Despite the innocuous sounding name, the launch of planet Earth's first artificial moon, Sputnik 1, by the Soviet Union on October 4, 1957, changed the world and set in motion events which resulted in the creation of NASA and the race to the Moon.
虽然这名字无伤大雅，但是作为地球的第一颗人造卫星，苏联在1957年10月4日发射的斯普特尼克一号震撼了整个世界，引起了一系列事件，包括NASA的促生，以及最终目标为登陆月球的太空竞赛。
A motion constraint equation for moving target is derived by the first order geometric features.
利用一阶几何特征导出了目标的运动约束方程。
As for contact and collision problems, constraint conditions on velocity imposed by collisions are established first, and then they are incorporated into the Hamilton's Principle after introducing a Lagrangian Multiplier, from which equations of motion considering collisions can be formulated. After integration over time interval, it results in solving the equations of motion in impulse in the final analysis. And the numerical properties employing Newmark difference formula are also discussed in this paper.
针对接触碰撞问题，本文首先建立碰撞对速度的突加约束条件，然后引入拉格朗日乘子，应用哈密尔顿原理导出考虑碰撞的结构动力方程，最后归结到求解冲量形式的动力方程，并对采用Newmark差分格式求解时的数值特性进行了讨论。
Participated in the motion company first half year to welcomeexamines, the motion company replaces the equipment the synchronizedtest to transfer the daily test, the Chengdu network monthly reporttest, the motion group Li total Chengdu line of correspondencesafeguard, the national migration company finance and economicsconference safeguards, the motion company second half year welcomesexamines and so on many times the important task, accumulated thecertain network test optimization experience.
在此期间，参与了移动公司上半年的迎检、移动公司更换设备的同步测试转日常测试、成都市网络月报测试、移动集团李总成都行通信保障、全国移动公司财经会议保障、移动公司下半年的迎检等多次重要任务，积累了一定的网络测试优化经验。
Newton's first law of motion is not as self-evident as it may seem.
牛顿第一运动定律并不是一看就能明白的。
Explain this in terms of inertia and Newton's first law of motion.
请用所学的惯性和牛顿第一运动定律的知识作出解释。
Newton's first law of motion declares that a force is not needed to keep an object in motion.
伽利略提出一个运动的物体最终停下来是由于一种叫摩擦力的力的作用。
A coordinate system in which Newton's first law of motion is valid.
牛顿第一运动定律成立的参照系统。
Newton's first law describes the two problems:⑴ it clear the relationship between the Force and Motion.
牛顿第一定律说明了两个问题：⑴它明确了力和运动的关系。
The demonstrations at these displays and that of 1958 were impressive and breathtaking, with take-offs from and landings on a three-ton truck, first stationary and later in motion (simulating the landing platform of a naval frigate), and with rapid autorotative descents culminating in last-moment checks and brief hold-offs using rotor inertia.
在这些显示器示威，而1958年是令人难忘和激动人心的起飞和着陆在一个由3吨卡车，取舍，先固定后运动（模拟海军护卫舰升降平台），并迅速autorotative裔在最后的时刻最终检查和短暂滞留权衡使用转子惯性。
This paper studies the Characteristics of the first three spectral moment s for the response of linear systems under the space-interrelated ground motion model and an analytical method.
本文研究了在空间相关地面运动数学模型下线性体系振动反应的前三阶谱矩的特点和它们的解析计算方法。
In the first chapter, we give a brief review of some concepts of quantum vacuum fluctuations, their effects and their experimental verifications. At the same time, we also introduce the notion of the Brownian motion of charged test particles caused by vacuum fluctuations.
本文将对平面边界时空中经典常速度荷电试验粒子的随机运动展开研究，文章的结构如下：首先在第一章中，我们简略介绍了量子真空涨落的一些概念、效应及其实验检验和真空涨落引起试验粒子的布朗运动等。
Previous reports have confused views on one or two channels used in first- and second-order motion processing.
迄今为止，一阶运动和二阶运动是否通过同一通路识别尚不清楚。
We mainly discuss two generalized models: Which one is that the volatility is assumed to be stochastic and the price of the underlying asset is driven by Brown motion, so that we can propose a new generalized model of the B-S model; The other is that the volatility is assumed to be stochastic and the price of the underlying asset is a Lévy process, namely we can further promote the model on the basis of the first one.
我们主要讨论了两种推广模型：一、假设波动率是随机的，且资产价格由布朗运动驱动，得到B-S模型的一个推广；二、假设波动率是随机的，且资产价格服从Lévy过程，即在前述模型基础上作了进一步推广。
First, according to the performance index of the system, designs the mechanical entity and analyses the forward and backward solution about its motion pose and position.
本文主要完成了机械本体的设计、液压伺服系统的设计并建立了伺服控制系统的数学模型，对其仿真分析。
The features of insole pressure distribution and the techniques are in consistency, according to which some slight changes can be made to improve the insole force application. Third, in one single step, the heel area touches the ground first and then passes to the front area of the insole. The lateral front insole leaves the ground first, and then first matatarsal-phalange area leaves the ground. The maximum pressure arises mainly in the heel area or the first matatarsal-phalange area. The maximum pressure area is also the area where biggest pressure changes appear. The bigger the pressure change in motion, the more liable to get injured, and hence get more protected. Forth, in one single-step slide, with the increasing speed, the traces change of the insole pressure center on the X-axis and the Y-axis are becoming less, and the insole pressure center moves forward, with the hint that double-push helps more to keep balance in fast sliding.
足底压力分布特征与技术动作具有一致性，对于技术动作可以进行某些细微变化，从而改变足底发力特征； 3 在一个单步中，首先足跟区着地，之后过渡到足前区；前脚掌外侧首先离地，之后足跟区与第一跖趾关节区离地；最大峰值压力主要出现在足跟区或第一跖趾关节区，最大峰值压力区也是压力变化率最大区域，运动中压力变化率越大越易受到损伤，运动训练中加强防护； 4 在一个单步滑行中，随着滑行速度的增加，足底压力中心的变化轨迹在X、Y轴的位移变化幅度减小，足底压力中心表现出前移，提示在快速滑行中双蹬技术更有利于保持身体平衡。
In this article, we discuss the problem of extreme value for Brownian motion with nonlinear drift and study the distribution of the maximum value and minimum value and the first passage time.
本文研究了从x出发的非线性漂移布朗运动的极大值、极小值和首达时问题。
Therefore we must first receive your 3, 000'the denial of service deposit', if three months discovered you truly have not accepted the service in our here, we can return the deposit your - this to go with you to the motion company 销号 are same.
所以我们要先收你3000块`取消服务押金`，要是三个月后发现你确实不在我们这里接受过服务，我们就会把押金退还你——这跟你到移动公司去销号是一样的。
Then the application of these two methods in synergetic approach to pattern recognition is deeply discussed. For the first method, the Fourier transform and complex logarithm are introduced to deal with rigid motion in patterns based on synergetics, in which the effectiveness problem generated by quantization errors and the performance of the system under the condition of input patterns with noise are analyzed.
首先引入协同学基于Fourier变换和复对数坐标映射的方法处理模式的刚体运动情形，在给出一些例子的同时，分析了由于量化误差带来的识别有效性问题及如何看待试验模式受到噪声干扰时系统的性能。
According to the invention said periodical motion is effected in an imaginary plane which extends transversely to the cutting edge (23) and which has a first motion portion (89) and a second motion portion (91) following the first motion portion.
按照本发明，所述周期性运动是在一个横交于切割刃(23)而延伸的假想平面内实现的并有一第一运动部分(89)和一跟随第一运动部分的第二运动部分(91)。