An epidemic SIS model whose coefficient is almost periodic functions is studied. A sufficient condition of existence and uniqueness of positive periodic solution is obtained.
对系数是概周期函数的传染病s IS模型进行了研究，得到了概周期解存在惟一的一个充分条件。
By the discretization of spatial variable in the equation, a third-order differential system of equations containing periodic time-varying coefficient is derived.
采用微分求积法对方程中的空间变量进行离散，得到仅含有时间变量的三阶周期系数微分方程组。
The reflection coefficient for a periodic structure computed by this method is in good agreement with the result calculated by the propagating matrix method.
应用该方法分析了一种周期性结构的反射特性，与用传播矩阵方法所得结果一致。
Because of the meshing stiffness of a gear pair, the governing equation denotes a linear dynamic system with periodic time-varying coefficient.
由于齿轮副啮合刚度的影响，动力学方程序代表了一个具有时变系数的线性动力系统。
The statistic of wavelet transform coefficient algorithm can solve the periodic noise, high-energy noise and some non-Gauss noise simply and effectively;
统计算法在解决周期信号、高能噪声和高斯信号方面有独特之处，能简单有效提取以上噪声的特征；
Riptide's periodic healing coefficient has been increased by 50%. The initial direct heal is unchanged.
激流的持续性治疗效果增加50%，直接治疗不变。
Riptide's periodic healing coefficient has been increased by 50%. The initial direct heal is unchanged.
激流的持续性治疗效果增加50%，直接治疗不变。
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