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Effects of soil profile and characteristic of exciting force on propagation of ground vibrations

Journal of Modern Transportation 2012年第3期20卷 129-137页

作者： Sunao KUNIMATSU yoshihiro hirao Yasutoshi KITAMURA Institute for Geo-Resources and Environment National Institute of Advanced Industrial Science and Technology1-1-1 Higashi Tsukuba Ibaraki 305-8567 Japan Kobayashi Institute of Physical Research 3-20-41 Higashi-Motomachi Kokubunji Tokyo 185-0020 Japan Construction Engineering Research Institute Foundation 1-3-10 Turukabuto Nada-ku Kobe Hyogo 657-0011 Japan

Ground-borne vibrations caused by vibration sources such as road traffic and construction exhibit complicated properties during propagation from the vibration source to the inside of a building. In the present paper, a numerical analysis technique for the system of vibration source and propagation path of ground vibration is developed in order to systematically determine the propagation properties of the vibration as part of developing a predictive technique for exposure evaluations by vibrations in three directions at receiving points of vibration in the human body. First, the exciting forces in three directions for input into the numerical computation are inversely-estimated by using the measured acceleration rec- ords of the measurement points, which are near the vibration source. The thin-layered element method is used for numerical computation of the ground vibration. Then, the calculation results for the ground vibration obtained by using the estimated exciting force are compared with the measured results, and the influence of the stratified structure of the ground on the exciting force and the propagation properties of the ground vibration are studied. From these results, in a prediction of the ground vibration in three directions, it is emphasized that it is necessary to consider the influence of horizontal exciting force, although attention has been paid to only the vertical exciting force for simulating ground vibration.

关键词： ground-borne vibration vibration source exciting force stratified structure soil profile

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Fabrication of Micro -Optical Devices by a Femtosecond Laser

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光学学报 2003年第S1期23卷 825-826页

作者： Kazuyuki hirao Graduate School of Engineering Kyoto University Japan

Femtosecond laser is a perfect laser source for materials processing when high accuracy and small structure size are required. Due to the ultra short interaction time and the high peak power, the process is generally characterized by the absence of heat diffusion and, consequently molten layers. Various induced structures have been observed in materials after the femtosecond laser irradiation. Here, we report on fabrication of micro-optical devices by the femtosecond laser. 1) formation of optical waveg...

关键词： by on in as of Optical Devices by a Femtosecond Laser Fabrication of Micro

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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

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Contracted interlayer distance in graphene/sapphire heterostructure

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Nano Research 2015年第5期8卷 1535-1545页

作者： Shiro Entani Liubov Yu. Antipina Pavel V. Avramov Manabu Ohtomo yoshihiro Matsumoto Norie hirao Iwao Shimoyama Hiroshi Naramoto Yuji Baba Pavel B. Sorokin Seiji Sakai Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan Technological Institute for Superhard and Novel Carbon Materials Troitsk Moscow 142190 Russia Moscow Institute of Physics and Technology Dolgoprudny Moscow 141700 Russia Siberian Federal University 79 Svobodniy pr. Krasnoyarsk 660041 Russia Ouantum Beam Science Directorate Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan National University of Science and Technology MISiS Moscow 119049 Russia

Direct growth of graphene on insulators is expected to yield significant improvements in performance of graphene-based electronic and spintronic devices. In this study, we successfully reveal the atomic arrangement and electronic properties of a coherent heterostructure of single-layer graphene and α-Al2O3（0001）. The analysis of the atomic arrangement of single-layer graphene on α-Al2O3（0001） revealed an apparentcontradiction. The in-plane analysis shows that single-layer graphene grows not in a single-crystalline epitaxial manner, but rather in polycrystalline form, with two strongly pronounced preferred orientations. This suggests relatively weak interfacial interactions are operative. However, we demonstrate that unusually strong physical interactions between graphene and α-Al2O3（0001） exist, as evidenced by the small separation between the graphene and the α-Al2O3（0001） surface. The interfacial interaction is shown to be dominated by the electrostatic forces involved in the graphene n-system and the unsaturated electrons of the topmost O layer of α-Al2O3（0001）, rather than the van der Waals interactions. Such features causes graphene hole doping and enable the graphene to slide on the α-Al2O3（0001） surface with only a small energy barrier despite the strong interfacial interactions.

关键词： graphene sapphire chemical vapor deposition graphene/insulator interface

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Synchrotron radiation studies of the orientation of thin silicon phthalocyanine dichloride film on HOPG substrate

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Chinese Physics C 2008年第9期32卷 769-772页

作者：邓居智陈荣 SEKIGUCHI Tetsuhiro BABA Yuji hirao Norie HONDA Mitsunori Key Laboratory of Nuclear Resources and Environment (East China Institute of Technology) Ministry of Education Synchrotron Radiation Research Center Japan Atomic Energy Agency

Thin silicon phthalocyanine dichloride films on HOPG were prepared and the sample was heated in the vacuum with laser. The thickness of the thin sample on HOPG was checked by X-ray photoemission spectroscopy. The orientation of the molecules in respect to the substrate plane was investigated by measuring the silicon K-edge near edge X-ray absorption fine structure （NEXAFS）. In the NEXAFS spectra of the thin sample, two clear peaks which were assigned to Is → σ^＊Si-N and 1s→ σ^＊Si-Cl appeared around 1847.2 eV and 1843.1 eV respectively. The intensities of the resonance peaks showed strong polarization dependence. A quantitative analysis of the polarization dependence revealed that the Si-N bond tended to lie down while the Si-Cl bond was out of the molecular plane.

关键词： near edge X-ray absorption fine structure (NEXAFS) orientation silicon phthalocyanine dichloride polarization dependence

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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

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Body Extension by Using Two Mobile Manipulators

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Cyborg and Bionic Systems 2023年第1期4卷 418-426页

作者： Yusuke hirao Weiwei Wan Dimitrios Kanoulas Kensuke Harada Graduate School of Engineering Science Osaka UniversityOsakaJapan Department of Computer Science University College LondonLondonUK

This paper presents a remotely operated robotic system that includes two mobile manipulators to extend the functional capabilities of a human *** with previous tele-operation or robotic body extension systems,using two mobile manipulators helps with enlarging the workspace and allowing manipulation of large or long *** system comprises a joystick for controlling the mobile base and robotic gripper,and a motion capture system for controlling the arm *** together enable tele-operated dual-arm and large-space *** the experiments,a human tele-operator controls the two mobile robots to perform tasks such as handover,long object manipulation,and cooperative *** results demonstrated the effectiveness of the proposed system,resulting in extending the human body to a large space while keeping the benefits of having two limbs.

关键词： system Extension enable

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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

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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

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