与扇形法计算的效率相比，等周长法的结果偏高，等面积法的结果偏低。
As compared to the sector method, the equal-area method yields a higher fin efficiency while the equal-perimeter method gives a lower fin efficiency.
导出了极坐标系下扇形截面杆件扭转问题的差分格式；用逐次超松驰迭代法求出了扭转应力函数差分值。
A torsion difference scheme of the bar with sectorial cross-section is developed in polar coordinate system.
用扇形探测技术代替了常规的测量方法以提高矿井瞬变电磁法超前探测资料的解释精度。
Sector detection technology was used to enhance the explanation accuracy of mine transient electromagnetic method in advanced detection instead of conventional survey.
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