查询词典 planar developable surface

In an ultrahigh vacuum chamber with a base pressure of 1 x 10-10 torr, we have used Low Energy Electron Diffraction and Temperature Programmed Auger to study the effect of adsorbates on the surface structure of Nb(111). That is, in O/Nb(111) systems, we observe the structure of the surface with LEED to see if any surface reconstruction occurs after annealing and analyze the structure.

在超高真空(约1 x 10-10 torr)的环境下，我们利用了低能量电子绕射(Low Energy Electron Diffraction， LEED)、可程式控温欧杰能谱(Temperature Programmed Auger， TPA)，来研究氧覆盖层对於铌基板的影响，亦即PO/Nb(111)表面系统中，再利用LEED观察是否有任何表面重构的现象发生并详细分析此结构。

To explore the mechanisms responsible for formation and variation of O3 at the surface, the variation characteristics of the surface O3 over Waliguan had been analyzed based on near eight years of continuous observations of surface O3 at Waliguan atmospheric baseline observatory from 1994 to 2002, combined with the Waliguan CO data and O3 and CO data of other three near high elevation globe background stations, Mauna Loa, Jungfraujoch and Izaa in the same period.

为探讨地面O3生成和变化机制，利用青海省瓦里关大气本底基准观象台1994~2002年的地面O3连续观测资料，结合同期瓦里关CO数据及3个相近高海拔全球背景站点Mauna Loa， Jungfraujoch， Izaa的O3和CO资料，对瓦里关地面O3变化特征进行分析。

In the fifth section, we obtain some sufficient conditions under which a class of a planar quintic system has at most two limit cycles by transforming it into Abel equation.

第五章讨论了一类可化为Abel方程的五次多项式系统的极限环的个数，得到此类平面五次多项式系统至多存在两个极限环的充分条件。

This paper presents an adjacency matrix method for identifying topological symmetry to planar kinematic chain s with multiple joints.

提出了识别含复铰平面运动链拓扑对称性的邻接矩阵方法。

Among the objects as the principle of geometric perspective and aerial perspective, and make it conveying deep stereo spatial feeling on planar painting.

在绘画中，依照几何透视和空气透视的原理，描绘出物体之间的远近、层次、穿插等关系，使之在平面的绘画上传达出有深度的立体的空间感觉。

The chaotic planar motion of rigid spacecraft on an elliptic orbit in the gravitational field with air drag and internal damping and its control are investigated.

研究万有引力场中受大气阻力且存在结构内阻尼的非自旋航天器在椭圆轨道上平面天平动的混沌及其参数开闭环控制问题。

And planar algebraic curve is an important research object and tool.

而代数曲线又是非常重要的研究对象和王具。

Given a planar point set,the moving least squaremethod is adopted to denoise and resample it so that the resulting point set is with low noise and uniform sampling density.Then the reliable signed distance field of the preprocessed point set is constructed by using the Level Set method.Finally,an algebraic B-spline function is adopted to fit the signed distance field by solving a linear equation system.

首先给定一个表示封闭曲线、可能带有噪音且分布不均匀的平面点云，采用移动最小平方(moving least square，简称MLS)方法对点云去噪、重采样，得到一个低噪音、分布均匀的"线状"点云，再通过Level Set方法建立该"线状"点云的离散几何距离场，最后用一个代数B-样条函数光顺拟合该离散距离场，代数函数的零点集即为重建曲线。

Furthermore, people found that the relationship between intrinsic properties of planar algebraic curves and the singularity ofbivariate spline spaces is m-ore and more important.

尤其是经过近年来的研究，人们发现多元样条空间的奇异性问题与代数曲线的内在性质有着越来越重要的关系。

Tablets pavilions for the planar three square, double eaves and Xieshan Ding, Shan Alice Shan Ang under eaves, on a single Alice Shigetaka eaves, yellow green glazed tile roof trim cover.

碑亭为平面三间方型，重檐歇山顶，下檐单翘单昂，上檐单翘重昂，黄琉璃瓦绿剪边覆顶。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。