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简介：Therandomstepmaneuverwithuniformlydistributedstartingtimeshasthedisadvantagethatitcannotfocusthestartingtimeonthemoreefficiencytime.Itdecreasesthepenetrationprobability.Toresolvethisproblem,arandomsteppenetrationalgorithmwithnormaldistributionstartingtimeisproposed.Usingtheshapingfiltersandadjointsystemmethod,themissdistancewithdifferentstartingtimescanbeacquired.Accordingtothepenetrationstandard,thetimewindowensuringsuccessfulpenetrationcanbecalculatedanditisusedasthe3σboundofthenormallydistributedrandommaneuver.Simulationresultsindicatethatthenormallydistributedrandommaneuverhashigherpenetrationprobabilitythantheuniformlydistributedrandommaneuver.

简介：WediscussavariantofrestartedGMRESmethodthatallowschangesoftherestartingvectorateachcycleofiterations.Themeritofthevariantisthatpreviouslygeneratedinformationcanbeutilizedtoselectanewstartingvector,suchthattheoccurrenceofstagnationbemitigatedortheconvergencebeaccelerated.ThemoreappealingutilizationofthenewmethodisinconjunctionwithaharmonicRitzvectorasthestartingvector,whichisdiscussedindetail.Numericalexperimentsarecarriedouttodemonstratethattheproposedprocedurecaneffectivelymitigatetheoccurrenceofstagnationduetothepresenceofsmalleigenvaluesinmodulus.

简介：底价拍卖是在传统的拍卖理论的热研究问题之一。这里，我们在联机拍卖学习开始的价格，在传统的拍卖的公共底价的对应物。由认为象eBay一样的三个特征联机，投标人(到泊松过程的题目)的auctions:stochastic入口，与开始的价格成正比的插入费用，和时间打折，我们为最大化分析了开始的价格的极值点的性质卖主期望了收入，并且发现了那，在某些条件下面，最佳的开始价格应该在最低许可的水平，它与从经典拍卖理论的结果相反并且事实上发现它的optimality。我们也开发了多级式的拍卖的一个一般扩大模型并且在它的性质上执行了分析。最后，为进一步的研究的一些方向也被提出。

简介：ThispaperisconcernedwiththeanalysisofafeedbackM[X]/G/1retrialqueuewithstartingfailuresandgeneralretrialtimes.Inabatch,eachindividualcustomerissubjecttoacontroladmissionpolicyuponarrival.Iftheserverisidle,oneofthecustomersadmittedtothesystemmaystartitsserviceandtherestjoinstheretrialgroup,whereasalltheadmittedcustomersgototheretrialgroupwhentheserverisunavailableuponarrival.Anarrivingcustomer(primaryorretrial)mustturn-ontheserver,whichtakesnegligibletime.Iftheserverisstartedsuccessfully(withacertainprobability),thecustomergetsserviceimmediately.Otherwise,therepairfortheservercommencesimmediatelyandthecustomermustleavefortheorbitandmakearetrialatalatertime.ItisassumedthatthecustomerswhofindtheserverunavailablearequeuedintheorbitinaccordancewithanFCFSdisciplineandonlythecustomerattheheadofthequeueisallowedforaccesstotheserver.TheMarkovchainunderlyingtheconsideredqueueingsystemisstudiedandthenecessaryandsufficientconditionforthesystemtobestableispresented.Explicitformulaeforthestationarydistributionandsomeperformancemeasuresofthesysteminsteady-stateareobtained.Finally,somenumericalexamplesarepresentedtoillustratetheinfluenceoftheparametersonseveralperformancecharacteristics.

简介：我们报导自我开始的femtosecondCr:forsterite激光由1064-nmYb抽了的高度有效、高的力量做了纤维激光。五啁啾镜子被用来补偿intra洞组延期分散，并且锁模式被一个半导体开始可饱和的吸收器镜子(SESAM)。在7.9W的泵力量下面，有760mW的平均力量的稳定的femtosecond激光脉搏被获得，产出12.3%的泵力量斜坡效率。测量脉搏持续时间并且光谱带宽(FWHM)是46fs和45nm；重复率是82MHz。[从作者抽象]

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简介：<正>Lastyear,1998,wasanextraordinaryyear.Inthefaceoffinancialtur-moilinternationallyandrecord--breakingfloodsdomestically,wehavestoodseveretests.Themacroeconomiccontrolpolicyadoptedbythecen-tralauthoritiestoexpandinvestmentinordertoprovideincentivestodo-mesticdemandyieldedpositiveresultsandtheeconomicgrowthratereached7.8percent.Howevertheinvestmentexpansionwasonlythebe-

简介：GABAtransporter1(GAT1)takesimportantrolesinmultiplephysiologicalprocessesthroughtheuptakeandreleaseofGABA,buttheregulationofGAT1geneexpressionindifferenttissuesisrarelyknown.Toaddressthequestion,first,5'RapidamplificationofcDNAend(RACE)wasusedtodetermineGAT1transcriptionalstartingsitesinneonatalmousecerebralcortexandintestine,adultmousebrainandadultrattestis.Theproductsof5'RACEwereconfirmedbyDNAsequencing.WefoundthatthetranscriptofGAT1inneonatalmousecerebralcortexandadultmousebrainstartsatthesamesite(insideofexon1),whileinmouseintestine,GAT1startstranscriptioninintron1,andinrattestis,thetranscriptofGAT1hasanadditionaluntranslationexontothe5'direction.

简介：Asthefirstacrobaticartistictroupewiththeperformanceonice,HeilongjiangAcrobaticsandDancingonIceTroupehasbeenonafastdevelopingwayinvirtueofherperseveranceonacrobaticsandhasstartedtoshineuniquelyintheperformancemarketsinceherfounding.

简介：Inresponsetothechallengeinherentinclassicalhigh-dimensionalmodelsofrandomgroundmotions,afamilyofsimulationmethodsfornonstationaryseismicgroundmotionswasdevelopedpreviouslythroughemployingawave-grouppropagationformulationwithphasespectrummodelbuiltuponthefrequencycomponents’starting-timeofphaseevolution.Thepresentpaperaimsatextendingtheformulationtothesimulationofnon-stationaryrandomseismicgroundmotions.ThegroundmotionrecordsassociatedwithN–ScomponentofNorthridgeEarthquakeatthetype-IIsiteareinvestigated.Thefrequencycomponents’starting-timeofphaseevolutionofisidentifiedfromthegroundmotionrecords,andisprovedtoadmittheGammadistributionthroughdatafitting.Numericalresultsindicatethatthesimulatedrandomgroundmotionfeatureszeromean,non-stationary,andnon-Gaussianbehaviors,andthephasespectrummodelwithonlyafewstarting-timesofphaseevolutioncouldcomeupwithasoundcontributiontothesimulation.更多还原

简介：Themarinemedium-speeddieselenginesarestartedbytwomethods;oneistheelectricmotors,andtheotherairstartingmotors.Eventhoughairstartingmotorisdependentoftheenginetypesandsizes,ithasbeenwidelyusedinthisareaduetoitssimplicity,convenienceandreliability.Thepurposeofthispaperistogivethedesigningparametersinordertomakeaproper'AirStartingMotor'usingCFD.Theaerodynamicapproachesweregiventounderstandtheinternalflowcharacteristicsoftheairstartingmotor.Inaddition,wehavecarriedouttheinvestigationofeffectsoftipclearance.Inthecalculationsthetipclearanceofairstartingmotorhasbeenvariedbetween0,2.8,4.3and5.7%ofbladespan.Theresultsofcomputationarethetipclearanceincreasedto2.8%,thetorquedecreased24%,andtherewasnomorelargechangeswhentheclearancesincreasedto4.3%and5.7%.

简介：Background:The2mostcitedsportsinjurypreventionresearchframeworksincorporateinterventiondevelopment,yetlittleguidanceisavailableinthesportsscienceliteratureonhowtoundertakethiscomplexprocess.Thispaperpresentsageneralizableprocessfordevelopingimplementablesportsinjurypreventioninterventions,includingacasestudyapplyingtheprocesstodevelopalowerlimbinjurypreventionexercisetrainingprogram(FootyFirst)forcommunityAustralianfootball.Methods:Theinterventiondevelopmentprocessisunderpinnedby2complementarypremises:(1)thatevidence-basedpracticeintegratesthebestavailablescientificevidencewithpractitionerexpertiseandenduservaluesand(2)thatresearchevidencealoneisinsufficienttodevelopimplementableinterventions.Results:Thegeneralizable6-stepinterventiondevelopmentprocessinvolves(1)compilingresearchevidence,clinicalexperience,andknowledgeoftheimplementationcontext;(2)consultingwithexperts;(3)engagingwithendusers;(4)testingtheintervention;(5)usingtheory;and(6)obtainingfeedbackfromearlyimplementers.Followingeachstep,interventioncontentandpresentationshouldberevisedtoensurethatthefinalinterventionincludesevidence-informedcontentthatislikelytobeadopted,properlyimplemented,andsustainedovertimebythetargetedinterventiondeliverers.ForFootyFirst,thisprocessinvolvedestablishingamultidisciplinaryinterventiondevelopmentgroup,conducting2targetedliteraturereviews,undertakinganonlineexpertconsensusprocess,conductingfocusgroupswithprogramendusers,testingtheprogrammultipletimesindifferentcontexts,andobtainingfeedbackfromearlyimplementersoftheprogram.Conclusion:Thissystematicyetpragmaticanditerativeinterventiondevelopmentprocessispotentiallyapplicabletoanyinjurypreventiontopicacrossallsportssettingsandlevels.Itwillguideresearcherswishingtoundertakeinterventiondevelopment.

简介：摘要：Starting out，作为外研版新教材中单元的首个组成部分，涵盖了广泛的主题，包括但不限于watching the video、问题回答、表格填写或者录音听取、图片观看等，内容十分丰富。Starting out部分实施了新课程标准的导入要求，以激发学生的背景知识和语言技能。在高中英语的授课过程中，教师应当充分利用Starting out板块，以提升高中英语单元导入效率，从而增强学生的整体学习效果。因此本文对利用Starting out版块提升高中英语单元导入效率进行了具体分析，以期为相关人士提供一些参考。

简介：March28ofthisyearisthesecondTibetanSerfsEmancipationDay.PeopleofallnationalitiesinTibetmarkedthedaybyhoistingthenationalflagandbysinginganddancing.Smileswereoneveryfaceandafestiveatmospherepervadedthesnow-coveredplateauregion.

简介：Hexagonplate-likeAl8B4C7powdersweresuccessfullysynthesizedusingamixtureofdiborontrioxide,activatedcarbonandaluminumoraluminabyacarbothermalreductionprocess.TheeffectofAlsourceandstartingmaterialsadditionsonsynthesisofAl8B4C7wasinvestigated.ThephasecompositionandmicrostructureofAl8B4C7powderwerecharacterizedbymeansofXRD,SEMandEDS.ThemainphasecompositionsoftheproductssynthesizedfromAl,B2O3andactivatedcarbonareAl8B4C7andAl2OC.Al2O3canreplaceAltosynthesizeAl8B4C7.Al8B4C7grainssynthesizedfromAl2O3,B2O3andactivatedcarbonarehexagonplate-likeandhaveathicknessof10μmandasizeofabout100μm.