如果一个复杂的函数具有高阶可微性，那么这个函数在定点处可以用密切二次曲线来逼近。这里给出了高阶可微函数在定点处的相关标准型......

将2011年至2016年乐平市共产主义水库水质监测值与地表水环境质量标准相结合，建立了环境样本矩阵，通过引进目标差值率法及熵权法对传......

Since reform and open to the outside world,foxtail millet planting area in Hebei Province has constantly reduced,and its......

An analytical theory for calculating perturbations of the orbital elements of a satellite due to J2 to accuracy up to fo......

Now we use the Jacobian integral of circular restricted three-body problem toestablish a testing function of the stabili......