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81篇 您的检索式:作者名="Flight"
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1A numerical study of the South China Sea deep circulation and its relation to the Luzon Strait transport显示文摘A fine-resolution MOM code is used to study the South China Sea basin-scale circulation and its relation to the mass transport through the Luzon Strait. The modal domain includes the South China Sea, part of the East China Sea, and part of the Philippine Sea so that the currents in the vicinity of the Luzon Strait are free to evolve. In addition, all channels between the South China ,Sea and the Indonesian seas are closed so that the focus is on the Luzon Strait transport. The model is driven by specified Philippine Sea currents and by surface heat and salt flux conditions. For simplicity, no windstress is applied at the surface.The simulated Luzon Strait transport and the South China Sea circulation feature a sandwich vertical structure from the surface to the bottom. The Philippine Sea water is simulated to enter the South China Sea at the surface and in the deep ocean and is carried to the southern basin by western boundary currents. At the intermediate depth, the net Luzon Strait transport is out of the South China Sea and is fed by a western boundary current flowing to the north at the base of the thermocline. Corresponding to the western boundary currents, the basin circulation of the South China Sea is cyclonic gyres at the surface and in the abyss but an anti-cyclonic gyre at the intermediate depth. The vorticity balance of the gyre circulation is between the vortex stretching and the meridional change of the planetary vorticity.Based on these facts, it is hypothesized that the Luzon Strait transports are determined by the diapycnal mixing inside the entire South China Sea. The South China Sea plays the role of a 'mixing mill' that mixes the surface and deep waters to return them to the Luzon Strait at the intermediate depth. The gyre structures are consistent with the Stommel and Arons theory (1960), which suggests that the mixlng-induced circulation inside the South China Sea should be cyclonic gyres at the surface and at the bottom but an anti-cyclonic gyre at the intermediate depth. The simulated gyre circulation at the intermediate depth has been confirmed by the dynamic height calculation based on the Levitns hydrography data.The sandwich transports in the Luzon Strait are consistent with recent hydrographic, al observations.Model results suggest that the Kuroshio tends to form a loop current in the northeastern South China Sea. The simulated Kuroshio Loop Current is generated by the pressure head at the Pacific side of the Luzon Strait and is enhanced by theβ- plane effects. The β- plane appears to be of paramount importance to the South China Sea circulation and to the Luzon Strait translports. Without theβ-plane, the Luzon Strait transports would be greatly reduced and the South China Sea circulation would be complete-ly different.Yuan Dongliang1. Goddard Earth Science and Technology Center, University of Maryland, Baltimore County Code 971, Laboratory for Hydrospheric Processes, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA 2002Acta Oceanologica Sinica2002,21,2:37
2New development thoughts on the bio-inspired intelligence based control for unmanned combat aerial vehicle显示文摘Bio-inspired intelligence is in the spotlight in the field of international artificial intelligence,and unmanned combat aerial vehicle(UCAV),owing to its potential to perform dangerous,repetitive tasks in remote and hazardous,is very promising for the technological leadership of the nation and essential for improving the security of society.On the basis of introduction of bioinspired intelligence and UCAV,a series of new development thoughts on UCAV control are proposed,including artificial brain based high-level autonomous control for UCAV,swarm intelligence based cooperative control for multiple UCAVs,hy-brid swarm intelligence and Bayesian network based situation assessment under complicated combating environments, bio-inspired hardware based high-level autonomous control for UCAV,and meta-heuristic intelligence based heterogeneous cooperative control for multiple UCAVs and unmanned combat ground vehicles(UCGVs).The exact realization of the proposed new development thoughts can enhance the effectiveness of combat,while provide a series of novel breakthroughs for the intelligence,integration and advancement of future UCAV systems.DUAN HaiBin 1 ,SHAO Shan 2 ,SU BingWei 3 &ZHANG Lei 41 State Key Laboratory of Science and Technology on Holistic Flight Control,School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and Astronautics,Beijing 100191,China 2 Flight Control Department,Shenyang Aircraft Design and Research Institute,Shenyang 110035,China 3 Beijing Institute of Near Space Vehicle’s System Engineering,Beijing 100076,China 4Integration and Project Section,Air Force Equipment Academy,Beijing 100085,China 2010Science China(Technological Sciences)2010,53,8:32
3Aerodynamic/Stealthy/Structural Multidisciplinary Design Optimization of Unmanned Combat Air Vehicle显示文摘An optimization strategy is proposed to deal with the aerodynamic/stealthy/structural multidisciplinary design optimization(MDO) issue of unmanned combat air vehicle(UCAV).In applying the strategy,the MDO process is divided into two levels,i.e.system level optimization and subsystem level optimization.The system level optimization is to achieve optimized system objective(or multi-objective) through the adjustment of global external configuration design variables.The subsystem level optimization consists of the aerodynamic/stealthy integrated design and the structural optimization.The aerodynamic/stealthy integrated design aims at achieving the minimum aerodynamic drag coefficient under the constraint of stealthy requirement through the adjustment of local external configuration design variables.The structural optimization is to minimize the structural weight by adjusting the dimensions of structural components.A flowchart to implement this strategy is presented.The MDO for a flying-wing configuration of UCAV is employed to illustrate the detailed process of the optimization.The results indicate that the overall process of the surrogate-based two-level optimization strategy can be implemented automatically,and quite reasonable results are obtained.Hu Tianyuan,Yu Xiongqing Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China 2009Chinese Journal of Aeronautics2009,22,4:21
4全场观测技术概念、进程与展望显示文摘简要综述理想的流体力学观测手段的概念,近代全场观测技术(包括激光空间流动显示,定量化流动显示,全场测量技术等)及其应用发展的踪迹和趋向.同时介绍作者在此领域的若干研究工作.Shen Gongxin (Beijing University of Aeronautics and Astronautics,Dept.of Flight Vehicle Design and Applied Mechanics) 1997北京航空航天大学学报1997,23,3:17
5Unmanned air/ground vehicles heterogeneous cooperative techniques:Current status and prospects显示文摘Multiple unmanned air/ground vehicles heterogeneous cooperation is a novel and challenging filed.Heterogeneous cooperative techniques can widen the application fields of unmanned air or ground vehicles,and enhance the effectiveness of implementing detection,search and rescue tasks.This paper mainly focused on the key issues in multiple unmanned air/ground vehicles heterogeneous cooperation,including heterogeneous flocking,formation control,formation stability,network control,and actual applications.The main problems and future directions in this field were also analyzed in detail.These innovative technologies can significantly enhance the effectiveness of implementing complicated tasks,which definitely provide a series of novel breakthroughs for the intelligence,integration and advancement of future robot systems.DUAN HaiBin & LIU SenQi National Key Laboratory of Science and Technology on Holistic Flight Control,School of Automation Science and Electrical Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China 2010Science China(Technological Sciences)2010,53,5:16
6Three-Dimensional Heat Transfer Analysis for A Thermal Energy Storage Canister显示文摘High temperature latent thermal storage is one of the critical techniques for a solar dynamic power system. This paper presents results from heat transfer analysis of a phase change salt containment canister A three-dimensional analysis program is developed to model heat transfer in a PCM canister. Analysis include effects of asymmetric circumference heat flux, conduction in canister walls, liquid PCM and solid PCM, void volume change and void location, and conduction and radiation across PCM vapor void. The PCM phase change process is modeled using the enthalpy method and the simulation results are compared with those of other two- dimensional investigations. It’s shown that there are large difference with two-dimensional analysis, therefore the three-dimensional model is necessary for system design of high temperature latent thermal storage.Hou Xinbin, Xin Yuming, Yang Chunxin, Yuan Xiugan (Dept.of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronautics and Astronautics, Beijing, 100083.) Dong Keyong (Stirling Engine Research and Develop Center, Shanghai Marine Diesel 2001Journal of Thermal Science2001,10,1:9
7Design of multiple anti-windup loops for multiple activations显示文摘This paper considers anti-windup design for linear systems subject to actuator saturation.Three anti-windup gains are designed for activations immediately at the occurrence actuator saturation,after the saturation has reached a certain level and in anticipation of the occurrence of saturation,respectively.The design is based on the minimization of L 2 gain from the disturbance to the controlled output of the resulting closed-loop system.Traditional anti-windup scheme involves a single anti-windup loop for immediate activation.A recent innovation is to design a single anti-windup loop for delayed or anticipatory activation,as well as to design two anti-windup gains,one for immediate activation and one for delayed activation.Our design of three anti-windup gains for three different activations is shown through simulation to lead to significant further performance improvement over the previous activation schemes.WU XiongJun 1,2 & LIN Zongli 3,1 1 Department of Automation,Shanghai Jiao Tong University,and Key Laboratory of System Control and Information Processing,Ministry of Education of China,Shanghai 200240,China 2 No.802 Institute of Shanghai Academy of Space Flight Technology,the Eighth Academy of China Aerospace Science and Technology Corporation,Shanghai 200090,China 3 Charles L.Brown Department of Electrical and Computer Engineering,University of Virginia,P.O.Box 400743,Charlottesville,VA 22904-4743,USA 2012Science China(Information Sciences)2012,55,9:5
8ADS-B Data Authentication Based on ECC and X.509 Certificate显示文摘An automatic dependent surveillancebroadcast(ADS-B) system has serious security problems,and the data can be spoofed during broadcasting precise position information of aircraft.A solution of the ADS-B system data authentication based on the elliptic curve cipher(ECC) and X.509 certificate is proposed.It can avoid the key distribution problem by using the symmetric key algorithm and prevent the ADS-B data from being spoofed thoroughly.Experimental test results show that the solution is valid and appropriate in ADS-B universal access transceiver(UAT) mode.Wei-Jun Pan,Zi-Liang Feng,and Yang Wang the College of ComputerScience,Sichuan University,Chengdu 610065,Chinah the College of Aviation Management,the Civil Aviation Flight University of China,Guanghan 618307,China. 2012Journal of Electronic Science and Technology2012,10,1:4
9ANALYSIS OF SHEAR STRESS DISTRIBUTION IN HONEYCOMB AIRCRAFT WING STRUCTURE SUBJECTED TO (S.T.) TORQUE显示文摘ANALYSISOFSHEARSTRESSDISTRIBUTIONINHONEYCOMBAIRCRAFTWINGSTRUCTURESUBJECTEDTO(S.T.)TORQUEKhalidM.Tahir,ZhangXing(DepartmentofF...Khalid M. Tahir, Zhang Xing (Department of Flight Vehicle Design & Structural Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100083, China) 1997Chinese Journal of Aeronautics1997,10,3:4
10CONSTANT AMPLITUDE FATIGUE STRENGTH AND P-S_a-S_m-N CAMBER FAMILY显示文摘CONSTANTAMPLITUDEFATIGUESTRENGTHANDP-S_a-S_m-NCAMBERFAMILYNiKan(DepartmentofNavalArchitectureandOceanEngineering,ShanghaiJiaoT...Ni Kan(Department of Naval Architecture and Ocean Engineering,Shanghai Jiao Tong Universily, Shanghai, China, 200030)Gao Zentong(Department of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronautics and Astronautics,Beijing, China, 1996Chinese Journal of Aeronautics1996,9,1:3
11ANALYTICAL VARIATIONAL METHOD OF SOLUTION FOR STRESS CONCENTRATION FACTORS OF FINITE PLATES WITH A PIN HOLE显示文摘ANALYTICALVARIATIONALMETHODOFSOLUTIONFORSTRESSCONCENTRATIONFACTORSOFFINITEPLATESWITHAPINHOLEXiYuanshan;ZhangXing(Departmentof...Xi Yuanshan Zhang Xing(Department of Flight Vehicle Design and Applied Mechanics, Beijing University of Aeronautics and Astronautics, Beijing, Cina, 100083)Ren Bingyi Luo Anmin(Chendu Aircraft Industrial Corporation, Chendu, China, 610041) 1996Chinese Journal of Aeronautics1996,9,1:2
12An introduction to DNA microarrays for gene expression analysis显示文摘Karakach T K Flight R M Douglas S E 2010Chemometrics Intell Lab Syst2010,104,1:1
13coli 显示文摘Brown R Klaus D Todd E Effects of space flight clinorotation and centrifugation on the substrate utilization efficiency of E 2001Microgravity - Science and Technology2001,13,4:1
14Synaptic plasticity-Rise and shine (we are all morning people! ) 显示文摘Flight M H 2008Nat Rev Neurosci2008,,3:1
15Cereal grains and legumes in the preven-tion of coronary heart disease and stroke:a review of the liter-ature显示文摘Flight I Clifton P 0,,10:1
16Comparison of textilinin-1 with aprotinin as serine protease inhibitors and as antifibrino- lyric agents显示文摘Flight S Johnson L Trabi M et at 2005Pathophysiol Haemost Thromb02005,34,45:1
17Metformin in polycystic ovary syndrome:systematic review and meta-analysis显示文摘Lord JM Flight IH Norman RJ 2003SMJ2003,327,7421:1
18Kinase inhibitors:A winning combination against BCR-ABL显示文摘Flight M H 2010Nat Rev Drug Discov2010,9,3:1
19Texrilinin-I ,an alternative an- ti-bleeding agent to aprotinin: Importance of plasmin inhibition in controlling blood loss显示文摘Flight S Johnson L l)u Q 2009British Journal of Haematology2009,145,2:1
20Cereal grains and legumes in the prevention of coronary heart disease and stroke: a review of the !literature显示文摘FLIGHT I CLIFTON P 2006European Journal of Clinical Nutrition2006,60,10:1
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