In the previous works only the uniform wall-thickness elbows were studied.However, the elbow thickness is varied with the bending radius and ellipticity on the cross section. 以往對彎頭的研究只考慮壁厚均勻不變的情況，但是實際上彎頭的壁厚是沿著彎曲半徑變化的，並且彎頭的截面也具有一定的橢圓度。
The imaginary part of the optical potential has a certain effect on the calculated cross sections for the larger scattering angular region. 摺疊模型光學勢的虛部對小射角區影響很小，但對大射角區的截面計算有一定的影響。
