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Rare Metals 2024年第6期43卷 2536-2545页

作者： Lin-Tao Dou Bei Li Hao-Long Nie Dong-Dong xiao Chao-Qun Shang xiao-min wang Zhan-Hui Zhang Katerina E.Aifantis Pu Hu School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan 430205China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101400China Department of Mechanical and Aerospace Engineering University of FloridaGainesvilleFL 32603USA

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)is the most promising cathode for high-energy Li-ion batteries,despite its poor cycling stability that originates from the reactions that occur with the ***,to solve this interfacial issue,a facile electrolytic electrochemical polymerization process was introduced in this paper,and a uniform conductive electrolyte interface(polyaniline)was successfully constructed on the surface of the NCM811 porous electrode(PANI-NCM),which facilitated the charge transfer during charge/*** side reactions at the interface between the cathode and the electrolyte are suppressed,and thereby,the cycling performance and rate capability are considerably ***-NCM delivers an initial capacity of 157.2 mAh·g^(-1)as well as excellent cyclability(capacity retention of 88%after 500 cycles at 2C),whereas the capacity of the bare NCM811 has dropped to 31.3 mAh·g^(-1).In addition,polypyrrole and polythiophene also can be formed through electrolytic electrochemical polymerization process,which provides a practicable tactic to modify the interfacial stability of cathodes for high-energy Li-ion batteries.

关键词： Lithium-ion battery Ni-rich cathode In-situ polymerization Conductive polymer Electrochemical performance

A wavelet approach for active-passive vibration control of laminated plates

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Acta Mechanica Sinica 2012年第2期28卷 520-531页

作者： Ji-Zeng wang xiao-min wang You-He Zhou Key Laboratory of Mechanics on Disaster and Environment in Western China the Ministry of Education of Chinaand Department of Mechanics and Engineering SciencesSchool of Civil Engineering and MechanicsLanzhou University730000 LanzhouChina

As an extension of the wavelet approach to vi- bration control of piezoelectric beam-type plates developed earlier by the authors, this paper proposes a hybrid active- passive control strategy for suppressing vibrations of lami- nated rectangular plates bonded with distributed piezoelec- tric sensors and actuators via thin viscoelastic bonding lay- ers. Owing to the low-pass filtering property of scaling func- tion transform in orthogonal wavelet theory, this wavelet- based control method has the ability to automatically filter out noise-like signal in the feedback control loop, hence re- ducing the risk of residual coupling effects which are usu- ally the source of spillover instability. Moreover, the exis- tence of thin viscoelastic bonding layers can further improve robustness and reliability of the system through dissipating the energy of any other possible noise induced partially by numerical errors during the control process. A simulation procedure based on an advanced wavelet-Galerkin technique is suggested to realize the hybrid active-passive control pro- cess. Numerical results demonstrate the efficiency of the pro- posed approach.

关键词： Wavelets Piezoelectric structures Hybridactive-passive control Rectangular plate Viscoelastic ma-terial ~ Numerical simulation

Recent Progress in Carbon-based Materials of Non-Noble Metal Catalysts for ORR in Acidic Environment

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Acta Metallurgica Sinica(English Letters) 2021年第7期34卷 885-899页

作者： Jie Lian Jin-Yu Zhao xiao-min wang College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of New Energy Materials and Devices Taiyuan University of TechnologyTaiyuan 030024China

Proton exchange membrane fuel cell(PEMFC)has important implications for the success of clean transportation in the *** of the key factors affecting the cost and performance of PEMFC is the cathode electrocatalyst for the oxygen reduction reaction(ORR)to overcome sluggish kinetics and instability in an acidic *** an essential component of the electrocatalyst,the support material largely determines the activity,mass transfer,charge transfer,and durability of the ***,the support material plays a critical role in the overall performance of the *** materials are widely used as electrocatalyst supports because of their high porosity,conductivity,chemical stability,and tunable ***,some new carbon-based materials with excellent structure have been introduced,such as carbon nanotubes,carbon nanowires,graphene,metal-organic framework(MOF)-derived carbon,and biomass-derived carbon *** with a variety of strategies,such as controllable construction of porous structures and surface defects,proper doping heteroatoms,the ingenious design of model electrocatalysts,and predictive theoretical calculation,a new reliable path was provided for further improving the performance of electrocatalysts and exploring the catalytic *** on the topic of carbon-based materials for ORR in acidic medium,this review summarizes the up-to-date progress and breakthroughs,highlights the factors affecting the catalytic activity and stability of ORR electrocatalysts in acids,and discusses their future application and development.

关键词： Carbon-based materials Non-noble metal electrocatalysts Acidic environment Oxygen reduction reaction Proton exchange membrane fuel cell

Difference in gene expression of macrophage between normal spleen and portal hypertensive spleen idendified by cDNA microarray

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World Journal of Gastroenterology 2007年第24期13卷 3369-3373页

作者： Feng Yan xiao-min wang Postdoctoral Station Department of Hepato-Biliary Surgery Zhongshan Hospital Xiamen University Xiamen 361004 Fujian Province China Department of Hepato-Biliary Surgery Zhongshan Hospital Xiamen University Xiamen 361004 Fujian Province China

AIM: To identify the difference in gene expression of microphage (Mφ) between normal spleen and portal hypertensive spleen using cDNA microarrays and find new gene functions associated with hypersplenism in portal hypertension. METHODS: The Biostar-H140s chip containing 14 112 spots of cDNAs were used to investigate the difference of the expression. The total RNA extracted from macrophages isolated from both normal spleen and portal hypertensive spleen was reversely transcribed to cDNA with the incorporation of fluorescent (cy3 and cy5) labeled dCTP to prepare the hybridization probes. After hybridization, the gene chip was scanned for the fluorescent intensity. The differentially expressed genes were screened. That was repeated three times, and only the genes which had differential expression in all three chips were considered to be associated with hypersplenism in portal hypertension. RESULTS: Eight hundred and ninety-six, 1330 and 898 genes were identified to be differentially expressed in three chips, respectively. One hundred and twenty-one genes (0.86%) were identified to be differentially expressed in all three chips, including 21 up-regulated genes and 73 down-regulated genes. The differentially expressed genes were related to ionic channel and transport protein, cyclin, cytoskeleton, cell receptor, cell signal conduct, metabolism, immune, and so on. These genes might be related to the hypersplenism in portal ***: The investigations based on cDNA microarray can screen differentially expressed genes of macrophages between normal spleen and portal hypertensive spleen, thus may provide a new idea in studying the pathogenesis of hypersplenism in portal hypertension.

关键词： Hypersplenism Macrophage cDNA microarray

Geometric Phases Corrected by Stochastic Dephasing

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Communications in Theoretical Physics 2008年第5期49卷 1179-1181页

作者： MA xiao-San wang An-min Department of Modern Physics University of Science and Technology of China Hefei 230026 China

We analyze the effect of stochastic dephasing on geometric phases. The result implies that the correction of geometric phases relies on not only the fluctuation of the random variable in the stochastic process, but al... 详细信息

关键词： stochastic dephasing geometric phase

Breathers and solitons for the coupled nonlinear Schrodinger system in three-spine α-helical protein

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Chinese Physics B 2021年第10期30卷 231-238页

作者： xiao-min wang Peng-Fei Li Department of Physics Taiyuan Normal UniversityJinzhong 030619China Institute of Computational and Applied Physics Taiyuan Normal UniversityJinzhong 030619China

We mainly investigate the variable-coefficient 3-coupled nonlinear Schrodinger(NLS)system,which describes soli- ton dynamics in the three-spineα-helical protein with inhomogeneous *** variable-coefficient NLS equation is transformed into the constant coefficient NLS equation by similarity transformation *** Hirota method is used to solve the constant coefficient NLS equation,and then we get the one-and two-breather solutions of the variable-coefficient NLS *** results show that,in the background of plane waves and periodic waves,the breather can be transformed into some forms of combined soliton *** influence of different parameters on the soliton solution and the collision between two solitons are discussed by some graphs in *** results are helpful to study the soliton dynamics inα-helical protein.

关键词： breather soliton nonlinear Schrodinger system a-helical protein

Three-Di mensional Model for Strip Hot Rolling

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Journal of Iron and Steel Research International 2006年第1期13卷 23-26页

作者： ZHANG Guo-min xiao Hong wang Chun-hua Engineering College Yanshan University Qinhuangdao 066004 Hebei China

A three-dimensional model for strip hot rolling was developed, in which the plastic deformation of strip, the thermal crown of rolls, roll deflection and flattening were calculated by rigid-plastic finite element method, finite difference method, influential function method and elastic finite element method respectively. The roll wear was taken into consideration. The model can provide detailed information such as rolling pressure distribution, contact pressure distribution between backup rolls and work rolls, deflection and flattening of work rolls, lateral distribution of strip thickness, and lateral distribution of front and back tensions. The finish rolling on a 1 450 mm hot strip mill was simulated.

关键词： strip hot rolling model finite difference method influential function method finite element method

Down-regulation of extracellular signal-regulated kinase 1/2 activity in P-glycoprotein-mediated multidrug resistant hepatocellular carcinoma cells

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World Journal of Gastroenterology 2009年第12期15卷 1443-1451页

作者： Feng Yan xiao-min wang Chao Pan Quan-ming Ma Department of Hepatobiliary Surgery Postdoctoral Station Zhongshan Hospital Xiamen University Xiamen 361004 Fujian Province China Department of Hepatobiliary Surgery Digestive Diseases Institute Xiamen University Xiamen 361004 Fujian Province China Department of Pathology Zhongshan HospitalXiamen university Xiamen 361004 Fujian Province China Department of Hepatobiliary Surgery Zhongshan Hospital Xiamen University Xiamen 361004 Fujian Province China

AIM： To study the expression and phosphorylation of extracellular signal-regulated kinase （ERK） i and ERK2 in multidrug resistant （MDR） hepatocellular carcinoma （HCC） cells.METHODS： MDR HCC cell lines, HepG2/adriamycin （ADM） and SMMC7721/ADM, were developed by exposing parental cells to stepwise increasing concentrations of ADM. MTT assay was used to determine drug sensitivity. Flow cytometry was employed to analyze cell cycle distribution and measure cell P-glycoprotein （P-gp） and multidrug resistant protein 1 （MRP1） expression levels. ERK1 and ERK2 mRNA expression lev-ls were measured by quantitative real-time PCR （QRTPCR）. Expression and phosphorylation of ERK1 and ERK2 were analyzed by Western blot.RESULTS： MTT assay showed that HepG2/ADM andSMMC7721/ADM were resistant not only to ADM, but also to multiple anticancer drugs. The P-gp expression was over 10-fold higher in HepG2/ADM cells than in HepG2 cells （8.92% ±0.22% vs 0.88% ± 0.05%, P 〈 0.001） and over 4-fold higher in SMMC7721/ADM cells than in SMMC7721 cells （7.37% ± 0.26% vs 1.74% ± 0.25%, P 〈 0.001）. However, the MRP1 expression was not significantly higher in HepG2/ADM and SMMC7721/ADM cells than in parental cells. In addition, the percentage of MDR HepG2/ADM and SMMC7721/ADM cells was significantly decreased in the G0/G1 phase and increased in the the S phase or G2/M phase. QRT-PCR analysis demonstrated that the ERK1 and ERK2 mRNA expression increased apparently in HepG2/ADM cells and decreased significantly in SMMC7721/ADM cells. Compared with the expression of parental cells, ERK1 and ERK2 protein expressions were markedly decreased in SMMC7721/ADM cells. However, ERK2 protein expression was markedly increased while ERK1 protein expression had no significant change in HepG2/ADM cells. Phosphorylation of ERK1 and ERK2 was markedly decreased in both HepG2/ADM and SMMC7721/ADM MDR cells.CONCLUSION： ERK1 and ERK2 activities are downregulated in P-gp-mediated MDR HCC cells. ERK1 or ERK2 might be a p

关键词： Multidrug resistance Extracellular signalregulated MAP kinases Hepatocellular carcinoma P-glycoprotein Multidrug resistance-associated protein

TRAFFIC EMISSION TRANSPORTATION IN STREET CANYONS

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Journal of Hydrodynamics 2009年第1期21卷 108-117页

作者： XIE xiao-min wang Jia-song HUANG Zhen Key Laboratory for Power Machinery and Engineering of State Education ministry Shanghai Jiao Tong University Shanghai 200240 China

Spatial distributions of traffic-related pollutants in street canyons were investigated by field measurements and Computational Fluid Dynamics （CFD）. Two typical street canyons were selected for field monitoring, and a three-dimensional numerical model was built based on Reynolds-averaged Navier-Stokes equations equipped with the standard κ-ε turbulence models for CFD simulations. The study shows that the pollutant concentrations of vehicle emission correlate well with the traffic volume variation, wind direction and wind speed. The wind direction and speed at the roof level determine overwhellmingly the flow field and the distributions of pollutant concentrations in the street canyon. When the wind speed is equal to zero, the pollutant concentrations on the breath height of the both sides of the street canyon are almost the same. When the wind direction is perpendicular to the street, one main vortex is formed with a shape depending on the building structure on both sides of the street, the pollutant is accumulated on the leeward side, and the pollutant concentrations at the breath height on the leeward side are 2 to 3 times as those at the breath height on the windward side. If the wind direction makes some angles with the street canyon, the pollutant concentration will be higher on the leeward side because one main vortex will also be formed in the vertical section of the canyon by the perpendicular component of the wind. But pollutant concentrations decrease in the canyon because pollutants are dispersed along the axis of the street. Pollutants at different heights of the vertical section decrease with height, i.e. there are concentration gradients in the vertical section, and the pollutant concentrations on the leeward side of the upstream building are much higher than those on the windward side of the downstream building.

关键词： traffic emission street canyon field measurement CFD modeling

In vivo study of extracellular matrix coating enhancing fixation of the pedicle screw-bone＇s interface

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Chinese Medical Journal 2011年第23期124卷 3945-3952页

作者： LIU Guo-min ZHANG Xing-yi XU Chuan-jie ZHU xiao-min wang Jun LIU Yi Department of Ortiaopedics Department of Thoracic Surgery Changchun Jilin 130041 China

Based on in vivo research on the effect of the coating of the extracellular matrix composition of pedicle screws on the conduction and induction of bone formation in young sheep, the aim of this study was to investigate the application of coated pedicle screws in sheep with scoliosis whose spines are under constant development. Methods Four groups of pedicle screws were randomly implanted into bilateral L2-L5 pedicles of 2.5- to 3-month-old sheep. A static experiment was performed on one side and a loading test was performed on the other side by implanting connecting rods at the L2-L3 and L4-L5 segments. The changes in the force on the coated screws and the combination of the surface of the coated screws with the surrounding bone in the growth process of young sheep＇s spines with aging were observed. After 3 months, the lumbar vertebrae with the screws were removed and examined by micro-CT, histological, and biomechanical analyses. Results Under nonloading conditions, there is bone formation around the surfaces of coated screws. The bone forming on the surface of collagen/chondroitin sulfate/hydroxyapatite coating of pedicle screws is the most, the one of the collagen / chondroitin sulfate coating and hydroxyapatite coating is followed, and no significant difference between the two groups. In terms of the trabecular bone morphology parameters of the region of interest around the surface of the pedicle screws, such as bone mineral content, bone mineral density, tissue mineral content, tissue bone mineral density, bone volume fraction, and connection density, those associated with collagen/chondroitin sulfate/hydroxyapatite coatings are largest and those unassociated with coatings are smallest. Under nonloading conditions, the pullout strength of the collagen/chondroitin sulfate/hydroxyapatite-coated screws was largest, and that of the uncoated screws was minimal （P 〈0.01）. Under loading conditions, the maximum pullout strength of each group of pedicle screws was less

关键词： hydroxyapatite collagen chondroitin sulfate micro-CT biomechanics