平点

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。

Because of ICP algorithm can identify a solution regarding the correspondence problem. In this study, I use ICP algorithm to calculate the transformation parameters of overlapped strips and compare the results with other adjusted Airborne LiDAR cloud point data to evaluate its feasibility.

本文即藉由ICP演算法能处理点云间误差的特性，对光达重叠航带的点云资料加以处理，将所得的成果进而与平差处理过后的光达点云资料做分析比较，以探讨其可行性。

Using two symmetrical plano-convex lens system to fabricate grating was analyzed and the characteristic of diffraction wavefront aberration of the grating was summarized by ray tracing program using MATLAB siftware.

分析使用两个对称的单平凸透镜光路制作光栅并用MATLAB编写光线追迹程序分析了所制作的光栅的衍射波像差的特点，经计算得出在较小焦比D/F情况下其衍射波像差仅与两支光路点光源的调节偏差之差有关与单独的各个偏差无关；初级像差中球差很小几乎可忽略：彗差仅与垂轴调节偏差之差成线性关系；像散仅与轴向调节偏差之差成正比；且当平凸透镜的焦比D/F增大时，各像差项迅速增大。

In the western mining areas, when from adjustment to restriction adjustment, the original national control points are of low grade, or the points are destroyed and the surface movement is out of shape. thus, there are few control points and the reference frame conversion is a big problem in the western high elevation areas. As a result, this thesis makes a reparable design in accordance with the key problems of holing through survey.

本文就利用GPS技术测设地面近井点的网形布设、观测方法、数据处理作了相应阐述；并对由无约束平差到约束平差时，西部地区可能遇到在矿区分布的原有国家控制点往往只有低等级点，或点位遭破坏、地表移动变形等可能使可用控制点很少的情况、以及西部高海拔地区坐标系统变换问题，提出了针对贯通测量的关键问题应对方案。

Point, line, plane and other geometric elements in space can be expressed by stereographic projection according to their spatial direction and occurrence; at the same time the author can read the orientation and attitude from the stereogram, so it can be used in rock mass engineering geology widely.

赤平极射投影可表示空间上的点、直线、平面等几何要素，根据它们的空间方向和产状可以作出赤平极射投影图，同时，可以根据赤平极射投影图，测读它们的空间方向和产状，因此在岩体工程地质学中得到广泛应用。

The results indicate that when ignoring the surface energy,the relaxation degree increases with the increase of the aspect ratio regardless of the shape,among which the truncated pyramid quantum dots tend to become s...

计算结果表明，在不考虑表面能的情况下，当量子点高宽比增加时，弛豫度上升，并且发现平顶金字塔形量子点最先达到稳定；岛间距增大时，量子点内应变能下降，其中立方体形量子点应变能下降最快。

The results indicate that when ignoring the surface energy, the relaxation degree increases with the increase of the aspect ratio regardless of the shape, among which the truncated pyramid quantum dots tend to become steady earlier than others. With the increase of the inter-island distance, the strain energy in the dots decreases, especially in the cubic dots.

计算结果表明，在不考虑表面能的情况下，当量子点高宽比增加时，弛豫度上升，并且发现平顶金字塔形量子点最先达到稳定；岛间距增大时，量子点内应变能下降，其中立方体形量子点应变能下降最快。

This paper analyzes the trends and variations of cross-section profile parameters in lower Yellow River with the methods of time series analysis. The analysis results show that since 1950s, cross-section profile parameters in lower Yellow River have change with trend, especially after 1990s, the bankfull discharge and bankfull area all show decreasing trends at all the four stations. The bankfull width at Huayankou, Gaocun and Lijin station and the average depth at Huayuankou and Aishan station and the maximal depth at Gaocun station show decreasing trends while the bankfull water level at Gaocun and Aishan station and width-depth ratio at Aishan station show increasing trends.

本文采用时间序列分析的方法对黄河下游河道断面形态参数变化趋势及其变异点进行了分析，分析结果表明从20世纪50年代以来，断面形态参数发生了趋势性变化，特别是90年代以来各站平滩流量和平滩面积均有显著的下降趋势，花园口站、高村站和利津站平滩河宽出现了显著下降趋势，花园口站、艾山站平均水深显著下降，高村站和艾山站的平滩水位显著抬高，艾山站的宽深比也有显著增大的趋势。

We have researched a method of coordinate rotation of 3D converted wave data, binning and calculating 3D converted point, that is to make coordinate rotation for all seismic traces in each gather of converted wave common-shot point.

研究了三维转换波资料坐标旋转、面元划分及三维共转换点计算方法，即将每一个转换波共炮点道集内所有地震道进行坐标旋转，旋转后的转换波道集在炮检距、纵横波速度已知的条件下，用迭代方法计算三维转换点的平面坐标，并绘制在平面上。

Results? 6 cases in X-ray film revealed round or oval stones in areatus distribution in the areas of renal papillae and medulla. 3 cases of IVP revealed cystic or hair-brushed dilation. 5cases in B-ultrasound revealed little anechoic area and strong echo light spot in radial distribution with acoustic shadow. Unenhanced CT of 6 cases revealed spotted or areatus stones surrounding minor renal calices with collecting tube system dilation and enhanced CT showed artifacts of stones magnification because of the collection of contrast medium around the stones. Conclusion?

结果 X线平片检查6例，表现为肾乳头、髓质区见簇状排列的圆形、椭圆形致密影；IVP检查3例，显示肾集合管囊状、刷子状扩张；B超检查5例见肾髓质内呈放射状分布的小无回声区和强回声光点，其后方伴有声影；CT检查6例，平扫呈环绕肾小盏分布的点状或簇状钙化灶，集合管囊状扩张，增强后因钙化周围的集合管内造影剂聚集，造成钙化影增大的假象。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。