of Low Temperature Physics (1999)

  7. No Access

    Article

    Microstructure controls and their effects on the properties of Bi2Sr2Ca1Cu2Ox superconductors

    This paper reports our recent progresses in the development of Bi2Sr2Ca1Cu2O x /Ag tape conductors for the applications of magnetic field generation in liquid helium or around 20...

    K Togano, H Kumakura, H Kitaguchi, H Fujii, H Miao… in Bulletin of Materials Science (1999)

  8. No Access

    Chapter and Conference Paper

    Fabrication and Transport Properties of Bi-2212/Ag Continuously-wound 16-Stack Pancake Coil

    A continuously-wound 16-stack pancake coil without joints has been successfully fabricated with a silver sheathed Bi-2212 tape by the wind & react process. The fabricated coil has a 65mm winding inner diameter...

    K. Fukushima, K. Tanaka, T. Wakuda, M. Okada, K. Ohata… in Advances in Superconductivity XI (1999)

  9. No Access

    Chapter and Conference Paper

    Development of a New Type Bi-2212 Multi-Filamentary Wire

    A new type of Bi-2212/Ag round wire, “ROSATwire”, has been developed. The wire was fabricated by stacking and assembling the multi-filamentary Bi-2212/Ag tapes with triple rotation symmetry. The 990-filament ROSA...

    K. Ohata, J. Sato, M. Okada, K. Tanaka, H. Kitaguchi… in Advances in Superconductivity XI (1999)

  10. No Access

    Chapter and Conference Paper

    Processing Related Issues on High Jc Bi-2212/Ag Multilayer Tapes Prepared by Pair Process

    100 m-class Bi-2212 multilayer superconducting tapes were prepared by using the PAIR process. The Ic value of the tape strongly depends on the carbon content before the melt-solidification. Lower carbon contents ...

    T. Koizumi, T. Hasegawa, H. Kitaguchi, H. Miao… in Advances in Superconductivity XI (1999)

  11. No Access

    Chapter and Conference Paper

    Microstructures and properties of Bi2212 tapes and bulks grown in high magnetic field

    Bi2212 tapes and bulks were heat-treated in high magnetic fields HA up to 10T. Obvious texture is developed in Pb-doped Bi2212 bulk ceramics by solidification from partial melting in a HA of 9T. The magnetic fiel...

    H. Maeda, W. P. Chen, K. Kakimoto, P. X. Zhang… in Advances in Superconductivity XI (1999)

  12. No Access

    Chapter

    Improvement of Superconducting Properties on Bi2Sr2CaCu2Ox Multilayer Superconducting Tape and It’s Application

    In order to improve the superconducting properties of Bi-2212/Ag multilayer tape, we reduced the Ca and Cu concentrations in the starting superconducting powder. Phase analyses using the HT-XRD measurement ind...

    T. Hasegawa, Y. Hikichi, Y. Aoki… in Advances in Cryogenic Engineering Material… (1998)

  13. No Access

    Chapter and Conference Paper

    Effect of Cu Concentration on the Microstructure and Superconducting Properties of Bi-2212/Ag Tapes

    The influence of Cu content on the phase formation was investigated by changing X from -0.2 to 0.2 in the Bi2Sr2CaCu2+xOy /Ag tapes. As the results, we observed the decrease of Cu content of the starting composit...

    Y. Hishinuma, H. Kumakura, H. Kitaguchi, K. Togano in Advances in Superconductivity X (1998)

  14. No Access

    Chapter

    Study on Reproducibility of Transport Critical Current for HTSC

    Standardization of the measurement procedure for transport critical current, which is the most important superconducting property of conductors, is expected in the fields of conductor fabrication for practical...

    H. Kitaguchi, K. Itoh, H. Wada, K. Togano in Advances in Cryogenic Engineering Material… (1998)

  15. No Access

    Chapter

    Development of Bi-2212 Tapes and Coils Applying the Dip-Coating Process

    We have fabricated Bi-2212 pancake coils using Bi-2212/Ag tapes prepared by the combination of the continuous dip-coating and a melt-solidification processes. The coils were tested at various temperatures and ...

    H. Kumakura, H. Kitaguchi, K. Kato… in Advances in Cryogenic Engineering Material… (1997)

  16. No Access

    Chapter

    Superconducting Properties of Bi2Sr2CaCu2Oy Tape Prepared by the Continuous Heat Treatment Technique

    85m-long Bi2Sr2CaCu2Oy (Bi-2212)/Ag multilayer tape was successful fabricated. The tape was prepared by the slurry-painting technique. The multilayer tape was facricated by stacking three Bi-2212/Ag monolayer tap...

    T. Hasegawa, Y. Hikichi, H. Kumakura… in Advances in Cryogenic Engineering Material… (1997)

  17. No Access

    Chapter

    Effect of Oxygen Partial Pressure on Superconducting Properties of Bi-2212/Ag Tapes Prepared by Doctor-Blade Method

    We have investigated the relationship between oxygen partial pressure (PO2) during the partial-melting process and superconducting properties for doctor-blade processed Bi-2212/Ag tapes. Tapes were heat-treated a...

    N. Inoue, M. Okada, K. Higashiyama, K. Kato… in Advances in Cryogenic Engineering Material… (1997)

  18. No Access

    Chapter

    Peptide synthesis

    Peptide bond formation by protease catalysis offers several advantages over chemical methods, including absence of racemization, minimal activation and side-chain protection requirement, and the enzyme’s high ...

    H. Kitaguchi in Enzymatic Reactions in Organic Media (1996)

  19. No Access

    Article

    Effects of High Magnetic Field and Tensile Stress on Martensitic Transformation Behavior and Microstructure At 4 K in Fe-Ni-C Alloys

    Effects of high magnetic field and tensile stress on martensitic transformation behavior and microstructure at 4 K have been studied in Fe-31Ni-0.4C and Fe-27Ni-0.8C shape memory alloys. It was found that the ...

    H. Ohtsuka, K. Nagai, S. Kajiwara, H. Kitaguchi… in MRS Online Proceedings Library (1995)

  20. No Access

    Article

    Fabrication of uniform Al-Pb-Bi monotectic alloys under microgravity utilizing the Space Shuttle: microstructure and superconducting properties

    Al-Pb-Bi monotectic alloys with three different compositions were melted and solidified under a microgravity environment in the Space Shuttle. The (Pb, Bi) particles were dispersed uniformly in the aluminium m...

    H. Fujii, T. Kimura, H. Kitaguchi, H. Kumakura, K. Togano… in Journal of Materials Science (1995)

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