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2004无线电科学国际会议

作者： Mamoru Sekido Ryuichi Ichikawa Hiro Osaki Tetsuro Kondo yasuhiro koyama Makoto Yoshikawa Takafumi Ohnishi Wayne Cannon Alexander Novikov Mario Berube National Institute of Information and Communications Technology Kashima Space Research Center 893-1 Hirai Kashima Ibaraki 314-8501 Japan National Institute of Information and Communications Technology Kashima Space Research Center 893-1 Hirai Kashima Ibaraki 314-8501 Japan National Institute of Information and Communications Technology Kashima Space Research Center 893-1 Hirai Kashima Ibaraki 314-8501 Japan National Institute of Information and Communications Technology Kashima Space Research Center 893-1 Hirai Kashima Ibaraki 314-8501 Japan National Institute of Information and Communications Technology Kashima Space Research Center 893-1 Hirai Kashima Ibaraki 314-8501 Japan Institute of Space and Astronautical Sciences/JAXA 3-1-1 Yoshinodai Sagamihara Kanagawa 229-8510 Japan Advanced Science Solutions Group/Fujitsu Limited. 4-1-1 Kamikodanaka Nakahara-ku Kawasaki Kanagawa 211-8588 Japan Space Geodynamics Laboratory Department of Physics and Astronomy York University 4700 Keele Street Toronto Ontario M3J 1P3 Canada Space Geodynamics Laboratory Department of Physics and Astronomy York University 4700 Keele Street Toronto Ontario M3J 1P3 Canada Geodetic Survey Division/Natural Resources Canada 615 Booth Street Room 440 Ottawa OntarioK1A 0E9 Canada.

A series of VLBI observations for spacecraft NOZOMI was performed in the period between the end of 2002 and July 2003 with aim of supporting the orbit determi- nation. We have made astrometric anal

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Evaluation of revascularization after total arch replacement in common carotid artery occlusion

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World Journal of Clinical Cases 2018年第1期6卷 6-10页

作者： yasuhiro Matsuda Tadaaki koyama Department of Cardiovascular Surgery Kobe City Medical Center General Hospital

Occlusion of the common carotid artery(CCA) is rare. CCA occlusion(CCAO) can present as drowsiness and right hemiplegia related to emboli after total arch replacement. Although we selected a follow-up at first because color duplex sonography showed retrograde flow from the left external carotid artery to the internal carotid artery, this patient had epilepsy and single-photon emission computed tomography(SPECT) acquired quantitative results of actual brain perfusion and showed insufficient collateral blood flow. To improve brain perfusion, we performed a bypass of the left subclavian artery to left CCA bypass. Postoperatively, the patient did not have epilepsy and drowsiness. Also, right hemiplegia improved enough for him to walk with support. SPECT showed increased left cerebral flow(the asymmetry ratio was 71% to 81%). Evaluation of the carotid artery with color duplex sonography alone was insufficient when CCAO showed retrograde or collateral flow. We should have performed quantitative evaluation with SPECT at the same time.

关键词： Color duplex sonography Common carotid artery occlusion Revascularization Single-photon emission computed tomography Total arch replacement

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InAsSb thick epilayers applied to long wavelength photoconductors

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International Journal of Minerals,Metallurgy and Materials 2013年第4期20卷 393-396页

作者： Yu-zhu Gao Xiu-ying Gong Guang-hui Wu Yan-bin Feng Takamitsu Makino Hirofumi Kan Tadanobu koyama yasuhiro Hayakawa School of Electronics and Information Engineering Tongji University Huaxing Infrared Device Co. Hamamatsu Photonics K.K. Research Institute of Electronics Shizuoka University

InAs0.052Sb0.948 epilayers with cutoff wavelengths longer than 8 μm were successfully grown on InAs substrates using melt epitaxy （ME）. Scanning electron microscopy observations show that the interface between the epilayers and substrates is flat, indicating the good quality of the epilayers, and the thickness of the epilayers is 40 μm. Photoconductors were fabricated using InAs0.052Sb0.948 thick epilayers grown by ME. Ge optical lenses were set on the photoconductors. At room temperature, the photoresponse wavelength range was 2-10μm. The peak detectivity Dλp reached 5.4 × 10^9 cm-Hz^1/2.W^-1 for the immersed detectors. The detectivity D^＊ was 9.3 × 10^8 and 1.3 × 10^8 ***^1/2.W^-1 at the wavelength of 8 and 9 μm, respectively. The good performance of the uncooled InAsSb detectors was experimentally validated.

关键词： semiconducting indium compounds thick epilayers long wavelength photoconductors detectivity

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