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Successful endovascular treatment of endoscopically unmanageable hemorrhage from a duodenal ulcer fed by a renal artery: A case report

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World Journal of Clinical Cases 2018年第15期6卷 1012-1017页

作者： shimpei anami Hiroki Minamiguchi Naoaki Shibata Takao Koyama Hirotatsu Sato Akira Ikoma Motoki Nakai Takuji Yamagami Tetsuo Sonomura Department of Radiology Wakayama Medical University Department of Radiology Kochi Medical School Kochi University Department of Emergency and Critical Care Medicine Wakayama Medical University

A 52-year-old woman was admitted with hypovolemic shock. Emergency endoscopy revealed three hemorrhagic duodenal ulcers(all stage A1) with exposed vessels. Two ulcers were successfully treated by endoscopic clipping; however, the remaining ulcer on the posterior wall of the horizontal portion of the duodenum could not be clipped. Because her vital signs were rapidly worsening, we performed transcatheter arterial embolization(TAE) as it is less invasive than surgery. Computed tomography aortography showed that the duodenal hemorrhage was sourced from the lower branch of the right renal artery. In general, the duodenum is fed by branches from the gastroduodenal artery or superior mesenteric artery. However, this patient had three right renal arteries. The lower branch of the right renal artery at the L3 vertebral level was at the same level as the horizontal portion of the duodenum. Complete hemostasis was achieved by TAE using metallic coils and n-butyl-2-cyanoacrylate. After TAE, she recovered from the hypovolemic shock and was discharged from hospital. She has had no recurrence of the hemorrhagic duodenal ulcer for over 1 yr, and followup endoscopy showed no necrosis or stricture of the duodenum. Although she developed a small infarct of her right kidney, her renal function was satisfactory. In summary, the present case is the first reported case of hemorrhagic duodenal ulcer in which the culprit vessel was a renal artery that was successfully treated by TAE. Computed tomography aortography before TAE provides valuable information regarding the source of a duodenal hemorrhage.

关键词： Transcatheter arterial embolization Metallic coils N-butyl-2-cyanoacrylate Renal artery Emergency radiology Case report Duodenal ulcer

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Development of Compressor for Ultra Micro Gas Turbine

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Journal of Thermal Science 2007年第1期16卷 19-27页

作者： shimpei MIZUKI Faculty of Engineering Department of Mechanical EngineeringHosei UniversityJapan

The major problems for the development of an ultra micro gas turbine system were discussed briefly from the stand point of the internal flow and the performance characteristics. Following to these, the development of ultra micro centrifugal compression systems for the ultra micro gas turbine is explained with the design and the manufacturing processes. The measured results of ultra micro centrifugal compressors are shown.

关键词： ultra micro gas turbine ultra micro centrifugal compressor

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The Gauss maps of Demoulin surfaces with conformal coordinates

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Science China Mathematics 2021年第7期64卷 1479-1492页

作者： Jun-ichi Inoguchi shimpei Kobayashi Institute of Mathematics University of TsukubaTsukuba 305-8571Japan Department of Mathematics Hokkaido UniversitySapporo 060-0810Japan

Demoulin surfaces in the real projective 3-space are investigated. Our result enables us to establish a generalized Weierstrass type representation for definite Demoulin surfaces by virtue of primitive maps into a cer... 详细信息

关键词： Demoulin surface Wilczynski frame Gauss map

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Investigation of Surge Behavior in a Micro Centrifugal Compressor

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Journal of Thermal Science 2006年第2期15卷 97-102页

作者： shimpei MIZUKI Yuichiro ASAGA Yushi ONO Hoshio TSUJITA Department of Mechanical Engineering Hosei University 3-7-2Kajino-choKoganei-shiTokyo Mitsubishi Heavy Industries Ltd. 1-1 Akunoura-machi Nagasaki-shi Nagasaki Department of Mechanical Engineering Hosei University 3-7-2 Kajino-cho Koganei-shi Tokyo

This paper reports the experimental and theoretical study of the surge occurred in prototyping an ultra micro centrifugal compressor. As the first step, the 10 times size model of an ultra micro centrifugal compressor having the 40 mm outer diameter was designed and manufactured. The detailed experimental investigations for the transient behavior of surge with several different values of B parameter were carded out. The experimental results during the surge were compared with those obtained by the non-linear lumped parameter theory in order to validate the effectiveness of the theoretical surge model for the micro centrifugal compressor. As a result, the quite different behavior of the surge appeared for the different values of B both in the experiment and in the analysis.

关键词： micro centrifugal compressor surge lumped parameter model

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Surge Control of a Centrifugal Compression System by Using a Bouncing Ball

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Journal of Thermal Science 2008年第2期17卷 141-146页

作者： Yuichiro Asaga shimpei Mizuki Hoshio Tsujita Shinsuke Ohta Department of Mechanical Engineering Faculty of EngineeringHosei University Mitsubishi Heavy Industries Ltd.

The purpose of this study is to suppress the fluctuations of surge by a simple passive control method. A bouncing ball system with different weight of the balls was tested. As a result, the bouncing ball system suppressed mild surge without the deterioration of the performance characteristics, and moved the initiation point of surge toward the lower flow rate when the steel ball of 15mm outer diameter was used. The present system was effective to suppress the surge and to widen the stable operating range of a centrifugal compressor when the ball was chosen appropriately.

关键词： centrifugal compressor surge passive control bouncing ball

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Topological phases and edge modes of an uneven ladder

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Chinese Physics B 2024年第8期33卷 154-168页

作者：商文创韩熠宁 shimpei Endo 高超 Department of Physics Zhejiang Normal UniversityJinhua 321004China Key Laboratory of Optical Information Detection and Display Technology of Zhejiang Zhejiang Normal UniversityJinhua 321004China Department of Engineering Science The University of Electro-CommunicationsTokyo 182-8585Japan

We investigate the topological properties of a two-chain quantum ladder with uneven legs,i.e.,the two chains differ in their periods by a factor of *** an uneven ladder presents rich band structures classified by the closure of either direct or indirect *** also provides opportunities to explore fundamental concepts concerning band topology and edge modes,including the difference of intracellular and intercellular Zak phases,and the role of the inversion symmetry(IS).We calculate the Zak phases of the two kinds and find excellent agreement with the dipole moment and extra charge *** also find that configurations with IS feature a pair of degenerate two-side edge modes emerging as the closure of the direct bandgap,while configurations without IS feature one-side edge modes emerging as not only the closure of both direct and indirect bandgaps but also within the band ***,by projecting to the two sublattices,we find that the effective Bloch Hamiltonian corresponds to that of a generalized Su–Schrieffer–Heeger model or the Rice–Mele model whose hopping amplitudes depend on the *** this way,the topological phases can be efficiently extracted through winding *** propose that uneven ladders can be realized by spin-dependent optical lattices and their rich topological characteristics can be examined by near future experiments.

关键词： ladder model symmetry-protected topological phase topological invariant bulk-boundary correspondence

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Numerical Investigation of Loss Generation Mechanisms of Flow in Turbomachinery by Using Curved Square Duct

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Journal of Thermal Science 2003年第3期12卷 219-224页

作者： Hoshio Tsujita shimpei Mizuki Gaku Minorikawa Atsumasa Yamamoto Department of Mechhanical Engineering Hosei University3-7-2 Kajino-choKoganeiTokyoJapanDepartment of Mechhanical EngineeringHosei University3-7-2 Kajino-choKoganeiTokyoJapanDepartment of Mechhanical EngineeringHosei University3-7-2 Kajino-choKoganeiTokyoJapanNational Aerospace Laboratory 7-44-1 Jindaiji-higashi-machi Chofu Tokyo Japan

The secondary flow within a passage of turbomachinery exhibits a complex flow pattern by the effect of the centrifugal and the Coriolis forces. The passage vortex in this secondary flow generates a major part of the losses. However, the mechanism of the loss generation has not been fully clarified yet. In this point of view, the passage vortex is closely examined by the computational method using the two-dimensional curved square ducts as fundamental models. The inlet boundary layer thickness and the inlet velocity distortion are considered to be the major parameters affecting the generation of passage vortex in the present study. The computed results revealed that the passage vortex gave the predominant effects for the generation of loss not only in the breakdown process but also in the development process.

关键词： curved duct turbomachinery secondary flow passage vortex loss generation

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Design and Prototyping of Micro Centrifugal Compressor

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Journal of Thermal Science 2003年第1期12卷 33-37页

作者： shimpei Mizuki Gaku Minorikawa Toshiyuki Hirano Yuichiro Asaga Naoki Yamaguchi Yutaka Ohta Eisuke Outa 1. Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Hosei University 7-2Department of Mechanical Engineering Waseda University 4-1Department of Mechanical Engineering Waseda University 4-1 Department of Mechanical Engineering Hosei University 7-2 Kajinocho 3 chome Koganei-shi Tokyo 184-8584JapanKajinocho 3 chome Koganei-shi Tokyo 184-8584JapanKajinocho 3 chome Koganei-shi Tokyo 184-8584Japan Kajinocho 3 chome Koganei-shi Tokyo 184-8584JapanKajinocho 3 chome Koganei-shi Tokyo 184-8584Japan Ohkubo 3 chome Shinjuku-ku Tokyo 169-8555JapanOhkubo 3 chome Shinjuku-ku Tokyo 169-8555Japan

In order to establish the design methodology of ultra micro centrifugal compressor,wich is the most important component of ultra micro gas turbine unit,a 10 times of the final target size model was designed,prototyped and *** problems to be solved for downsizing were examined and 2-dimensional impeller was chosen as the first model due to its *** conventional 1D prediction *** and the inverse design were *** prototyped compressor was driven by using a turbocharger and the performance characteristics were measured.

关键词：离心式压缩机设计性能

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Design and Prototyping of Micro Centrifugal Compressor for Ultra Micro Gas Turbine

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Journal of Thermal Science 2005年第4期14卷 308-313页

作者： shimpei MIZUKI Toshiyuki HIRANO Yoshiyuki KOIZUMI Gaku MINORIKAWA Hoshio TSUJITA Mitsuo IWAHARA Ronglei GU Yutaka OHTA Eisuke OUTA Department of Mechanical Engineering Hosei University Japan Graduate School of Engineering Mechanical Engineering Hosei University 7-2 Kajinocho 3 chomeKoganei-shi Tokyo 184-8584 Japan Department of Mechanical Engineering Waseda University

In order to establish the design methodology of an ultra micro centrifugal compressor, which is the most important component of an ultra micro gas turbine unit, a 10 times size of the final target compressor （impeller outer diameter 40 mm, corrected rotational speed 220,000 r/min） was designed. The problems to be solved for downsizing were examined and a 2-dimensional impeller was chosen as the first model due to its productivity. The conventional 1D prediction method and CFD were used. The prototyped compressor was tested by using cold air at the reduced speed of 110,000 r/min. Following to the 10 times model, a 5 times size of the final target model having fully 3-dimensional shape （impeller outer diameter 20mm, corrected rotational speed 500,000 r/min） was designed and tested by using hot gas at the reduced speed of 250,000 r/min.

关键词： centrifugal compressor performance characteristics 3-dimensional impeller.

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Effects of elevated [CO_2] on stem and root lodging among rice cultivars

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Chinese Science Bulletin 2013年第15期58卷 1787-1794页

作者： ZHU ChunWu CHENG WeiGuo SAKAI Hidemitsu OIKAWA shimpei LAZA Rebecca C USUI Yasuhiro HASEGAWA Toshihiro National Institute for Agro-Environmental Sciences Ibaraki 305-8604Japan Faculty of Agriculture Yamagata UniversityYamagata 997-8555Japan Faculty of International Agriculture and Food Studies Tokyo University of AgricultureTokyo 156-8502Japan Crop and Environmental Sciences Division International Rice Research InstituteDAPO Box 7777Metro ManilaPhilippines

Studies showed that elevated [CO2] would improve photosynthetic rates and enhance yields of rice;however,few studies have focused on the response of rice lodging,which is a major cause of cereal yield loss and quality reduction,under elevated [CO2].In this study,we examined the effects of elevated [CO2] on stem and root lodging using 4 rice cultivars(86Y8,japonica hybrid;LYP9,2-line indica hybrid;variety 9311,type of indica inbred rice,and SY63,3-line indica hybrid) grown under two [CO2] levels:400 and 680 μmol *** results indicated that under elevated [CO2],the stem-lodging risk(SLR) of 9311 decreased,while in SY63 the SLR increased,86Y8 and LYP9 were not significantly affected;the risk of root lodging was reduced for all cultivars,because root biomass(instead of root number) and bending strength were increased significantly,and then the increase of anti-lodging ability is far higher than that of self-weight mass moment for all *** findings suggested that higher [CO2] can enhance the risk of stem-lodging for cultivars with strong-[CO2]-responses,but may not aggravate the root lodging for all rice cultivars.

关键词： CO2浓度升高倒伏水稻品种间种茎二氧化碳浓度升高水稻品种杂交粳稻两优培九

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