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水钢科技 2020年第4期 51-61页

作者： Eiji TSUCHIYA Yuta MATSUMURA yoshihiro hosoya Yuka MIYAMOTO Takashi KOBAYASHI Kazuhiro SETO Keiko TOMURA Koji INOUE Yasuyoshi NAGAI 高长益(译) 叶雅妮(译) 张东升(译) 谢祥(译) 刘立德(译) 吴学林(译) 日本特种金属有限公司新型功能材料研究开发部日本JFE钢铁公司钢铁研究实验室日本东北大学材料研究所首钢水钢制造管理部贵州六盘水553028

我们研究了Nb的加入量小于0.05 mass%时对编织针用球化处理共析钢的淬火和回火行为的影响,获得如下结果:(1)添加0.01 mass%Nb可显著提高加热硬化性;(2)与无Nb钢相比,加入0.01 mass%Nb的钢的淬火延伸率和延伸率的标准偏差均有所下降;(3)... 详细信息

我们研究了Nb的加入量小于0.05 mass%时对编织针用球化处理共析钢的淬火和回火行为的影响,获得如下结果:(1)添加0.01 mass%Nb可显著提高加热硬化性;(2)与无Nb钢相比,加入0.01 mass%Nb的钢的淬火延伸率和延伸率的标准偏差均有所下降;(3)在低温回火过程中,Nb的加入对硬度几乎没有影响,但添加0.01mas%Nb不仅能提高冲击韧性,而且能提高疲劳耐久性;(4)原子探针断层扫描(APT)分析表明,由于微量Nb的加入,碳在钢中的析出直接导致碳含量为25 at%的ε碳化物和θ碳化物的形成,但是,没有碳含量为10~15 at%的团簇的形成;(5)对于同样的P含量,当加入0.05 mass%Nb时.马氏体相中P的平均体积浓度显著增加;(6)关于低温回火马氏体的各种力学性能的最佳Nb含量,可以认为力学性能取决于正反两方面作用的平衡,正面作用是,由于Nb的加入,促进了低温回火过程中碳化物的析出,负面作用是,当加入0.02 mass%Nb时,由于增加了马氏体相中的磷的体积浓度,恶化了韧性。

关键词：高碳钢过共析钢含铌钢马氏体低温回火淬透性原子探针断层扫描

Do bosons always condense?

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National Science Review 2021年第3期8卷 10-11页

作者： yoshihiro Iwasa Quantum Phase Electronics Center (QPEC) and Department of Applied Physics The University of Tokyo RIKEN Center for Emergent Matter Science (CEMS)

We learn in elementary statistical mechanics that bosonic systems undergo a phase change even without interparticle interactions, called Bose-Einstein condensation (BEC). Indeed, almost all bosonic systems in the real world such as4He, cold atoms and photons, exhibit BEC, and even electrons, a representative fermion system, can show similar condensation and superconductivity through the Cooper pair formation.

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A Note on Besov-Morrey Spaces and Triebel-Lizorkin-Morrey Spaces

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Acta Mathematica Sinica,English Series 2009年第8期25卷 1223-1242页

作者： yoshihiro SAWANO Department of Mathematics Gakushuin University

In the present paper, we obtain three independent results on the Besov-Morrey spaces and the Triebel-Lizorkin-Morrey spaces. That is, we are going to obtain the characterization of local means, the boundedness of pseudo-differential operators and the characterization of the Hardy-Morrey spaces. By using the maximal estimate and the molecular decomposition, we shall integrate and extend the known results on these spaces.

关键词： function spaces pseudo-differential operators Hardy spaces

A study of Corrosion Protection of Aluminum Metal by Tetraethoxysilane Plasma Polymerized Coatings -Influence of Aluminum Surface Pretreatments-

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材料热处理学报 2004年第05B期25卷 1325-1328页

作者： yoshihiro Motnose Tatsuya Yabuki Department of Materials Science Ibaraki University Hitachi Ibaraki 316-8511 JapanDepartment of Materials Science Ibaraki University Hitachi Ibaraki 316-8511 Japan

The corrosion-protective performance of plasma-polymerized (PP) coatings on pretreated aluminum substrates has been investigated by cathodic polarization curve measurement. The surface composition and electronic properties of the pretreated and PP film coated metal surfaces were also characterized by XPS and the temperature-programmed photoelectron emission (TPPE). A PP coating was prepared on the pretreated surfaces by plasma polymerization of a mixture of tetraethoxysilane (TEOS) monomer vapor and oxygen using a 13.56MHz radiofrequency generator. The polarization curve of PP film coated samples was measured in NaCl aqueous solution. The weight loss rate calculated from the value of the corrosion current of the curve was used to estimate the protective performance of the PP film coated samples. Argon plasma treatment of the metal surface gave much better corrosion-protective performance than pretreatments such as oxidation by heating in air and diamond scratching. The XPS analysis indicated that the silicon oxide assigned to SiO2 was formed on the PP film coated surface. The TPPE analysis revealed that the electron emission characteristics for the metal surfaces pretreated only were strongly influenced by the pretreatments, while all the PP film coated samples exhibited nearly the same electron emission trend with a much decreased intensity.

关键词：防腐蚀等离子聚合铝四乙氧基甲硅烷 TPPE 极化曲线

A predual of a predual of B_σ and its applications to commutators

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Science China Mathematics 2018年第8期61卷 1437-1472页

作者： yoshihiro Sawano Hiroko Yoshida Department of Mathematics and Information Science Tokyo Metropolitan University

A predual of B_σ-spaces is investigated. A predual of a predual of B_σ-spaces is also investigated,which can be used to investigate the boundedness property of the commutators. The relation between Herz spaces and local Morrey spaces is discussed. As an application of the duality results, one obtains the boundedness of the singular integral operators, the Hardy-Littlewood maximal operators and the fractional integral operators, as well as the commutators generated by the bounded mean oscillation(BMO) and the singular integral *** is new in this paper is that we do not have to depend on the specific structure of the operators. The results on the boundedness of operators are formulated in terms of B_σ-spaces and B_σ-spaces together with the detailed comparison of the ones in Herz spaces and local Morrey spaces. Another application is the nonsmooth atomic decomposition adapted to B_σ-spaces.

关键词： B_σ-spaces duality decomposition Herz spaces local Morrey spaces

Visible light-curable polymers for biomedical applications

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Science China Chemistry 2014年第4期57卷 510-521页

作者： ZHOU Di ITO yoshihiro Emergent Bioengineering Materials Research Team RIKEN Center for Emergent Matter Science Jiangsu Key Laboratory of Advanced Functional Materials School of Chemistry and Material EngineeringChangshu Institute of Technology

Photocurable systems, which offer advantages such as microfabrication and in situ fabrication, have been widely used as dental restorative materials. Because the visible light-curable(VLC) system causes no biological damage, it is popular as a dental material and is being investigated by many researchers for other medical applications. Here, the principle of the VLC system is explained and recent progress in key components including photoinitiators, monomers, macromers, and prepolymers is discussed. Finally, biomedical applications for drug delivery and soft tissue engineering are reviewed. Considering the recent development of VLC systems, its importance in the field of medical applications is expected to continue to increase in the future.

关键词： visible light photocuring photoinitiator polymer biomedicine

Prediction of the Curie temperature considering the dependence of the phonon free energy on magnetic states

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npj Computational Materials 2020年第1期6卷 140-146页

作者： Tomonori Tanaka yoshihiro Gohda Department of Materials Science and Engineering Tokyo Institute of TechnologyYokohama 226-8502Japan

Prediction of the Curie temperature is of significant importance for the design of ferromagnetic *** of the most widely used methods to estimate the Curie temperature from first principles relies on a spin Hamiltonian,for example,the Heisenberg Hamiltonian,and exchange coupling parameters obtained by first-principles calculations at zero *** though there have been attempts to include the effects of magnetism on phonons,the influence of magnetism-dependent phonons on magnetism has been disregarded in the theoretical estimation of the Curie ***,we propose a first-principles thermodynamic approach to minimise the total free energy considering both the influences of magnetism on phonons and the feedback effect from phonons to *** applying our scheme to body-centered cubic Fe,we find a significant reduction of the Curie temperature due to the feedback *** result indicates the importance of the feedback effect for a quantitative description of finite-temperature *** addition,we point out that the reduction in the theoretical Curie temperature arises in a wide range of ferromagnetic materials that exhibit phonon softening due to magnetic disordering.

关键词： temperature effect phonon

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

Alternating minimization for data-driven computational elasticity from experimental data: kernel method for learning constitutive manifold

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Theoretical & Applied Mechanics Letters 2021年第5期11卷 260-265页

作者： yoshihiro Kanno Mathematics and Informatics Center The University of TokyoHongo 7-3-1Tokyo 113-8656Japan

Data-driven computing in elasticity attempts to directly use experimental data on material,without constructing an empirical model of the constitutive relation,to predict an equilibrium state of a structure subjected to a specified external *** that a data set comprising stress-strain pairs of material is available,a data-driven method using the kernel method and the regularized least-squares was developed to extract a manifold on which the points in the data set approximately lie(Kanno 2021,***.).From the perspective of physical experiments,stress field cannot be directly measured,while displacement and force fields are *** this study,we extend the previous kernel method to the situation that pairs of displacement and force,instead of pairs of stress and strain,are available as an input data set.A new regularized least-squares problem is formulated in this problem setting,and an alternating minimization algorithm is proposed to solve the problem.

关键词： Alternating minimization Regularized least-squares Kernel method Manifold learning Data-driven computing