简介：Inthispaper,ahybridadaptivecompensationcontrolschemeisproposedtocompensatethefrictionoccurrenceandothernonlineardisturbancefactorsthatexistinthehigh-precisionservosystem.Anadaptivecompensationcontrollerwithadual-observerstructureisdesigned,whiletheLuGredynamicfrictionmodelwithnon-uniformparametricuncertaintiescharacterizesthefrictiontorque.Consideringtheinfluenceoftheperiodicdisturbancetorqueandparametricuncertainties,fuzzysystemsandarobusttermareemployed.Inthisway,thewholesystemcanbetreatedasasimplelinearmodelafterbeingcompensated,thentheproportional-derivative(PD)controllawisappliedtoenhancingthecontrolperformance.OnthebasisofLyapunovstabilitytheory,theglobalstabilityandtheasymptoticconvergenceofthetrackingerrorareproved.Numericalsimulationsdemonstratethattheproposedschemehaspotentialstorestraintheimpactofdisturbanceandimprovingthetrackingperfor

简介：Sinceancienttimes,asoneofthesymbolsofuglyanddirty,prostitutesareinvariablylivingintheblackmarginsofsociety.Facingprostitutes’miseries,peoplealwayscannotunderstandtheiremotions,mentalitiesanddesires,ortreatsthemasequals,particularlyaswomen.ProstitutesareaspecialgroupintheoppressedwomeninWesternsocieties.MargaretandNanaaretwotypicalimagesoftheminthehistoryofwesternliterature.Withtearsandlives,theydeducetheirmiserablelifestoriessimilarly.

简介：正如读者看到的那样，这一期我们的封面是关于汽车4S店的变局。我们的结论很直接简单：4S店的4个＂S＂会被拆散，会少一个S或者少二个S。为什么呢？随着城市土地价格上涨，4S店占地面积会变得越来越小，老板们开不起综合性的4S店，就会想着瘦身，不可能再单独包含着“维修功能”，于是，一个“S”就出局了，接着，另外一个S，也出局了。我们喜欢小S，但我们会拆散“4S”。

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简介：TheU.S.-drivenTPPhascaughttheattentionoftheregionandisbringinguncertaintytoEastAsianeconomicintegration.China,theU.S.andJapanhavetakendifferentpositionsontheTPPitself.TheU.S.isactivelyparticipatinginTPPnegotiationsandtryingtodominateit.JapanregardstheTPPasatoolwithwhichitcanfurtherexploremarketsaswellasstrengthenitsrelationshipwiththeU.S..ChinaiscurrentlyassessingtheU.S.shiftineconomicstrategytowardsEastAsiaandthepotentialimpactsofTPPexpansion.

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简介：同学们，欢迎大家踊跃参加“全国中学生英语翻译大赛”!请将下面这篇文章翻译成汉语。（具体参赛事宜请参见本刊2013年第7期中的《2013年全国中学生英语翻译大赛启事》）

简介：简妮的寒假过得充实而快乐，一起来瞧瞧假期中她都做了什么呢？通过看图片来试着解开文字谜，并完成这段话。

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简介：OnJuly15,2008,TsinghuaUniversityreceivedintoitscollectionabatchofWarringStatesBambooslipsdatingtoaround300BCEthathadbeenpreviouslysmuggledoutofChina.Knownasthe‘TsinghuaBambooSlips’清華簡(TBS),theyformagroupofbamboomanuscriptswithtraditionalChinesetexts,categorizedas‘Classics’Jīng(經)and‘Histories’Shǐ(史),suchastheShangshu尚書(‘ClassicofDocuments’),theShijing詩經(‘ClassicofSongs’)andtheYijing易經(‘ClassicofChanges’).Themajorityofthemanuscriptsalsocontaintextspreviouslyunknownformorethantwothousandyears,andtheyare,therefore,trulyprecioushistoricalartifactsofthehighestscholarlyvalue.

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简介：TheU.S.'newly-reinforcedAsia-Pacificalliancehasturnedouttobeanimportantfactorinfluencingtheregionallandscapeandbigpowerrelations.Historically,theclosepoliticalandmilitarycooperationbetweentheU.S.anditsallieswasoneofthefactorsthathelpeditwintheColdWar.AftertheendoftheColdWar

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简介：今天就是母亲节啦！两天前，我偷偷做了一张大大的母亲节贺卡，在卡片上画了很多很多颗红心，代表我对妈妈的爱。

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