建立紫外-可见-短波近红外漫反射光谱结合化学计量学测定白芷中二氧化硫残留量的方法。利用紫外-可见-短波近红外漫反射光谱技术并结合化学计量学建模预测二氧化硫残留量。偏最小二乘回归法(PLSR)建模优于支持向量回归法(SVR); Random F...建立紫外-可见-短波近红外漫反射光谱结合化学计量学测定白芷中二氧化硫残留量的方法。利用紫外-可见-短波近红外漫反射光谱技术并结合化学计量学建模预测二氧化硫残留量。偏最小二乘回归法(PLSR)建模优于支持向量回归法(SVR); Random Frog波段选择结合Auto-scaling预处理后PLS建模后预测效果最佳,校正集R^2为0. 99,交叉验证集R^2为0. 94,预测集R^2为0. 96。紫外-可见-短波近红外漫反射光谱结合化学计量学可以实现二氧化硫残留量的快速检测,为中药饮片的质量评价及监管提供一种技术手段。展开更多
In this paper,the method of UV-visible reflection spectrum（UV method） was theoretically and experimentally proposed to investigate the initial kinetic characters of the solid-solid reaction with the mixture of dimet...In this paper,the method of UV-visible reflection spectrum（UV method） was theoretically and experimentally proposed to investigate the initial kinetic characters of the solid-solid reaction with the mixture of dimethylglyoxime and Ni（Ac）2·4H2O,and the mixture of dimethylglyoxime and anhydrous Ni（Ac）2 as the modeling reaction examples.The results indicated that the UV method was very sensitive in the initial period of solid-solid reaction.The reactive rates for above two reaction systems were varied non-linearly with the change of reaction time.The fastest reaction rates can be reasonably explained by the formation of the cold-melting layer or cold-dissolvingmelting layer.展开更多
文摘In this paper,the method of UV-visible reflection spectrum（UV method） was theoretically and experimentally proposed to investigate the initial kinetic characters of the solid-solid reaction with the mixture of dimethylglyoxime and Ni（Ac）2·4H2O,and the mixture of dimethylglyoxime and anhydrous Ni（Ac）2 as the modeling reaction examples.The results indicated that the UV method was very sensitive in the initial period of solid-solid reaction.The reactive rates for above two reaction systems were varied non-linearly with the change of reaction time.The fastest reaction rates can be reasonably explained by the formation of the cold-melting layer or cold-dissolvingmelting layer.
