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Journal of systems science & Complexity 2010年第1期23卷 1-2页

作者： Yoshimasa nakamura Kyoto University

This special issue presents some new progress in mathematical methods for informatics, engineeringand management that is expected to trigger thought and deepen further research. Forthis purpose, 14 papers were selected mainly from the invited talks at the CAs-Kyoto UniversityJoint Workshop on Mathematical Methods for Informatics, Engineering and Management,

关键词： special Issue for some new progress made by AMss and Kyoto University on mathematical methods for informatics,engineering and management

Impairment of innate immune responses in cirrhotic patients and treatment by branched-chain amino acids

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World Journal of Gastroenterology 2014年第23期20卷 7298-7305页

作者： Ikuo nakamura Department of Gastroenterology Tokyo Medical UniversityTokyo 160-0023Japan Department of Gastroenterology Saitama Medical CenterJichi Medical UniversitySaitama 330-8503Japan

It has been reported that host defense responses, such as phagocytic function of neutrophils and natural killer (NK) cell activity of lymphocytes, are impaired in cirrhotic patients. This review will concentrate on the impairment of innate immune responses in decompensated cirrhotic patients and the effect of the treatment by branched-chain amino acids (BCAA) on innate immune responses. We already reported that phagocytic function of neutrophils was significantly improved by 3-mo BCAA supplementation. In addition, the changes of NK activity were also significant at 3 mo of supplementation compared with before supplementation. Also, Fisher’s ratios were reported to be significantly increased at 3 mo of BCAA supplementation compared with those before oral supplementation. Therefore, administration of BCAA could reduce the risk of bacterial and viral infection in patients with decompensated cirrhosis by restoring impaired innate immune responses of the host. In addition, it was also revealed that BCAA oral supplementation could reduce the risk of development of hepatocellular carcinoma in cirrhotic patients. The mechanisms of the effects will also be discussed in this review article.

关键词： Branched-chain amino acids Liver cirrhosis Innate immunity Natural killer cell activity of lymphocytes Phagocytic function of neutrophils

The relationship between formate adsorption energy and electronic properties: A first principles density functional theory study

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science China Chemistry 2009年第9期52卷 1427-1433页

作者： MORIKAWA Yoshitada nakamura Junji The Institute of scientific and Industrial Research (IsIR) Osaka University Research Institute for Computational sciences (RICs) National Institute of Advanced Industrial Science and Technology (AIST) Institute of Materials science University of Tsukuba

First principles density functional theory calculations have been performed for the chemisorption of formate adsorption on some metal surfaces. For the most stable adsorption site of short-bridge, the calculated formate adsorption energy follows the order of Au(110) sts between the adsorption energy and the corresponding heat of formation of metal oxides. Moreover, it has been found that the formate adsorption energy for the transition metals can be correlated well with its d-band center (εd), and the IB Group metals can be described by the coupling matrix element square (Vad2).

关键词： formate metal DFT-GGA slab model adsorption energy d-band center

A NEW APPROACH AND ERROR ANALYsIs FOR RECONsTRUCTING THE sCATTERED WAVE BY THE POINT sOURCE METHOD

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Journal of Computational Mathematics 2007年第2期25卷 113-130页

作者： Jijun Liu Gen nakamura Roland Potthast Department of Mathematics Southeast University Nanjing 210096 China Department of Mathematics Graduate School of Science Hokkaido University Sapporo 060-0810 Japan Institute for Numerical and Applied Mathematics University of Gottingen Lotzestr 16-1837085 Gottingen Germany

Consider an inverse scattering problem by an obstacle D belong to R^2 with impedance boundary. We investigate the reconstruction of the scattered field u^s from its far field pattern u^∞ using the point source method. First, by applying the boundary integral equation method, we provide a new approach to the point-source method of Potthast by classical potential theory. This extends the range of the point source method from plane waves to scattering of arbitrary waves. second, by analyzing the behavior of the Hankel function, we obtain an improved strategy for the choice of the regularizing parameter from which an improved convergence rate （compared to the result of [15]） is achieved for the reconstruc- tion of the scattered wave. Third, numerical implementations are given to test the validity and stability of the inversion method for the impedance obstacle.

关键词： Inverse scattering Regularization Error estimate Numerics

THE LOCAL WELL-POsEDNEss OF A CHEMOTAXIs-sHALLOW WATER sYsTEM WITH VACUUM

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Acta Mathematica scientia 2021年第1期41卷 231-240页

作者： Jishan FAN Fucai LI Gen nakamura Department of Applied Mathematics Nanjing Forestry UniversityNanjing 210037China Department of Mathematics Nanjing UniversityNanjing 210093China Department of Mathematics Hokkaido UniversitySapporo 060-0810Japan

In this paper we prove the local well-posedness of strong solutions to a chemotaxisshallow water system with initial vacuum in a bounded domainΩ■R^(2)without the standard compatibility condition for the initial *** ... 详细信息

关键词： chemotaxis shallow water vacuum local well-posedness strong solution

NEUTRINO MAss, MIXING, AND OsCILLATIONs

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Chinese Physics C 2016年第10期40卷 246-278页

作者： K. nakamura s.T. Petcov Kavli IPMU (WPI) U. TokyoKEK sIssA/INFN Trieste Kavli IPMU (WPI) U.Tokyo Bulgarian Academy of Sciences

The experiments with solar, atmospheric, reactor and accelerator neutrinos have provided compelling evidences for oscillations of neutrinos caused by nonzero neutrino masses and neutrino mixing. The data imply the existence of 3-neutrino mixing in vacuum. We review the theory of neutrino oscillations, the phenomenology of neutrino mixing, the problem of the nature - Dirac or Majorana, of massive neutrinos, the issue of CP violation in the lepton sector, and the current data on the neutrino masses and mixing parameters. The open questions and the main goals of future research in the field of neutrino mixing and oscillations are outlined.

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Attenuation and Distortion of Compression Waves Propagating in Very Long Tube

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Journal of Thermal science 2011年第1期20卷 53-57页

作者： shinya nakamura Daisuke sAsA Toshiyuki AOKI Graduate school of Engineering sciences Kyushu UniversityKasugaFukuoka816-8580Japan

A lot of phenomena related to propagating various waves are seen when the high-speed train goes through the tunnel,the gas pipeline is broken due to an accident or the air brake of the wagon *** instance,a compression wave generated ahead of a high-speed train entering a tunnel propagates to the tunnel exit and spouts as a micro pressure wave,which causes an exploding *** order to estimate the magnitude correctly,the mechanism of the attenuation and distortion of a compression wave propagating along a very long tunnel must be understood and the experimental information on these phenomena is *** experimental investigation is carried out to clarify the attenuation and distortion of the propagating compression wave in a very long *** results show that the strength of a compression wave decreases with *** attenuation and distortion of compression waves are affected by the initial waveform of the compression wave and by the unsteady boundary layer induced by the propagating *** shape of a compression wave becomes different with the propagating distance;that is,a shock wave appears just head of a wavefront and an overshoot on pressure distribution is observed behind a shock wave due to the transition of the unsteady boundary layer.

关键词： Propagating Compression Wave Very Long Tube Micro-pressure Wave High-speed Train

A new cascade-less engine operated from subsonic to hypersonic conditions: designed by computational fluid dynamics of compressible turbulence with chemical reactions

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Journal of Thermal science 2010年第6期19卷 481-485页

作者： Ken Naitoh Kazushi nakamura Takehiro Emoto Waseda University Faculty of Science and Engineering

By using our computational fluid dynamic models, a new type of single engine capable of operating over a wide range of Mach numbers from subsonic to hypersonic regimes is proposed for airplanes, whereas traditional piston engines, turbojet engines, and scram engines work only under a narrower range of operating conditions. The new engine has no compressors or turbines such as those used in conventional turbojet engines. An important point is its system of super multijets that collide to compress gas for the transonic regime. Computational fluid dynamics is applied to clarify the potential of this engine. The peak pressure at the combustion center is over 2.5 MPa, while that just before ignition is over 1.0 MPa. The maximum power of this engine will be sufficient for actual use. Under the conditions of higher Mach numbers, the main intake passage located in front of the super multijet nozzles, takes in air more. That results in a ram or scramjet engine for supersonic and hypersonic conditions.

关键词： Aircraft engine multijets twister system compressible flow

Low-Energy spin Excitations in Detwinned Fese

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Chinese Physics Letters 2024年第6期41卷 112-118页

作者：刘瑞鲜 Mitsutaka nakamura Kazuya Kamazawa 鲁兴业 Center for Advanced Quantum studies School of Physics and AstronomyBeijing Normal UniversityBeijing 100875China J-PARC Center Japan Atomic Energy Agency(JAEA)TokaiIbaraki 319-1195Japan Research Center for Neutron science and Technology Comprehensive Research Organization for Science and SocietyTokaiIbaraki 319-1106Japan

Antiferromagnetic spin fluctuation is regarded as the leading driving force for electron pairing in high-Tc *** iron-based superconductors,spin excitations at low energy range,especially the spin-resonance mode at ER~5kBTc,are important for understanding the ***,we use inelastic neutron scattering(INs)to investigate the symmetry and in-plane wave-vector dependence of low-energy spin excitations in uniaxial-strain detwinned Fe *** low-energy spin excitations(Esuperconducting state(T9K)and the nematic state(T90 K),confirming the constant C_(2) rotational symmetry and ruling out the C_(4) mode at E≈3 meV reported in a prior INs ***,our results reveal an isotropic spin resonance in the superconducting state,which is consistent with the s±wave pairing *** slightly higher energy,low-energy spin excitations become highly *** full width at half maximum of spin excitations is elongated along the transverse *** Q-space isotropic spin resonance and highly anisotropic low-energy spin excitations could arise from dyz intra-orbital selective Fermi surface nesting between the hole pocket aroundΓpoint and the electron pockets centered at MX point.

关键词： excitation symmetry slightly

The effect of interface roughness on the perpendicular exchange bias of NiO/CoPt/Pt stacking structure

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science China(Technological sciences) 2021年第3期64卷 605-610页

作者： GAO Ying HARUMOTO Takashi nakamura Yoshio sHI Ji Department of Materials science and Engineering Tokyo Institute of Technology2-12-1OokayamaMeguro-kuTokyo 152-8550Japan

An orthogonal coupling structure of NiO/CoPt/Pt/glass with perpendicular exchange bias effect has been *** exchange bias is found to be strongly dependent on the interface roughness between NiO and CoPt *** conventional inverse proportionality of the exchange bias field with the ferromagnetic thickness is not applicable to this top-pinned stacking ***,an anomalous ferromagnetic thickness dependence of blocking temperature is also observed.A simulation on the basis of a spin configuration model with defects at the interface agrees well with the experimental *** findings suggest considerable contribution of the interface roughness to the perpendicular exchange bias.

关键词： perpendicular exchange bias interface roughness FM thickness blocking temperature