简介：当前学生解题遇到的困惑是：“看看容易,解解费力,想想有趣,功夫还差一点点”.面对试题命制的背景源,提出了教师在进行教材倒习题教学要有反思提炼、穿越组合、探究开发三意识,充分挖掘教材中例习题的内在“潜能”及教学价值.

简介：本文尝试以大葱（长葱白品种）为实验材料,探讨其作为观察叶绿体、线粒体材料的可行性.结果表明：大葱的葱叶可用于观察叶绿体,鳞茎的鳞片叶可用于线粒体观察,且具有实验材料供应充足、撕取表皮操作难度低、观察效果好等优点.因此大葱也是观察叶绿体和线粒体的理想材料.

简介：Onassumingthatweaksubstructurehasadynamicswhichissimilartoquantumchromodynamicsbutmuchstronger,weconcludethatunquenchingisindispensableforpredictionsonthespectrumofweak-substructureresonances[1].

简介：Wereportonanunexplainedhighstatisticssignalthatmayindicatetheexistenceofasuperlightscalarboson[1].Thequestionwhetherthereexistsa(scalar)bosonwithamassofabout38MeVdoesnotdependexclusivelyontheexistenceofaresonance-likestructure(Fig.1)intheexperimentaldataofRef.[2],yetitisatpresenttheclearestsignalwehavefoundinmanyexperiments.

简介：Wecommunicatemanydifficultiesthatweencounterwhenattemptingtopinpointacommonoriginfortheseveralobservedanomalies[1;2]orassessingtheirtensionwithexistingexclusionlimits.Theseincludesystematicsaffectingtheoperationofthedetectors,ourknowledgeoftheirresponse,astrophysicaluncertainties,andthebroadrangeofparticlecouplingsthatcanmediatetheinteractionwithadetectortarget.Theinterestingastrophysicalevidence[2]thatmotivatesasearchfordark-photonandfocusesourattentiononaHiddenValleysmodelwithaGeV-scaledarksectorthatproducesexcitingsignatures.Resultsfromtherecentundergroundexperiments[1]arealsoconsidered.

简介：TheGroupofNuclearStructureResearchatIMPhasdevotedmuchefforttothelifetimemeasurementsoflowlyingexcitedstatesvia??fasttimingcoincidence.Twoexperimentswereperformedin2015attheradioactivebeamlineRIBLL[1]andgas-filledrecoilseparatorSHANS[2].

简介：Usingbi-spinorfieldswewritethepseudo-scalarandbi-spinorfieldsthatarecharacterizedbythefieldfunctionsofcoordinatesofseveralparticles,namelymulti-particlefields.Byapplyingthequantizationproceduretothesemulti-particlefields,hadroniccreationandannihilationoperatorshavebeenobtained.

简介：AcarefulanalysisoftheAME2012[1]databaseintheframeworkoftheinverseproblemsusingthedynamicautoregularizationmethodor,moreprecisely,theREGNprogram[2],whichistheconstructivedevelopmentoftheTikhonovregularizationmethod[3],revealsphenomenologicalfunctionalfeaturesofpreviouslyunknownparametersoftheBethe-Weizs¨acker(BW)massformula.

简介：Veryrecently,theBelleandBESIIIexperimentsobservedanewcharmonium-likestateX(3823),whichisagoodcandidatefortheD-wavecharmonium(13D2).BecausetheX(3823)isjustneartheDˉDthreshold,thedecayX(3823)!J=+??canbeagoldenchanneltotestthesignificanceofcoupled-channeleffects.Inthiswork[1],thisdecayisconsideredincludingboththehidden-charmdipionandtheusualquantumchromodynamicsmultipoleexpansion(QCDME)contributions.

简介：UsingthestandardtruncatedPainlevexpansion,theresidualsymmetryofthe(2+1)-dimensionalmodifieddispersivewater-wavesystemislocalizedintheproperlyprolongedsystemwiththeLiepointsymmetryvector.Somedifferenttransformationinvariancesarederivedbyutilizingtheobtainedsymmetries.ThesymmetriesofthesystemarealsoderivedthroughtheClarkson-Kruskaldirectmethod,andseveraltypesofexplicitreductionsolutionsrelatetothetrigonometricorthehyperbolicfunctionsareobtained.Finally,somespecialsolitonsaredepictedfromoneofthesolutions.

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简介：Thermodynamicpropertiesandphasediagramsofamixedspin-(1,2)Isingferrimagneticsystemwithsingleionanisotropyonhexagonalnanowirearestudiedbyusingeffective-fieldtheorywithcorrelations.Thesusceptibility,internalenergyandspecificheatofthesystemarenumericallyexaminedandsomeinterestingphenomenainthesequantitiesarefound.TheeffectoftheHamiltonianparametersonphasediagramsareexaminedindetail.Besidessecond-orderphasetransition,linesoffirst-ordertransitionandtricriticalpointsarefound.Inparticular,wefoundthatforsomenegativevaluesofsingle-ionanisotropies,thereexistfirst-orderphasetransitions.

简介：随着信息技术的革新与换代越来越快,更多的高新技术与新兴事物不断涌现,红外传感器技术作为近年来发展最快的技术之一,目前已广泛应用于航空航天、天文、气象、军事、工业和民用等众多领域,起着不可替代的重要作用。

简介：TheenigmaticchargedstatesZc(3900),Zc(4020),Zc(4050),Zb(10610),andZb(10650)arestudiedwithinacoupled-channelSchr¨odingermodel[1],whereradiallyexcitedquark-antiquark(qˉq)pairs,withthesameangularmomentaandisospinasthea1(1260)andb1(1235),arestronglycoupledtotheirOkubo-Zweig-Iizuka-allowedde-caychannelsDˉD+ˉDDandDˉD,orBˉB+ˉBBandBˉB,inSandD-wave.Poles,matchingtheexperimentalmassandwidthofalltheabovestates,arefoundbyvaryingonlytwofreeparameters.In

简介：一次函数是初中学生学习函数的第一个阶段,其基础性和重要性不言而喻,中考对函数的考查属重头戏,对一次函数的考查十分关注.通过一题多变把一次函数的有关基础知识横纵向联系,把以前学习的方程（组）、不等式（组）等统一起来认识,逐步达到新旧知识的融会贯通,从而进一步体会一次函数的重要性,通过一题多变能更全面、更快捷地掌握知识和技能.

简介：Weproposeandexperimentallydemonstratecompacton-chip1×2wavelengthselectiveswitches(WSSs)basedonsiliconmicroringresonators(MRRs)withnestedpairsofsubrings(NPSs).OwingtotheresonancesplittinginducedbytheinnerNPSs,theproposeddevicesarecapableofperformingselectivechannelroutingatcertainresonancewavelengthsoftheouterMRRs.SystemdemonstrationofdynamicchannelroutingusingfabricateddeviceswithoneandtwoNPSsiscarriedoutfor10Gb∕snon-return-to-zerosignal.Theexperimentalresultsverifytheeffectivenessofthefabricateddevicesascompacton-chipWSSs.

简介：本文对普通力学中一个追赶碰撞问题进行了详细的求解和讨论。分析了A与B两个质点作非完全弹性碰撞发生多次碰撞的条件,得到了两质点至少发生四次碰撞的条件。

简介：建立了非线性热力学模型,定性分析了外加应力和外加温度对外延生长在正交基底上的Pb（Zr1-xTix）O3（PZT）薄膜相变的影响。在外力场下,固定其中一个方向失配应变e1=0.005,模拟得到了不同组分的PZT薄膜的失配应变一外加应力的相图。研究发现,随着Ti组分的减少,出现了新相正交a1c相和四方相a1相,且新相区域也会随Ti组分的不同而变化。在外加拉应力下,c相是薄膜较易出现的相,而在外加压应力下薄膜易处于a1a2相。在不同温度场下,模拟非等轴失配应变的PZT薄膜得到不同组分的PZT薄膜的失配应变一外加温度相图。当组分x≤0.7时,相图中出现了正交a1c相,由于非等轴失配应变的存在,使得从顺电相向r相发生相变的过程中,多出了正交a1a2相;同时另一新的四方a1相也出现在沿失配应变正方向e2被拉伸的区域。随着Ti组分的增加,单斜r相的面积缩小且位置下移。之前存在的四相点也变为了三相点,而正交相a1a2相则向相图的中心位置移动。模拟结果对研究外场下铁电薄膜微器件的性能变化具有一定的指导意义。

简介：给出了一种利用BP神经网络从中子活化测量数据中直接求解1MeV等效中子注量的新方法。该方法选用了含两层隐藏层的BP神经网络,并围绕先验谱建立输入输出集合,对网络进行训练、检验和测试,最终形成含20个BP神经网络的网络群。该BP神经网络群可实现在输入测量活化率数据后,直接输出相应的1MeV等效中子注量。利用该方法求解了西安脉冲堆大空间中子辐照实验平台内的1MeV等效中子注量。与实测中子能谱计算的1MeV等效中子注量结果对比,二者偏差小于6.6%。

简介：在定理教学中，创设适当情境，让学生发现问题，提出问题进行研究，历经猜想、探究、失败、反思、再探究、发现，类似于科学家进行科学研究的过程，可极大地调动学生学习的主动性和创造性，从而达到发展学生思维能力的目的．