上微分

Partial differential equation is widely used in problems of science and engineering.

偏微分方程在科学和工程上有着广泛的应用。

The analysis of the characteristics of the switch process of the jet elements is presented,and the math model of jet elements was constituted in the form of nonlinear differential equations.

在对射流元件切换过程进行分析的基础上，建立了射流元件非线性微分方程组形式的动态数学模型。

On the basis of analyzing and summarizing the work of modern epidemic research, considering the impulsive vaccination this article constructs models with the form of impulsive differential equations.

在分析和总结当代流行病研究的基础上，本文考虑了实施脉冲疫苗策略对其的作用和影响，建立了脉冲微分方程形式的流行病传播数学模型。

Further more, this dissertation studies pricing strategy of firms that compete to each other in monopolist competitive or oligopoly competitive market, builds up a differential game model, and proposes Nash-equilibrium steady solution.

本文还在已有的消费者对品牌价值判断模型的基础上，提出了不完全竞争市场条件下，竞争企业之间的定价优化微分对策模型，并给出了Nash-均衡稳态解。

We studied also the differential geometry of complex vector bundles.

我们还研究了复向量丛上的微分几何。

This paper presents a path-planning method based on differential evolution algorithm.

本论文在分析了目前各种路径规划方法优缺点的基础上，提出了一种基于微分进化算法的机器人路径规划方法。

In the third chapter, we discussed the problem about partial differential equation with small parameter on the high-order item.

第三章主要对小参数在高阶项的偏微分方程进行讨论，也就是一般意义上的边界层问题。

Topology is traditionally decomposed into three parts: General topology, Algebraic topology and Differential topology.

习惯上拓扑学被分成点集拓扑、代数拓扑和微分拓扑三部分。

This paper have also explored the nonwandering property of sum of operator, direct sum of operator,tensor products of operators and differentiation operators which can be viewed as weighted shifts on some space.

本文也研究了和算子，直和算子，张量积算子以及在某种意义下可看成加权移位的微分算子在一定空间上的非游荡性。

Firstly, we investigate the Dirichlet problems comparison principle on a bounded subset for this fully nonlinear intergro-differential equation, at the same time we must assume the measure in the intergro-differential item is absolute continuous.

首先研究这类完全非线性积分微分方程在有界区域上Dirichlet问题的比较原理，此时须假设积分项所涉及的测度是绝对连续的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。