查询词典 mirror plane

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。

Results: The satisfactory MPR images of cochlea, bony semicircular canals, internal auditory meatus and other intratemporal structures can be obtained. The SSD images could show some important bony marks of temporal bone and spatial relationships between them clearly. On coronal plane, SSD images can vividly demonstrate the shape and spatial relationships of malleus and incus. A series images were obtained as the virtual endoscope moved from the external auditory canal to the middle ear cavity.

结果：MPR能在不同切面显示耳蜗、半规管、内耳道及面神经管垂直段等结构，显示率为100%；SSD能清晰显示颞骨重要的骨性结构，如内耳门、颈静脉孔等，冠状位切割后的SSD图像能生动地显示锤骨、砧骨的立体形态及空间关系；CTVE可模仿内窥镜从外耳向中耳移动，清晰显示骨性外耳道、鼓室内侧壁及听骨链等结构。

Numerical calculation of plane ground influence on induced current on cable by EMP.

大地对电磁脉冲感应的电缆电流影响的数值计算。

An inductive component was observed in low frequency range during pit incubation period, and the impedance plane composed of two capacitive loops during pit propagation period.

稳定钝化时，是具有一个时间常数的单容抗曲线；在孔蚀诱导期，低频区阻抗实部呈现电感性收缩现象；在孔蚀发展期，是具有两个时间常数的曲线。

Firstly a proper unstable linear system satisfied shilnikoc inequation is selected. Then shift transformations of the linear system are implemented and the phase space is divided into several parts by a series of cross-plane. Finally the needed multi-scroll piecewise linear chaotic system is constructed.

首先选取满足Shilnikov不等式的不稳定线性系统，然后对该系统进行平移变换，并以相交平面为分界而对相平而进行划分，最后得到所需的多涡卷分段线性混沌系统。

The method utilizes the friction force between the object to be moved and the fixed base plane, and the reaction of the inertial force caused by a dynamic rapid deformation of a piezoelectric element.

这种方法是利用移动体与固定的基平面之间的摩擦力以及由压电元件动态的急速变形所产生的惯性力的反作用力来产生精确运动的。

At the same time, between the ministries and commissions needs to unify coordinated, otherwise involves the stratification plane is too broad, a department is inextricability the problem.

同时，部委之间需要统一协调，否则涉及的层面太广，一个部门是无法解决问题的。

Lucia: I heard about your operation, Aunt Inez, and I'm jumping on a plane right now to come and help you out.

听说了你做了手术， Inez 姑妈，我马上飞过去帮你一把。

By symmetry method, we successful solved (1) the problem of the half infinite plane received the concentrated strength in vertical direction ;(2) the problem of the wedge received the strength in its top.

用对称方法成功求解了(1)半无限平面受有法向集中力作用问题；(2)楔形体在楔顶受力问题。

Therefore, the stress and strain of a half infinite plane indented by a sliding spheric tip were calculated based on an elastic-linear strengthened plastic deformation model, making use of a commercial software.

选用20#钢、45#钢、T8钢3种材料作为研究对象，利用三维有限元法动态模拟刚性球形磨粒在弹-线塑性平板上的压入-划动过程，所用磨粒半径为0.15mm，试样尺寸为1.2mm×1.2mm×3.0mm，划动距离1.2mm；采用ANSYS/LS-DYNA软件对每种材料在压入深度0.01～0.10mm范围内进行10次动态模拟。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？