简介：这份报纸通过一个边界控制器为一个维的线性退化波浪方程被奉献给空可控制性问题的研究。首先，线性退化波浪方程的well-posedness被讨论。然后，一些退化波浪方程的空可控制性被建立，当控制对非退化的边界起作用时。与在控制在退化边界上扮演的情况中的已知的可控制性结果不同，在州的空格的任何起始的值在这种情况中是可控制的。另外，在可控制性时间的明确的表情被给。而且，可控制性上的一个反例为一些另外的退化波浪方程被给。

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简介：Theestimationofclutterpolarizationissignificantinvirtualpolarizationfiltering.ThispaperproposesvariablestepsizeLeastMeanSquareerror(LMS)algorithmtoestimateclutterpo-larization.Theadaptiverecursivefunctionissetupbasedondoublepolarizationreceivingsignalmodel.Bychoosingdesiredresponsesignalproperly,thereceiveddataareestimated.TheresultofestimationisusedforNullPhase-ShiftinstantaneousPolarizationFilter(NPSPF)designandtarget’samplitudeandphasecompensation.Algorithm’strackingperformanceisdiscussedindetail.Thesimulationresultsareconsistentwiththeaboveanalysis,andthecluttersuppressioniseffective.

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简介：<正>Immunologicaltolerancetoselfisessentialformaintainingtheintegrityoftheorgansystems,anditsbreakdownmayleadtothedevelopmentofautoimmunediseases.Tolerancetoselfismaintainedthroughseveralmechanisms,whichincludenegativeselection,functionalinactivation(anergy)andsuppressionofautoreactivelymphocytes.However,onlynegativeselectionpermanentlyremovesautoreactivecellsthroughapoptosis.WhileithaslongbeenknownthatnegativeselectionrequiresaTcellreceptor(TCR)signal,itisunclearwhetheradeathligandsignalisalsoinvolved.TRAIL,thetumornecrosisfactor(TNF)-relatedapoptosis-inducingligand,isanewlydescribedmemberoftheTNFfamily.Unlikeotherdeathligandsof

简介：Thispaperpresentsatrustregionalgorithmwithnullspacetechniquefornonlinearequalityconstrainedoptimization.Consideringinthenullspacemethodsthat,theconvergentrateofrangespacestepisfasterthanthenullspacestepforthemostcases,theproposedalgorithmcomputesnullstepsmoreoftenthanrangespacestep.Moreover,thenewalgorithmisbasedonthereducedHessianSQPmethod.Globalconvergenceoftheproposedalgorithmisproved.Theeffectivenessofthemethodisdemonstratedbysomenumericalexamples.

简介：Inthisarticle,byusingtheoryoflinearevolutionsystemandSchauderfixedpointtheorem,weestablishasufficientresultofexactnullcontrollabilityforanonautonomousfunctionalevolutionsystemwithnonlocalconditions.Inparticular,thecompactnesscondi-tionorLipschitzconditionforthefunctionginthenonlocalconditionsappearinginvariousliteraturesisnotrequiredhere.Anexampleisalsoprovidedtoshowanapplicationoftheobtainedresult.

简介：DearEditor,Iamcoauthorofthepaperentitled'Balancecontrolofahumanoidrobotbasedonthereactionnullspacemethod'byAkinoriNishio,KentaroTakahashiandDragomirN.Nenchev,publishedonpages1996-2001

简介：[摘要] Earth Null School是一个能在线生成实时动态气象数据的网站，主要展示大气、洋流、污染物和温度等等气象信息。本文尝试性地将地理课堂教学与在线动态气象数据融合起来，用更为直观、更为严谨的教学手段来突破课程重难点，从而达到教学目标的要求，进一步落实地理学科核心素养。

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简介：为一个真实珍视的函数，f在有限间隔上定义我我们从形式行(y)=的微分操作符的空空格考虑接近的f的问题?k=0naky(k)L_n(\psi)=\sum\limits_{k=0}^n{a_k\psi^{(k)}}，在此经常的系数kR可以被使适应f。

简介：Anewexist-nullcombinedmodelisproposedforthestructuraltopologyoptimization.Themodelisappliedtothetopologyoptimizationofthetrusswithstressconstraints.Satisfactorycomputationalresultcanbeobtainedwithmorerapidandmorestableconvergenceascomparedwiththecross-sectionaloptimization.Thisworkalsoshowsthatthepresenceofindependentandcontinuoustopologicalvariablemotivatestheresearchofstructuraltopologyoptimization.

简介：作者为二个向后的随机的热方程联合的一些系统建立空可控制性。需要的可控制性结果借助于为控制系统的双系统证明合适的observability估计被获得。

简介：CognitiveRadio(CR)isapromisingtechniqueforthenextgenerationmobilecommuni-cationsystemforitscapabilitytosolvetheconflictsbetweenthescarcityandunderutilizationofspectrum.Inthispaper,aimingatmaximizingthesystemcapacityofamulti-antennaCRsystemonthepremisethatavoidinterferencetotheprimarysysteminthesamebandsimultaneously,aresourceallocationmethodwhichisabletoavoidinterferencebetweenPRimary(PR)andCRusersbypro-jectingthetransmitsignalsofCRusersonthenullspaceofthePRusers'channelsisproposed.CRuserswithbetterchannelconditionareselected,andtheinterferencefromCRsystemtoPRuserscanberemovedcompletelybyprojectingthetransmitsignalsofCRsystemonthenull-spaceofPRusers'channels.Parallelsub-channelsareconstructedforCRusersthroughSingularValueDecomposition(SVD).Atlast,waterfillingisalsoadoptedtoincreasetheCRusers'capacity.Simulationresultdemonstratesthatcomparedwithexistingmethods,ourmethodcanimprovetheachievablesumrateofCRusersaswellasreducetheoutageprobabilityofPRusers.

简介：Weobtaintheexpressionsforsectionalcurvature,holomorphicsectionalcurvatureandholomorphicbisectionalcurvatureofaGCR-lightlikesubmanifoldofanindefinitenearlyKhlermanifoldandobtaincharacterizationtheoremsforholomorphicsectionalandholomorphicbisectionalcurvature.WealsoestablishaconditionforaGCR-lightlikesubmanifoldofanindefinitecomplexspaceformtobeanullholomorphicallyflat.

简介：目的探讨CD4+CD28null细胞及氧化应激标志物丙二醛(malondialdehyde,MDA)和超氧化物歧化酶(superoxidedismutase,SOD)与多囊卵巢综合征(polycysticovarysyndrome,PCOS)发病机制的关系。方法选择32例PCOS患者(PCOS组)和28例健康女性(对照组)。分别抽取两组外周静脉血6ml,其中3ml分离并留取血清,检测各标本血清中性激素水平和C反应蛋白(CRP)、SOD和MDA的水平;另3ml离心分离外周血单个核细胞(PBMCs),流式细胞术检测CD4^+CD28^nullT细胞亚群。比较PCOS组与对照组各检测指标特点。结果PCOS组外周血中CD4^+CD28^nullT细胞显著高于对照组(P<0.05);PCOS组血清中CRP和MDA均显著高于对照组,而SOD则显著低于对照组(P<0.05);相关性分析显示,PCOS组CD4^+CD28^nullT细胞的表达与CRP和MDA间存在正相关(P<0.05),与SOD之间存在负相关(P<0.05)。结论PCOS患者体内存在以CD4^+CD28^nullT细胞表达异常增加为代表的免疫调节机制紊乱和氧化应激平衡失调,深入探讨这两种病理生理模式与PCOS的关系可能有助于阐明其发病机制。