简介:Thevolumesperoxygenofsomesilicatemeltshavebeencalculatedandthencomparedwiththoseofsilicateglasses.Itissuggestedthatthevolumeofasilicatemeltcanbedividedintotwoparts.Oneiscontributedbythesilicon-oxygennetworkandtheotherbythe“oxides”.VariationpatternsofVPOssuggestthatthevolumeoftheSi-Onetworkgenerallyremainsunchangedandtheexpansionofthemeltiscausedmainlybythelocatexpansionofthe“oxides”.ItisfurtherproposedthattheradiusofO^2-showslittlevariation,instrikingcontrasttotheradiusofcations.Themechanismgoverningtheexpansionisdiscussedindetail.
简介:让R是一枚恰好协调的戒指和Db(R-Mod)左R模块的围住的导出的范畴。由\表示({D^b}{\left({R-现代派}\right)_{\widehat{\left[{GF,C}\right]}}}\)与两种有限Gorenstein扁平的尺寸和cotorsion尺寸和Kb(FC由所有建筑群组成的Db(R-Mod)的子范畴)扁平的cotorsion的围住的homotopy范畴离开了R模块。我们证明商triangulated范畴\({D^b}{\left({R-现代派}\right)_{\widehat{\left[{GF,C}\right]}}}\)/Kb(FC)完全是到所有Gorenstein的Frobenius范畴的稳定的范畴GFC的三角等价物,cotorsion离开R模块。
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简介:ThepreviouspaperreportedanewderivativeintheEuleriandescriptioninflatspace—thegeneralizedcovariantderivativeofgeneralizedEuleriancomponentwithrespecttotime.ThispaperextendsthethoughtfromtheEuleriandescriptiontotheLagrangiandescription:onthebasisofthepostulateofcovariantforminvariabilityintimefield,wedefineanewderivativeintheLagrangiandescriptioninflatspace—thegeneralizedcovariantderivativeofgeneralizedLagrangiancomponentwithrespecttotime.Besides,thecovariantdifferentialtransformationgroupissetup.ThecovariantforminvariabilityofLagrangianspace-timeisascertained.
简介:ThispaperreportsanewderivativeintheEuleriandescriptioninflatspace-thegeneralizedcovariantderivativewithrespecttotime.Thefollowingcontentsareincluded:(a)therestrictedcovariantderivativewithrespecttotimeforEuleriancomponentisdefined;(b)thepostulateofthecovariantforminvariabilityintimefieldissetup;(c)thegeneralizedcovariantderivativewithrespecttotimeforgeneralizedEuleriancomponentisdefined;(d)thealgebraicstructureofthegeneralizedcovariantderivativewithrespecttotimeismadeclear;(e)thecovariantdifferentialtransformationgroupintimefiledisderived.TheseprogressesrevealthecovariantforminvariabilityofEulerianspaceandtime.
简介:Thegeneralequationsofsecondaryinstabilitywithrespecttothree-dimensionalsubharmonicdisturbancesarederivedandappliedtoBlasiusboundarylayerinthepresentpaper.Thetheoreticalresultsofevolutionandspatialdistributionofsubharmonicdisturbancesarecomparedwithexperimentaldata.There-suitsshowtheimportantroleoftheprocessofroutetotransitioninlow-disturbanceenvironments,andindi-catethatspatialmodeismorerationalthantemporalmode.
简介:Inthispaperbasicresultsforatheoryoforthogonalmatrixpolynomialswithrespecttoaconjugatebilinearmatrixmomentfunctionalareproposed.Propertiesoforthogonalmatrixpolynomialsequencesincludingathreetermmatrixrelationshiparegiven.PositivedefiniteconjugatebilinearmatrixmomentfunctionalsareintroducedandacharacterizationofpositivedefinitenessintermsofablockHaenkelmomentmatrixisestablished.Foreachpositivedefiniteconjugatebilinearmatrixmomentfunctionalanassociatedmatrixinnerproductisdefined.
简介:Inthecrucialperiodofbuildingamoderatelyprosperoussocietyanddeepeningreformandopeningup,andofacceleratingthetransformationofeconomicdevelopment,the18thNationalCongressoftheCommunistPartyofChina,whichwasheldinNovember2012,madecomprehensivearrangementsfortheundertakingsofboththePartyandtheState,furtherclarifiedthegoalsandgrandblueprintforfuturedevelopmentinthenextperiod,andleftanimportantandfarreachingimpactonthedevelopment
简介:Currentproceduresformass-flowhopperdesignarebasedontheradialstresstheorydevelopedbyJenikeandinvolvethedeterminationofthecriticaloutletdimensionsforflowtobeinitiated.Theseproceduresignorethesurchargeloadsonthehopperandinvolveastudyofthepassiveorarchedstressfieldthatexistsunderflowconditions.Analternativeapproachasappliedtohopperwallloadanalysisistoemploythehorizontalslicemethod.Thearchedstressfieldandhorizontalslicemethodsofanalysisarecompared.Theinfluenceofsurchargeloadsinthedeterminationofhoppergeometryisinvestigated.
简介:Thinkingabilityofaman,whichisthecoreofwisdom,participatesinanddominatesalltheintellectualactivities.Thisstudy,pursuedontheontologicalandpracticallevel,isaimedatcultivatinglearners’thinkingabilitiesinforeignlanguageteaching(FLT)inbasiceducationofChina.RegardingEnglishteachingreforminbasiceducationofChinaasthebackground,thisthesisprobestobringittotheforefrontandputforwardapproachesandstrategiesofincorporatingthecultivationoflearners’thinkingabilitiesintoeveryaspectoftheteachingprocedures.