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Magnetization behaviors in a chain of disks (1992)

Ishii, Y. ; Anbo, H. ; Nishida, K. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 71 (1992), S. 829-835

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The magnetic behavior of a chain of N disks are investigated. The critical field Hcri for the discontinuous jump of the magnetization and the coercive force Hc for the fanning mechanism, and the uniaxial magnetic anisotropy constant Ku are estimated as a function of N, the aspect ratio of the disks, and the magnetocrystalline anisotropy constant K1. By comparing the MH loops calculated and the experiments, the values of K1 and N are obtained for an assembly with random orientation of Ba ferrite particles. This value of K1 agrees well with the experimental results obtained by Fujiwara [IEEE Trans. Magn. MAG-23, 3125 (1987)].

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.351302

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Migration of an acupuncture needle into the medulla oblongata (1996)

Abumi, K. ; Anbo, H. ; Kaneda, K.

Springer

European spine journal 5 (1996), S. 137-139

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ISSN: 1432-0932

Keywords: Acupuncture needle ; Medulla oblongata ; Computed tomography

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary A case of a delayed lesion of the medulla oblongata caused by migration of an acupuncture needle is presented. The patient was a 60-year-old woman who had undergone embedded-type acupuncture needle treatment around 1975. In 1993 she was admitted to our hospital with a 3-week history of progressive motor and sensory disturbance of her right upper extremity. CT demonstrated that one needle had penetrated the medulla oblongata transversely at the level of the foramen magnum. The needle was removed surgically without any complications. This is the first report of an acupuncture needle migrating into the medulla oblongata.