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Digitale Medien

Effect of order-disorder transition on magnetic properties of high silicon-iron single crystals (1985)

Arai, K. I. ; Ohmori, K. ; Miura, H. ; [weitere]

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

Journal of Applied Physics 57 (1985), S. 460-464

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Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Using high silicon-iron single crystals containing around 6.5 wt. % silicon, the quenching temperature dependence of the saturation magnetization, the magnetocrystalline anisotropy constant, and the magnetostriction constants were measured at room temperature. The saturation magnetization and the anisotropy constant of the crystals with 4.9–6.0 wt. % silicon quenched into oil from 1100 °C showed decreases of up to 12 and 80%, respectively, compared to crystals cooled slowly from 1100 °C, while the saturation magnetostriction constants λ100 and λ111 increased for quenched crystals. The decreases in the saturation magnetizations and the anisotropy constants and the increases in the saturation magnetostriction constants for the quenched crystals were correlated with decreases in an order parameter calculated from x-ray measurements.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.334773

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Digitale Medien

Dynamics of the spinal cord: an analysis of functional myelography by CT scan (1988)

Ishida, Y. ; Suzuki, K. ; Ohmori, K.

Springer

Neuroradiology 30 (1988), S. 538-544

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ISSN: 1432-1920

Schlagwort(e): CT myelography ; Laminectomy ; Laminoplastic surgery ; Myelopathy ; Postoperative spinal deformity ; Spinal cord dynamics ; Suspension laminotomy

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary The antero-posterior movement of the spinal cord with flexion and extension of the neck was analyzed in order to clarify the mechanism of spinal cord compression in cases with postoperative spinal deformity, and to contribute to the improvement of the surgical methods of conventional laminectomy. The control subjects were 47 cases without cervico-thoracic neurological symptoms, who underwent CT myelography in flexion and extension of the neck; the cervical spinal cord was examined in 27 of these cases and the thoracic cord in the other 20. CT myelography was also carried out in 16 patients with cervical myelopathy and in 5 patients after posterior decompression surgery (suspension laminotomy). CT sections in flexion and extension of the neck were analyzed for 1) change of configuration of the dura mater and the spinal cord, and 2) antero-posterior shift of the spinal cord in the subarachnoid space. In the control subjects, the configuration of the dura mater was slightly flattened at C5/6, C6 and C6/7 in extension of the neck. The cervical spinal cord shifted anteriorly in flexion and posteriorly in extension of the neck, and was flattened at the midcervical level in flexion in the control subjects. There was a statistically significant correlation between the location of the spinal cord and the adjacent intervertebral angles at the levels of C4, C5 and C6. These results were compared with the results from the 16 patients with cervical myelopathy and 5 patients after suspension laminotomy. The thoracic spinal cord shifted anteriorly in neck flexion and posteriorly in extension, especially at upper thoracic level. In order to avoid spinal cord compression due to anterior shift of the spinal cord caused by postoperative kyphosis, it is necessary to employ the surgical method which can prevent postoperative kyphotic deformity.