A general four-layer structure linear theory for predicting the effects of arbitrarilydistributed roughness change on the variations of wind speed and shear str
In this paper,the problem of evolution of slowly,modulated wave train on porous seabed is investigated with the method of multiple scales.For the sea water in t
In this paper,we have proved several theorems which guarantee that the Lienardequation has at least one or n limit cycles without using the traditional assmupti