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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

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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

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

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

Cu纳米针上电场促进C-C耦合增强CO_(2)电还原生成C_(2)产物

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Chinese Journal of Catalysis 2022年第2期43卷 519-525页

作者：李黄经纬周惠敏周亚姣胡俊华 Masahiro miyauchi 傅俊伟刘敏中南大学物理与电子学院湖南省化学能源重点实验室粉末冶金国家重点实验室湖南长沙410083 郑州大学材料科学与工程学院河南郑州450002 东京工业大学材料与化工技术学院材料与科学工程系日本东京

电催化CO_(2)减排技术利用电能将过量的CO_(2)转化为有附加值的化学品,是解决能源危机、实现碳中和的有效途径之一.电催化CO_(2)还原反应(CO_(2)RR)中的多碳产物(C_(2)),如乙烯和乙醇,因其比C1产物具有更高的能量密度和更广泛的应用而... 详细信息

电催化CO_(2)减排技术利用电能将过量的CO_(2)转化为有附加值的化学品,是解决能源危机、实现碳中和的有效途径之一.电催化CO_(2)还原反应(CO_(2)RR)中的多碳产物(C_(2)),如乙烯和乙醇,因其比C1产物具有更高的能量密度和更广泛的应用而受到较大关注.目前为止,Cu基催化剂被认为是获得C_(2)产物的独特材料.研究者在提高Cu基催化剂C_(2)产物的活性和选择性方面做了大量的工作,如催化剂形貌工程、活性位点设计和中间吸附性能调控等.许多理论和实验研究已经证明,Cu基催化剂上的C-C偶联过程是C_(2)产物生成的速率决定步骤.优化C-C偶联过程的能垒是提高C_(2)产物活性和选择性的重要而直接的策略.CO_(2)RR在Cu上是由CO_(2)还原吸附CO(*CO)并二聚生成C_(2)产物引起的.C-C偶联过程与*CO的吸附性能密切相关.众所周知,CO是一种典型的极性分子,因此其在催化剂表面的吸附性能可能会受到活性位点周围的局部电场的影响.构建合适的局部电场是调节CO吸附性能和C-C偶联过程的潜在手段之一.前期工作(Nature,2016,537,382-386)证明了高曲率金纳米针可以在尖端产生高的局部电场.高局域电场诱导K+聚集,使活性位点周围CO_(2)浓度升高,大大促进了Au纳米针上的CO生成.基于Au纳米针的局域电场促进了CO_(2)RR的CO生成.本文利用Cu纳米针促进并优化C-C偶联反应来提高C_(2)产物活性和选择性.结果表明,局部电场可以促进C-C偶联过程,进而增强CO_(2)电还原生成C_(2)产物.有限元模拟结果表明,高曲率铜纳米针处存在较强的局部电场;密度泛函理论计算结果表明,强电场能促进C-C耦合过程.在此基础上,制备了一系列不同曲率的Cu催化剂,其中,Cu纳米针(CuNNs)的曲率最高,Cu纳米棒(CuNRs)和Cu纳米颗粒(CuNPs)曲率次之.实验测得CuNNs上吸附的K+浓度最高,证明了纳米针上的局部电场最强.同时,CO吸附传感器测试表明,CuNNs对CO的吸附能力最强,原位傅里叶变换红外光谱显示,CuNNs的*COCO和*CO信号最强.由此可见,高曲率铜纳米针可以诱导高局部电场,从而促进C-C耦合过程.催化性能测试结果表明,在低电位(-0.6 V ***)下,Cu NNs对CO_(2)RR的生成C_(2)产物的法拉第效率值为44%,约为Cu NPs的2.2倍.综上,本文为CO_(2)RR过程中提高多碳产物提供了新的思路.

关键词：电场效应 C-C偶联铜纳米针 C_(2)产物二氧化碳还原

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

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