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Journal of Mountain Science 2008年第4期5卷 279-298页

作者： Ganesh Raj JOSHI Daigoro hayashi Simulation Tectonics Laboratory Faculty of ScienceUniversity of the RyukyusOkinawa 903-0213Japan

This paper presents finite element modeling （FEM） to simulate the present-day stress field and crustal deformation using NE-SW structural section in the central Seismic Gap region of the Garhwal Himalaya. Our study deals with the effect of geometrical characteristics and rock layer parameters on the upper crust. Modeling results show that two types of tectonic regimes developed in the central Seismic Gap region： the geotectonics of the northern part has been controlled by regional compression, whereas southern part is characterized by regional extension. Correspondingly, thrust faults are induced in the northern part and normal faults are extensively developed in the southern front. Those evidences noticeably indicate that the compressive tectonic environment of the Himalaya becomes change into the extensional tectonic regime in its front. The computed shear stress accumulation along the northern fiat of Main Himalayan Thrust （MHT） implies that considerable amount of interseismic stress is building up along the MHT system in the Himalaya, which ultimately release through the possible future great Himalayan earthquake （M 〉 8）. The comparison between our modeled stress field, faulting pattern and horizontal shortening rate with the distribution of the microseismic events, focal mechanism solutions, active faulting and GPS data in the central Seismic Gap region shows good agreement.

关键词： Neotectonic deformation stress distribution FE modeling central Seismic Gap NW-Himalaya

Modeling the Contemporary Stress Field and Deformation Pattern of Eastern Mediterranean

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Journal of Earth Science 2010年第4期21卷 365-381页

作者： S K Dwivedi D hayashi Simulation Tectonics Laboratory Faculty of ScienceUniversity of the Ryukyus

The contemporary stress field in the earth＇s crust is important and provides insights into mechanisms that drive plate motions. In this study, elastic plane stress finite element modeling incorporating realistic rock parameters was used to calculate the stress field, displacement field, and defor- mation of the plate interactions in the eastern Mediterranean. Modeled stress data for the African- Arabian-Anatolian plate interactions with fixed European platform correlate well with observed contemporary stress indicator from the world stress map （WSM） and focal mechanism of earthquakes; while displacement field agrees qualitatively well with GPS vectors and sense of motion indicated by focal mechanisms for large crustal earthquakes （Ms〉6） and plate motion models. Modeling result shows the direction of maximum horizontal compressive stress （σHmax） toward the direction of absolute motion of these plates. Large perturbations in σHmax orientations are shown to occur in and around tectonic boundaries between those plates. It is observed that, although the African plate acts mostly as indenter, which transmits the collisional motion from the Arabian plate to the Anatolian plate, in the current situation, the far-field stress, probably from the subduction in Aegean Arc, is needed to satisfy the contemporary stress field in Anatolia.

关键词： finite element model maximum horizontal stress seismieity crustal deformation Anatolia eastern Mediterranean.

Fault Type Analysis along the San Andreas Fault Zone: A Numerical Approach

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Journal of Mountain Science 2010年第1期7卷 36-44页

作者： Matrika Prasad KOIRALA Daigoro hayashi Simulation Tectonics Laboratory Faculty of Science University of the Ryukyus

Finite Element (FE) modeling under plane stress condition is used to analyze the fault type variation with depth along and around the San Andreas Fault (SAF) zone. In this simulation elastic rheology was used and was thought justifiable as the variation in depth from 0.5 km to 20 km was considered. Series of calculations were performed with the variation in domain properties. Three types of models were created based on simple geological map of California, namely, 1) single domain model considering whole California as one homogeneous domain, 2) three domains model including the North American plate, Pacific plate, and SAF zone as separate domains, and 3) Four domains model including the three above plus the Garlock Fault zone. Mohr-Coulomb failure criterion and Byerlee's law were used for the calculation of failure state. All the models were driven by displacement boundary condition imposing the fixed North American plate and Pacific plate motion along N34°W vector up to the northern terminus of SAF and N50°E vector motion for the subducting the Gorda and Juan de Fuca plates. Our simulated results revealed that as the depth increased, the fault types were generally normal, and at shallow depth greater strike slip and some thrust faults were formed. It is concluded that SAF may be terminated as normal fault at depth although the surface expression is clearly strike slip.

关键词： Finite Element modeling plane stress fault type analysis San Andreas Fault zone rockdomain properties failure analysis

Transileocolic endovascular treatment by a hybrid approach for severe acute portal vein thrombosis with bowel necrosis:Two case reports

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World Journal of Clinical Cases 2022年第6期10卷 1876-1882页

作者： Sayaka Shirai Tatsuo Ueda Fumie Sugihara Daisuke Yasui Hidemasa Saito Hiroyasu Furuki Shiei Kim Hiroshi Yoshida Shoji Yokobori Hiromitsu hayashi shin-ichiro Kumita Department of Radiology Nippon Medical School HospitalBunkyo-ku 113-8603TokyoJapan Department of Radiology Nippon Medical School Musashi Kosugi HospitalKawasaki-shi 211-8533KanagawaJapan Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery Nippon Medical School Tamanagayama HospitalTama-shi 206-8512TokyoJapan Department of Emergency and Critical Care Medicine Nippon Medical School HospitalBunkyo-ku 113-8603TokyoJapan Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery Nippon Medical School HospitalBunkyo-ku 113-8603TokyoJapan

BACKGROUND Acute portal vein thrombosis(PVT)with bowel necrosis is a fatal condition with a 50%-75%mortality *** report describes the successful endovascular treatment(EVT)of two patients with severe *** SUMMARY The first patient was a 22-year-old man who presented with abdominal pain lasting 3 *** second patient was a 48-year-old man who presented with acute abdominal *** contrast-enhanced computed tomography,both patients were diagnosed with massive PVT extending to the splenic and superior mesenteric *** treatment(simultaneous necrotic bowel resection and EVT)was performed in a hybrid operating room(OR).EVTs,including aspiration thrombectomy,catheter-directed thrombolysis(CDT),and continuous CDT,were performed via the ileocolic vein under *** portal veins were patent 4 and 6 mo posttreatment in the 22-year-old and 48-year-old patients,*** Hybrid necrotic bowel resection and transileocolic EVT performed in a hybrid OR is effective and safe.

关键词： Bowel necrosis Endovascular treatment Hybrid operating room Hybrid treatment Portal vein thrombosis Transileocolic approach Case report

Automatic Generation of 3D Building Models with Multiple Roofs

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Tsinghua Science and Technology 2008年第S1期13卷 368-374页

作者： Kenichi Sugihara Yoshitugu hayashi Faculty of Information Media Gifu Keizai University Graduate School of Environmental Studies Nagoya University

Based on building footprints (building polygons) on digital maps, we are proposing the GIS and CG integrated system that automatically generates 3D building models with multiple roofs. Most building polygons’ edges meet at right angles (orthogonal polygon). The integrated system partitions orthogonal building polygons into a set of rectangles and places rectangular roofs and box-shaped building bodies on these rectangles. In order to partition an orthogonal polygon, we proposed a useful polygon expression in deciding from which vertex a dividing line is drawn. In this paper, we propose a new scheme for partitioning building polygons and show the process of creating 3D roof models.

关键词： 3D building model 3D urban model automatic generation CG GIS polygon partitioning

Novel therapeutic approaches targeting L-type amino acid transporters for cancer treatment

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World Journal of Gastrointestinal Oncology 2017年第1期9卷 21-29页

作者： Keitaro hayashi Naohiko Anzai Department of Pharmacology and Toxicology Dokkyo Medical University School of Medicine Department of Pharmacology Chiba University Graduate School of Medicine

L-type amino acid transporters(LATs) mainly assist the uptake of neutral amino acids into cells. Four LATs(LAT1, LAT2, LAT3 and LAT4) have so far been identified. LAT1(SLC7A5) has been attracting much attention in the field of cancer research since it is commonly up-regulated in various cancers. Basic research has made it increasingly clear that LAT1 plays a predominant role in malignancy. The functional significance of LAT1 in cancer and the potential therapeutic application of the features of LAT1 to cancer management are described in this review.

关键词： LAT1 Amino acid transporter Molecular target drug Amino acid starvation response Signal transduction

Asymptotics for the Korteweg-de Vries-Burgers Equation

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Acta Mathematica Sinica,English Series 2006年第5期22卷 1441-1456页

作者： Nakao hayashi Pavel I.NAUMKIN Department of Mathematics Graduate School of ScienceOsaka UniversityOsakaToyonaka560-0043Japan Instituto de Matemáticas UNAM Campus MoreliaAP 61-3(Xangari)Morelia CP 58089MichoacánMexico

We study large time asymptotics of solutions to the Korteweg-de Vries-Burgers equation ut＋uux-uxx＋uxxx=0,x∈R,t〉0. We are interested in the large time asymptotics for the case when the initial data have an arbitrary size. We prove that if the initial data u0 ∈H^s （R）∩L^1 （R）, where s 〉 -1/2, then there exists a unique solution u （t, x） ∈C^∞ （（0,∞）;H^∞ （R）） to the Cauchy problem for the Korteweg-de Vries-Burgers equation, which has asymptotics u（t）=t^-1/2fM（（·）t^-1/2）＋0（t^-1/2） as t →∞, where fM is the self-similar solution for the Burgers equation. Moreover if xu0 （x） ∈ L^1 （R）, then the asymptotics are true u（t）=t^-1/2fM（（·）t^-1/2）＋O（t^-1/2-γ） where γ ∈ （0, 1/2）.

关键词： Korteweg-de Vries-Burgers equation asymptotics for large time large initial data

Ansa pancreatica as a predisposing factor for recurrent acute pancreatitis

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World Journal of Gastroenterology 2016年第40期22卷 8940-8948页

作者： Takana Yamakawa hayashi Wataru Gonoi Takeharu Yoshikawa Naoto hayashi Kuni Ohtomo Department of Radiology Graduate School of Medicine The University of Tokyo Department of Computational Diagnostic Radiology and Preventive Medicine The University of Tokyo

AIM To determine the non-biased prevalence and clinical significance of ansa pancreatica in patients with acute pancreatitis using magnetic resonance imaging(MRI).METHODS Our institutional review board approved this crosssectional study, which consisted of a community-based cohort of 587 consecutive participants in a whole-body health-check program, and 73 subjects with episode of acute pancreatitis(55 patients with a single episode of acute pancreatitis, and 18 patients with recurrent acute pancreatitis). All of the subjects underwent abdominal MRI including magnetic resonance cholangiopancreatography, medical examinations, and blood tests. Two board-certified, diagnostic, abdominal radiologists evaluated the images, and ansa pancreatica was diagnosed based on its characteristic anatomy on *** Compared with the community group [5/587(0.85%)], patients with recurrent acute pancreatitis had a significantly higher frequency of ansa pancreatica [2/18(11.1%)](P = 0.016; OR = 14.3; 95%CI: 1.27-96.1), but not compared with patients with single-episode acute pancreatitis [1/55(1.8%)](P = 0.42; OR = 2.1; 95%CI: 0.44-19.7). Multiple logistic regression analysis using age, alcohol intake, presence of ansa pancreatica, and presence of autoimmune disease as independent covariates, revealed a significant relationship between the presence of ansa pancreatica and recurrent acute pancreatitis. The presence of autoimmune disease was also significantly associated with the onset of recurrent acute pancreatitis. On the other hand, neither age nor alcohol intake were significantly related to the onset of recurrent acute *** The present study is the first to provide robust evidence that the presence of ansa pancreatica is significantly associated with recurrent acute pancreatitis.

关键词： Anatomy Cholangiopancreatography Pancreatitis Magnetic resonance imaging Pancreatic duct

Influence of texture feature size on spherical silicon solar cells

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Rare Metals 2006年第Z1期25卷 115-120页

作者： hayashi Shota MINEMOTO Takashi TAKAKURA Hideyuki HAMAKAWA Yoshihiro College of Science and Engineering Ritsumeikan University 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan

The effects of surface texturing on spherical silicon solar cells were investigated. Surface texturing for spherical Si solar cells was prepared by immersing p-type spherical Si crystals in KOH solution with stirring. Two kinds of texture feature sizes (1 and 5 μm pyramids) were prepared by changing stirring speed. After fabrication through our baseline processes, these cells were evaluated by solar cell performance and external quantum efficiency. The cell with 1 and 5 μm pyramids shows the short circuit current density (Jsc) value of 31.9 and 33.2 mA·cm-2, which is 9% and 13% relative increase compared to the cell without texturing. Furthermore, the cell with 5 μm pyramids has a higher open-circuit voltage (0.589 V) than the cell with 1 μm pyramids (0.577 V). As a result, the conversion efficiency was improved from 11.4% for the cell without texturing to 12.1% for the cell with 5 μm pyramids.

关键词： solar cell spherical silicon texturing alkali etching

RadonPy:automated physical property calculation using all-atom classical molecular dynamics simulations for polymer informatics

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npj Computational Materials 2022年第1期8卷 2155-2169页

作者： Yoshihiro hayashi Junichiro Shiomi Junko Morikawa Ryo Yoshida The Institute of Statistical Mathematics(ISM) Research Organization of Information and Systems10-3 Midori-choTachikawaTokyo190-8562Japan Department of Mechanical Engineering The University of Tokyo7-3-1 HongoBunkyoTokyo113-8656Japan Institute of Engineering Innovation The University of Tokyo2-11 YayoiBunkyo-kuTokyo113-0032Japan Department of Materials Science and Engineering School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo152-8552Japan Research and Services Division of Materials Data and Integrated System(MaDIS) National Institute for Materials Science(NIMS)1-2-1 SengenTsukubaIbaraki305-0047Japan Department of Statistical Science School of Multidisciplinary ScienceThe Graduate University of Advanced Studies(SOKENDAI)10-3 Midori-choTachikawaTokyo190-8562Japan

The spread of data-driven materials research has increased the need for systematically designed materials property ***,the development of polymer databases has lagged far behind other material *** present RadonPy,an open-source library that can automate the complete process of all-atom classical molecular dynamics(MD)simulations applicable to a wide variety of polymeric ***,15 different properties were calculated for more than 1000 amorphous *** MD-calculated properties were systematically compared with experimental data to validate the calculation conditions;the bias and variance in the MD-calculated properties were successfully calibrated by a machine learning *** the high-throughput data production,we identified eight amorphous polymers with extremely high thermal conductivity(>0.4 W∙m^(–1)∙K^(–1))and their underlying *** to the advancement of materials informatics since the advent of computational property databases for inorganic crystals,database construction using RadonPy will promote the development of polymer informatics.

关键词： property calculation dynamics