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758 results on '"Gan, B."'

151. Platinum-catalyzed Tandem Carboalkoxylation-Claisen Rearrangement of Arylalkynes Bearing anortho-1,5-Dihydro-3H-2,4-dioxepine Group

Author

Itaru Nakamura, Gan B. Bajracharya, and Yoshinori Yamamoto

Subjects
chemistry.chemical_classification, Bearing (mechanical), Tandem, chemistry.chemical_element, General Chemistry, Medicinal chemistry, law.invention, Catalysis, Claisen rearrangement, chemistry, law, Group (periodic table), Rearrangement reaction, Platinum, Tricyclic
Abstract

The platinum-catalyzed tandem carboalkoxylation-Claisen rearrangement reaction of arylalkynes 1 bearing an ortho-1,5-dihydro-3H-2,4-dioxepine group gave the corresponding tricyclic compounds 2 in g...

Published
2005
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167. Design of a Multi-Channel Low-Noise Readout ASIC for CdZnTe-Based X-Ray and \gamma -Ray Spectrum Analyzer.

Author

Gan, B., Wei, T., Gao, W., Zheng, R., and Hu, Y.

Subjects
*APPLICATION-specific integrated circuits, *CADMIUM zinc telluride detectors, *X-ray detection, *GAMMA ray detectors, *ELECTRONIC amplifiers, *SIGNAL-to-noise ratio, *CMOS amplifiers
Abstract

In this paper, we report on the recent development of a 32-channel low-noise front-end readout ASIC for cadmium zinc telluride (CdZnTe) X-ray and \gamma -ray detectors. Each readout channel includes a charge sensitive amplifier, a CR-RC shaping amplifier and an analog output buffer. The readout ASIC is implemented using TSMC 0.35 - \mu \m mixed-signal CMOS technology, the die size of the prototype chip is 2.2~\mm \times 4.8~\mm. At room temperature, the equivalent noise level of a typical channel reaches 133~\e^ - (rms) with the input parasitic capacitance of 0 pF for the average power consumption of 2.8 mW per channel. The linearity error is less than \pm 2\% and the input energy dynamic range of the readout ASIC is from 10 keV to 1 MeV. The crosstalk between the channels is less than 0.4%. By connecting the readout ASIC to a CdZnTe detector, we obtained a \gamma -ray spectrum, the energy resolution is 1.8% at the 662-keV line of ^137Cs source. [ABSTRACT FROM AUTHOR]

Published
2015
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168. Penis fencing, spawning, parental care and embryonic development in the cotylean flatworm Pseudoceros indicus (Platyhelminthes: Polycladida: Pseudocerotidae) from Singapore.

Author

Chim, C. K., Ong, Rene S. L., and Gan, B. Q.

Subjects
SPAWNING, EMBRYOLOGY, OVIPARITY, PLATYHELMINTHES, MARINE invertebrates, REPRODUCTION, BEHAVIOR
Abstract

The reproductive behaviour of a pair of Pseudoceros indicus from Singapore was observed in the laboratory. Pre-copulatory behaviour included penis fencing, i.e., using their extensively everted penis to stab each other on any part of the body while avoiding being inseminated. However, successful injection resulted in the transfer of sperm in the form of a white spermatophore on the dorsal and/or ventral side of the flatworm. Most of the time, both flatworms received sperm after each bout of penis fencing. The sperm bundles spread across the body as white streaks and were absorbed within a day. After 18 days following at least six insemination occasions, oviposition occurred. The resulting irregularly shaped egg plate consisted of a single layer of eggs tightly packed together. One of the flatworms laid seven batches of eggs over 50 days while another individual laid four batches over 52 days. For both individuals, new egg batches were always added next to old ones, except for their respective last batches, which were deposited on top of the old ones. Reproductive outputs of the two flatworms were 1,307 eggs and 3,073 eggs, respectively. The adults exhibited parental care by covering the egg plates with their bodies until hatching, with decreasing levels of intensity and frequency over time. Eight-lobed Müller's larvae hatched 27 days after oviposition. Each larva measured 282 × 197 μm in size and possessed three eye spots. [ABSTRACT FROM AUTHOR]

Published
2015

192. Catalytic Cyclization of o-Alkynylbenzaldehyde Acetals and Thioacetals. Unprecedented Activation of the Platinum Catalyst by Olefins. Scope and Mechanism of the Reaction [J. Am. Chem. Soc. 2004, 126, 15423−15430]

Author

Yoshinori Yamamoto, Gan B. Bajracharya, Yuya Mizushima, Huanyou Wu, Itaru Nakamura, and Ilya D. Gridnev, and Kengo Oishi

Subjects
Colloid and Surface Chemistry, Scope (project management), Chemistry, Platinum catalyst, Organic chemistry, General Chemistry, Biochemistry, Catalysis, Mechanism (sociology)
Published
2005
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198. CHARACTERISTICS OF CVD DIAMOND FILMS IN DETECTING UV, X-RAY AND ALPHA PARTICLE

Author

AHN, J., primary, GAN, B., additional, ZHANG, Q., additional, YOON, S. F., additional, LIGATCHEV, V., additional, WANG, S.-G., additional, HUANG, Q.-F., additional, CHEW, K., additional, PATRAN, A.-C., additional, SERBAN, A., additional, LIU, M.-H., additional, LEE, S., additional, BETTIOL, A. A., additional, OSIPOWICZ, T., additional, and WATT, F., additional

Published
2002
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