逼近

Firstly, This paper processes geometry filtration based on character of orbit's apogee and perigee after orbit model is analyzed and based. Secondly Space Debris is separated into two kinds, coplanar and not coplanar according as location interrelation of target and debris. In Dynamic filtration's processing, considering prediction time limit and orbit perturbation, secular effects which have increaser effect is considered so that some need catching danger time point is appeased, some law about time when target and debris pass intersectant line each other is inferred, when debris and object are in different plane and some similar law also is inferred otherwise. The time list is arithmetical progression. These laws can improve calculation efficiency remarkably; Lastly orbit predict is a course approaching least distance. Danger time point in the last step become beginning time point from which debris and object's position and velocity are calculated by SXP4 Model which is an analytic model.By result, determine that relative movement trend is closer or apart, farther calculate the interval apart from time when predictive least relative distance occurs. Least relative distance and time when least distance occurs is calculated finally. It is a fast approach course adopting varied interval.

本文在分析、建立轨道摄动计算模型的基础上，首先采用基于轨道远、近地点特征对大量编目在册的空间碎片进行初步几何静态筛选，然后根据碎片与目标轨道面的相对位置特点把碎片分为异面与准共面两种情况以进行动态筛选，在筛选过程中考虑到预报时限长度和轨道摄动影响，引入了轨道摄动中具有积累效应的长期项以满足危险时间点的捕捉要求，利用了长期项摄动变化线性的特点导出了碎片与目标异面情况下各自过交线的时间序列成准等差数列的规律性和准共面情况下类似的规律性，从而显著地提高了前期轨道筛选的计算效率；最后对剩余危险碎片和目标飞行器利用SXP4轨道预报模型在前期轨道筛选的基础上以各个危险探测时间点为预报的时间起点，并根据预报计算结果，分析目标和碎片在该时间点的运动趋势是相互远离还是相互接近，推出预计最小相对距离发生时刻相对此刻的时间长度，得到其随时间变化的局部最小相对距离以及危险距离发生的时刻和相对速度，这是一个采用变时间步长、快速逼近最小相对距离的过程。

Considering on the monotonously increasing character of the displacement series in underground engineering, a new integrated intelligent method for displacement prediction is proposed.

针对地下工程变形监测中位移单调增长的特性，根据位移分解原理，采用灰色系统提取位移序列的趋势，用基于免疫进化规划的进化神经网络逼近偏差序列，提出了变形预测的集成智能建模方法，很好地解决了地下工程变形预测的难题。

But industrywide, total compensation is expected to rise 20 to 30 percent this year, approximately to the levels of 2005, before the crisis, according to Johnson Associates, a compensation consulting firm.

但提供薪酬顾问服务的约翰逊联公司表示，但今年这一行的报酬总额预计将成长百分之二十到三十，逼近和金融危机前的2005年相同的水平。

Ned Ordway lea ned forward, close to Inez , his face aggressive

内德·奥德威探身向前，气势汹汹地逼近伊内兹。

Vieille has shown that all two-person stochastic games with finite state and action spaces have approximate Nash equilibria when the total payoff is the limit inferior of the averages of the stage payoffs.

Vieille已经证明具有有限阶段和有限状态的两人随机博弈当中，如果博弈过程的报酬使用各个阶段报酬平均值的下限来计算的话，是具有逼近纳什均衡的。

In this paper, we will introduce the weighted modulus of smoothness and the weighted K-functional to discuss the direct and the converse theorems, the local saturation results on the simultaneous approximation on an infinite interval with Jacobi-weight by the integral operator, the lin...

本文利用带权光滑模与带权K--泛函讨论定义在无穷区间上的积分型算子Gamma算子线性组合对空间L_∞(0，∞)中函数的带Jacobi权同时逼近的正逆定理以及局部饱和结果，还讨论了Gamma算子的强逆不等式。

We prove that the GerberShiu functionΦsatisfies a renewal equation and a infinite series expression ofΦis obtained.

在本章中，利用逼近的方法，得到了此风险过程的罚金折现函数Φ满足的更新方程及其Φ的一个级数表达式。

This is normal, and the arbitrary function all can approach with dividing section multinomials because can know from infinitesimal calculus.

这是正常的，因为从微积分可以知道，任一函数都可以用分段多项式来逼近。

Nor God's infliction, nor death's neighbourhood

死神的逼近的威胁－－不管这一切

A rough approximation of the initial soil temperature is the average daily temperature for the region.

一个粗略的初始土壤温度逼近该地区的平均气温。

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。