Distribution of tracer gas is very important in leak detection.In order to test leak exactly,a leak model of Helium in g......

In inflation the influence of short wave part of scalar field on the long wave is considered to be a nature of a random ......

利用微分递推关系异开行得在引力场中的束缚运动轨道方程，证明了其延关于极值点的角对称性，并引用欧拉极限定量，求解了其周期。该方法......