空间运动

So far, the main aspects studied include: the forecast of sand transport rate, the spatial distribution of sand and wind field, the mechanism of start and maintenance of sand transport, the development process of sand ripple, the influence of physical character of the sand bed on sand motion and so on.

目前的研究成果主要涉及到风沙输运的输沙率的预测、沙粒和风场的空间分布规律、风沙运动的起动机制和维持机制、沙波纹的产生和发展机制以及地表物理性质的改变对风沙运动的影响等。

There are two closely connected aspects to biological sequences: their relative position in the space of all other sequences, and their movement through this sequence space in evolutionary time.

有两紧密把方面和生物学的顺序连结起来︰在进化的时间的透过这顺序空间的在全部其他顺序的空间内的他们的有关的位置和他们的运动。

Space robot motion planning is studied in two types of workspace.

空间机器人运动规划算法分两大类工作空间环境进行研究。

With the theoretical model of spherical grain dynamics of sparse two-phase flow in single dimension, computing formulas of velocity′s attenuation and scattering distance were built for explosive residue grains in horizontal. Then, a simplified theoretical model on distribution of explosive residue was put forward on the basis of a spherical space with radius equalling to maximum horizontal scattering distance of explosive residue grains with certain diameter.

为了对残留物颗粒的飞散运动及分布规律进行理论分析，利用球形颗粒一维稀疏二相流动力学模型，研究得到炸药残留物颗粒的速度衰减及水平飞散距离计算公式；在此基础上，建立了以某粒径残留物颗粒水平运动极限距离为半径的炸药残留物颗粒球面空间分布简化理论模型。

In the method, the orbit of targets and the radar coordinates and parameters are put to calculate attitude and dynamic parameters of targets in line of sight. And then the dynamic data are generated according to the electromagnetic modulation model of the movement of targets including motion at high speed, spin, precession on electromagnetic wave.

该方法首先确定目标的轨道和雷达的布站坐标及工作模式，而后计算目标在雷达观测视线(line of sight， LOS)方向上的姿态和运动参数，最后根据空间目标高速运动、自旋、进动等在电磁波上调制的数学模型生成动态测量数据。

The approximate solution to FPK equation isobtained. The joint probability density function and stationary mean out-crossing rateare investigated for ship nonlinear rolling subjected to additive white noise excitation.Melnikov function and phase space flux are applied to analyze highly nonlinear rolland capsizing of ships in the random seas. The variation of phase space flux withrespect to the characteristic wave period, significant wave height and damping ofships is studied.

求FPK方程近似解，研究白噪声激励下船舶非线性横摇运动的联合概率密度函数及稳定期望穿阈率，应用Melnikov函数和相空间转移率研究船舶在随机波浪中的强非线性横摇运动及其倾覆问题，考虑波浪特征周期、有义波高及船舶阻尼特性的变化规律，推导了船舶在随机横浪中的极限波高的表达式。

This paper describes a computer-controlled stroboscopic interferometer system for measuring out-of-plane motions of MEMS structures with nanometer resolution.

基于计算机控制的频闪干涉测试系统，文中提出了一种时间轴和空间轴双向解包裹的干涉条纹分析方法，实现了MEMS器件离面运动参数的精确测量，并与微结构平面结构图像模板相结合，可以进行MEMS器件全视场运动的分析，达到了纳米级分辨力。

In this paper, by means of mechanism analysis and design method, the splicing motion, including the yarn's take-in and guide mechanism during the splicing procedure, has been analyzed, in order to compute and design the spacial yarn guide mechanism and the cams profile for the splice r.

利用机构分析和设计方法分析纱线捻接的机构运动，对捻接过程中纱线的抓取和导引机构进行运动剖析，以便设计该导纱空间机构及有关的凸轮廓线，为空气捻接器机构的设计改进提供理论基础。

Based on the topological dimension reduction method presented by B. Zhang et al for the problem of motion planning in the environment consisting of precisely known polygonal or polyhedral obstacles, we further discuss the problem of motion planning for a multi—joint robotic arm.

对由完全精确已知的多边形或多面体组成的障碍环境中的运动规划问题，在张钹等提出的拓扑降维法的基础上，本论文进一步探讨了应用拓扑法的多关节机械手的运动规划问题，其中重点解决了状态空间中连通块的划分问题和连通块之间连通性的判别问题。

Based on teaching function for generation of workpeice process program, this paper suggests an interpolation algorithm of space line and arc and the transformation of space absolute coordinates to machine motion coordinates.

摘要在示教生成零件加工程序的基础上，讨论了空间直线和圆弧的插补算法以及空间绝对坐标到机床运动坐标的变换，并对插补算法的误差进行了分析。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。