扭转箱形截面短柱
twisted box-section stub-column
能组转移散射截面
group transfer scattering cross section
能群移出截面
group removal cross section
内壳层电离截面
inner-shell ionization cross-section
庞加莱截面
poincare surface of section
Poincare section
the Poincare section
幂指数散射截面
general power law cross section
密绕椭圆截面螺线管
close oval-shaped spiral tube