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Evaluation of excavation damaged zones(EDZs)in Horonobe Underground Research Laboratory(URL)

Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 365-378页

作者： koji Hata Sumio Niunoya Kazuhei Aoyagi Nobukatsu Miyara obayashi Corporation Technology Research InstituteTechnology DivisionKiyoseTokyo204-8558Japan obayashi Corporation Nuclear Facilities DivisionSinagawaTokyo108-8502Japan Japan Atomic Energy Agency Horonobe Underground Research CenterHoronobeHokkaido098-3224Japan

Excavation of underground caverns,such as mountain tunnels and energy-storage caverns,may cause the damages to the surrounding rock as a result of the stress *** this influenced zone,new cracks and discontinuities are created or propagate in the rock ***,it is effective to measure and evaluate the acoustic emission(AE)events generated by the rocks,which is a small elastic vibration,and permeability *** authors have developed a long-term measurement device that incorporates an optical AE(O-AE)sensor,an optical pore pressure sensor,and an optical temperature sensor in a single multi-optical measurement probe(MOP).Japan Atomic Energy Agency has been conducting R&D activities to enhance the reliability of high-level radioactive waste(HLW)deep geological disposal *** a high-level radioactive disposal project,one of the challenges is the development of methods for long-term monitoring of rock mass ***,in January 2014,the long-term measurements of the hydro-mechanical behavior of the rock mass were launched using the developed MOP in the vicinity of 350 m below the surface at the Horonobe Underground Research *** measurement results show that AEs occur frequently up to 1.5 m from the wall during *** addition,hydraulic conductivity increased by 2e4 orders of *** analysis revealed that the hydraulic behavior of the rock mass affected the pore pressure fluctuations and caused *** on this,a conceptual model is developed to represent the excavation damaged zone(EDZ),which contributes to the safe geological disposal of radioactive waste.

关键词： Excavation damaged zone(EDZ) Optical sensor Long-term monitoring Acoustic emission(AE) Shaft sinking

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渗碳淬火钢的冲击断裂行为

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水钢科技 2021年第1期 53-62页

作者： Kazuaki OKADA koji obayashi Yoshikazu TODAKA Nozomu ADACHI 高长益(译) 叶雅妮(译) 张东升(译) 谢祥(译) 刘立德(译) 吴学林(译) 日本爱信株式会社日本丰桥工业大学首钢水钢制造管理部贵州六盘水553028

我们研究了超真空渗碳和感应淬火热处理后的渗碳淬火钢的夏比冲击值。本研究的目的在于探讨含有不同数量的残余奥氏体和渗碳体的钢的裂纹扩展行为与组织的关系。真空渗碳是在1.3 mass%C的过共析成分进行的。在Acm和A_(1)之间的奥氏体和... 详细信息

我们研究了超真空渗碳和感应淬火热处理后的渗碳淬火钢的夏比冲击值。本研究的目的在于探讨含有不同数量的残余奥氏体和渗碳体的钢的裂纹扩展行为与组织的关系。真空渗碳是在1.3 mass%C的过共析成分进行的。在Acm和A_(1)之间的奥氏体和渗碳体两相区内选择了三种不同的加热温度进行感应淬火,以获得不同数量的残余奥氏体和渗碳体。当感应加热温度从1143 K降低到1043 K时,无论是淬火态试样,还是淬火+回火态试样,其裂纹扩展抗力都提高约30%。在感应加热温度较低的情况下,未溶解θ的止裂作用使试样具有高的裂纹抗力。相比之下,在经过低温处理的试样中,无论感应加热温度高低,裂纹扩展抗力几乎为恒定值,这种恒定的裂纹扩展抗力归因于裂纹扩展过程中发生的反复弯曲和分支。

关键词：裂纹扩展止裂残余应力未溶解的渗碳体残余奥氏体夏比冲击值渗碳钢

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Streamline pair selection for comparative flow field visualization

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Visual Computing for Industry,Biomedicine,and Art 2020年第1期3卷 215-226页

作者： Shoko Sawada Takayuki Itoh Takashi Misaka Shigeru obayashi Tobias Czauderna Kingsley Stephens Ochanomizu University 2-1-1 OtsukaBunkyo-kuTokyo 1128610Japan Tohoku University 2-1-1 KatahiraAoba-kuSendaiMiyagi 9808577Japan Monash University Wellington RoadClaytonVictoriaAustralia

Fluid dynamics simulation is often repeated under varying *** leads to a generation of large amounts of results,which are difficult to *** compare results under different conditions,it is effective to overlap the streamlines generated from each condition in a single three-dimensional *** is a curved line,which represents a wind *** paper presents a technique to automatically select and visualize important streamlines that are suitable for the comparison of the simulation ***,we present an implementation to observe the flow fields in virtual reality spaces.

关键词： Computational fluid dynamics Streamline selection Comparative flow field visualization Virtual reality

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Pharmacy residency system in Gunma University Hospital

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Asian Journal of Pharmaceutical Sciences 2016年第1期11卷 215-216页

作者： Asami Matsushita Daisuke Nagano Mikako Shimone Kyoko obayashi Takuya Araki Koujirou Yamamoto Department of Pharmacy Gunma University Hospital3-39-15 Showa-machiMaebashi 371-8511Japan Department of Clinical Pharmacology Gunma University Graduate School of Medicine3-39-22 Showa-machiMaebashi 371-8511Japan

Recently,undergraduate and postgraduate pharmaceutical education systems have been changing greatly in *** 2006,undergraduate pharmacist program was changed from 4 years course to 6 years course to train higher-quality pharmacists who can deal with the changes in the progression of medical technology and meet social demands for medication safety[1].As a postgraduate training system,pharmacy residency system was started in several hospital in 2002,and around 35 hospitals have pharmacy residency system at 2015[2].

关键词： Pharmacy residency system Postgraduate pharmaceutical program Teaching program Japanese pharmacy

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Active Stall Control System on NACA0012 by Using Synthetic Jet Actuator

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Journal of Flow Control, Measurement & Visualization 2019年第1期7卷 61-72页

作者： Hiroaki Hasegawa Shigeru obayashi Department of Mechanical & Intelligent Engineering Utsunomiya University Utsunomiya Japan Institute of Fluid Science Tohoku University Sendai Japan

Flow separation is typically an undesirable phenomenon, and boundary layer control is an important technique for the separation problems on airfoils. The synthetic jet actuator is considered as a promising candidate for flow control applications because of its compact nature and ability to generate momentum without the need for fluidic plumbing. In the present study, an active separation control system using synthetic jets is proposed and practically applied to the stall control of the NACA0012 airfoil in a wind tunnel test. In our proposed system, the flow conditions (stalled or unstalled) can be judged by calculating from two static pressure holes on the airfoil upper surface alone. The experimental results indicate that the maximum lift coefficient increases by 11% and the stall angle rises by 4°in contrast to the case under no control. It is confirmed that our proposed system can suppress the stall on the NACA0012 airfoil and that the aerodynamic performance of the airfoil can be enhanced. The proposed system can also be operated prior to the onset of stall. Therefore, separation control is always attained with no stall for all flow fields produced by changing the angle of attack that were examined.

关键词： Active Control Airfoil Lift Separation Stall Synthetic Jet

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High-reliability zircon separation for hunting the oldest material on Earth： An automatic zircon separator with image-processing/microtweezers-manipulating system and double-step dating

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Geoscience Frontiers 2018年第4期9卷 1073-1083页

作者： Yukio Isozaki Shinji Yamamoto Shuhei Sakata Hideyuki obayashi Takafumi Hirata Ken-ichi Obori Toshinori Maebayashi Satoshi Takeshima Toshikazu Ebisuzaki Shigenori Maruyama Department of Earth Science and Astronomy The University of Tokyo Komaba Meguro Tokyo 153-8902 Japan Department of Human Environmental Studies Yokohama National University Hodogaya Yokohama 240-8501 Japan Department of Chemistry Gakushuin University Mejiro Toshima Tokyo 171-8588 Japan Department of Geology and Mineralogy Kyoto University Kitashirakawa Oiwakecho Sakyo-ku Kyoto 606-8502 Japan Geochemical Research Center The University of Tokyo Hongo 7-3-1 Bunkyo Tokyo 113-0033 Japan Horiba Ltd. Kanda Chiyoda Tokyo 101-0063 Japan MicroSupport Co. Ltd. Hiratsuka Kanagawa 254-0035 Japan Mitani Corporation Takada Toshima Tokyo 171-0033 Japan Riken Wako Saitama 351-0198 Japan ELSI Tokyo Institute of Technology Meguro Tokyo 152-8551 Japan

Despite the recent development in radiometric dating of numerous zircons by LA-ICPMS, mineral separation still remains a major obstacle, particularly in the search for the oldest material on Earth. To improve the efficiency in zircon separation by an order of magnitude, we have designed/developed a new machine-an automatic zircon separator（AZS）. This is designed particularly for automatic pick-up of100 μm-sized zircon grains out of a heavy mineral fraction after conventional separation procedures. The AZS operates in three modes：（1） image processing to choose targeted individual zircon grains out of all heavy minerals spread on a tray,（2） automatic capturing of the individual zircon grains with microtweezers, and（3） placing them one-by-one in a coordinated alignment on a receiving tray. The automatic capturing was designed/created for continuous mineral selecting without human presence for many hours. This software also enables the registration of each separated zircon grain for dating, by recording digital photo-image, optical（color） indices, and coordinates on a receiving tray. We developed two new approaches for the dating; i.e.（1） direct dating of zircons selected by LA-ICPMS without conventional resin-mounting/polishing,（2） high speed U-Pb dating, combined with conventional sample preparation procedures using the new equipment with multiple-ion counting detectors（LA-MIC-ICPMS）.With the first approach, Pb-Pb ages obtained from the surface of a mineral were crosschecked with the interior of the same grain after resin-mounting/polishing. With the second approach, the amount of time required for dating one zircon grain is ca. 20 s, and a sample throughput of 〉150 grains per hour can be achieved with sufficient precision（ca. 0.5%）.We tested the practical efficiency of the AZS, by analyzing an Archean Jack Hills conglomerate in Western Australia with the known oldest（〉4.3 Ga） zircon on Earth. Preliminary results are positive; we were able to obtain more than 194 zirc

关键词： Hadean Zircon U-Pb dating LA-ICPMS Automatic mineral separator Primordial crust

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Chronological constraints on the Paleoproterozoic Francevillian Group in Gabon

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Geoscience Frontiers 2017年第2期8卷 397-407页

作者： Yusuke Sawaki Mathieu Moussavou Tomohiko Sato Kazue Suzuki Cédric Ligna Hisashi Asanuma Shuhei Sakata Hideyuki obayashi Takafumi Hirata Amboise Edou-Minkoinko Department of Earth and Planetary Sciences Tokyo Institute of Technology2-12-1 O-okayamaMeguro-kuTokyo 152-8551Japan University of Sdences and Technology in Masuku BP:90190025 FrancevilleGabon Earth-Life Science Institute(ELSI) Tokyo Institute of Technology2-12-1 O-okayamaMeguro-kuTokyo 152-8551Japan Department of Chemistry Gakushuin UniversityMejiro 1-5-1Toshima-kuTokyo 171-8588Japan Division of Earth and Planetary Sciences Graduate School of ScienceKyoto UniversityKitashirakawa Oiwake-choSakyo-kuKyoto 606-8502Japan Geochemistry Research Center The University of TokyoHongo 7-3-1Bunkyo-kuTokyo 113-0033Japan

The Francevillian Group in Gabonese Republic was recently established as a typical sedimentary sequence for the ***,its age is rather poorly constrained,mainly based on Rb-Sr and Nd-Sm *** study reports new zircon data obtained from Chaillu massif and N＇goutou complex,which constrain the protolith age of the basement orthogneisses and the igneous age of an intrusive granite,*** zircons from the orthogneisses are blue and exhibit oscillatory zoning in cathode-luminescence *** with lower common lead abundances tend to be distributed close to the concordia *** age clusters around 2860 Ma and 2910 Ma are found in zircons plotted on the concordia *** on the Th/U ratios of zircons,these ages correspond to the protolith ages of the orthogneisses,and the zircons are not metamorphic in *** and granites were collected from the N＇goutou complex that intrudes into the FA and FB units of the Francevillian *** granitoids exhibit chemical composition of A-type granite *** of zircons separated from the granite are non-luminous,and the remaining half exhibit obscure internal textures under cathode-luminescence *** zircon grains contain significant amounts of common lead;the lead isotopic variability is probably attributed to the mixing of two components in the *** zircon radiogenic ^（207）Pb/^（206）Pb ratio is 0.13707 ± *** to a ^（207）Pb/^（206）Pb age of 2191 ± 13 *** constrains the minimum depositional age of the FA and FB ***,the FB unit consists of manganese-rich carbonate rocks and organic carbon-rich black shales with macroscopic *** on our age constraints,these organisms appeared in the study area just after the last Paleoproterozoic Snowball Earth event,in concert with global scale oxidation event encompassing the Snowball Earth.

关键词： Gabon Francevillian Group Paleoproterozoic N'goutou complex Zircon MC-ICP-MS

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Increased Cerebral Cortex Perfusion in Stroke Patients with Cognitive Disorder Following Cilostazol Administration, Two Cases Report

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Neuroscience & Medicine 2012年第4期3卷 357-361页

作者： Yukihiro Hara Shigeru obayashi Department of Rehabilitation Medicine Nippon Medical School Chiba Hokusoh Hospital Chiba Japan.

Objective: In our search for a new augmentation therapy for stroke patients, we administered cilostazol, an antiplatelet agent. Subjects: The patients suffered from mild hemiparesis or cognitive disorder showing reduced cerebral perfusion in the prefrontal cortex. Methods: We evaluated the functional cerebral blood flow (CBF) before and after the administration of cilostazol using near-infrared resonance spectroscopy (NIRS) during a verbal fluency task (VFT). Results: For the patient with cognitive disorder, statistically significant improvements were observed in the number of generated words in the VFT before and after administration of 50 mg cilostazol (p 0.05, Mann-Whitney U test). Another patient without cognitive disorder, however, showed no significant VFT improvement after administration of cilostazol. Effect size data revealed large or very large effects of cilostazol on brain activation (oxy-Hb levels) at the affected side prefrontal cortex for both patients. The patient with cognitive disorder showed significant improvement in VFT performance as well as an increase in bilateral prefrontal CBF after cilostazol administration. Discussion: These findings suggest that, for patients with cerebrovascular lesions suffering from cognitive disorder, cilostazol may be promising as a drug to improve cognitive function in addition to preventing recurrent cerebral infarction.

关键词： Stroke Cognitive Disorder Brain Perfusion Antiplatelet Drug NIRS

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Control of Karman Vortex Street behind a Thin Airfoil at Low Reynolds Number

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Journal of Flow Control, Measurement & Visualization 2016年第3期4卷 114-123页

作者： Shohei Takagi Yasufumi Konishi Shigeru obayashi Masato Asai Department of Aerospace Engineering Tokyo Metropolitan University Tokyo Japan Institute of Flow Science Tohoku University Sendai Japan

To control the Karman vortex street formed behind a thin airfoil at a certain incidence, a control cylinder was placed at the suction side apart from the airfoil in the downstream region. Both smoke visualization and hot-wire measurements confirmed that the Karman vortex street was completely suppressed. The mechanism for suppression of the vortex street was examined with a hot-wire survey.

关键词： Karman Vortex Street Vortex Suppresion Absolute Instability Convective Instability

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Significance of three step prescription checking by pharmacists

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Asian Journal of Pharmaceutical Sciences 2016年第1期11卷 213-214页

作者： Mikako Shimone Daisuke Nagano Asami Matsushita Junko Tsukamoto Yu Yanai Akiko Kaneta Kyoko obayashi Takuya Araki Koujirou Yamamoto Department of Pharmacy Gunma University Hospital3-39-15 Showa-machiMaebashi 371-8511Japan Department of Clinical Pharmacology Gunma University Graduate School of Medicine3-39-22 Showa-machiMaebashi 371-8511Japan

In many hospitals,prescription checks are conducted by 2 or 3 individual pharmacists at each step of prescription checking,dispensing,and final checking to maintain the safety and efficacy of pharmaceutical therapies in Japan[1,2].In Gunma University Hospital,we also check all prescriptions by 3 pharmacists at each step of dispensing(3 step prescription check system)with the exception of night *** this study,to assess the significance of our 3 step prescription check system for managing safety of pharmaceutical therapies,we investigated prescriptions that needed the confirmation of questionable points and prescription corrections.

关键词： Prescription checking Safe management Data analysis Questionable points to physicians

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