Each observation station in the VLBI has an independent hydrogen clock.In particular,on rare occasions the phase lock sy......

Energy management is facing new challenges due to the increasing supply and demand uncertainties,which is caused by the ......

提出一种基于刚度分段线性动力吸振器的振动半主动控制方案，通过调节弹性元件的间隙使吸振器工作频率跟踪外激励频率的变化。根据基......