共查询到20条相似文献,搜索用时 31 毫秒
1.
IntroductionThemostcommonmethodofyarnproductionistheinsertionofcontinuous ,unidirectionaltwistintoaparallelarrayoffibersorfilaments.Thehightorsionalstressesgeneratedinsuchaprocesshaveaconsiderableeffectonthestabilityandmechanicalcharac teristicsoftheya… 相似文献
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Introduction Towanttochangeisthebasiccharacterofhumanbeings.Colorchangesreflectamyriadofelementsfromdesignandsomecharacteristicssuchasfineart,aswellaseconomics,politics ,tra ditionalcultureandpsychologicalmoods.Inordertokeepupwiththechangingcolorandmak… 相似文献
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显著提高大肠杆菌中外源基因表达产物可溶性的双顺反子表达载体pNJUTRX-1 总被引:1,自引:1,他引:0
TheexpressionofheterologousproteinsinEscherichiacolihasbecomeastandardtech niqueinmolecularbiology .E .coliexpressionsystemshavetheadvantagesofproductioneco nomicsandlogistics .TheseadvantageshavemadeE .coliexpressionsystemapopularchoicefortheproductionof… 相似文献
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SinceWhiteobservedthatsprayingtobaccoplantswithsalicylicacid (SA)oracetylsalicylicacidinducedresistancetoinfectionwithtobaccomosaicvirus[1] ,manyexperimentshavedemonstratedthatSAplaysanimportantroleinplantdiseaseresistance ,actingasanendogenoussignalmolec… 相似文献
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IntroductionAnonoscillatorysecondordercentraldifferenceschemeforhyperbolicconservationlawswasdevelopedbyNessyahuandTadmor[1](theNTscheme)fromthefirstorderLaxFriedrichs(LxF)scheme.IntheNTscheme,secondorderpiecewiselinearfunctionswereusedinsteadoffirstorde… 相似文献
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IntroductionStarchisakindofnaturalpolysaccharidewidelyusedasrawmaterialinchemicalindustry .Withthedwindlingsuppliesofpetroleum ,theusageofstarchwidelyspreadsindifferentfieldsbecausestarch sabundanceandlowcost.Graftpolymerizationofsodiumacrylateontostarc… 相似文献
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IntroductionFiber reinforcedcompositesareusedextensivelyinmanyweightcriticalapplications ,duetotheirhighspecificmodulus,highspecificstrength ,andthecapabilityofbeingtailoredforaspecificapplication .Thesematerialsofferdefiniteadvantagescomparedwithmostoft… 相似文献
8.
Packingsandpackedcolumnsarewidelyusedinmanyprocessesinchemicalindustryandenvironmentaltechnology .Incontrasttoplasticandceramicmaterials ,stainlesssteelpackingsownadvantagesfortheirelasticityandfirmness.However,theirmasstransferperformancehasrecentlybee… 相似文献
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《西南师范大学学报(自然科学版)》1999,(5)
Aschiefconstitutivecomponents,evergreenanddeciduousplants(especiallyevergreenanddeciduoustreespecies)playanimportantroleinthebiomassproductionofforests.However,theireffectsonforestproductivityarenottotallythesame,onecriticalreasonistheirsignificantp… 相似文献
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IntroductionElectrolessNi Pplatingalloywhichbearsexcellentqualitiesofanti causticityandanti attritionhasabroadapplicationsintheindustryproduction Butinsomecases,itcannotgetgoodresultsbyusingonlyNi Pplatingalloyassurfacedefenseorconsolidationmaterials It… 相似文献
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IntroductionLinearminimumvariancedstepaheadpredictorsaremostlypopularinmanyfieldsofapplication,suchasprocesscontrolprediction,adaptivecontrol,andeconomicprediction[1,2].Thispaperdiscussesthepracticeofcomputingcurrentpredictorformsandpresentsasetofrecursi… 相似文献
12.
LIUXiao- juan 《井冈山学院学报》2001,(2)
Forcenturies,therehasbeenaneverincreasinginterestinthenatureofreadingprocess,andmanyoftheseattemptstodescribetheprocesshavebeeninconflictwitheachother,whichmakesusreaderscon fusedinunderstandingandappreciatingatext,espe ciallyaliteraryone.Traditionall… 相似文献
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Recently ,theresearchofartificialsuperlatticeshasbeenahottopicincondensedmatterphysicsandmaterialsfield .Before 1 984,researchworksonsuperlatticesweremainlyfocusedonperiodicstructures .Thediscoveryofquasicrystalhasopenedupanewfieldincondensedmatterphysicsa… 相似文献
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IntroductionThedesireforanoptimaldiscretizationschemeremainsoneofthecriticalissuesincomputationalfluiddynamicsandnumericalheattransfer[1,2].Anoptimalschemepossessesaccuracy,stability:boundedness(nounphysicaloscillations)andalgorithmicsimplicity.Themaincon… 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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IntroductionSchedulingasanoperationsplanningproblemisconcernedwiththeallocationofresourcesovertimetoperformvarioustasks.Inaflexiblemanufacturingsystem (FMS)environment,schedul inggainsspecialimportanceduetothehighlevelautomationandconsiderationsofadditi… 相似文献
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利用RAPD分子标记研究农用化学品污染土壤微生物群落的分子多样性 总被引:5,自引:1,他引:4
Agriculturalchemicalscanaffectphysiologyandbiochemistryofsoilmicrobesalthoughtheyundoubtedlyhavegreatbenefitsformodernagriculture .Previousstudiesontheeffectsofagriculturalchemicalsonsoilmicrobialcommunitieshavebeenmostlyfocusedonsoilrespira tion[1] ,soi… 相似文献
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IntroductionNitricoxide(NO)usedtoberegardedonlyasatoxicgasmolecule .Nowit provesthatNOisamessengerinbiologicalsystematicsignaltransductioncascadesanditistheunique gassignalmolecule ,leadingtonumerousbiochemical,cellular ,andphysiologicalresponses .Especial… 相似文献
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Thethroughputandresponsespeedofserverscanbeimprovedbyconnectingseveralcheapermachinesinalocalnetworkasacluster,actingasonepowerfulserverthroughtheparallelprocessing[1-3].Itischeaper,moreflexible,andmorereliable,hencemanyWebsiteshavealreadyinstalledWe… 相似文献
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Liu Xiao |ling Cai Ru |xiu Yuan Hong College of Chemistry Molecular Sciences Wuhan University Wuhan Hubei China 《武汉大学学报:自然科学英文版》2003,8(1):99-100
Interestisrapidlyemergingintheexplorationofmetalnanoparticlesforthedetectionofvariouskindsofmolecules.ExcellentexamplesincludeDNAdetectionbycomplimentaryinteractionsofthiol \|containingDNAattachedtogoldnano particles[1] ,potassiumionsensorsbyusing 15 crown … 相似文献