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Seismic assessment of two multi-tiered pagodas damaged by the 2015 Nepal earthquake

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Earthquake Engineering and Engineering Vibration 2021年第2期20卷 453-469页

作者： yohei Endo Toshikazu Hanazato Department of Architecture Shinshu University4-17-1 WakasatoNagano 380-8553Japan Department of Architecture Mie University1577 Kurimamachiya-chōTsuMie 514-8507MieJapan

A seismic assessment of two multi-tier pagodas by numerical analysis is presented *** Changu Narayan temple and the Kumbeshwar temple in Nepal are used as the case *** pagodas are built of brick masonry in earthen mortar,with timber columns and *** Changu Narayan temple is a two-tier pagoda,and was seriously damaged during the 2015 Gorkha *** Kumbeshwar temple is a five-tier pagoda,and its top-tier collapsed due to the Gorkha earthquake.A seismic assessment was carried out using finite element(FE)*** FE models were prepared,and dynamic identification tests and penetrometer tests were *** analysis and nonlinear dynamic analysis were performed as part of the seismic *** main shock of the 2015 Gorkha earthquake was considered as the input *** behavior between the two pagodas was compared with the collapse mechanisms and damage patterns observed in the actual *** comparison suggested common structural features of multi-tier *** study is dedicated to providing a better understanding of the seismic behavior of multi-tier pagoda-type structures and provides suggestions for their effective analysis.

关键词： masonry multi-tier pagoda seismic assessment nonlinear dynamic analysis FEM analysis

Evolution of the “Neutral” : Diverse Forms of Wide-Compatibility Haplotypes at the Locus for Reproductive Isolation

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Molecular Plant 2020年第4期13卷 539-540页

作者： yohei Koide Research Faculty of Agriculture Hokkaido UniversityKita 9 Nishi 9SapporoHokkaido 060-8589Japan

One of the biggest questions in evolutionary biology is how biological species *** biological species are groups of interbreeding natural populations reproductively isolated from other such groups(Mayer,1942),reproductive isolation is the key process of the *** various isolating barriers,postzygotic barriers ranging from maladaptation to inviability or sterility in the offspring have attracted biologists’attention because of the problem of the evolution of the“unfit”offspring.A clear model to solve this problem is the Dobzhansky-Muller(DM)model(Figure 1;Coyne and Orr,2004),in which incompatibilities are generally caused by an interaction between the genes that have functionally diverged in each population without selection opposing any intermediate step(Coyne and Orr,2004).

关键词： Figure Forms breeding

Synthesis and sintering of samarium rich SmS_x and its electrical property

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Journal of Rare Earths 2016年第10期34卷 1042-1047页

作者： Liang Li Shinji Hirai yohei Tasaki Department of Materials Science and Engineering Muroran Institute of Technology

Non-stoichiometric samarium monosulfide（SmS_x, 0.55≤x≤1.2） was synthesized from Sm_2S_3 and SmH_3 at 1273 K for 3 h under vacuum. The influence of reaction ratio of Sm_2S_3 to SmH_3 on the fabrication of SmS_x was investigated. The fabrication of SmS required the molar ratio of Sm_2S_3 to SmH_3 above 1. Lattice parameter of synthetic SmS_x increased firstly and then decreased to saturate following with the addition of SmH_3 content. SmS_x compact was sintered at 1373 K by spark plasma sintering. Density of synthetic SmS_x was about 99% of theory density. Seebeck coefficient of n-type semiconductor Sm Sx decreased as temperature rose. The absolute value was distributed between 170–280 μV/K. The electrical resistivity of SmS_x（0.86≤x≤1.07） decreased with temperature increasing and showed similar temperature dependence. The surplus Sm which randomly distributed in the SmS_x（0.55≤x≤0.75） matrix led to a remarked reduction of electrical resistivity. The optimized power factor for SmS_（0.6） and Sm S_（0.75） could reach 1500 μW/（K^2·m） at 600 K.

关键词： samarium monosulfide SmH_3 Seebeck coefficient electrical resistivity rare earths

Large Eddy Simulation of Swirling Jet in a Bluff-Body Burner

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Journal of Thermal Science 2005年第1期14卷 28-33页

作者： yohei FUJIMOTO Yuzo INOKUCHI Nobuhiko YAMASAKI Department of Aeronautics and Astronautics Kyushu-University 6-10-1HakozakiHigashikuFukuoka812-8581JapanDepartment of Aeronautics and Astronautics Kyushu-University 6-10-1HakozakiHigashikuFukuoka812-8581JapanDepartment of Aeronautics and Astronautics Kyushu-University 6-10-1HakozakiHigashikuFukuoka812-8581Japan

The large eddy simulation (LES) is applied to an unconfined swirling flow of an air surrounding a bluff-body having a central jet of air, and the complicated flowfield that involves the recirculation and vortex breakdown is investigated. The Smagorinsky model is used as the sub-grid scale model. The results of the present numerical simulation are compared with the experimental data of the mean and stochastic root mean square (RMS) variations of two velocity components. Although the inflow conditions are specified in a simple manner, the obtained numerical results are in reasonable agreement with the experiments, except for a part of RMS variation values near downstream of the bluff body. The present numerical calculations can successfully reproduce the two characteristics of the flow, i.e., an upstream recirculation zone established just downstream of the burner plane and the additional recirculation zone established at the more downstream location.

关键词： large eddy simulation swirl bluff-body recirculation.

Computational fluid dynamics simulation of Hyperloop pod predicting laminar–turbulent transition

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Railway Engineering Science 2020年第1期28卷 97-111页

作者： Nathalie Nick yohei Sato Department of Mechanical and Process Engineering Swiss Federal Institute of TechnologyETH ZurichLEO B 9.1Leonhardstrasse 278092 ZurichSwitzerland Nuclear Energy and Safety Research Division Paul Scherrer InstituteForschungsstrasse 1115232 Villigen PSISwitzerland

Three-dimensional compressible flow simulationswere conducted to develop a Hyperloop pod. Thenovelty is the usage of Gamma transition model, in whichthe transition from laminar to turbulent flow can be ***, a mesh dependency study was undertaken,showing second-order convergence with respect to themesh refinement. Second, an aerodynamic analysis for twodesigns, short and optimized, was conducted with thetraveling speed 125 m/s at the system pressure 0.15 *** concept of the short model was to delay the transitionto decrease the frictional drag;meanwhile that of theoptimized design was to minimize the pressure drag bydecreasing the frontal area and introduce the transitionmore toward the front of the pod. The computed resultsshow that the transition of the short model occurred moreon the rear side due to the pod shape, which resulted in 8%smaller frictional drag coefficient than that for the optimizedmodel. The pressure drag for the optimized designwas 24% smaller than that for the short design, half ofwhich is due to the decrease in the frontal area, and theother half is due to the smoothed rear-end shape. The totaldrag for the optimized model was 14% smaller than that forthe short model. Finally, the influence of the systempressure was investigated. As the system pressure and theReynolds number increase, the frictional drag coefficientincreases, and the transition point moves toward the front,which are the typical phenomena observed in the transitionregime.

关键词： Computational fluid dynamics(CFD) Drag Subsonic compressible flow Hyperloop Laminar-turbulent transition

Synthesis of Nitrogen-doped Titania by Solvothermal Reactions in Alcohols

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过程工程学报 2006年第3期6卷 472-476页

作者： Tsugio Sato yohei Aida Masakazu Komatsu 殷澍 Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980-8577Japan

Nitrogen-doped titania nanoparticles were obtained by the homogeneous precipitation in hexamethylenetetraminetitanium trichloride-alcohol aqueous solutions at 90 ℃ followed by heating at 190 ℃. Anatase, rutile and brookite were obtained, where the crystallite size, specific surface area and color greatly changed as 5～50 nm, 20～200 m2/g and light gray to yellow, depending on the solvent and pH. The products after calcination were yellow, indicating doping with nitrogen ion. All colored titania showed photocatalytic activity under visible light irradiation for the oxidative decomposition of nitrogen monoxide in air. Especially, the nanoparticles of anatase type nitrogen-doped titania obtained using methanol aqueous solution showed excellent photocatalytic activity.

关键词： nitrogen-doped titania solvothermal synthesis alcohol photocatalysis nitrogen monoxide decomposition

Facile synthesis and characterization of a novel thiophene-fused polycyclic aromatics based on pyrene

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Chinese Chemical Letters 2011年第7期22卷 819-822页

作者： Daiki hoshino Tsuyoshi Morita Yasushiro Nishioka College of Science and Technology Nihon UniversityNarashinodaiFunabashiChiba 2748501Japan

A novel large thiophene-fused polycyclic aromatics 1 based on pyrene 5 has been synthesized, and its structure was confirmed by ^1H NMR, ^13C NMR, MS, UV-vis and elemental analysis. The key steps of the synthesis involved the Stille cross-coupling reaction and followed by selective β-β oxidative cyclization of pendant thienyl rings by FeCl3 under mild conditions.

关键词： Pyrene Thiophene Stille coupling reaction Oxidative cyclization

Efficient high harmonics generation by enhancement cavity driven with a post-compressed FCPA laser at 10 MHz

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High Power Laser Science and Engineering 2018年第2期6卷 45-50页

作者： Zhigang Zhao Akira Ozawa Makoto Kuwata-Gonokami yohei Kobayashi The Institute for Solid State Physics The University of Tokyo Department of Physics Graduate School of Science The University of Tokyo

Efficient high harmonics generation(HHG) was demonstrated at 10 MHz repetition rate with an external femtosecond enhancement cavity, seeded by a ～70 fs post-compressed 10 MHz fiber chirped pulse amplifier(FCPA) laser. Operation lasting over 30 min with 0.1 m W outcoupled power at 149 nm was demonstrated. It was found that shorter pulse was beneficial for alleviating the nonlinear plasma effect and improving the efficiency of HHG. Low finesse cavity can relax the plasma nonlinearity clamped intra-cavity power and improve the cavity-locking stability. The pulse duration is expected to be below 100 fs for both 1040 nm and 149 nm outputs, making it ideal for applications such as time-resolved photoemission spectroscopy.

关键词： enhancement cavity high harmonics generation ultrafast fiber lasers

Pemafibrate,a potent selective peroxisome proliferator-activated receptorαmodulator,a promising novel treatment for ischemic retinopathy?

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Neural Regeneration Research 2023年第7期18卷 1495-1496页

作者： UCCAODeokhoLee yohei Tomita Kazuno Negishi Toshihide Kurihara Department of Ophthalmology Keio University School of MedicineShinanomachiShinjuku-kuJapan

Ischemic retinopathy is a retinal disease caused by ischemic *** is a common pathologic mechanism in various retinal disorders and diseases such as age-related macular degeneration,diabetic retinopathy,glaucoma,or vascular occlusion(Osborne et al.,2004).Although various murine models have been developed to understand a series of metabolic mechanisms induced by retinal ischemia and further used to test promising therapeutics,effective treatment in ischemic retinopathy has not been clearly *** is associated with the notion that the contributing pathologic metabolic pathways might be enormously complex.

关键词： retinopathy degeneration