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After that, the important equation for calculating reverberation time is given based on the definition of reverberation time and least squares method. Finally, we use our new method to calculate reverberation time in a rectangular enclosure; we also compare our results with those given by experiment and Sabine's equation. The comparison shows that the new method is more effective and accurate than Sabine's equation in calculating reverberation time of small enclosures.

给出了描述小尺度封闭空间内声场的有限元模型；在该模型的基础上推导了计算小尺度封闭空间内混响时间的方法，并编制了相应的计算机程式；在算例部分，计算了一矩形封闭空间内的混响时间，通过与实验结果进行比较，验证了这一方法的正确性。

Then, a Visual C++ program named Sailing Program is written to do following works: to calculate the parameters of rhumb line and great circle line ; to design the great circle line when it is necessary ; to design the composite line when it is necessary; to print tracks of rhumb line and great circle line on Mercator chart.

我们用Visual C++设计的航线设计程序，可以计算出两点之间大圆航线和等角航线的相关参数；如果有必要进行大圆航行的话，程序将计算出大圆航线的航路点；如果需要混合航行的话，程序将进行混合航线设计。

In order to make the prior estimate of solution and calculate the upper right derivative of V along the solution, we employ some transformation techniques on fraction.

全文内容分为五章：第一章主要介绍了研究工作的意义、背景及本文主要工作和文中所要用到的一些引理。

In order to discuss disaster degree and hazard risk of perilous rock on road slope, a numerical analysis method was used to calculate full motion trace of the perilous rockfall along road slope.

为了研究公路边坡落石灾害的危害程度和危害风险，利用数值分析手法计算了危岩落石在沿坡面的完整运动路径。

Firstly,using the method of concentrate mass this paper establish a non-linear dynamics model of a two-stage gear train with backlashe between the gear pair,and through analysed the dynamics model,the torsional motion differential equations are got , on this basis,then calculate the torsional motion differential equations using Runge—Kutta method ,and discuss how to influence the dynamics characteristic of system when these parameters chage such as mesh frequentcies、 stiffness of the intermediate shaft、the ration of mesh frequentcies.and discuss when the chaos will happen under the change of these parameters.

首先用集中质量法建立系统的含间隙的非线性动力学模型，并根据牛顿力学定理，得到系统的运动微分方程。然后对所建立的运动微分方程运用四阶变步长Runge—Kutta方法进行了求解，并对计算结果进行分析，研究了齿轮啮合频率、中间联接轴的刚度，一、二级齿轮的啮合频率比等参数变化时，对系统非线性动力学特性的影响规律，并讨论了当参数如何变化时会导致系统的混沌响应的出现。

You pass up the George Foreman grill because you sagely calculate that the money would be better spent on, say, your child's college fund.

你放弃George Foreman牌炙烤炉是因为你很明智的计算出你的钱可以花在更好的地方，比如说，你孩子的大学基金。

You pass up the George Foreman grill because you sagely calculate that the money would be better spent on , say , your child 's college fund .

你不买乔治佛里曼的烤架是因为你明智地计算出这比钱将会得更好，比方说，你孩子读大学的基金。

You pass up the George Foreman grill because you sagely calculate that the money would be better spent on, say, your child's college fund. Or at least the mood clock.

你没有买那个乔治·弗曼烤肉架，是因为你谨慎的思考过这个钱可以用在更好的方面，比如说你的孩子的大学基金，或者至少你可以买个情绪闹钟。

In this paper, we calculate the energy band structure of the phononic crystal by making use of the method of plane wave expansion and investigate the influence of crystal structure, the properties of elastic units and the filling and shape of scatterer on the band gaps in an attempt to provide theoretical guidance to the preparation of phononic crystals.

本文利用平面波展开法计算声子晶体的能带结构，研究声子晶体的结构，组元的性质及散射体的填充率、形状对能带结构的影响，力图为制备性能良好的声子晶体提供理论指导。

In the computer simulation aspect, following work has been down:At first, the Wolfgang Schreiner's model is employed and extended to a new computer arteriole optimal growing model. Many new algorithms are described, such as signal tracing, resistance calculating, resistance balancing and flow balancing. With these algorithms and methods, the arteriole networks can be grown successfully on microcomputer.Secondly, a growing-network ordering method, which is called auto-centripetal ordering method of the growing networks, can be employed to order the growing networks to calculate the average parameters of the networks in level series.

在计算机模型及仿真方面：首先本文改进、推广了WolfgangSchreiner模型，提出小动脉计算机优化生长模型，以及信号灯追踪、计算网络阻力、阻力平衡和流量平衡新算法，利用这种模型和算法成功地在微机上生长出了小动脉网络；第二，本文提出生长网络自动向心分级法，对生长网络进行了自动分级，并将网络参数的分级统计结果与A。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。