【摘要】 在钼，铬－二溴羟基苯基荧光酮－ＣＴＭＡＢ显色体系中，应用三层ＡＮＮ－ＢＰ网络解析钼和铬的吸收光谱，不经分离分光光度法同时测定钼和铬。钼和铬的表观摩尔吸光系数分别为ε５３０＝１．４×１０５Ｌｍｏｌ－１ｃｍ－１，ε５１２＝３．７×１０４Ｌｍｏｌ－１ｃｍ－１。对合金钢中钼和铬进行了同时测定，结果满意。使用改进的ＢＰ算法，避免了神经网络学习过程中可能产生的麻痹现象。提出了目标向量的简单变换方法及便于网络参数选择的收敛评价函数。更多还原

【Abstract】 In this paper,a three layer artificial neural networks were applied to simultaneous determination of molybdenum and chromium by spectrophotometry.The apparent molar absorptivities of the complex of molybdenum and chromium are 1 4×10 5 L·mol -1 ·cm -1 and 3 7×10 4 L·mol -1 ·cm -1 ,respectively.A method has been developed for simultaneous determination of molybdenum and chromium in steel with satisfactory results.The paralysis in the procedure of training about ANN has been avoided with the improved back propagation algorithms.The simple transformation method for target vectors and criterion function convenient for selection of the parameters about the networks has been put foward.更多还原