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。
简介:InthesouthernpartofChina,duetotherichrainfallsandfavourablytopographicallandscape,thereisabundanthydraulicenergyresourcescontainedinthecountlesssmallstreamsandriversinthemountainousandsemi-mountainousareas.Besidesthesmallhydropowergenerationwhichtransfersthepotentialenergytotheelectricalpower,thereisothertechnologyavailabletoutilisethepotentialenergydirectlyforthewaterliftingintheirrigationanddecentraliseddo-mesticwatersupplyinthevillagelevel.Thispaperintroducesthebasicprincipleofthehydraulicramop-erationanddescribestheapplicableopportunitiesforthehydraulicram.
简介:摘要本文报道1例发生于老年女性口咽部双侧颈内动脉异位。患者女,71岁,因“咽部异物感伴打鼾1年”就诊。既往高血压病史。电子喉镜检查提示左侧口咽后壁稍隆起,右侧口咽后壁见局限性规律搏动性肿物。增强CT及CT血管造影提示双侧颈内动脉畸形,右侧向口咽正中移位,左侧向颈外侧移位,考虑双侧颈内动脉异位。综合考虑多方面因素暂未予以特殊治疗,进行充分健康宣教,并嘱患者定期门诊随诊。半年后门诊复查喉镜异位血管未见明显变化,一般情况良好。
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。