简介：

简介：BasedonEvans’spatialsmoothingpreprocessingscheme,anewapproachcalledtwo-directionspatialsmoothingpreprocessingmethodispresented.Itisprovedthatthedecorre-lation,theeffectiveapertureandthemaximumnumberofdistinguishablecoherentsignals(whenarraysizeisgiven)ofthenewmethodarebetterthanthoseoftheEvans’method.Simulationresultsgiveacomparisonbetweentheeigenvectorspectrumsproducedbythetwomethods.

简介：在这份报纸，我们为algebroid功能w(z)证明那，单个方向argz=0，令人满意那为任意并且任何给定的抓住与至多可能的2v非凡的价值一，是w(z)的Nevanlinna方向。

简介：你的方位感是否很强？当你寻找一个地方却找不到时，是询问当地人，警察还是借助于地图呢？看来，在平时学习一些必要的表示方位或方向的日常用语是非常必要的。

简介：很多人会说失败是成功之母。但真正面对失败时．却很少有人会想起这句话。同样．人们也常会承认理想的重要性．而现实生活中却常是目标常常因地因时而有所转变。

简介：AfterdescribingthegeneralsituationofChinaSouthernPowerGrid(CSG),thisarticleexpoundsthenecessityforCSGtocarryouttheprogramofsmartgrid,andpointsoutthefavorableconditionsandthekeyfieldstodevelopsmartgrid.Italsoputsforwardnear-termemphases,andgivesrelevantsuggestions.

简介：Themainpurposeofthispaperistoprovidearestartingdirectionforimprovingonthestandardconjugategradientmethod.Ifadrasticnon-quadraticbehaviouroftheobjectivefunctionisobservedintheneighbourofxk,thenarestartshouldbedone.Thescalingsymmetricrank-oneupdatewithDavidon’soptimalcriterionisappliedtogeneratetherestartingdirection.Itisprovedthattheconjugategradientmethodwiththisstrategyretainsthequadratictermination.Numericalexperimentsshowthatitissuccessful.

简介：Inthispaper,alowcomplexityESPRITalgorithmbasedonpowermethodandOrthogo-nal-triangular(QR)decompositionispresentedfordirectionfinding,whichdoesnotrequireaprioriknowledgeofsourcenumberandthepredeterminedthreshold(separatesthesignalandnoiseei-gen-values).Firstly,accordingtotheestimationofnoisesubspaceobtainedbythepowermethod,anovelsourcenumberdetectionmethodwithouteigen-decompositionisproposedbasedonQRde-composition.Furthermore,theeigenvectorsofsignalsubspacecanbedeterminedaccordingtoQmatrixandthenthedirectionsofsignalscouldbecomputedbytheESPRITalgorithm.Todeterminethesourcenumberandsubspace,thecomputationcomplexityoftheproposedalgorithmisapproximatedas(2log_2n+2.67)M~3,wherenisthepowerofcovariancematrixandMisthenumberofarrayele-ments.ComparedwiththeSingleVectorDecomposition(SVD)basedalgorithm,ithasasubstantialcomputationalsavingwiththeapproximationperformance.Thesimulationresultsdemonstrateitseffectivenessandrobustness.

简介：

简介：Inthispaper,thesubspacefittingmodelsfordirection-of-arrival(DOA)estimationisanalyzed,aneffectivealgorithmicapproachisgiven.Astheinitializationvalueissocriticaltotheglobalconvergence,thecontinuationtheoryisalsousedtodevelopanewframeworkwhichsolvestheinitializationproblempowerfully.Somenumericalevidencewillbegiventoshowthattheperformanceofthenewalgorithmisverypromising.

简介：方向关系是一种重要空间关系。因为空间目标的变化尺寸和嵌入的空格的不同规模，为方向关系的描述和代表有详细的不同层次。基于adirection-关系矩阵，划分有序的方向关系的空间方向关系并且彻底地的层次框架被造。内部方向关系被用来完善方向关系的表示，二进制编码的想法有创作力地被使用构造由一个一致矩阵描述多重内部方向关系的一个内部详细矩阵。模型为方向关系把拓扑的信息集成到描述模型，它将打空间综合推理的基础。

简介：Sincetheexcessivecapacityinsteelmakingandcontinuouscastingatpresent,andthelimiteddevelopmentmarginofCCtechnologyandequipmentinscale,thefurtherdevelopmentmustbemadeinaprofoundanddetailizedway.ThispaperenumeratestheitemsofCCtechnologyandequipment,whichneedtobedetailizedfromseveralaspectssuchasrollarrangementdesign,equipmentdesignandproductionoperation,anditpointsoutthatdetailizationisthefuturedirectionofCCtechnologyandequipment.Theitemsinrollarrangementdesignincludeeliminatingperiodicmeniscusfluctuationbyadjustingspacebetweenrollsreasonably;takingspecialmeasurestoavoiddangerousregionsofcastingspeed,inordertoreducethecenterporosityandcenterlinecrackofslab;optimizingthemajorradiusandthelengthofouterarcofcasterbeforestraighteningpointtoavoiddangerousregionofcastingspeed.Theitemsinequipmentdesignincludechoosingasuitablestructureofsupportandguidingrollaccordingtotheconcreteconditionsofcaster;accordingtobulgingshapeofslab,thinkingmoreaboutrestrictionofshelltobulgingforce,discussingtheforceonrollers,optimizingsplitrolltosupportslab;safetyfactorshouldbeconsideredtogetherwithcalculationmethodofthebearingnominalstaticload.Theitemsinaspectsofcontinuouscastingoperationincludethedelicacydivisionandthefunction-positioningofoperationmodesforCCmachineduetotheconsiderationofdynamicsoftreduction;monitoringandcontrollingsystemofCCmachinemustbefurtherdetailizedtoimprovethestabilityofproductionoperationandslabquality.Inadditiontothethreeaspectsmentionedabove,thisarticlepointsoutmanyotheritemsalso,suchashomogenizationofsecondarycoolingofslab,qualitycontrolofsurfaceandinternalofslab,andsoon.Thisarticleemphasizes,somekeytechnologiesneedtoberesearchedalso,andalltheseresearcheswillneverstop.

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简介：Directionisacommonspatialconceptthatisusedinourdailylife.Itisfrequentlyusedasaselectionconditioninspatialqueries.Asaresult,itisimportantforspatialdatabasestoprovideamechanismformodelingandprocessingdirectionqueriesandreasoning.Dependingonthedirectionrelationmatrix,aninverteddirectionrelationmatrixandtheconceptofdirectionpre-dominanceareproposedtoimprovethedetectionofdirectionrelationbetweenobjects.Directionpredicatesofspatialsystemsarealsoextended.Thesetechniquescanimprovetheveracityofdirectionqueriesandreasoning.Experimentsshowexcellentefficiencyandperformanceinviewofdirectionqueries.

简介：Apracticalmethodforcomputingtheone-wayrectangularorthotropicplate(isotropicplateasaspecialcase)issuggestedinthispaper.Thesupportedcondi-tionsintwooppositeedgesmaybesimplysupported,continuousorsupportednonsymmetricallyandtheothertwooppositeedgesareslide-supportedorfree.Aseriesofsimplifiedformulasaregivenforcalculatingthebendingmomentsalongthecrosssection(loadedsection),inwhichtheactingpointoftheconcentratedloadorthecenterofarec-tangularuniformloadislocated.Thevalidrangeandaccuracyoftheseformulaswerestud-iedandtheapproximateresultswereexaminedandcomparedextensivelywiththosebythetriangularseriessolutionorfiniteelementmethod.

简介：

简介：Theproblemconsideredinthispaperistointerpolateavirtualuniformarrayfromarealtwo-dimensionalarraywitharbitrarygeometryviaaninterpolationmatrix.Thekeytothisproblemishowtoarrangethesevirtualsensors.Itisshownthatthevirtualuniformlineararrayshouldhavethesamemain-lobebeam-patternastherealarrayoveranangularsectorofinterest.Simulationresultsarepresentedtoillustratetheapplicationofvirtualarrayindirectionfinding.

简介：在q差别操作员下面的全部功能的生长在这份报纸被学习，然后朱莉娅的一些性质在q差别操作员被获得的更高的目下面全部功能设定。

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简介：Theattitudecontrolsystemdesignanditscontroleffectareaffectedconsiderablybythemass-propertyparametersofthespacecraft.Inthemissionofon-orbitservicing,asfuelisexpended,orthepayloadsareaddedorremoved,thecenterofmasswillbechangedincertainaxe;consequently,somethrusters’directionsaredeviatedfromthecenterofmass(CM)incertainplane.TheCMofassembledspacecraftestimationandthrusterdirectioncontrolarestudied.Firstly,theattitudedynamicsoftheassembledspacecraftisestablishedbasedontheNewton-Eulermethod.Secondly,theestimationcanbeidentifiedbytheleastrecursivesquaresalgorithm.Then,aschemetocontrolthethrusters’directionsisproposed.Byusingthegimbalinstalledattheendoftheboom,theangleofthethrusteriscontrolledbydrivingthegimbal;therefore,thrusterscanbedirectedtotheCMagain.Finally,numericalsimulationsareusedtoverifythisscheme.Resultsofthenumericalsimulationsclearlyshowthatthiscontrolschemeisrationalandfeasible.