简介：Thedynamicstressintensityfactorofathree-dimensionalellipticcrackunderimpactloadingisdeterminedwiththefiniteelementmethod.Thecomputationresultscantakeintoaccounttheinfluenceoftimeandtheratioofthewavespeedsonthestressintensityfactor.Thepresentmethodissuitablenotonlyforthree-dimensionaldynamiccrack,butalsoforthree-dimensionaldynamiccontact.

简介：Inthispaper,thefollowingproblemsarediscussed:themountingconditionsofthreeprobes,thetransmissioncharacteristicsofmeasuringsystem,theeliminationofmountingeccentricity,andsoforth.Themeasuresforsolvingtheseproblemsarealsopres-ented.Atlast,theauthorgivessomeideasaboutthesolubilityandthecorrelationsoftheoutputequations.

简介：TopredictthefuturedevelopmentofChina-U.S.relations,wshouldattachimportancetothethreenewcharacteristicsofthisbilateralrelationship.First,weshouldseeclearlythechangesoftheprincipacontradictioninSino-Americanrelations,whichisthekeylinkinunderstandingthebilateralrelationshipfromthestrategicand

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简介：Takingintoconsiderationthecharacteristicsofnowadayssociety,thispaperhasadvancedthesystemicthinkingonthebuildingofEnterprises'"ThreeCycle"IntegrationStructure.Afterpointingout,theprinciplesofoptimizationbetweentheoreticstructureandexecutivestructure,thispaperhasbroughtforwardtheEnterprises'"ThreeCycle"IntegrationStructureanditsinherentrelationshipamongeachcycle.

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简介：AnexperimentwasconductedtostudytheeffectsofdifferentPbconcentrationsonriceseedgerminationandseedlinggrowthinthreecultivars(Jiayu293,Jiayu948andXieyou963).ThemethodofqualitativetraitscombiningwithquantitativetraitsbyorthogonalpolynomialswasappliedtoanalyzericeseedvigorbyregressionmodelTheseedsfromdifferentricecultivarshaddifferentsensitivitytoPbpoison.InthePbconcentrationof100-700mg/L,Pbsignificantlydecreasedrootlengthandshootheight,andthedegreeoftherestraintwouldaggravatewiththeincreasingofPbconcentration.However,Pbdidnotreducerootdryweightandshootdryweight,whichindicatedthatdifferentphysiologicalcharacteristicshaddifferentsensitivereactionstoPb.Thepredictingequationsofregressionweredeveloped,whichcouldbeusedtopredicttheeffectsofdifferentPbconcentrationsonriceseedvigor.

简介：Theobjectiveofthisstudyistocharacterizethethree-dimensionalfluidflowinthevesselcontainingoneceramiccandlefilter.Thethree-dimensionalgoverningequationsareformulatedinthisstudyandtheturbulentκ-εmodelisadoptedforthenumericalcomputation.Itisfoundthattheviscousforceisdominantintheporousregionwithcomparedtoinertiaforce.Pressuedecreaseslinearlywhentheflowpassingthroughtheporousmedium.Whenthefacevelocityis0.03m/s,thepressuredropisabout350Pa.Ithasalsobeenfoundthatthefluidwiththespiralmotiontobesunkintothefilterinthevessel.

简介：TheupperYangtzeupstreamofYichangwithadrainageareaof1,000,000km~2bringsanaverageannualrunofftoYichangby450km~3ofriverwater,thedrasticvariationandunevendistributionofwhichoftencausesseverefloodsforfer-tilealluvialplainsofmiddleandlowerYang-

简介：Asystemofthree-unitnetworkswithcoupledcellsisinvestigated.ThegeneralformulaforbifurcationdirectionofHopfbifurcationiscalculatedandtheestimateformulaofperiodoftheperiodicsolutionisgiven.

简介：OnNovember18,2001,thesecondphasecofferdamofThreeGorgesProjectwasstartedtodismantle.Thedismantlementofcofferdamwithheightof80oddm,weircrestwidthof15mandoveralllengthof2.4km,marksthebeginningofthesecondtimecutoffofThreeGorgesProject—thecutoffofdiversion

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简介：Thisstudywasconductedtoevaluatethecriticalthermalmaximum(CTMax),theroutinemetabolismrate(MO2)andthelimitingoxygensaturation(LOS)ofthreesalmonidswithfourdifferentbodyweightsrangingfrom16gto131g.TheCTMaxwasestimatedatthreedifferentheatingratesincluding0.5℃min^-1,1℃h^-1and2℃d^-1.ResultsshowedthattheCTMaxofmapletrout(Oncorhynchusmykiss)wasthehighest,whichwasfollowedbysteelheadtrout(O.mykiss)andAtlanticsalmon(Salmonsalar).TheCTMaxofthesalmonidfishdecreasedwiththeincrementofbodyweight,andwassignificantlyinfluencedbytheheatingrate.TheMO2ofthesalmonidfishincreasedwiththeincrementoftemperature,anddecreasedwiththeincrementofbodyweight.Suffocationpointsofthefishdecreasedwithincreasingbodyweightandtemperature.SteelheadtroutwasmoretoleranttohypoxiathanmapletroutandAtlanticsalmon,whiletheMO2ofAtlanticsalmonwasthehighestamongthesethreesalmonids.TheLOSofthefishgenerallyhadapositivetrendwithtemperatureandbodyweight,andtheLOSofsteelheadtroutwassignificantlylowerthanthatofmapletroutandAtlanticsalmon.Inconclusion,mapletroutwasthemosttolerantkindtohightemperature,whilesteelheadtroutwasthemosttoleranttohypoxiaamongthreekindsofsalmonids.Moreover,theabilitiestotoleratehighertemperatureofthreesalmonidswereaffectedbytheirbodyweightandtheheatingrate,whiletheabilitiestotoleratehypoxiawereinfluencedbytheirbodyweightandthewatertemperature.

简介：Inthispaper,thenotionoftheboundedcompactapproximationproperty(BCAP)ofapair[Banachspaceanditssubspace]isusedtoprovethatifXisaclosedsubspaceofL∞withtheBCAP,thenL∞/XhastheBCAP.WealsoshowthatX*hastheλ-BCAPwithconjugateoperatorsifandonlyifthepair(X,Y)hastheλ-BCAPforeachfinitecodimensionalsubspaceY∈X.LetMbeaclosedsubspaceofXsuchthatM⊥iscomplementedinX*.IfXhasthe(bounded)approximationpropertyoforderp,thenMhasthe(bounded)approximationpropertyoforderp.

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简介：From1990to2000,weusedHanssonpin,AOhollow-pullingscrew,andbendablescrewtotreat150casesoffreshfemoralneckfractureandtheresultwasanalysedtocomparetheefficacyofthethreemethodsofinternalfixation.

简介：新伪直角的时空块代码(QO-STBC)基于有更低的译码的复杂性和更高的位错误统计(BER)的父亲代码，性能最近被派克·乌建议，它能获得完整的传播率和完整的差异。在这篇文章，作者基于旋转父亲代码建议了一个改进派克·乌计划。为消除在信号察觉期间源于附近的信号的干扰术语，二个不同矩阵被使用。并且当在接收装置的最大可能性的的译码被使用时，译码的独立人士能被认识到。模拟结果证明没有与派克·乌计划相比增加译码的复杂性，BER表演戏剧性地被改进。

简介：Thispaperinvestigatestheproblemofmodelingandcontrollingpursuerconvoyinthree-dimensionalspace.Theguidancelawsappliedforconvoy,thevelocitypursuit,thedeviatedpursuitandtheproportionalnavigation,steerthepursuerusingtherateofline-of-sight（LOS）betweensuccessivepursuers.Onthebasisofthedifferentialequationsfortherange,thepitchangleofLOSandtheyawangleofLOSbetweensuccessivepursuers,theguidancelawsareproposedtoderivedecentralizedcontrolstrategyforpursuerconvoy.Theresultsconcerningthepursuerconvoyarerigorouslyproven.Simulationsareconductedtodemonstratethefeasibilityandeffectivenessoftheproposedcontrolstrategy.