核桃是重要的木本粮油果树,具有较高的经济价值,在我市有悠久的栽培历史,该树种抗旱、耐瘠薄,多分布于北部山区,由于生长期长,结果......

本文在大学物理范围内，仅用高等数学知识，详述质点余弦振动的传递过程；由谐波定义出发，导出机械简谐纵波的波动方程；并明确谐波中介质运......

The aim of this paper is to investigate the numerical solution of the hypersingular integral equation reduced by the har......

Based on the variation and harmonic equations and by taking the maximum amplitude of the shell center as the perturbatio......