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1.
Design of vision-based soccer robot using DSP   总被引:1,自引:0,他引:1  
0 INTRODUCTIONAvision basedsoccerrobotsystemconsistsoffoursubsystems ,whicharerobotsubsystem ,communicationsubsystem ,visionsubsystemanddecision makingsub system .Visionsubsystemprovidesthepositioninforma tionofeveryrobotandtheballtodecision makingsub syste…  相似文献   

2.
Faultstructure ,oftenmadeupofmanyfaultsofdi fferentscales ,issignatureofthecourse ,stateandinten sityofrockfracturing .Becauseofheterogeneityofphysi calbehaviorofrockanddifferenceoftectonicaction ,faultsystemoftenappearsdisorderedandunsystematiconthesurfac…  相似文献   

3.
Cyclopropylamineisanimportantintermediateforsynthesisofantibioticmedicinessuchasciprofloxacin,profloxacin,sparfloxacin,etc.,andisusedtopreparefinechemicals.Thoughsomeresearchersstudiedthesynthesisofcyclopropylamine,thismethodisnotsuitableforlargescalepr…  相似文献   

4.
0 INTRODUCTIONUsuallythesystem’sactuatorscontainthedeadzonenonlinearityinphysicalsystems ,whichdeterioratestheperformanceofthesystem .Thedeadzonearegenerallyduetofriction ,whichcanvarywithtemperatureandwear .Also ,thenonlinearitymayappearinmass producedcom…  相似文献   

5.
SCGM(1,m)_c model with time-lag and its application in deformation analysis   总被引:1,自引:0,他引:1  
ThecriticalproblemsinGreysystemsaremodelingandprediction .Throughgenerationtran sitionandcorrelationanalysistechniques,greysystemtheoryproposedin 1 982becomesanusefultoolforinvestigatingevolutionmechanismsandde velopingpredictionmodelsforthatkindofsys tems…  相似文献   

6.
Biocompatibilityassessmentofimplantmate rialsisbasedoninvitroandinvivoapproach es[1,2 ] .Dissolutionanddegradationofimplantmaterialsinbodyfluidsmayleadtolocalinflam mation ,systemtoxicity ,orallergicreaction .Itisimportantthereforetoevaluatethetoxi cityofthei…  相似文献   

7.
0 INTRODUCTIONTheexecutionofaproductionsystemisknownastheMRAcycleandisexecutedbytheinferenceengine .TheMRAcycleconsistsofthreephases :match ,resolve ,andact.Accordingly ,theresearcheffortstoimprovetheper formanceofproductionsystemscanbedividedintothreecate…  相似文献   

8.
Openlogic,developedbyLi[1],isaformalsystemformodelingthegrowingandupdatingofknowledgeandthedynamicsofformaltheories.Italsoservesasalogicalfoundationforknowledgebasemaintenanceandsoftwareevolution.Reconstructionandcognitiveprocessarethetwobasicconceptsin…  相似文献   

9.
0 INTRODUCTIONThesatelliteattitudecontrolsystemisakeysubsystemforasatellite,andwheneverthereisafailureintheattitudecontrolsystem,itmaycausethedeteriorationorfailureofthesatellitefunctions.Itisthereforeveryimportanttostudythediagnosisoffailuresinthesate…  相似文献   

10.
Expertsystemhasabroadapplicationinpowersystem ,suchasexpertsystemsusedmostlyinforfaultdiagnosisandrestorativeopera tion[1,2 ] .IntheDuisburgUniversityofGermany ,thetraining,simulationandrestorationexpertsys temforpowergridhasbeenrealized ,andithascertainlyob…  相似文献   

11.
Phase diagram and thermodynamic properties of Ag-Cu alloys   总被引:14,自引:0,他引:14  
Normally,thealloyphasediagramisthegeometricaldescriptionoftherelationsbetweenphases,compositionsandtemperatureundernormalpressure.Thetechnologyofcalculatingphasediagramsisbasedonthermodynamicsofalloys,whichstudiestherelationsbetweenvariousenergyfactors…  相似文献   

12.
Atomic volumes and volume functions for Ag-Cu alloys   总被引:8,自引:0,他引:8  
Thetaskofalloydesignistoproducealloyswithexpectedpropertiesbychoosingelementsandtheirappropriateproportionsandadoptingreasonableworkingline,orinversely,topredictpropertiesofalloysaccordingtotheelements,theirproportionsandstructures.Thesetwoinverseproce…  相似文献   

13.
Electronic structure of Ag-Cu alloys   总被引:15,自引:0,他引:15  
Inordertoadvancematerialsscienceintoasystematicscienceofmaterialsandempiricaldesignofmaterialsintoascientificdesignofmaterials,wefirstestablishedtheoneatomtheoryofpuremetals(simplyOAtheory)[1—6]andthendevelopedthecentralatomsmodelinthestatisticthermodyn…  相似文献   

14.
根据混合自由能有最小值,过剩自由能有最大值(或最小值),激冷条件下产生化合物状亚稳相及共晶,分层等现象,针对Cd-Bi,Ge-Al,Bi-Sn,Cd-Sn,Ag-Cu,Al-Ga;Si-Ag,Pb-Sn和Al-Sn金属熔体推导了作用浓度的计算模型,计算结果与实测值符合较好,从而证明所提出的计算模型符合本类熔体的结构特点。  相似文献   

15.
计算合金热力学性质的Miedema理论   总被引:1,自引:0,他引:1  
分析了Miedema理论,在二元合金热力学性质计算时,用Miedema理论结合几何模型的方法,能为生产实验提供理论依据。对于多元合金体系热力学性质的计算,由二元系溶体的热力学性质推算多元合金体系热力学性质的溶体模型,并介绍了由Toop模型和周模型外推得到的Miedema模型。但对于多元合金体系,其理论值与实验值并不如二元合金体系符合得那样好,为了能精确地计算三元以及多元合金体系的热力学性质,还需要对几何模型作进一步完善.  相似文献   

16.
钛合金因具有高强度、低密度、耐腐蚀等优良性能而广泛应用于航空航天领域,因此从理论上研究钛合金组织演变规律对新型钛合金的定量设计十分必要。利用余氏理论计算价电子结构参数,结合元胞自动机规则,建立了Ti?2Nb合金β相组织模拟方法,对Ti?2Nb合金在1 000、1 050、1 100、1 150、1 200 ℃固溶时的微观组织进行了模拟。结果表明,该模型能够将相结构单元与β相组织形核长大建立关联;β相组织形核点数量与固溶温度的定量关系式可以通过余氏理论计算的相结构单元结合能进行表征;β相组织的晶粒尺寸随固溶时间的演变可以通过模拟步长建立关联。研究结果可为合金成分、制备工艺、组织、性能定量关系的建立提供可借鉴的思路。  相似文献   

17.
采用逻辑变量表达热力系统和回热加热器的结构特征 ,以矩阵理论为基础 ,对回热加热器物质平衡和能量平衡关系进行推导 ,建立了火电厂热力系统并联算法通用逻辑 -矩阵模型 .该模型全面考虑了回热加热器换热效率以及各种辅助汽水等因素对热力系统计算的影响  相似文献   

18.
研究了刚性圆锥头弹体贯穿延性金属靶板的冲击力学特性,将侵彻过程分为3个阶段,利用圆柱形空腔膨胀理论建立了侵彻方程,得到了各阶段弹体的过载和能耗的表达式.对4种不同厚度的铝合金靶板的锥形钢弹贯穿试验算例进行了理论和仿真计算,对所得结果与试验数据作了对比,结果显示三者一致性较好.分析了弹体在不同阶段的过载特性和影响因素,为尖形弹体及小型装药的侵彻过载特性评估提供了理论参考和分析方法.  相似文献   

19.
采用正电子湮没寿命谱方法研究BaF2晶体质子辐照效应.研究能量为1.5MeV和2.0MeV质子辐照BaF2晶体的正电子湮没寿命谱,比较两种情况下受照晶体的辐照损伤.正电子湮没寿命谱说明BaF2晶体质子辐照的电离效应显著,由于电离会使晶体中少量金属离子产生变价效应,引起位移损伤.1.5MeV能量的质子辐照比2.0MeV能量的质子辐照产生的位移损伤大.  相似文献   

20.
Based on the dislocation theory and Olson's stacking fault model, a model describing the nucleation of an hcp(ε) martensite embryo at low-angle grain boundary is proposed with the influence of external stress field taken into account. The dependences of temperature (T), shear stress (τ) and dislocation density at grain boundary on the martensite nucleation in FeMnSi based alloy, as an example, are numerically simulated. It has been shown that there exist the subcritical and critical embryos during the course of ε-phase nucleation. The free energy difference between them is just the energy barrier of embryo growth. Depending on T and τ, the characteristic embryo sizes may vary in wide ranges and decrease with increasing a and decreasing T. The energy condition of martensitic transformation at Ms and critical shear stress (τc) is discussed from the viewpoint of kinetics and thus the TEM observed result that stacking fault energy is not zero at Ms temperature is reasonably explained. Besides, it is pr  相似文献   

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