简介：摘要：随着社会多元文化的深入，国际交往日趋广泛，语音在英语教学中地位越发凸显，对教师和学生来说无疑是一大挑战。尤其是小学阶段，语音教学的内容、方式直接影响着学生的学习主动性和积极性，因此如何进行小学英语语音教学，通过哪些途径开展语音教学，对不同学段的小学生如何有效开展语音教学已成为当前小学英语语音教学中备受关注的课题。

简介：Thispaperpresentsacoupleddynamicresponseanalysisofamulti-columntension-leg-typefloatingwindturbine(WindStarTLPsystem)undernormaloperationandparkedconditions.Wind-onlyloadcases,wave-onlyloadcasesandcombinedwindandwaveloadcaseswereanalyzedseparatelyfortheWindStarTLPsystemtoidentifythedominantexcitationloads.ComparisonsbetweenanNRELoffshore5-MWbaselinewindturbineinstalledonlandandtheWindStarTLPsystemwereperformed.Statisticsofselectedresponsevariablesinspecifieddesignloadcases(DLCs)wereobtainedandanalyzed.ItisfoundthattheproposedWindStarTLPsystemhassmalldynamicresponsestoenvironmentalloadsanditthushasalmostthesamemeangeneratorpoweroutputunderoperatingconditionsastheland-basedsystem.Thetensionmooringsystemhasasufficientsafetyfactor,andtheminimumtendontensionisalwayspositiveinallselectedDLCs.Theratioofultimateloadofthetowerbasefore-aftbendingmomentfortheWindStarTLPsystemversustheland-basedsystemcanbeashighas1.9inalloftheDLCsconsidered.TheseresultswillhelpelucidatethedynamiccharacteristicsoftheproposedWindStarTLPsystem,identifythedifferenceinloadeffectbetweenitandland-basedsystems,andthusmakerelevantmodificationstotheinitialdesignfortheWindStarTLPsystem.

简介：

简介：在现在的学习，双楔机翼模型的空气动力学的特征被把吃惊试管用作一条断断续续的风隧道在接近音速的流动调查。司机和吃惊试管的驾驶气体是干燥空气。两倍楔的机翼模型有58公里的跨度，75公里和它的最大的厚度是的弦长度c=7.5公里。双楔机翼模型的顶从前缘位于35%弦长度。马赫数字从0.80～0.88的热气体的范围，和雷纳兹数字基于弦长度是3.11脳105锝?3.49脳105分别地。流动可视化被能设想三个维的流动领域的锋利的集中schlieren方法执行。结果证明现在的系统能设想比以前的系统清楚的接近音速的flowfield，并且冲击波在测试节跨度的中心介绍是设想的关键词冲击波-schlieren方法-接近音速的流动-两倍楔-机翼模型CLC数字V211.7

简介：LetT(C(p,1,q))betbenumberofspanningtreesofcirculantgraphC(p,1,q).InthisnoteweshowthatT(C(p+1,1,q))/T(C(p,1,q))→2，p→+∞.

简介：Theeffectsofthemagneticfieldonthevalencebondpropertyofthedouble-quantum-dotmoleculearenumericallystudiedbythefiniteelementmethodandperturbationapproachbecauseoftheabsenceofcylindricalsymmetryinthehorizontallycoupleddots.Thecalculationresultsshowthattheenergyvalueofthegroundstatechangesdifferentlyfromthatofthefirstexcitedstatewithincreasingmagneticfieldstrength,andtheycrossunderacertainmagneticfield.Theincreasingmagneticfieldmakesthecovalentbondstatechangeintoanionicbondstate,whichagreesqualitativelywithexperimentalresultsandandmakesionicbondstatesremain.Theoscillatorstrengthoftransitionbetweencovalentbondstatesdecreasesdistinctlywiththeincreasingmagneticfieldstrength,whenthemoleculeisirradiatedbypolarizedlight.Suchaphenomenonispossiblyusefulforactualapplications.

简介：我们学习与一个浸透的非线性的双井潜力在一枚旋转戒指套住的基本模式。这个模型，它基于非线性的Schr?dinger方程，能以光在一根扭曲的波导管子中被构造繁殖，或在在旋转-out-of-phase的联合下面装进一个toroidal陷井的Bose爱因斯坦冷凝物(BEC)，线性潜在、非线性的pseudopotential借助于旋转导致了光地和Feshbach回声。基本模式的三种类型在这个模型，对称的模型和其它被识别二不对称。在不同模式之间的模式和转变的形状和稳定性在第一个旋转Brillouin地区被调查。一个类似的模型使用了克尔媒介到造它的非线性的潜力，但是我们用浸透的非线性的媒介代替它。模型展出不仅对称碎，而且对称恢复。不稳定的不对称的模式的一种特定的类型也被发现，并且不稳定的不对称的模式的进化展示在二口线性井之间的Josephson摆动。由把模型看作一个BEC系统的一种配置，扎根的州的模式在这三种类型之中被识别，它在陷井附近描绘BEC原子的特定的分布。

简介：

简介：不知道从什么时候起，各位体育粉丝觉得光看这星那星一颗颗孤独地闪不够劲了，变得爱看成群结队一拥而上的，甭管当事人喜不喜欢，什么“梦幻组合”、“三剑客”、“四大天王”甚至“七匹狼”都陆陆续续闪亮登场。小编们不知什么时候也沾染上了这习气，灵光一闪推出这个“XX组合”专题，幸好和“七匹狼”什么的比起来还算收敛，还只是成双成对地上……不过也是．整天吃饭就一个菜也腻味，喜不喜欢，就当换换口味吧!下面先看我们连环致响炮的第一发：

简介：Becauseofitsgoodconditionwithmechanics,logarithmicspiraldoublecurvearchbamhasbeenwidelyusedinthepracticalengineering.Theintroductionofanewmethodinhowtodividetransversejointinarchdamwillbegivenandthefurtherresearchofitscalculationhasbeendone.TheC++isusedinelectronicprocedureandthe3DsimulationhasbeenfinishedwithAutoCAD,whichwillprovidetheobjectmodelforcomputersimulationofthearchdamandthedivisionoffiniteelementmesh.Meanwhile,thismethodindividingthetransversejointinarchdamalsocanbetakenasthecalculatedbasisforthedesignandcalculationofarchdam,constructionloftingandthecalculationoftheworkamount.

简介：Plasmonicgratingstructureshavebeenshowneffectiveatincreasingnear-fieldopticalenhancement.Adoublewidthplasmonicgratingdesignisintroduced,whereeachperiodhastwoalternatingmetalwidthsseparatedbyananogap.Withthisnewdesign,analysishasshownthatplasmonicresonancescouplebetweeneachmetalsection,resultinginevengreateropticalenhancementcomparedwithsingle-widthgratings.Thegeometrythatgivesthegreatestopticalenhancementhasbeendeterminedwithacomputationalmodel.Thisworkdemonstratesthattheincreasedenhancementisduetohybridizedmodesthatcouplebetweenthetwogratingsegments.

简介：多层的铱涂层在钨上被生产由双发光的碳化物底层血浆过程。作为比较，单层也被生产。微观结构和形态学用扫描电子显微镜学被观察。谷物取向和阶段用X光检查衍射被决定。涂层的剩余压力被学习旁边看一眼的发生X光检查衍射。涂层的粘合剂力量被一个擦伤测试者测量。结果显示出那单层并且多层有一个多晶的阶段与一强壮(110)思考。涂层没有分层的证据有优秀粘附。单层的粘合剂力量并且多层分别地是大约50和43N。在底层和层之间的界面的反应发生了，一个新WIr阶段由于高温度的免职过程被发现。在单层的剩余压力并且多层分别地是-1.6和-1.1GPa。

简介：一只新奇侧面的双门通道领域效果晶体管(DG-TFET)被学习，它的性能被二维的设备模拟与代码ISE介绍。Theresult证明这只新通道晶体管允许在60mV/dec下面的更陡峭的次于最低限度的秋千，超级低供应电压(在V-DD<合用0.3V)并且rail-to-rail逻辑(在排水管来源电压V-DS=的重要在状态上电流50mV)为好攻击的技术，high-k/metal的可获得性的假设与相等的门氧化物厚度传输结束字符=叠0.24nm和工作工作差别4.5材料的eV。

简介：TheDonnelltheoryofshellwasappliedtodescribeshellmotion.Theinnerandoutershellswerestiffenedbytransversecomponents.Usingdeformationharmoniousconditionsoftheinterface,theeffectsofstiffenersweretreatedasreverseforcesandmomentsonthedoublecylindricalshell.Intheacousticfieldproducedbyvibrationandsoundradiationofthedoubleshell,thestructuredynamicequation,Helmholtzequationinthefluidfieldandthecontinuityconditionsofthesurfaceoffluid-structurecomposethevibrationequationcoupledbythesound-fluid-structure.Theextractofacousticpressurecomesdowntotheextractofcouplingvibrationequation.Thenearfieldacousticpressurecanbesolveddirectlybycomplicatedcalculationalmethods.

简介：

简介：Activatedcarbons(ACs)withawiderangeofsurfaceareasweremadefrompetroleumcokebymeansofKOHactivation.Theelectrochemicalcharacterizationwascarriedoutforseveralactivatedcarbonsusedaspolarizableelectrodesofelectricdouble-layercapacitors(EDLCs)inanaqueouselectrolyticsolution.Theporousstructuresandelectrochemicaldouble-layercapacitanceoftheactivatedcarbonswereinvestigatedbyvirtueofnitrogengasadsorptionandconstantcurrentcycling(CCC)methods.Therelationshipamongthesurfacearea.porevolumeoftheactivatedcarbonsandspecificdouble-layercapacitancewasdiscussed.ItwasfoundthatthespecificcapacitanceofACsincreasedlinearlywiththeincreaseofsurfacearea.Thepresenceofmesoporesintheactivatedcarbonswithveryhighsurfacearea(>2000m^2/g)wasnotveryeffectiveforthemtobeusedasEDLCs.Theinfluenceofchemicalcharacteristicsoftheactivatedcarbonsonthedoublelayerformationcouldbeconsideredtobenegligible.

简介：Wehaveoptimizedtheinputpulsewidthandinjectiontimetoachievethehighestpossibleoutputpulseenergyinadouble-passlaseramplifierusingtwoNd:YAGrods.Forthispurpose,wehaveextendedtheFrantz–Nodvikequationbysimultaneouslyincludingbothspontaneousemissionandpumpenergyvariation.Theeffectivepumpenergyoftheflashlampwas8.84Jforeachgainmedium.Theenergyof1Jcouldbeamplifiedtoanoutputenergyof12.17Jwiththemaximumachievedextractionefficiencyof63.18%whenaninputpulsehavingapulsewidthof168μsissent10μsaftertheabsorbedpumpenergybecomesthemaximumvalue.

简介：

简介：AccumulatingevidencehasdemonstratedthatregulatoryT(Treg)cellsplayanimportantroleinthemaintenanceofimmunologicself-toleranceandindown-regulatingvariousimmuneresponses.Thus,therehasrecentlybeenanincreasinginterestinstudyingthebiologyofTregcellsaswellastheirpotentialapplicationintreatingimmunediseases.ManytypesofTregcellsubsetshavebeenreportedinavarietyofdiseasemodels.Amongthesesubsets,αβ-TCR+CD3+CD4-CD8-doublenegative(DN)TregcellsaredefinedbytheircapabilityofinhibitingimmuneresponsesviadirectlykillingeffectorTcellsinanantigenspecificfashion.Furthermore,DNTregcellshavebeenshowntodevelopregulatoryactivityafterencounteringspecificantigens,partiallymediatedbytheacquisitionofMHC-peptidecomplexesfromantigenpresentingcells(APCs).ThepresentationofacquiredalloantigensonDNTcellsallowsforthespecificinteractionbetweenDNTregcellsandalloantigenreactiveeffectorTcells.OncetheDNTregandtargetcellshavecomeintocontact,killingisthenmediatedbyFas/Fas-ligandinteractions,andperhapsthroughotherunidentifiedpathways.Furthercharacterizationofthefunctions,molecularexpressionandmechanismsofactivationofDNTregcellswillhelpinthedevelopmentofnoveltherapiestoinduceantigenspecifictolerancetoselfandforeignantigens.Cellular&MolecularImmunology.2004;1(5):328-335.

简介：