简介：Inthispaper,thescrewtransformationsarediscussedindetailandtheirmatricesaregiven.BasedonLagrangianequations,anewmethodformodellingthedy-namicbehaviorofrobotsispresented.Thederivationissimple,andtheconfigurationofthemodelisconcise.Allthecoefficientsarecalculatedinsimplerecursiveway,whichcanbeeasilyprogrammedincomputation.Themethodpresentedcanalsobeusedinthedy-namicandthekinematicstudyofspatialmechanisms.

简介：本文提出一种新的盲均衡和通道辨识方法．该方法基于过采样技术和独立分量分析神经网络进行信道均衡，利用均衡输出序列和高阶累积量，辨识信道参数．与通常的方法相比，该方法网络结构简单，不必利用训练序列．计算机仿真结果表明算法的良好性能

简介：Order-recursiveleast-squares(ORLS)algorithmsareappliedtotheprob-lemsofestimationandidentificationofFIRorARMAsystemparameterswhereafixedsetofinputsignalsamplesisavailableandthedesiredorderoftheunderlyingmodelisunknown.Onthebasisofseveraluniversalformulaeforupdatingnonsymmetricprojec-tionoperators,thispaperpresentsthreekindsofLSalgorithms,callednonsymmetric,symmetricandsquarerootnormalizedfastORLSalgorithms,respectively.Astotheau-thors’knowledge,thefirstandthethirdhavenotbeensofarprovided,andthesecondisoneofthosewhichhavethelowestcomputationalrequirement.Severalsimplifiedversionsofthealgorithmsarealsoconsidered.

简介：Basedonwide-neighbourhood,weinthispaperproduceaprodictor-correctoralgorithmforlinearprogramming,whichpossesseonepredictorstepandtwocorrectorsteps.ItsiterationcomplixityboundisO(n2/3L).OuralgorithmimproveontheiterationcomplexityofO(n3/4L)ofthepredictor-correctoralgorithmproposedbyY.ZhangandD.Zhang.

简介：Atwo-stagedelectronicballastwithwidedimmingrange,highpowerfactor(PF)andlowelectromagneticinterference(EMI)ispresented.Itchangestheinputvoltageofthestageofpowerinverterfordimmingcontrol,soitovercomessomelimitationsoftraditionalelectronicballaststhatusefrequencyvariation.Atthesametime,thestageofpowerinverterrunsunderthesoft-switchingatthefixedswitchingfrequencyandreducesEMIgreatly.Itsprincipleandcharacteristicareanalyzedindetail,andexperimentalandsimulatedresultsareobtainedona40Wfluorescentlamp.

简介：Gainingathoroughunderstandingofthetheoreticalprinciplesofrockbreakingwithadisccutterisacriticalissueintunnelboringmachine(TBM)technology.Tofullyconsiderthecomplexityandimportanceofthebasicprinciplesofrockbreakingduringtunnelexcavation,inthispaperweuseanewmethod,thesmoothparticlehydrodynamics(SPH),tostudytherock-breakingmechanismandverifyitsaccuracyandfeasibility.UsingtheSPHmethod,weinducetherockfragmentationprocesswithtwocuttersinsynchronousandsequentialorders.Theresultsshowthatwhenthecuttersactonrocksequentially,thesecondindentationinfluencesthecrackevolutionofthefirstindentation.Withincreasedcutterspacing,thesecondcrackgraduallybecomesindependentofthefirstcrack.Undersynchronousactionofthetwocutters,abursiformnucleusisgeneratedbeneaththecuttersandtheareaofthenucleusincreaseswithincreasedcutterspacing.Whetherthecuttersactontherocksequentiallyorsynchronously,wefoundtheoptimumcutterspacingofourchosenrocktypetobe60mm.Ouranalysesresultsshowthattheefficiencyofsequentialrockcuttingissuperiortosynchronouscutting,bothwithrespecttocrackevolutionandcutterforce.

简介：太平洋西南部有一个由南、北两岛及诸小岛组成的国家，称为新西兰，首都惠灵顿是地球上最靠南的都城，西隔塔斯曼海与澳大利亚相望。全国面积270534平方公里，与英国差不多大，全境多山，山地和丘陵占总面积75％以上。