三维

Visualization of 3D information can make nonrepresentational data into visual 3D image, which is important for us to analyze and understand these data.

三维信息可视化能够使抽象的三维数据转换为形象的三维图象，从而有利于分析和理解这些数据。

The main contents of this dissertation are as follows:1 A station orthogonal coordinate system, which is the reference coordinate system for the three-dimension adjustment of observation data of GPS dam deformation monitoring network, has been put forward.

主要包括内容以下：(1)提出了以站心地平坐标系作为GPS大坝三维变形监测网平差的参考坐标系，推导了在该坐标系下GPS大坝三维变形监测网平差的数学模型及公式；采用拟稳平差的方法对GPS大坝三维变形监测网观测数据进行处理。

Based on modern optimization theory and optimal control theory, this dissertation studies some questions as follows:1. The optimization model of parameter identification of three-dimensional geologic history numerical simulation, algorithm and its applicationGeologic history numerical simulation is a basic content of basin numerical simulation, and the porosity is the major parameter in the evolution and development process of oil-bearing basin. According to the sedimentation and burial mechanism, the physical and chemical principles of oil geology, the mudstone porositys non-linear parabolic partial differential equation has been established.

本文应用现代最优化及最优控制理论，对如下一些问题进行了研究： 1、三维地史数值模拟的参数辨识优化模型、算法及应用地史模拟是盆地数值模拟的一个基础性的研究内容，地层孔隙度是含油气盆地地史演化发育过程中的重要参数，根据地层沉积埋藏机理和石油地质的物理化学原理，通过引入数学物理方程概念，建立了泥岩三维孔隙度场方程，根据问题的特点，给出了方程的定解条件，对方程的动边界也给出了处理方法，并且证明了解的存在性与惟一性，在此基础上建立了以当今实测数据为拟合准则的三维地史数值模拟的参数辨识优化模型，这是一个含有二阶偏微分方程约束的泛函极值问题。

An algorithm based on triangulation is presented. First, 3D range data is projected on square domain in the plane.

首先对三维深度数据在矩形平面域上投影，并对平面域内的采样点按Delaunay优化准则进行三角剖分，然后把网格节点变换到三维曲面上，从而实现了煤堆三维立体图的显示。

Computer guided noninvasive implant: we use Three-Dimensional Computer Tomography for dental use to the pvease location. Under the help of 3D molding software,doctors can use DCT to obtain a visual 3D mode of the Alveolar bone,which facilitate implant placement、previse the Prognosis、and restoration. In this way ,doctors make implant placement and the restoration more safely and more efficiently and perhaps finish the implant therapy in only one vist .

是利用口腔专用电脑三维CT精确定位经DCT断层扫瞄，医生把这些扫描数据输入电脑三维成型软件，就能制作出可在屏幕上直观可视的三维种植体模型，这样就可预知适宜种植的部位及种植深度，预知术后的种植效果以及制作最终修复体，从而确保手术的精确度和治疗过程安全快捷，快速安装最终义齿，一次性完成种植治疗

Methods 1、Choose one fresh pelvis specimen of adult man, affirmat it is normal or not by checking it with X-ray at first; then scan it with helix CT, keep the pelvic quiescing when being scaned. Obtain series fault images of the pelvis, import the images into Mimics10.01 software and restitue 3D visible model of pelvis.

获取骨盆系列断层图像，将图像按顺序导入利用Mimics10.01软件，重建骨盆三维可视模型；再利用FreeForm软件对模型进行修饰处理，并截取髋骨模型；然后将三维髋骨以IGES格式导入有限元软件Ansys8.0进行力学参数赋值，建立髋臼三维有限元模型。

For a good 3D models retrieval system, the geometrical similarity matching method should be reckonable, and be robust to rotation, noise, model degeneracy.

对于三维模型检索系统，三维模型几何相似性比较算法要有较好的可计算性，具有较好的噪声鲁棒性，较好的网格简化鲁棒性，以及三维模型的坐标系旋转鲁棒性。

The equations of two classes of 3D polynomial maps that are equivariant with respect to the rotational symmetries of either a regular tetrahedron group or a regular octahedron group are strictly given, on the basis of which the properties of the general Julia sets created by these 3D polynomial maps are discussed and proved.

从理论上分析并证明了三维多项式映射满足等变的条件，精确地给出了关于正四面体群和正八面体群具有旋转不变对称性的两类三维等变映射的具体公式，在此基础上讨论并证明了三维多项式映射的广义Julia集所具有的性质。

It can measure peak particle, peak displacement, peak particle acceleration, frequency at the peak velocity and the resultant peak partide velocity, peak sound , and frequency at the peak sound in three dimensions.

NCSC 5300是便携式固化计算机控制的测震仪，可以调出测点的三维振动速度、振动加速度、质点振动位移、振动频率和噪声强度、噪声频率，打印出测试结果及振动频率与三维振动速度的关系图、三维振动波形图，是理想的爆破测震仪器

The scratcher three-dimensional in the UG environment is imported to ADAMS soft by the ＂parasolid＂ standard.

运用专业三维设计软件UG建立三维模型，通过Parasolid传输标准将三维模型导入专业仿真软件ADAMS中。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。