简介：生活质量的提高使我们逐渐意识到生存环境的重要性；一个良好、优雅的氛围会让你产生灵感，激发创造快乐生活的动力。

简介：学校鼓励提倡理科教师根据学校条件,修理或改制一些老旧仪器,以适应教学的需要。同时,提出了这方面的工作程序和方法。实验室,无论新与老,都应根据需要而改变。

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简介：Thedistributedcomputersystemdescribedinthispaperisasetofcomputernodesinterconnectedinaninterconnectionnetworkviapacket-switchinginterfaces.Thenodescommunicatewitheachotherbymeansofmessage-passingprotocols.Thispaperpresentstheimplementationofrendezvousfacilitiesashigh-levelprimitivesprovidedbyaparallelprogramminglanguagetosupportinterprocesscommunicationandsynchronization.

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简介：However,itisagreatpitythatinmanyplaces,someofthepublicfacilitieshavebeenpurposelydamaged.Someelectricbulbsweresmashed;sometrafficsignsweredamagedbeyondrecognition,somepublictelephonescannotwork;somestatuesstandtherewithoutanarmoraleg.What'sworse,somepeopleevenstolethecoversofthesewers.

简介：Beampositioningstabilityinalaser-driveninertialconfinementfusion(ICF)facilityisavitalproblemthatneedstobefixed.Eachlaserbeaminthefacilityistransmittedinlotsofopticsforhundredsofmeters,andthentargetedinamicro-sizedpellettorealizecontrollablefusion.Anyturbulenceintheenvironmentinsuchlong-distancepropagationwouldaffectthedisplacementofopticsandfurtherresultinbeamfocusingandpositioningerrors.Thisstudyconcludedthattheerrorsoneachoftheopticscontributedtothetarget,anditpresentsanefficientmethodofenhancingthebeamstabilitybyeliminatingerrorsonerror-sensitiveoptics.Optimizationsoftheopticalsystemandmechanicalsupportingstructuresarealsopresented.

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简介：Inthispaper,wereviewthestatusofthemultifunctionalexperimentalplatformattheNationalLaboratoryofHighPowerLaserandPhysics(NLHPLP).Theplatform,includingtheSG-IIlaserfacility,SG-II9thbeam,SG-IIupgrade(SG-IIUP)facility,andSG-II5PWfacility,isoperationalandavailableforinterestedscientistsstudyinginertialconfinementfusion(ICF)andabroadrangeofhigh-energy-densityphysics.Thesefacilitiescanprovideimportantexperimentalcapabilitiesbycombiningdifferentpulsewidthsofnanosecond,picosecond,andfemtosecondscales.Inaddition,theSG-IIUPfacility,consistingofasinglepetawattsystemandaneight-beamnanosecondsystem,isintroducedincludingseverallasertechnologiesthathavebeendevelopedtoensuretheperformanceofthefacility.RecentdevelopmentsoftheSG-II5PWfacilityarealsopresented.

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简介：TheConductorandHardwareResearchDivisionoftheElectricPowerConstructionResearchInstitute,MinistyofEnergy,isascientificresearchandtestbaseforstudyofmechanicalpropertiesoftransmissionlineconductorandhardwareinChina,whichhasahistoryof32yearslong.TheDivisionnowpossessesastaffofabout20,including5seniorengineersand5engineers.TheDivisionpossessesalsoalab,itmainlydealsWiththetestandre-

简介：Ahybridcontrolplatformisinvestigatedinthispapertomitigatemicrovibrationstoagroupofvibrationsensitiveequipmentinstalledinamicroelectronicsfacilitysubjecttonearbyroadvehicle-inducedhorizontalandverticalgroundmotions.Thehybridcontrolplatform,onwhichmicroelectronicsequipmentisinstalled,ismountedonabuildingfloorthroughaseriesofpassivemountsandcontrolledbyhydraulicactuatorsinbothhorizontalandverticaldirections.Thecontrolplatformisanelasticbodywithsignificantbendingmodesofvibration,andasub-optimalcontrolalgorithmisusedtomanipulatethehydraulicactuatorswithactuatordynamicsincluded.Thefiniteelementmodelandtheequationsofmotionofthecoupledplatform-buildingsystemarethenestablishedintheabsolutecoordinatetofacilitatethefeedbackcontrolandperformanceevaluationoftheplatform.Thehorizontalandverticalgroundvibrationsatthebaseofthebuildinginducedbynearbymovingroadvehiclesareassumedtobestationaryrandomprocesses.Atypicalthree-storymicroelectronicsbuildingisselectedasacasestudy.Thecasestudyshowsthattheverticalvibrationofthemicroelectronicsbuildingishigherthanthehorizontal.TheuseofahybridcontrolplatformcaneffectivelyreducebothhorizontalandverticalmicrovibrationsofthemicroelectronicsequipmenttothelevelwhichsatisfiesthestringentmicroscalevelocityrequirementspecifiedintheBoltBeranek&Newman(BBN)criteria.

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简介：Thisarticle,bycomparingthebasicconceptsofsubstrateandsoil,theircompositionofsubstanceandmethodsofmeasuringtheindexesofphysicalandchemicalproperties,analyzesandresearcheswaysofchoosingsubstrateforcultivationwithfacilities.Itindicatesthatthenormalphysicalandchemicalindexesofevaluatingasubstratearebulkdensity,totalporosity,non-capillaryporosity,ratioofbigporositytosmallporosity,thepHandtheelectricalconductivity(EC)valueofthesubstrate.By...

简介：Anumberoflaserfacilitiescomingonlineallovertheworldpromisethecapabilityofhigh-powerlaserexperimentswithshotrepetitionratesbetween1and10Hz.Targetavailabilityandtechnicalissuesrelatedtotheinteractionenvironmentcouldbecomeabottleneckfortheexploitationofsuchfacilities.Inthispaper,wereportontargetneedsforthreedifferentclassesofexperiments:dynamiccompressionphysics,electrontransportandisochoricheating,andlaser-drivenparticleandradiationsources.Wealsoreviewsomeofthemostchallengingissuesintargetfabricationandhighrepetitionrateoperation.Finally,wediscusscurrenttargetsupplystrategiesandfutureperspectivestoestablishasustainabletargetprovisioninfrastructureforadvancedlaserfacilities.

简介：我们认为连续评论容易腐烂(s，S)有由有限能力和一个单身的服务者的一个等待的大厅组成的一台服务设备的库存系统。我们假定顾客的二种类型，平常、否定，根据一个Markovian到达过程(地图)到达。Anordinary顾客加入队列，一个否定顾客把一个平常的顾客从队列移开而不是加入队列。在这篇论文采用的移动规则是RCE(从结束的一个顾客的移动)。单个顾客的单位需求在被假定有阶段类型分布的服务的一随机的时间以后满足。每个项目的生活时间和reorders的铅时间被假定是独立指数的分布。在系统和库存水平的顾客的数字的Thejointprobability分发为稳定的州的盒子被获得。各种各样的静止系统性能措施被计算，全部的期望的费用率是计算的。结果数字地被说明。

简介：220-kVandaboveclasstransmissionandsubstationfacilitiesIn2005therewere325supplyenterprises(including29EHVtransmissionandsubstationenterprises)and221generationenterprisesalloverthecountry.Mainreliabilityindexesof13kindsoftransmissionandsubstationfacilitiesin2004and2005areshowninTable1.Itcanbeenseenthatthereliabilityindexesin2005remainedatahighJevel,andtheiravailabilityfactorcameuptoover98%.Thisembodiedthattheenterpriseswerestillabletoputthereliabilitymanagementworkinthe

简介：Takingpublictransitfacilities(PTFs)isthemajortransportstyleinHongKong.Humanexposuretoindoorairpollutantsmaycauseadversehealtheffectstothepassengers.Exposureassessmentonairpollutantsisimportantforthecontrolofhumandiseasescausedbyindoorairpollution.Inthispaper,theindoorPM10,COandCO2levelsinvariousPTFs,suchaspublicbus,subway,railwayandferryinHongKong,weremea-sured.CombiningwiththetimebudgetsurveyofHongKongpopulation,thehumanexposureswerecalculatedthroughMonte-Carlosimulation.