简介:摘要针对当前发电生产形势,燃煤火力发电机组频繁调峰调停的常态;发电厂对停备机组进行设备消缺检修,和停备机组随时满足电网调度快速启动并网要求之间的矛盾问题逐渐显现而日益突出。停备机组检修工作许可管理的创新研究和实施,很好解决了之间的矛盾。
简介:Thecentralnervoussystem(CNS)containsthetwomostimportantorgans,thebrainandspinalcord,fortheorchestrationofthementalandphysicalactivitiesoflife.Becauseofitsimportance,thehumanbodyhasevolvedbarriersystemstoprotectCNStissuefromtheexternalenvironment.Thisbarrierisamembranecomposedoftightlyapposedcellsandisselectivelypermeabletospecificmoleculesbywayofmembranetransporters.Themajorbarriersinthebrainandtheircorrespondingcellularconstituentsarethebloodbrainbarrier(BBB)composedofendothelialcellsinbrain