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Low core losses and soft magnetic properties of Fe–Al–Ga–P–C–B–Si glassy alloy ribbons with large thicknesses (1999)

Mizushima, Takao ; Makino, Akihiro ; Yoshida, Shoji

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

Journal of Applied Physics 85 (1999), S. 4418-4420

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: The structure, soft magnetic properties, and core losses were investigated for a Fe77Al2.14Ga0.86P8.4C5B4Si2.6 glassy alloy with a sheet thickness in a wide range from 30 to 240 μm prepared by the melt-spinning technique. The maximum thickness (tmax) for glass formation and the thermal stability (ΔTx) of the supercooled liquid region defined by the difference between the crystallization temperature (Tx) and the glass transition temperature (Tg) are about 220 μm and 35 K, respectively. The saturation magnetization (σs) of this glassy alloy is about 1.5 T. The effective permeability at 1 kHz is as high as 12 000 in a thickness of 30 μm and it maintains high values above 4400 up to a thickness of tmax. The coercive force is kept at a low level, under 3 A/m up to tmax. This glassy alloy also shows low core loss values of 0.1–0.3 W/kg at f=50 Hz and Bm=1.0 T in the thickness from 30 to 220 μm. On the other hand, a Fe78Si9B13 amorphous alloy shows almost the same low core losses as that of the glassy alloy only in a thickness of less than 70 μm. The difference between the dependence of the soft magnetic properties and the core loss on the thickness of these alloys should arise from their difference in ability of glass forming. The Fe–Al–Ga–P–C–B–Si glassy alloys should be very useful for inductive applications because of their thick ribbon shape and good soft magnetic properties in addition to low core loss. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.369803

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The effect of methylacrylate on the activity of glucomylase immobilized on granular polyacrylonitrile (1982)

Handa, Takashi ; Hirose, Akira ; Yoshida, Shoji ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Biotechnology and Bioengineering 24 (1982), S. 1639-1652

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ISSN: 0006-3592

Keywords: Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology

Notes: Glucoamylase was immobilized on granular polyacrylonitrile (PAN) and the optimum condition in its immobilization reaction was determined. The effect of the ratio of the imidoester and methylester to the total cyanogen on the activity of the immobilized enzyme was studied. The activity of the immobilized enzyme increased in proportion to the molar number of imidoester and decreased with that of methylester. The Km and Vm values of immobilized glucoamylase which were prepared at various conditions of immobilization were determined. There were opposite trends in KmS between glucoamylase immobilized on imidoester-rich support and immobilized on methylester in the support, evidenced as functions of temperature. This suggests that opposite charges in the support, produced by heat deformation of PAN by hydrolysis of methylester, were an influence on the apparent Km of immobilized glucoamylase, besides the diffusional limitation.

Additional Material: 14 Ill.