简介：Inthepreprocessingphase,theglobalterrainmodelispartitionedintoblockswiththeirfeaturepointsbeingpickedouttogenerateTINmodelforeachterrainblock,thenthemulti-resolutionmodelsofterrainorganizedintheformofquad-treeiscreatedbottom-up.Cracksbetweenterrainblocksareavoidedbyinsertingverticestoformcommonboundaries.Atrun-time,aview-dependentLODalgorithmisusedtocontroltheloadingandunloadingoftheproperblocksbyanadditionalsynchronousthread.ToeliminatetheartifactscreatedbyLODtransitions,geomorphingisusedinreal-time.TheserenderingstrategiesincreasethethroughputofGPUandavoidimbalanceofloadamongCPU,GPUandDiskI/O.Experimentalresultsshowthatthesystemcanperformvisuallysmoothrenderingoflarge-scaleterrainsceneswithfinequalityatanaveragerateof80fps.

简介：

简介：大木质的碎片(LWD)减少流动区域，背离流动和增加在桥墩的通讯的速度，因此增加最大值搜索洞深度并且加速沉积移动。在桥墩上积累的木头和飘移具有不同尺寸。根据木头特征和河形态学，飘移累积也能下游地扩大桥墩或他们能积累完全在上游。这份报纸试图在桥牌上分析飘移累积测面积池的效果墩搜索。试验性的调查在土木工程部门的PITLAB水力的中心被执行了，比萨的大学，意大利。飘移累积被不同相对纵的长度，流动区域吸藏，一些纵的飘移和下游的planimetrical位置相对墩中心描绘。试验性的调查处于清楚水的条件被执行了。几种墩尺寸，隧道宽度和沉积材料被测试了。最大在累积与最大值相比的飘移的存在搜索洞为孤立的墩搜索洞。最后，数据与以前的文学调查结果相比，它在桥牌上加亮飘移累积的下游的延期的效果墩搜索。新关系被建议了在桥码头上预言飘移累积的效果搜索，两个以相对最大值搜索并且时间搜索进化。

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简介：Theretrofitprojectof800-kVlargecapacityexperimentsysteminXi'anHighVoltageEquipmentResearchInstitutewascompletedsometimeago.Thesystemcanmeetrequirementsofwholepoleexperimentof550-kV63-kAand800-kV63-kAcircuitbreakersbyIECNorm.Itscapacitortowerisover100tinweightand15minheight.Thevoltageofeachcapacitorbankcanreach1000kV.

简介：Longwavesgeneratedbyamovingatmosphericpressuredistribution,associatedwithastorm,incoastalregionareinvestigatednumerically.Forsimplicitythemovingatmosphericpressureisassumedtobemovingonlyinthealongshoredirectionandthebeachslopeisassumedtobeaconstantintheon-offshoredirection.Bysolvingthelinearshallowwaterequationsweobtainnumericalsolutionsforawiderangeofphysicalparameters,includingstormsize(2a),stormspeed(U),andbeachslope(α).Basedonthenumericalresults,itisdeterminedthatedgewavepacketsaregeneratedifthestormspeedisequaltoorgreaterthanthecriticalvelocity,Ucr,whichisdefinedasthephasespeedofthefundamentaledgewavemodewhosewavelengthisscaledbythewidthofthestormsize.ThelengthandthelocationofthepositivelymovingedgewavepacketisroughlyUt/2≤y≤Ut,whereyisinthealongshoredirectionandtisthetime.Oncetheedgewavepacketisgenerated,thewavelengthisthesameasthatofthefundamentaledgewavemodecorrespondingtothestormspeedandisindependentofthestormsize,whichcan,however,affectthewaveamplitude.Whenthestormspeedislessthanthecriticalvelocity,theprimarysurfacesignatureisadepressiondirectlycorrelatedtotheatmosphericpressuredistribution.

简介：WestudyhowtousetheSR1updatetorealizeminimizationmethodsforproblemswherethestorageiscritical.Wegiveanupdateformulawhichgeneratesmatricesusinginformationfromthelastmiterations.Thenumericaltestsshowthatthemethodisefficent.

简介：Asequentialextractionmethodforthefractionationofphosphorus(P)inlakesedimentswasusedtoanalyzephosphorusfractionsofsedimentstakenfromthreelarge,shallow,eutrophicfreshwaterlakesofChina-TaihuLake,ChaohuLake,andLongganLake.AllthreelakesarelocatedinthelowerreachesoftheChangjiangRiver(YangtzeRiver).InTaihuLakeandChaohuLake,algaebloomsoccurredeveryyear,whileLongganLakewasamacrophyte-dominatedlake.Resultsshowedthatexchangeablephosphorusfractionsweremuchhigherintheeutrophiclakesedimentsthaninthemacrophyte-flourishinglakesediment.Also,theratioofFe:Pinthesedimentsofthealgae-predominantlakeswasgenerallymuchlowerthanthatinthemacrophyte-predominantlakes.Thus,thegeochemicalfractionsofphosphorusinsedimentshadacloserrelationshipwiththetypeofaquaticvegetation.

简介：Inremotesensingorlasercommunicationspacemissions,spacecraftneedfastmaneuverandfaststabilizationinordertoaccomplishagileimagingandattitudetrackingtasks.However,fastattitudemaneuverscaneasilycauseelasticdeformationsandvibrationsinflexibleappendagesofthespacecraft.Thispaperfocusesonthisproblemanddealswiththecombinedcontroloffastattitudemaneuverandstabilizationforlargecomplexspacecraft.Themathematicalmodelofcomplexspacecraftwithflexibleappendagesandmomentumbiasactuatorsonboardispresented.Basedontheplantmodelandcombinedwiththefeedbackcontroller,modalparametersoftheclosed-loopsystemarecalculated,andamultiplemodeinputshaperutilizingthemodalinformationisdesignedtosuppressvibrations.Aimingatreducingvibrationsexcitedbyattitudemaneuver,aquinticpolynomialformrotationpathplanningisproposedwithconstraintsontheactuatorsandtheangularvelocitytakenintoaccount.Attitudemaneuversimulationresultsofthecontrolsystemswithinputshaperorpathplanninginloopareseparatelyanalyzed,andbasedontheanalysis,acombinedcontrolstrategyispresentedwithbothpathplanningandinputshaperinloop.Simulationresultsshowthatthecombinedcontrolstrategysatisfiesthecomplexspacecraft’srequirementoffastmaneuverandstabilizationwiththeactuators’torquelimitationsatisfiedatthesametime.

简介：WithrespecttothecrestspillwaywithlargeunitdischargeandlowFroudenumber,thehydraulicsoftheslit-typeenergydissipaterattheoutletshouldbenoticedduetothecomplicatedflowregimes.Inthepresentpaper,someissuesabouthydrauliccharacteristicswereexperimentallyinvestigatedbymeansoffiveslit-typeoutletsandfourtetrahedrons,includingtheflowchoking,impacttoriverbanksandjettrajectory.Themainfindingsareasfollows.ThecriticalFroudenumberfortheflowchokingdecreaseswithincreasingoutletwidthoftheslit-typeenergydissipater.IftheflowFroudenumberisexpressedbytheparametersjustbeforethisenergydissipater,thetetrahedronplacedinsidethesidewalloftheoutletcouldefficientlyavoidtheflowimpacttotheriverbankofsameside,andcomparedwiththejettrajectoryoftheslit-typeenergydissipater,theoutletwithtetrahedronhasdifferenttrajectorytrend,i.e.,thedistanceofthejettrajectorydecreaseswiththeincreaseofthewaterheadduetospecialformoftheoutlettetrahedron.

简介：LargeHighEnergyandNuclearPhysics(HENP)databasesarecommonlystoredonrobotictapesystemsbecauseofcostconsiderations.Later,selectedsubsetsofthedataarecachedintodiskcachesforanalysisordatamining.Becauseoftherelativelylongtimetomount,seek,andreadatape,itisimportanttominimizethenumberoftimesthatdataiscachedintodisk.Havingtoolittlediskcachewillforcefilestoberemovedfromdiskprematurely,thusreducingthepotentialoftheirsharingwithotherusers.Similarly,havingtoofewtapedriveswillnotmakegooduseofalargediskcache,asthethroughputfromthetapesystemwillformthebottleneck.Balancingthetapeanddiskresourcesisdependentonthepatternsoftherequeststothedata.Inthispaper,wedescribeasimulationthatcharacterizessuchasystemintermsofthersourcesandtherequestpatterns.Welearnfromthesimulationwhichparametersaffecttheperformanceofthesystemthemost.Wealsoobservefromthesimulationthat,thereisapointbeyondwhichitisnotworthinvestinginadditionalresourcesasthebenefitistoomarginal.Wecallthispointthe"point-of-no-benefit"(orPNB),andshowthatusingthisconceptwecanmoreeasilydiscovertherelationshipofvariousparameterstotheperformanceofthesystem.

简介：Inthisstudy,thespheroidizationprocessoflarge-deformedsteelundervariousconditionswasresearched.Steelwithahighcarboncontent(1.0%C)wasfirsttreatedthermomechanicallyusingmultipassrolling.Thenitunderwentspheroidizationtreatmentsatdifferentheatingtemperatures,usingvariousheatingtimesandcoolingrates.Spheroidizationprocesseswithalowerheatingtemperature,shorterheatingtime,orfastercoolingratethanthoseofthetraditionalprocessallshowedgoodresults,indicatingthatthespheroidizationprocesswaspromotedsignificantlybythelargedeformationprocess.Grainrefinementandfragmentationofcementite,alongwiththelargedeformationprocess,promotedthisspheroidizationprocess.

简介：焊接顺序在通常在轮船使用的大直角地使硬的面板的失真模式上有重要效果并且近海结构。这些变丑不利地影响邻近的面板的随后的移动舞台和排列。它可以也导致结构的正直的损失。这些面板首先受不了尖、弄弯的失真。失真的程度取决于象焊接焊接的速度，板厚度，焊接电流，电压，当焊接时，用于这个工作的抑制，热历史以及顺序那样的几个参数。焊接和FE模型的试验性的确认的数字建模为热历史和产生失真的评价被执行了。在现在的工作，一个FE模型为学习在直角地使硬的板面板的制造在失真模式和它的大小上焊接顺序的效果被开发了。

简介：

简介：一个向轴的方向的大偏转有一张矩形的剖面图的可扩展的弄弯的横梁被调查。有弹性的横梁被假定满足Euler-Bernoulli假定并且用Ludwick类型材料做的。通过相当简化的集成，横梁的轴的紧张和弯曲在含蓄的明确的表达被介绍。包含的管理方程几何并且弄弯的横梁的材料非线性被射击方法导出并且解决。当横梁的起始的弯曲是零时，弄弯的横梁被堕落进一根直横梁，并且现在的模型获得的预言的结果与在开的文学的那些一致。数字例子进一步为弄弯的伸臂被给并且简单地支持在延伸之间的横梁，和couplings并且弯曲被作出对有利的裁决弄弯的横梁。

简介：Simulationandrenderingoflarge-scalenaturalenvironments,especiallytheocean,hasalwaysbeenoneofthehotissuesincomputergraphics,whichcanproviderealismforvariousapplicationssuchascomputergame,movieandmilitaryusage.Simulationofoceanenvironmentisoftenlackofrealismforreal-timeapplicationduetoitscomplexityofdynamicwaves.Inthispaper,amethodbasedonFFTWavemodelisproposedtosolvethisproblem,whichcanalsosimulatetheoceanopticpropertywithatmospherescattering.Furthermore,ourmethodhasalotofadvantagesincludingglobaloceandatasetsupport,real-time,dynamicreflectionofocean,thefoamonthewave,smoothtransitionfromdeepoceantoseacoast,etc.Theexperimentalresultsdemonstratetherealismandeffectivenessofourapproach.

简介：Inthispaper,westudytheelectromagneticscatteringfromatwodimen-sionallargerectangularopencavityembeddedinaninfinitegroundplane,whichismodelledbyHelmholtzequations.Byintroducingnonlocaltransparentboundarycon-ditions,theproblemintheopencavityisreducedtoaboundeddomainproblem.AhypersingularintegraloperatorandaweaklysingularintegraloperatorareinvolvedintheTMandTEcases,respectively.Anewsecond-orderToeplitztypeapproximationandasecond-orderfinitedifferenceschemeareproposedforapproximatingthehyper-singularintegraloperatorontheapertureandtheHelmholtzinthecavity,respectively.TheexistenceanduniquenessofthenumericalsolutionintheTEcaseareestablishedforarbitrarywavenumbers.Afastalgorithmforthesecond-orderapproximationispro-posedforsolvingthecavitymodelwithlayeredmedia.Numericalresultsshowthesecond-orderaccuracyandefficiencyofthefastalgorithm.Moreimportantisthatthealgorithmiseasytoimplementasapreconditionerforcavitymodelswithmoregeneralmedia.

简介：让fn基于内核函数K和在d维的单位范围Sd拿值的独立、相等分布式的随机的变量的一个序列是方向性的数据的非参量的内核密度评估者?1。如果核功能是有围住的变化的功能，随机的变量的密度功能f是连续的，它被证明那，那么大的偏差原则和中等偏差原则为成立。关键词核密度评估者-方向性的数据-中等偏差-大偏差先生(2000)题目分类60F10-62F12由中国(资助号码10571139)的国家自然科学基础支持了

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简介：ＡｎａｌｙｓｉｓａｎｄｓｔｕｄｙｏｆｔｈｅｌａｒｇｅｅａｒｔｈｑｕａｋｅｒｉｓｋｉｎＹａｎｑｉｎｇＨｕａｉｌａｉｂａｓｉｎＣＨＡＮＧＱＵＡＮＬＩＵ（刘昌铨）ＳＨＩＸＵＪＩＡ（嘉世旭）ＭＩＮＧＪＵＮＬＩＵ（刘明军）ＣＨＡＮＧＦＡＬＩ（李长发...