简介：

简介：最小的dilaton模型(MDM)由叫的dilaton和dilaton顶夸克搭挡把t'称为的一汗衫数量扩大标准模型。在这个工作，我们调查t'-induced放射的修正到Higgs-strahlung生产过程e+在未来Higgs的eZh工厂。我们首先详细介绍分析计算并且显示出怎么处理紫外分叉。然后，我们由从精确electroweak数据考虑限制数字地计算修正。我们发现那，为罪恶L=0.2并且mt'=1200GeV，修正是0.26%和2.1%为，1TeV分别地，并且更大的价值能作为罪恶L增加。

简介：描述了一种采用HPGe探测器γ能谱法无损测量核材料铀样品并计算样品的生产（纯化）年龄与同位素丰度的方法。该方法不需要其他任何标准源或参考源,对样品的形态（固体、液体）和形状没有限制,由铀样品自身所含多γ射线核素的γ能峰来刻度相对峰效率曲线,由能峰计数率、相对效率、γ射线发射概率等参数确定铀同位素的比值,由^234U与其衰变子体214Bi的活度比值计算其生产年龄。对一个铀总量约5g、^235U浓缩度约90%的24mL液体铀样品,用两套HPGe探测器分别测量不同能区范围的γ能谱：在平面型探测系统获取的低能区能谱中,用^235U的γ能峰刻度相对峰效率曲线,计算了^234U、^228Th（232U子体）与235U的相对比值;在同轴型探测系统获取的高能区能谱中,用^228Th及其子体的γ能峰刻度相对峰效率曲线,计算^238U、^214Bi与^228Th的相对比值,综合计算得到铀样品生产年龄（-32a）及铀同位素丰度,并与样品经过放化分离后,质谱法测量得到的结果进行了比较,生产年龄与丰度比偏差均在5%以内符合。

简介：1、基因位于常染色体上的基因频率的计算[遗传平衡定律（哈代一温伯格定律）]某种基因在某个种群中出现的比例．叫做基因频率。某种基因型个体在一个群体中出现的比例。就叫做基因型频率。怎样才能知道某种基因的基因频率呢？

简介：Numericalestimatesforelectronsandmesonsparticle–antiparticlecreationfromvacuuminthepresenceofstrongelectromagneticfieldsarederived,usingthecompleteprobabilitydensityrelationofPopov’simaginarytimemethod(Popov,JETPLett.13,185(1971);Sov.Phys.JETP34,709(1972);Sov.Phys.JETP35,659(1972);PopovandMarinov,Sov.J.Nucl.Phys.16,449(1973);JETPLett.18,255(1974);Sov.J.Nucl.Phys.19,584(1974));(Popov,Phys.Let.A298,83(2002)),andwithintheframeworkofanexperimentalsetupliketheE144(Burkeetal.,Phys.Rev.Lett.79,1626(1997)).Theexistenceofcrossingpointamongpaircreationefficiencycurvesofdifferentphotonenergiesandtheroleofodd/evenmultiphotonordersintheproductionratesarediscussed.Finallyakindoftunabilityprocessbetweenthetwocreationprocessesisdiscussed.

简介：Itisidentifiedthatbarelypassingelectronsarethedriveofthee-Gshbones,ratherthanthebarelytrappedelectronsatlowfrequency.Thefrequencyjumpine-Bshboneexperimentsisreproducedandanalyzed.Itisfoundthatthee-Bshbonefrequencyincreaseswiththehotelectronenergy,whichisconsistentwiththeexperiments.Thegrowthrateofthemode(m=2,n=2)isgreaterthanthatofthemode(m=1,n=1).

简介：Afusionbreedermightbeanessentialintermediateapplicationoffusionenergyatearlierterm,sinceithasthepotentialtoprovideplentyofcommercialfissilefuel.Basedonfusionphysicsandtechnologiesavailableatpresentandinthenearfuture,therealisticfusionexperimentalbreeder,FEB-Ewasdesigned.

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简介：Inthecontextofthetop-color-assistedtechnicolor(TC2)model,theflavor-changingneutral-current(FCNC)interactioninducedbythetop-higgs(h_t~0)arepredictedattreelevel.Westudytherelevantprocessesofe~+e~-(γγ)→th_t~0attheInternationalLinearCollider(ILC).ItisfoundthattheserareprocessesproductionratescanbeenhancedsignificantlyintheTC2model.Especiallyfortheprocessγγ→th_t~0,thetotalcrosssectionwillreachafewfbinthereasonableparameterspace.Wealsocalculatethedistributionsoftransversemomenta,pseudo-rapidandinvariantmassofthetop-higgs.Inviewofthemaindecaymodesoftop-higgsform_(h_t~0)<2m_t,weEndthattherewillbeseveralhundredsFCNCeventsproducedattheILCwithannuallyintegralluminosityof500fb~(-1).Duetothecleanbackground,suchFCNCsignalscanpossiblybedetectedattheILC.

简介：一般大学物理教材中，大都将毕奥-萨伐尔定律dB^→=Δ/4πIdl^→×r^→/r^3作为实验定律直接引入。而张三慧等的(电磁学)中则利用计算电流元中载流子的磁场对毕奥-萨伐尔定律给出了一种较为简洁的推导，这样处理对教学是很有好处的。

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简介：Inthepresentstudy,astatisticalinvestigationiscarriedouttoexplorewhetherthereisarelationshipbetweenthecriticalfrequency(foEs)ofthesporadic-ElayerthatisoccasionallyseenontheEregionoftheionosphereandthequasibiennialoscillation(QBO)thatflowsintheeast–westdirectionintheequatorialstratosphere.Multipleregressionmodelasastatisticaltoolwasusedtodeterminetherelationshipbetweenvariables.Inthismodel,thestationarityofthevariables(foEsandQBO)wasfirstlyanalyzedforeachstation(CocosIsland,Gibilmanna,NiueIsland,andTahiti).Then,acointegrationtestwasmadetodeterminetheexistenceofalong-termrelationshipbetweenQBOandfoEs.Afterverifyingthepresenceofalong-termrelationshipbetweenthevariables,themagnitudeoftherelationshipbetweenvariableswasfurtherdeterminedusingthemultipleregressionmodel.Asaresult,itisconcludedthatthevariationsinfoEswereexplainablewithQBOmeasuredat10hPaaltitudeattherateof69%,94%,79%,and58%forCocosIsland,Gibilmanna,NiueIsland,andTahitistations,respectively.ItisobservedthatthevariationsinfoEswereexplainablewithQBOmeasuredat70hPaaltitudeattherateof66%,69%,53%,and47%forCocosIsland,Gibilmanna,NiueIsland,andTahitistations,respectively.

简介：Inthispaperwepresentanovelnanoantenna(nantenna)designforenergyharvesting.Thenantennahasan'E'shapeandisplacedonaSiO2substrate.ItsoperationisbasedontheexcitationofsurfaceplasmonpolaritonsthroughthegoldarmsoftheEshape.Byvaryingthelengthsandwidthsofthearms,twooverlappingworkingbandwidthscanbeachieved.Thisresultsinawidebandbehaviorcharacterizedbyafullwidthathalf-maximumofabout2.2μmcenteredaround3.6μm.TwoorthogonalEnantennasareplacedperpendiculartoeachothertorealizeadual-polarizednantenna.Thisnantennacanreceivethetwoincidentpolarizationsattwoseparategaplocationswithveryhighisolation.Theproposedstructurecanbeusedinseveralenergyharvestingapplications,suchasscavengingtheinfraredheatfromtheEarthandotherhotobjects,inadditiontoopticalcommunications.

简介：Today,e-mailhasbecomepartofcommunication,andisthecoreofinformationpublicationamongtheenterprises.Soastocanreachtherapid,low-costandreliableemaildemand,manycompaniesandindividualsusetheserviceofferedbyLinuxasthesolutionsatisfyingthedemands.SondmailisafreewarewhichactsasmailserverinLinux.Theage-olddevelopmenthistoryofSendmailensuresitstransplantability,stabilityandthetechniquesupport.

简介：Ａ　Ｎｅｗ　Ｅ３　Ｔｒａｎｓｉｔｉｏｎ　ｆｒｏｍ　９＋　Ｉｓｏｍｅｒ　ｉｎ　１４４Ｐｍ　ＮｕｃｌｅｕｓＡＮｅｗＥ３Ｔｒａｎｓｉｔｉｏｎｆｒｏｍ９＋Ｉｓｏｍｅｒｉｎ１４４ＰｍＮｕｃｌｅｕｓ￥ＺｈａｎｇＹｕｈｕ；Ｙ．Ｇｏｎｏ；ＺｈａｏＱｉｎｚ...

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简介：Wepropose,inthispaper,touseseveralmultivariateanalysismethodeandanewkindofvariablestoseparatebetweenfourclassesofeventsproducedatLEP2:theeventswith2jets,3jets,4jetsandthosehavingamoreabundantjettopology(njets,n>4)Neuralnetworkhaveproventhemselvestobemoreefficientclassifierthantheothertechniques.Theefficienciesandpuritiesachievedwiththeoptimizedneuralnetworkareinaverage1to7%higherthanthoseobtaindwiththeothermethods.

简介：InfluenceoftheeffectivefermionhexadecapoleforcenewlyincorporatedinamicroscopicsdgIBM-1onspectra,reducedE2andE4transitionmatrixelements(T(E2)sandT(E4)s)intheeven-evenplatinumisotopes(A=192,194,196,198)isinvestigatedintermsofnumericalcalculations.ItisfoundthattheintroducedinteractioncausesonlylimitedmodificationtothespectrumandT(E2)s,apartfromafewexceptions.However,itplaysanessentialroleindescribingE4transitions.Thusinthecasethattheinteractionisincorporatedwithcertainstrength,areasonabledescriptionofalltheE4transitionsintheplatinumisotopesisreachedinthemicroscopicsdgIBM-1incomparingbothtoexperimentaldataandtheresultscalculatedinphenomenologicalbosonmodel.``

简介：飞秒激光器频率梳促成了度量衡领域的许多进步，例如从光原子钟到对太阳系外行星的研究。麻省理工学院的研究人员已确定这些光学脉冲序列可精确到阿秒（as）级。

简介：本文介绍应用多媒体创作工具和三维动画设计软件,制作多媒体课件的方法,介绍了课件制作的关键技术.课件内容可用于光学工程、光信息科学技术、电子科学技术类专业高年级学生的实验教学.