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First, the locally optimal control law s are derived for each modified equinoctial orbital element.

研究了近地小推力转移轨道的制导问题,给出了一种基于局部最优控制律的自主制导算法。

Some have such a vast appetite for the former commodity, that is, the news, and such sound digestive organs, that they can sit forever in public avenues without stirring, and let it simmer and whisper through them like the Etesian winds, or as if inhaling ether, it only producing numbness and insensibility to pain —— otherwise it would often be painful to bear —— without affecting the consciousness.

有些人,对于前一种的商品,即新闻,是胃口大,消化能力也一样大的,他们能永远一动不动地坐在街道上,听那些新闻像地中海季风般沸腾着,私语着吹过他们,或者可以说,他们像吸入了一些只是产生局部麻醉作用的乙醚,因此意识还是清醒的,苦痛却被麻痹了,——要不然有一些新闻,听到了是要使人苦痛的。

The physical meanings of BEM are extended by the FBEM and FPFM. On the basis of solving plane problems sueessfully with FBEM and FPFM, the article recommends the fictitious boundary element method and fictitious point force method to solve three dimensions problem in solid mechanics.

本文对边界单元法进行了改进,提出了使用方便、灵活、物理意义清晰的虚边界单元法和点载荷法,较好地解决了局部数值解精度不高的问题,并将所提出的方法推广应用到求解三维问题,减少了问题的复杂性。

Hence, reproducing kernel function has not only the advantage of calculation, e.g.it can transform the integration into the sum of finite function values, but also theadvantage of local characteristic of wavelet function.

所以再生核函数既具有计算优势,如能将积分计算准确地转换成有限个函数值的和来计算,又具有小波函数的局部刻画优势。

Geographical disaster resulted in soil movement and ground deformation, so buried pipeline will occur bend,compress,distort,rip,and part flection and other breakage activities.

地质灾害引发土壤运动和地表变形,从而导致埋地管道产生弯曲、压缩、扭曲、拉裂、局部屈曲等破坏行为。

Yangna's works are good at griping people's visual attention by bright and grandiloquent partial portrayal, and then reasonably add the narrative description, quietly implying people's psychological state by properties, poses, gestures, etc.

杨纳的作品善于以鲜亮、夸张的局部刻画抓住人的视觉注意,然后再适度地增加叙事性的描述,通过道具、姿态、手势等悄然暗示人的心理状态。

The main procedures are as following: to generate small increment of parameters automatically and to calculate the FE several times and obtain the sensitivity of objective function to the parameters, and then form a Hermite polynomial approximation, the calculation of FE solutions are substitute by the calculation of polynomial approximation, so time cost decreases dramatically.

用n维埃尔米特插值技术建立设计变量在可行域上的目标函数的逼近函数;将局部寻优的梯度算法和全局寻优的随机算法结合起来,大幅度地降低寻优过程中电磁场的计算次数。

The project proposed and established the strict unique mathematical model of instantaneous frequency aiming at the currently existed problems in Hilbert Huang Transform form the viewpoint of physical connotative meaning; proposed and established the strict mathematical model of general intrinsic mode signal based on the concept of general continuous intrinsic mode signal and the compositive principle of practical general intrinsic mode signal; researched and proposed the fitting method of envelope lines in HHT from the viewpoint of theory, conquered the blindness and random in quondam EMD envelope line fitting and boundary treatment; developed a virtual time-frequency analyzer based on general intrinsic mode signal decomposition to open out the local time-frequency characteristics of nonlinear and nonstationary signal more deeply and accurately.

本项目针对希尔伯特-黄变换现阶段存在问题,从物理内涵的角度提出并建立了瞬时频率严格的唯一的数学模型;基于连续性的一般固有模态信号的概念和实际信号的一般固有模态信号的组成原理,提出并建立了一般固有模态信号严格的数学模型;从理论角度研究并提出HHT中的包络线构造方法,克服了原EMD的包络线构造和边界处理的盲目性和随意性;研发一台基于一般固有模态信号分解的虚拟式时频分析仪,使之可以更深入、准确地揭示非线性非平稳信号的时频局部特征。

Instantaneous frequency is function of time that gives sharp identification of imbedded structures in signal.

由于瞬时频率是时间的函数,因此可以获得信号任意时刻的频率分布,利用瞬时频率的局部化特征可以有效地揭示信号的内在结构。

Firstly, This paper processes geometry filtration based on character of orbit's apogee and perigee after orbit model is analyzed and based. Secondly Space Debris is separated into two kinds, coplanar and not coplanar according as location interrelation of target and debris. In Dynamic filtration's processing, considering prediction time limit and orbit perturbation, secular effects which have increaser effect is considered so that some need catching danger time point is appeased, some law about time when target and debris pass intersectant line each other is inferred, when debris and object are in different plane and some similar law also is inferred otherwise. The time list is arithmetical progression. These laws can improve calculation efficiency remarkably; Lastly orbit predict is a course approaching least distance. Danger time point in the last step become beginning time point from which debris and object's position and velocity are calculated by SXP4 Model which is an analytic model.By result, determine that relative movement trend is closer or apart, farther calculate the interval apart from time when predictive least relative distance occurs. Least relative distance and time when least distance occurs is calculated finally. It is a fast approach course adopting varied interval.

本文在分析、建立轨道摄动计算模型的基础上,首先采用基于轨道远、近地点特征对大量编目在册的空间碎片进行初步几何静态筛选,然后根据碎片与目标轨道面的相对位置特点把碎片分为异面与准共面两种情况以进行动态筛选,在筛选过程中考虑到预报时限长度和轨道摄动影响,引入了轨道摄动中具有积累效应的长期项以满足危险时间点的捕捉要求,利用了长期项摄动变化线性的特点导出了碎片与目标异面情况下各自过交线的时间序列成准等差数列的规律性和准共面情况下类似的规律性,从而显著地提高了前期轨道筛选的计算效率;最后对剩余危险碎片和目标飞行器利用SXP4轨道预报模型在前期轨道筛选的基础上以各个危险探测时间点为预报的时间起点,并根据预报计算结果,分析目标和碎片在该时间点的运动趋势是相互远离还是相互接近,推出预计最小相对距离发生时刻相对此刻的时间长度,得到其随时间变化的局部最小相对距离以及危险距离发生的时刻和相对速度,这是一个采用变时间步长、快速逼近最小相对距离的过程。

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推荐网络例句

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性,但我大喊,并在他们的方向扔石头让他们过的线索,远离我,以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。

Store this product in a sealed, lightproof, dry and cool place.

密封,遮光,置阴凉干燥处。