轨道的

The analytical method is always used due to the large amount of the objects and not very high accuracy of forecasting. A method based on the position and velocity derived from the mean orbit elements directly is given, which is to avoid the problem of singularity in calculating the periodic terms of orbit elements variation, thus the process and software can be simplified.

在已有分析法得到t时刻平均根数的基础上给出一种轨道预报方法，由t时刻的平均根数给出该时刻卫星的位置和速度，在此基础上将地球非球形引力摄动的周期项直接用卫星直角坐标的位置和速度分量表示，这样可以避免在计算轨道根数变化的周期项时出现的奇点问题，从而对根数的选择无特殊要求，可适用于各种轨道，简化预报程序和相应的软件，提高预报效率。

The orbits of the point stabilizer of a finite permutation group are called the suborbits of the permutation group. The determination of the suborbits of a permutation group is one of the basic problems in the permutation group theory. It plays an important role in the study of combinatorial structures.

一个有限传递置换群的点稳定子群的轨道称为该群的次轨道，决定一个置换群的次轨道结构是置换群理论的基本问题之一，它在组合结构的研究中有着重要的应用。

The core issue of developing urban mass transit is the capitalfunding. However, the construction of an urban mass transit line will pushforward the value adding to real estate along the line.

发展城市轨道交通的核心问题是筹集资金，而轨道交通的建设会促进沿线房地产的增值，如何将轨道交通的这种外部效益转化为内部效益是需要进行研究的课题。

The principles and steps of the methods were introduced, the sixth grade track ire-gularity PSD of U.S. railway samples in time domain were achieved by simulating trigonometric series respectively, the samples were taken as the inputting disturbances of a vehicle-track vertical dynamics model, the time response courses of vehicle system we- re obtained by numerical simulation.

介绍了国内外常用的轨道不平顺数值模拟方法的模拟原理和步骤，采用计算机仿真程序模拟出三角级数法生成的美国六级轨道不平顺谱时域样本，并以此作为车辆一轨道垂向动力学模型的输入激励，通过数值仿真得出系统的时间响应历程。

Within a click the AlphaWipe Tracks Cleaner securely erases your internet tracks, application tracks, computer activities and programs history information stored in many files and unevident places on your computer.

在一个点击alphawipe轨道清洁安全的清除您的Internet轨道，轨道上的应用，计算机的活动和节目的历史资料储存在许多文件和unevident地方，在您的计算机上。

Test results are as follows: Ballastless track structures can effectively improve the dynamic action of train loads on subgrade beds, the measured stresses and acceleration rates are far smaller than those measured with ballasted track structures; axle loads have remarkable influence on dynamic stresses of ballastless track subgrades and have some influence on acceleration responses; speeds of either motor car units or freight trains all have limited effect on dynamic embankment responses; after attenuating over 3 meters high embankment, neither dynamic stresses nor acceleration rates are influential to net cushions at the bottom of column-net structure subgrades

结果表明：采用无砟轨道结构可以有效改善列车荷载对路基基床的动力作用，测得的动应力与加速度值均远小于有砟轨道结构测得的值；列车轴重对无砟轨道路基的动应力影响明显，对加速度响应也有一定影响；无论是动车组还是货物列车，其运行速度对路堤部分的动响应影响均有限；动应力与加速度经3 m 高的路堤后衰减，对桩网结构路基下部的网垫层已基本无影响。

In the direct-location, with the precise model of satellite motion and its osculating parameters, a more accurate formula for the orbit calculation of satellite is obtained. Meanwhile, the determination of the position information of each pixel is more accurate with the precise model of earth shape.

二、直接定位中，通过建立精确的卫星运动轨道模型、卫星摄动模型，优选确定了卫星轨道计算公式，以提高卫星轨道计算精度；同时，采用对称椭球体的地球形态模型和融入卫星姿态的地面扫描点位置的计算方法，可使确定的地面扫描点的地理位置更精确。

The paper describes how the local force of the main web is considered as the force caused by the Contact pressure among the trolley wheel, rail and top flange, and how the contact analysis model for the local force is built by means of both Hertz theory and finite element software ANSYS combined. Also, it analyzes the variation of the local stress under the different conditions and comes to a conclusion, and compares the results derived from the experimental formula with the result from ANSYS.

本论文的主要内容：将Hertz接触理论和有限元软件ANSYS结合起来，把主腹板的局部受力问题视为小车轮与轨道及轨道与上翼缘板之间发生接触行为作用下的受力问题，建立了小车轮压作用处偏轨箱形梁主腹板局部受力的接触分析模型，研究不同情况（小车轮压、箱形梁几何参数和轨道截面惯性矩）下局部应力的变化规律，得出相关结论；最后将经验公式解与ANSYS数值解进行对比分析论证。

With optimal and rolling cover publish style, content of every issue, and the reflection of products user groups and readers ′ enterprises to market, we choose sixteen thousand most suitable readers and take the high level decision makers, managers and engineers of municipal plan department and transport operation department and rail transit corporations as the main publish targets.

同时，《轨道交通》坚持鸿与智工业媒体&弃繁从简、直达客户&传播理念，以精准优化、滚动覆盖的发行方式，根据每期的编辑内容，客户产品的用户群以及读者企业对市场的反应能力，精心优化最合适的16000 名读者，并将市政规划及交通运营部门及轨道企业高层的决策人员、生产管理人员、工程师等作为主要发行对象，对于重点行业的读者每期滚动覆盖，从而全面覆盖中国轨道交通业。

By using high-resolution reference data to identify accurate GCPs, considering the spacecraft attitude deviations which TBUS can't supply, and adjusting the epoch time and ephemeris data at the criteria of constraint LeastMean-Square-Error, the geolocation accuracy of navigation for AVHRR data can be improved greatly.

由于采用具有足够定位精度的高分辨率参考图象以提取高精度的地面控制点，考虑了TBUS轨道报所不能提供的卫星姿态偏差，对历元时刻和卫星轨道根数进行有约束条件的参数最优调整，可使整条轨道大范围内的AVHRR导航定位精度有较大提高。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。