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Rotational Accuracy Measurement of Scroll Compressor with D-type Sectional Shaft
Sang-Shin Park,Gyu Ha Kim,Jin-Kab Lee 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
This paper presents the measurement process of the rotational accuracy and the comparison with the theoretical results in the main bearing of scroll compressor. The main bearing is cylindrical oil journal bearing, but there are straightly cut used for oil supply. Therefore the roundness error is not a negligible quantity compared with the rotational accuracy. For this reason, three-point method is used in the experiment. The result of three-point method coincides with the theoretical value. So if the theory in this paper is used to the bearing design of scroll compressor, the efforts for testing and designing can be reduced.
Culture Parameters for Nonactin Production by Streptomyces viridochromogenes JM-4151
Lee, Sang-Han,Lee, Dong-Sun,Lee, Jin-Man,Kim, Tae-Ho,Kim, Jong-Guk,Han, Kab-Cho,Lee, Jin-Sik,Kwon, Gi-Seok Korean Society of Life Science 2001 Journal of Life Science Vol.11 No.1
Nonactin is the parent compound of a group of ionophore antibiotics, that known as the macrotetrolides. In previous report, in th course of screening superoxide radical-generating compounds from microbial sources, we first screened Streptomyces viridochromogenes JM-4151 that produces nonactin. It was proved that nonactin is superoxide radical-producing compound. In present study, we examined the optimal culture conditions of nonacin. Th optimal culture conditions for nonactin production were as follows: 1% soluble starch, 1% yeast extract, 0.2% ammonium nitrate, 0.06% magnesium sulfate, 0.2% calcium carbonate, initial pH 7.0 at 28$^{\circ}C$ for 96 h. The highest nonactin production was achieved in the production medium of initial pH7.0 at 28$^{\circ}C$ for 96h. The threshold level of dissolved oxygen was found to be above 33.2% at 28$^{\circ}C$ when 1% soluble starch was used as a carbon source. These results suggest that S. viridochromogenes JM-4151 might be a possible strain for industrial nonactin producer.
Depinning Field at Notches of Ferromagnetic Nanowires With Perpendicular Magnetic Anisotropy
Kab-Jin Kim,Gi-Hong Gim,Jae-Chul Lee,Sung-Min Ahn,Kang-Soo Lee,Young Jin Cho,Chang-Won Lee,Sunae Seo,Kyung-Ho Shin,Sug-Bong Choe IEEE 2009 IEEE transactions on magnetics Vol.45 No.10
<P>In this paper, we experimentally characterize the domain-wall depinning mechanism at notches of ferromagnetic nanowires with perpendicular magnetic anisotropy. A time-resolved magneto-optical Kerr effect detection reveals that the depinning time is exponentially proportional to the strength of external magnetic field. From an analysis based on Neacuteel-Brown theory, the depinning field and the activation volume are quantitatively determined for several notches with different gap distances. Interestingly, both the depinning field and the activation volume are proportional to the inverse of the gap distance. This is explained by the sizeable extrinsic effect from geometric constrictions in contrast to the intrinsic properties of the films.</P>