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In view of it, the algorithm based on the Fast Fourier Transform techniques with quadratic interpolation in the frequency domain is mainly presented. After that,the simulation is carried on and analyse the simulation curves deeply. It ndicates that this algorithm can not only enhance the frequency resolution, but only estimated frequency has high reliability and excellent stability. And it\'s feasible.

主要介绍一种基于FFT和在频域内二次插值的频偏估计算法，之后进行仿真、深入分析仿真曲线，结果表明该算法不仅可以提高频偏估计的精度，而且频偏估计值具有很高的可靠性和良好的稳定性，该算法是可行的。

The changes of daily load curves,that is the effect of the quantity of generated electricity and the difference values of peak to valley,are calculated by nonlinear optimal algorithm in this paper.

本文采用非线性优化方法，计算分析了 G 电力系统中 T 梯级水电站日负荷图形状的变化，即发电量大小和峰谷差值大小对梯级水电站运行的影响。

In order to realize the transition from quartic Wang-Ball to Said-Ball curve, and the transition from quartic Said-Ball to B6zier curve, two new classes of curves with shape parameters are defined.

为了实现从四次Wang-Ball到Said-Ball曲线的过渡，以及从四次Said-Ball到B6zier曲线的过渡，定义了2种带形状参数的曲线。

In this paper, a effective method of the shape control of rational quartic Bezier curves based on the weights modification was presented.

给出了一种基于权因子调整的四次Bézier 曲线形状控制的有效方法。

In chapter 3,we dig out two families of invariant quartic curves of a quadratic system.

第五章讨论向量场具有对称中心的二次系统，利用系统的不变双曲线及不变四次曲线，我们确定了一个对应极限环（1.1）分布的二维参数区域，其边界的构成为如下几种常见的极限环分枝：霍夫分析，庞加莱分枝，同宿分枝和异宿分枝。

The concept of quenching boiling was putforward, and the characteristics of curves of quenching boiling was studied.

提出了淬冷沸腾的概念，分析了淬冷沸腾曲线的特点及影响因素。

With queuing theory, the problem of the organization of the earthwork construction is solved in the Violet Gold Garden project with reverse construction method and the curves on efficiency and cost are given to make the machine disposition optimized economically.

结合天津市紫金花园工程"逆筑法"土方工程施工组织，运用排队理论解决土方挖运的施工组织问题，并得出在一定施工组织下土方开挖的效率和成本曲线，保证日出土量与机械配置在经济上达到最优。

Considering the predefined cutting precision,a point near the corner and two points on each edge of the original corner were determined,and then two pieces of quintic spline curves were constructed with the three points.

根据预定的裁剪精度，在拐角顶点附近及构成拐角的两邻边各确定一个位置点，由这3点构建两段五次样条曲线代替构成拐角的原直线段。

By mathematical method and computer simulation,it calculated the sun-light incidence rate of different surface radian curves of greenhouse.

通过数学方法，并结合计算机模拟，对日光温室不同弧度的采光屋面太阳光入射率进行了严密的计算。

It is simplified by approximating the radius of curvature, which provides the NURBS curves interpolators with good real-time performance.

该算法基于NURBS曲线的反算算法，通过合理的近似计算，对插补运算简化，保证了算法的实时性。

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。