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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 647-666页

作者： Usama Zafar Chandra Shekhar Goit masato Saitoh Riku Fukuda School of Science and Engineering Saitama University255 Shimo-OkuboSaitamaJapan

Piles in a group experience additional displacements in soil due to pile-to-pile interactions apart from those resulting from the external *** effect of these interactions determined assuming soil as an elastic and/or viscoelastic material on pile head impedance functions of the pile group is studied by relating the group stiffness to the static stiffness of a single ***,the prevailing elastic solutions may misestimate the resulting pile group response due to the lack of consideration for either soil(material)and/or soil-pile interface *** is well established that soil behaves nonlinearly under moderate-to-high loading amplitudes,and besides,the soil-pile interface nonlinearity can exist even at small loading *** study addresses the effects of these nonlinearities on the vertical impedance functions of a 3×3-pile group using numerical methods by direct analyses and superposition using pile-to-pile interaction *** numerical results are validated using scaled model tests under 1 g *** results highlight the overestimation of pile-to-pile interactions in the pile group when assuming elastic soil *** cases either by direct analyses or superposition approach involving soil and soil-pile interface nonlinearities agree well with the experimental pile group responses under close-to-elastic and nonlinear conditions.

关键词： impedance functions numerical simulations model-scale experiment superposition approach soil-pile interface nonlinearity

Is germinal center selection required for influenza vaccination?

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Cellular & Molecular Immunology 2017年第8期14卷 655-657页

作者： Kosuke Miyauchi masato Kubo Laboratory for Cytokine Regulation Research Center for Integrative Medical Science(IMS)RIKEN Yokohama InstituteYokohamaKanagawa 230-0045Japan Division of Molecular Pathology Research Institute for Biomedical ScienceTokyo University of ScienceNodaChiba 278-0022Japan

It has long been believed that the generation of high-affinity neutralizing antibodies is critical for antiviral humoral *** production of high-affinity antibodies depends on the formation of germinal centers(GC)in ly... 详细信息

关键词： centers center neutral

Effect of diethylstilbestrol on polyamine metabolism in hamster epididymis

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Asian Journal of Andrology 2003年第4期5卷 301-306页

作者： masato Ohe Shigeru Matsuzaki Department of Biochemistry Dokkyo University School of Medicine Mibu 321-0293 Tochigi JapanDepartment of Biochemistry Dokkyo University School of Medicine Mibu 321-0293 Tochigi Japan

Aim: To investigate the effect of diethylstilbestrol (DES), one of the most potent endocrine disruptors, on the metabolism of polyamines in hamster epididymis. Methods: Male golden hamsters of 7-week-old were kept under a light and dark cycle of 14 h and 10 h for 1 week to stimulate maximally the gonadal function. DES was injected subcutaneously at doses of 0.01 mg·kg-1·day-1, 0.1 mg·kg-1·day-1 and 1 mg·kg-1·day-1 for one week. Results: DES treatment caused a significant decrease in the weight of epididymis. The activity of epididymal ornithine decar boxylase (ODC) increased 1 day after DES treatment, kept at a high level for 4 days and then decreased to nearly normal level at day 7. The activity of spermidine/spermine N1-acetyltransferase (SSAT) also increased transiently after DES treatment. The contents of putrescine, spermidine, spermine and N1-acetylspermidine were increased 1 day -4 days after DES treatment and restored to normal at day 7. All these changes showed a marked difference between the caput and the cauda. Conclusion: The polyamine biosynthesis in the hamster epididymis can be affected by DES, a xenoestrogen. DES may probably affect polyamine metabolism in the epididymis by regulating the rate-limiting enzymes involved in the polyamine biosynthesis.

关键词： diethylstilbestrol polyamines ornithine decarboxylase spermidine/spermine N1-acetyltransferase

Lattice Boltzmann Simulation of Nucleate Pool Boiling in Saturated Liquid

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Communications in Computational Physics 2011年第5期9卷 1347-1361页

作者： Yoshito Tanaka masato Yoshino Tetsuo Hirata Department of Mathematics and System Development Engineering Interdisciplinary Graduate School of Science and TechnologyShinshu University4-17-1WakasatoNagano-shiNagano 380-8553Japan Department of Mechanical Systems Engineering Faculty of EngineeringShinshu UniversityNagano-shiNagano 380-8553Japan CREST Japan Science and Technology Agency4-1-8HonchoKawaguchi-shiSaitama 332-0012Japan

A thermal lattice Boltzmann method(LBM)for two-phase fluid flows in nucleate pool boiling process is *** the present method,a new function for heat transfer is introduced to the isothermal LBM for two-phase immiscible fluids with large density *** calculated temperature is substituted into the pressure tensor,which is used for the calculation of an order parameter representing two phases so that bubbles can be formed by nucleate *** using this method,twodimensional simulations of nucleate pool boiling by a heat source on a solid wall are carried out with the boundary condition for a constant heat *** flow characteristics and temperature distribution in the nucleate pool boiling process are *** is seen that a bubble nucleation is formed at first and then the bubble grows and leaves the wall,finally going up with deformation by the buoyant *** addition,the effects of the gravity and the surface wettability on the bubble diameter at departure are numerically *** calculated results are in qualitative agreement with other theoretical predictions with available experimental data.

关键词： Lattice Boltzmann method(LBM) two-phase fluid flows heat transfer nucleate pool boiling wettability

Three-Dimensional Lattice Boltzmann Simulation of Two-Phase Flow Containing a Deformable Body with a Viscoelastic Membrane

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Communications in Computational Physics 2011年第5期9卷 1397-1413页

作者： Toshiro Murayama masato Yoshino Tetsuo Hirata Department of Mathematics and System Development Engineering Interdisciplinary Graduate School of Science and TechnologyShinshu University4-17-1 WakasatoNagano-shiNagano 380-8553Japan Satellite Venture Business Laboratory(SVBL) Shinshu University3-15-1 TokidaUeda-shiNagano 386-8567Japan Department of Mechanical Systems Engineering Faculty of EngineeringShinshu University4-17-1 WakasatoNagano-shiNagano 380-8553Japan CREST Japan Science and Technology Agency4-1-8 HonchoKawaguchi-shiSaitama 332-0012Japan

The lattice Boltzmann method(LBM)with an elastic model is applied to the simulation of two-phase flows containing a deformable body with a viscoelastic *** numerical method is based on the LBM for incompressible two-phase fluid flows with the same *** body has an internal fluid covered by a viscoelastic membrane of a finite *** elastic model is introduced to the LBM in order to determine the elastic forces acting on the viscoelastic membrane of the *** the present method,we take account of changes in surface area of the membrane and in total volume of the body as well as shear deformation of the *** using this method,we calculate two problems,the behavior of an initially spherical body under shear flow and the motion of a body with initially spherical or biconcave discoidal shape in square pipe *** deformations of the body(the Taylor shape parameter)for various shear rates are in good agreement with other numerical ***,tank-treading motion,which is a characteristic motion of viscoelastic bodies in shear flows,is simulated by the present method.

关键词： Lattice Boltzmann method(LBM) two-phase flow viscoelastic membrane shear flow tank-treading motion

Automated estimation of materials parameter from X-ray absorption and electron energy-loss spectra with similarity measures

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npj Computational Materials 2019年第1期5卷 815-821页

作者： Yuta Suzuki Hideitsu Hino masato Kotsugi Kanta Ono Department of Materials Science and Technology Tokyo University of ScienceTokyoJapan High Energy Accelerator Research Organization Institute of Materials Structure ScienceTsukubaJapan The Institute of Statistical Mathematics TokyoJapan Center for Materials Research by Information Integration(CMI2) Research and Services Division of Materials Data and Integrated System(MaDIS)National Institute for Materials Science(NIMS)Tsukuba 305-0047Japan

Materials informatics has significantly accelerated the discovery and analysis of materials in the past *** of the key contributors to accelerated materials discovery is the use of on-the-fly data analysis with high-throughput experiments,which has given rise to the need for accelerated and accurate automated estimation of the properties of *** this regard,spectroscopic data are widely used for materials discovery because these data include essential information about *** important requirement for the realisation of the automated estimation of materials parameters is the selection of a similarity measure,or kernel *** required measure should be robust in terms of peak shifting,peak broadening,and ***,the determination of appropriate similarity measures for spectra and the automated estimation of materials parameters from these spectra currently remain *** examined major similarity measures to evaluate the similarity of both X-ray absorption and electron energy-loss *** similarity measures show good correspondence with the materials parameter,that is,the crystal-field parameter,in all *** Pearson's correlation coefficient was the highest for the robustness against noise and peak *** obtained the regression model for the crystal-field parameter 10 Dq from the similarity of the *** regression model enabled the materials parameter,that is,10 Dq,to be automatically estimated from the *** regard to research progress in similarity measures,this methodology would make it possible to extract the materials parameter from a large-scale dataset of experimental data.

关键词： materials similarity parameter

Impact of changing our cannulation method on the incidenceof post-endoscopic retrograde cholangiopancreatography pancreatitis after pancreatic guidewire placement

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World Journal of Gastroenterology 2011年第48期17卷 5289-5294页

作者： Takeshi Hisa Ryusuke Matsumoto masato Takamatsu Masayuki Furutake Department of Internal Medicine Saku Central Hospital

AIM： To clarify whether the incidence of post-endoscopic retrograde cholangiopancreatography （ERCP） pancreatitis （PEP） after pancreatic guidewire placement （PGW） can be reduced by using a different cannulation method. METHODS： BebNeen April 2001 and October 2009, PGW was performed in 142 patients with native papilla to overcome difficult biliary cannulation. Our cannulation method for ERCP was changed from contrast injection （CI） using a single-lumen catheter （April 2001-May 2008） to wire-guided cannulation （WGC） using a double-lumen catheter （June 2008-October 2009）. The CI protocol was also changed during the study period： in the first period it was used for routine pancreatography for detecting small pancreatic cancer （April 2001-November 2002）, whereas in the second period it was not （December 2002-May 2008）. In PGW with CI using a single- lumen catheter, the contrast medium in the catheter lumen was injected into the pancreatic duct. The success rate of biliary cannulation, the incidence of PEP according to the cannulation method, and the impact of CI using a single-lumen catheter on PEP in comparison with WGC using a double-lumen catheter were ***： CI with routine pancreatography, CI without routine pancreatography, and WGC were performed in 27 patients, 77 patients and 38 patients, respectively. Routine pancreatography did not contribute to the early diagnosis of pancreatic cancer in our study period. In CI without routine pancreatography and WGC, diagnostic pancreatography was performed in 17 patients and no patients, respectively. The success rate of biliary cannulation by PGW alone was 69%, and the final success rate was increased to 80.3% by the addition of consecutive maneuvers or a second ERCP. PEP occurred in 22 patients （15.5%）, and the severity was mild in all cases. When analyzed according to cannulation method, the incidence of PEP was 37.0% （10/27） in the patients who underwent CI with routine pancreatography, 14.3% （11/77） in tho

关键词： Pancreatic guidewire placement Wire-guidedcannulation Contrast injection Difficult biliary cannulation Post-endoscopic retrograde cholangiopancreatography pan-creatitis

Natural purification effects in the river in consideration with domestic wastewater pollutant discharge reduction effects

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Journal of Environmental Sciences 2010年第6期22卷 892-897页

作者： Yoshiaki Tsuzuki masato Fujii Yasuo Mochihara Kouki Matsuda Minoru Yoneda Research Center for Coastal Lagoon Environments Shimane University Ministry of Land InfrastructureTransportation and Tourism Environmental Engineering Graduate School of EngineeringKyoto University

The first social experiment program in Japan to reduce domestic wastewater pollutant discharge by ＂soft interventions＂ in households has been conducted in the Yamato-gawa River drainage area since 2005. The Yamato-gawa River has been listed as one of the worst water quality rivers in Japan because of the larger annual average BOD. ＂Hard interventions＂ including deployment of wastewater treatment facilities and artificial installation of natural purification facilities in the river has been conducted in these years to improve river water quality. At the first Yamato-gawa River social experiment program （YR-SEP） in March 2005, BOD at the monitoring point near the river mouth decreased about 6% during the Program. Natural purification effect along the river was evaluated in this article with one-dimensional water quality model for the six river sections. Larger biological oxygen consumption rate, kb, was estimated in the sections with artificially installed natural purification facilities. The effect of ＂soft interventions＂ in households in the YR-SEP was estimated as 25% BOD decrease in the nearest monitoring point to the river mouth, when all the households participate in the Program and BOD discharge reduction rate with ＂soft interventions＂ in households was 40%.

关键词： Yamato-gawa River "soft interventions" in households one-dimensional water quality model

Prediction of pressure-promoted thermal rejuvenation in metallic glasses

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npj Computational Materials 2016年第1期2卷 124-132页

作者： Narumasa Miyazaki masato Wakeda Yun-Jiang Wang Shigenobu Ogata Department of Mechanical Science and Bioengineering Graduate School of Engineering ScienceOsaka UniversityOsakaJapan State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijingChina Center for Elements Strategy Initiative for Structural Materials(ESISM) Kyoto UniversityKyotoJapan

Rejuvenation is the structural excitation of glassy materials,and is a promising approach for improving the macroscopic deformability of metallic *** atomistic study proposes the application of compressive hydrostatic pressure during the glass-forming quenching process and demonstrates highly rejuvenated glass states that have not been attainable without the application of ***,the pressure-promoted rejuvenation process increases the characteristic short-and mediumrange order,even though it leads to a higher-energy glassy ***‘local order’–‘energy’relation is completely opposite to conventional thinking regarding the relation,suggesting the presence of a well-ordered high-pressure glass/high-energy glass *** also demonstrate that the rejuvenated glass made by the pressure-promoted rejuvenation exhibits greater plastic performance than as-quenched glass,and greater strength and stiffness than glass made without the application of *** is thus possible to tune the mechanical properties of glass using the pressure-promoted rejuvenation technique.

关键词： glasses metallic glassy

Evaluation of the Fatigue Characteristics of Laser-processed Hot Work Tool Steel Based on Reliability

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Journal of Materials Science & Technology 2003年第Z1期19卷 83-85页

作者： Satoshi HANAKI Yahong SUI masato YAMASHITA Hitoshi UCHIDA Hironobu TSUJII Graduate School of Engineering Himeji Institute of Technology Japan Himeji Institute of Technology Japan Graduate School of Engineering Himeji Institute of Technology Japan Graduate School of Engineering Himeji Institute of Technology Japan Technical Research Laboratories Sanyo Special Steel Co Japan

It is reported that laser-processing is effective to repair the heat checks, which are fine shallow cracks on a surfaceof die-casting dies. In this study, the rotating bending fatigue tests have been carried out to evaluate the fatiguecharacteristics of laser-processed hot working tool steel. Because test results are scattered, S-N curves are decidedbased on the evaluation of fatigue strength distribution. As a result, the fatigue strength of the laser-processedspecimens decreases remarkably in comparison with that of base metal. However, it can be recovered to almostinitial value by heat treatment at secondary hardening temperature. This procedure is also effective to decrease thescatter of fatigue strength. The laser-processing can be carried out at low cost and this method is effective for theextension of the work life of dies.

关键词： Hot working tool steel, Laser-processing, S-N curve, Fatigue strength, Reliability