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Surface manipulation of a triple-conducting cathode for protonic ceramic fuel cells to enhance oxygen reduction activity and CO_(2) tolerance

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Journal of Energy Chemistry 2023年第12期87卷 450-459,I0012页

作者： Wenwen Zhang Hiroki muroyama Yuichi mikami toshiaki matsui Koichi Eguchi Department of Energy and Hydrocarbon Chemistry Graduate School of EngineeringKyoto UniversityNishikyo-kuKyoto 615-8510Japan Technology Division Panasonic Holdings Corporation3-1-1 Yagumo-naka-machiMoriguchi CityOsaka 570-8501Japan

One of the main obstacles limiting the performance of protonic ceramic fuel cells(PCFCs) is the sluggish kinetics of the oxygen reduction reaction(ORR) at reduced ***,the surface manipulation of a triple-conducting cathode BaCe_(0.5)Pr_(0.3)Y_(0.2)O_(3-δ)(BCPY) by an efficient catalyst coating PrNi_(0.5)Co_(0.5)O_(3-δ)(PNC) to enhance the ORR activity and CO_(2) tolerance is *** developed PNC-coated BCPY cathode achieves the polarization resistance of 0.25 and 1.00 Ω cm^(2) at 600 and 500 ℃,respectively,approximately 1/5 of that for the pristine BCPY cathode(0.99 and 4.79 Ω cm^(2)),while maintaining an excellent CO_(2) *** single cell on a BaZr_(0.8)Yb_(0.2)O_(3-δ) electrolyte also exhibits a high peak power density of 0.79 W cm^(-2)at 700 ℃ and a stable operation for 200 h at 600 ℃.Such high ORR activity is mainly attributed to the synergistic effect of BCPY support and PNC ***,BCPY provides a tripleconducting path(mainly protons),and PNC nanoparticles facilitates surface oxygen exchange and steam adsorption/desorption processes due to the enriched surface oxygen *** study will provide a new design strategy for developing high-performance PCFCs cathode.

关键词： Triple-conducting cathode Surface manipulation Oxygen reduction reaction CO_(2)tolerance Protonic ceramicfuel cells

Glia-to-neuron reprogramming to the rescue?

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Neural Regeneration Research 2025年第5期20卷 1395-1396页

作者： Jack W.Hickmott Cindi m.morshead Department of Surgery University of TorontoTorontoONCanada Donnelly Centre for Cellular and Biomolecular Research TorontoONCanada Institute of Biomedical Engineering University of TorontoTorontoONCanada The KITE Research Institute Toronto Rehabilitation InstituteUniversity Health NetworkTorontoONCanada

Over the last two decades,the dogma that cell fate is immutable has been increasingly challenged,with important implications for regenerative *** brea kth rough discovery that induced pluripotent stem cells could be generated from adult mouse fibroblasts is powerful proof that cell fate can be *** exciting extension of the discovery of cell fate impermanence is the direct cellular reprogram ming hypothesis-that terminally differentiated cells can be reprogrammed into other adult cell fates without first passing through a stem cell state.

关键词： programming passing proof

用原子力显微镜纳米压痕法研究Gr/Al复合材料热循环后的微观力学性能(英文)

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稀有金属材料与工程 2001年第4期30卷 261-263页

作者：刘澄张国定 naka masaaki 上海交通大学金属基复合材料国家重点实验室上海200030 日本大阪大学接合科学研究所

采用原子力显微镜纳米压痕法测量了 Gr/ Al复合材料热循环后界面附近的纳米硬度和塑性变形能力的分布。随热循环次数的增加 ,纤维和基体中的纳米硬度减小 ,而基体的塑性变形能力增加。纳米硬度和塑性变形能力的大小是随距纤维 /基体界... 详细信息

采用原子力显微镜纳米压痕法测量了 Gr/ Al复合材料热循环后界面附近的纳米硬度和塑性变形能力的分布。随热循环次数的增加 ,纤维和基体中的纳米硬度减小 ,而基体的塑性变形能力增加。纳米硬度和塑性变形能力的大小是随距纤维 /基体界面的距离的变化而变化的。纳米硬度的变化可提供有关残余应变方面的信息 ,这是因为材料内部局部区域的弹性或塑性残余应变会影响此处的硬度大小。

关键词：纳米硬度塑性变形能力残余应力界面金属基复合材料

Study of Spiral Flow Generated through an Annular Slit

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Journal of Thermal Science 2005年第2期14卷 97-102页

作者： Tae Hun KIm Shigeru mATSUO toshiaki SETOGUCHI Heuy-Dong KIm Graduate school of Science and Technology Saga University 1Honjo-machiSaga shiSaga 840-8502JapanDepartment of Mechanical Engineering Saga University1Honjo-machiSaga shiSaga 840-8502JapanDepartment of Mechanical Engineering Saga University1Honjo-machiSaga shiSaga 840-8502JapanSchool of Mechanical Engineering College of Natural ScienceAndong National University388Song Cheon DongAndongKyung PookKorea

The effect of pressurized air inlets in the reservoir upstream of the annular slit on characteristics of the axial and tangential velocity components is investigated numerically, and the mechanism of occurrence of spiral nozzle flow is clarified. In simulations, Unified Platform for Aerospace Computational Simulation (UPACS) is used. The governing equations under consideration are the unsteady compressible Navier - Stokes. A second-order finite volume scheme with mUSCL (Roe scheme) is used to discretize the spatial derivatives, and a second order-central difference scheme for the viscous terms, and a mFGS (matrix Free Gauss Seidel) is employed for time integration. Spalart-Allmaras model was used as a turbulence model. The results obtained are compared with velocity distributions in the experiment measured by the two-component fiber optic laser Doppler velocimeter system. The existence of discrete pressurized air inlets that leads to the occurrence of asymmetrical characteristics is a very important factor for the formation of spiral flow.

关键词： spiral nozzle flow Coanda effect convergent nozzle annular slit simulation.

Unsteady Operation of New Type Turbofan Engine with Aerodynamic Torque Converter Reducing Front Fan Speed

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Journal of Thermal Science 2005年第3期14卷 206-210页

作者： toshiaki KANEmOTO Seita SEKI Kazunori IDENO Ahmed mohamed GALAL Kyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 Japan ProfessorKyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 JapanKyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 JapanKyushu Institute of Technology Sensui 1-1 Tobata Kitakyushu 804-8550 Japan

It is desired to increase the rotational speed of the core engine of the turbofan so as to get the best efficiency for the next leap of engine technology. The conventional mechanism in which the front fan is directly connected to the output shaft of a core engine, have a limit of increasing the spool speed, because the fan diameter is very large. The authors have proposed a new driving system in which the front fan is driven through the aerodynamic torque converter. The front fan can work at the best performance at slower speed while the core engine runs more efficiently at higher speed. Continuously, this paper discusses the response of the front fan in the unsteady operation of the core engine, accompanying with the internal flow. The system has the acceptable responsibility in the unsteady operation which is very important for the aircrafts.

关键词： turbofan engine front fan torque converter rotational speed

Petrology,geochemistry,and zircon U-Pb geochronology of the Zambezi Belt in Zimbabwe:Implications for terrane assembly in southern Africa

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Geoscience Frontiers 2019年第6期10卷 2021-2044页

作者： Yusuke Kuribara toshiaki Tsunogae Yusuke Takamura Yukiyasu Tsutsumi Graduate School of Life and Environmental Sciences University of TsukubaIbaraki 305-8572Japan Department of Geology University of JohannesburgAuckland Park 2006South Africa Department of Geology and Paleontology National Museum of Nature and ScienceIbaraki 305-0005Japan

The Zambezi Belt in southern Africa has been regarded as a part of the 570-530 ma Kuunga Orogen formed by a series of collision of Archean cratons and Proterozoic orogenic ***,we report new petrological,geochemical,and zircon U-Pb geochronological data of various metamorphic rocks(felsic to mafic orthogneiss,pelitic schist,and felsic paragneiss)from the Zambezi Belt in northeastern Zimbabwe,and evaluate the timing and P-T conditions of the collisional event as well as protolith *** data of felsic orthogneiss indicate within-plate granite signature,whereas those of mafic orthogneiss suggest mORB,ocean-island,or within-plate *** P-Testimates for orthogneisses indicate significant P-T variation within the study area(700-780 C/6.7-7.2 kbar to 800-875 C/10-11 kbar)suggesting that the Zambezi Belt might correspond to a suture zone with several discrete crustal *** cores from felsic orthogneisses yielded two magmatic ages:2655±21 ma and 813士5 ma,which suggests Neoarchean and Early Neoproterozoic crustal growth related to within-plate *** zircons from metasediments display various ages from Neoarchean to Neoproterozoic(ca.2700-750 ma).The Neoarchean(ca.2700-2630 ma)and Paleoproterozoic(ca.2200-1700 ma)zircons could have been derived from the adjacent Kalahari Craton and the magondi Belt in Zimbabwe,*** Choma-Kalomo Block and the Lufilian Belt in Zambia might be proximal sources of the meso-to Neoproterozoic(ca.1500-950 ma)and early Neoproterozoic(ca.900-750 ma)detrital zircons,*** detrital zircons from adjacent terranes possibly deposited during late Neoproterozoic(744-670 ma),and subsequently underwent highgrade metamorphism at 557-555 ma possibly related to the collision of the Congo and Kalahari Cratons during the latest Neoproterozoic to *** contrast,670-627 ma metamorphic ages obtained from metasediments are slightly older than previous reports,but consistent with^68

关键词： Geothermobarometry Detrital zircon Neoproterozoic Congo Craton Kalahari Craton Gondwana

Phase equilibrium modeling of incipient charnockite formation in NCKFmASHTO and mnNCKFmASHTO systems:A case study from Rajapalaiyam,madurai Block,southern India

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Geoscience Frontiers 2012年第6期3卷 801-811页

作者： Takahiro Endo toshiaki Tsunogae m.Santosh E.Shaji Graduate School of Life and Environmental Sciences University of Tsukuba Department of Geology University of Johannesburg Division of Interdisciplinary Science Faculty of ScienceKochi University China University of Geosciences(Beijing) Department of Geology University of KeralaKariyavattom

Incipient charnockites represent granulite formation on a mesoscopic scale and have received considerable attention in understanding fluid processes in the deep crust. Here we report new petrological data from an incipient charuockite locality at Rajapalaiyam in the madurai Block, southern India, and discuss the petrogenesis based on mineral phase equilibrium modeling and pseudosection analysis. Rajapalaiyam is a key locality in southern India from where diagnostic mineral assemblages for ultrahigh-temperature （UHT） metamorphism have been reported. Proximal to the UHT rocks are patches and lenses of charnockite （Kfs＋Qtz ＋Pl＋ Bt ＋ Opx＋ Grt ＋Ilm） occurring within Opx-free Grt-Bt gneiss （Kfs ＋Pl ＋ Qtz ＋ Bt ＋ Grt ＋ Ilm ＋ mt） which we report in this study. The application of mineral equilibrium modeling on the charnockitic assemblage in NCKFmASHTO system yields a p-T range of 820 ℃ and -9 kbar. modeling of the charnockite assemblage in the mnNCKFmASHTO system indicates a slight shift of the equilibrium condition toward lower p and T （- 760 ℃ and - 7.5 kbar）, which is consistent with the results obtained fiom geothermobarometry （710--760 ℃, 6.7-7.5 kbar）, but significantly lower than the peak temperatures （〉1000 ℃） recorded from the UHT rocks in this locality, suggesting that charnockitization is a post-peak event. The modeling of 7 versus molar H2O content in the rock （m（H2O）） demonstrates that the Opx-bearing assemblage in charnockite and Opx- free assemblage in Grt-Bt gneiss are both stable at m（H2O） = 0.3 mol%--0.6 mol%, and there is no significant difference in water activity between the two domains. Our finding is in contrast to the previous petrogenetic model of incipient charnockite formation which envisages lowering of water activity and stabilization of orthopyroxene through breakdown of biotite by dehydration caused by the infiltration of CO2-rich fluid. T-XFe3＋（= Fe2O3/（FeO ＋ Fe2O3） in mole） pseudosections suggest that the oxidation condition of the rocks pl

关键词： Incipient charnockite Granulite Pseudosection Reduced fluid Petrology Southern India

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滚动轴承和滚珠丝扛中润滑油脂的外溅性

传动技术 1999年第3期13卷 43-44,25页

作者： NSKLtd. m.naka H.Itoh J.Kuraishi K.Namimatsu

滚动轴承或直线运动轴承中的润滑油脂，可能飞溅出颗粒，粘附在液晶制品或硬盘上，导致设备失效。所以，这种设备轴承所使用的润滑油脂尽可能降低飞溅性。但低飞溅性的润滑油脂可能带来耐磨性、噪声、阻力矩等问题。因此，我们需要一种... 详细信息

滚动轴承或直线运动轴承中的润滑油脂，可能飞溅出颗粒，粘附在液晶制品或硬盘上，导致设备失效。所以，这种设备轴承所使用的润滑油脂尽可能降低飞溅性。但低飞溅性的润滑油脂可能带来耐磨性、噪声、阻力矩等问题。因此，我们需要一种油脂，它既具有低飞溅性，又有较高的性能和使用寿命。为了开发低飞溅性的油脂，作者研究了油脂成分和飞溅性的关系。一些数据下面会提到。飞溅颗粒的多少和基油成分有很大关系，例如，润滑油脂基油是矿物油或合成碳化氢油，它们极性低，飞溅颗粒少；相反，如果是酯油，它的极性高，飞溅性也高。飞溅颗粒的多少也取决于增稠剂的类型和含量，例如浓的润滑油脂的飞溅数量少。作者证实了飞溅出来的颗粒不仅有基油颗粒，而且有细小的油脂颗粒，油脂颗粒的直径范围在０．１１到０．２μｍ。

关键词：滚动轴承滚珠丝找润滑油脂外溅性

Exercise-mediated adaptations in vascular function and structure:Beneficial effects in coronary artery disease

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World Journal of Cardiology 2021年第9期13卷 399-415页

作者： Xenofon m Sakellariou michail I Papafaklis Eleni m Domouzoglou Christos S Katsouras Lampros K michalis Katerina K naka michailideion Cardiac Centre University of IoanninaIoannina 45100EpirusGreece 2nd Department of Cardiology University Hospital of IoanninaIoannina 45100EpirusGreece Department of Pediatrics University Hospital of IoanninaIoannina 45100EpirusGreece

Exercise exerts direct effects on the vasculature via the impact of hemodynamic forces on the endothelium,thereby leading to functional and structural adaptations that lower cardiovascular *** patterns of blood flow and endothelial shear stress during exercise lead to atheroprotective hemodynamic stimuli on the endothelium and contribute to adaptations in vascular function and *** structural adaptations observed in arterial lumen dimensions after prolonged exercise supplant the need for acute functional vasodilatation in case of an increase in endothelial shear stress due to repeated exercise *** contrast,wall thickness is affected by rather systemic factors,such as transmural pressure modulated during exercise by generalized changes in blood *** mechanisms have been proposed to explain the exercise-induced benefits in patients with coronary artery disease(CAD).They include decreased progression of coronary plaques in CAD,recruitment of collaterals,enhanced blood rheological properties,improvement of vascular smooth muscle cell and endothelial function,and coronary blood *** review describes how exercise via alterations in hemodynamic factors influences vascular function and structure which contributes to cardiovascular risk reduction,and highlights which mechanisms are involved in the positive effects of exercise on CAD.

关键词： Exercise Endothelium Flow-mediated dilation Endothelial shear stress Coronary artery disease Hemodynamics