The Free-Running-Type Equilibrium Ultracentrifuge

Goto, Yasuyuki; Miyazawa, Yuji; Sudo, Takuro

doi:10.1299/jsme1958.4.598

Cited by 4 publications

(1 citation statement)

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“…In 1952, Mimura and Taniguchi at Tokyo Institute of Technology reported their study on magnetic bearings (9) . In 1960, the Central Research Laboratory, Hitachi, Ltd., developed a magnetically supported prototype free-running equilibrium type ultracentrifuge (10) . In the 1960s and 1970s, a group led by Sasaki, Mori, Okino, and Watanabe at Kyoto University and a group led by Taniguchi and Shimizu at Tokyo Institute of Technology intensively studied magnetic bearings (11) (12) (13) .…”

Section: General Descriptionmentioning

confidence: 99%

Reviews of Magnetic Bearing Development in Japan

Takahashi

2013

JSDD

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In the 1980s, active magnetic bearings attracted attention because of their benefits that include contact-free support, no lubrication and low energy consumption, and their industrial applications were extensively studied. In the 1990s, the latest control theories were applied to magnetic bearings, and bearingless drive technologies were established. Magnetic bearings were increasingly applied to industrial machinery and started to find use in artificial hearts. The number of researchers engaged in research on magnetic bearings rapidly increased in Japan, and many achievements were reported. Currently, however, less research is being carried out. In this article, Japan's contribution to the research and development of magnetic bearings is reviewed, particularly key works in the early days of magnetic bearings, from various aspects such as control, rotordynamics, self-sensing, bearingless drives, bearing loss, touchdown bearings, industrial applications, and standardization.

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Section: General Descriptionmentioning

confidence: 99%

Reviews of Magnetic Bearing Development in Japan

Takahashi

2013

JSDD

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Ultrazentrifugen

Elias

1964

Chemie Ingenieur Technik

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Ultracentrifugal equilibrium measurement of high polymer solutions at elevated temperatures

Kotera

Iso

Senuma

et al. 1967

J. Polym. Sci. A‐2 Polym. Phys.

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To investigate the solution properties of polyethylene, which has the simplest structure of the vinyl polymers, experiments were made with a magnetically suspended equilibrium ultracentrifuge. Preliminary studies were carried out with a polystyrene–chloroform system at 25°C. and a polystyrene–methylcyclohexane system at 68°C. (which is close to the theta temperature) in order to check the difficulties involved in the flotation equilibrium in the former case and the high temperature measurement in the latter. However, no trouble was encountered in either system, and the results were discussed and compared with earlier results for polystyrene solutions. It was found that chloroform is a good solvent for polystyrene, and the measured weight‐average molecular weight is somewhat smaller than the value obtained in a theta solvent. After overcoming some technical difficulties involved in studies at higher temperatures, we carried out experiments on polyethylene in α‐chloronaphthalene at 130°C. The results are considered reasonable by comparison with results obtained by other methods. The sample employed, Marlex 50 of melt index 0.7, has a wide molecular weight distribution: i.e., Mz/Mw = 5.2 and Mz+1/Mz = 2.4.

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The Free-Running-Type Equilibrium Ultracentrifuge

Cited by 4 publications

References 0 publications

Reviews of Magnetic Bearing Development in Japan

Reviews of Magnetic Bearing Development in Japan

Ultrazentrifugen

Ultracentrifugal equilibrium measurement of high polymer solutions at elevated temperatures

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