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A Seroprevalence Survey of Maedi-Visna Among Twenty-Four Ovine Floks from Twelve Regions of China

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Journal of Integrative Agriculture 2013年第12期12卷 2321-2323页

作者： ZHANG Ke-shan HE Ji-jun liu Yong-jie SHANG You-jun liu xiang-tao State Key Laboratory of Veterinary Etiological Biology/National Foot and Mouth Disease Reference Laboratory Lanzhou Veterinary Research InstituteChinese Academy of Agricultural Sciences

Maedi-visna virus（MVV） is an ovine lentivirus that is widespread in many countries *** clinical and subclinical MVV infections cause substantial economic *** infection in live sheep is usually diagnosed serologically,with antibody-positive sheep being regarded as *** have been few reports of maedi-visna in China,with no detailed epidemic analysis of MVV infection in ovine *** order to investigate the seroprevalence and spatial distribution of maedi-visna among ovine flocks in China,a total of 672 serum samples were collected from different ovine flocks in 12 regions（provinces,autonomous regions or municipalities） of China in 2011,and serum antibody levels were determined using a commercial ELISA *** study represents the first investigation of the seroepidemiology of maedi-visna in China,indicating a circulation of MMV among sheep.

关键词： seroprevalence spatial distribution maedi-visna

Expression of the Capsid Precursor Protein gene of Foot-and-mouth Disease Virus and Green Fluorescent Protein Gene in BHK-21 Cells Mediated by Retroviral Vector

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畜牧兽医学报 2010年第S1期41卷 70-75页

作者： LI Jiong liu Yan-hong AN Fang-lan liu Jun-lin liu xiang-tao SHANG You-jun YIN Hong State Key Laboratory of Veterinary Etiological Biology Key Laboratory of Animal Virology of Ministry of AgricultureLanzhou Veterinary Research InstituteChinese Academy of Agricultural SciencesLanzhou 730046China

We have constructed a retroviral vector mediated mammalian cell expression system of the capsid precursor protein of foot-and-mouth disease virus(FMDV).The recombinant retroviral vector pBABEpuro-P1-2A-EGFP was constructed by sequentially inserting capsid precursor protein gene(P1) of FMDV and enhanced green fluorescent protein gene(EGFP) into *** recombinant retroviral vector and the pVSV-G plasmid were co-transfected into packaging cells(GP2-293) by liposomemediated transduction to produce the *** pseudovirus was used to infect BHK-21 cells and resistant cells were screened with *** fluorescent proteins were observed by fluorescence microscopy and expression of the capsid precursor protein gene of FMDV was detected by indirect *** recombinant retroviral vector pBABEpuro-P1-2A-EGFP was constructed *** capsid precursor protein of FMDV and green fluorescent protein were expressed in BHK-21 *** mammalian cell expression system for the capsid precursor protein of FMDV has been constructed successfully,which lays the foundation of development of a FMDV subunit vaccine.

关键词： retroviral vector FMDV capsid precursor protein gene green fluorescent protein gene BHK-21 cell

Pre-combustion mercury removal with co-production of hydrogen via coal electrolysis

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Journal of Environmental Sciences 2024年第2期136卷 382-389页

作者： xiang Lyu Runming tao Tianyu Zhang Chemical and Biomolecular Engineering Department Ohio University165 Stocker CenterAthensOH45701USA Electrification and Energy Infrastructures Division Oak Ridge National LaboratoryOak RidgeTN37831USA Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Engineering Research Center for Water Pollution Source Control&Eco-remediation College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China

Pre-combustion mercury removal via coal electrolysis was performed and investigated on a bench-scale coal electrolytic cell(CEC)systemically,and factorial design was used to determine the effect of different operating conditions(coal particle size,operating temperature,operating cell voltage,and flow rate of slurry)on the percentage of mercury removal,percentage of ash removal,and dry heating value *** results showed that the operating cell voltage,as well as the interaction between operating cell voltage and coal particle size,are significant factors in the percentage of mercury *** is no significant factor in the percentage of ash removal and the dry heating value change,but the coal could be purified while keeping the dry heating value almost constant after electrolysis.A co-product of hydrogen could be produced during coal electrolysis with 50%lower energy consumption compared with water ***,a mechanism for mercury removal in coal was *** facts indicate that coal electrolysis is a promising method for precombustion mercury removal.

关键词： Pre-combustion mercury removal Coal electrolysis Ash removal Dry heating value Hydrogen production

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常见筋板样式对球阀活门刚度影响的仿真分析

机械工程与自动化 2024年第4期 50-52页

作者：薛子萱黄钢匡振东刘向涛赵堑天津机电职业技术学院天津300350 天津国际机械有限公司天津300300 山推工程机械股份有限公司山东济宁272000

采用整体分析和单独分析两种方法,分别建立了水电球阀的整体有限元模型和活门的单独有限元模型,对比分析这两种分析法结果的吻合度。采用单独分析方法建立十字靶环形、十字形、川字形、井字形4种筋板样式活门的有限元模型,研究4种常见... 详细信息

采用整体分析和单独分析两种方法,分别建立了水电球阀的整体有限元模型和活门的单独有限元模型,对比分析这两种分析法结果的吻合度。采用单独分析方法建立十字靶环形、十字形、川字形、井字形4种筋板样式活门的有限元模型,研究4种常见筋板样式对活门刚度的影响。研究结果表明:十字靶环形筋板增加活门刚度的效果最显著;采用单独分析方法求解高效,分析结论可靠。

关键词：球阀活门筋板仿真分析

Numerical investigation on compressible flow around a cylinder in proximity to the heated wall

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Journal of Hydrodynamics 2024年第3期36卷 519-533页

作者： Yu-lu liu Jun-wang Qu Yi-zhou tao Yong-guang Lyu xiang Qiu Shanghai Institute of Technology School of ScienceShanghai201418China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai200072China

In this study,direct numerical simulations were conducted to investigate the compressible flow around a circular cylinder near a heated wall at a Reynolds number(Re)of 500 and a Mach number(Ma)of *** heating ratio T^(*)ranging from 1.0 to 1.6 represents the different situations of a heated wall,whereas the gap ratio ranges from 0.3 to *** study analyzed the impact of heating effect and wall proximity on flow characteristics and aerodynamic *** results indicated that the stability of the flow was enhanced as the gap ratio decreased or the heating ratio *** the calculation of enstrophy,it was found that the strength of shedding vortices weakens with a decrease in gap ratio or an increase in heating ***,the mean drag coefficient decreases as the heating ratio increases or the gap ratio *** contrast,the mean lift coefficient initially decreases and then increases as the gap ratio ***,the drag reduction mechanism was analyzed by examining the pressure distribution on the surface of the cylinder.

关键词： Compressible flow wall proximity heating effect stability enstrophy

A cooling wound dressing for accelerating healing under sunlight

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The Innovation 2024年第5期5卷 13-14页

作者： He Yu Mingxiang liu xiang Lu Jinping Qu Guangming tao State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and Engineering and Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Vascular Aging Ministry of EducationTongji Hospital Tongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Key Laboratory of Material Chemistry for Energy Conversion and Storage School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan430074China National Engineering Research Center of Novel Equipment for Polymer Processing Key Laboratory of Polymer Processing Engineering of Ministry of EducationSouth ChinaUniversity of TechnologyGuangzhou 510641China

Wound healing is greatly influenced by the local skin environment,encompassing factors such as temperature and ***,the inadequate thermal regulation exhibited by traditional wound dressings can significantly impede the healing process,particularly when they are exposed to the intense heat of *** recent years,however,researchers have developed a groundbreaking daytime radiative cooling(DRC)dressing that is specifically designed to prevent wound overheating in hot outdoor *** innovative dressing creates an optimal wound microenvironment,effectively reducing inflammation and subsequently accelerating the healing *** represents a significant leap forward in mitigating the deleterious effects of sunlight on wound healing,thus propelling the progress and enhancement of biomedical solutions for extreme environments conditions.

关键词： healing wound dressing

A Novel Design of a Pre-separation Panel Structure to Protect Against the Impact of an Explosion in an Aircraft Plenum Chamber

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Acta Mechanica Solida Sinica 2024年第1期37卷 166-180页

作者： Zongxing liu xiang Yang Jun liu School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China COMAC Shanghai Aircraft Design and Research Institute Shanghai 201210China

To reduce the damage of the pressurizing panel structure of a fuselage caused by an explosion at the“least risk bomb location”in an aircraft structure,a new pre-separation panel structure was designed to resist blast ***,the dynamic strain response and morphology of impact damage of the new pre-separation panel were measured in an impact damage ***,the commercial software LS-DYNA was used to calculate the propagation of the blast shock wave,and the results were compared with empirical equations to verify the rationality of the numerical calculation ***,the fluid–structure coupling method was used to calculate the damage process of the pre-separation panel structure under the impact of an explosion wave and an impact *** calculated results were in good agreement with the test results,which showed the rationality of the calculation method and the *** residual strength of the damaged pre-separation panel was significantly higher than that of the original damaged *** results show that the new pre-separation panel structure is reasonable and has certain significance for guiding the design of plenum chambers with strong resistance to implosion for aircraft fuselages.

关键词： Pre-separation panel structure Explosive response Residual strength Aircraft plenum chamber Least risk bomb location

Practical cloud storage auditing using serverless computing

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Science China(Information Sciences) 2024年第3期67卷 33-47页

作者： Fei CHEN Jianquan CAI tao xiang Xiaofeng LIAO College of Computer Science and Software Engineering Shenzhen University College of Computer Science Chongqing University

Cloud storage auditing research is dedicated to solving the data integrity problem of outsourced storage on the cloud. In recent years, researchers have proposed various cloud storage auditing schemes using different techniques. While these studies are elegant in theory, they assume an ideal cloud storage model;that is, they assume that the cloud provides the storage and compute interfaces as required by the proposed schemes. However, this does not hold for mainstream cloud storage systems because these systems only provide read and write interfaces but not the compute interface. To bridge this gap, this work proposes a serverless computing-based cloud storage auditing system for existing mainstream cloud object storage. The proposed system leverages existing cloud storage auditing schemes as a basic building block and makes two adaptations. One is that we use the read interface of cloud object storage to support block data requests in a traditional cloud storage auditing scheme. Another is that we employ the serverless computing paradigm to support block data computation as traditionally required. Leveraging the characteristics of serverless computing, the proposed system realizes economical, pay-as-you-go cloud storage auditing. The proposed system also supports mainstream cloud storage upper layer applications(e.g., file preview) by not modifying the data formats when embedding authentication tags for later auditing. We prototyped and open-sourced the proposed system to a mainstream cloud service, i.e., Tencent Cloud. Experimental results show that the proposed system is efficient and promising for practical use. For 40 GB of data, auditing takes approximately 98 s using serverless computation. The economic cost is 120.48 CNY per year, of which serverless computing only accounts for 46%. In contrast, no existing studies reported cloud storage auditing results for real-world cloud services.

关键词： cloud storage auditing serverless computing object storage usability

Review of dynamics and active control of large-scale space membrane antenna

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Astrodynamics 2024年第1期8卷 1-26页

作者： xiang liu Guoping Cai Department of Engineering Mechanics MOE Key Laboratory of HydrodynamicsChongqing Research InstituteShanghai Jiao Tong UniversityShanghai200240China

Large-scale space membrane antennas have significant potential in satellite communication,space-based early warning,and Earth *** of their large size and high flexibility,the dynamic analysis and control of membrane antenna are *** maintain the working performance of the antenna,the pointing and surface accuracies must be strictly ***,the accurate dynamic modeling and effective active control of large-scale space membrane antennas have great theoretical significance and practical value,and have attracted considerable interest in recent *** paper reviews the dynamics and active control of large-scale space membrane ***,the development and status of large-scale space membrane antennas are ***,the key problems in the dynamics and active control of large membrane antennas,including the dynamics of wrinkled membranes,large-amplitude nonlinear vibration,nonlinear model reduction,rigid-flexible-thermal coupling dynamic modeling,on-orbit modal parameter identification,active vibration control,and wave-based vibration control,are discussed in ***,the research outlook and future trends are presented.

关键词： large-scale space membrane antenna dynamicmodeling active control