This kind of periodic orbit is only a phase in a comet's life.
这种周期性轨道只是彗星生命中的一个阶段。
But the periodic orbit of the system must be found, before OGY method can work.
利用OGY方法必须预先知道系统要被稳定的周期轨道，并且这种方法控制的实时性较差。
The close return pairs technique is utilized to estimate an approximate desired periodic orbit.
利用闭回路对技术估计欲稳定周期轨的近似位置。
Then it is proved that the difference periodic orbit preserves the convexity of periodic orbit.
然后证明了差分周期解的凸性不变性。
The stabilization of an unstable periodic orbit in a neighborhood of an unstable fixed point is studied.
讨论了不稳定不动点邻域的不稳定轨道的稳定问题。
This paper mainly USES the descent of the maps to give a periodic orbit of class continuous map of the square.
本文主要利用映射的下降给出一类二维自映射的周期轨道。
To characterize the deterministic dynamics in heart rhythm, the unstable periodic orbit analysis were the RR interval time series of healthy young men.
为刻划心脏节律存在的确定性动力学特征，运用不稳定周期轨道分析方法对健康青年人的RR间期时间序列数据进行分析。
The small control is adopted also in the phase control and the best phase matching between the control signal and the unstable periodic orbit is reached. Then the best effect of control is got.
外激励相位控制采用微小信号控制并使控制信号与系统的不稳定周期轨道达到最佳相位匹配，获得最佳控制效果。
Using the periodic orbit theory, we computed the quantum level density of a particle in the two-dimensional harmonic oscillator potential with and without the magnetic flux line for different cases.
利用周期轨道理论，我们计算了在不同情况下，一个粒子在二维谐振子势中存在和不存在磁通量时的量子能级密度。
Periodic changes in Earth's orbit could affect Earth's climate.
地球轨道的周期性变化会影响地球的气候。
Let's continue our discussion now by talking about orbits, especially those of the so-called periodic-orbit comets.
现在我们继续讨论，谈谈轨道，特别是那些所谓的周期轨道彗星。
By using the classical orbit element differences method, the periodic characteristics of relative motion and the influence of atmospheric drag on relative motion were analyzed.
基于经典轨道要素偏差法分析了相对运动特性和大气阻力对相对运动的影响。
By the orbit in the phase portraits, different kinds of solitary wave, kink wave and periodic wave solutions are obtained.
通过相图中的各种轨道，获得了孤立波，扭子波和周期波的精确解。
Since the geomagnetic field varies periodically on orbit, the dynamics of satellite is a linear periodic system.
由于地磁场的方向在轨道上周期变化，卫星的姿态动力学方程是一个线性周期系统。
And the regressive orbit satellitr's trait is that the satellite can cover the earth periodic, it benefits the dynamic reconnaissance.
而回归轨道的特点是周期性地覆盖地球，这有利于对地球上动态目标的侦察。
The periodic relative orbit was designed based on the relative orbit elements and the mission requirements.
采用相对轨道要素设计了理想的基准伴随轨道。
Numerical solutions are periodically summed and averaged to get rid of short-periodic-term effects. By analyzing polished data, its orbit characteristics are revealed to us.
对所得仿真数据利用求和取平均的方法去除摄动力产生的短周期效应，通过分析去短周期项后的数据揭示出逆行地球同步轨道的演变特点。
Numerical solutions are periodically summed and averaged to get rid of short-periodic-term effects. By analyzing polished data, its orbit characteristics are revealed to us.
对所得仿真数据利用求和取平均的方法去除摄动力产生的短周期效应，通过分析去短周期项后的数据揭示出逆行地球同步轨道的演变特点。
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