二阶法 meaning in English

second-order method

There are two methods to realize the function of the switched capacitor filter : dual - two order method and z - domain method . this thesis emphasizes to introduce the two methods and realize the functions with the two methods
开关电容滤波器的实现方法主要有两种：双二阶法和z域法，本文着重介绍了这两种实现方法并分别用这两种方法对开关电容滤波器的功能进行了实现。
This paper uses compare principle to show that there exists at most one of classical solution for ( 1 ) , while the existance of solution is obtained through continuous method . to get the required a priori estimates except the double normal derivatives , we adopt the method in [ 3 ] , and the double normal derivatives on dq are achieved by barrier constructions and applying skill of [ 2 ]
本文用比较原理证明了问题( 1 )至多存在一个古典解，应用连续性方法，得到了问题( 1 )古典解的存在。在得到所需的先验估计时，利用了[ 3 ]中的方法建立了除去边界二阶法向导数外的先验估计，通过构造闸函数，用[ 2 ]中的技巧得到在边界(