简介：在2015年9月8-9日发生在四川省上的一个地区性的重降水事件基于从气象站获得的时时观察的降水数据和NCEPFNL数据被分析。二个潮湿的动态参数，即，潮湿的涡度(m)和潮湿的分叉(m)，被用来诊断这个重降水事件。结果证明在西南的中国上的地形学有这二个参数的能力上的重要影响诊断降水。当地形学的影响是弱的时(即，低高度)，m不能确切在事件的起始的阶段描绘降水的地点。然后，当降水发展，它描绘地点的能力显著地改善。特别地，m在事件的山峰阶段期间与降水的地点与最好一致。而且，m中心的进化与降水中心的进化显示出高一致性。为m，尽管一些虚惊的区域是明显的，它几乎完全在降水事件期间反映降水的地点。然而，m中心与降水中心显示出矛盾。这些结果建议m和m有一个重要能力预言降水的地点。而且，m以预言降水中心的可变性比m有一个更强壮的能力。不管多么当地形学的影响是强壮的时(即，高高度)，这两二个潮湿的动态参数是不能的在全部降水事件期间描绘降水的地点和中心，建议他们的弱能力在复杂地形学上预言降水。

简介：在变丑和垂直涡度趋势之间的一种数学关系被介绍frontogenesis功能和完全的垂直涡度方程造，它被潮湿的潜在的涡度的优点导出。从数学关系，适当地设置了大气的条件，这被显示出能让变丑以比得上另外的有利因素的率施加积极贡献到旋涡开发。在旋涡开发的变丑的效果自己与变丑有关不仅，而且取决于空气的当前的热力学、动态的结构潮湿的baroclinicity和垂直的风例如对流稳定性，砍(或水平涡度)。发生在20222012年7月期间的重降雨的格的诊断研究证明那变丑在它的整个生命周期期间在低旋涡的快速的发展阶段期间在垂直涡度的增加以后有最显著的效果。这个特征在对流稳定性趋于是零的空气主要由于近似的中立的层(大约700hPa)的存在。中立的层在旋涡发展阶段期间显著地在垂直涡度增加以后做变丑的效果，并且因此驱使垂直涡度增加。

简介：Themajorflowphysicsoftheunsteadycondensationinthesubsonicflowsinducedbytheunsteadyexpansionwavesinshocktubewasstudiedinthispaper.Theunsteadycondensationphenomenonwasanalyzedbyusingthetwo-dimensional,unsteady,Navier-Stokesequations,whichwerefullycoupledwithadropletgrowthequation.Thethird-orderTVDMUSCLschemewasappliedtosolvethegoverningequationsystems.Thecomputationalresultswerecomparedwiththepreviousexperimentaldata.Thetime-dependentbehaviorofunsteadycondensationofmoistairinshocktubewasinvestigatedindetails.Theresultsshowthatthemajorcharacteristicsoftheunsteadycondensationphenomenoninshocktubeareverydifferentfromthoseinthesupersonicwindtunnels.

简介：在现在的学习，一个计算液体动力学方法被使用了在下面膨胀的声音的喷气结构上以水库状况调查过度饱和的起始的度的效果，例如马赫磁盘地点和直径，桶冲击波和喷气边界。调查的axisymmetric嘴几何学是有直部分的一张收敛的嘴。作为结果，过压由于冷凝作用产生，这被发现，没有冷凝作用，有过压的产生的流动的特征与那些由于在喷气的冷凝作用不同。

简介：Toreducemechanicalvibrationsinducedbybigerrorscompensation,anewsoftwarecompensationmethodbasedonanimproveddigitaldifferentialanalyzer(DDA)interpolatorforstaticandquasi-staticerrorsofmachinetoolsisproposed.BasedonprincipleoftraditionalDDAinterpolator,aDDAinterpolatorisdividedintocommandgeneratorandcommandanalyzer.Therearethreetypesoferrors,consideringthedifferenceofpositionsbetweencompensationpointsandinterpolationsegments.Accordingtotheclassification,errorsaredistributedevenlyindataprocessingandcompensatedtocertaininterpolationsegmentsinmachining.On-lineimplementationresultsshowthattheproposedapproachgreatlyimprovespositioningaccuracyofcomputernumericalcontrol(CNC)machinetools.

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简介：Aprocedureforreanalysisofvariousstructuressubjectedtovarioustopologicalmodifi-cationsispresented.Theprocedureisbasedontheresultsofasingleexactanalysisandthefactoriza-tionofthestiffnessmatrixofinitialstructures.Itissuitableforthecaseofadditionofjoints,wherethenumberofthedegreesoffreedomisincreased.Themethoddealswiththestiffnessmatrixofstruc-turesdirectly,soitcanbeusedwithageneralfiniteelementsystem.Itisshownthattheproposedap-proximationmethodismosteffectiveintermsofaccuracy,efficiency,andeaseofimplementation.

简介：TheobjectiveofthisstudywastoinvestigateandevaluatetherheologicalandmoisturesusceptibilityoftheWMAmixturescontainingmoistaggregates.Theexperimentaldesignincludedtheutilizationsoftwoaggregatesources,twomoisture,twoanti-strippingadditives,andthreeWMAadditivesandcontrol.Severalpropertiesofthebindersandmixtureswereobtainedincluding:viscosity,dynamicshearrheometer,beambendingrheometerofWMAbinders,indirecttensilestrength(ITS),tensilestrengthratio(TSR),andflowvalues.TheexperimentalresultsindicatethattheWMAadditivescanresultinaslightdecreaseinviscosityandanincreaseinfailuretemperature.Inaddition,themoisturesusceptibilityresultsillustratedthatthemixturescontainingmoistaggregatesgenerallyhavesimilarITSvaluestoothermixturesregardlessofHMAorWMAtypes.Moreover,therewerenosignificantdifferencesinthewetITSvaluesofWMAmixtureamongstfourtypesofmixturesunderidenticalconditions(samemoistureandlimecontents)exceptforthemixturescontainingliquidanti-strippingadditiveandAsphaminadditive.

简介：在现在的学习，一个计算液体动力学工作被执行在超声的潮湿的空气喷气由冷凝作用调查冲击波的出现。不稳定的、可压缩的axisymmetric海军司烧方程被TVD(减少的全部的变化)解决在这研究的计划。数字模拟为低压力比率和各种各样的湿度被执行了。结果为低压力比率在超声的潮湿的空气喷气看冲击波的出现马赫磁盘什么时候不发生，取决于空气的湿度。

简介：Theimpactsoftheenhancedmodel’smoistphysicsandhorizontalresolutionupontheQPFs(quantitativeprecipitationforecasts)areinvestigatedbyapplyingtheHIRLAM(highresolutionlimitedareamodel)tothesummerheavy-raincasesinChina.Theperformanceofthecontrolrun,forwhicha0.5°×0.5°gridspacingandatraditional“grid-boxsupersaturationremoval+Kuotypeconvectiveparamerization”areusedasthemoistphysics,iscomparedwiththatofthesensitivityrunswithanenhancedmodel’smoistphysics(Sundqvistscheme)andanincreasedhorizontalresolution(0.25°×0.25°),respectively.Theresultsshow:(1)Theenhancedmoistphysicsscheme(Sundqvistscheme),byintroducingthecloudwatercontentasanadditionalprognosticvariableandtakingintoaccountbrieflyofthemicrophysicsinvolvedinthecloud-rainconversion,doesbringimprovementsinthemodel’sQPFs.AlthoughthedeterioratedQPFsalsooccuroccasionally,theimprovementsarefoundinthemajorityofthecases,indicatingthegreatpotentialfortheimprovementofQPFsbyenhancingthemodel’smoistphysics.(2)Byincreasingthemodel’shorizontalresolutionfrom0.5°×0.5°,whichisalreadyquitehighcomparedwiththatoftheconventionalatmosphericsoundings,to0.25°×0.25°withoutthesimultaneousenhancementinmodelphysicsandobjectiveanalysis,theimprovementsinQPFsareverylimited.Withhigherresolution,althoughslightameliorationinlocatingtherainfallcentersandinresolvingsomefinerstructuresofprecipitationpatternaremade,thenumberofthemis-predictedfinestructuresinrainfallfieldincreaseswiththeenhancedmodelresolutionaswell.

简介：Whencondensationoccursinsupersonicflowfields,theflowisaffectedbythelatentheatreleased.Inthepresentstudy,Navier-Stokesequationsweresolvednumericallyusinga3rd-orderMUSCLtypeTVDinite-differenceschemewithasecond-orderfractional-stepfortimeintegration,Baldwin-Lomaxmodel,thatisthealgebraicmodel,calledthezeroequationmodelwasusedinthecomputations.Theeffectsofinitialconditions(initialdegreeofsupersaturationandtotaltemperatureinthereservoir)oncondensingflowofmoistairinasupersoniccircularhalfnozzlewereinvestigated.Inthiscase,theeffectofcondensationontheboundarylayerwasalsodiscussedindetail.Asaresultthesimulatedflowfieldswerecomparedwithexperimentaldataingoodagreement,andthevelocityandtemperatureprofileswerelargelychangedbycondensation.

简介：InthispaperanumericalanalysismethodcombiningFEMincementaltechniquewithlimitanalysisconceptisproposedforthestudyofthestaticstrengthofoffshoreplatformincollision.Largedeformationandplasticityareaccountedforandthelimityieldsurfaceexpressedbygeneralizedstressforatubularsectionisderived.ThemodifiedstiffnessmatrixofspacebeamelementisformulatedbyPlasticNodeMethod.Thebucklingbehaviorofbeamcolumnscanalsobetakenintoaccount.Itcantracethegenerationofplastichingesduringloadingandfinallytheultimatestrengthofoffshoreplatformagainstcollisionisobtained.

简介：这份报纸测试在与奔流的雨联系的异例由使用第五产生的NCAR/佩恩状态Mesoscale模型(MM5)输出的好模型模拟数据由台风No.9914(丹)引起了的潮湿的潜在的涡度(MPV)上强迫的导致云的质量的影响。诊断结果证明积极MPV异例区域，它被从600hPa集成MPV到300hPa在获得垂直，粗略地在位置或在分发模式在他们的同步阶段与降水与一致，并且丹的最大的积极MPV区域主要在600hPa和300hPa之间被定位，它比奔流的雨盒子高得多。进一步的分析也证明积极MPV异例的值与丹的开发增加了或减少，并且积极MPV异例可以也作为tracer被服务显示热带气旋紧张的进化。

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简介：Themediumaccesscontrol(MAC)protocolforindoorvisiblelightcommunication(VLC)withenergyharvestingisexploredinthispaper.Theunfairnessofthroughputexistsamongdevicesduetothesignificantdifferenceoftheirenergyharvestingrateswhichchangeswithdistance,acceptanceangleandtheobstructionprobability.Weproposeanenergyharvestingmodel,anewobstructionprobabilitymodelandanenergyadaptivecontentionalgorithmtoovercometheunfairnessproblem.Thisdevicecanadjustitscontentionwindowaccordingtotheenergyharvestingrate.Asaresult,thedevicewithlowerenergyharvestingratecangetshortercontentionwindowtoimproveitstransmissionopportunity.SimulationresultsshowthatourMACprotocolcanachieveahigherdegreeoffairness.

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简介：静态的球状地对称的空间时间的保角的Ricci关口线条被学习。当Ricci张肌是非退化的时，产生保角的Ricci关口线条的向量领域的一般表格被发现，在哪个情况独立保角的Ricci关口线条的数字是15，为四维的manifolds的最大的数字。在退化盒子中，静态的球状地对称的空间时间总是有保角的Ricci关口线条的一个无限的数字，这被发现。一些例子被提供它承认重要保角的Ricci关口线条，和这件事的完美的液体来源。