Objective:To investigate the concave angle of vertebral end-plate in low lumbar spine, and the changes of the angle during lumbar disc degeneration.
目的：研究下腰椎椎体终板的凹陷角以及它在腰椎间盘退变时的变化规律。
In this paper, we investigate a nonoverlapping domain decomposition algorithm for elliptic boundary value problems with infinite concave Angle domain.
研究无穷凹角型区域椭圆边值问题的一种非重叠型区域分解算法。
The concave angle of vertebral end-plates was significant increased from the control group and light degeneration group to severe degeneration group (P<0.05);
终板的凹陷角在对照组、腰椎间盘轻度和重度退变组逐渐增大，两两间差异有显著性（P< 0 0 5 ） ；
Firstly, a telescope system is made up with a concave lens and a long-focus convex lens, by which the angle of the parallel beam from the collimator can be change.
该方法借助一个焦距较长的凸透镜与被测凹透镜组成无焦系统，可以使准直管出射光束的张角发生改变；
By numerical simulation of a six-tooth rectangle spline, the optimized half-angle of the concave die can be got.
结合六齿矩形花键轴实际成形情况进行模拟计算，获得了入模半锥角的较佳取值范围。
Both sides of the regulation blocks are vertical planes, and the angles of the inclined planes of the other both sides are matched with the Angle of the concave module.
调整块两边为垂直面，另两边斜面角度与凹模模块角度相匹配。
Both sides of the regulation blocks are vertical planes, and the angles of the inclined planes of the other both sides are matched with the Angle of the concave module.
调整块两边为垂直面，另两边斜面角度与凹模模块角度相匹配。
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