曲面

A typical 3-RPS parallel platform manipulator mechanism is firstly studied by means of the above theory. The principal screws of this mechanism under three different configurations are identified by means of the conic section and the quadric degenerating theory, respectively.

以上述理论为武器首先分析典型的3-RPS并联平台机构，分别应用二次曲线分解理论和二次曲面分解理论，识别了该机构在三种位形下的主螺旋。

Another new spatial 3-RPS parallel pyramid manipulator mechanism is studied. The principal screws of this mechanism under three different configurations are identified by means of the conic section and the quadric degenerating theory, respectively. The planar conics representing the relations between the pitches of the output twists and the three linear inputs are described, and the three-dimensional distribution of the axes of all the twists with the same pitch is illustrated under each of the configurations.

研究了另一种新的空间三自由度3-RPS并联角台机构，分别用二次曲线和二次曲面分解法识别该机构在三种位形下的主螺旋，绘制了其在每种位形下的输出运动螺旋的节距与输入之间的平面图以及具有相同节距的所有运动螺旋轴线在每种位形下的空间分布的立体图。

Edge node conics to span entire geometry of cones, cylinders, rectangles, spheres, or paraboloids

边节点曲面能在锥面、柱面、立方体、球面或抛物面间的整个空间沿展成体

Secondly, it analyses the line type between stator and rotor of PDM, gets its derivation bone line equation that satisfies the motor conjugate line type of theoretical sealing and the equation of curved surface, and determines its basic processing method and technology according to the line type characteristic of the spiral curve through analyzing some kinds of typical spiral curve processing methods.

其次，对螺杆钻具定子与转子进行线型分析，推导出其满足理论密封性的马达共轭线型的骨线方程和曲面方程，根据螺杆钻具定子内孔螺旋曲线的线型特点，在分析了几种典型的加工螺旋曲线加工方法的基础上，确定了其基本的加工方法和工艺。

Aximum intensity projection,curved planar reformation and volume rendering were used conjunctively to observe morphological changes of the coronary arteries,such as atherosclerotic plaques and compression.

B-MCA及邻近冠状动脉形态学的观察：采用多平面重组、曲面重组、容积再现多种后处理技术相结合观察MCA近端及远端粥样硬化的发生率。3。

METHODS: Digital panoramic radiograph were taken, standardized exposure measurements were performed to ensure the consilience of different subjects.

摄取数字式曲面体层片，并采取标准化措施用于保证不同个体的一致性。

Her breasts and buttocks illustrated Enneper's surface of negative constant curve, the differential coefficient of the pseudo-sphere.

她的双乳和臀部是艾纳帕的负恒曲面图和伪球面的导数。

The experimental results demonstrate that the prototype system based on this algorithm can conveniently and intuitively construct complex free form surfaces.

实验结果表明，基于该算法的原型系统能够方便、直观地构造复杂的自由曲面。

To construct the parameterization form of reconstruction surface, a new algorithm for the planar parameterization of quadrilateral meshes is presented.

4提出了基于网格简化的四边形网格参数化算法，为构造重建网格的参数曲面提供了新方法。

For combined Bezier curves case, after we strictly analyze the shape blending process, we introduce the balance geometric continuity condition to ensure the shape feature and give a set of logical solutions.

作者进一步分析了基于参数曲面片拼接技术的形状调配过程的困难性，从而引出随后的细分方法研究。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。