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  • 简介:3个不同的年龄20、30、40,不同的爱好,不同的经历,却在同样的城市,同样为了自己的灵感,选择了同样的maneger生活。

  • 标签: 年龄层 生活 经历 爱好
  • 简介:Broadband(1.6–18THz)terahertztime-domainspectroscopy(THz-TDS)andtime-resolvedterahertzspectroscopy(TRTS)wereperformedona54μmthickchalcogenideglass(As30Se30Te40)samplewithatwo-colorlaser-inducedairplasmaTHzsystemintransmissionandreflectionmodes,respectively.Twoabsorptionbandsat2–3and5–8THzwereobserved.TRTSrevealsanultrafastrelaxationprocessofthephotoinducedcarrierresponse,welldescribedbyarateequationmodelwithafiniteconcentrationofmid-bandgaptrapstatesforself-trappedexcitons.ThephotoinducedconductivitycanbewelldescribedbytheDrude–Smithconductivitymodelwithacarrierscatteringtimeof12–17fs,andweobservesignificantcarrierlocalizationeffects.Afastrefractiveindexchangewasobserved100fsbeforetheconductivityreacheditsmaximum,with2ordersofmagnitudelargeramplitudethanexpectedfortheopticallyinducedTHzKerreffect,indicatingthatfreecarriersareresponsibleforthetransientindexchange.

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  • 简介:有人说“问题是数学的心脏”、“问题解决是数学教学的核心”,这是数学题重要性的体现.数学题的特征决定了它的功能,进而决定了它的教育价值.作为数学教师,主动接受建构主义教学理论的指导,研究数学开放题,构建数学开放题及其教学模式并用之于数学教学是对学生进行素质教育的一条有效途径.笔者在教学实践中对数学开放题进行了探索,下面就从四个方面谈谈自己的看法:

  • 标签: 数学开放题 建构主义教学理论 数学教学 数学教师 教育价值 教学实践
  • 简介:TheGroupofEnergyMaterials(GEM)inIMPisengagedintheirradiationresponseofmaterialscandidatetoadvancednuclearenergysystems(GenIV,fusionreactors).Themajorprogressofresearchinourgroupin2016isintheirradiationhardening/embrittlementofoxide-dispersion-strengthened(ODS)ferriticsteelsandVanadiumalloys,andinthemechanismsunderlyingdamageproductioninsiliconcarbide(SiC)fibers.Abriefdescriptionisgivenasfollows.1.EffectoftheoxidenanoparticlesontheirradiationhardeningofODSferriticsteelsTheinfluenceofoxidenanoparticlesontheirradiationresistanceofODSferriticsteelsisacrucialissuefortheupgradeofODSsteels.

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  • 简介:Heavyionbeamsaregenerallyrecognizedasoneofpowerfulmutagensinplantbreedingtogeneratenewmutantswithidealorusefulagronomiccharacters[1].12C6+ionbeams(80MeV/u)acceleratedbyHeavyIonResearchFacilityinLanzhou(HIRFL)wereusedtoirradiatewheatsamples,oneofthemajorwheatvarietiesinQinghaiprovince,namedGaoyuan448.Theradiationdosesrangedfrom10to200Gy.Theirradiatedsamples,controls,andanothermajorwheatvarietynamedAbowereplantedinfarmlocatinginLeducountyofQinghaiprovincein2014.

  • 标签: MUTATION BREEDING IRRADIATED
  • 简介:新课程理念下的教育教学改革已全面启动,改革的主阵地在课堂,出路在优化课程教学过程。数学开放式教学的探讨,正是优化课堂教学过程的有意尝试。只有开放学习环境,才能培养学生创新意识;只有开放学习方式,才能促进学生自主求知;只有开放学习评价,才能让学生享受成功。

  • 标签: 数学 开放 教学 探讨
  • 简介:Study on IMF Emission in 30 MeV/u 40Ar Induced ReattionsStudyonIMFEmissionin30MeV/u40ArInducedReattions¥ZhuYongtai;XuHus...

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  • 简介:ThepropertiesofPbn(n=2―30)clustersincludingbindingenergies,seconddifferencesinenergy,andHOMO-LUMOgaps,especiallyfragmentationenergiesandionizationpotentials,havebeenstudiedbyabinitiocalculation.ThemainfragmentationproductsofPbn+areshowntobePb+Pbn-1+forn≤14andtwosmallclusterfragmentsforlargeroneswithn>14.ThePb13+appearsfrequentlyastheproductsinthefragmentationsoflargeclusters.Also,thecalculatedionizationpotentialsoftheclustersareconsistentwiththeexperimentdata.

  • 标签: 电离势 碎裂 集群计算 HOMO LUMO 从头计算
  • 简介:Veryrecently,theBelleandBESIIIexperimentsobservedanewcharmonium-likestateX(3823),whichisagoodcandidatefortheD-wavecharmonium(13D2).BecausetheX(3823)isjustneartheDˉDthreshold,thedecayX(3823)!J=+??canbeagoldenchanneltotestthesignificanceofcoupled-channeleffects.Inthiswork[1],thisdecayisconsideredincludingboththehidden-charmdipionandtheusualquantumchromodynamicsmultipoleexpansion(QCDME)contributions.

  • 标签: IDENTIFY COUPLED-CHANNEL EFFECTS
  • 简介:从四个方面分析了《大学物理实验》在线开放课程建设的意义,并从六个方面探讨了《大学物理实验》在线开放课程的实践情况。这对于其他课程进行“在线开放课程”建设是有一定的参考意义的。

  • 标签: 大学物理实验 在线开放课程 慕课 建设 应用