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Your search keyword '"Fujikura, M."' showing total 122 results
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122 results on '"Fujikura, M."'

12. Transplantation of rat bone marrow-derived mesenchymal stem cells regulates oxidative stress in Alzheimer’s disease transgenic mouse model

Author

Yokokawa, K., primary, Iwahara, N., additional, Suzuki, H., additional, Emoto, M.C., additional, Hisahara, S., additional, Saito, T., additional, Fujikura, M., additional, Manabe, T., additional, Matsushita, T., additional, Matsumura, A., additional, Suzuki, S., additional, Kawamata, J., additional, Fujii, H.G., additional, and Shimohama, S., additional

Published
2017
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14. Prediction method of basic domain structure in Fe3%Si(110) single crystal with grooved surface.

Author

Iwata, K., Fujikura, M., Arai, S., and Ishiyama, K.

Subjects
*FERROMAGNETIC materials, *MAGNETIC domain, *SINGLE crystals, *EDDY currents (Electric), *FINITE element method, *FERROELECTRICITY
Abstract

This paper proposes the method to accurately predict the 180° basic domain width (Dw) in demagnetized states of the grooved Fe3%Si(110) single crystal with the tilt angle of [001] out of the sheet surface (β). The evaluation of Dw enables the estimation of the anomalous eddy current losses. In this paper, Dw is optimized to minimize the magnetic Gibbs free energy represented by vector potentials using the finite element method and the conjugate gradient method. The μ*-method is adopted to approximate the magnetization relaxation. The stray field energy generated by the magnetic charges occurring on both grooves cross section and sheet surfaces is considered in our proposed method. The validity of the proposed method was confirmed by comparison with the observed Dw. As a result, we could reveal the β dependence of Dw against the groove depth. Moreover, the theoretical threshold of the domain refinement due to the grooves has been suggested. [ABSTRACT FROM AUTHOR]

Published
2014
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15. Magnetization Curve Plotting from the Magnetic Domain Images

Author

Endo, H., Hayano, S., Saito, Y., Fujikura, M., and Kaido, C.

Subjects
Magnetization -- Measurement, Scanning electron microscopes -- Usage, Image processing -- Methods, Business, Electronics, Electronics and electrical industries
Abstract

An innovative image processing methodology is proposed to draw the magnetization curves of electrical steels. Our methodology enables to draw the continuous magnetization curve from a series of the distinct scanning electron microscope (SEM) images of magnetic domains. Our image processing methodology has two distinguished features. One is that the contrast of a domain image is regarded as an average of flux density. Another one is that domain motion observed in several domain images is represented by the image Helmholtz equation. Its solution generates any magnetized states of the magnetic domains. Moreover, computing averaged contrast of each image gives value of flux density on a magnetization curve. In this paper, we apply our methodology to the domain images of a grain-oriented electrical steel. This paper demonstrates the macroscopic- as well as microscopic-magnetization curves reflecting on their physical conditions. Index Terms--Grain-oriented electrical steel, image processing, magnetic domains, magnetization curve, scanning electron microscope.

Published
2001

17. Cu-added Nd-Fe-B anisotropic powder for permanent magnet use.

Author

Sakamoto, H., Fujikura, M., and Mukai, T.

Subjects
*ANISOTROPY, *NEODYMIUM, *IRON, *BORON
Abstract

Presents a study which fabricated neodymium-iron-boron anisotropic powder from melt-spun ribbons. Experimental details; Results and discussion; Measurement of the magnetic properties of the anisotropic powder.

Published
1991
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18. Effects of silicon and aluminum additions on magnetic properties of rapidly quenched Nd-Fe-B permanent magnets.

Author

Matsumoto, F., Sakamoto, H., Komiya, M., and Fujikura, M.

Subjects
SILICON, ALLOYS, NEODYMIUM
Abstract

Presents a study that examined the effects of silicon (Si) and aluminum (Al) on magnetic properties of melt-spun neodymium-iron-boron base alloy permanent magnets. Effect of the addition of Si to the alloy; Effect of the addition of Si on Curie temperature; Effect of the combined addition of Si and Al on wheel surface velocity.

Published
1988
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