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21 个结果
  • 简介:Thisarticlereviewsthebackgroundandproblemsintheteachingofintensivereading(IR)tothestudentswithnon-EnglishmajorsandproposessomeactivitiesforimprovingtheteachingandlearningprocessoftheIRclassroom.Itisexpectedthatwithsomeapplicableandeffectiveactivities,theteachercanhelpstudentsreadactivelyandgrowintoeffectiveandindependentreaders.

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  • 简介:INTRODUCTIONThedisease,damageorlossoftissueandorgancanseriouslyaffectthehumanlife,evenleadstomaimedordeath,thatitshouldnotbeignored.Todate,autograftsandallograftstransplantationarethemostusuallyusedmethodstorepairdefectsoftissuesandorgans.

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  • 简介:Communityforestryisaforestryactivitywithlocalfarmersasthemainbody,andincreasinglocalfarmers’economicreturnsandimprovingcommunityecologicalenvironmentaspurposes.Itsbasicdifferencewithforestryactivitywithgovernmentofficialsasthemainbodyandmodernengineeringtechnologyasmeansandecological-environmentbene

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  • 简介:Usingsteppatternmatchtechnologywithvariationalresolutioncanrecognizethepositionandorientationoftheweldseamintheimage.Accordingtousingtheimagesegmentationmethodbasedonpatternmatch,notonlyadvancedthespeedandanti-jammingcapability,butalsocapturedtheedgeinformationoftheweldseamandtheedgeoftheworkpiece,andtheimagecoordinateoftheinitialweldingpositioncanbeobtained.Thematrixforhand-eyerelationshipoftherobotcanbecalculatedbyadoptingtherapidcalculationmethod.Accordingtothedepthcalculatingprinciplewiththespecialpointmatchingusingbinocularstereovision,theinitialweldingpositioncanbeconfirmedbycalculatingthemiddlepointoftheperpendicularlineoftworadialsinthespace,andthefunctiontoguidetheweldingrobottotheinitialweldingpositioncanberealized.

  • 标签: 焊接技术 程序控制 立体观察 导管
  • 简介:Thereportofthe19thCommunistPartyofChinaNationalCongressisadocumentwithanimportanthistoricalpositionanduniquehistoriccontributioninthehistoryofthePeople’sRepublicofChinaandthegreatrejuvenationoftheChinesenation.Thereportcanberoughlydividedintotwoparts:generalprinciplesandsubstantialcontent.Thegeneralprinciplescomprisefourissues,whicharejudgmentof

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  • 简介:DuringtheconstructionoftheguidingdikeintheYangtzeEstuary,someofthecaissonstructuressankintothesoilfor1~5morslidabout20mawayfromtheoriginalplacewhenastrongstormattackedthisarea.Dynamictriaxialtestswerecarriedouttosimulatethebehavioroffoundationsoilsunderwaveloading.Thetestresultsshowthattheexcessivesettlementandlateralmovementofthecaissonsareduetotheweakeningofthesoftclaystrengthduringthestrongstorm.Thetestresultsalsoshowthattheabilityofthesoftclaytoresistthewaveforcewillbegreatlyincreasedwhenthesoftsoilsamplesaresuitablyimproved.Basedonthetestresults,animprovementmethodcombiningverticaldrainswithsurchargeloadingwasproposedtostrengthenthefoundationsoil.Ontheimprovedsoilfoundation,thedikehasbeenreconstructedandundergoneseveralstrongstormswithoutanydamage.Afiniteelementapproachhasbeendevelopedforanalyzingthesettlementandstabilityofthedikeundertheactionofstrongstorm.

  • 标签: 软粘土 强度弱化 堤防 动力三轴实验 有限元分析
  • 简介:这篇论文集中于第三个作者在上海论坛给在上的演讲的部分工业并且应用数学(上海2006)。它与进化的一个周期的答案的存在有关是变化不平等。途径基于指导功能的方法。

  • 标签: 变分不等式 周期解 进化 应用数学 上海
  • 简介:Inthisreport,wepresentasimulatedresultontheion-massindependenceoftheguidedtransmission,whichisinagreementwiththepreviousexperimentalresults[1].Inordertosearchtheinuenceoftheionmassonguidedtransmission,variousspeciesofionsusedasprojectilesinsimulations.Fig.1showsthetransmissionfractionsforNe7+,Ar7+,Kr7+,andXe7+ions.Thesedatawereacquiredfortiltangleof2inenergyof7keV.Itisseenthatallofionfractionsgraduallyrisesafteratimedelay,andnallyreachstable.

  • 标签: INDEPENDENCE GUIDING Insulating
  • 简介:Wereportonasystematicexperimentalstudyonthefluorescencespectraproducedfromafemtosecondlaserfilamentinairunderahighelectricfield.Theelectricfieldalonewasstrongenoughtocreatecoronadischarge(CD).Fluorescencespectrafromneutralandionicairmoleculesweremeasuredandcomparedwithpurehigh-voltageCDandpurelaserfilamentation(FIL).Amongthem,highelectricfieldassistedlaserFILproducednitrogenfluorescencemoreefficientlythaneitherpureCDorpureFILprocesses.Thenonlinearenhancementoffluorescencefromtheinteractionofthelaserfilamentandcoronadischargingelectricfieldresultedinamoreefficientionizationalongthelaserfilamentzone,whichwasconfirmedbythespectroscopicmeasurementofbothionization-inducedfluorescenceandplasma-scattered800nmlaserpulses.Thisisbelievedtobethekeyprecursorprocessforfilament-guideddischarge.

  • 标签: FEMTOSECOND LASER FILAMENTATION FILAMENT induced fluorescence
  • 简介:Flaviviruses包括约70个密切相关的RNA病毒。这些包括几忍受蚊子的病原体,例如黄发烧病毒(YFV),登革热病毒(DENV),和日本脑炎病毒(JEV),它能引起重要人的疾病并且因此具有大医药重要性。对YFV和JEV的疫苗为decades;在人成功地被使用了;然而,一支DENV疫苗的发展遇到了可观的障碍。这里,我们考察疫苗对YFV得到提供一些卓见进一支保护的DENV疫苗的发展的保护的有免疫力的回答。

  • 标签: 乙脑疫苗 登革热 热病 RNA病毒 应用 日本脑炎病毒
  • 简介:Withtheincreasingnumberoflaserbeams,themaindifficultyinarrangingbeamguidingsystems(BGSs)involvesdeterminingthecorrespondingrelationshipsbetweentheoutputandinputportstorealizetheidentifiedlightpathlengthofallbeams.Giventhebasicconstraintsofgeometricarrangement,aBGSmodelisestablished,andabase-linealgorithmisproposedtoaddressthedifficultymentionedabove.Boundaryconditionsoftargetareaandtargetchamberarediscussedtoincreasethenumberoflaserbeams,andamaximumvalueexistsforaspecifictargetarea.Finally,thecompatibilityofacylindricalhohlraumtargetchamberwithasphericalhohlraumisanalyzed,andamoveablefinalopticsassemblyisproposedtoexecutetheswitchbetweenthetwodifferenttargets.

  • 标签: BEAM GUIDING SYSTEM laser DRIVERS spherical
  • 简介:金属nanostructures展览专辑光回声模式在材料从传导性的电子的subwavelength监禁发源。这些回声模式在光学和察觉到的申请由于他们的申请潜力代表一个强壮的研究焦点。在这短评论,我们这块地里的组的最近的成就被加亮。先进金属性的nanostructures的湿化学的途径合成将被介绍,他们由电场的准确的放和操作被显示出。下次,为小分子的察觉的这些nanostructures的申请将在几个例子被描述。另外,金属nanostructures能被用于亚波长光集中并且为有效精力联合进聚合物链,这将被显示出。

  • 标签: 遥感应用 纳米结构 生物传感 等离子 开发 能源