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Straight-Leaned Blade Aerodynamics of A Turbine Nozzle Blade Row with Low Span-Diameter Ratio

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Journal of Thermal Science 2000年第1期9卷 51-52页

作者： N. x. chen Y. J. x. W.G Huang Institute of Engineering Thermophysics Chinese Academy of Sciences P.O. Box 2706 Beijing 100080

Compound-leaned blades have been applied for the design of turbomachinery for reducing secondary flow losses and then improving the aerodynamic performance. The aerodynamics features are not clear enough so far and, therefore, have been investigted by many authors ex.erimentally and numerically. The present study on turbomachinery aerodynamics is emphasized on the leaning effects of straight-leaned turbine nozzle blades With low span-diameter ratio (less than 0.1). This Kind of blades has relatively low efficiency. This is due to that the blades are too short and then the loss contours of both tip and hub surfaces are merged with each other. How to increase the efficiency efficiency becomes of the important subjects, which is faced to the turbomachinery community. Effects of straight-leaned blades in a turbine nozzle blade row with low span-diameter ratio have been assessed using three-dimensional steady Reynolds-averaged Navier-Stokes computations.

关键词：透平机导向器叶片空气动力学

“One stone, two birds”: Salt template enabling porosity engineering and single metal atom coordinating toward high-performance zinc-ion capacitors

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Journal of Energy Chemistry 2025年第1期100卷 637-645页

作者： Chunliu Zhu Huanyu Liang Ping Li chenglong Qiu Jingyi Wu Jingwei chen Weiqian Tian Yue Zhu Zhi Li Huanlei Wang School of Materials Science and Engineering Ocean University of China Department of Chemical.and Materials Engineering University of Alberta

Zinc-ion hybrid capacitors （ZIHCs） have received increasing attention as energy storage devices owing to their low cost,high safety,and environmental ***,their progress has been hampered by low energy and power density,as well as unsatisfactory long-cycle stability,mainly due to the lack of suitable electrode *** this contex.,we have developed manganese single atoms implanted in nitrogen-doped porous carbon nanosheets （MnSAs/NCNs） using a metal salt template method as cathodes for *** metal salt serves a dual purpose in the synthesis process:It facilitates the uniform dispersion of Mn atoms within the carbon matrix.and acts as an activating agent to create the porous *** applied in ZIHCs,the MnSAs/NCNs electrode demonstrates ex.eptional performance,including a high capacity of 203 m Ah g-1,an energy density of 138 Wh kg-1at 68 W kg-1,and ex.ellent cycle stability with 91%retention over 10,000 *** calculations indicate that the introduced Mn atoms modulate the local charge distribution of carbon materials,thereby improving the electrochemical *** work demonstrates the significant potential of carbon materials with metal atoms in zinc-ion hybrid capacitors,not only in enhancing electrochemical performance but also in providing new insights and methods for developing high-performance energy storage devices.

关键词： Zinc ion hybrid capacitors Cathodes Carbon materials Heteroatoms Single atoms

STUDY ON THE STABILITY OF T'PHASE IN THE al-Zn-Cu TERNARY SYSTEM

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Acta Metallurgica Sinica(English Letters) 2004年第3期17卷 269-273页

作者： H.chen x. x.n D. Y.Dong Y.P. Ren S.M.Hao Department of Material Science and Technology School of Materials and Metallurgy Northeastern University Shenyang 110004 China

The phase constitutes and phase compositions in the eight alloys designed with dif-ferent compositions of al--Zn--Cu system have been determined after the homogenous treatment and then equilibrium cooling to 20℃by use of optical microscope,electron probe microanalysis and x.-ray *** has been found that there ex.sted the T'phase in the seven ***,it was testified that the T'phase was stable at room *** the same time,the phase relationship was not locally right for the isothermal section of 20℃of al--Zn--Cu system of the ASM published in 1997.

关键词： al-Zn-Cu ternary system phase diagram T’phase equilibrium treatment

Plasmonic tandem heterojunctions enable high-efficiency charge transfer for broad spectrum photocatalytic hydrogen production

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Journal of Energy Chemistry 2025年第1期100卷 710-720页

作者： Wenx.an chen x.u-Qing Qiao Guo Hui Bojing Sun Dongfang Hou Meidi Wang x.eqian Wu Tao Wu Dong-Sheng Li College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials China Three Gorges University Hubei Three Gorges Laboratory College of Chemistry and Materials Science and Guangdong Provincial Key Laboratory of Supramolecular Coordination Chemistry Jinan University

Rational engineering of semiconductor photocatalysts for efficient hydrogen production is of great significance but still challenging,primarily due to the limitations in charge transfer ***,a fascinating plasmonic tandem heterojunction with the hc-CdS/Mo2C@C heterostructure is aimfully prepared for effectively promoting the charge separation kinetics of the CdS photocatalyst via the synergistic strategy of phase junction,Schottky junction,and photothermal *** difference in atomic configuration between cubic-CdS （c-CdS） and hex.gonal-CdS （h-CdS） leads to effective charge separation through a typical Ⅱ charge transfer mechanism,and plasmonic Schottky junction further ex.racts the electrons in the hc-CdS phase junction to realize gradient charge ***,the photothermal effect of Mo2C@C helps to ex.and the light absorption,accelerate charge transfer kinetics,and reduce the hydrogen evolution energy *** carbon layer provides a fast channel for charge transfer and protects the photocatalyst from *** a result,the optimized hc-CMC photocatalyst ex.ibits a significantly high photocatalytic H2production activity of 28.63 mmol/g/h and apparent quantum efficiency of 61.8%,surpassing most of the reported *** study provides a feasible strategy to enhance the charge transfer kinetics and photocatalytic activity of CdS by constructing plasmonic tandem heterogeneous junctions.

关键词： Cadmium sulfide

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草地场景真实感模拟技术综述

计算机辅助设计与图形学学报 2010年第9期22卷 1628-1638页

作者：邱航陈雷霆 Jim x. chen 凌飞电子科技大学计算机科学与工程学院成都611731 Department of Computer Science George Mason University Fairfax VA 22030-4444 USA

草体作为自然场景的一种重要组成元素,其数量众多、覆盖范围广,因此很难实现实时绘制,大规模草地场景真实感模拟已成为计算机图形学中研究的热点和难点之一.文中对20多年来草地场景真实感模拟技术的发展情况进行综述,分别从绘制技术、LO... 详细信息

草体作为自然场景的一种重要组成元素,其数量众多、覆盖范围广,因此很难实现实时绘制,大规模草地场景真实感模拟已成为计算机图形学中研究的热点和难点之一.文中对20多年来草地场景真实感模拟技术的发展情况进行综述,分别从绘制技术、LOD表达、动态模拟以及业界现状等几个方面做了比较深入的介绍,分析并比较了一些典型方法的基本原理和优缺点;最后对该领域未来的发展趋势进行了展望.

关键词：自然场景草体细节层次动画体纹理

Effect of a High Magnetic Field on the Shape of the γ' Precipitates in Cast Nickel-based Superalloy K52

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Journal of Materials Science & Technology 2009年第3期25卷 379-382页

作者： x. Ren G.Q. chen W.L. Zhou C.W. Wu C. Yuan J.S. Zhang State Key Laboratory of Materials Modification by Laser Ion and Electron Beams Dalian University of Technology Dalian 116085 China State Key Laboratory of Structural.analysis for Industrial Equipment Dalian University of Technology Dalian 116085 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The shape change of the γ＇ precipitates of cast Ni-based superalloy K52 after aging treatment under a high magnetic field was investigated. The results show that duplex.γ＇ precipitates are present in the γ matrix.after aging treatment with or without the magnetic field. One is the coarse particles with average size of 500 nm; the other is fine spherical γ＇ precipitates with average of 100 nm in diameter. The application of a 10T magnetic field only results in the shape of the coarse γ＇ particles changing from spherical to cuboidal when the alloys subjected to the same heat treatments. This shape change was mainly discussed based on the strain energy increase caused by the difference in magnetostriction between the γ matrix.and γ＇ precipitates. The fine γ＇ particles still keep spherical. Further TEM observations shows that a number of γ particles in nano-scale precipitate in the coarse γ＇ particles in the specimens treated without the magnetic field. In addition, it was found that the magnetic field caused the decrease of the hardness in the alloy, and the hardness was associated with the field direction.

关键词： Ni-based superalloy High magnetic field Magnetostrictive strain energy Precipitation

Effect of compressibility on the hypervelocity penetration

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Acta Mechanica Sinica 2018年第1期34卷 82-98页

作者： W.J.Song x.W.chen P.chen Department of Mechanics and Engineering Science College of Engineering Peking University Advanced Research Institute for Multidisciplinary Science Beijing Institute of Technology The State Key Lab of Ex.losion Science and Technology Beijing Institute of Technology Centre for Applied Physics and Technology (CAPT) Peking University

We further consider the effect of rod strength by employing the compressible penetration model to study the effect of compressibility on hypervelocity ***, we define different instances of penetration efficiency in various modified models and compare these penetration efficiencies to identify the effects of different factors in the compressible model. To systematically discuss the effect of compressibility in different metallic rod-target combinations, we construct three cases, i.e., the penetrations by the more compressible rod into the less compressible target, rod into the analogously compressible target, and the less compressible rod into the more compressible target. The effects of volumetric strain, internal energy, and strength on the penetration efficiency are analyzed simultaneously. It indicates that the compressibility of the rod and target increases the pressure at the rod/target interface. The more compressible rod/target has larger volumetric strain and higher internal energy. Both the larger volumetric strain and higher strength enhance the penetration or anti-penetration ability. On the other hand, the higher internal energy weakens the penetration or anti-penetration ability. The two trends conflict, but the volumetric strain dominates in the variation of the penetration efficiency, which would not approach the hydrodynamic limit if the rod and target are not analogously compressible. However, if the compressibility of the rod and target is analogous, it has little effect on the penetration efficiency.

关键词： Compressibility Hypervelocity penetration Equation of state(EOS) Shockwave Bernoulli equation

Cyanobacterial bloom dynamics in Lake Taihu

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Journal of Environmental Sciences 2015年第6期27卷 249-251页

作者： Katherine Z. Fu Birget Moe x.ng-Fang Li x. Chris Le Division of Analytical.and Environmental Tox.cology Department of Laboratory Medicine and Pathology University of Alberta

Lake Taihu is the third largest freshwater lake in China and serves as an important drinking water source for the local populace;however,decades of ex.essive nutrient loading fueled by anthropogenic activities have resulted in hypertrophic conditions,promoting the annual formation of nuisance phytoplankton blooms（chen et al.,2003;Duan et al.,2009）

关键词： Cyanobacteria Blue-green algae Microcystin Natural tox.ns Water quality Nutrients Nitrogen and phosphorus Carbon diox.de

Electronic structure and ultraviolet spectra of p-C_(6)H_(4)-C_(20)

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原子与分子物理学报 2025年第3期42卷 21-28页

作者： chen x.n School of Materials and Chemical Engineering West Anhui UniversityLu’an 237012China

Geometry optimization of p-C_(6)H_(4)-connected cyclo[20]carbon(p-C_(6)H_(4)-C_(20))was carried out at M062x.6-311G(d,p)level,three kinds of bond orders(Mayer,Laplacian,and Wiberg),electron-hole distributions,localized orbital locators(LOL),and infrared(IR)spectrum were also performed at the same *** on TD-DFT M062x.6-311G(d,p)method,the first 20 ex.ited states and ultraviolet(UV)spectra of p-C_(6)H_(4)-C_(20) were *** results of π-electron delocalization analyses prove thatπ-electron delocalization of p-C_(6)H_(4)-C_(20) is more likely to occur on shorter C-C bonds rather than longer C-C bonds,and inside/outside of the ring plane rather than above/below the ring *** absorption peaks of p-C_(6)H_(4)-C_(20) locate at about 319 nm and 236 nm,respectively.

关键词： p-C_(6)H_(4)-C_(20) Bone orders UV spectrum Electron-hole analyses π-electron delocalization analyses