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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。

Many a village Bose, fit only to course a mud-turtle in a victualling cellar, sported his heavy quarters in the woods, without the knowledge of his master, and ineffectually smelled at old fox burrows and woodchucks' holes; led perchance by some slight cur which nimbly threaded the wood, and might still inspire a natural terror in its denizens;—— now far behind his guide, barking like a canine bull toward some small squirrel which had treed itself for scrutiny, then, cantering off, bending the bushes with his weight,imagining that he is on the track of some stray member of the jerbilla family.

许多村中的牛，行动迟缓，只配在储藏食物的地窖里追逐乌龟的，却以它那种笨重的躯体来到森林中跑跑跳跳了，它的主人是不知道的，它嗅嗅老狐狸的窟穴和土拨鼠的洞，毫无结果；也许是些瘦小的恶狗给带路进来的，它们在森林中灵活地穿来穿去，林中鸟兽对这种恶狗自然有一种恐惧；现在老牛远落在它那导游者的后面了，向树上一些小松鼠狂叫，那些松鼠就是躲在上面仔细观察它的，然后它缓缓跑开，那笨重的躯体把树枝都压弯了，它自以为在追踪一些迷了路的老鼠。

Chapter 4 studies some composition operators between Nevanlinna type classes. Some criteria for C〓 to improve some integrability are given.

第四章研究了不同Nevanlinna型空间之间的复合算子，给出了C〓改善函数某种可积性的一些判据。

Lots of things can influence me. Some might be integrated into my works immediately and some into deep consciousness and will surface unexpectedly some time in the future.

很多的东西会影响到我，有些东西可能会马上进入我的创作，有些可能进入深层意识，在将来某个预期不到的机会浮现。

The main contents include: Some preliminary theory (introduction to Sobolev spaces and variational formulations for differential equations); finite element methods for one-dimensional elliptic problems; the construction methods for general finite elements; error estimates for interpolation operators and inverse inequalities for finite element spaces; a priori and a posteriori error estimates for the finite element method for high-dimensional elliptic problems; some typical spectral methods for partial differential equations; error analysis for the spectral approximation for some linear and nonlinear partial differential equations.

主要内容有：准备知识（Sobolev空间的基本概念和主要结果，微分方程的变分描述）；一维椭圆型方程有限元方法；一般有限元的构造；插值算子误差估计和逆不等式；高维椭圆型方程的先验、后验误差估计；求解偏微分方程的几类谱方法；线性与非线性问题谱逼近的误差分析等。

As an extension, we also obtain some sufficient and necessary conditions under which M_c is left Fredholm and left Weyl for some left invertible operator C, respectively.In chapter 2, the sufficient and necessary condition under which the difference of two idempotent operators on infinite dimensional Hilbert spaces is Fredholm (in-vertible) is discussed. In addition, some equivalent conditions under which products and differences of projections in a C~*-algebra are Moore-Penrose invert-ible are obtained.

来源：Ae5BCab论7a文网www.abclunwen.com对给定的算子对，给出存在左可逆算子C使得M_C左可逆的充要条件；存在可逆算子C使得M_C左可逆的充要条件；存在左可逆算子C使得M_C是左Fredholm算子的充要条件；存在可逆算子C使得M_C是左Fredholm算子的充要条件；存在左可逆算子C使得M_C是左Weyl算子的充要条件；存在可逆算子C使得M_C是左Weyl算子的充要条件。

During some large mechanical preventive maintenance, sometimes it need to unload some round articles, the widespread way of doing this is to use mechanical spring exerciser now. And in some places use the strong line of ironware to pry, but it not only does seriously destroy to the workpiece, but also may be harmful to the workman.

在许多大型机械的维修行业中，有时要进行一些轮类物件的拆卸，目前普遍的做法是用机械式的拉力器，有的地方用铁器强行撬，对物件产生很大程度的破坏，而且对工作人员存在安全隐患。

You have a bucket of jelly beans. some are red, some are blue, and some green.

你有一袋糖，有红色的，蓝色的，绿色的。

You know, like syrup or some honey or some jelly or some...

你知道 比如糖浆或者是果冻什么的。。。

Some think it will be because of some nuclear war , some say it will be because it's biblical judgment day .

一些人认为那是因为一些核战争，有人说这将是因为它是圣经的审判日。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。