轨道的

Chapter 3 analyzes numerically the effects for orbit calculation caused by orbital perturbation, parameter error and so on. A precise mathematical model of orbit calculation is given.

第三章通过数值法分析了各项轨道摄动和参数误差等因素的对轨道计算的影响，给出了精确的月球探测器轨道计算数学模型。

Furthermore,the mathematical relationship between SS-O nodal period and orbital semimajor axis was deduce,which has been available for SS-O design.

推导出的太阳同步轨道交点周期与轨道半长轴的关系式已成功应用于某课题的太阳同步轨道设计中。

For third rail systems, the shore supply cables are usually fed from electrified rails suspended from the shed roof. The cables are hung from trolleys running along the rails so that the supply is available along the whole track.

对于三轨供电系统，供电电缆通常是由安装在屋顶的带电轨道上悬吊下来的，从轨道上悬吊下来的电缆可以沿轨道移动，为车辆各处提供用电。

The line that passes through the center of the Earth linking the perigee and apogee, known as the line of apsides, itself rotates in the orbital plane at a speed that depends on the geometry of the elliptical orbit and the inclination of the orbital plane to the equator.

经过地球中心，连接近地点和远地点的线称为apside线，卫星在轨道平面上以某个速度旋转，这个旋转速度根据椭圆轨道以及轨道平面到赤道的倾角的几何学来计算。

Setting up city track transportation system is the way to solve the traffic in the cities, and to realize substanable development. There have tow reasons: first, city track transportation has many merits, great capability, quick speed, safety on time, low cost, saving energy, catabatic traffic block on the ground, protecting the environment and so on; second, though track transportation, the develop derection of city constructure turns from single-center homocentric cirlarity mode to multi-center axes mode.

修建城市轨道交通是解决当前大城市交通问题、实现可持续发展的有效手段，其表现有二：第一，城市轨道交通具有运能大、速度快、安全准时、成本低、节约能源、能缓解地面交通拥挤和有利于环境保护等优点；第二，城市轨道交通的修建使城市结构的发展方向从单中心同心圆结构转向多中心轴线式结构。

The preliminary intend of the LORIC to make the development of urban rail traffic,especially the nationalization of metro ,as the economic increase point in the 21 st century is expressed.

介绍了中车公司生产轨道机车车辆的历史、能力和对当前我国城市轨道交通发展的展望，以及中车公司把发展城市轨道车辆，特别是地铁国产化作为21世纪经济增长点的初步打算。

Therefore, since the early 1960s, countries around the world have been carried out to the overall rail-bed, or curing alternative granular ballast of the various Ballastless track structure of the system, some countries have Ballastless track as the main high-speed railway Track structure of a comprehensive application.

因此，自上世纪六十年代初，世界各国铁路相继开展以整体式或固化道床替代散粒体道碴的各类无碴轨道结构的系统研究，一些国家已把无碴轨道作为高速铁路的主要轨道结构型式全面推广应用。

Setting slide layer is a good measure to reduce the interaction between the rail and bridge, and rail expansion joint on long span bridge can be cancelled.

桥上纵连板式轨道借助底座板的纵连解决梁端转角对轨道结构的不利影响，通过设置滑动层来削减梁轨相互作用，在大跨桥上可以取消钢轨伸缩调节器，这种设计思想对大跨桥上铺设无砟轨道具有积极的借鉴意义。

Both of these two methods have to introduced self-consistent field calculation, smoothened Slater type orbitals and Gauss type orbitals instead of precious hydrogen like atomic orbitals are commonly used as the basis sets.

这两种方法都采用自洽场的计算方法，计算过程中都采用光滑化的Slater型轨道或Gauss型轨道代替精确的类氢原子轨道作为基函数。

Then after closure, taking steel perimeter beam and perimeter beam rail as slip base, in order of symmetrical balance, hoisting each steel "leaf" respectively up to the installation platforming of steel leaf, again by utilizing the steel perimeter beam, perimeter beam rail and hydraulic thrusting slip equipment, performing the installation for the eight steel leaves until they are closed together.

施工中采用了&一点吊装、平面滑移&的技术进行安装，即采取同一固定点吊装，先将分段钢环梁利用环梁轨道和液压顶推设备滑移，分段逐步滑移和顶推、逐步拼接，直至钢环梁合拢。将合拢后的钢环梁和环梁轨道作为滑移底座，按对称、平衡的顺序将每片钢叶瓣分别吊装至安装平台上，再次利用钢环梁、环梁轨道和液压顶推滑移设备，将8片钢叶瓣逐步安装到位。

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％。