采样分布

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。

Inverse Distance Weighted method is sensitive to the distance and circle distributions are found around sampling point. IDW is an accurate interpolation method in case of the field information diffused from some center points.

距离反比法插值对距离比较敏感，出现很多以采样点为中心的圆形分布，在以点为中心呈扩散状分布的农田信息，采用距离反比法具有较好的插值效果。

The adopt the analytical method announced by environmental protection administration NIEA A715.12B "volatile organic compounds detection method at air - stainless steel canister/analyze mass spectrograph of gaseous phase ", to effectively analyze the air samples inside the station, to find out the space distribution and concentration of volatile organic compounds at the service station.

研究分析方法采用环保署公告NIEA A715.12B「空气中挥发性有机物检测方法－不袗采样筒/气相层析质谱仪法」，期望有效分析加油站内空气样品，对站内空气中各挥发性有机物物种进行定性与定量分析，以了解站内挥发性有机物空间分布与浓度分布情况，提供国内相关资料库与相关立法规范参考。

The distribution of gas-solid two-phase flow in the axial guide vane cyclone tube was measured with five-orifice pitot tube and by means of isokinetic sampling method.

为研究颗粒分离机理，提高分离性能，采用五孔球探针测试仪及等动采样法对轴流导叶式旋风管内气固两相流速度与压力分布进行了测量，并分别对不同导流锥和排尘结构参数下的纯气流流场及颗粒浓度场分布进行了对比分析。

It inherits the advantage of PF, representing multiple uni-modal distribution instead of calculating probability distribution function explicitly.

该方法继承PF的优点，不需要直接求解概率分布函数，而是用随机采样得到的样本集合来表示机器人的位姿信度分布及其不确定性。

This part has studied on such features of GPS data as time and spatial distribution, sampling intervals, distribution of samples and the coverage rate of road network.

论文主要研究了深圳市GPS数据的时间和空间分布特征、GPS采样间隔特征、路段样本量分布特征、路网覆盖率特征以及路网覆盖率与出租车数量之间的关系。

The AVS-SEM distribution in the sediments of Guanting Reservoir and Yongding River was studied and the metal concentration in the water above the sediments and the pore water was measured. Based on the results, the reaction between the sediments and metal ions were discussed and the heavy metal pollution of the sediments in Guanting Reservoir and Yongding River was evaluated preliminarily.

官厅水库沉积物，由于处于缺氧性环境，沉积物中的酸可挥发性硫化物控制着大多数金属离子在沉积物和孔隙水两相间的分配，本文通过现场采样，分析了官厅水库和永定河沉积物中的AVS—SEM的分布，同时测定了沉积物上覆水以及部分样点的孔隙水中的重金属浓度，探讨了沉积物与重金属离子的作用；并根据采样分析结果对官厅水库及永定河沉积物中的重金属污染做了初步评价。

In chapter Ⅰ, a historial review of structure control is given; In chapter Ⅱ, A discussion of the controllability and observablity of flexible structures is given, Two kinds of controllability and observablity index are defined, and applied to actuator allocation; chapter Ⅲ considers the reduction of high order flexible structure mode; the content of chapter Ⅳ is about the basic problem of distributed parameter control system design. It is proved that a stable controllor in mode space may be unstable in real use in distributed paramater systems, also, by closed loop mode concept, a pole assignment method of flexible structure controllor design is given; chapter Ⅴ is about the low-authority controllor design, it is pointed out by use of high order eigenvalue/eigenvector perturbation, a better controllor can be designed; chapter Ⅳ considers flexible structure reduced order control; chapter Ⅶ disscusses the basic problem of flexible structure computer control, analyses discreate controllablity and observablity and its computing, the sample period and coefficient wordlength; chapter Ⅷ is on the problem of low flexibility compensation; chapter Ⅸ is a design example.

在第一章简要回顾了挠性结构控制的历史，并且指出控制中的一些问题；第二章讨论了挠性结构的能控性与能观性，定义了两类能控性程度和能观性程度指标，还将能控性程度概念应用于执行器位置的确定；第三章论述了高阶模型的降价问题，比较了适于挠性结构模型降阶的方法，指出其适用范围；第四章内容是分布参数系统设计的基本问题，首先证明在模态空间中设计的稳定的控制器在实际分布系统上可能是不稳定的，进而根据闭环模态的概念，获得挠性结构控制器设计的极点配置方法；第五章的内容是关于低权控制器的设计问题，指出利用特征值高价摄动和特征向量的摄动，可以设计出更加完善的低权控制器；第六章讨论挠性结构降阶控制问题；第七章讨论挠性结构计算机控制的基本问题，分析了时间离散化模型的能控性和能观性及其计算问题，讨论了采样周期选择和系数字长问题；第八章讨论低挠性结构的补偿问题；第九章的设计例子用来说明第二章和第四章的结果。

When the viewpoint is changing quickly, the rendering algorithm ignores some details of the diffuse component, otherwise the scene is rendered more precisely. The Specula highlight is dependent of the viewpoint, it must be processed in real time. We present an algorithm to get rid of the area that does not contain specula highlight quickly and calculate only the area that contains the specula highlight. In order to calculate the specula reflection and refraction component, we presented a new raytracing algorithm based on the environment map transformation. The environment maps are constructed at the sample points of the scene in the preprocessing phase. We add depth information in the environment maps and generate the exact reflection and refraction intensity with the transformation of a few pixels.

对于表面光亮度漫射分量，由于它与视点无关，可以把面片按照光照细节的分布预剖分成层次结构，然后在实时漫游时根据场景变化的快慢决定绘制的细致程度；对于镜面高光分量，由于它与视点有关，必须实时处理，我们提出了一种快速高光裁剪算法，通过简单测试，去除那些不包含高光的区域，只处理包含高光的区域；对于镜面反射分量和折射分量，我们提出了一种基于环境映照变换的快速光线跟踪算法，预先在场景的离散采样点处建立环境映照，然后根据入射点的位置，把邻近采样点处的环境映照上相关象素处的可见点变换过来，求取反射分量和折射分量。

The particle size distributions in Beijing collected in a normal weather period, a dust storm arrived from remote area and the local dust storm arising were measured by PIXE combined with a multi-stage sampler, and the change of the concentration of particulates with time was obtained by PIXE combined with a auto-step time sequence sampler.

用PIXE分析技术结合分级采样器测量了正常天气、远处沙尘暴到达时和局地扬尘起来时北京的大气颗粒物粒径分布谱，与时间序列自动采样器相结合，得到了大气颗粒物浓度随时间的变化，通过受体模型计算得到大气颗粒物来源及其贡献率。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。