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Global Existence of the Radially Symmetric Strong Solution to Navier-Stokes-Poisson Equations for Isentropic Compressible Fluids

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Acta Mathematica Sinica,English Series 2009年第10期25卷 1703-1720页

作者： Jun ping YIN Zhong tan Department of Mathematics Xiamen University Xiamen 361005 P. R. China

We prove the two existence results of the radially symmetric strong solutions to the Navier- Stokes-Poisson equations for isentropic compressible fluids. The important point in this paper is that the initial density i... 详细信息

关键词： Navier-Stokes-Poisson equations annular domain radially symmetric solution strong solution existence

Geodynamic processes of the continental deep subduction: Constraints from the fine crustal structure beneath the Pamir plateau

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Science China Earth Sciences 2020年第5期63卷 649-661页

作者： Wei LI Yun CHEN ping tan Xiaohui YUAN State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China Institute of Disaster Prevention Sanhe 065201China Deutsches GeoForschungsZentrum GFZ Telegrafenberg14473 PotsdamGermany

The Pamir plateau,located north of the western syntaxis of the India-Eurasia collision system,is regarded as one of the most possible places of the ongoing continental deep *** on a N-S trending linear seismic array across the Pamir plateau,we use the methods of the harmonic analysis of receiver functions and the cubic spline interpolation of surface wave dispersions to coordinate their resolutions,and perform a joint inversion of these datasets to construct a 2-D S-wave velocity model of the crust and uppermost mantle there.A spatial configuration among the intermediate-depth seismicity,Moho topography,and low-velocity anomalies within the crust and upper mantle is revealed,which provides new seismological constraints on the geodynamic processes of the continental *** results not only further confirm the deep subduction of the Asian continental lower crust beneath the Pamir plateau,but also indicate the importance of the metamorphic dehydration of the subducting continental crustal material in the genesis of the intermediate-depth seismicity and the crustal deformation.

关键词： Pamir plateau Continental deep subduction Intermediate-depth seismicity Low-velocity zone Receiver function Ambient noise Joint inversion

Structural,electronic,and magnetic behaviors of 5d transition metal atom substituted divacancy graphene：A first-principles study

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Chinese Physics B 2017年第5期26卷 304-312页

作者： Rafique Muhammad 帅永 He-ping tan Hassan Muhammad School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 China Mehran University of Engineering and Technology S.Z.A.B Campus Khairpur Mir' s Sindh Pakistan

Structural, electronic, and magnetic behaviors of 5d transition metal（TM） atom substituted divacancy（DV） graphene are investigated using first-principles calculations. Different 5d TM atoms（Hf, Ta, W, Re, Os, Ir, and Pt） are embedded in graphene, these impurity atoms replace 2 carbon atoms in the graphene sheet. It is revealed that the charge transfer occurs from 5d TM atoms to the graphene layer. Hf, Ta, and W substituted graphene structures exhibit a finite band gap at high symmetric K-point in their spin up and spin down channels with 0.783 μB, 1.65 μB, and 1.78 μB magnetic moments,respectively. Ir and Pt substituted graphene structures display indirect band gap semiconductor behavior. Interestingly, Os substituted graphene shows direct band gap semiconductor behavior having a band gap of approximately 0.4 e V in their spin up channel with 1.5 μB magnetic moment. Through density of states（DOS） analysis, we can predict that d orbitals of 5d TM atoms could be responsible for introducing ferromagnetism in the graphene layer. We believe that our obtained results provide a new route for potential applications of dilute magnetic semiconductors and half-metals in spintronic devices by employing 5d transition metal atom-doped graphene complexes.

关键词： substituted impurity symmetric dilute complexes monolayer Fermi replace polarized doping

Collaborative visual SLAM for multiple agents:A brief survey

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Virtual Reality & Intelligent Hardware 2019年第5期1卷 461-482页

作者： Danping ZOU ping tan Wenxian YU Shanghai Key Laboratory of Navigation and Location-Based Services Shanghai Key Laboratory of Intelligent Sensing and RecognitionShanghai Jiao Tong UniversityShanghai 200240China School of Computing Science Simon Fraser UniversityBurnaby V5A 1S6Canada

This article presents a brief survey to visual simultaneous localization and mapping (SLAM) systems applied to multiple independently moving agents, such as a team of ground or aerial vehicles, a group of users holding augmented or virtual reality devices. Such visual SLAM system, name as collaborative visual SLAM, is different from a typical visual SLAM deployed on a single agent in that information is exchanged or shared among different agents to achieve better robustness, efficiency, and accuracy. We review the representative works on this topic proposed in the past ten years and describe the key components involved in designing such a system including collaborative pose estimation and mapping tasks, as well as the emerging topic of decentralized architecture. We believe this brief survey could be helpful to someone who are working on this topic or developing multi-agent applications, particularly micro-aerial vehicle swarm or collaborative augmented/virtual reality.

关键词： Visual SLAM Multiple agent UAV swarm Collaborative AR/VR

Improving the Seismic Performance of Staircases in Building Structures with a Novel Isolator

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Computer Modeling in Engineering & Sciences 2020年第8期124卷 415-431页

作者： Yafei Zhang ping tan Haitao Ma Marco Donà Key Laboratory of Earthquake Resistance Earthquake Mitigation and Structural SafetyMinistry of EducationGuangzhou UniversityGuangzhou510405China Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology Guangzhou UniversityGuangzhou510405China

A staircase provides the main escape way from a building in an ***,it may suffer severe damages or even collapse during an *** improving the seismic performance of staircases,this paper proposes an innovative staircase isolator with the features of lightweight,costeffective and ease of construction and replacement,which is formed by suitable engineering plastic shims between rubber layers.A connection construction scheme is also proposed for the isolated *** performance tests have been carried out to characterize the isolator in terms of mechanic behavior and ultimate *** test results show that mechanical properties of the proposed staircase isolator are excellent and suitable for staircase in building *** order to investigate the influence of staircase on building structural responses,time history analyses of a typical building structure without staircase(WS),with fixed staircase(FS)and with isolated staircase(IS)are conducted and compared within the environment of *** show that staircase isolation can effectively eliminate the diagonal bracing effect of staircase slab and make structural components uniformly *** the novel isolator is employed for staircase in a building structure,there is no vulnerable position in staircase and the performance of staircase in building structure can be greatly enhanced.

关键词： Seismic isolation seismic performance of staircases staircase isolation engineering-plastics rubber isolator rubber isolator

Optimal Design of Transmission Characteristics for Hexagonal Coil Wireless Power Transfer System Based on Genetic Algorithm

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Chinese Journal of Electrical Engineering 2023年第2期9卷 94-106页

作者： ping’an tan Bin Song Xu Shangguan Huadong Liu School of Automation and Electronic Information Xiangtan UniversityXiangtan 411105China CRRC Zhuzhou Electric Locomotive Research Institute Co. Ltd.Zhuzhou 412001China

Effective optimization methods are used to guide the optimal design of coil parameters,which is significant for improving the transmission performance of the wireless power transfer(WPT)*** methods mostly rely on the exhaustive attack method and finite element analysis(FEA)to achieve the coil parameter design,which have the disadvantages of complex modeling and *** overcome these limitations,this study proposes an optimization strategy based on the genetic algorithm(GA),which considers the actual requirements of the efficiency and power of the WPT ***,a direct integration method is proposed to simplify the analytical solution process of the mutual inductance between the hexagonal *** on the mutual inductance model,the transmission characteristics of the hexagonal coil WPT system are deeply analyzed by the control variable *** importantly,with the proposed optimization objective function and its constraints,the GA is used to automatically achieve multi-parameter optimization of the hexagonal ***,a 500 W WPT system experimental platform is established,and the experimental results verify the feasibility of the proposed optimization method.

关键词： Wireless power transfer(WPT) hexagonal coil misalignment optimal design genetic algorithm(GA)

Solubility of red palm oil in supercritical carbon dioxide： Measurement and modelling

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Chinese Journal of Chemical Engineering 2018年第5期26卷 964-969页

作者： Wan Jun Lee Chin ping tan Rabiha Sulaiman Gun Hean Chong Department of Food Technology Faculty of Food Science and Technology Universiti Putra Malaysia 43400 Serdang Selangor Malaysia Supercritical Fluid Centre (SFC) Faculty of Food Science and Technology Universiti Putra Malaysia 43400 Serdang Selangor Malaysia

The solubility of red palm oil （RPO） in supercritical carbon dioxide （scCO2） was determined using a dynamic method at 8.5-25 MPa and, 313.15-333.15 K and at a fixed scCO2 flow rate of 2.9 g. mn -1 using a full factorial design. The solubility was determined under low pressures and temperatures as a preliminary study for RPO par- ticle formation using scCO2. The solubility of RPO was 0.5-11.3 mg. （g CO2） -1 and was significantly affected by the pressure and temperature. RPO solubility increased with pressure and decreased with temperature. The Adachi-Lu model showed the best-fit for RPO solubility data with an average relative deviation of 14% with a high coefficient of determination, R2 of 0.9667, whereas the Peng-Robinson equation of state thermodynamic model recorded deviations of 17%-30%.

关键词： Solubility Supercritical carbon dioxide Mathematical modelling Thermodynamics Palm oil

A New Approach to Development of Composite Web Services

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Wuhan University Journal of Natural Sciences 2006年第1期11卷 211-216页

作者： YANG Yan-ping tan Qing-ping YU Jin-shan LIU Feng College of Computer National University of Defense Technology Changsha 410073 Hunan China

With the requirement for complex Web Services steadily increasing, there is a growing interest for reusing basic, existing Web Services to composite new ones. We present a composite Web Services development approach driven by model driven architecture （MDA） ,using UML（Unified Modeling Language） class diagram to model structure HM （Plateform Independent Platform） and UML activity diagram to model behavior PIM, then by model transformation converting the PIMs to specific Web Services specification platforms and execution platform to get the corresponding PSMs （platform specific models）. The main contributions of this paper are the all-around solution to Web Services composition development and the transformation rules for structure and behavior model of Web Services between PIMs and PSMs.

关键词： Web service composition MDA model transformation UML

Determination of multiaxial stress rupture criteria for creeping materials:A critical analysis of different approaches

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Journal of Materials Science & Technology 2023年第6期137卷 14-25页

作者： Kun Zhang Jian-ping tan Wei Sun Kamran Nikbin Shan-Tung Tu Key Laboratory of Pressure Systems and Safety(Ministry of Education) School of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai200237China Department of Mechanical Materials and Manufacturing EngineeringUniversity of NottinghamNottinghamNG72RDUK Department of Mechanical Engineering Imperial College LondonLondonSW72AZUK

Materials in engineering applications are rarely *** reality,failures under multiaxial loading has been widely observed in engineering *** life prediction of a component under multiaxial stresses has long been a challenging issue,particularly for high temperature *** distinguish the mode of failure ranging from a maximum principal stress intergranular damage to von Mises effective stress rupture mode a multiaxial stress rupture criterion(MSRC)was originally proposed by Sdobyrev and then Hayhurst and Leckie(SHL MSRC).A multiaxial-factor,α,was developed as a result which was intended to be a material constant and differentiates the bias of the MSRC between maxi-mum principal stress and effective *** success of the SHL MSRC relies on accurately calibrating the value ofαto quantify the multiaxial response of the material/geometry *** find a more suitable approach for determining MSRC,the applicability of different methods are *** that the resulting analysis of the various approaches can be affected by the creep failure mechanism,princi-ples in the determination of MSRC with and without using continuum damage mechanics approaches are *** viability of uniaxial material parameters in correlating withαthrough the analysis of available data in literature is also *** is found that the increase of the uniaxial creep dam-age tolerance parameterλis accompanied bythe decreaseof theα-value,whichimplies thatthe creep ductility plays an important role in affecting the multiaxial rupture behavior of materials.

关键词： Multiaxial stress rupture criterion Creep failure mechanism Uniaxial parameter Creep damage tolerance parameter Continuum damage mechanics