是指发光强度值为轴向强度值一半的方向与发光轴向（法向）的夹角。半值角的2 倍为视角（或称半功率角）。
在弹性半无限体理论空间解的基础上导出了应力扩散角的建议值。
Based on the spacial solution of the elastic semiinfinite element theory, the suggested value of the stress spread Angle has been derived.
在将粘性影响线性处理后，采用迭代法求解半潜船在规则波中的运动幅值和相位角。
The motion amplitude and phase Angle of a semi-submersible in regular waves are solved by means of iteration method after the non-linear viscous effect was processed linearly.
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