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  • 1
    Electronic Resource
    Electronic Resource
    Development of domain refined grain-oriented silicon steel by grooving : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6609-6611 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently a heat-proof magnetic domain refining technique has been developed which is characterized by the introduction of grooves on a surface of steel sheet after final cold rolling. In this paper, magnetic properties and the domain refining effect of grooving are investigated. A grooving process is constituted by resist printing on the surface of steel sheets after final cold rolling and succeeding electrolytic etching. The grooves were introduced almost perpendicular to the rolling direction of steel sheets. The width and depth of each grove are about 200 and 20 μm, respectively. With this newly developed method, about 10% reduction in iron loss was achieved and less than 0.34 W/lb at 1.5 T, 60 Hz was obtained. Using this new material, the iron loss of wound core transformers can be reduced by about 10% as compared with nongrooved material. Domain width was dramatically reduced by grooving, which caused the reduction of eddy current loss. This reduction is considered to be caused by the demagnetizing field effect due to free poles in the vicinity of grooves. It was clarified that in grooved sheets the magnetization on the ungrooved surfaces proceeded faster than on the grooved surfaces and therefore, hysteresis loss and magnetizing characteristics did not deteriorate by grooving.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352526
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  • 2
    Electronic Resource
    Electronic Resource
    The thermoelectric properties and crystallography of Bi-Sb-Te-Se thin films grown by ion beam sputtering (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1252-1260 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of the substrate temperature on the composition and microstructure of Bi-Sb-Te-Se thin films are discussed and related to the Seebeck coefficient and resistivity. The films were prepared on silica substrates by argon ion beam sputtering. The effect of subsequent heat treatment is also discussed. The composition becomes stoichiometric at the substrate temperature around 500 K at which the Seebeck coefficient has a maximum and the resistivity has a minimum. The Seebeck coefficient changes its sign at the substrate temperature around 340 K. The crystal structure of the films deposited at room temperature is identified as the rock-salt type, and the change of the thermoelectric properties as a function of the substrate temperature can be mainly attributed to the volume fraction of the Bi2Te3 and rock-salt structures. The subsequent heat treatment is effective in improving the power factor of the stoichiometric thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353266
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical and magnetic properties of light rare-earth Heusler single crystals RInCu2, R=La, Pr, Nd, and Sm : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4645-4647 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrical resistivity ρ and magnetic properties of light rare-earth Heusler single crystals RInCu2, R=La, Pr, Nd, and Sm, have been measured in the temperature range 1.3–300 K. No anomalies due to magnetic transitions were found in the temperature dependence of ρ and magnetic susceptibility χ above 4.2 K. Pr and Nd Heusler compounds have large negative paramagnetic Curie temperatures −19 and −29 K, respectively. The temperature dependence of χ is discussed on the basis of the crystalline field effect. For Sm compound, χ(T) is discussed by means of Van Vleck paramagnetism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348283
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  • 4
    Electronic Resource
    Electronic Resource
    The pressure effect of the Curie temperature in TbAl2 (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5298-5299 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pressure effect of the ferromagnetic Curie temperature in Tb(Al1−xCox)2, 0≤x≤0.1 was measured by the induction method under hydrostatic pressure. The Curie temperatures of these compounds increased with increasing pressure and the derivative dTc/dp as a function of cobalt concentration did not change so much compared with that of Gd(Al1−xCox)2 [Sato et al., J. Phys. (Paris) Colloq. 49, C8-453 (1988)]. These results are discussed on the basis of the RKKY model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344588
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  • 5
    Electronic Resource
    Electronic Resource
    A spice model of orthogonal-core transformers : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4928-4930 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper deals with a numerical model of orthogonal-core transformers for use in spice. The model was devised on the basis of the magnetic circuit of the orthogonal-core with the saturation and hysteresis effects. Using the numerical model, the behavior of the dc-ac converter constructed with the orthogonal-core transformers and square-wave transistor choppers was analyzed. The calculated values and measured ones show a good agreement. The method presented here is suitable for the circuit analysis and design optimization of the dc-ac converter taking account of nonlinear characteristics of the orthognal-cores and semiconductor devices used in the converter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348178
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  • 6
    Electronic Resource
    Electronic Resource
    Performance of a low-duty pulsed Penning source for the medical synchrotron facility at NIRS : Proceedings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2904-2906 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A low-duty pulsed Penning source has been developed for the injector of the medical synchrotron facility at NIRS. The repetition rate is 1 Hz, with a duty factor of 4×10−4. The lifetime of the cathodes has been evaluated to be longer than two months, and that of the filament (cw) longer than one week. The intensity of multiply charged ions was increased by a factor of 10 compared with that obtained under dc operation. The reliability and stability were also improved. The results concerning the performance and some improvements of the source are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142794
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  • 7
    Electronic Resource
    Electronic Resource
    A global dynamo in a reversed-field pinch plasma (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2876-2881 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is found that a reversed-field pinch (RFP) dynamo uniformly generates most of the toroidal flux in a RFP plasma with a high magnetic Reynolds (S) number. Hereafter, this is referred to as the global dynamo. The toroidal flux generated by the global dynamo is proportional to the plasma current. The effective inductance in a RFP plasma increases with S number and remains constant against the changing plasma current. This means that the pinch parameter aitch-theta is held constant, that is, the global dynamo has a self-organizing effect sustaining a particular RFP configuration. By comparing simulation results and analysis of magnetic fluctuations, it is confirmed that a global dynamo is generated by the nonlinear evolution of the single-helicity of the m=1 mode alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870527
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  • 8
    Electronic Resource
    Electronic Resource
    Macroscopic behavior and discrete dynamo in high-aitch-theta reversed-field pinch discharges (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1836-1841 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetohydrodynamic (MHD) activity and the discrete dynamo in high-aitch-theta reversed-field pinch (RFP) discharges are studied through comparisons with those in normal-aitch-theta RFP discharges, where aitch-theta=Bθ(a)/〈Bz〉 is the pinch parameter. In high-aitch-theta RFP discharges, the mode coupling of m=1 is enhanced by the high magnetic shear configuration, and the MHD activity is more turbulent as compared with that in normal-aitch-theta RFP discharges. Furthermore, the discrete increase of the toroidal magnetic flux is obviously observable. The increase of the toroidal magnetic flux generated by the discrete dynamo, which has an asymmetric structure in the toroidal direction, is only 1%–2% of the whole toroidal magnetic flux. The experimental results indicate that the discrete dynamo does not play an essential role in the RFP dynamo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860820
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  • 9
    Electronic Resource
    Electronic Resource
    Simulation study of the dynamo structure in the reversed-field pinch (1993)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 5 (1993), S. 1263-1269 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamo structure in the reversed-field pinch (RFP) is studied through the nonlinear dynamics of a single-helicity mode. Simulation is concentrated upon the physical structure of nonlinear interactions of the plasma flow and magnetic fluctuation. The result indicates that when the initial equilibrium profile is deformed by resistive diffusion, the radial flow is driven near the core of the plasma. As this flow forms a vortex structure and magnetic fluctuation grows radially, the dynamo electric field is helically induced just inside the reversal surface and then the toroidal flux is increased. This dynamo electric field correlates to the nonlinear evolution of the kinetic energy of the m=1 mode, and the increase of the toroidal flux originates in the growth process of the magnetic energy of this mode. Consequently, the RFP configuration can be sustained by the single-helicity evolution of the m=1 mode alone, and the electric field induced by the interactions of the toroidal velocity and the radial magnetic field is the most dominant source on the dynamo action.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860916
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  • 10
    Electronic Resource
    Electronic Resource
    Low-duty pulsed PIG source in HIMAC : International conference on ion sources (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 466-468 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A low-duty pulsed PIG source has been developed for the injector (e/m= (1)/(7) – 1/4 ) of HIMAC. This source is of an indirectly heated PIG type. The requirement for this source is a high current with a low repetition rate and a low-duty factor. To obtain good stability during pulsed operation, the source is operated in a positive arc impedance range. Pulsed operation also allows the arc voltage to be high (1.4 kV), resulting in a high yield of multiply charged ions. With an arc pulse width of 500 μs (1 Hz and a duty of 0.05%), a useful beam pulse width of 200 μs with a peak intensity of 120 μA for Ar6+ has been obtained at an optimum gas pressure of 10−3 Torr. This intensity is higher than for cw mode by a factor of 5. A 90% emittance has also been measured to be 250π mm mrad in both the X and Y directions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141275
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