Search Results - (Author, Cooperation:R. Kanno)

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  1. 1
    G. Kobayashi ; Y. Hinuma ; S. Matsuoka ; A. Watanabe ; M. Iqbal ; M. Hirayama ; M. Yonemura ; T. Kamiyama ; I. Tanaka ; R. Kanno
    American Association for the Advancement of Science (AAAS)
    Published 2016
    Staff View
    Publication Date:
    2016-03-19
    Publisher:
    American Association for the Advancement of Science (AAAS)
    Print ISSN:
    0036-8075
    Electronic ISSN:
    1095-9203
    Topics:
    Biology
    Chemistry and Pharmacology
    Computer Science
    Medicine
    Natural Sciences in General
    Physics
    Published by:
    http://www.aaas.org/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Steinhauer, Loren C. ; Ishida, A. ; Kanno, R.

    [S.l.] : American Institute of Physics (AIP)
    Published 1994
    Staff View
    ISSN:
    1089-7674
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    New results show that a toroidal plasma can be ideally stable to gross modes without a toroidal magnetic field. Previous ideal-magnetohydrodynamic (MHD) studies for such systems [commonly called field-reversed configurations (FRC)] have consistently predicted instability to the tilting mode (lowest-order kink mode). However, a new range of equilibria not previously considered are found, which are stable to tilting in ideal-MHD theory. The equilibrium properties that promote stability are hollow current profile, and racetrack separatrix shape. Stable equilibria may not be possible in a θ-pinch system, but could be achieved with a properly designed vertical field coil set. The stability of FRC's in past θ-pinch experiments arises partly from nonideal effects, but benefits considerably from hollow current profile and racetrack separatrix shape.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.870703

    Articles: DFG German National Licenses
  3. 3
    Shojiya, M. ; Takahashi, M. ; Kanno, R. ; Kawamoto, Y.

    Woodbury, NY : American Institute of Physics (AIP)
    Published 1998
    Staff View
    ISSN:
    1077-3118
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Optical absorption and multiphonon relaxation have been investigated for Nd3+-doped ZnCl2-based glass. The intensity parameters for radiative transitions of Nd3+ were determined to be Ω2=4.97×10−20 cm2, Ω4=7.39×10−20 cm2 and Ω6=5.12×10−20 cm2. All of the Ωt parameters, especially Ω4, of Nd3+ in the ZnCl2-based glass were large compared with those reported for oxide and fluoride glasses. Multiphonon relaxation rates for three emission levels of Nd3+ were determined from lifetime measurements. The multiphonon relaxation rates in the ZnCl2-based glass were extremely low, because of the low-phonon-energy of the matrix. Values were found to obey the energy-gap law in the same manner as the values in Er3+-doped ZnCl2-based glasses. © 1998 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.120924

    Articles: DFG German National Licenses
  4. 4
    Shojiya, M. ; Takahashi, M. ; Kanno, R. ; Kawamoto, Y. ; Kadono, K.

    [S.l.] : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    Optical absorption and emission properties of Er3+ ions in ZnCl2-based glasses are investigated. The electric dipole line strengths for various transitions were estimated from the measured optical absorption spectra. The spontaneous emission probabilities for various transitions were predicted using the Judd–Ofelt theory. Among Ωt (t=2, 4, 6) phenomenological intensity parameters, the Ω2 value is larger than that measured for ZrF4-based glass. On the contrary, the Ω4 and Ω6 values are comparatively small. Multiphonon relaxation rates follow a so-called "energy-gap law" which is given by WMPR=C exp(−αΔE). The C value is quite smaller than that of the ZrF4-based glass by about two orders of magnitude. This result is attributed to the very low-phonon-energy of the chloride glass matrix. On the other hand, the α value is almost the same as those of other glass hosts. Because of the low-phonon-energy and the host-independent α value, the electron–phonon coupling constant ε of the ZnCl2-based glass is extremely large compared with those of oxide and fluoride glasses. It was also found that several emissions due to transitions between the excited 4 f-levels are detectable, which are hardly observed in other glass hosts. Radiative quantum efficiency is definitively high even for emitting levels of which the energy-gap to the next-lower level is small. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.366545

    Articles: DFG German National Licenses
  5. 5
    Ishida, A. ; Kanno, R. ; Steinhauer, L. C.

    New York, NY : American Institute of Physics (AIP)
    Published 1992
    Staff View
    ISSN:
    1089-7666
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    The gyroviscous fluid theory [L. C. Steinhauer and A. Ishida, Phys. Fluids B 2, 2422 (1990)] is applied to the tilting instability of field-reversed configurations (FRC) using realistic equilibria and a more complete basis set than in the previous treatment. This leads to two important new results. (1) Quantitative agreement is found for the first time between experiment and the theory of FRC tilting stability, i.e., the stability of nearly all FRCs can be explained by the gyroviscous theory. (2) Quantitative agreement (within 30%) is also found between the gyroviscous theory (with modifications to account approximately for parallel kinetics and the Hall effect) and the more complete—but harder to apply—Vlasov-fluid model.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.860083

    Articles: DFG German National Licenses
  6. 6
    Takahashi, M. ; Shojiya, M. ; Kanno, R. ; Kawamoto, Y.

    [S.l.] : American Institute of Physics (AIP)
    Published 1997
    Staff View
    ISSN:
    1089-7550
    Source:
    AIP Digital Archive
    Topics:
    Physics
    Notes:
    We have investigated the decay processes of the Er:4S3/2 and 4F9/2 states and the mechanisms of frequency upconversion under 800 nm excitation of Er3+ in ternary ZrF4–BaF2–LaF3 glasses. The decay processes of the Er:4S3/2 and 4F9/2 states are discussed on the basis of the Er concentration dependence of the fluorescence lifetime. The quantum efficiencies of emission of the 4S3/2 and 4F9/2 states are 73% and 25%, respectively. The difference in the quantum efficiencies between these states can be explained from the difference in the multiphonon decay rates: the multiphonon decay rate of the 4S3/2 state is much smaller than that of the 4F9/2 state. The multiphonon relaxation is a dominant nonradiative decay process of the 4F9/2 state. A dominant nonradiative decay process of the 4S3/2 state is self-quenching at high Er concentrations. The upconversion mechanisms under 800 nm excitation are also investigated from the dependence of upconversion luminescence on excitation wavelengths (800 and 980 nm), excitation laser power, and Er concentration. The mechanism of upconversion from 800 to 660 nm is mainly due to the energy transfer between the 4I9/2→4I13/2 and 4F9/2←4I11/2 transitions. We also show that the upconversion from 800 to 550 nm is due to excited-state absorption. © 1997 American Institute of Physics.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1063/1.364324

    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    0921-4534
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4534(89)90150-0

    Articles: DFG German National Licenses
  8. 8
    Takanq, M. ; Hiroi, Z. ; Mazaki, H. ; Bando, Y. ; Takeda, Y. ; Kanno, R.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0921-4534
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/S0921-4534(88)80125-4

    Articles: DFG German National Licenses
  9. 9
    Staff View
    ISSN:
    0921-4534
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4534(89)90028-2

    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    0022-4596
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/S0022-4596(05)80274-9

    Articles: DFG German National Licenses
  11. 11
    Staff View
    ISSN:
    0022-4596
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1006/jssc.1994.1116

    Articles: DFG German National Licenses
  12. 12
    Staff View
    ISSN:
    0022-4596
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1016/S0022-4596(05)80299-3

    Articles: DFG German National Licenses
  13. 13
    Staff View
    ISSN:
    0022-4596
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1006/jssc.1994.1162

    Articles: DFG German National Licenses
  14. 14
    Hiroi, Z. ; Takano, M. ; Bando, Y. ; Takeda, Y. ; Kanno, R.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0921-4534
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0921-4534(89)90329-8

    Articles: DFG German National Licenses
  15. 15
    Staff View
    ISSN:
    0167-2738
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0167-2738(86)90016-0

    Articles: DFG German National Licenses
  16. 16
    Staff View
    ISSN:
    0167-2738
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0167-2738(83)90027-9

    Articles: DFG German National Licenses
  17. 17
    Takahashi, T. ; Kanno, R. ; Takeda, Y. ; Yamamoto, O.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0167-2738
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0167-2738(81)90099-0

    Articles: DFG German National Licenses
  18. 18
    Atake, T. ; Kawaji, H. ; Kanno, R. ; Ohno, K. ; Yamamoto, O.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0167-2738
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0167-2738(92)90322-G

    Articles: DFG German National Licenses
  19. 19
    Kanno, R. ; Nakamura, S. ; Kawamoto, Y.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0167-2738
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0167-2738(92)90343-N

    Articles: DFG German National Licenses
  20. 20
    Kanno, R. ; Takeda, Y. ; Oda, Y. ; Ikeda, H. ; Yamamoto, O.

    Amsterdam : Elsevier
    Staff View
    ISSN:
    0167-2738
    Source:
    Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics:
    Physics
    Type of Medium:
    Electronic Resource
    URL:
    http://linkinghub.elsevier.com/retrieve/pii/0167-2738(86)90310-3

    Articles: DFG German National Licenses