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Thermal stability of sintered and bonded rare-earth magnets (1999)

Kato, Yoshio

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

Journal of Applied Physics 85 (1999), S. 4868-4870

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: One of most important issues of magnets for automobiles is thermal stability. The aim of the present work is to make clear the available temperature limit of sintered and bonded magnets for automobile applications. Thermal stability was determined by the critical temperature of 3% irreversible flux loss (T−3%φ) under thermal cycles. For instance, the T−3%φ of sintered NdFeB magnets (Pc=0.5) with the intrinsic coercivity of 1600, 1920, and 2240 kA/m, were 393, 423, and 453 K, respectively. On the other hand, the T−3%φ of HDDR-NdFeB (HcJ=960 kA/m) and SmFeN (HcJ=560 kA/m) bonded magnets (Pc=2) were about 353 K. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.370048

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Detection of substances with alcoholic or phenolic hydroxyl groups by generation of hydrogen peroxide with imidazole and peroxyoxalate chemiluminescence (1995)

Nozaki, Osamu ; Iwaeda, Toshinao ; Kato, Yoshio

New York : Wiley-Blackwell

Journal of Bioluminescence and Chemiluminescence 10 (1995), S. 339-344

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ISSN: 0884-3996

Keywords: imidazole ; peroxyoxalate chemiluminescence ; sugar ; monophenol ; polyphenol ; Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Chemistry and Pharmacology

Notes: On-line detection of substances with an alcoholic or phenolic hydroxyl group using imidazole and peroxyoxalate chemiluminescence was investigated qualitatively using a flow-injection method. The substances tested included six polyphenols, five monophenols and six sugars. After incubation at 80°C with an imidazole buffer (pH 9.5) the substances were detected by peroxyoxalate chemiluminescence. The polyphenols tested (e.g., pyrogallol, purpurogallin, and dopamine) showed the strongest light emission. The sugars with hydroxyl groups (e.g., fructose and lactose) and the monophenols (e.g., phenol, serotonin, and β-estradiol) produced only a weak light emission. Reaction of hydroxyl compounds and imidazole generated hydrogen peroxide. Imidazole served two roles, it catalysed the reaction with the hydroxyl compound and initiated peroxyoxalate chemiluminescence on-line. A novel reactor formed by packing glass beads into a flow cell (Teflon) of a chemiluminometer improved the sensitivity of light detection.

Additional Material: 3 Ill.