Critical pressures of the cylindrical Shells stiffened by rings with semi-torus section and by circular tube are calculated and compared.

算例表明，在消耗相同材料的情况下，半圆环加肋圆柱壳具有较好的抗水压性能；

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For plasma torus with elliptical cross-section, a feedback system with conducting shell and active control coils has been suggested.

我们取等离子体截面为椭圆，反馈系统由导壳和主动反馈线圈构成。

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