本文获得了一阶正负周期系数的中立型微分差分方程振动的充分条件。

Some sufficient conditions are obtained for the oscillation of first order neutral differential-difference equations with positive and negative periodic coefficients.

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对方程组的周期系数处理以及前飞时的相关参数对旋翼动稳定性的影响等进行了研究。

The treatment of equations with periodic coefficients and the influence of related parameters on rotor dynamic stability were investigated.

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利用单调方法讨论了一类含时滞及周期系数的反应扩散系统的竞争-竞争-互惠模型。

By using the monotone method, a periodic reaction diffusion system of a competitor-com - petitor-mutualist is investigated.

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