查询词典 lunar

In this paper,an optimum trajectory from perilune to lunar surface is derived in terms of Pontryagin's maximum principle,which is an open-loop way.Then,an optimal nonlinear control law based on an fuzzy neural network is presented,on the basis of the optimum trajectory,due to the nonlinear mapping function of the fuzzy neural network,which is a closed-loop way.

本文根据终端着陆条件和性能指标，以由Pontryagin's极大值原理得出从近月点到月球表面的最优着陆轨迹为基础，给出一种基于模糊神经网络的非线性最优控制策略，使被控系统能够通过模糊神经网络的非线性映射能力实现某种最优的闭环制导控制。

Basically,an optimal nonlinear control law based on an artificial neural network is presented,on the basis of the optimum trajectory from perilune to lunar surface in terms of Pontryagin's maximum principle according to the terminal boundary conditions and performance index.

其主要内容是，根据终端着陆条件和性能指标，以由庞氏极大值原理得出从近月点到月面的最优着陆轨迹为基础，给出一种基于人工神经元网络的非线性最优控制策略，使被控系统能通过神经网络对非线性的映射能力实现某种最优的非线性控制。

Based on Pontryagin maximum principle, the lunar soft landing problem is transformed into a two-point boundary value problem in mathematics. In consideration of the bound condition and transversality condition, the resulted two-point boundary value problem is converted into a parameter optimization problem aiming at the initial values of conjugate variables and the terminal time, then it is solved by the nonlinear programming.

首先，从庞德里亚金极大值原理出发，将有限推力作用下月球软着陆问题转化为数学上的两点边值问题；在考虑边界条件及横截条件的前提下，将该两点边值问题转化为针对共轭变量初值和末时刻的优化问题；然后应用非线性规划方法求解所形成的参数优化问题。

This has now been reinforced by data from Lunar Prospector .

这已经加强了数据的月球勘探者。

This has now been reinforced by data from Lunar Prospector.

这已经加强了数据从月球勘探者。

In the summer of 1994, the Moon was very extensively mapped by the little spacecraft Clementine and again in 1999 by Lunar Prospector.

在1994年夏天，月球是非常广泛的映射的小航天器克莱门汀，并再次在1999年由月球勘探者。

Lunar Prospector mapped the Moon's surface composition, gravity and magnetic fields.

月亮探测器把月球的表面情况，引力及磁场都绘制成了地图。

The back after prothorax is aing string of 1 two red jujubes place hay to seam a string of beads of compose, there are a few fulcrums in little bag dumb " whip " small artillery piece, there is the money given to children as a lunar New Year gift of 5 wools cash that the grandfather will give me in the heart, do not carry have many perky much gladder.

前胸后背吊着两根红枣夹干草缝缀的串珠，小兜里揣着几支点哑了的"叭叭鞭"小炮，心里想着爷爷将要给我的5毛钱压岁钱，别提有多神气多兴奋了。

For three years, the Environmental Protection Bureau has promoted "gathering Pudu joss money and burning together" during the seventh lunar month when people across Taiwan burn large qualities of joss money creating thick smoke throughout the island.

在农历7月香烟袅袅的季节，环保局连续3年推动「中元普渡纸钱集中焚烧」，今年圆满达成200公吨纸钱集中焚烧的目标，成效为第1年的4倍，显示「环保祭祀」的观念已逐渐被社会大众所接受。

Fe/Mn molar ratios in pyroxene vary from 50 to 70 with an average of 63,in good agreement with the lunar pyroxene trend.

辉石的Fe/Mn摩尔比主要在50～70之间变化(平均值为63)，且其Fe-Mn摩尔数变化趋势也与典型的月球辉石一致。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。