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Magnetic Properties and Magnetoimpedance Effect in Mumetal Thin Films
Wan-Shik Cho,Tae-Sick Yoon,Heebok Lee,Chong-Oh Kim 한국자기학회 2001 Journal of Magnetics Vol.6 No.1
The dependence of the magnetoimpedance effect (MI) on magnetic properties has been investigated in mumetal thin films prepared by rf magnetron sputtering. Coercivity of thin films prepared at 400 W was about 0.4 Oe, and the magnetic anisotropy field of films deposited under a uniaxial magnetic field decreased with increasing film thickness. The saturation magnetization of mumetal films increased with rising input power and thickness, and was smaller than that of permalloy films. Transverse incremental Permeability (TPR) of films of 1 ㎛ thick increased with increasing effective permeability. The magneto impedance ratio (MIR) was proportional to TPR in films 1 ㎛ thick but in spite of lower effective permeability at higher thicknesses, MIR increased due to skin effect. The height of the double peaks in the MIR curves decreased with decreasing anisotropy and thickness. The maximum MIR value for a 4 ㎛ thick 75 % at 36.5 ㎒.
흰쥐 하수체적출과 몇가지 호르몬이 결장 점액세포에 미치는 영향에 대한 조직화학적 연구
심완식,배선한 최신의학사 1972 最新醫學 Vol.15 No.5
This experiment was worked out to study histochemically the effects of hypophysectomy and some hormones adminstered after the operation on the mucus secreting cells of the colon of the rat. Healthy male Swiss albino rats weighing about 200 gm were used in this experiment. Hypophysectomy was done by Falconi & Rossi's transauricular method. Administered hormones after the operation were STH (2.5 mg/kg, Raben type), ACTH (1.25IU/kg), DOCA (1 mg/kg) and D-thyroxine (0. 05 mg/kg). Animals of each group were sacrificed on 3rd and 7th day after the treatment. Sham operation group and saline injected group were used as the control. Specimens from the colons were fixed in 10% neutral formalin solution, embedded in paraffin wax, sectioned in 6u thickness, and stained with periodic acid-Schiff (PAS)-hematoxylin, alcian blue pH 2.5-PAS, and alcian blue pH 1.0-PAS respectively. Observed results were as follows: 1. Hypophysectomy resulted in distinct decrease of mucosubstance in the mucus secreting cells of the colon, especially of sulfomucin in histochemical nature and of those in the lower part of intestinal gland in their location. This is provably due to metabolic disturbance of precursors of mucosubstances. 2. Administration of each hormone after the hypophyectomy effectuate the increase of mucous content of colonic mucosa. These hormones provably not directly act to mucus secreting cells of the colon, but chiefly activate the synthesis of source materials of mucosubstances. 3. Judging from histochemical observation, sulfomucin was provably initial product among the various mucosubstances, and also one of mucosubstance which had rapid turnover. 4. Goblet cells in the lower portion of intestinal glands showed active reaction of mucus production compared with those in the upper portion of glands and the superficial epithelium.