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IntroductionPneumaticcylindersareeconomic,convenientandcanbedrivenathighspeed;therefore,theyarewidelyusedinmachinery.However,theiraccelerationanddecelerationcharacteristicsarefarinferiortohydraulicandelectricactuatorsduetotheaircompressibility.Improvedi… 相似文献
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IntroductionLinearminimumvariancedstepaheadpredictorsaremostlypopularinmanyfieldsofapplication,suchasprocesscontrolprediction,adaptivecontrol,andeconomicprediction[1,2].Thispaperdiscussesthepracticeofcomputingcurrentpredictorformsandpresentsasetofrecursi… 相似文献
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Tang Wei Wang Qijun College of Physical Education Southwest China Normal University Chongqing Southwest Agricultural University Chongqing 《西南师范大学学报(自然科学版)》1999,(5)
PrefaceAgaricusblazeiMurrillbelongstoAgaricalesAgaricaceacAgaricalesandisakindofbothedibleandmedicinalfungiandcontainsrichbiologicalactivitycomponents[1,2].Atpresent,notmuchresearchwasfocusedonitsimmunologicalactivityabroad.Wehavenotfoundreportsofsuc… 相似文献
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Introduction Towanttochangeisthebasiccharacterofhumanbeings.Colorchangesreflectamyriadofelementsfromdesignandsomecharacteristicssuchasfineart,aswellaseconomics,politics ,tra ditionalcultureandpsychologicalmoods.Inordertokeepupwiththechangingcolorandmak… 相似文献
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Quantum Efficiency of Fluorescent Dyes and Color Matching 总被引:2,自引:0,他引:2
IntroductionThetextilecoloristsusefluorescentdyestoachievecertainspecialeffects ,whichcouldnototherwisebeobtained .Sincefluo rescentdyeshavetheuniqueopticalpropertiesdifferentfromcon ventionaldyesandagents,thevariousdifficultiesareencounteredmainlyinflu… 相似文献
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IntroductionLanthanide (Ln3 )can promotethegrowthofcropsandincreasetheirproduction .However ,Ln3 canalsoaffectanimaltissuesandhassometoxicfunctionsatcertainconcentrations[1] .ThemechanismbywhichLn3 exertsbiologicaleffectsremainsunclear.StudiesshowthatLn3 cani… 相似文献
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Numerical Simulation of Gas-particle Flows with Different Swirl Numbers in a Swirl Burner 总被引:1,自引:0,他引:1
IntroductionSwirlburnersarewidelyusedinpulverizedcoalfiredboilerfurnaces.Toachievehighefficiencyandlowpollutioncombustion,numericalsimulationisneededtopredictthesizeoftherecirculationzone,theintensityoftherecirculatingflows,theparticlegasmixingandthere… 相似文献
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IntroductionWiththedevelopmentofpowersystem ,thepredictablefaultcurrentisincreasingquickly .Insomecases ,thefaultcurrentcouldexceedeventheratedbreakingcapacityoftheinstalledcir cuitbreakersandthecurrentwithstandinglevelofotherequip ments .Furthermore ,with… 相似文献
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顾肇文 《东华大学学报(英文版)》2002,19(3)
IntroductionInnovatinguponastockingmachineoraribtopmachinecanmakeasmallcircularwarp knittingmachine .Itcanknitdecorativemeshstockingwell.Becausethecircularguideunit (C .G .U .)ofthemachinecouldnotwindroundthelatchneedlesinthelap pingmovement,successfullappi… 相似文献