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A laboratory study of directional spectrawith maximum likelihood mehod─ⅡDecaying swell

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Acta Oceanologica Sinica 1999年第1期18卷 75-85页

From measurements by a circular array consisting of 18 wave gauges in a large wave tank, directional spectra of swell in deep water are systematically investigated with maximum likelihood method. It is shown that the directional spreading of swell, qualitatively similar to that of developing wind wave which is narrowest in the region of Peak frequency and bxoadens with increasing or decreasing frequency, can be effectively described by cos2s(θ/2) introduced by Longuet-Higgins et al. (1963,Ocean Wave Spectra, 111~136). It is intriguing that bimodal distribution found in our experiments appers at the forward face instead of the rear face of a frequency spectrum in the cases of nonlinearity being very weak. Parameterized by nonlinearity, formulations which can be applied to swell as well as wind wave are proposed. It is concluded that nonlinear interaction plays a central role in controlling the development of directional angular spreading even for the swell.

关键词： Directional spectrum maximum likelihood method swell wind wave

Nondestructive and active interrogation system for special nuclear material:proof of principle and initial results

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Nuclear Science and Techniques 2024年第5期35卷 216-225页

作者： Mahmoud Bakr Kai masuda Yoshiyuki Takahashi Tsuyoshi Misawa Norio Yamakawa Tomas Scott Institute of Advanced Energy Kyoto UniversityGokashoUjiKyoto 611‑0011Japan School of Physics University of BristolBs81TL Tyndall AvenueBristolUK Physics Department Faculty of ScienceAssiut UniversityAssiut 71516Egypt Research Reactor Institute Kyoto University2 Asashiro‑NishiKumatoriOsaka 590‑0494Japan Pony Industry Co.Ltd. 2‑3‑6 Kitakyuhoji‑MachiChuo‑KuOsaka 541‑0057Japan Astral Neutronics LTD Unit H5HallenBristol BS107SBUK

Herein,we employ the threshold energy neutron analysis(TENA)technique to introduce the world's first active interrogation system to detect special nuclear materials(SNMs),including U-235 and *** system utilizes a DD neutron generator based on inertial electrostatic confinement(IEC)to interrogate suspicious *** detect secondary neutrons produced during fission reactions induced in SNMs,a tensioned metastable fluid detector(TMFD)is *** current status of the system's development is reported in this paper,accompanied by the results from experiments conducted to detect 10 g of highly enriched uranium(HEU).Notably,the experimental findings demonstrate a distinct difference in the count rates of measurements with and without *** difference in count rates surpasses two times the standard deviation,indicating a confidence level of more than 96% for identifying the presence of *** paper presents and extensively discusses the proof-of-principle experimental results,along with the system's planned trajectory.

关键词： Special nuclear materials Uranium detection Inertial electrostatic confinement fusion TENA HEU CTMFD

Small-for-size syndrome in liver transplantation:Definition,pathophysiology and management

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Hepatobiliary & Pancreatic Diseases International 2020年第4期19卷 334-341页

作者： Yuichi masuda Kazuki Yoshizawa Yasunari Ohno Atsuyoshi Mita akira Shimizu Yuji Soejima Division of Gastroenterological Hepato-Biliary-PancreaticTransplantation and Pediatric SurgeryDepartment of SurgeryShinshu University School of Medicine3-1-1 AsahiMatsumotoNaganoJapan

Background:Since the first success in an adult patient,living donor liver transplantation(LDLT)has become an universally used ***-for-size syndrome(SFSS)is a well-known complication after partial LT,especially in cases of adult-to-adult *** definition of SFSS slightly varies among transplant *** use of a partial liver graft has risks of SFSS *** portal vein(PV)hypertension and PV hyper-perfusion after LT were identified as the main ***,various approaches were explored to modulate PV flow and decrease PV pressure in order to alleviate this ***,the definition,clinical symptoms,pathophysiology,basic research,as well as preventive and treatment strategies for SFSS are reviewed based on an extensive review of the literature and on our own *** sources:The articles were collected through PubMed using search terms“liver transplantation”,“living donor liver transplantation”,“living liver donation”,“partial graft”,“small-for-size graft”,“small-forsize syndrome”,“graft volume”,“remnant liver”,“standard liver volume”,“graft to recipient body weight ratio”,“sarcopenia”,“porcine”,“swine”,and“rat”.English publications published before March 31,2020 were included in this ***:Many transplant surgeons performed PV flow modulation,including portocaval shunt,splenic artery ligation and *** these techniques,patient outcome has been improved even when using a"small"*** factors,such as preoperative recipients’nutritional and skeletal muscle status,graft congestion,and donor factors,were also identified as risk factors which all have been addressed using various ***:The surgical approach controlling PV flow and pressure could help to prevent SFSS especially in severely ill *** the absence of efficacious medications to resolve SFSS,conservative treatments,including aggressive fluid balance correction for massive ascites,anti-microbiological therapy t

关键词： Liver transplantation Living donor liver transplantation Small-for-size graft Small-for-size syndrome

On Descriptions of Products of Simplices

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Chinese Annals of Mathematics,Series B 2021年第5期42卷 777-790页

作者： Li YU Mikiya masuda Department of Mathematics Nanjing UniversityNanjing210093China Department of Mathematics Osaka City UniversitySugimotoSumiyoshi-kuOsaka 558-8585Japan

The authors give several new criteria to judge whether a simple convex polytope in a Euclidean space is combinatorially equivalent to a product of simplices. These criteria are mixtures of combinatorial, geometrical and topological conditions that are inspired by the ideas from toric topology. In addition, they give a shorter proof of a well known criterion on this subject.

关键词： Convex polytope Product of simplices Moment-angle complex

Thermal Conductivity and Tensile Properties of Carbon Nanofiber-Reinforced Aluminum-Matrix Composites Fabricated via Powder Metallurgy: Effects of Ball Milling and Extrusion Conditions on Microstructures and Resultant Composite Properties

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Acta Metallurgica Sinica(English Letters) 2019年第5期32卷 573-584页

作者： Fumio Ogawa Shuji Yamamoto Chitoshi masuda Department of Mechanical Engineering College of Science and Engineering Ritsumeikan University Kanto Gakuin University Kagami Memorial Institute for Materials Science and Technology Waseda University

Carbon nanofiber(CNF)-reinforced aluminum-matrix composites were fabricated via ball milling and spark plasma sintering(SPS), SPS followed by hot extrusion and powder extrusion. Two mixing conditions of CNF and aluminum powder were adopted: milling at 90 rpm and milling at 200 rpm. After milling at 90 rpm, the mixed powder was sintered using SPS at 560 °C. The composite was then extruded at 500 °C at an extrusion ratio of 9. Composites were also fabricated via powder extrusion of powder milled at 200 rpm and 550 °C with an extrusion ratio of 9(R9) or 16(R16). The thermal conductivity and tensile properties of the resultant composites were evaluated. Anisotropic thermal conductivity was observed even in the sintered products. The anisotropy could be controlled via hot extrusion. The thermal conductivity of composites fabricated via powder extrusion was higher than those fabricated using other methods. However, in the case of specimens with a CNF volume fraction of 4.0%, the thermal conductivity of the composite fabricated via SPS and hot extrusion was the highest. The highest thermal conductivity of 4.0% CNF-reinforced composite is attributable to networking and percolation of CNFs. The effect of the fabrication route on the tensile strength and ductility was also investigated. Tensile strengths of the R9 composites were the highest. By contrast, the R16 composites prepared under long heating duration exhibited high ductility at CNF volume fractions of 2.0% and 5.0%. The microstructures of composites and fracture surfaces were observed in detail, and fracture process was elucidated. The results revealed that controlling the heating and plastic deformation during extrusion will yield strong and ductile composites.

关键词： Al composite Carbon nanofiber Ball milling Hot extrusion Microstructure and performance

Complex trace element effects of source mixing-fractional crystallization composite processes in Kalaan granodiorite pluton along Wulungu tectonic belt,northern Xinjiang

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Science China Chemistry 1995年第8期38卷 987-995页

作者：刘伟 A.masuda Changsha Institute of Geotectonics Chinese Academy of SciencesChangsha 410013China Chemistry Department Faculty of ScienceThe University of TokyoJapan

Mixing-fractional crystallization composite processes generate 6 complex patterns,which are synthesized into 3 models,on C^2_1/C^3_1-C^1_1/C^3_1 ratio correlation plots of trace eleroents E_1,E_2,E_3 according to their relative *** of the six effects are clearly displayed on ratio-ratio correlation plots of trace elements in the Kalaan granodiorite pluton,indicative of a source mixing-fractional crystallization composite *** overlying lithospheric mantle was modified by the subduction of oceanic plate during Palaeozoic. The incompatibility order of the 7 concerned trace elements is D_(Ta)

关键词： trace element effects geochemical behavior source mixing-fractional crystallization granodiorite Kalaan

Hunting hidden pieces of signaling pathways in hepatocellular carcinoma

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Hepatobiliary Surgery and Nutrition 2019年第1期8卷 74-76页

作者： Mari masuda Laboratory of Collaborative Research Division of Cellular SignalingNational Cancer Center Research InstituteTokyoJapan

Advanced hepatocellular carcinoma(HCC)has a poor prognosis with limited treatment *** the last decade,sorafenib,a multi-tyrosine kinase inhibitor(TKI),has been the only available systemic agent for first-line treatment of unresectable HCC(1).Recently,another multi-TKI,lenvatinib,was added to the list of first-line treatment alternatives based on the results of the phase III RREFLECT *** second-line treatment,two multi-TKIs,regorafenib and cabozantinib,were approved in 2016 and 2018,*** other targeted therapies,ramucirumab and an anti-PD-1 antibody,nivolumab,will soon be added in a second-line setting to the therapeutic *** agents,however,generally lead to disease stabilization rather than tumor *** of complete remission with available systemic treatments still remains rare,however,and therapeutic breakthroughs are still needed.

关键词： hepatocellular prognosis treatment

Torsion in the Cohomology of Torus Orbifolds

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Chinese Annals of Mathematics,Series B 2017年第6期38卷 1247-1268页

作者： Hideya KUWATA Mikiya masuda Haozhi ZENG Department of Mathematics Osaka City UniversitySumiyoshi-kuOsaka 558-8585Japan School ofMathematical Sciences Fudan UniversityShanghai 200433China.

The authors study torsion in the integral cohomology of a certain family of2 n-dimensional orbifolds X with actions of the n-dimensional compact torus. Compact simplicial toric varieties are in our family. For a prime number p, the authors find a necessary condition for the integral cohomology of X to have no p-torsion. Then it is proved that the necessary condition is sufficient in some cases. The authors also give an example of X which shows that the necessary condition is not sufficient in general.

关键词： Toric orbifold Cohomology Torsion

Numerical Analysis of Turbulent Sonic Jets from Two-Dimensional Convergent Nozzles

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Journal of Thermal Science 2011年第2期20卷 133-138页

作者： Hideo KASHIMURA Yuya masuda Yoshiaki MIYAZATO Kazuyasu MATSUO Department of Control and Information Systems Engineering Kitakyushu National College of Technology 5-20-1ShiiKokuraminami-kuKitakyushuFukuoka802-0985JAPAN Department of Mechanical Systems Engineering The University of Kitakyushu1-1HibikinoWakamatsu-kuKitakyushuFukuoka808-0135JAPAN

The numerical analysis of a turbulent sonic jet from a two-dimensional convergent nozzle has been carried out using the compressible k-? turbulence model and TVD finite difference scheme. Numerical conditions have been varied over a range of operating pressure ratios from 1.893 to 6.0 which cover the jet flow conditions from correctly expanded to underexpanded. Numerical flow visualization of sonic jet structure using the computer schlieren, a relation between shock cell length in the jet with the operating pressure ratio and the pressure distribution along jet centerline are obtained. Also, a transition process of a two-dimensional sonic jet from correctly expanded to underexpanded conditions is shown in detail and a flow model of jet structure is proposed.

关键词： Sonic nozzle Underexpanded jet Shock cell length κ-ε turbulence model Numerical analysis