简介：Unsteadyfluidflowsandlevelfluctuationsinathinslabcontinuouscastingmouldhavesignificantinfluenceonproductquality.Inthisstudy,thephenomenaconcerningtransientflowfeaturesandfreesurfacemotionswereanalyzedbymeansofthelargeeddysimulation(LES)softwarewiththesmagorinskySGSmodel-VisualCast(VCast)II,wheretheSimpleralgorithmonabody-fittedmeshwasusedtoresolvegoverningequations.Aseriesofwateranalogexperimentsonthefluidflowandthesurfacewaveinthemouldsofthinslabcontinuouscastingwerealsoperformed.Theresultsoffluidregions,middleofvortexandlevelfluctuationfromdigitalsimulationswereidenticalwiththeresultsofthewateranalogexperiments.

简介：Thisstudyestablishedathree-dimensionalmathematicalmodeltodeterminethefluidflowinaslabcontinuouscastingmoldunderanelectromagneticstirringforce.Theflowstructureanddistributionwerestudiedwithrespecttodifferentcontinuouscastingparametersandstirringcurrent.Basedonthecalculationresults,themoldfluxentrapmentindexinfreesurfaceandvelocityuniformityindexwereusedtoevaluatetheflowfieldinthemold.Thetheoreticalbasisfortheoptimizationoftheflowfieldstructurewasprovided.Thestudyalsosuggestedanoptimizationmethodforelectromagneticstirringparameters.

简介：Thispaperdiscussestheneutrontransportequationinaslabwithgeneralizedreflectingboundaryconditions.BymeansofthepositiveC0-semigrouptheory,wehaveprovedthatthisproblemhasauniquenonnegativesolutionandfoundthespectralpropertyofthecorrespondingtransportoperator.Finallywegivetheasymptoticbehaviorofthesolutionforthisequation.

简介：ItisshownthataGaussianlightbeamtransmittingthroughaplanarthindielectricslabintheairundergoesfourdifferenteffects,i.e.lateralGoos–Hnchen-like(GHL)displacement,angulardeflection,widthmodificationandlongitudinalfocalshiftascomparedwiththeresultspredictedbygeometricaloptics.AccordingtotheTaylorexpansionoftheexponentoftransmissioncoefficientwhenexpressedasanexponentialform,thelateralGHLdisplacementandtheangulardeflectionarethefirst-ordereffectsandcanbenegativeorpositive.Thewidthmodificationandthelongitudinalfocalshiftarethesecond-ordereffectsandcanalsobepositiveornegative.Owingtothewaist-widthdependentterm,thenon-geometricaleffectsoftransmittedbeamarenotidenticalwiththenon-speculareffectsofreflectedbeam.Theconditionsforthevalidityofthoseeffectsaresuggestedandnumericalsimulationsarealsogiven.

简介：Weinvestigatethediffractionoftheguidedmodesofadielectricslabwaveguideonasimpleintegratedstructureconsistingofasingledielectricridgeonthesurfaceofthewaveguide.Numericalsimulationsbasedonaperiodicrigorouscoupled-waveanalysisdemonstratetheexistenceofsharpresonantfeaturesandboundstatesinthecontinuum(BICs)inthereflectanceandtransmittancespectraoccurringattheobliqueincidenceofatransverseelectric(TE)-polarizedguidedmodeontheridge.Usingtheeffectiveindexmethod,weexplaintheresonancesbytheexcitationofcross-polarizedmodesoftheridge.FormationoftheBICsareconfirmedusingatheoreticalmodelbasedoncoupled-wavetheory.ThemodelsuggeststhattheBICsoccurduetothecouplingofquasi-TEandquasi-transverse-magneticmodesofthestructure.SimpleanalyticalexpressionsfortheangleofincidenceandtheridgewidthpredictingthelocationoftheBICsareobtained.Theexistenceofhigh-QresonancesandBICsenablesusingtheconsideredintegratedstructureforsensing,transformationofopticalsignals,andenhancingnonlinearlight–matterinteractions.DuetotheLorentzianlineshapeoftheresonancesneartheBICs,thestructureisalsopromisingforfilteringapplications.

简介：Ahigh-repetitionratemasteroscillatorpoweramplifierpumpedwithlaserdiodes(LDs)isreported.Aninjectionseedingsingle-frequencyelectro-opticalQ-switchedNd:YAGlaserisusedasanoscillator,andaconductivelycooledNd:YAGzigzagslabwithabounce-pumpedarchitectureisutilizedasapoweramplifier.Pulseenergiesofover800mJat1064nmand400mJat532nm,correspondingtoaveragepowersof200and100W,respectively,areachievedwitha12.6-nspulsewidthat250Hz.Outputfrequencyfluctuationsandsingle-frequencyoperationarefurthermonitored.Experimentalresultsrevealthattheproposedsystem,whichfeaturesasingle-passamplifiedconfiguration,isapromisingdesignforspace-basedapplications.

简介：MultipleresonantexcitationsofsurfaceplasmonsinagraphenestratifiedslabarerealizedbyOttoconfigurationatterahertzfrequencies.Theproposedgraphenestratifiedslabconsistsofalternatingdielectriclayersandgraphenesheets,andissandwichedbetweenaprismandanothersemi-infinitemedium.Opticalresponseandfielddistributionaredeterminedbythetransfermatrixmethodwiththesurfacecurrentdensityboundarycondition.Multipleresonantexcitationsappearontheangularreflectionspectrum,andareanalyzedtheoreticallyviathephase-matchingcondition.Furthermore,theeffectsofthesystemparametersareinvestigated.Amongthem,theFermilevelscantunethecorrespondingresonancesindependently.Theproposedconceptcanbeengineeredforpromisingapplications,includingangularselectiveormultiplexfilters,multiplechannelsensors,anddirectionaldeliveryofenergy.

简介：Aninversemethodispresentedforestimatingtheunknownboundaryincidentradiationheatfluxononesideofone-dimensionalsemitransparentplanarslabwithsemitransparentboundariesfromtheknowledgeoftheradiationintensitiesexitingfromtheotherside.Theinverseproblemissolvedusingconjugategradientmethodofminimizationbasedondiscreteordinatesmethod(DOM)ofradiativetransferequation.TheequationsofsensitivitycoefficientsarederivedandeasilysolvedbyDOM,withtheresultthatthecomplicatednumericaldifferentiationcommonlyusedinsolvingsensitivitycoefficientsisavoided.Theeffectsofanisotropicscattering,absorptioncoefficient,scatteringcoefficient,boundaryreflectivity,fluidtemperatureoutsidetheboundaries,convectionheattransfercoefficients,conductioncoefficientofsemitransparentmediaandslabthicknessontheaccuracyoftheinverseanalysisareinvestigated.Theresultsshowthattheboundaryincidentradiationheatfluxcanbeestimatedaccurately,evenwithnoisydata.

简介：受到移动的横着各向同性的浸透的土壤上的一条平板轨道的动态回答训练负担被一条半分析的途径调查。轨道模型被描述为一根上面的Euler横梁模仿栏杆和一根更低的Euler横梁为平板建模。在栏杆和平板之间的栏杆垫被弹簧和缓冲筒的连续的层代表。一系列点负担被提出描述动人的火车负担。轨道地面系统的管理方程用双Fourier变换被解决，并且在时间域的动态回答被反的Fourier变换获得。结果证明有高速度的火车负担将比更低的速度负担在横着各向同性的浸透的土壤产生更大的回答，并且特殊注意应该在扎根的表面的附近在毛孔压力上被给予。表面土壤层的各向异性的参数将心土层比那些在排水量和过量毛孔水压力上有更大的影响。作为同类的各向同性的土壤拿地面土壤的传统的设计方法为RE的盒子是不安全的<1并且RG<1，一个横着各向同性的基础模型因此具有到为高火车速度的设计的大意义。

简介：

简介：Thefollowingarticlepublishedonlineat10July2017,DOI:10.1007/s12209-017-0075-9,hasbeenretractedbyagreementbetweentheauthorsandthejournal'seditors.Theretractionisduetoduplicatepublication,fig.1,2,3,4,6,7,12,14,15,table1,2,3,4,5,6inthepaperhadalreadybeenpublishedinSteelandCompositeStructures,Vol21,no1.Theonlineversionofthisarticlecontainsthefulltextoftheretractedarticleaselectronicsupplementarymaterial.

简介：

简介：我们在一个绝缘的平板附近处于一个原子的自发的排放率学习摆动。排放率用量electrodynamics作为系统尺寸的一个函数被计算。它展出多周期的摆动。摆动的四频率被Fourier变换提取。他们同意光子的行动靠近轨道的走开并且回到原子。当在射出的光子之间的量干扰效果的表明在原子和回来的光子附近飘动，这些摆动被解释波浪旅行沿着各种各样靠近轨道。

简介：

简介：我们在场薄绝缘的核心层的接口上的波浪繁殖利用表面电浆子电磁声子(SPP)在二之间夹了的兆兆赫(THz)的全面试验性的研究弄皱金属性的claddings。THz波浪在正常发生在结构化的表面上侵犯。长持续的摆动繁殖特征在通过周期的数组旅行以后在时间的波形被观察。提高的THz传播能由于在事件之间联合被完成在底部和最高的接口向SPP招手。有限元素方法被用来在波导模仿地分发和传播模式。有低吸收的混合波导在THz综合设备有大潜在的应用。

简介：我们基于silicon-on-insulator(SOI)表明photonic水晶异种波导平板，连续地由二组成与邻近波导的空气洞的不同半径连接了减少宽度的photonic水晶波导。我们理论上证明结构的传播窗户对应于对波导和它普通的传播范围在到在二波导之间的差异的反的比例。另外，指导模式的组速度能被改变从对高度或高度到低低，取决于哪个结构移植信号是输入从就在一样，设备，和变化与在二波导之间的差异成正比。用这新奇结构，我们同时认识到传播窗户和指导模式的组速度的灵活控制。

简介：摘要：SLAB模型是现行环境风险评价导则《建设项目环境风险评价技术导则》（HJ169—2018）推荐使用的大气环境风险预测模型，适应于平坦地形背景下重质气体扩散的大气环境风险预测。根据气体泄漏时进入大气环境中的物质性质和理查德森数（Ri）来判断气体性质，属于重质气体的泄漏扩散采用SLAB模型进行大气环境风险预测。理查德森数的计算参数为气体膨胀至环境气压状态时对应的参数，此参数可用公式计算得到。SLAB预测模型参数中，泄漏性质参数为气体膨胀至环境气压状态时对应的参数，对泄漏物质最终预测浓度影响较大的参数有地面粗糙度和浓度平均时间，浓度计算高度的选取对预测结果实际对人群的影响较重要。适当的参数选取，能得到更准确地预测结果，更好的指导环境风险事故的应急与疏散。

简介：一个二维的电磁的Particle-in-Cell(照片)模拟模型被建议与横梁宽度w学习强烈离子横梁的繁殖与电子皮肤深度c/相比小的b通过背景血浆的pe面对外部应用磁场。有效电子gyroradiusw<潜水艇class=“a-plus-plus”>ge被发现面对磁场是为离子横梁运输的一个重要参数。在横梁区域，背景血浆对宽度w的离子横梁不同地作出回应bwge为给定的磁场和横梁精力。为横梁宽度w的盒子bb>w<潜水艇class=“a-plus-plus”>有相对强壮的外部磁场的ge，血浆电子的旋转效果强烈被禁止，离子横梁电流的井中立化能被发现。最后，不同横梁宽度的影响，离子横梁电流的中立化上的横梁精力和磁场为w的盒子被总结b

简介：Thedirectrollingprocessforhotstripproduction,wherethethinslabcasterisconnecteddirectlytothemill,hasgainedmarketsharerapidlybecauseofitsremarkableadvantagesintermsofenergysavingsandinvestmentcostovertheconventionalhotstripmills.However,theunquestionableadvantagesofthefirst-generationapplicationsofthisplantconceptalsoentailsignificantlimitationsbothinproductivityandsteelgradesthatcanbeproduced.Sincehisfirstpioneeringapplications,Danieliconsideredstrategicthedevelopmentofnewtechnicalsolutionsspecificallyconceivedtoovercometheselimitationswiththegoalofincreasingplantproductionvolumesandenlargingsteelgradeproductmix,inordertocoverthegapbetween'Conventionalmill'and'Thinslabcastingandrolling'processroutes.Inordertoreachthisgoal,DanielihasdevelopedacompleteportfolioofplantlayoutsadoptingThinSlabCastingandRollingtechnologies,eachofthemconceivedtoguaranteetheoptimalCAPEXandOPEXparametersinfittingwithmarketrequirementsourCustomerintendtotarget.intermsofproductivity,steelgradesandcoildimensionproductmix.DanieliTSR(ThinSlabRolling)fTSR(flexibleThinsSlabRolling)QSP(QualityStripProduction)andETR(ExtraThinRolling)plantconfigurationsareanalyzedinthispaper.Withthisdiversifiedapproach,Danielisolutionsaremostappropriateanswerstothinslabcastingandrollingtoproducehotrolledcoilswithsuperiorqualityandanextremelydiversifiedrangeofsteelgrades.Already,thisapproachhasallowedDanieliplantsto:①exceedthethresholdproductionof3.0Mt/awith2castingstrandsinoperationasdoneinTangshanIronandSteelplantinP.R.Chinasince2005;②expandtheproductmixtoincludevirtuallyallthesteelgradesusedforflatproductapplications,includingthemostdemandingones,suchasperitectic(inEssarAlgomaCanadaandBenxiIronandSteel,China),micro-alloyed,andsiliconsteels,forthemostsophisticatedapplications,

简介：激光二极管栈抽结束的电镀物品光学地切换Q的Nd:有near-diffraction-limited输出的钇铝柘榴石平板振荡器放大器系统被一个马厩不稳定的混合共鸣器表明。以有脉搏宽度14.7ns的10kHz的重复率的100W的平均力量和以有10.2ns的脉搏宽度的5kHz的重复率的76.3W的平均力量被测量。以10kHz的重复率并且在89W的产量力量，在不稳定、稳定的方向的横梁质量因素M2分别地是1.3和1.5。[从作者抽象]