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Research of the Tribological Properties of the Surface on 16Mn Steel by Plasma Nitriding and S-N-C Plasmas Composite Treatment

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材料热处理学报 2004年第5期25卷 412-416页

作者： WUXiao-chun ChENRui SchoolofMaterialsscienceandengineering ShanghaiUniversityShanghaiChina

Sulfide layer with certain thickness was made on the nitrided surface of 16Mn steel by means of plasma S-C-N composite treatment. Under half lubricated condition, friction coefficient and wear loss of LY12.aluminum alloy were measured in sliding against samples of 16Mn treated by cubrizing and sulphiding respectively; In order to avoid the transfer of aluminum to the steel that lead to the inaccurate measurement of wear loss of carburized samples, Grl5 steel was adopted as counterpart face to measure the wear loss of them. SEM and EDAX were used for the morphological and chemical characterization of the wear surface and longitudinal cross-sections beneath sliding surface of LY12.aluminum alloy cirque and the wear tacks of the carburized samples and sulphided samples. Results show: The surface roughness, wear rate, average friction coefficient and magnitude of friction fluctuations of LY12.aluminum alloy cirque sliding against sulphided sample were all lower than sliding against carburized sample; Compared with carburized layer, sulfide layer of 16Mn steel can not only efficiently prevent the occurrence of adhesion when sliding against LY12.aluminum alloy, but also greatly lower the wear loss when sliding against Grl5 steel.

关键词：多倍硫化度等离子渗碳磨耗减量摩擦系数 16Mn钢

Identity based signature scheme based on cubic residues

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science china(Information sciences) 2011年第10期54卷 2001-2012页

作者： XING DongSheng,CAO ZhenFu & DONG XiaoLei Department of Computer science and engineering,{2. Jiao Tong university,{2. 2.02.0,china Department of Computer science and engineering Shanghai Jiao Tong University Shanghai China

We propose a novel method to compute a cubic root of a cubic residue in Eisenstein *** applying our method,a new identity based signature scheme is proposed based on cubic *** formally prove that our scheme is secure against existential forgery on the adaptive chosen message and identity attacks assuming the hardness of *** scheme is the first identity based signature scheme based on cubic residues.

关键词： Eisenstein ring identity based signature cubic residue factoring random oracle proven security

Hydrothermal route to Eu doped LuO(OH) and Lu_2._3 nanorods

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science china(Technological sciences) 2010年第6期53卷 1576-1582页

作者： QIU HuaJun1,SHI Ying1,XIE JianJun1,XIE Jie1,ZHANG LinLin2.& XU FangFang2.1 School of Materials science and engineering,{2. university,{2. 2.0072.china 2.6} Institute of Ceramics,Chinese Academy of sciences,{2. 2.0050,china School of Materials science and engineering Shanghai University Shanghai China shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai China

A facile method was developed to synthesize Eu doped LuO(OH) nanorods through hydrothermal processing and Lu2.3 nanorods by subsequent *** microstructural morphologies of the Lu-based nanostructures could be controlled by simply varying the concentration of NaOH in hydrothermal processing as *** observation revealed that the obtained LuO(OH) nanorods after hydrothermal processing had a uniform diameter of 10-2. nm and a length around 100 *** heat treatment at 600-700°C for 2.h,the high length/diameter ratio was sustained in the obtained Lu2.3 nanorods with different sizes depending on the calcining temperatures.

关键词： nanorods hydrothermal processing LuO(OH) Lu2.3

Experimental study on CCl_4/CH)4/O_2.N_2.oxidation

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science china(Technological sciences) 2010年第4期53卷 1016-1022页

作者： WANG Bo1,2.CHI Yong2.YAN JianHua2.& NI MingJiang2.1 College of Energy and Power engineering,university of{2. for science and Technology,shanghai 2.0093,china 2.State Key Laboratory of Clean Energy Utilization,Zhejiang university,Hangzhou 31002.,china College of Energy and Power engineering University of Shanghai for Science and Technology Shanghai China State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou China

Oxidation within the system CCl4/CH4/O2.N2.is studied at atmospheric pressure in a tubular flow reactor to investigate the influence of reaction temperature and chlorine content on chlorinated waste combustion and find incineration process optimization methods for pollution *** reaction temperature varies from 700℃ to 1000℃ and the CCl4/CH4(or Cl/H) mole ratio of the inlet mixture varies from 0.2. to *** profiles are measured with *** is shown that at the same initial CCl4 concentration and reaction temperature adding CH4 favors CCl4 destruction and CO2.*** the destruction and removal efficiency(DRE) of CH4 decreases with lower Cl/H and higher concentrations of toxic products of incomplete combustion such as COCl2.and CH3Cl are formed at the same *** chlorine in the system favors CH4 decomposition,but it also inhibits further oxidation of *** temperature assists in both CCl4 destruction and CH4 conversion,and the concentration of toxic combustion intermediates is *** the temperature is the most effective way to enhance CCl4 *** CO2.concentration increases with temperature.A CO concentration peak is observed around 800℃:with a certain Cl/H,the CO concentration first increases with temperature and then *** effect of increasing CH4 concentration on CCl4 destruction becomes mild above 900℃.Rather,it enhances the interaction between chlorine and carbonaceous radicals,which leads to higher concentration of toxic products.

关键词： hazardous waste destruction and removal efficiency(DRE) oxidation carbon tetrachloride chlorinated compounds methane

Chemical Extraction Preparation of Delithiated Cathode Materials of Li-ion Battery

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Journal of Wuhan university of Technology(Materials science) 2009年第6期24卷 863-866页

作者：闫时建 School of Materials science and engineering Taiyuan University of Science and Technology

A method of conventional chemical reaction to prepare delithiated cathode materials of Li-ion battery was introduced. The cathode material of Li-ion battery was mixed with oxidizing agent Na2.2.8 in water solution, and the solution was stirred continuously to make the chemical reaction proceed sufficiently, then the reaction product was filtered and finally the insoluble delithiated cathode material was obtained. A series of tests were conducted to verify the composition, crystal structure and electrochemical property of the delithiated cathode materials were all desirable. This method overcomes the shortcomings of battery charging preparation and chemical extraction preparation employing other oxidizing agents.

关键词： chemical extraction delithiated cathode material Li-ion battery

EXPERIMENTAL INVESTIGATION ON THE DRAG REDUCTION CHARACTERISTICS OF TRAVELING WAVY WALL AT HIGH REYNOLDS NUMBER IN WIND TUNNEL

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Journal of Hydrodynamics 2010年第5期22卷 719-724页

作者： YAO Yan LU Chuan-jing SI Ting ZHU Kun Department of engineering Mechanics Shanghai Jiao Tong University Shanghai 200240 China Beijing Electromechanic engineering Institute Beijing 100074 China State Key Laboratory of Ocean engineering Shanghai Jiao Tong University Shanghai 200030 China Department of Modern Mechanics University of Science and Technology of China Hefei 230027 China

Drag reduction experiments of the traveling wavy wall at high Reynolds number, ranging from 1.46×106 to 5.83×106 based on the free-stream velocity and the model length, were conducted. A suit of traveling wavy wall device was developed and its characteristics of drag reduction at high Reynolds number were investigated. The drag forces of the traveling wavy wall with various wave speeds （ c ） were measured at different wind speeds （U ） in the FL-8 low-speed wind tunnel and compared with the drag force of the flat plate. The results show that the mean drag force of the traveling wavy wall decreases as the value of c /U increases, at different wind velocities, the values of c /U corresponding to minimal drag force of the traveling wavy wall are different, when the values of c /U are larger than 0.6, the mean drag forces of the traveling wavy wall are smaller than those of the flat plate, and the drag reduction can be up to 60%. The drag reduction effectiveness of traveling wavy wall is thus achieved. Furthermore, as the value of c /U increases, the traveling wavy wall can restrain the separation and improve the quality of flow field.

关键词： flow control drag reduction traveling wavy wall wind tunnel test

Homotopic mapping solving method for gain fluency of a laser pulse amplifier

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science china(Physics,Mechanics & Astronomy) 2009年第7期52卷 1007-1010页

作者： MO JiaQi1,2.1 Anhui Normal university, Wuhu 2.1000, china 2.Division of Computational {2., E-Institutes of shanghai Universities, at SJTU, shanghai 2.02.0, china Anhui Normal university Wuhu China Division of Computational science E-Institutes of Shanghai Universities at SJTU Shanghai China

The model for gain fluency of a laser pulse amplifier is studied. Using the homotopic mapping method, firstly, the system of the original model is packed up standardization; secondly, introducing a homotopic mapping, taking the property of the mapping, inducing a contrived parameter, the solving of a nonlinear problem translates into the solving of a linear problem. Then the approximate expressions of the solution for the corresponding model are obtained. And the precision for the approximate solution is compared. It illuminates that the obtained approximate solution using the homotopic mapping method possesses higher approximate degree. At one time, the expansion of solution through the homotopic mapping method can be kept in the analytic operation. Thus it also enables us through differential and integral operations to obtain other physics behavior for the gain fluency of laser pulse amplifier.

关键词： nonlinear homotopic mapping laser pulse amplifier

Model test of the tunnel subjected to high water pressure in Jinping Second Cascade Hydropower Station,china

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science china(Technological sciences) 2011年第S1期54卷 192-198页

作者： WANG JianXiu 1,2.FENG Bo 2.HU LiSheng 2.TIAN PuZhuo 2.SUI DongChang 2.TANG YiQun 1,2.&YANG Ping 1,2.1 Key Laboratory of Geotechnical and Underground engineering of Ministry of Education,Tongji university,{2. 2.0092.china 2.Department of Geotechnical engineering,Tongji university,{2. 2.0092.china Key Laboratory of Geotechnical and Underground engineering of Ministry of Education Tongji University Shanghai China Department of Geotechnical engineering Tongji University Shanghai China

In the area with high groundwater pressure,grout curtain is often adopted to reduce the water pressure on tunnel lining.A series of model tests for the diversion tunnel of the Jinping Second Cascade Hydropower Station,china,is designed to study the effect of grout *** impact of the thickness of grout curtain,permeability of grout curtain,internal water pressure and drainage inflow on the distribution of water pressure are *** results indicates that under un-drained condition,water pressure is equal to hydrostatic one no matter grout curtain is selected or not,water pressure under drained condition is far less than that of un-drained condition,drainage in tunnel can reduce tunnel water pressure *** same inflow,both increasing of thickness and decrease of hydraulic conductivity of grout curtain can reduce water pressure *** the same water pressure,the smaller inflow of grout curtain,the less volume of water to be *** impact of hydraulic conductivity of grout curtain is more obvious than that of *** increasing of internal water pressure,the water pressure of grout curtain increases too,and the water pressure increases nearly *** proposed thickness of grout curtain for the diversion tunnels is 16 m.

关键词： tunnel grout curtain water pressure model test

Study on the bulk wave radiation of finite-length SAW devices using FEM/BEM

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Progress in Natural science:Materials International 2005年第5期15卷 402-406页

作者： WANG Weibiao1*, ZHANG Xiaodong1, SHUI Yongan1, ZHANG De1 and HAN Tao2.1. State Key Laboratory of Modern Acoustics, Institute of Acoustics, Nanjing university, Nanjing 2.0093, china 2.{2. Jiaotong university,{2. 2.0030, china) State Key Lab. of Modern Acoustics Inst. of Acoustics Nanjing Univ. Nanjing 210093 China shanghai Jiaotong Univ. Shanghai 200030 China

Based on the distributions of stress and free charge on the interface of the surface acoustic wave (SAW) device calculated with the combination of boundary element method and finite element method(FEM/BEM), the power of each of the three possible bulk waves radiated by the SAW device is calculated, and their contributions to the overall input conductance are separated respectively. Moreover, the formula of angular distributions of their power radiation into the substrate is derived. Consider the effect of mass loading, the resistance density,defined as a scalar, is extended to generalized resistance densities which can be written as three 4×4 tensors and for which the formulas are derived. The bulk wave radiations for a synchronous one-port resonator on 42.Y-rotated LiTaO 3 are simulated. It is found that the radiated energy by slow shear wave contributes a very high proportion to input electrical energy in some frequency range.

关键词： SAW device bulk wave radiation FEM/BEM.