International Journal of Applied Electromagnetics and Mechanics - Volume 16, issue 3-4

Article Type: Editorial

Abstract: Preface to the ASAEM 2001 special issue.

DOI: 10.3233/JAE-2002-263

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 127-127, 2002

Authors: Nakano, H. | Okabe, Y. | Nakayama, Y. | Yamauchi, J.

Article Type: Research Article

Abstract: This paper describes a rectangular spiral antenna backed by a conducting plane of finite extent. The distance between the spiral and the conducting plane is chosen to be extremely small: 0.07 wavelength at a test frequency of 3 GHz. For analysis, the finite-difference time-domain (FDTD) method is used. The radiation characteristics, including the current distribution, input impedance, radiation pattern, axial ratio, and gain, are revealed and discussed. It is found that absorbing materials inserted into the …space between the conducting plane and the peripheral region of the spiral contribute to the wideband frequency characteristics of the axial ratio and input impedance. Show more

DOI: 10.3233/JAE-2002-230

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 129-137, 2002

Authors: Juhui, Yu | Yongming, Li | Jian, Huang

Article Type: Research Article

Abstract: In this paper, the electromagnetic scattering property of a square tabular conductor coated with anisotropic material in three-dimension is studied via Finite-Difference Time-Domain (FDTD) method. From the results, one can find that if the parameters of the anisotropic material change, the backward scattered field will also change. And lower backward scattered field can be obtained by adjusting the parameters of coated anisotropic material.

Keywords: FDTD, anisotropic material, electromagnetic scattering

DOI: 10.3233/JAE-2002-231

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 139-144, 2002

Authors: Xie, Yaoqin | Ma, Xinshan

Article Type: Research Article

Abstract: The forward problem of a realistic head model is simulated by the finite volume method (FVM)-boundary element method (BEM) coupled approach. A new mesh discretization method for the FVM is presented to simulate the realistic head model. The simulations show that this approach is convenient to calculate the forward problem of EEG with anisotropic conductivity.

DOI: 10.3233/JAE-2002-232

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 145-152, 2002

Authors: Endo, Hisashi | Saito, Yoshifuru | Hayano, Seiji | Miya, Kenzo

Article Type: Research Article

Abstract: This paper reviews the classical magneitization models for computation use, and also proposes information/intelligence technology (IT, in short) based model for the magnetodynamics in ferromagnetic materials. At first, Fourier model of the hysteretic magnetization is derived. Second, assuming the bar-like domain walls derives a domain-based model. This model is verified by a simple example. Third, a composite model by combining the Preisach with domain-based models is derived, and then, Rayleigh's law is …derived. Finally, IT based model for magnetodynamics in ferromagnetic materials is introduced. Show more

DOI: 10.3233/JAE-2002-233

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 153-161, 2002

Authors: Enokizono, Masato

Article Type: Research Article

Abstract: This paper describes the up-to-date problem and some suggestions for the numerical magnetic field analysis. Especially, what is the practical method is emphasized. Furthermore, I want to propose the development to solving the materials from solving the equation. It is the most important to analyze the magnetic field by using the measurable data. Then we must construct the fundamental equation due to the magnetic materials making the some engineering models.

Keywords: vector magnetic property, two-dimensional magnetic property, finite element method, magnetic field analysis

DOI: 10.3233/JAE-2002-234

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 163-171, 2002

Authors: Takagi, T. | Khovailo, V. | Nagatomo, T. | Matsumoto, M. | Ohtsuka, M. | Abe, T. | Miki, H.

Article Type: Research Article

Abstract: Mechanical and shape memory properties of a polycrystallineNi_{2.18}Mn_{0.82} Ga alloy prepared by a PDS (Pulse Discharge Sintering) method were investigated. It was found that the material demonstrates the two-way shape memory effect after a loading - unloading cycle performed in the martensitic state, i.e. essentially without special training. The samples exhibiting the two-way shape memory effect show a significant enhancement in the magnitude of magnetic-field-induced strain.

DOI: 10.3233/JAE-2002-235

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 173-179, 2002

Authors: Wang, Feng | Tanaka, Mami | Chonan, Seiji

Article Type: Research Article

Abstract: This paper presents an unconstrained sensing technique for the detection of the respiration and heartbeats during sleep using a piezopolymer PVDF film sensor with the aim that the sensor can be used on the ordinary bed together with the condition that the use of the sensor does not interfere the daily sleep of the patient under detection. A polyvinylidene fluoride (PVDF) film is used as the sensory material in the sensor system. The film is placed …under the sheet at the location of the thorax to pick up the fluctuation of the pressure on the bed caused by the respiratory movement and heartbeats. Fundamental principle and the functional verification of the sensor system are described in details in the paper. It is shown that the respiration and heartbeats can simultaneously be detected by the sensor with the use of the wavelet decomposition analysis. Show more

DOI: 10.3233/JAE-2002-236

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 181-188, 2002

Authors: Chen, Gangzhu | Shiwa, Mitsuharu | Yoneyama, Hiroshi

Article Type: Research Article

Abstract: Magnetic testing of creep damage shows that there is a correlation between the testing signals and the creep. It is observed that the hysteresis loss and the third harmonic of the testing signals change obviously with the progress of the creep. To explain the experimental phenomena theoretically, Jiles-Atherton magnetization model is tried to predicate the change of the magnetic property. The magnetization curves in presence of the creep are simulated by introducing the microstructure changes due …to the creep into the Jiles-Atherton model. By comparison of the theoretical and experimental results, it is shown that the trend of the change of the magnetic property predicated by the simulation agrees with that observed by the magnetic testing. Show more

DOI: 10.3233/JAE-2002-237

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 189-196, 2002

Authors: Chen, Zhenmao | Aoto, Kazumi | Kato, Shyoichi | Nagae, Yuji | Miya, Kenzo

Article Type: Research Article

Abstract: In this paper, a passive nondestructive evaluation method is proposed for inspection of damage in an austenitic stainless steel of SUS304 type based on the measurement of the magnetic field caused by the damage-induced magnetization. The detectability of the proposed method is investigated by introducing mechanical damages with tensile/fatigue test and measuring the magnetic field with the flux-gate sensors. The experimental results show that the plastic or fatigue damage is possible to be recognized …from the measured signals of the natural magnetic field, which verified the feasibility to apply the proposed technique to the damage inspection. Show more

DOI: 10.3233/JAE-2002-238

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 16, no. 3-4, pp. 197-206, 2002