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Digitale Medien

Relationship between ac and dc magnetic properties of a Co-based amorphous alloy : 38th Annual Conference on Magnetism and Magnetic Materials (1994)

Lim, S. H. ; Choi, Y. S. ; Noh, T. H. ; [weitere]

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

Journal of Applied Physics 75 (1994), S. 6937-6939

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ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: How the ac effective permeability (μe) correlates with dc magnetic properties over a wide frequency range of 1 to 1000 kHz was studied, in an effort to understand the magnetization behavior of the Co-based amorphous alloy of Metglas 2714A subject to an ac magnetic field. In the low-frequency range up to 50 kHz, the correlations between μe and the dc initial permeability, and between μe and the coercivity are found to be good, the correlation coefficient being positive and negative, respectively. No definite correlation is observed with the dc maximum permeability. At high frequencies ranging from about 200 to 1000 kHz, the correlations between μe and the dc maximum permeability, and between μe and the coercivity are observed to be good, the correlation coefficient being negative and positive, respectively. The correlation of μe with the dc initial permeability is poor in this high-frequency range. The correlation with the remanence ratio is found to be rather different from the other three; the ac permeability exhibits a maximum at the value of remanence ratio of 0.5–0.6 at frequencies up to 200 kHz but, at frequencies higher than 500 kHz, it decreases linearly with the remanence ratio. From the correlation results it is considered that the dominant magnetization mechanism is the domain wall motion at frequencies up to 50 kHz and it is spin rotation at frequencies higher than 500 kHz.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.356787

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Digitale Medien

Start-up and operation of anaerobic biofilters with packing alternatives (1989)

Choi, Y. S. ; Shin, E. B. ; Chang, H. N. ; [weitere]

Springer

Bioprocess and biosystems engineering 4 (1989), S. 275-281

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ISSN: 1432-0797

Quelle: Springer Online Journal Archives 1860-2000

Thema: Werkstoffwissenschaften, Fertigungsverfahren, Fertigung

Notizen: Abstract Four types of anaerobic upflow biofilters: non-packed (NP-AUBF), two-stage (2S-AUBF), multi-stage (MS-AUBF) and fully-packed (FP-AUBF), were tested for their start-up and operational performance characteristics. The volume of each filter was 12.1 dm3 (10 cm I.D.x155 cm in height). Stepwise seeding was conducted and the effect on the reduction of COD and gas production was monitored. When each reactor was loaded with 2 and 4 kg COD/m3-day of synthetic waste simulating alcohol production plant, 2S-, MS-, FP-AUBF had treatment efficiencies of 89–93%, while NP-AUBF showed efficiencies lower than 50%. As a conclusion, 2S- or MS-AUBF can be used as efficiently as FP-AUBF, while the amount of packings in the former is half that in FP-AUBF.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00368902

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Digitale Medien

A mountain pass method for the numerical solution of semilinear wave equations (1993)

Choi, Y. S. ; McKenna, P. J. ; Romano, M.

Springer

Numerische Mathematik 64 (1993), S. 487-509

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ISSN: 0945-3245

Schlagwort(e): 65M60

Quelle: Springer Online Journal Archives 1860-2000

Thema: Mathematik

Notizen: Summary It is well-known that periodic solutions of semilinear wave equations can be obtained as critical points of related functionals. In the situation that we studied, there is usually an obvious solution obtained as a solution of linear problem. We formulate a dual variational problem in such a way that the obvious solution is a local minimum. We then find additional non-obvious solutions via a numerical mountain pass algorithm, based on the theorems of Ambrosetti, Rabinowitz and Ekeland. Numerical results are presented.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01388701

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