查询词典 curve in space

Level set method introduced by Osher and Sethian is a numerical method, which translates the problem of evolution of 2-D (3-D) close curve into the evolution of level set function in the space with higher dimension. Level set is an accurate and steady algorithm; it can treat with the change of topology naturally.

水平集方法是由Osher和Sethian提出的一种数值计算方法，它将二维的闭合曲线的演化问题转化为高维空间中水平集函数曲面演化的隐含方式来求解，具有拓扑结构可自然变化、计算精度高、算法稳定的特点。

We established the local theories of the curves which are in the semi-Euclidean 4-space, especially ,we considered some special ones of the timelike curve.

建立了R_2~4空间中曲线的局部理论，特别地，我们考虑了类时曲线中的一些特殊曲线。

In order to solve the shape problem of profiling processing space complex surface, general mathematical model of a wooden staircase handrail elbow end section curve has been set up, the VC and Pro/E for the staircase handrail elbow joint simulation have been used to do simulation.

为了解决依据靠模加工空间复杂曲面成型困难的问题，建立木制楼梯扶手弯头端截面曲线的通用数学模型，利用VC和Pro/E对楼梯扶手弯头进行仿真验证。

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。