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Photocatalytic dry reforming of methane by rhodium supported monoclinic TiO_(2)-B nanobelts

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Journal of Energy Chemistry 2022年第8期31卷 562-571,I0015页

作者： Masaru Kushida Akira Yamaguchi Masahiro miyauchi School of Materials and Chemical Technology Tokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo 152-8552Japan

The conversion of methane and carbon dioxide into syngas(dry reforming of methane;DRM)has attracted attention owing to the potential to reuse greenhouse *** dioxide(TiO_(2))-based photocatalysts,which have been widely commercialized owing to their high efficiency,non-toxicity,and low cost,are strongly desired in ***,we report a monoclinic-phase TiO_(2)-B nanobelts-supported rhodium(Rh/TiO_(2)-B nanobelts)catalyst that efficiently promotes DRM under ultraviolet light irradiation at low *** holes in the TiO_(2)-B nanobelts were used to oxidize methane,while the electrons were trapped in rhodium to reduce carbon ***/TiO_(2)-B nanobelts exhibited considerably higher durability and activity than Rh-loaded conventional TiO_(2)(anatase and rutile),owing to the lattice and/or surface oxygen reactivity in TiO_(2)-B nanobelts,which was suggested by X-ray photoelectron spectroscopy measurements and photocatalytic performance tests under an atmosphere of methane *** study paves the path for the effective utilization of methane by constructing active TiO_(2)-based nanometal photocatalysts.

关键词： Photocatalysis Dry reforming of methane Greenhouse gas conversion Gas-phase reaction Titanium dioxide TiO_(2)-B

Linear Stability Analysis on the Influences of the Spatial Variations in Thermal Conductivity and Expansivity on the Flow Patterns of Thermal Convection with Strongly Temperature-Dependent Viscosity

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Journal of Earth Science 2014年第1期25卷 126-139页

作者： Arata miyauchi Masanori Kameyama Hiroki Ichikawa Geodynamics Research Center Ehime University

A series of linear stability analysis is carried out on the onset of thermal convection in the presence of spatial variations of viscosity, thermal conductivity and expansivity. We consider the temporal evolution of an infinitesimal perturbation superimposed to a static （motionless） and con- ductive state in a basally-heated planar layer. From the changes in flow patterns with increasing the amplitudes of temperature dependence of viscosity, we identified the transition into the ＂stagnant-lid＂（ST） regime, where the convection occurs only beneath a thick and stagnant-lid of cold fluid at the top surface. Detailed analysis showed a significant increase of the aspect ratio of convection cells in ST regime induced by the spatial variations in thermal conductivity and/or expansivity： the horizon- tal length scale of ST convection can be enlarged by up to 50% with 10 times increase of thermal conductivity with depth. We further developed an analytical model of ST convection which success- fully reproduced the mechanism of increasing horizontal length scale of ST regime convection cells for given spatial variations in physical properties. Our findings may highlight the essential roles of the spatial variation of thermal conductivity on the convection patterns in the mantle.

关键词： mantle convection stagnant-lid temperature-dependent viscosity pressure- dependent thermal conductivity pressure-dependent thermal expansivity linear stability analysis.

Is germinal center selection required for influenza vaccination?

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Cellular & Molecular Immunology 2017年第8期14卷 655-657页

作者： Kosuke miyauchi Masato Kubo Laboratory for Cytokine Regulation Research Center for Integrative Medical Science(IMS)RIKEN Yokohama InstituteYokohamaKanagawa 230-0045Japan Division of Molecular Pathology Research Institute for Biomedical ScienceTokyo University of ScienceNodaChiba 278-0022Japan

It has long been believed that the generation of high-affinity neutralizing antibodies is critical for antiviral humoral *** production of high-affinity antibodies depends on the formation of germinal centers(GC)in ly... 详细信息

关键词： centers center neutral

Vulnerable atherosclerotic plaque features:findings from coronary imaging

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Journal of Geriatric Cardiology 2021年第7期18卷 577-584页

作者： Osamu Kurihara Masamichi Takano Yasushi miyauchi Kyoichi Mizuno Wataru Shimizu Cardiovascular Center Chiba Hokusoh HospitalNippon Medical SchoolChibaJapan Mitsukoshi Health and Welfare Foundation TokyoJapan Division of Cardiology Nippon Medical SchoolTokyoJapan

Pathological studies have suggested that features of vulnerable atherosclerotic plaques likely to progress and lead to acute cardiovascular events have specific *** the progress of intravascular coronary imaging technology,some large prospective studies have detected features of vulnerable atherosclerotic plaques using these imaging ***,the rate of cardiovascular events,such as acute coronary syndrome,has been found to be considerably reduced in the limited follow-up period available in the statin ***,not all disrupted plaques lead to thrombus formation with clinical *** sub-occlusive or occlusive thrombus formation does not occur,a thrombus on a disrupted plaque will organize without any symptoms,forming a"healed plaque".Although vulnerable plaque detection using intracoronary imaging is focused on"thin-cap fibroatheroma"leading to plaque rupture,superficial plaque erosion is increasingly recognized;however,the underlying mechanism of thrombus formation on eroded plaques is not well *** of intravascular imaging,optical coherence tomography(OCT)has the highest image resolution and has enabled detailed characterization of the plaque in ***,we reviewed the status and limitations of intravascular imaging in terms of detecting vulnerable plaque through mainly OCT *** suggested that vulnerable plaque should be reconsidered in terms of eroded plaque and healed plaque and that both plaque and circulating blood should be assessed in greater detail accordingly.

关键词： coronary acute superficial

High-Speed Optical Local Access Network System Using Bi-Directional Polarization Multiplexing

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光学学报 2003年第S1期23卷 735-736页

作者： Mitsuru miyauchi Yanjun Sun Department of Network Science Chiba Institute of Technology JapanGraduate School of Information Systems The University of Electro-Communications Japan

A high-speed and economical optical local access network system is proposed where bi-directional polarization multiplexing is applied to a bi-directional transmission. Experimental results using a prototype system con... 详细信息

关键词： that in or of In FTP Figure High-Speed Optical Local Access Network System Using Bi-Directional Polarization Multiplexing

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萨塔玛活动中心芬兰科特卡

世界建筑导报 2024年第2期39卷 77-81页

作者： Juho Grönholm Antti Nousjoki Samuli Woolston Sampo Honkala Chris Morris Ricardo Cruz Recalde Mirja Sillanpää Niklas Mahlberg Thomas miyauchi Stephanie Polochowitz Tuomas Uusheimo(摄影) ALA建筑师事务所不详

新开业的萨塔玛活动中心位于科特卡市最古老的港口坎塔萨塔玛,距离著名的维拉莫海事中心(已在港口区立足15年)只有几步之遥。该活动中心与目前正在建设的芬兰东南应用科技大学新校区大楼和未来酒店位于同一地块。这三座新建筑将有助于... 详细信息

新开业的萨塔玛活动中心位于科特卡市最古老的港口坎塔萨塔玛,距离著名的维拉莫海事中心(已在港口区立足15年)只有几步之遥。该活动中心与目前正在建设的芬兰东南应用科技大学新校区大楼和未来酒店位于同一地块。这三座新建筑将有助于加强港口与城市中心之间的视觉和功能联系。该活动中心是举办各种文化、体育和商务活动的理想场所。ALA建筑师事务所的设计工作侧重于将极具吸引力的建筑与功能性和环境目标相结合。其建筑特征来源于环境和项目目标。

关键词：活动中心建筑师事务所大学新校区港口区科特萨塔功能性芬兰

Biomimetic Riblets Inspired by Sharkskin Denticles： Digitizing, Modeling and Flow Simulation

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Journal of Bionic Engineering 2018年第6期15卷 999-1011页

作者： Mariko Miyazaki Yuji Hirai Hiroshi Moriya Masatsugu Shimomura Akihiro miyauchi Hao Liu Hitachi Ltd. 832-2 Horiguchi Hitachinaka Ibaraki 312-0034 Japan Chitose Institute of Science and Technology 758-65 Bibi Chitose Hokkaido 066-8655 Japan Tokyo Medical Dental University 2-3-10 Kanda-Surugadai Chiyodaku Tokyo 101-0062 Japan Chiba University 1-33 Yayoi-cho Inage-ku Chiba 263-8522 Japan

While sharkskin surface roughness in terms of denticle morphology has been hypothesized but remains yet controversial to be capable of achieving turbulent flow control and drag reduction, sharkskin-inspired ＂riblets＂ have been reported to be an effective biomimetic design. Here we address an integrated study of biomimetic riblets inspired by sharkskin denticles by combining 3D digitizing and mod- eling of＂fresh＂ denticles and computational fluid dynamic modeling of turbulent flows on a rough surface with staggered denticles and hound-tooth-patterned grooves. Realistic microstructures of denticles in five shark species of Galapagos, great white, whitetip reef, blacktip reef, and hammerhead sharks were first measured and digitized in three fold：（1） 2D imaging of lubricated sharkskin in a wet state by means of a ＂nano-suit＂ technique with a Field-Emission Scanning Electron Microscope （FE-SEM）; （2） 3D structures of sharkskin denticles with a micro-focus X-ray CT; and （3） single denticles of the five shark species in a 3D manner with 3D-CAD. The denticles at mid-body location in the five species were observed to have a structure of five non-uniform-ridges （herein termed ＂non-uniform grooves＂） with Angles Of Inclination （AOI） ranging over 20° - 32°. Hydrodynamics associated with the unique five-ridge denticles were then in- vestigated through modeling turbulent flow past a denticle-staggered skin surface. We further constructed a biomimetic riblet model inspired by the non-uniform grooves and investigated the hydrodynamic effects of height-to-spacing ratios of mid-ridge and side-ridges. Our results indicate that the morphological non-uniformity in sharkskin denticles likely plays a critical role in passively controlling local turbulent flow and point to the potential of denticle-inspired biomimetic riblets for turbulent-flow control in aquatic vehicles as well as other fluid machinery.

关键词： sharkskin denticles biommetic riblets 3D digitizing computational fluid dynamics

Recent update on electrochemical CO_(2)reduction catalyzed by metal sulfide materials

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Materials Reports(Energy) 2023年第2期3卷 103-123,I0003页

作者： An Niza El Aisnada Masahiro miyauchi Min Liu Akira Yamaguchi Department of Materials Science and Engineering School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo152=8552Japan Biofunctional Catalyst Research Team RIKEN Center for Sustainable Resource Science2=1 HirosawaWakoSaitama351-0198Japan Hunan Joint International Research Center for Carbon Dioxide Resource Utilization State Key Laboratory of Powder MetallurgySchool of Physical and ElectronicsCentral South UniversityChangsha410083China

Seeking and developing efficient CO_(2)reduction reaction(CO_(2)RR)electrocatalysts is a hot topic in this era of global *** material candidates for sustainable and cost-effective applications,metal sulfides have attracted attention as promising nature-inspired materials due to multiple adsorption sites which are enhanced by the covalent character of *** article summarizes the current status regarding the utilization and development of metal sulfide materials as CO_(2)RR ***,the research background and basic principles of electrochemical CO_(2)RR are ***,an overview of the main obstacles to developing efficient CO_(2)RR electrocatalysts is *** section is followed by a summary of the empirical evidence supporting the application of metal sulfides as CO_(2)RR electrocatalysts beside nature-inspired *** summary of synthesis methods of various metal sulfides is also ***,the paper also highlights the recent works on metal sulfide as efficient CO_(2)RR including the undertaking strategy on the activity enhancement,and finally,discusses the challenges and prospect of metal sulfides-based CO_(2)RR *** recent efforts,metal sulfides remain relatively unexplored as materials for CO_(2)RR electrocatalytic ***,this review aims to stimulate novel ideas and research for improved catalyst designs and functionality.

关键词： Metal sulfides Electrocatalyst Electrochemical CO_(2)reduction Bi-metal sulfides Active site Defect engineering Selectivity Faradaic efficiency

Rayleigh scattering studies on inter-layer interactions in structure-defined individual double-wall carbon nanotubes

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Nano Research 2014年第10期7卷 1548-1555页

作者： Sihan Zhao Tomoya Kitagawa Yuhei miyauchi Kazunari Matsuda Hisanori Shinohara Ryo Kitaura Department of Chemistry & Institute forAdvanced Research Nagoya University Nagoya 464-8502 Japan Institute of Advanced Energy Kyoto University Uji Kyoto 511-0011 Japan Japan Science and Technology Agency PRESTO Saitama 332-0012 Japan

Although the inter-layer coupling in layered materials has attracted considerable interest due to its importance in determining physical properties of two- dimensional systems, studies on the inter-layer coupling in one-dimensional systems have so far been limited. Double-wall carbon nanotubes （DWCNTs） are one of the most fundamental and ideal model systems to study the interqayer coupling in one-dimensional systems. In this work, Rayleigh scattering spectroscopy and transmission electron microscopy are used to characterize the electronic transition between inner-and outer-nanotubes of the exactly same individual DWCNT. We find that the interqayer coupling is strong, leading to downshifts in most of the optical transition energies （up to -0.2 eV） compared to isolated CNTs. We also find that the presence of metallic tubes lead to stronger shifts. The inter-layer screening of Coulomb interactions is one of the key factors in explaining the observed results.

关键词： inter-layer coupling one-dimensional system electronic properties double-wall carbonnanotubes (DWCNTs) dielectric screening