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Round Robin Study on the Thermal Conductivity/Diffusivity of a Gold Wire with a Diameter of 30μm Tested via Five Measurement Methods

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Journal of Thermal Science 2022年第4期31卷 1037-1051页

作者： ABE Ryo SEKIMOTO Yuki SAINI Shirkant MIYAZAKI Koji LI Qin-Yi LI Dawei takahashi Koji YAGI Takashi NAKAMURA Masakazu division of materials science nara institute of science and technologyikoma 630-0192japan department of mechanical and control engineering kyushu institute of technologykitakyushu 804-8550japan department ofaeronautics and astronautics kyushu universityfukuoka819-0395japan international institute for carbon-neutral energy research(wpi-i2cner) kyushu universityfukuoka 819-0395japan national metrology institute of japan national institute of advanced industrial science and technology tsukuba 305-8565japan

Since first establishing thermal measurement techniques for micrometer-scale wires,various methods have been devised and improved upon.However,the uncertainty of different measurements on the same sample has not yet been discussed.In this work,a round robin test was performed to compare the thermal conductivity and thermal diffusivity measurement methods for a fine metal wire.The tested material was a pure gold wire,with a diameter of 30μm.The wire was cut into certain lengths and distributed to four institutions using five different measurement methods:the direct current(DC)self-heating method,the DC heating T-type method,the 3ωmethod for thermal conductivity,the scanning laser heating alternating current(AC)method,and the spot periodic heating radiation thermometry method for thermal diffusivity.After completing the measurements,the reported thermal conductivity and thermal diffusivity at room temperature,i.e.,317 W·m^(-1)·K^(-1)and 128×10^(-6)m^(2)·s^(-1),respectively,were adopted as references for comparison with the measurement results.The advantages and disadvantages of each method are described in terms of the effect of electrical and thermal junctions fabricated on a wire,such as an electrode,a thermocouple,and a heat bath.The knowledge obtained from the tested methods will be useful for selecting and designing a measurement technique for various wire-like materials.

关键词： thermal conductivity thermal diffusivity round robin test microscale wire

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Stem cell-derived exosomes as a therapeutic tool for cardiovascular disease

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World Journal of Stem Cells 2016年第9期8卷 297-305页

作者： Etsu Suzuki Daishi Fujita Masao takahashi Shigeyoshi Oba Hiroaki Nishimatsu Institute of Medical Science St. Marianna University School of Medicine Department of Internal Medicine Faculty of Medicine University of Tokyo Department of Urology Faculty of MedicineUniversity of Tokyo

Mesenchymal stem cells(MSCs) have been used to treat patients suffering from acute myocardial infarction(AMI) and subsequent heart failure. Although it was originally assumed that MSCs differentiated into heart cells such as cardiomyocytes, recent evidence suggests that the differentiation capacity of MSCs is minimal and that injected MSCs restore cardiac function via the secretion of paracrine factors. MSCs secrete paracrine factors in not only naked forms but also membrane vesicles including exosomes containing bioactive substances such as proteins, messenger RNAs, and microR NAs. Although the details remain unclear, these bioactive molecules are selectively sorted in exosomes that are then released from donor cells in a regulated manner. Furthermore, exosomes are specifically internalized by recipient cells via ligand-receptor interactions. Thus, exosomes are promising natural vehicles that stably and specifically transport bioactive molecules to recipient cells. Indeed, stem cell-derived exosomes have been successfully used to treat cardiovascular disease(CVD), such as AMI, stroke, and pulmonary hypertension, in animal models, and their efficacy has been demonstrated. Therefore, exosome administration may be a promising strategy for the treatment of CVD. Furthermore, modifications of exosomal contents may enhance their therapeutic effects. Future clinical studies are required to confirm the efficacy of exosome treatment for CVD.

关键词： Exosomes Messenger RNA Cardiovascular disease Mesenchymal stem cells Stem cells MicroRNA

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Charge and Heat Transport in Polycrystalline Metallic Nanostructures

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Chinese Physics Letters 2008年第9期25卷 3360-3363页

作者：张兴 takahashi Koji FUJII Motoo Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing 100084 Graduate School of Engineering Kyushu University Fukuoka 819-0395 Japan Research Center for Hydrogen Industrial Use and Storage AIST Fhkuoka 819-0395 Japan

金属典型地是搬运充电并且搬运热的能力能通过 Wiedemann-Franz 法律是相关的好在导体。这里，我们在搬运充电的能力比那更显然在被削弱搬运热的多晶的金属性的 nanostructures 在反常费用和热运输上报导。我们把它归因于内部谷物边界... 详细信息

金属典型地是搬运充电并且搬运热的能力能通过 Wiedemann-Franz 法律是相关的好在导体。这里，我们在搬运充电的能力比那更显然在被削弱搬运热的多晶的金属性的 nanostructures 在反常费用和热运输上报导。我们把它归因于内部谷物边界的影响并且提出了一种新奇关系预言热传导性。Wiedemann-Franz 法律然后被修改与现在与测量结果同意很好的预言说明对起诉和热运输的谷物边界的影响。[从作者抽象]

关键词：多晶金属纳米结构热传递导电性

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Diffusion-weighted MRI in abdominal oncology:Clinical applications

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World Journal of Gastroenterology 2010年第7期16卷 832-836页

作者： Reiji Sugita Kei Ito Naotaka Fujita Shoki takahashi Department of Radiology Sendai City Medical CenterSendai 983-0824Japan Department of Gastroenterology Sendai City Medical CenterSendai 983-0824Japan Department of Diagnostic Radiology Graduate School of MedicineTohoku UniversitySendai 980-8574Japan

Diffusion-weighted magnetic resonance imaging(DWI) provides image contrast that is different from that obtained by conventional magnetic resonance techniques.Although previously,DWI has been used to evaluate various diseases of the central nervous system,several technical advances have expanded the clinical applications of DWI beyond the central nervous system.As a result,many reports have been published on the use of DWI in abdominal diseases.Particularly,abdominal DWI has now being focused on evaluation of patients with abdominal cancer.DWI can be used for pretreatment tumor detection,characterization including predicting tumor response to therapy,monitoring tumor response during therapy,and follow-up study after treatment to detect possible tumor recurrence.

关键词： Diffusion weighted magnetic resonance imaging Abdominal neoplasms

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Identification of sources of lead in the atmosphere by chemical speciation using X-ray absorption near-edge structure(XANES) spectroscopy

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Journal of Environmental Sciences 2014年第2期26卷 343-352页

作者： Kohei Sakata Aya Sakaguchi Masaharu Tanimizu Yuichi Takaku Yuka Yokoyama Yoshio takahashi Department of Earth and Planetary Systems Science Hiroshima University Kochi Institute for Core Sample Research Japan Agency for Marine-Earth Science and Technology Institute for Environmental Sciences

Sources of Pb pollution in the local atmosphere together with Pb species, major ions, and heavy metal concentrations in a size-fractionated aerosol sample from Higashi-Hiroshima （Japan） have been determined by X-ray absorption near-edge structure （XANES） spectroscopy, ion chromatography, and ICP-MS/AES, respectively. About 80% of total Pb was concentrated in fine aerosol particles. Lead species in the coarse aerosol particles were PbC204, 2PbCO3-Pb（OH）2, and Pb（NO3）2, whereas Pb species in the fine aerosol particles were PbC204, PbSO4, and Pb（NO3）2. Chemical speciation and abundance data suggested that the source of Pb in the fine aerosol particles was different from that of the coarse ones. The dominant sources of Pb in the fine aerosol particles were judged to be fly ash from a municipal solid waste incinerator and heavy oil combustion. For the coarse aerosol particles, road dust was considered to be the main Pb source. In addition to Pb species, elemental concentrations in the aerosols were also determined. The results suggested that Pb species in size-fractionated aerosols can be used to identify the origin of aerosol particles in the atmosphere as an alternative to Pb isotope ratio measurement.

关键词： lead lead speciation XAFS spectroscopy size-fractionated aerosol sample

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Foreword for the special issue of the 7th China-Japan bilateral symposium on high temperature strength of materials

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Acta Metallurgica Sinica(English Letters) 2011年第2期24卷 I0001-I0002页

作者： Shan-Tung TU Yukio takahashi East China University of Science and Technology Central Research Institute of Electric Power Industry

The 7th China-Japan Bilateral Symposium on High Temperature Strength of Mate- rials was held at Dalian, China, during the period August 23-27, 2010. The symposium was co-organized by the High Temperature Strength and Materials Committee, the So- ciety of Materials, Chinese Mechanical Engineering Society and the Committee on High Temperature Strength of Materials, the Society of Materials Science Japan.

关键词： 7th China-Japan bilateral symposium on high temperature strength of materials lecture Japan friendship

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Dynamic conjugate F-SHARP microscopy

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Light(Science & Applications) 2020年第1期9卷 939-946页

作者： Ioannis N.Papadopoulos Jean-Sebastien Jouhanneau Naoya takahashi David Kaplan Matthew Larkum James Poulet Benjamin Judkewitz Charite-Universitatsmedizin Berlin Einstein Center for NeurosciencesNeuroCure Cluster of ExcellenceChariteplatz 110117 BerlinGermany Max Delbruck Center for Molecular Medicine Robert-Rossle-Str.1013092 BerlinGermany Institute for Biology Humboldt UniversityChariteplatz 110117 BerlinGermany

Optical microscopy is an indispensable tool in biomedical sciences,but its reach in deep tissues is limited due to aberrations and scattering.This problem can be overcome by wavefront-shaping techniques,albeit at limited fields of view(FOVs).Inspired by astronomical imaging,conjugate wavefront shaping can lead to an increased field of view in microscopy,but this correction is limited to a set depth and cannot be dynamically adapted.Here,we present a conjugate wavefront-shaping scheme based on focus scanning holographic aberration probing(F-SHARP).We combine it with a compact implementation that can be readily adapted to a variety of commercial and home-built two-photon microscopes.We demonstrate the power of the method by imaging with high resolution over extended FOV(>80μm)deeper than 400μm inside a mouse brain through a thinned skull.

关键词： conjugate adapted overcome

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Optimization of Nonlinear Vibration Characteristics for Seismic Isolation Rubber

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Computer Modeling in Engineering & Sciences 2017年第1期113卷 1-15页

作者： A.takahashi T.Shibata K.Motoyama K.Misaji Nihon University College of Industrial TechnologyDept.of Mathematical Information EngineeringJapan. Mississippi State University U.S.A.

A method for reducing the damage to a structure caused by an earthquake namely,using laminated rubber for seismic isolation is proposed,and the vibration characteristics of the rubber(which minimizes the seismic response of the structure during an earthquake)is optimized.A method called“Equivalent Linear System using Restoring Force Model of Power Function Type”(PFT-ELS)is applied to nonlinear vibration analysis of the rubber.In that analysis,a building with 15 layers of the laminated rubber is modeled.The seismic response of the building is analyzed,and the usefulness of the laminated rubber is demonstrated by comparing the seismic responses in the cases with and without the laminated rubber.In addition,the hysteresis restoring-force characteristic of the laminated rubber,which minimizes the seismic response of the building,was optimized by using a genetic algorithm(GA).Based on these results,the optimum restoring-force characteristic for different earthquakes was determined.As a result,it was clarified that the developed optimization method can determine the vibration characteristics of the laminated rubber for minimizing the damage to the structure in the design phase.

关键词： Seismic-isolation laminated rubber high-rise-building structure PFT-ELS seismic-response analysis long-period earthquake

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Histopathology of nonalcoholic fatty liver disease/nonalcoholic steatohepatitis

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World Journal of Gastroenterology 2014年第42期20卷 15539-15548页

作者： Yoshihisa takahashi Toshio Fukusato Department of Pathology Teikyo University School of Medicine

Nonalcoholic fatty liver disease(NAFLD), a hepatic manifestation of metabolic syndrome, is the most common chronic liver disease, and the prevalence is rapidly increasing worldwide. Nonalcoholic steatohepatitis(NASH), the severe form of NAFLD, can progress to liver cirrhosis and hepatocellular carcinoma(HCC). Although noninvasive clinical scores and image-based diagnosis for NAFLD have improved, histopathological evaluation of biopsy specimens remains the gold standard for diagnosing NAFLD/NASH. Steatosis, lobular inflammation, and hepatocellular ballooning are all necessary components for the diagnosis of NASH; fibrosis is also typically observed. Other histopathological abnormalities commonly observed in NASH include hepatocellular glycogenated nuclei, lipogranulomas, and acidophil bodies. The characteristics of pediatric NAFLD/NASH differ from adult NAFLD/NASH. Specifically, steatosis and portal inflammation are more severe in pediatric NAFLD, while intralobular inflammation and perisinusoidal fibrosis are milder. Although interobserver agreement for evaluating the extent of steatosis and fibrosis is high, agreement is low for intralobular and portal inflammation. A recently reported histological variant of HCC, steatohepatitic HCC(SH-HCC), showsfeatures that resemble non-neoplastic steatohepatitis,and is thought to be strongly associated with underlying NASH.In this report,we review the histopathological features of NAFLD/NASH.

关键词： Histopathology Nonalcoholic fatty liver dis-ease N

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Axial charges of N(1535) and N(1650) in two-flavor lattice QCD

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Chinese Physics C 2009年第12期33卷 1233-1237页

作者： Toru T. takahashi Teiji Kunihiro Yukawa Institute for Theoretical Physics Kyoto University Kyoto 606-8502 Japan Department of Physics Kyoto University Kyoto 606-8502 Japan

We show the lattice QCD results on the axial charge gAN＊-N＊ of negative parity nucleon resonances, N＊（1535） and N＊（1650）, which are key clues to the chiral structure in baryon sector. The measurements are performed with up and down dynamical quarks employing the renormalization-group improved gauge action at β=1.95 and the O（a） improved clover quark action with the hopping parameters, κ=0.1375, 0.1390 and 0.1400. In order to properly separate signals of N＊（1535） and N＊（1650）, we construct 2 × 2 correlation matrices and diagonalize them. Wraparound contributions in the correlator, which can be another source of signal contaminations, are eliminated by imposing the Dirichlet boundary condition in the temporal direction. We find that the axial charge of N＊（1535） takes small values as gAN＊N＊-O（0.1）, whereas that of N＊（1650） is about 0.5, which is found independent of quark masses and consistent with the predictions by the naive nonrelativistic quark model.

关键词： axial charge chiral symmetry negative parity nucleon

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