斯卡克的护边情结

8月1日，斯卡克从毡房出来，骑上那匹跟随他一同护边多年的骏马，要到新疆军区边防某连同那里的官兵们一起巡边、护边。

斯卡克:义务守边终不悔

在美丽的米尔其克草原上，流传着一位哈萨克族牧民斯卡克与边防官兵共同守边的感人故事。

The Estimation of the Number of Zeros of the Abelian Integrals for a Class of Hamiltonian Systems

In this paper, we discuss the estimation of the number of zeros of the Abelian integral for the quadratic system which has a periodic region with a parabola and a straight line as its boundary when we perturb the system inside the class of all polynomial systems of degree n. The main result is that the upper bound for the number of zeros of the Abelian integral associated to this system is 3n-1.