【摘要】 误差反向传播神经（ＢＰ）网络存在学习速度较慢、易陷入局部极小等缺点。通过自适应步长、反传改进参数γ、数据预处理和权值初始化等改良ＢＰ网络，使标准ＢＰ算法收敛速度大大加快，收敛平稳性获得提高。方法用于钙、镁、铁的三组分混合物同时定量分析，取得一定效果。更多还原

【Abstract】 A new modified backpropagation neural network method is proposed based on a novel varying steplength, modified network parameters and data pretreatment. The learning and the convergent stability of this new network have increased. The method is used for simultaneous analysis of Ca, Mg and Fe elements in synthetic samples with satisfactory results更多还原