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| 1 | A 3D hybrid grid generation technique and a multigrid/parallel algorithm based on anisotropic agglomeration approach显示文摘A hybrid grid generation technique and a multigrid/parallel algorithm are presented in this paper for turbulence flow simulations over three-dimensional (3D) complex geometries. The hybrid grid generation technique is based on an agglomeration method of anisotropic tetrahedrons. Firstly, the complex computational domain is covered by pure tetrahedral grids, in which anisotropic tetrahedrons are adopted to discrete the boundary layer and isotropic tetrahedrons in the outer field. Then, the anisotropic tetrahedrons in the boundary layer are agglomerated to generate prismatic grids. The agglomeration method can improve the grid quality in boundary layer and reduce the grid quantity to enhance the numerical accuracy and efficiency. In order to accelerate the convergence history, a multigrid/parallel algorithm is developed also based on anisotropic agglomeration approach. The numerical results demonstrate the excellent accelerating capability of this multigrid method. | Zhang Laiping Zhao Zhong Chang Xinghua He Xin | 2013 | Chinese Journal of Aeronautics2013，26，1： | 14 |
| 2 | A New Somphospondylan Sauropod (Dinosauria, Titanosauriformes) from the Late Cretaceous of Ganzhou, Jiangxi Province of Southern China显示文摘A new somphospondylan sauropod (Dinosauria, Titanosauriformes): Gannansaurus sinensis gen. et sp. nov. from the Late Cretaceous Nanxiong Formation of Ganzhou Basin, Jiangxi Province of southern China is erected based on one nearly complete dorsal vertebra and a mid-caudal vertebra. It is characterized by two centroprezygapophyseal lamina fossae; large, square-shaped concavity formed by centroprezygapophyseal lamina and dorsal margin of the centrum; large infraparapophyseal fossa; three openings present within the large lateral concavity, which occupy 65% length of the centrum; the posterior centroparapophyseal lamina (PCPL) and the anterior centroparapophyseal lamina (ACPL) weakly developed; the posterior centrodiapophyseal lamina (PCDL) separated by an infradiapophyseal fossa into two branches dorsally; parapophyseal and diapophyseal laminae cross to form 'K' configuration. It shares some characters with the Early Cretaceous form-Euhelopus, indicating that it is more closely related to Euhelopus rather than to other titanosauriform sauropods. This means Gannansaurus may have a close phylogenetic relationship with Euhelopus. | Lü Junchang YI Laiping ZHONG Hui WEI Xuefang | 2013 | Acta Geologica Sinica(English Edition)2013，87，3： | 5 |
| 3 | Orbit determination and time synchronization for BDS-3 satellites with raw inter-satellite link ranging observations显示文摘To provide competitive global positioning and timing services under the condition that monitoring stations are confined to Chinese territory,inter-satellite link(ISL)technology is used by the third-generation BeiDou Navigation Satellite System(BDS-3).The ISL,together with the dual one-way links between satellites and anchor stations,may enable autonomous navigation for BDS-3.In this paper,we propose a general observation model for orbit determination(OD)and time synchronization(TS)directly using non-simultaneous observations,such as raw ISL pseudoranges.With the proposed model,satellite orbits,clocks,and hardware delay biases of ISL equipment can be determined simultaneously by jointly processing inter-satellite one-way pseudorange data and observation data from ground monitoring stations.Moreover,autonomous OD and TS are also achievable with one-way pseudorange data from anchor stations and satellites.Data from eight BDS-3 satellites,two anchor stations,and seven monitoring stations located in China were collected to validate the proposed method.It is shown that by jointly processing data from the ISL and seven monitoring stations,the RMS of overlap orbit differences in radial direction is 0.019 m,the overlap clock difference(95%)is 0.185 ns,and the stability of the estimated hardware delay biases for each satellite is greater than 0.5 ns.Compared with the results obtained with the seven stations,the improvements of orbits in radial direction and clocks are 95.7%and 90.5%,respectively.When the hardware delay biases are fixed to predetermined values,the accuracies of orbits and clocks are further improved.By jointly processing pseudoranges from the satellites and the two anchor stations,the RMS of overlap orbit differences is 0.017 m in the radial direction,and the overlap clock difference(95%)is 0.037 ns.It has also been demonstrated that under the condition of one-way ranging links,the accuracies of orbits and clocks obtained by the above two modes are still significantly better than those obtained by using the data from the monitoring stations alone. | Rengui Ruan Xiaolin Jia Laiping Feng Jun Zhu Zongbo Huyan Jie Li Ziqing Wei | 2020 | Satellite Navigation2020，1，1： | 5 |
| 4 | Kinetic spectrophotometric determination of vanadium in steels based on the catalytic oxidation of thionine by potassium bromate显示文摘A sensitive and selective kinetic spectrophotometric method for the determination of V(V) was developed based on the catalytic oxidation of thionine by KBrO3 in 0.6 mol·L-1 H3PO4 medium. The linear calibration range and detection limit at 25°C were 0-0.5 μg·mL-1 and 0.01 μg·mL-1, respectively. In the presence of NaF and urea, most of the common ions did not interfere with the determination of V(V). The proposed method was applied for the determination of vanadium in steels and satisfactory results were obtained. | BAI Linshan ZHANG Wei LIU Xinhua LIANG Laiping | 2007 | Rare Metals2007，26，1： | 4 |
| 5 | A CFD-based numerical virtual flight simulator and its application in control law design of a maneuverable missile model显示文摘A CFD-based Numerical Virtual Flight(NVF)simulator is presented,which integrates an unsteady flow solver on moving hybrid grids,a Rigid-Body Dynamics(RBD)solver and a module of the Flight Control System(FCS).A technique of dynamic hybrid grids is developed to control the active control surfaces with body morphing,with a technique of parallel unstructured dynamic overlapping grids generating proper moving grids over the deflecting control surfaces(e.g.the afterbody rudders of a missile).For the flow/kinematic coupled problems,the 6 Degree-Of-Freedom(DOF)equations are solved by an explicit or implicit method coupled with the URANS CFD solver.The module of the control law is explicitly coupled into the NVF simulator and then improved by the simulation of the pitching maneuver process of a maneuverable missile model.A nonlinear dynamic inversion method is then implemented to design the control law for the pitching process of the maneuverable missile model.Simulations and analysis of the pitching maneuver process are carried out by the NVF simulator to improve the flight control law.Higher control response performance is obtained by adjusting the gain factors and adding an integrator into the control loop. | Laiping ZHANG Xinghua CHANG Rong MA Zhong ZHAO Nianhua WANG | 2019 | Chinese Journal of Aeronautics2019，32，12： | 4 |
| 6 | Satellite Positioning and Orbit Determination System(SPODS):Introduction and Evaluation显示文摘The Satellite Positioning and Orbit Determination System(SPODS)is a software package for GNSS positioning/orbit determination,developed by the Xi’an Research Institute of Surveying and Mapping.So far it has been able to analyse GPS data and has the capability of high precision GPS positioning and orbit determination.The underlying theory and the performance evaluation are briefly addressed in this paper.The experiments are carried out with GPS data collected from about 127 IGS stations during 4~10 January 2009.The results show that the RMS 1D difference is 1.1 cm between SPODS orbits and final IGS combined orbits,and that the repeatability of daily solutions of station coordinates is 1.5 mm for horizontal components,and 4.5 mm for vertical component,and that the consistency of ERP solutions with IGS final products is 0.025 mas,0.093 mas and 0.013 ms/d respectively for pole coordinates and LOD. | Ziqing WEI Rengui RUAN Xiaolin JIA Xianbing WU Xiaoyong SONG Yue MAO Laiping FENG Yongxing ZHU | 2018 | Journal of Geodesy and Geoinformation Science2018，1，1： | 4 |
| 7 | Analysis on the types of chemokines expressed by the murine thymic epithelial cell line MTEC1显示文摘Six kinds of chemokines including SDF-1α, IP-10, KG, RANTES, MCP-1 and Lymphotactin have been amplified using the primers designed by ourselves with RT-PCR from the total RNA of a medullary-type murine thymic epithelial cell line MTEC1 cells. The amplified cDNA fragments of the chemokines have been identified by nucleotide sequencing and Northern blot analysis. The results demonstrate that there are two different splicing forms of SDF-1 mRNA existing in MTEC1. The concentrated culture supernatant of MTEC1 shows an intermediate level of chemotaxis to CD4-CD8- thymocytes, which conforms to the biological function of SDF-1. | Laiping Xie Xiaoping Qian Sunyou Gong Weifeng Chen | 2000 | Chinese Science Bulletin2000，45，12： | 3 |
| 8 | Numerical investigation on aerodynamic performance of a bionic flapping wing显示文摘This paper numerically studies the aerodynamic performance of a bird-like bionic flapping wing.The geometry and kinematics are designed based on a seagull wing,in which flapping,folding,swaying,and twisting are considered.An in-house unsteady flow solver based on hybrid moving grids.is adopted for unsteady flow simulations.We focus on two main issues in this study,i.e.,the influence of the proportion of down-stroke and the effect of span-wise twisting.Numerical results show that the proportion of downstroke is closely related to the efficiency of the flapping process.The preferable proportion is about 0.7 by using the present geometry and kinematic model,which is very close to the observed data.Another finding is that the drag and the power consumption can be greatly reduced by the proper span-wise twisting.Two cases with different reduced frequencies are simulated and compared with each other.The numerical results show that the power consumption reduces by more than 20%,and the drag coefficient reduces by more than 60% through a proper twisting motion for both cases.The flow mechanism is mainly due to controlling of unsteady flow separation by adjusting the local effective angle of attack.These conclusions will be helpful for the high-performance micro air vehicle (MAV) design. | Xinghua CHANG Laiping ZHANG Rong MA Nianhua WANG | 2019 | Applied Mathematics and Mechanics(English Edition)2019，40，11： | 3 |
| 9 | An efficient large-scale mesh deformation method based on MPI/Open MP hybrid parallel radial basis function interpolation显示文摘An efficient MPI/OpenMP hybrid parallel Radial Basis Function (RBF) strategy for both continuous and discontinuous large-scale mesh deformation is proposed to reduce the computational cost and memory consumption.Unlike the conventional parallel methods in which all processors use the same surface displacement and implement the same operation,the present method employs different surface points sets and influence radius for each volume point movement,accompanied with efficient geometry searching strategy.The deformed surface points,also called Control Points (CPs),are stored in each processor.The displacement of spatial points is interpolated by using only 20-50 nearest control points,and the local influence radius is set to 5-20 times the maximum displacement of control points.To shorten the searching time for the nearest control point clouds,an Alternating Digital Tree (ADT) algorithm for 3D complex geometry is designed based on an iterative bisection technique.Besides,an MPI/OpenMP hybrid parallel approach is developed to reduce the memory cost in each High-Performance Computing (HPC) node for large-scale applications.Three 3D cases,including the ONERA-M6 wing and a commercial transport airplane standard model with up to 2.5 billion hybrid elements,are used to test the present mesh deformation method.The robustness and high parallel efficiency are demonstrated by a wing deflection case with a maximum bending angle of 450 and more than 80% parallel efficiency with 1024 MPI processors.In addition,the availability for both continuous and discontinuous surface deformation is verified by interpolating the projecting displacement with opposite directions surface points to the spatial points. | Zhong ZHAO Rong MA Lei HE Xinghua CHANG Laiping ZHANG | 2020 | Chinese Journal of Aeronautics2020，33，5： | 3 |
| 10 | Applications of multi-dimensional schemes on unstructured grids for high-accuracy heat flux prediction显示文摘The simulation of hypersonic flows with fully unstructured(tetrahedral)grids has severe problems with respect to the prediction of stagnation region heating,due to the random face orientation without alignment to the bow shock.To improve the accuracy of aero-heating predictions,three multi-dimensional approaches on unstructured grids are coupled in our Reynolds-averaged Navier-Stokes(RANS)solver,including multi-dimensional upwind flux reconstruction(MUP),multi-dimensional limiter(MLP-u2)and multi-dimensional gradient reconstruction(MLR).The coupled multi-dimensional RANS solver is validated by several typical verification and validation(V&V)cases,including hypersonic flows over a cylinder,a blunt biconic,and a double-ellipsoid,with commonly used prism/tetrahedral hybrid grids.Finally,the coupled multi-dimensional solver is applied to simulating the heat flux distribution over a 3D engineering configuration,i.e.a Hermes-like space shuttle model.The obtained numerical results are compared with experimental data.The predicted results demonstrate that the coupled multi-dimensional approach has a good prediction capability on aerodynamic heating over a wide range of complex engineering configurations. | Yunbo Wan Nianhua Wang Laiping Zhang Yewei Gui | 2020 | Acta Mechanica Sinica2020，36，1： | 2 |
| 11 | Uncombined precise orbit and clock determination of GPS and BDS-3显示文摘There is increasing concern about the uncombined(UC)observation model in the field of global navigation satellite system(GNSS).Based on the global positioning system(GPS)and the third-generation BeiDou navigation satellite system(BDS-3),this study processed the UC precision orbit determination(POD)for single and dual systems.First,a UC observation model suitable for multi-GNSS POD was derived,and the ionospheric-free(IF)combination observation model was presented.Although the ambiguity parameters of UC and IF strategies were different after reparameterization,the difference could be removed when processing ambiguity resolution,and the equivalence was proved theoretically.To demonstrate the accuracy of BDS-3 orbits fully,the observation data of approximately 1 month were selected for determining the precise orbit for global positioning system(GPS)only,BDS-3 only,and GPS/BDS-3 systems based on the UC and IF models.The orbit precision of BDS-3 satellites was validated by using metrics,including comparison with precision products released by Wuhan University,orbit boundary discontinuity,and satellite laser ranging(SLR)residuals.The results show that the orbit accuracies of the IF and UC models are almost the same,the difference in orbits is approximately several millimeters,and the clock difference is within 0.01 ns.The GPS/BDS-3 combined solution shows better accuracy compared to other solutions.The average accuracies in the R and 3D directions are approximately 4 and 15 cm,and the clock standard deviation is approximately 0.2 ns compared to external orbit product.The root mean square of SLR residuals is approximately 4 cm. | Tian Zeng Lifen Sui Rengui Ruan Xiaolin Jia Laiping Feng | 2020 | Satellite Navigation2020，1，1： | 2 |
| 12 | Accuracy analysis of gradient reconstruction on isotropic unstructured meshes and its effects on inviscid flow simulation显示文摘The accuracy of gradient reconstruction methods on unstructured meshes is analyzed both mathematically and numerically.Mathematical derivations reveal that,for gradient reconstruction based on the Green-Gauss theorem(the GG methods),if the summation of first-and-lower-order terms does not counterbalance in the discretized integral process,which rarely occurs,second-order accurate approximation of face midpoint value is necessary to produce at least first-order accurate gradient.However,gradient reconstruction based on the least-squares approach(the LSQ methods)is at least first-order on arbitrary unstructured grids.Verifications are performed on typical isotropic grid stencils by analyzing the relationship between the discretization error of gradient reconstruction and the discretization error of the face midpoint value approximation of a given analytic function.Meanwhile,the numerical accuracy of gradient reconstruction methods is examined with grid convergence study on typical isotropic grids.Results verify the phenomenon of accuracy degradation for the GG methods when the face midpoint value condition is not satisfied.The LSQ methods are proved to be at least first-order on all tested isotropic grids.To study gradient accuracy effects on inviscid flow simulation,solution errors are quantified using the Method of Manufactured Solutions(MMS)which was validated before adoption by comparing with an exact solution case,i.e.,the 2-dimensional(2D)inviscid isentropic vortex.Numerical results demonstrate that the order of accuracy(OOA)of gradient reconstruction is crucial in determining the OOA of numerical solutions.Solution accuracy deteriorates seriously if gradient reconstruction does not reach first-order. | Nianhua Wang Ming Li Rong Ma Laiping Zhang | 2019 | Advances in Aerodynamics2019，1，1： | 1 |
| 13 | Real-Time Seam Tracking Technology of Welding Robot with Visual Sensing显示文摘 | Hongyuan Shen Tao Lin Shanben Chen Laiping Li | 2010 | Journal of Intelligent & Robotic Systems (-)2010，，3： | 1 |
| 14 | The relationship between slip behavior and dislocation arrangement for large-size Mo-3Nb single crystal at room temperature显示文摘The slip behavior and mechanism of large-size Mo-3Nb single crystal have been investigated and disclosed comprehensively at room temperature by quasi-static compression with various strains.With the increase of deformation,the slip traces change from shallow non-uniform slip lines to dense and uniform slip bands.Different slip traces in the same deformation condition were observed,suggesting that the slip traces in the single crystal are controlled by different types and arrangement mechanisms of mobile dislocation.To clarify the relationship between slip behavior and dislocation arrangement,TEM and AFM analyses were performed.Significant discrepancy between the mobility of screw segments and edge segments caused by double cross-slip multiplication mechanism is the reason why different slip features were witnessed.During the whole slip deformation process,screw dislocations play a dominant role and they are inclined to form wall-substructures by interaction and entanglement.With the development of dislocation accumulation,the entangled dislocation walls evolve into dislocation cells with higher stability. | Benqi Jiao Qinyang Zhao Yongqing Zhao Laiping Li Zhongwu Hu Xuanqiao Gao Wen Zhang Jianfeng Li | 2021 | Journal of Materials Science & Technology2021，，33： | 1 |
| 15 | Critical Thinking Disposition of Hong Kong Chinese and Australian Nursing Students显示文摘 | Tiwaria A Avery A Laip | 2003 | Journal of Advanced Nursing2003，44，3： | 1 |
| 16 | Death rat es an d causes of death in pat ient s with rheumat oid arth riti s:a populationbased study显示文摘 | S ihvonen S Korpel a M Laip pala P | | 0，，04： | 1 |
| 17 | Flexible service selection with user-specific QoS support in serv- ice-oriented architecture 显示文摘 | ZHAO Laiping REN Yizhi LI Mingchu | 2012 | Journal of Network Computer Applications2012，35，3： | 1 |
| 18 | Real- Time Seam Tracking Technology of Welding Robot with Visual Sensing显示文摘 | Hongyuan Shen Tao Lin Shanben Chen Laiping Li | 2010 | Journal of Intelligent and Robotic Systems2010，59，34： | 1 |
| 19 | A series of coordination polymers constructed from flexible bis(benzimidazole)ether ligands and different carboxylates显示文摘Six new coordination polymers constructed from two structurally related ligands, 2,2′-bis(2-methylbenzimidazole)ether (L1) and 2,2′-bis(2-ethylbenzimidazole)ether (L2), have been synthesized. They are [Cu(L1)(bz)2] (1), [Cu(L2)(bz)2] (2), [Zn2(L1)(m-bdc)2] (3), [Cd2(L2)(m-bdc)2(H2O)]2·H2O (4), [Zn(L1)(OH-bdc)-(H2O)] (5) and [Zn2(L2)(btca)] (6), where Hbz = benzoic acid, m-H2bdc = 1,3-benzenedicarboxylic acid, OH-H2bdc = 5-hydroxyisophthalic acid, and H4btca = 1,2,4,5-benzenetetracarboxylic acid. In 1 and 2, the bidentate N-donor ligands (L1 and L2) bridge neighboring metal centers to form 1D single chains. The bz anions are attached on both sides of the chains. In 3 and 4, the N-donor ligands (L1 and L2) in cis conformations bridge two metal centers to generate a [M2(L1)]4+ unit (M = Zn(Ⅱ) and Cd(Ⅱ)). The adjacent [M2(L1)]4+ units are further linked via the dicarboxylate anions to form 1D double chain structures. In 5, the Zn(Ⅱ) cations are bridged by OH-m-bdc anions to form an infinite polymeric chain. The L1 ligands are attached on one side of the chain in a monodentate mode. In 6, two Zn(Ⅱ) cations are bridged by two L2 ligands to form a [ZnL2]24+ ring, which is further linked by btca anions to generate a 2D layer. The luminescent properties of the ligands and 3―6 in the solid state at room temperature were also studied. | Hua Wu LaiPing Zhang HaiYan Liu Jin Yang JianFang Ma | 2009 | Science China Chemistry2009，52，9： | 1 |
| 20 | Antigen uptake and trafficking in human intestinal epithelial cells 显示文摘 | Laiping So A Pelton-Henrion K Small G | 2000 | Dig Dis Sci2000，45，7： | 1 |
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