它的局部是凸的，因为它没有环路，且曲率永远不会改变符号。
It is locally convex in the sense that it has no loops and the curvature never changes sign.
轻拍镜框上的滑轮构件挤压液体，从而改变薄膜的曲率聚焦远近不同的物体。
Flicking the slider mechanism built into the bridge squeezes the liquid, changing the curvature of the membrane to bring nearby or faraway objects into focus.
为了获取一个内焦距放大的图像，研究人员开动液压装置，改变透镜曲率，以协调方式改变检测器。
To achieve an in-focus and magnified image, the researchers actuate the hydraulics to change the curvatures of the lens and detector in a coordinated manner.
检测器的形状必须与图像表面改变的曲率匹配，以适应持续调整的变焦镜头的变化，而这，用这种新型的半球眼式相机可轻易做到。
The shape of the detector must match the varying curvature of the image surface to accommodate continuously adjustable zoom, and this is easily done with this new hemispherical eye camera.
从相邻单元曲率的改变趋势，能够判别出测地线的大致走向。
From the changing trend of the curvature of adjacent elements, the general trend of geodesic lines can be determined.
这是一种无痛、无创伤的疗法，通过佩戴一种可以改变角膜的曲率的硬性隐形眼镜来达到矫治散光的目的。
It is a painless, non-invasive procedure that involves wearing a series of specially designed rigid contact lenses to gradually reshape the curvature of the cornea.
当一个球面曲率引入基底时需要有什么改变？
What changes are necessary when a spherical curvature is introduced in the substrate?
通过一个10层剪切型框架结构的数值分析表明，振型曲率的改变不能正确识别结构损伤位置；
Some useful results were obtained by a numerical simulation of a 10-story shear-type frame structure. Damage can not be located correctly through the changes in mode shape curvature.
由计算结果可以得到，几何非对称结构对多频率段降噪效果好，而改变壳面的曲率半径对壳的固有频率提高较大。
Based on results, the geometrical asymmetry shell has obvious effect about reducing noise in large range of frequencies, and change radius of curvature can increase eigenfrequency obviously.
IOP的升高改变了巩膜的曲率而不改变角膜的。
Elevation of IOP changes the curvature of the sclera but not that of the cornea.
提出的内凹的盘铣刀铣可加工凹曲面又加工凸曲面。通过改变刀盘曲轴线与曲面的截线和刀盘半径有相同的曲率和曲率导数。
This paper presents a new method in which the disc cutter always has the same curvature and the curvature differential with that of the surfaces being machined.
求解该方程时，将纵向位移分量和曲率的改变量用挠度表示。
The longitudinal displacement and curvature variation are both described by deflection as solving the equations.
目的：研究激光角膜原位磨镶术(LASIK)前后，角膜后表面屈光度及曲率半径的改变以及影响因素。
Objective: to investigate the changes in the posterior corneal surface topography after LASIK and the factors that influence the results.
目的：研究激光角膜原位磨镶术(LASIK)前后，角膜后表面屈光度及曲率半径的改变以及影响因素。
Objective: to investigate the changes in the posterior corneal surface topography after LASIK and the factors that influence the results.
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