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简介：一系列2D模型测试被进行估计合成垂直防波提的基础稳定性。在这篇论文，从试验性的学习的结果与一个公式相连地被介绍估计基础的稳定性数字，它是为如此的结构的基础稳定性的评估的最重要的参数。有不同盔甲石头尺寸的合成防波提的稳定性上的波浪高度，波浪时期和城墙与外濠间之狭道宽度的影响被调查。45测试被执行盖住这些参数的影响。根据现在的研究，城墙与外濠间之狭道宽度是有关盔甲基础的侵蚀的一个重要参数。作为城墙与外濠间之狭道宽度增加，城墙与外濠间之狭道侵蚀的数量减少。比较在现在的学习和Kimura等建议的估计的稳定性数字的结果之间被做。(1994)，它是Tanimoto的扩展公式。结果证明以后的公式低估稳定性数字。然而，由使用一个改进因素大约1.7米到Kimura等。公式，结果与现在的试验性的结果相关……

简介：Asinreadingteaching,schematheoryhaslongbeentakingadominantpart.Accordingtothistheory,Englishteacherscanhelpthestudentstocalluptheirpriorknowledgebyplacinganemphasisonamoreefficientuseofpre-readingactivities.Oneoftheeffectiveactivitiesistomakegooduseofthepre-readingexercisesinthetextbook.Thispaperintendstoanalyzetheresultsoftwobriefinvestigations.Onewasaboutthepre-readingexercisesintheSEFC(NewEdition2010)Book1.Theotherwascar-riedoutamongthefirstyearstudentsfromNanhaiExperimentalHighSchoolofSouthChinaNormalUniversity.Englishteachersinhighschoolthuscantrainthestudentstomakelinksbetweenthetextandwhattheyalreadyknowaccordingtotheirinterests.

简介：Thetheoryofflowsimilarityhasnotbeenwellestablishedforgranularflows,incontrasttothecaseforconventionalfluids,owingtoalackofreliableandgeneralconstitutivelawsfortheircontinuumdescription.Arigorousinvestigationofthesimilarityofvelocityfieldsindifferentgranularsystemswouldbevaluabletotheoreticalstudies.However,experimentalmeasurementsfacetechnologicalandphysicalproblems.Numericalsimulationsthatemploythediscreteelementmethod(DEM)maybeanalternativetoexperimentsbyprovidingsimilarresults,wherequantitativeanalysiscouldbeimplementedwithvirtuallynolimitation.Inthisstudy,thesimilarityofvelocityfieldsisinvestigatedfortherollingregimeofrotatingdrumsbyconductingsimulationsbasedontheDEMandusinggraphicsprocessingunits.ForaconstantFroudenumber,itisfoundthattheparticle-to-drumsizeratioplaysadominantroleinthedeterminationofthevelocityfield,whilethevelocityfieldismuchmoresensitivetosomematerialpropertiesthantoothers.Theimplicationsofthesefindingsarediscussedintermsofestablishingtheoreticalsimilaritylawsforgranularflows.

简介：Thispaperpresentsamodifiedhalf-sine-squaredloadmodelofthejumpingimpulsesforasingleperson.Themodelisbasedonadatabaseof22,921experimentallymeasuredsinglejumpingloadcyclesfrom100testsubjects.Threedimensionalmotioncapturetechnologyinconjunctionwithforceplateswasemployedintheexperimenttorecordjumpingloads.Thevariationrangeandprobabilitydistributionofthecontrollingparametersfortheloadmodelsuchastheimpactfactor,jumpingfrequencyandcontactratio,arediscussedusingtheexperimentaldata.Correlationrelationshipsbetweenthethreeparametersareinvestigated.Thecontactratioandjumpingfrequencyareidentifiedasindependentmodelparameters,andanempiricalfrequency-dependentfunctionisderivedfortheimpactfactor.Thefeasibilityoftheproposedloadmodelisestablishedbycomparingthesimulatedloadcurveswithmeasuredones,andbycomparingtheaccelerationresponsesofasingle-degree-of-freedomsystemtothesimulatedandmeasuredjumpingloads.Theresultsshowthatarealisticindividualjumpingloadcanbegeneratedbytheproposedmethod.Thiscanthenbeusedtoassessthedynamicresponseofassemblystructures.

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简介：Theseparating/reattachingflowoveranaxisymmetricbackward-facingstepisanalyzedexperimentallybymeansofparticleimagevelocimetry(PIV).ThemainpurposeofthemeasurementsistheinvestigationofthemeanflowfieldaswellasoftheReynoldsstressdistributionsataMachnumberof0.7andataReynoldsnumberof3.3x10~5basedonthestepheight.Duetothestrongprogressofopticalflowmeasurementsinthelastyearsitwaspossibletoresolveallflowscalesdownto180μm(≈1%ofthestepheight)withhighprecision.ThankstothehighspatialresolutionitwasfoundforthefirsttimethattheReynoldsstressdistributionfeaturesalocalminimumbetweenthefirstpartoftheshearlayerandaregioninsidetherecirculationregion.Thisimpliesamorecomplexwakedynamicsthanassumedbefore.

简介：Withthecontinuousimprovementofproductqualityandfunction,thequalitycontrolofmoldsteelisbecomingincreasinglystricter.Argonprotectionisessentialforensuringcastingqualityduringingotcasting.Thedevelopmentofargonprotectioniningotcastingandtheproductionprocessofenclosedargonprotectionin40tlineisdiscussed,withparticularfocusgiventhefactorsaffectingtheflowofoxygenintheargonprotectioncoverarediscussed.Theinfluenceofsomerelatedfactorsontheoxygencontentisanalyzed.Onthebasisoftheonlinemeasurementsoftheoxygencontent,theoptimizedoperationalapproachesforimprovingtheeffectofargonprotectionaredeveloped.Thiscandecreasetheliquidsteelviasecondaryoxidation,andimprovethequalityoftheingots.

简介：ThermalcharacteristicsarenumericallyinvestigatedforthehybridAlGaInAs/InPonsiliconmicroringlaserswithdifferentringradiiandwidths.Lowthresholdcurrentandlowactiveregiontemperatureriseareexpectedforamicroringlaserwithanarrowringwidth.Basedonthethermalanalysisandthe3Dsimulationformodecharacteristics,ahybridAlGaInAs/InPonsiliconmicroringlaserswithaninnern-electrodelaterallyconfinedbythep-electrodemetalliclayerisfabricatedusinganadhesivebondingtechnique.Athresholdcurrentof4mAisachievedforahybridmicroringlaserwitharadiusof20μmandaringwidthof3.5μmat12°C,andthecorrespondingthresholdcurrentdensityisaslowas1kA∕cm~2.Theinfluenceofthelocationofsiliconwaveguideonoutputperformanceisstudiedexperimentallyforimprovingtheoutputcouplingefficiency.Furthermore,continuous-waveelectricallyinjectedlasingupto55°Cisrealizedforahybridmicroringlaserwitharadiusof30μmandaringwidthof3μm.

简介：6.5Ludian地震引起了617的一个死亡人数的2014大小，许多山崩和几万座折叠大楼。评估损坏到大楼的地调查在地震的出现以后立即被执行。严重地损坏的aseismic大楼，基本上在Longtoushan镇的闹市区被观察，小心地与目的一个一个地被检验改进设计代码。这份报纸总结在两个观察到调查aseismic大楼的损坏结构、本地的层次。一个普通失败模式被观察aseismic大楼的那个大多数例如RC框架结构和限制石工技术结构，被严重损坏或第一个故事的完全的倒塌同样破坏。相关充分的理由运动，在附近的车站被记录，有不到20s的短持续时间但是很大的针网阵列直到1.0g。基于新设计，代码仍然没能完成设计的RC框架为强壮的列指向，弱横梁。典型本地失败细节，与在RC列和填入墙之间并且在构造上的列和石工技术墙之间的相互作用有关，与初步的分析被总结。

简介：Underanappliedvoltage,dielectricelastomers(DEs)produceanactuationstrainthatisnonlinear,partlybecauseofthematerialproperties.Inthisstudy,anexperimentalcharacterizationisconductedtoevaluatehowtheambienttemperatureandpre-stretchaffectedtheactuationperformance.ForDEswithapre-stretchof2×2,anincreaseoftemperaturefrom-10°to80°resultsinavariationintheactuationstrainofmorethan1700%.Lowpre-stretchedDEsaremoresusceptibletotemperaturechange;whilehighlypre-stretchedDEsarerelativelyinsensitivetotemperature,becauseinthiscasetheenergyconversionwasdominatedbymechanicalstretching,ratherthanthermalconduction,duringtheactuation.

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简介：Thenon-edibleoilsarebelievedtobeoneofthemajorfeedstockfortheproductionofbiodieselinfuture.Inthepresentstudy,weinvestigatedtheproductionofJatrophaoilmethylesters(JOMEs)viaalkali-catalyzedtransesterificationroute.ThebiophysicalcharacteristicsofJatrophaoilwerefoundwithintheoptimalrangeinaccordancewithASTMstandardsasasubstitutedieselfuel.Thechemicalcompositionandproductionyieldofas-synthesizedbiodieselwereconfirmedbyvariousanalyticaltechniquessuchasFT-IR,1HNMR,13CNMRandgaschromatographycoupledwithmassspectrometry.Ahighpercentageconversion,～96.09%,offattyacidsintoesterswasachievedunderoptimizedtransesterificationconditionswith6:1oiltomethanolratioand0.9wt%NaOHfor50minat～60°C.Moreover,twelvefattyacidsmethylesters(FAME)werequantifiedintheGC/MSanalysisanditwasinterestingtonotethatthemassfragmentationpatternofsaturated,monounsaturatedanddiunsaturatedFAMEwascomparablewiththeliteraturereportedvalues.

简介：Thestructural,electronic,andelasticpropertiesofZnSe1-xSxforthezincblendestructureshavebeenstudiedbyusingthedensityfunctionaltheory.Thecalculationswereperformedusingtheplanewavepseudopotentialmethod,asimplementedinQuantumESPRESSO.Theexchange-correlationpotentialistreatedwiththelocaldensityapproximationpz-LDAfortheseproperties.Moreover,LDA+Uapproximationisemployedtotreatthe"d"orbitalelectronsproperly.AcomparativestudyofthebandgapcalculatedwithinbothLDAandLDA+Uschemesispresented.Theanalysisofresultsshowconsiderableimprovementinthecalculationofbandgap.Theinclusionofcompositionaldisorderincreasesthevaluesofallelasticconstants.Inthisstudy,itisfoundthatelasticconstantsC11,C12,andC44aremainlyinfluencedbythecompositionaldisorder.Theobtainedresultsareingoodagreementwithliterature.

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简介：结构，机械，电子，并且NaZnSb的结合的性质和阶段转变基于abinitio飞机波浪pseudopotential密度用概括坡度近似被探索功能的theory.With伪泛音Debye模型的帮助，我们探查Gr??????舀?

简介：Arandomdistributedfeedbackfiberlaserwithlinearpolarizedoutputat1178nmispresented.Linearpolarizationisrealizedbyfibercoilinginahalf-openedcavityofapolarizationmaintainingrandomfiberlaserstructure.Thesinglelinearpolarizationlaseroutputpowerreaches~3Wwithpolarizationextinctionratio>14dB.Furtherinvestigationsonthecoilingtechniqueandadditionalfeedbackarealsostudied.Sofarasweknow,thisisthefirstreportedlinearpolarizedrandomdistributedfeedbackRamanfiberlaser.

简介：新frontogenesis功能根据结果的变丑的绝对水平坡度的本地变化率被开发并且分析。与传统的frontogenesis功能不同，最新定义的变丑frontogenesis从动力学而非热力学的观点被导出。因此，因为温度和潮湿的isolines的压缩能被一个流动领域的变化直接导致，它为frontogenesis的学习是更直觉的。这新frontogenesis功能为因为mei-yu雨线典型地比温度坡度由一个强壮得多的潮湿坡度组成，在中国学习mei-yu前面是特别地有用的，并且包含大变丑流动。真实mei-yu的分析正面的降雨事件显示变丑frontogenesis功能显著地工作很好，基于潜在的温度坡度的一项措施比传统的frontogenesis功能生产更清楚的mei-yu前面。更重要地，变丑frontogenesis表演关上关联与随后(6h以后)降水模式和封面雨线为预后或甚至未来降水的预言的好、适用的意义。

简介：Theyaweffectofthesideflowaroundahigh-speedtrainisstudiedbymeansoflargeeddysimulationattwotypicalyawanglesofφ=30°and60°,respectively.Boththemeanandfluctuatingvaluesofliftforceandsideforcecoefficientsincreaseobviouslyastheyawangleincreases.Thespectralanalysisindicatesthatthetime-dependentaerodynamicforcesaredominatedbyseveralenergeticfrequenciesandthefrequencyrangeisbroadenedtoahigherextentforthelargeyawangle.Tohaveabetterunderstandingofthetrainaerodynamicbehaviors,thededicatethree-dimensionalvorticalstructuresareanalyzedfortheflowatthetwoyawangles.Moreover,thetime-averagedflowpatterns,turbulentstatisticsandthesurfaceforcesarealsostudiedonsectionalplanesalongthetrain.