简介:Asasubstitutefortheoriginaldisplacedpolegrids,asimplerotatedsphericalcoordinatesystemwasintroducedintotheCommunitySeaIceModelversion4(CSIM4),whichisacomponentoftheCommunityClimateSystemModel(CCSM)oftheAmericanNationalCenterofAtmosphericResearch(NCAR),todealwiththe'poleproblems'.Inthenewcoordinates,boththegeographicalNorthPoleandSouthPolelieinthemodelequatorandgridsizesnearthepolarregionaremoreuniform.WithreanalysisdatasetofAmericanNationalCentersforEnvironmentPrediction(NCEP)andLevitusdatasetwithoutconsideringsub-mixedlayerheatflux,themodelwasintegratedfor100yearswiththermodynamicsprocessinvolvedonlyintheformer49yearsandbothdynamicandthermodynamicprocessesinvolvedinthelefttime.Innerconsistencyofmodelresultswascheckedwithnocontradictionfound.Theresultsoflast10years'modeloutputwereanalyzedanditisshownthatthesimulatedseaiceseasonalvariationisrationalwhereasseaiceextentintheBarentsSeainwinterislargerthanthatofobservation.Numericalexperimentoninfluenceofsub-mixedlayerheatfluxwasalsocarriedoutanditisshownthatthesub-mixedlayerheatfluxcanmodulateseasonalvariationofseaicegreatly.Asamodelcomponent,theseaicemodelwithrotatedsphericalcoordinateswascoupledwithothermodels(theoceanicgeneralcirculationmodelistheLASG/IAPClimateSystemOceanModel(LICOM)withreducedgrid,othermodelsarecomponentsofNCARCCSM2)formingaclimatesystemmodelanditspreliminaryresultswerealsogivenbriefly.
简介:作为一种试验性的技术,它的需要在标本的温度在高温度裂口Hopkinson压力酒吧(SHPB)中是一致的,这试验。然而,当标本开始到时,在标本减少的温度和酒吧的温度增加与酒吧联系,它在标本导致不一致的温度分发,并且可以导致试验性的结果的不确。在这份报纸,当标本独自被加热时,在高温度SHPB实验的标本和酒吧的温度分布被调查。第一,标本的温度历史被实验在不同起始的温度测量,然后,模拟被执行。模拟结果与由调整在标本和酒吧之间的热接触系数的试验性的结果一致。由这样,热接触系数和模拟结果被验证,并且合适的冷接触在高温度SHPB实验标本和酒吧预定被讨论。最后,结果与在参考书的那些相比。
简介:AnewpelletinjectionsystemwasinstalledontheEASTtokamakandpreliminaryexperimentswereperformedduringthe2012runcampaign.TypicalphenomenaassociatedwithdeuteriumpelletinjectionintoaplasmadischargehavebeenobservedincludingsuddenincreasesoftheelectrondensityandHα/Dαemissionintensityaswellasasignificantdecreaseinplasmaelectrontemperature.ProfileshavebeenstudiedinordertounderstandtheinfluenceofpelletfuellingonEASTdischarges.Eventhoughtheinjectorwasspecificallydesignedforplasmafuelling,ELMtriggeringusingthepelletinjectionhasalsobeentested.InordertofindappropriateparametersfortriggeringELMsinH-modeplasmas,scanningofthepelletinjectionspeedwasemployedforpelletsinjectedfromboththehighfieldsideandlowfieldsideoftheplasmacolumn.Ithasbeenobservedthatlow-speedpelletsinjectedintoH-modeplasmafromthelow-fieldsidecouldtriggeranELMfollowedbyanumberofsmallerinducedELMsatabout300Hz.
简介:ThedevelopmentandmaintenanceofthecontrolsystemsofthefourLargeHadronCollider(LHC)experimentswillrequireanon-negligibleamountofresourcesandeffort.InordertominimisetheoveralleffortrequiredtheJointControlsProject(JCOP)wasset-upasacollaborationbetweenCERNandthefourLHCexperimentstofindandimplementcommonsolutionsforthecontroloftheLHCexperiments.ItisoneofthefewexamplesofsuchawidecollaborationandthereforetheexistenceoftheJCOPprojectisextremelysignificant.Thispaperwillgiveabriefoverviewoftheproject,itsstructureanditshistory.Itwillgoontosummarisethevarioussub-projectsthathavebeeninitiatedundertheauspicesofJCOPtogetherwiththeircurrentstatus.ItwillhighlightthattheJCOPgeneralprincipleistopromotetheuseofindustrialsolutionswhereverpossible.However,thisdoesnotruleouttheprovisionofcustomsulutionswhennon-standarddevicesorverylargenumbersofdeviceshavetobecontrolled.ThepaperwillalsodiscussthearchitectureforeseenbyJCOPandwhereinthisarchitecturethevarioustypesofsolutionsareexpectedtobeused.Finally,althouththeselectionofcommonindustrialandcustomsolutionsisanecessaryconditionofrJCOPtosucceed,theuseofthesesolutionsinthemselveswouldnotnecessarilyleadtotheproductionofhomogeneouscontrolsystems,Therefore,thepaperwillfinishwithadescriptionoftheJCOPFramework,whichisbeingdevelopedtopromotetheuseofthesecommonsolutions,toireducethedevelopmenteffortrequiredbythevariousexperimentdevelopmentteamsandtohelptobuildandintegratecontrolsystemswhichcanbemoreeasilymaintained.
简介:Inthispaper,acarangiformroboticfishwith4-DoF(degreeoffreedom)tailhasbeendeveloped.Theroboticfishhascapabilityofswimmingundertwomodesthatareradiocontrolandautonomousswimming.Experimentswereconductedtoinvestigatetheinfluencesofcharacteristicparametersincludingthefrequency,theamplitude,thewavelength,thephasedif-ferenceandthecoefficientonforwardvelocity.Theexperimentalresultsshownthattheswimmingperformanceoftheroboticfishisaffectedmostlybythecharacteristicparametersobserved.
简介:作为预报问题的数据吸收和整体的一条统一途径,整体Kalman过滤器(EnKF)被用来暴风雨整体预报在232007年5月30日期间在东亚指向一个灰尘事件调查灰尘的性能。输入风地,灰尘排放紧张,和干燥免职速度里的错误在重要模型不确定性之中并且在模型错误不安被考虑。这些模型错误没被假定有零工具。代表模型偏爱的模型错误工具作为数据吸收进程的部分被估计。从一个激光雷达网络的观察被吸收产生起始的整体并且改正模型偏爱。整体预报技巧与观察和一张基准/控制预报被作比较,没有任何观察的吸收,它是简单模型跑。没有模型偏爱修正,另一个整体预报实验也被执行以便检验偏爱修正的影响。结果证明整体平均数,确定的预报在控制上有实质的改进预报并且正确地捕获在每个观察地点预定的主要灰尘到达和停止。然而,当预报铅时间增加,预报技巧减少。偏爱修正进一步改进了预报在在风区域下面。在24个小时以内的预报最被改进并且比那些好没有偏爱修正。用操作典型曲线和区域的荆棘分数和亲戚的整体预报技巧的考试显示预报系统的整体有有用预报技巧。
简介:Thispaperanalyzestheadvantagesanddisadvantagesoftwotechni-callinesforautomaticgroupgeneralizationofcontourlines.Theauthorsuggeststhatitispossibletogetfasterandbettergeneralizationresultsifwesimulatetheintelligenceofhumanexpertsinprogramdesigning,retrievegeomorphologicalstructuralinformationusingtheinputdataof2-Dcontourlinesandderiveandoutputthegeneralied2-Dresultsdirectly.
简介:Thedistributioneffectofelectricfieldonthealignmentandattachmentofcarbonnanotubes(CNTs)wereinvestigated.Theexperimentalresultswerecomparedwiththesimulationresultsaccordingtothreedifferentshapedelectrodes.Inprevioussimulation,theroundshapedelectrodeswereexpectedtobemoreeffectiveforaligningandattachingasingleCNTbetweentwoelectrodesthanconicalorrectangularshapedelectrodes.Toverifythesimulationresults,threedifferentshapedelectrodeswereintroducedandasinglemulti-walledcarbonnanotube(MWNT)wasattached.TheoptimalconditionsforaligningandattachingMWNTssuchasthefrequency,appliedvoltageandconcentrationofMWNTssolutionwereinvestigated.Throughrepeatedexperiments,frequencyof100kHz-10MHz,appliedvoltageof0.3-1.3Vrms/μm,concentrationof5μg/mLinMWNTssolutionwereobtainedasapossibleconditionrangetoattachMWNTs.Undertheseconditions,theyieldofMWNTsattachmentbetweentwoelectrodeswasupto70%.Inprevioussimulation,furthermore,itwasverifiedthatthesizeofthestableorquasi-stableregionmadeCNTsalignedandattachedondifferentshapedelectrodesfromthecomparisonoftheexperimentalandsimulationresults.MostsingleMWNTattachmentwasaccomplishedontheroundshapedelectrodes.
简介:Thispaperbrieflyreviewedtheresearchprogressesofearthquakepredictionand/orforecastinginChinaduring1999~2002,especiallyfocusedonmid-shorttermpredictionmethodswithapproachesofseismicity,crustaldeformation,electromagnetism,groundwaterandtheanalysisbysynthesis,andtheapplicationofthemethodstothepracticeofearthquakeprediction.
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简介:Inthispaper,weuseatwo-dimensionalprimaryequationmodelwhichcontains(1)heatingofradiation,(2)heatingofcondensation,and(3)transfersofsensibleandlatentheatbetweenairandtheunderlyingsurface.ToinvestigatethecausesfortheformationoftheeasternNorthPacificsum-mermonsoon,thedataat110°Wareobtainedandwindsatunderlyingsurfaceandat200hPaaremodifiedundertheconditions(1)removingtopographyand(2)changingmeridionalseasurfacetem-perature(SST)gradient.Inthenumericalmodification,wefindthatbyremovingthetopography,thecenter’slocationoftheeasternNorthPacificsummermonsoondoesnotchange,buttheintensityofthesummermonsoonisweakened.AlsotheonsetofthesummermonsoonisdelayedtotheendofMay.Thetropicaleast-erlyjetisweakenedobviously,evenchangestowesterlywind.Ontheotherhand,wefindthattheSSTgradientalong110°WinfluencestheeasternNorthPacificsummermonsoondistinctly.IftheSSTgradientisdecreased,thecenterofthesouthwestwindnear12°Ndoesnotexistanymore.theintensityofthewholesummermonsoonbecomesveryweakandthecirculationpatternofthesummermonsoonalsochangesalot.Finally,weindicatethatbothtopographyandmeridionalSSTgradientplayimportantrolesintheoccurrenceoftheeasternNorthPacificsummermonsoon.ThemeridionalSSTgradientisthemostimportantfactorthattriggersthesummermonsoonandthetopographyalong110°Winfluencestheintensityandtheonsettimeofthesummermonsoontheremostly.
简介:ThedevelopmentandmaintenanceofthecontrolsystemsofthefourLHCexperimentswillrequireanon-negligibleamountofresourcesandeffort.TheJointControlsProject(JCOP)[1]hasbeenset-upasacollaborationbetweenCERNandthefourLHCexperimentstofindcommonsolutionsfortheLHCexperiments'controlsystems.AlthoughtheJCOPgeneralprincipleistopromotetheuseofindustrialssoluitionswhereverpossible,customsolutionsarestillrequiredwhennon-standarddevicesorverylargenumbersofdeviceshavetobecontrolled.Furthermore.toeasethedevelopmentandintegrationofbothstandardandnon-standarddevicesintothecontrolsystemanumberofsoftwareFrameworksareunderdevelopment.ThispaperwilldescribethevarioussolutionsbeingproposedbyJCOPincludingtheSupervisoryandFront-Endframeworksaswellasthevariousindustrialandcustomcomponents.Inaddition,ItwillalsodescribewherethesefitintotheforeseenJCOPcontrolsarchitecture.ThepaperwillthenhighlightinmoredetailtheFront-EndFramework.
简介:Wepresentasetoftoolsandgeneral-puposeapplicationsforthesimulationofastrophysicsandastroparticleexperiments,concerningbothphysicsandradiationbackgroundstudies.Theyaddrssthespeificrequirementsofvarioustypicalastroparticledetectors:new-generationX-andγ-raydetectorsonsatellites,undergrounddetectorsforastroparticleexperimentsandsolarsystemexplorations.
简介:Underwatergliders,whichglidethroughwatercolumnsbyuseofapairofwings,areefficientlong-distance,long-durationmarineenvironmentobservatoryplatforms.TheSea-Wingunderwaterglider,developedbytheShenyangInstituteofAutomation,CAS,isdesignedfortheapplicationofdeep-seaenvironmentvariablesobservation.Thesystemcomponents,themechanicaldesign,andthecontrolsystemdesignoftheSea-Wingunderwaterglideraredescribedinthispaper.Thepitchandrolladjustingmodelsarederivedbasedonthemechanicaldesign,andtheadjustingcapabilitiesforthepitchandrollareanalyzedaccordingtothemodels.Fieldexperimentshavebeencarriedoutforvalidatingtheglidingmotionandtheabilityofmeasuringoceanenvironmentvariables.Experimentalresultsofthemotionperformancesofthegliderarepresented.