简介:InthesouthernpartofChina,duetotherichrainfallsandfavourablytopographicallandscape,thereisabundanthydraulicenergyresourcescontainedinthecountlesssmallstreamsandriversinthemountainousandsemi-mountainousareas.Besidesthesmallhydropowergenerationwhichtransfersthepotentialenergytotheelectricalpower,thereisothertechnologyavailabletoutilisethepotentialenergydirectlyforthewaterliftingintheirrigationanddecentraliseddo-mesticwatersupplyinthevillagelevel.Thispaperintroducesthebasicprincipleofthehydraulicramop-erationanddescribestheapplicableopportunitiesforthehydraulicram.
简介:Inpastterroristattacks,vehicleborneimprovisedexplosivedevices(VBIED)havebeentheprimarymannerofattackingbuildingsandinfrastructures.Preventingunauthorizedvehiclesfromapproachingaprotectedareawithanti-ramsystemswouldmaintainanestablishedstandoffdistanceagainstmovingandstationaryvehiclesandconsequentlyreduceblastanddebristhreats.Thisstrategyhasbeenconsideredthefirstlineofdefenceagainstterrorists.Severaltypesofanti-ramdeviceshavebeendevelopedinaccordancewithU.S.DepartmentofStateK-ratingcriteria,forexample,wedgebarriers,risingbeams,sliding/swinggates,anddroparms.However,thesedevicestypicallyneedadeepfoundationforinstallationandcan'tbeimplementedintomanylocationswhereadepthofexcavationislimitedinordertoprotectutilitylinesofbuildingsandinfrastructures.Thispaperpresentsarecentdevelopmentofaseriesofshallowfootinganti-rambollardsystems(SFABS)thatcansatisfyK-12ratingwithonlyfive-inchthickfooting.Ahigh-fidelityphysicsbasedfiniteelementtechniquewithavehiclecrashmodelisusedforpredictinganti-ramcapacityanddeterminingdesignparametersoftheSFABS.Full-scalevehiclecrashtestsofthedevelopedSFABSsystemshavebeencarriedouttovalidatethedesignandanalysis.
简介:摘要:为了使磁共振成像设备维护质量得到最好的控制,保证其在临床应用中的应用质量和安全性,需要进行可靠性、可用性和可维护性(RAM)的研究和分析。医学磁共振成像技术对医学的诊断有着重要的作用,不但可以提供高分辨率、层次分明的影像,而且可以帮助医师对病情的正确认识和及时的治疗。因此, 磁共振成像设备的良好运转状况对诊断和治疗起着举足轻重的作用。利用RAM进行磁共振设备的分析,可以为设备管理者提供优化操作、制定维修策略、维护管理等方面的决策依据。基于此,文章从磁共振仪器的日常维护与保养的重要性入手,对磁共振仪器的预处理进行了深入的分析,探讨了磁共振仪器的常见故障,并给出了相应的处理方法,为磁共振仪器的使用寿命提供了参考。
简介:Wearabledevicesbecomepopularbecausetheycanhelppeopleobservehealthcondition.Thebatterylifeisthecriticalproblemforwearabledevices.Thenon-volatilememory(NVM)attractsattentioninrecentyearsbecauseofitsfastreadingandwritingspeed,highdensity,persistence,andespeciallylowidlepower.Withitslowidlepowerconsumption,NVMcanbeappliedinwearabledevicestoprolongthebatterylifetimesuchassmartbracelet.However,NVMhashigherwritepowerconsumptionthandynamicrandomaccessmemory(DRAM).Inthispaper,weassumetousehybridrandomaccessmemory(RAM)andNVMarchitectureforthesmartbraceletsystem.Thispaperpresentsadatamanagementalgorithmnamedbraceletpower-awaredatamanagement(BPADM)basedonthearchitecture.TheBPADMcanestimatethepowerconsumptionaccordingtothememoryaccess,suchassamplingrateofdata,andthendeterminethedatashouldbestoredinNVMorDRAMinordertosatisfylowpower.TheexperimentalresultsshowBPADMcanreducepowerconsumptioneffectivelyforbraceletinnormalandsleepingmodes.
简介:【摘要】本论文设计了一种网络芯片软失效的快速恢复的方法,将复位拆分为硬复位,软复位,接口复位,外部存储控制器复位四种类型。硬复位控制芯片的配置信息的复位,软复位控制芯片的数据通路的复位,接口复位控制芯片的外部接口部分的复位,外部存储控制器复位控制外部存储控制器部分的复位。当网络通信芯片发生软失效时,配置单元上报给上位机,上位机仲裁是否需要复位芯片。当芯片工作在硬件自动识别模式时,复位管理单元自动仲裁是否需要复位芯片。当需要复位芯片时,保持硬复位和接口复位处在释放状态,将软复位和外部存储控制器复位设置到复位状态。这种复位配置,可以保留芯片的配置,保持和其他芯片连接的接口的连续性,并将发生异常的数据通路或外部存储控制器同时复位。解复位时,先释放数据通路的复位,让数据流在50ms内恢复。然后释放外部存储控制器复位,待外部存储可以正常访问后,打开数据流到外部存储的通路。
简介:摘 要:RAM双箱吊具用于岸边集装箱起重机装卸集装箱,中锁带有位置记忆功能,通过拉线位移传感器来实现双箱记忆功能。然而拉线位移传感器的拉线钢丝绳,存在寿命短,易损坏的问题;一旦损坏就需要更换拉线位移传感器总成,给部门的维修经费带来了不小的挑战,为此,公司技术人员通过技术攻关,开发出了一套拉线位移传感器的维修工艺,节约并降低了公司维修成本,保证公司生产作业效率。