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The analytic solution of optimum low-thrust power transfer between arbitrary elliptical orbits using continuous constant acceleration is presented, based on the orbital elements selected.

研究航天器在小推力的作用下，椭圆轨道最优转移的一种解析解法。

Experimental synchronous rotor internal mixer and two kinds of 55L synchronous rotor internal mixer, consulted a number of published articles at home and abroad, then, for the first time, formed four kinds of physical model and the corresponding mathematical model which related to the mixed stock between the mixing chamber side and the top of the rotor wing, to the mixed stock between the two rotors and to the mixed stock at the various temperatures of the mixing chamber. And from the character of model, the author gave the relevant analytic solutions and finite element approximation arithmetic solutions during the experimental process of the synchronous rotor internal mixer.

因此，本文作者在XM—1.7实验用同步转子密炼机和两种50L同步转子密炼机上进行了大量的实验，并参阅国内外已发表的文献和资料，首次建立了同步转子密炼机混炼过程中，胶料在转子棱峰与密炼室壁之间、胶料在两同步转子之间和密炼室中混炼胶温度变化的四种物理模型及其相应的数学模型，并根据所建模型的特点，分别给出了相应的解析解或有限元数值解。

The differential equations that describe the artificial satellite motion are very complicated, and it is impossible to get the analytic express of solution.

描述人造卫星运动的微分方程非常复杂，不可能给出解的解析表达式。

To check up the analytic solutions, we calculate the N distributing of the heavy element of s-process in Solar System and the result is good agreement with astronomic measurement.

重元素的核合成中最重要的因素之一是中子源问题，稳定的中子源是重元素的核合成必要保证。

The uniformly valid asymptotic expansion of the solution to a class of time delay differential equations with damping term and general forcing term was obtained and a simple analytic approximate expression for the resonance solution was given.

对于一类带阻尼和一般力的时滞微分方程问题求得一致有效渐近展开式，给出了共振解筒洁的近似解析表达公式。

Studying the mean value of two Smarandache LCM Functions by using elementary and analytic method,and giving their asymptotic formula.

利用初等方法研究了两个包含Smarandache LCM函数的均值性质，并给出其渐近公式。

In this paper,we use elementary and analytic methods to study some problems on some special sequences and functions,and give their mean values,concisely counting formula and asymptotic formulae.

基于对上面所述问题的兴趣，本篇硕士论文利用初等及解析的方法研究了Smarandache教授提出的一些数论中的特殊序列及函数的性质，并且推广相关函数的结果，给出它们的均值计算公式和渐近公式。

In the forth Chapter, we study the mean value of properties of Smarandache factorial function and it s mean value, using analytic methods give several interesting asymptotic formula for the reciprocal of S_k function.

在第四章中，本文研究了Smarandache高阶乘函数的性质及其均值估计问题，利用解析的方法得到一系列的渐进公式。

Some methods mentioned in the elementary number theory and analytic number theory are used to consider the problems which are related with the Smarandache functions, then a conjecture and an asymptotic formula are given, a special equation is solved and Smarandache-Riemann sequences are generated.

本论文基于对Smarandache问题的学习与研究，运用了初等数论与解析数论中的一些研究方法，对与Smarandache函数相关的问题进行了简单的思考，给出了一个猜想，一个渐近公式，解决了一个特殊的方程，推广了Smarandache-Riemann序列。

Based on the excitation mechanics of evanescent-wave pumped WGM fiber laser and the analytic asymptotic formula to determine the resonant positions of a WGM,the observed experimental results are well explained.

根据消逝波激励的WGM光纤激光的激励机制，结合圆柱型微腔中确定WGM共振位置的解析渐近公式，合理地解释了观察到的实验结果。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"