查询词典 Brownian motion

Descartes and Gassendi were the first to insist that inertial motion must be rectilinear motion and that bodies move in circles or curves must be constrained by some external cause.

笛卡儿和加森迪首先坚持惯性运动是直线运动，在圆或曲线上的运动必被某些外因所限制）Such bodies， Descartes

For the timelike surfaces with constant positive Gaussian curvature (K=1) in R〓, we construct the correspondence between R〓 and sl (2, R), and deduce the fundamental equations for a special choice of the velocity of motion of time-like surfaces in asymptotic coordinates under suitable conditions, meanwhile, we give the B〓cklund transformation and one soliton solution of the evolution equations, then in terms of a gauge transformation we obtain the explict expression of the motion of surfaces.

对于三维Minkowski空间R〓中具有正常高斯曲率（K=1）的类时曲面，取定特定速度，在以渐近线作为坐标曲线的情况下，曲面运动满足两个基本方程，即sinh-Gordon方程和θ随时间演化的方程（其中θ表示两条渐近线之间的夹角），同时给出两个基本方程的B〓cklund变换和单孤子解，并通过规范变换给出相应的正常高斯曲率曲面的显式表达式。

While carrying out simulative program design for hobbing machining,the most difficult point is the description and modelling on the relationship between the cutter and gear blank both in space and in motion,especially the modelling of motion relation between cutter and gear blank in case there exists factors of error.

在进行滚齿的切削仿真程序设计中，其中最大的难点是对刀具和轮坯的空间关系和运动关系的描述和建模，尤其是存在误差因素时对刀具和轮坯之间运动关系的建模。

Moreover, for the treelike system with prescribed motion and the non-treelike system with closed-loop, the generalized coordinates aren't independent completely. Only the dynamical equations of the system and the constrain equations resulting from the prescribed motion and the closed-loop are combined to form DAEs, it can be solved.

另外，对于有指定运动的树系统或带有闭环的非树系统，系统的广义坐标是不完全独立的，系统的动力学方程要与指定运动或系统切断所附加的约束方程一起组成微分--代数方程组才能求解。

The two kinds of symmetries in holonomic and non-holonom-ic mechanical systems,i.e.symmetries of differential equations of motion(ab-breviated as SDEM)and symmetries of Noether-type,and interrela-tions among all kinds of symmetries are investigated.The necessary and suffi-cient conditions of SNT to be SDEM are found out.It is pointed out thatSDEM have distinct geometric properties which are equivalent to the geodesiccharacteristic of differential equations of motion and geodesic deviation.

文中研究了完整与非完整力学系统的两类对称性，即运动微分方程的对称性和Noether型对称性，以及各种对称性之间的相互关系，确定了Noether型对称性为运动微分方程对称性的充分必要条件，并指出运动微分方程的对称性具有明确的几何性质，即它等价于运动微分方程的测地性质以及测地偏离性质。

Physical analysis indicates that there is geostrophic balance in mesoscale atmospheric motion similar with synoptic atmospheric motion.

对中尺度大气运动的物理分析表明，中尺度大气运动中也存在与大尺度运动的地转平衡关系式完全相似地平衡关系。

In this paper, the criteria and results for selecting the level of no motion are determined by comparing and analyzing the calculated geostrophic flow results at PN section in the East China Sea Kuroshio mainstream area corresponding to different selections of level of no motion and taking the main characteristic factors of the East China Sea Kuroshio into consideration.

通过对东海黑潮主流段PN断面上选取不同零流面时地转流计算结果的比较分析，考虑了东海黑潮的主要特征因子，确定了计算零流面的选取标准和选择结果。

It is shown from the analysis results that in order to meet the requirement that the calculated geostrophic flow results can reflect the practical current profile structure, it is practicable to select the 700 m level as level of no motion in case of water depth greater than 700 m and to select the bottom boundary as level of no motion in calculating the geostrophic flow.

结果表明，为使计算结果可以反映实际的流速剖面结构，当水深大于700 m和小于700 m时可分别选取700 m层和底边界作为地转流动力计算零流面。

In the motion analysis, the thesis studies the motion mechanism and energy efficiency in gliding.

在运动过程分析中，论文研究了滑翔机的运动机理和航行效率。

Study the global motion estimation and compensation technology , presents a new video object segement algorithm under golbal motion, And actually segment the object from the moving background.

深入研究了全局运动估计与补偿技术，并提出一种全局运动下的视频对象分割算法，从运动背景中准确分割出视频对象。

Do you know of /about any way to get wine stains out of cloth?

你知道有什么方法可以把衣服上的洒渍去掉吗？

Inflorescences extra-axillary and sometimes terminal, lax cymose.

花序腋外生和有时顶生，疏松。