Optimal control is an important field in the modem control theory and technology and is one of the frontiers of nowaday science and technology. Since the 1950s, rapid development of space technique raises high demand ...
A pulsar, PSR 1937+214, with rotational frequency of 642 Hz was newly discovered by Arecibo Observator in Puerto Rico in November, 1982. It has the fastest rotational frequency among all the found pulsars. The discove...