学科分类
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7 个结果
  • 简介:把早期的运动基于不一致的沉积的机制,拖强迫并且高举力量系数表情为不一致的床材料暴露和靠近的排列状态被提出。不一致的沉积的早期的速度公式然后被建立。公式结构合理、好,这被显示出不一致的沉积的粒子比一样缩放一致粒子的是更困难的设定进运动,而更粗糙的粒子更容易比他们的一致等价物设定进运动。公式的有效性由地和实验数据被验证。

  • 标签: 初始速度 沉淀物 物质分配 河道处理
  • 简介:Todaywearepracticallywitnessingandexperiencingarealbotinvasion.Itisthereforepermissibletoaskoneselfwhatabotis(anditiscertainlynot“sciencefiction”).Thetruthisthis:theyareprogramsthatrespondautomaticallytorequests/queriesfromhumanusers.Butwherecanwefindthem?Inmanyfieldsorsectorsbutespeciallyininstantmessaging,forexample:Whatsapp,Telegram,Facebook,orMessenger.Itseemsthatwearetalkingaboutsomethingcomplicatedorverydifficult,however,evenweuserscancreateabotthatcanhelpusorotherstosimulateconversationsoractionsofthehumanbeinginordertomakeiteasieranactionortaskthatmayberepetitive.Nowithasbecome,inashorttime,afashionthatisspreadinginmanysectorsforitsversatility.Therealityisthattherearemanytypesofbots.Dependingonthesituationandourgoal,wewillchooseoneortheother.Butlet’sstartfromthebeginningandbeforethinkingabouthowtocreateabot,let’sseewhatabotisexactly.

  • 标签: BOT artificial intelligence(AI) human-computer interaction(HCI)
  • 简介:Serialgradesofcementmortarspecimenshavebeentestedonthemodelofcon-crete-liningflooddischargetunnelwithorifice,Theresultsshowthatincipientcavitationerosionnumberismuchsmallerthanincipientcavitationnumber.Basedontheprincipleofbubbledy-namics,theflowspeedeffectonincipientcavitationerosionnumberforcementmortarispre-sented.

  • 标签: CAVITATION EROSION ORIFICE BUBBLE DYNAMICS
  • 简介:Thispaperpresentsanexperimentalinvestigationonincipientmotionofnon-cohesiveuniformsedimentunderasteady-uniformstreamflowongeneralizedslopingfluvialbeds(combinedlateralandstream-wiseslope).Thecharacteristicparametersaffectingtheincipientmotionofsedimentparticles,identifiedbasedonthephysicalreasoninganddimensionalanalysis,arethethresholdshearstressratio(ratioofthresholdshearstressforslopingbedtothatforhorizontalbed),lateralslope,stream-wiseslopeandangleofreposeofsedimentparticles.Experimentswerecarriedoutintwoducts(closed-conduitflow)havingsectionofsemicircularinvertwiththreetypesofsediments.Inanopenchannelflow(laboratoryflumestudy),theuniformflowisadifficult,ifnotimpossible,propositionforasteeplyslopingchannelandisimpossibletoobtaininanadverselyslopingchannel.Toavoidthisproblem,thetestswereconductedwithaclosed-conduitflow.Equationofcriticalbedshearstressfortheinitialmovementofsedimentparticlesongeneralizedslopingbedswasobtainedusingtheexperimentaldata.

  • 标签: GRANULAR material Sediment FLUVIAL bed Incipient
  • 简介:Basedonaseriesofexperimentsunderbothice-coveredandfreesurfaceconditions,thepresentarticlediscussestheroleofflowvelocityandcriticalshearReynoldsnumberforincipientmotionofbedmaterial.Theinfluenceoftheresistancecoefficientsofboththeundersideoftheicecoverandthechannelbedonthelocationofthemaximumvelocityhasbeendiscussed.Inaddition,theimpactsoficeandcompositeresistancecoefficientsonflowvelocityforincipientmotionofbedmaterialhavebeenassessed.ThediagramdescribingthecriticalshearReynoldsnumberandthedimensionlessshearstressfortheincipientmotionofsedimentundericecoveredconditionswithdifferentundercoverresistancecoefficienthasbeenestablished.TheeffectsofgrainsizeondensimetricFroudenumberforincipientmotionofbedmaterialhavebeeninvestigated.ArelationshipbetweenthedensimetricFroudenumberforincipientmotionofbedmaterialandthemediangrainsizeofbedmaterialaswellastheroughnesscoefficientofchannelbedandroughnesscoefficientoficecoverhasbeenestablished.

  • 标签: 粒度 冰覆盖量 原始运动 电阻率
  • 简介:Multiscalesimulationsofthetiltedflat-endednanoindentationwithdifferenttiltedangles(from5?~30?)onthe(-110)surfaceofnickelcrystalwerestudiedusingtheQCmethod.Themodeloftheindentationisaflat-endindenterinclinedbyanangleεdrivenintoahalfplanevertically.Load-displacementresponses,initialstagesoftheplasticitydeformationsanddislocationemissionsfornickelfilmatdifferentinclinedangleswereobtainedandanalyzedaswell.Anenergycriterionwassuccessfullyproposedtoanalyzethecriticalloadforthefirstdislocationemissionbeneaththeedgeoftheindenter.Simulationresultsagreewellwithanalyticalones.AnelasticmodelbasedonthecontacttheoryandthePeierls-Nabarrodislocationmodelwerecombinedtoanalyzewhenandwherethedislocationwillbeemittedbeneaththelowersurfaceofaninclinedindenter.Resultsindicatethatthekeyparameteristheratioofthecontacthalfwidthtothepositionoftheslipplane.Thisparametershowstherangeinwhichadislocationwillprobablybeemitted.Thismechanismexplainsthesimulationresultswell.ThisworkisofvalueforunderstandingthemechanismofdislocationemissionsofFCCcrystalsundertiltedflatendednanoindentationwhileprovidingapproachestopredictingwhenthefirstdislocationwillbeemittedandwheresubsequentdislocationswillprobablybeemitted.

  • 标签: 纳米压痕 位错模型 多尺度 模拟 镍膜 可塑性
  • 简介:Basedon6-hourlysensibleheatfluxandlatentheatfluxfromtheNCEPClimateForecastSystemReanalysis(CFSR)andcirculationdatafromtheJapanese25-yearReanalysis(JRA-25),theinitialdevelopingprocessoftropicalcycloneMindulle(1005)in2010hasbeendiagnosedtorevealtheimpactofair-seainteractionovertheSouthChinaSea(SCS)onthegenesisofitsincipientvortex.TheresultsshowthattheincipientvortexfirstoccurredeastoftheLuzonIslandon0000UTC20August,suggestingthatthetopographicforcingoftheLuzonIslandforeasterlywindsoverthewesternPacificmightbeoneofthefactorsresponsiblefortheformationoftheincipientvortex.Duringtheformationstageoftheincipientvortex,strongsoutheasterliesovertheSCScausedwarmwaterofthemiddleandeasternSCStoflowtowardtheLuzonIslandduetoEkmantransportresultingfromwindstress,leadingtoanincreaseoftheseasurfacetemperatureandsensibleheatfluxintotheatmosphere.Althoughtheanomaloussensibleheatingfavoredsurfacepressuretoreduce,itwasnotconducivetotheincreaseoflocalvorticityassociatedwiththevortexabovetheheatingareabecause,accordingtotheatmosphericthermaladaptationtheory,theanticyclonicvorticitywouldbecreatedinthelowertroposphereduetothedecreasedverticalgradientofthesensibleheating.However,theascendingmotionsoccurredovertheeasternareaoftheanomaloussensibleheatingduetotheaugmentationofthevorticityadvectionwithincreasingheight,causingwatervaportocondenseinthemiddleanduppertroposphere.Inturn,cyclonicvorticitywasgeneratedinthelowertroposphereduetotheincreasedverticalgradientofthecondensationlatentheating,resultingintheformationandfurthergrowthoftheincipientvortex.Therefore,thevorticitycreationduetothecondensationheatingplayedadominantroleduringthesubsequentenhancingstageoftheincipientvortex.

  • 标签: TROPICAL CYCLOGENESIS AIR-SEA interaction incipient VORTEX