The pulse envelope we obtained is a hyperbolic secant function of time.
所得脉冲包络为时间的双曲正割函数。
An element tangent stiffness equation was derived based on the secant stiffness equation of stability function elements with shear deformation effects considered.
以考虑剪切变形影响的稳定函数单元的割线刚度方程为基础，导出了单元切线刚度方程。
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