近圆

导航卫星一般采用近圆轨道，当卫星轨道偏心率或者轨道倾角接近于零时，利用GPS卫星开普勒轨道根数拟合卫星广播星历会出现一些问题。

When their orbit eccentricity or inclination are near zero , some problems may occur when the GPS Kepler orbit elements fitting method is applied to fit their broadcast ephemeris parameters .

在地心引力场中，当目标航天器沿近圆轨道作无动力运动时，与目标航天器相邻的受控航天器相对于目标航天器的运动可以近似地用Hill方程描述。

When a objective spacecraft ( OS ) moves along near circular orbit in unpowered flight , the relative motion of controlled spacecraft ( CS ) relatively to the OS is described approximately by the Hill equations on condition that the CS is near to the OS .

基于C-W方程的相对动力学模型，用Lyapunov直接法设计了一种运行于近圆轨道航天器的近程导引控制律，给出了控制模型。

The control law for short distance guidance and space rendezvous of two spacecrafts flying in nearly circular orbit was put forward based on the relative motion of C-W equations in this paper , which adopted Lyapunov approach . The control model was given .

研究了近圆轨道上两个飞行器轨道交会的控制问题。

The problem of control for two spacecrafts rendezvous is investigated .

性孢子器近圆瓶状，几乎全部突出寄主组织。

Pycnia were flask shaped , entirely on host tissue .

多冲量近圆轨道交会的部分变量瞄准法

Partial Variable Aiming Method for Multi-Impulse Quasi-Circular Orbit Rendezvous

近圆轨道编队飞行星座相对构型稳定性分析

Stability Analysis for Relative Configuration of Spacecraft Formation Flying

磁场约束的近圆弧形等离子体拱

Nearly Half Circular Plasma Arch Confined by Magnetic Field

一类由星下点反算卫星近圆回归轨道的方法

Calculation Method of a Kind of Near-round Repeating Satellite Orbit Using Nadir Points

近圆轨道控制的分析方法

An Analytical Method for Controlling Near Circular Orbits

近圆轨道卫星编队捕获技术研究

Satellite Formation Establishing in Near Circular Orbit

邻近近圆轨道上两个飞行器的相对运动可以用线性化C&W方程描述。

The relative motion of two spacecrafts between two near circular orbits is described the linearized C-W equations .

雄蕊四枚，花药近圆球形，开花后伸长于花冠之外。

There are four androeciums in a flower , the anther is near sphericity and androeciums protrude after florescence .

研究了航天器在近圆轨道面内横向固定间隔距离内伴飞编队维持问题。

A maintenance control strategy for formation spacecraft flying in a near-circular orbit with fixed along-track distance tolerance was presented .

基向量法是求解近圆轨道间固定时间最优交会的一种几何方法。

Primer vector method is a geometric method for obtaining optimal solutions of the rendezvous between elliptical orbits of low eccentricity .

成熟籽粒中淀粉粒形状有饼形、椭圆形和近圆球形三种。

There were three kinds of starch granules in endosperm cells , which was cake , ellipsoid , ball shape , respectively .

首先基于二体假设，采用两种方法系统地研究了圆或近圆轨道上卫星编队飞行的构成机理。

Based on the two-body assumption , two methods are used to investigate the mechanism of satellite formation flying on circular or near-circular orbits .

针对圆（近圆）轨道航天器相对运动的固定时间状态转移问题，提出了一种基于导航点的多脉冲优化轨迹生成策略。

An optimal trajectory generation strategy based on way-points is presented to solve the fixed-time state transition for spacecraft relative motion in a circular orbit .

提出了一类近圆回归轨道的设计方法，解决当飞行任务对星下点有要求时，近圆回归轨道的设计问题。

A method of nearly-round repeating orbit designing is proposed . It 's aimed to resolve the question of orbit designing with the restriction of a specific satellite ground trace .

滑面为近圆弧形，位于排土场的中部，后缘拉裂，中部沿粘土层滑动，前缘在排土场坡脚上方一定位置剪出。

Sliding surface for nearly arc in the central of dumping site , fracturing at the back of the margin and the central sliding along the clay layer shear out in front foot of dumping site in the above .

近轴圆对称光束的角动量及其应用

Angular Momentums of Paraxial and Cylindrical Symmetric Beams and Their Applications

GB/T14075-1993光纤色散测试仪技术条件近红外圆二向色性测量仪

Specifications for optical fiber chromatic dispersion measuring set near-infrared circular dichroism instrument

近红外圆二向色性测量仪

Near-infrared circular dichroism instrument

程序采用一次输入、系统运算、中间显示与自动打印的方案，大幅度的简化了近中区圆域地改的计算工作。

By using the schemes of single input , systematic calculation , intermediate display and automatic printing out , this program has , in great extent , simplified the work of calculation of the ground correct value of the near central area .

高粱叶片PEP羧化酶的溶液构象&近紫外圆二色性光谱研究

Near Uitraviolet circular dichroism studies on the conformation of sorghum leaf phosphoenolpyruvate carboxylase in solution

蛋白内源荧光光谱表明，Co~（2+），Hg~（2+）和Ag~+的结合会影响蛋白三级和四级结构，这一点可以从近紫外圆二色谱和Soret圆二色谱数据得到证实。

The intrinsic fluorescence spectra , shows that Co2 + , Hg2 + and Ag + affect tertiary and quaternary structure of Hb which is supported by the CD data in near-UV spectra and Soret CD spectra .

近室温下圆翅热管翅片结构的遗传算法优化

Optimization of uniform annular fin heat pipe based on genetic algorithm under condition of room-temperature