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2 results on '"Asami Hayato"'

1. Development of the GEM-TPC X-ray Polarimeter with the Scalable Readout System.

Author

Takao Kitaguchi, Asami Hayato, Wataru Iwakiri, Yoko Takeuchi, Megu Kubota, Kazuki Nishida, Teruaki Enoto, and Toru Tamagawa

Subjects
*TIME projection chambers (Nuclear physics), *POLARISCOPE, *SYNCHROTRON radiation, *GAS detectors, *PHOTOELECTRONS
Abstract

We have developed a gaseous Time Projection Chamber (TPC) containing a single-layered foil of a gas electron multiplier (GEM) to open up a new window on cosmic X-ray polarimetry in the 2-10 keV band. The micro-pattern TPC polarimeter in combination with the Scalable Readout System produced by the RD51 collaboration has been built as an engineering model to optimize detector parameters and improve polarimeter sensitivity. The polarimeter was characterized with unpolarized X-rays from an X-ray generator in a laboratory and polarized X-rays on the BL32B2 beamline at the SPring-8 synchrotron radiation facility. Preliminary results show that the polarimeter has a comparable modulation factor to a prototype of the flight one. [ABSTRACT FROM AUTHOR]

Published
2018
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2. Preparation of isospecific metallocene catalysts for olefin polymerization that are covalently tethered on solid surface

Author

Suzuki, Noriyuki, Yu, Jian, Shioda, Nobuyuki, Asami, Hayato, Nakamura, Takashi, Huhn, Thomas, Fukuoka, Atsushi, Ichikawa, Masaru, Saburi, Masahiko, and Wakatsuki, Yasuo

Subjects
*ALKENES, *METALLOCENES
Abstract

Novel methodology was developed for preparation of isospecific metallocene catalysts for olefin polymerization that are tethered on silica surfaces with covalent bonds. A racemic ansa-zirconocene complex that has a Si–Cl moiety on its bridge was immobilized on SiO2 by the reaction of the Si–Cl anchor with Si–OH on the solid surface. The prepared solid catalyst was found to be effective for isospecific propene polymerization (catalyst A). Pretreatment of silica surfaces with Me3SiCl improved the catalyst performance (catalyst B). An ansa-zirconocene complex with a BH group reacted with “vinyl-coated” silica gel to afford another immobilized catalysts (catalyst C). This catalyst achieved satisfactorily high catalytic activity and high isotacticity in its produced polypropene. [Copyright &y& Elsevier]

Published
2002
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