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Acetylene Vacuum Carburizing

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材料热处理学报 2004年第5期25卷 370-374页

作者： hitoshi Iwata JH CORPORATION Aichi Japan

Almost 30 years has passed since the publication of materials on vacuum carburizing technology, and is attracting a great deal of attention as a technology capable of being used as a substitute for gas carburizing technology. However, the technology was not popular except in specific fields. The main reason for this is due to a variety of harmful influences accompanying the sooting problems caused by CH4 or C3H8. We have succeeded in that the occurrence of sooting was suppressed by utilizing acetylene, at extremely low pressure for carburizing (below 1 kPa). This process is now showing the excellent quality and prospects for this technology in terms of quality, economy and safety. At present almost 70 practical mass production furnaces are used in production lines, in Japan and abroad. At this time, we will report summary of the present acetylene vacuum carburizing process and the actual results obtained by these acetylene vacuum carburizing furnaces for mass production.

关键词：乙炔真空渗碳大量生产低压

The Fefferman-Stein-Type Inequality for the Kakeya Maximal Operator Ⅱ

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Acta Mathematica Sinica,English Series 2002年第3期18卷 447-454页

作者： hitoshi TANAKA Department of Mathematics Gakushuin University 1-5-1 Mejiro Toshima-ku Tokyo 171-8588 Japan

Let K, 0 ±1, be the Kakeya maximal operator defined as the supremum of averages over tubes of the eccentricity . The (so-called) Fefferman-Stein-type inequality: $|| {K_\delta f} ||_{L^d({{\rm R}^d,w})} \le C_d ({1 \over \delta})^{(d - 2)/2d}(\log ({1 \over \delta } ))^{\alpha_d} || f ||_{L^d ({\rm R}^d,K_{\delta}w})}$is shown, where Cd and d are constants depending only on the dimension d and w is a weight. The result contains the exponent (d-2)/2d which is smaller than the exponent (d-2)(d-1)/d(2d-3) obtained in [7].

关键词： Maximal functions Weighted inequalties

On systematic development of FSI solvers in the context of particle methods

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Journal of Hydrodynamics 2022年第3期34卷 395-407页

作者： Abbas Khayyer hitoshi Gotoh Yuma Shimizu Department of Civil and Earth Resources Engineering Kyoto UniversityKyotoJapan

This paper presents a review on state-of-the-art of developments corresponding to fluid-structure interaction(FSI)solvers developed within the context of particle *** paper reviews and highlights the potential robustness of entirely Lagrangian meshfree FSI solvers in reproducing FSI corresponding to extreme events and portrays the future perspectives for systematic developments towards reliable engineering applications with respect to rapid advances in technology and emergence of so-called advanced materials that can result in complex and highly non-linear structural ***,the paper highlights the necessity for reproduction of comprehensive structural responses,including viscoelastic,elastoplastic and progressive damages/failures,by the advanced FSI solvers developed within the context of particle *** this regard,extensions of the structure model are suggested to be conducted in a variationally consistent framework to ensure stability,accuracy and physical reliability including thermodynamic *** paper reviews basics of mathematical and numerical modelling for entirely Lagrangian meshfree hydroelastic FSI solvers and presents a brief background on extensions of such solvers towards reproducing viscoelastic structural *** preliminary numerical results on structural viscoelasticity achieved by an extended Hamiltonian SPH(HSPH)model are *** vision paper also concisely portrays the future perspectives for systematic development of particle-based FSI solvers.

关键词： Fluid-structure interaction(FSI) entirely Lagrangian meshfree smoothed particle hydrodynamics(SPH) Hamiltonian SPH(HSPH) viscoelasticity

Morrey Spaces for Non-doubling Measures

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Acta Mathematica Sinica,English Series 2005年第6期21卷 1535-1544页

作者： Yoshihiro SAWANO hitoshi TANAKA Graduate. School of Mathematical Sciences The University of Tokyo 3-8-1 KomabaMeguro-ku Tokyo 153-8914 Japan

The authors give a natural definition of Morrey spaces for Radon measures which may be non-doubling but satisfy certain growth condition, and investigate the boundedness in these spaces of some classical operators in ... 详细信息

关键词： Morrey space non-doubling measure vector-valued

Comparison of the effects of submerged laser peening,cavitation peening and shot peening on the improvement of the fatigue strength of magnesium alloy AZ31

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Journal of Magnesium and Alloys 2023年第5期11卷 1592-1607页

作者： hitoshi Soyama Chieko Kuji Yiliang Liao Department of Finemechanics Tohoku University6-6-01 AobaAramakiAoba-kuSendai 980-8579Japan Department of Industrial and Manufacturing Systems Engineering Iowa State University2529 Union Dr.AmesIA 50011United States of America

To investigate the improvement in the fatigue strength of magnesium alloy by peening methods,magnesium alloy AZ31 was treated by submerged laser peening(SLP),cavitation peening(CP),and shot peening(SP),and the fatigue properties were evaluated by a plane bending fatigue *** the case of SLP,both the impact induced by laser ablation(LA)and that caused by laser cavitation(LC),which developed after LA,were *** the present study,the fatigue life at a constant bending stress was examined to determine the suitable *** was found that the fatigue strengths at N=10^(7)for the SLP,CP,and SP specimens treated by each optimum condition were 56%,18%,and 16%higher,respectively,than that of the non-peened(NP)specimen,which was 97 *** key factors in the improvement of fatigue strength by peening methods were work hardening and the introduction of compressive residual stress.

关键词： Magnesium alloy Fatigue strength Laser peening Cavitation peening Shot peening

Current Ramp-up by Microwave Power in the LATE Device

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Plasma Science and Technology 2009年第4期11卷 394-396页

作者： Takashi MAEKAWA hitoshi TANAKA Masaki UCHIDA Graduate School of Energy Science Kyoto University

In the low aspect ratio torus experiment （LATE） device, plasma current is initiated and ramped up to 20 kA solely by microwave power at the electron cyclotron （EC） range of frequency with a ramp of the external vertical field By for the radial equilibrium of plasma torus at larger currents. Measurements suggest that an energetic electron tail in the energy range of about 200 keV carries the current. The line averaged electron density is higher than the plasma cutoff density, suggesting that tail electrons might be driven by electron Bernstein waves modeconverted from the launched electromagnetic waves.

关键词： current ramp-up microwave electron cyclotron range of frequency

Evidence of spin density wave of CeOs4Sb12

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Rare Metals 2006年第S1期25卷 550-552页

作者： IWASA Kazuaki SUGAWARA hitoshi SATO Hideyuki Department of Physics Tohoku University Sendai 980-8578 Japan Department of Physics Tokyo Metropolitan University Tokyo 192-0397 Japan

Elastic neutron diffraction measurements were performed on single crystals to study the ground state below the mysterious exotic transition temperature 0.86 K. An antiferromagnetic order with a tiny moment of 0.027 μB per formula is formed as the ground state for CeOs4Sb12 below the transition point. Our neutron data gives the evidence of spin density wave state for CeOs4Sb12 in this work.

关键词： elastic neutron scattering skutterudite structure antiferromagnetic ordering spin density wave

Structure of polyelectrolyte brushes studied by coarse grain simulations

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Friction 2014年第1期2卷 73-81页

作者： hitoshi WASHIZU Tomoyuki KINJO Hiroaki YOSHIDA Toyota Central R&D Labs. Inc.41-1 YokomichiNagakuteAichi 480-1192Japan Elements Strategy Initiative for Catalysts and Batteries Kyoto UniversityKatsuraKyoto 615-8520Japan

As an example of a very low friction system,Monte Carlo Brownian dynamics simulations have been used to calculate equilibrium structures of a polyelectrolyte brush grafted onto *** polymers were calculated in a semi-flexible coarse-grain model that is appropriate to treat the charge density of the *** effect of linear charge density on the polyionx,the surface negative charge,and added salts were *** salt-free solution,scaling theories predicted the structure well in the *** the highxregion,additional shrinkage was found from the theories due to counterion *** effect of surface charge showed not only the repulsion of the polyion from the surface but also the shrinkage in the highxregion due to the additional counterions required for electrical *** addition of salts led to the shrinkage of the brush heights,and in the highxregion,additional extension was *** computational strategy for calculating the friction dynamics of the system is also discussed.

关键词： polyelectrolyte brush friction Monte Carlo Brownian dynamics simulation soft materials automotive tribology

Metabolism and Long-distance Translocationof Cytokinins

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Journal of Integrative Plant Biology 2010年第1期52卷 53-60页

作者： Toru Kudo Takatoshi Kiba hitoshi Sakakibara RIKEN Plant Science Center

During plant development, distantly-located organs must communicate in order to adapt morphological and physiological features in response to environmental inputs. Among the recognized signaling molecules, a class of phytohormones known as the cytokinins functions as both local and long-distance regulatory signals for the coordination of plant development. This cytokinin-dependent communication system consists of orchestrated regulation of the metabolism, translocation, and signal transduction of this phytohormone class. Here, to gain insight into this elaborate signaling system, we summarize current models of biosynthesis, transmembrane transport, and long-distance translocation of cytokinins in higher plants.

关键词： Metabolism and Long-distance Translocationof Cytokinins Figure IPT Long