In this article the notion of quasi-symmetry is introduced.It is proved that the quasi-symmetry is equivalent to the uni......

The authors investigate the α-transience and α-recurrence for random walks and Levy processes by means of the associat......

采用数值模拟和水模型实验相结合的方法研究了不同控流方案下非对称两流中间包内流体流动行为，并将优化方案进行了工业实验．实验结果......

Perturbation to Noether quasi-symmetry and adiabatic invariants for the nonholonomic system on time scales are studied. ......