International Journal of Applied Electromagnetics and Mechanics - Volume 11, issue 1

Authors: Uesaka, Mitsuru | Slama, Jozsef

Article Type: Editorial

Abstract: The five selected papers are presented from the 3rd Japan – Central Europe Joint Workshop held in Bratislava, Slovakia, on 27–30 September 1998.

DOI: 10.3233/JAE-2000-182

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 11, no. 1, pp. 1-1, 2000

Authors: Aihara, Shin Ichi

Article Type: Research Article

Abstract: The maximum likelihood estimation (M.L.E.) for spatially-varying parameters in stochastic parabolic systems is studied. The main result is to show the consistency property of the M.L.E. for unknown parameters by using the method of sieves, i.e., first the admissible class of unknown parameters is projected into a finite-dimensional space and next the convergence of the derived finite-dimensional M.L.E. to the infinite-dimensional M.L.E. is justified under some conditions. Finally numerical examples are presented.

DOI: 10.3233/JAE-2000-170

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 11, no. 1, pp. 3-18, 2000

Authors: Sláma, J. | Krivošík, P. | Dosoudil, R. | Vicen, R. | Grusková, A. | Olah, V. | Hudec, I. | Kováčiková, S.

Article Type: Research Article

Abstract: The magnetic properties and frequency spectra were studied in magnetic composites with the MnZn powder filler in polymer matrix. The frequency response of permeability, power loss and reactive power per frequency components were measured and compared with the computed data. For this purpose the model taking into account particle morphology in the selected frequency spectrum was proposed. The frequency responses of permeability components have the adequate frequency dependencies of powers per frequency for the sinusoidal …waveform of applied magnetic field. Show more

DOI: 10.3233/JAE-2000-171

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 11, no. 1, pp. 19-25, 2000

Authors: Yamada, Koji | Shoji, Shin-ichi | Isobe, Yosihiro

Article Type: Research Article

Abstract: Magnetic properties have been investigated for a diagnosis tool of iron-based material of A533B, SUS304 in an applied stress range up to 640 MPa, by using a leakage magnetic flux sensor of GaAs Hall element, a magnetic noise pickup coil and by observing X-ray diffraction. The magnetic Barkhausen jumps were observed at an optimum field sweeping condition of 140kA/ms at which 2-D fractal dimension was found at 1.6\pm 0.3 . In this condition, averaged magnetic …fields for discontinuous magnetizations were evaluated as a monotonic increasing parameter with increasing residual stresses, insensitively to the geometrical configuration between the sensing pick-up coil and the yoke in a wide residual stress range between 0.1 and 8%. stresses in the L\"uders band were found tilted around 35 degrees. The surface leakage flux and the magnetic noise observations in this study were found detectable for the material surface less than about 50 \mu m. Show more

DOI: 10.3233/JAE-2000-172

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 11, no. 1, pp. 27-38, 2000

Authors: Slugeň, Vladimír | Haščík, Ján | Gröne, Rudolf

Article Type: Research Article

Abstract: Angular correlation positron annihilation spectroscopy (AC PAS) has been used for the investigation of reactor pressure vessel (RPV) specimens prepared for the ``Extended surveillance specimen program'' in the 3rd and 4th units of NPP Jaslovsk\'e Bohunice (Slovakia). PAS spectra showed that the changes associated with the effects of neutron irradiation can be well detected. The samples from RPV base material (15Kh2MFA) and weld (Sv 10KhMFT) were measured by angular correlation positron annihilation spectrometer before …and after irradiation. Samples have been irradiated in VVER-440 reactor (units 3 and 4 in Bohunice) by neutron fluence from 7.8\times 10^{23} m^{-2} up to 2.5\times 10^{24} m^{-2} . Results of PAS measurements are presented and discussed in detail. Show more

DOI: 10.3233/JAE-2000-173

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 11, no. 1, pp. 39-47, 2000

Authors: Demachi, Kazuyuki | Takase, Kentaro | Sugiyama, Hirotaka | Miya, Kenzo

Article Type: Research Article

Abstract: In this study the Fluxoid Dynamics (FD) method was developed to simulate the mesoscopic behavior of the fluxoids in Bi2212 single crystal. This method is based on a combination of two concepts; the Molecular Dynamics (MD) and Ginzburg-Landau (G-L) theory. The aim of this study is to predict the macroscopic electromagnetic phenomena by simulating the mesoscopic behavior of many fluxoids. The predicted results of the dependence of the increase of critical current density upon the dose …of heavy ion irradiation was compared with the experimental ones. Show more

Keywords: fluxoid dynamics method, BSCCO single crystal, AC field, heavy ion irradiation

DOI: 10.3233/JAE-2000-174

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 11, no. 1, pp. 49-55, 2000