简介:教学设计指导思想与理论依据《2011版课标》中指出'让学生在教师的指导下,通过感知、体验、实践、参与和合作等方式,实现任务的目标,感受成功'。《基础教育课程改革纲要》提出'要改变课程实施过于强调接受学习、死记硬背、机械训练的现状,倡导学生主动参与、乐于探究、勤于动手,培养学生搜集和处理信息的能力、获取新知识的能力、分析和解决问题的能力以及交流与合作的能力'。
简介:Fallingontheninthdaymonth,ChongyangFestivaloftheninthlunarisalsocalledtheDoubleNinthFestival.ItisnamedasChongyangFestivalbecauseaccordingtotheChineseastrology,nineisa"Yang"charactermeaningmasculineorpositiveand"Chong"inChinesemeansdouble.Asboththemonthandthedayarenine,itgotthisname.
简介:Thedoubleconstraintequationsintheself-dualgravitationaltheorycontainingthecosmologicaltermarederivedin3+1gravity.Furthermore,inordertodeeplystudytheLorentzianandEuclideanrealityconditionsforthistheory,therelationsbetweenconstraintsarediscussedbyintroducingthedoubleconstantconformaltransformationandthedoublecomplexfunctionmethod.
简介:GivenanewDouble-MarkovriskmodelDM=(μ,Q,ν,H;Y,Z)andDouble-MarkovriskprocessU={U(t),t≥0}.Theruinorsurvivalproblemisaddressed.Equationswhichthesurvivalprobabilitysatisfiedandtheformulasofcalculatingsurvivalprobabilityareobtained.Recursionformulasofcalculatingthesurvivalprobabilityandanalyticexpressionofrecursionitemsareobtained.TheconclusionsareexpressedbyQmatrixforaMarkovchainandtransitionprobabilitiesforanotherMarkovChain.
简介:杜甫诗“重阳独酌杯中酒,抱病起登江上楼。”苏轼诗“登山作重九,蛮菊秋未花。”农历九月九日,二九相重,曰重九;九为阳数,又曰重阳。
简介:PopulisminWesterndemocraciesisontherise.Whatwasonceconfinedtooutliersandextremepoliticalpartiesisnowtearingawayintothewholepoliticalsystem.Inflammatoryspeechesandcriticsofso-called'fakenews'madebyDonald
简介:AbstractReverse genetics via targeted modification of gene sequences to obtain a phenotype and the inference of a gene's function or regulatory mechanism is widely used as a potent tool in viral biology and application. However, while reverse genetics has contributed significantly to our understanding of molecular biology and the pathogenesis of viruses, its accessibility (operation) and openness (data) have raised many concerns regarding biosafety and biosecurity. In this review, we retrospectively examine the development of reverse genetics and its applications in virology, then emphasize global biosafety and biosecurity concerns regarding reverse genetics, and summarize global regulations, governance, and laws on reverse genetics. This review seeks to enhance our understanding and rational application of reverse genetics technology for the benefit of humankind.
简介:ThetransmissiondelayofphotogeneratedcarriersinaCMOS-process-compatibledoublephotodiode(DPD)isanalyzedbyusingdevicesimulation.TheDPDsmallsignalequivalentcircuitmodelwhichincludestransmissiondelayofphotogeneratedcarriersisgiven.Fromanalysisonthefrequencydomainofthecircuitmodelthedevicehastwopoles.OnehastherelationshipwithjunctioncapacitanceandtheDPD'sload,theotherwiththedepthandthedopingconcentrationoftheN-wellintheDPD.DifferentdepthoftheNwellanddifferentareaoftheDPDswithbandwidthwerecompared.TheanalysisresultsareimportanttodesignthehighspeedDPDs.
简介:这篇论文论述一个有弹性地连接的双板系统的免费、强迫的横过的颤动的分析、数字的分析。联合部分微分方程的一个系统的分析答案,描述相应动态免费、强迫的过程,用Bernoulli的特别积分和Lagrange变化常数的方法被获得。因为强迫的颤动由一个频率导致了外部刺激和相应起始的条件,一个模式颤动才为起始的条件并且到三频率的政体导致的免费颤动对应于二频率的政体。分析解决方案证明在盘子之间的有弹性的连接导致时间功能的二频率的政体的外观,它对应于一个模式的一个eigenamplitude函数,并且也,时间不同颤动模式工作,这为颤动的每形状被解开。它为两块有弹性地连接的板被证明了那,为每m和n,为回声的外观的二可能性动态状态,以及为动态吸收的外观,是在场的。用MathCad程序,整个时间的板中间表面的典型形式的相应可视化被介绍。
简介:Adistibutedoptimallocaldoubleloop(DOLDL)networkispresented.EmphasisislaidonthetopologyanddistributedroutingalgorithmsfortheDOLDL.Onthebasisofbuildinganabstractmodel,asetofdefinitionsandtheoremsaredescribedandproved.Analgorithmwhichcanoptimizethedoubleloopnetworksispresented.TheoptimalvaluesofthetopologicparametersfortheDOLDLhavebeenobtainedbythealgorithm,andthesenumer.calresultsareanalyzed,Thestudyshowsthattheboundsoftheoptimaldiameter(d)andaveragehopdistance(a)forthisclassofnetworksareand,respectively(Nisthenumberofnodesinthenetwork.「3≤N≤10~4).AclassofthedistributedroutingalgorithmsfortheDOLDLandtheimplementationprocedureofanadaptivefault-tolerantalgorithmareproposed.Thecorrectnessofthealgorithmhasbeenalsoverifiedbysimulating.
简介:枚举盖住设计的图的几种类型的同晶型班是在计算的拓扑的图理论的中央研究话题之一。如果它的盖住的图是circulant,G盖住的A被称为circulant。最近,作者[分离数学,277,73鈥?5(2004)]枚举circulant的同晶型班某个类型的两倍覆盖物,叫了典型盖住,并且证明两倍原子价三的一张circulant图盖住都不是circulant。另外,在里面[图和组合数学,21,386鈥?00(2005)],circulant的同晶型班加倍原子价的一张circulant图的覆盖物四被枚举。在这篇论文,circulant的同晶型班加倍原子价的一张circulant图的覆盖物五被枚举。盖住的关键词图-电压赋值-Cayley-circulant图先生(2000)题目分类05C10-第一写作的05C30被中国(号码60473019和10571005)的NSF并且由NKBRPC(2004CB318000)支持,并且第二个作者被Com2MaC鈥揔OSEF在朝鲜支持
简介:Windsontheeartharecommonlystrongenoughtoerodetransportanddepositsediment.Themodesofsandtransportbythewindaregreatlydifferentfromthosebywaterflow.Ontheotherhandwind-blownsandsareofamaterialcirculationprocessoftheearthsurface.Theyaffectwind-sandtransportfluxandsandejectionofaflux,thedamageofgrainsformedcannotbeneglectedinengineering.Becauseofthecomplexityofwindblownsandfluxsystem,theunderstandingofitsbasicmechanicsisnotyetclear.Thekeyforcesinsandsalutationmainlyincludes:thevalidgravity,airdragforce'Magnusforce'Saffmanforce'Bassetforce'additionalqualityforceandscatterforceamonggrains.Themostimportantforceinsandsalutationistheairdragforce.Computationofthesinglespheredragcoefficientanddoublespheresdragcoefficientispresentedforthedistancebetweentwospheresbeingsmallerthantwelvetimesofthespherediameterandthespheresbeingatdifferentangularpositions.Theflowinterferenceoftwosphereswasinvestigatedforthedistances=0.08dto12d,angularpositionθ=0to360andReynoldsnumber1≤Re≤1000.