三维

The guidance system is built according to the relative relationship in three dimensions. For longitudinal plane, by introducing the subsidiary smooth function, the attraction domain of sliding mode are analyzed and determined, and the stability of the guidance system is proven, considering from the coupling relations of two planes in three dimensions.

根据末端三维弹目相对运动学关系，建立了三维制导系统的数学模型，并以纵向平面模型和变结构控制中到达条件为基础，引入分段光滑连续函数，以三维平面间的耦合关系为出发点，从两个方面分析并确定了过载受限变结构制导律的滑动模态吸引区，证明其制导系统的稳定性。

Images are generated within a region of 3D space which breaks the durance of plane display.It will lead science visulization to a new development direction.

真三维立体显示技术是一种全新的三维图像显示技术，在三维立体空间对物体成像，突破了平面显示的禁锢，它将引领科学可视化进入崭新的发展方向。

The equation and the mathematical model are acquired just after studying of the theory of gearing, and the mathematical model also result from the actual manufacturing method. Then, the paper accomplish the accurately 3D-modeling of the four generally used types of gears: cylindrical spur gean cylindrical helical gean straight bevel gear and curved-tooth bevel gear.

利用具有强大三维造型功能的工程软件实现了四种常见齿轮：圆柱直齿轮、圆柱斜齿轮、直齿锥齿轮和弧齿锥齿轮的三维造型，解决了齿轮的精确三维建模难题。

In working, the tube via tube hoop is connected to the upper bottom plate (2); the lower bottom plate (3) is fixed to the groundsill; when the tube is vibrated, the distortion of spring can damp and adsorb the three-dimensional vibration of tube. The invention has lower natural frequency and wider temperature application, with simple structure and easy maintenance.

工作时，需减振的管道通过管箍与本发明所述的三维减振器的上底板(2)固接，三维减振器的下底板(3)与地基固接，当管道产生振动时，通过弹簧的变形来减小和吸收管道的三维振动，达到减振的目的，它具有较低的固有频率和较大的使用温度范围，具有结构简单可靠、安装方便、维护简便的优点。

Explore and improve the method of performing biomechanics experiment with digitalization mechanics model. 1、Construct 3D finite element model of normal acetabulum: Scan the pelvic example of human body with CT, restitution three-dimensional visible haunch bone with correlated software; investigate the method of 3D image reconstruction with plane images.

正常髋臼三维有限元模型的构建：通过对大体标本进行薄层CT扫描，利用相关软件重建三维可视髋臼，研究利用平面图像重建高仿真三维影像的方法；再利用有限元分析软件将髋臼力学参数赋值于可视模型上，使其具备力学性能，同时研究如何改进赋值方法，使有限元模型力学性能更接近于大体标本。

What are discussed importantly are terrain matching base on remote sensing,DEM,and fractal,skybox model base on hemispheroid grid,track filtering arithmetic,fog designing base on particle systems,etc.

战场场景管理模块主要用于虚拟三维场景的创建和管理，主要包括地形匹配、天空体匹配、高炮和导弹战车三维模型和空情三维模型的处理等。

By projecting 3D models into 1D smooth principal curves, equally segmentation and sampling along the length of curve are implemented to extract shape feature vectors, then one can retrieve 3D model according to the matching result of shape feature vectors of 1D manifold.

本文将三维网格模型，投影为三维的光顺主曲线；通过对主曲线沿弧长方向的均匀分割采样，提取主曲线的空间位置和姿态等形状特征；最后通过形状描述向量的比较实现了对应的三维模型检索。

3D model may be manipulated so that its shape could be observed from any view, and is displayed on the screen by static state and dynamic. The property of volume and the moment of inertia matrix are obtained from the octree of object by the algorithms presented in this dissertation. To fit the application of recognition, we studies the method by which 3D model octree is used for recognition.

作者研究了对重建飞机三维形体的旋转和操作，提出了飞机体积及惯性矩的计算算法，并利用计算机图形学技术，对重建的飞机三维形体进行了静态和动态显示，论文对重建的飞机三维模型用于识别的方法进行了探索性的研究。

Firstly, the stope vacancy was monitored using CMS, taking cavity measured data as foundation, cavity three-dimensional model of the stope opening was created using Surpac software and gain the stope three-dimensional configuration and the actual boundary accurately. Then, the stope designed model and ore-rock interface digital terrain model were established according to the stope design material. Finally, using ore-rock interface DTM to cut cavity model or through Boolean calculation among the models, ore remains, mining total volume, mullock, backfilling, pure ore and dilution rate of stope N3-4 were calculated accurately, thus the large-scale stope mining index visible calculation was realized effectively.

采用CMS探测三维采场空区，以空区实测数据为基础运用Surpac构建采空区三维可视化模型，获取采场空区的三维形态和实际边界；运用采场设计资料，建立采场回采设计模型及矿岩边界模型，通过模型间的布尔运算，计算出采场存留矿量、回采总体积、采下废石量、采下充填体量、采下纯矿石量、回采总量及回采贫化率等，从而有效地实现了大规模采场回采指标的可视化计算。

Methods: 12 fresh frozen shank-foot specimens from young adults were observed. The tibia was fixed rigidly. The talus and navicular were marked. We exerted different load on the forefoot for keeping it in different motion patterns and measured the three-dimensional coordinates of the marked points on these bones. The relative 3D motion range of the talonavicular joint was calculated. The characteristics of the talonavicular joint and the forefoot and their relationship were analyzed.

采用12例新鲜青壮年小腿足标本，牢固地固定胫骨，标记距骨和足舟骨，分别对足前部加载不同的负荷，使前足处于特定的不同运动状态，用三维数字化仪测量标记点的三维坐标值，计算距舟关节的相对三维运动值，分析距舟关节和前足的运动范围及两者间的关系。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。