简介：Thispaperintroducesthemainpointsofdesignandoperationfeaturesofacurvedcombinativebreakwaterwallwhichcannotonlyresiststormsurgebutalsorollwavebackandwhichhasthefunctionsofseawall,tideprotection,anti-wave,landdevelopment,trafficandtourism.ThenewkindofbreakwateroptimizedbywavemodeltesthasbeenutilizedintheseawallinthecoastregulationprojectinZhanjiangCity,andgoodresultshavebeenachieved.

简介：Inordertosearchforthemeasuretoincreasetheenergydissipationratioofsteppedspillways,somemaininfluencingfactorsfortheenergydissipationratioofsteppedspillways,suchasunitdischarge,damslope,heightofstepandsoon,werestudied.Theresultsshowthattheenergydissipationratiodecreaseswiththeincreaseintheunitdischargeandincreasesastheslopebecomesgentle.Theeffectsofstepheightontheenergydissipationratioarecloselyrelatedtounitdischarge.Iftheunitdischargeissmaller,thechangeofenergydissipationratiowithstepheightbecomesgreater.While,iftheunitdischargeisgreater,theinfluenceofstepheightonenergydissipationratioisverylittle.Accordingtothedistributionsoftheturbulencekineticenergyandturbulencedissipationrateobtainedbynumericalsimulation,thebasicreasonofthedecreaseofenergydissipationratiowiththeincreaseintheunitdischargewasdiscussedandsomespecificmeasurestoincreasetheenergydissipationratioweresuggested.

简介：Asoneofthemostimportantdevelopmentsinaircoolingtechnologyforhotpartsoftheaero-engine,filmcoolingtechnologyhasbeenwidelyused.Filmcoolingholestructureexistsmainlyinareasthathavehightemperature,unevencoolingeffectivenessissueswheninactualuse.Thefirststageturbinevanesoftheaero-engineconsumethelargestportionofcoolingair,therebytheresearchonreducingtheamountofcoolingairhasthegreatestpotential.Anewsteppedslotfilmcoolingvanewithahighcoolingeffectivenessandahighcoolinguniformitywasresearchedinitially.Throughnumericalmethods,theaffectingfactorsofthecoolingeffectivenessofavanewiththesteppedslotfilmcoolingstructurewereresearched.Thispaperfocusesonthecoolingeffectivenessandthepressurelossindifferentblowingratioconditions,thenthemostreasonableandscientificstructureparametercanbeobtainedbyanalyzingtheresults.Theresultsshowthat1.0mmistheoptimumslotwidthand10.0isthemostreasonableblowingratio.Underthiscondition,thevaneachievedthebestcoolingresultandthehighestcoolingeffectiveness,andalsoretainedalowpressureloss.

简介：Thestructuralparametersoflow-steppedmirrorwhichisthecorecomponentofalightFouriertransforminfraredspectrometer(FTIRS)haveimportantinfluenceontheperformanceoftheinstrument.Asimplemethodofmultipledepositionisproposedtofabricatealow-steppedmirrorwithstepheightof625nm,foritshighprecision,highefficiencyandminiaturization.Sothefilmstresswillbeintroducedintheprocessofcoating,whichcanleadtostepdeformation.Webuildabendingmodelofthelow-steppedmirrorandanalyzetheinfluenceofitsdeformation.Thelightintensityandspectrumarechangedbythestepdeformation.Therefore,thefilmstressshouldbereducedinordertoensuretheaccuracyofthespectralinformation.Increasingthethicknessofsubstrateis.proposedinthispapertoreducethestepdeformation,besidesadjustingthecoatingtemperatureandaddingsub-layer.Ourresultsrevealthatthebasicrequirementsofthesystemaresatisfiedwhenthethicknessofthesubstrateis5mmintheappropriatecoatingenvironment.AnFTIRSbasedonsteppedmirrorsandgridbeamsplitterisassembledandcorrespondingexperimentiscarriedouttoobtainthespectrumcurveofacetonitrile.

简介：Steppedfrequencysignalisoftenusedtosynthesizehigh-resolutionrangeprofile,butredundanthigh-resolutionrangeprofileexistsbeforesynthesis.Twomethodshavebeengiventoextracttargetfromoverlappedhigh-resolutionrangeprofileandanalyzedtoshowhowspuriouspeaksappear.Thispaperprovidesareverse-countalgorithmtoresolvetheproblemofspuriouspeaksformovingtarget.Thisproposedmethodselectsthepeakwithmaximumamplitudeastheextractedtargetandgetsitspositionbyusingthenumberofsamplesprcedingbeforethepresentsamplepositionandthenumberofhigh-resolutionrangecellofthetarget.Thisproposedmethodiscomparedwiththealreadygivenmethodandtheresultshowstheabilityoftheproposedmethodtoremovespuriouspeaks,itprovidesthefoundationforhigh-resolutionrangeprofile.

简介：Asawidelyusedfloodenergydissipator,thesteppedspillwaycansignificantlydissipatethekineticorhydraulicenergyduetotheair-entrainmentinskimmingflowoverthesteps.Thefree-surfaceaerationinvolvesthesharpdeformationofthefreesurfaceandthecomplexturbulentshearflows.Inthisstudy,thevolumeoffluid(VOF),mixture,andEulerianmethodsareutilizedtosimulatetheair-entrainmentbycouplingwiththeReynolds-averagedNavier–Stokes/largeeddysimulation(RANS/LES)turbulencemodels.Thefreesurfacedeformation,airvolumefraction,pressure,andvelocityarecomparedforthethreedifferentnumericalmethods.OnlytheEulerian+RANSmethodfailstocapturethefree-surfaceaeration.TheairvolumefractionpredictedbytheVOF+LESmethodbestmatchestheexperimentalmeasurement,whilethemixture+LESmethodpredictstheinceptionpointoftheairentrainmentmoreaccurately.

简介：Inthiswork,weperformanumericalstudyofawaterflowoverasteppedspillway.ThisflowisdescribedbytheReynoldsaveragedNavier-Stokesequation(RANS)associatedwiththeturbulencek-εmodel.Theseequationsaresolvedusingacommercialsoftwarebasedonthefinitevolumeschemeandanunstructuredmesh.Theair-waterflowwasmodeledusingvolumeoffluid(VOF)andmultiphasicmethods.Thecharacteristicsoftheflowwereinvestigatedincludingthetotalpressure,thevelocityprofile,etc..Weanalyzetheeffectsontheflowstructureofthestepsandcountermarchinclination,theairinjectionthroughthecountermarchintothewaterflowandthedynamicswaterdischarges.Resultsshowthattheinclinationofthecountermarchrelativetotheverticalandtheairinjectionintothewaterflowincreasethetotalpressureintheneighbourhoodofthesteps.

简介：称为走的墙框架结构的一个新结构的系统在这研究被建议解决产出RC框架的问题的底部，它广泛地在中国发生在象Wenchuan和Yushu地震那样的以前的地震期间。平常的RC框架模型和一个走的墙框架建模的A1/5规模被使遭到一起摇桌子运动学习新结构的系统的地震行为。这份报纸在低、中等、高的紧张摇晃下面论述动态特征，地震回答和失败和二个模型的倒塌机制。测试结果和进一步的分析证明走的墙框架结构的地震表演以控制得好的变丑模式和更一致地分布式的损坏比平常的RC框架优异。走的墙能有效地压制产出机制的底部，并且为设计实践简单、节俭、实际。

简介：OnJune2011,theBeijingResearchInstituteofUraniumGeology,anInstitutewithintheChinaNationalNuclearCorporation(CNNC),andtheDepartmentofGeology&MiningCNNCcarriedoutaprojectScientificDrillingforDeepMetallogenicResearchintheXiangshanLargeUraniumOreField.AyearlateronJune21,theproject,representingthefirstscientificdrillingofChina’suranium,wasofficiallylaunched,andsuccessfullycompletedonJune17,2013.A2818.88mofdrillingdepthhasbrokenthepreviousrecord1200mofexplorationdepth.TheXD-35DBdrillingmachinedevelopedbyChinaGeo-EquipmentCorporationistheChina’sfirstAC-VFDDirectDriveTopDriveCoreDrill.Ithasgreatlyimproved

简介：Basedonrigid-plasticfiniteelementmethod,askewrollingprocessofsteppedpartissimulated.Consideringnodesavingandeffectiveremeshing,thetetrahedronsolidelementsareusedtodiscreteworkpiece.Theworkpiecematerialadoptsrigid-plasticmodel,wheretheflowstressisfunctionofeffectivestrain,effectivestrainrateandtemperature.Thethermomechanicalcouplingisconsideredinthesimulation.Tomodelthespinningworkpieceundergoingplasticdeformation,anovelsolutionispresentedandappliedinthispaper.Thestressstateintheworkpieceandformingcharacteristicofskewrollingareanalyzed.Theformingload,includingrollertorqueandforcesinthreedirectionsarepredicted.Theaboveanalysesarehelpfultounderstandingofformingmechanismsandimprovingofprocessanddiedesign.