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Your search keyword '"TZENG, C.-C."' showing total 170 results
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170 results on '"TZENG, C.-C."'

1. Plasma-pretreated catalyst for methanol synthesis from syngas

Author

Lee, H. M., Juan, L.-K., Yeh, F.-M., Li, H.-Y., Chen, H.-L., Chang, M. B., Chen, S.-H., and Tzeng, C.-C.

Subjects
Oxygen -- Electric properties, Plasma (Ionized gases) -- Usage, Biomass energy -- Research, Breakdown (Electricity) -- Analysis, Electric discharges -- Measurement, Electric discharges through gases -- Measurement, Methanol -- Electric properties, Methanol -- Thermal properties, X-rays -- Diffraction, X-rays -- Usage, Business, Chemistry, Electronics, Electronics and electrical industries
Published
2009

6. Magnetic switching and reversal process in a tip ring structure.

Author

Yung Liou, Dong-Cheng Chen, Chwen Yu, Chen, J. S., Shang-Fan Lee, Yao, Y. D., Tzeng, C. C., Chen, T. Y., Cheng, K. W., and Ron Ma

Subjects
MAGNETORESISTANCE, MAGNETIC fields, ELECTRIC resistance, LITHOGRAPHY, MAGNETIZATION, PHYSICS
Abstract

Patterned Permalloy submicron-size structures have been fabricated by e-beam lithography in the shape of a ring with a tip. A tip was intentionally added into the ring as a geometrical defect to interrupt the continuity of the magnetization, which aligns along the ring, in order to pin the domain wall. Magnetic switching and reversal process have been measured by the magnetoresistance measurement. The switching field about 260 Oe was obtained. At the remanent state, there was a 0.21% difference in the magnetoresistance between the angles of 90° and 0° that was equivalent to the domain wall magnetoresistance. By applying an external field, the domain wall moved along the ring under a lower field (100 Oe), which is smaller than the switching field. A drop (0.24%) in the resistance between the angle of 70°–120° has been observed that means the domain wall was moving into the voltage measuring region during the rotation. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2004
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40. Synthesis and Antibacterial Evaluation of Certain Quinolone Derivatives

Author

Chen, Y.-L., Fang, K.-C., Sheu, J.-Y., Hsu, S.-L., and Tzeng, C.-C.

Abstract

A number of 7-substituted quinolone derivatives were synthesized and evaluated for antibacterial and cytotoxic activities. Preliminary results indicated that most compounds tested in this study demonstrated better activity against methicillin-resistant Staphylococcus aureus than norfloxacin. Among them, 1-(4-amino-2-fluorophenyl)-6-fluoro-1,4-dihydro-7-{4-[2-(4-methoxyphenyl)-2-hydroxyiminoethyl]-1-piperazinyl}-4-oxo-3-quinolinecarboxylic acid (11d) and its ketone precursor 10d exhibited significant activities against Klebsiella pneumoniae, methicillin-resistant S. aureus, erythromycin- and ampicillin-resistant Streptococcus pneumoniae, and vancomycin-resistant Enterococcus faecalis. Due to strong cytotoxicities of 11d (a mean log GI50 of −5.40), compound 10d, with good antibacterial activities and low cytotoxicities (a mean log GI50 of −4.67), is a more potential drug candidate.

Published
2001

42. Synthesis, Antibacterial, and Cytotoxic Evaluation of Certain 7-Substituted Norfloxacin Derivatives

Author

Fang, K.-C., Chen, Y.-L., Sheu, J.-Y., Wang, T.-C., and Tzeng, C.-C.

Abstract

We report herein the synthesis and biological evaluation of two series of 7-substituted norfloxacin derivatives. Most compounds tested in this study demonstrated better activity against methicillin-resistant Staphylococcus aureus than norfloxacin. Preliminary in vitro evaluation indicated that the 7-[4-(2-hydroxyiminoethyl)piperazin-1-yl] derivatives 3b−e possess distinct cytotoxicity profiles as compared with their α-methylene-γ-butyrolactone counterparts, 4b,e:  i.e., excellent activities against the renal cancer subpanel. Among them, 1-ethyl-6-fluoro-7-{4-[2-(4-chlorophenyl)-2-hydroxyiminoethyl]-1-piperazinyl}-4-oxo-1,4-dihydro-3-quinolinecarboxylic acid (3d) demonstrated the most significant activities against renal cancer cell lines, with log GI50 values of −6.40 against CAK-1, −6.14 against RXF 393, and −7.54 against UO-31, compared with a mean log GI50 value of −5.03.

Published
2000

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