应用近红外光谱分析技术（Near infrared spectroscopy，NIRS）和偏最小二乘法（Partial least squares，PLS）建立棉粕中性洗涤纤维（NDF）、酸性洗涤纤维（ADF）定量分析模型，并对模型优化方法进行研究。模型的交叉验证决定系数（R^...应用近红外光谱分析技术（Near infrared spectroscopy，NIRS）和偏最小二乘法（Partial least squares，PLS）建立棉粕中性洗涤纤维（NDF）、酸性洗涤纤维（ADF）定量分析模型，并对模型优化方法进行研究。模型的交叉验证决定系数（R^2ev）分别为0．94和0．95；交叉验证标准差（RMSECV）分别为0．668和0．441；模型外部验证决定系数（R^2val）分别为0．95和0．92；外部验证标准差（RMSEP）分别为0．81和0．44。结果表明：近红外光谱法可用于棉粕中NDF和ADF含量的快速测量。建模过程中选取有效的光谱区间可以提高模型的稳健性。展开更多
The competitive adsorption and desorption of Pb（II） and Cu（II） ions in the soil of three sites in North China were investigated using single and binary metal solutions with 0.01 tool. L^-1 CaC12 as background elec...The competitive adsorption and desorption of Pb（II） and Cu（II） ions in the soil of three sites in North China were investigated using single and binary metal solutions with 0.01 tool. L^-1 CaC12 as background electrolyte. The desorption isotherms of Pb（lI） and Cu（II） were similar to the adsorption isotherms, which can be fitted well by Freundlich equation （R2 〉 0.96）. The soil in the three sites had greater sorption capacities for Pb（II） than Cu （II）, which was affected strongly by the soil characteristics. In the binary metal solution containing 1 ： 1 molar ratio of Pb（II） and Cu（II）, the total amount of Pb（II） and Cu（lI） adsorption was affected by the simultaneous presence of the two metal ions, indicating the existence of adsorption competition between the two metal ions. Fourier transform infrared （FT-IR） spectroscopy was used to investigate the interaction between soil and metal ions, and the results revealed that the carboxyl and hydroxyl groups in the soil were the main binding sites of metal ions.展开更多
文摘应用近红外光谱分析技术（Near infrared spectroscopy，NIRS）和偏最小二乘法（Partial least squares，PLS）建立棉粕中性洗涤纤维（NDF）、酸性洗涤纤维（ADF）定量分析模型，并对模型优化方法进行研究。模型的交叉验证决定系数（R^2ev）分别为0．94和0．95；交叉验证标准差（RMSECV）分别为0．668和0．441；模型外部验证决定系数（R^2val）分别为0．95和0．92；外部验证标准差（RMSEP）分别为0．81和0．44。结果表明：近红外光谱法可用于棉粕中NDF和ADF含量的快速测量。建模过程中选取有效的光谱区间可以提高模型的稳健性。
文摘The competitive adsorption and desorption of Pb（II） and Cu（II） ions in the soil of three sites in North China were investigated using single and binary metal solutions with 0.01 tool. L^-1 CaC12 as background electrolyte. The desorption isotherms of Pb（lI） and Cu（II） were similar to the adsorption isotherms, which can be fitted well by Freundlich equation （R2 〉 0.96）. The soil in the three sites had greater sorption capacities for Pb（II） than Cu （II）, which was affected strongly by the soil characteristics. In the binary metal solution containing 1 ： 1 molar ratio of Pb（II） and Cu（II）, the total amount of Pb（II） and Cu（lI） adsorption was affected by the simultaneous presence of the two metal ions, indicating the existence of adsorption competition between the two metal ions. Fourier transform infrared （FT-IR） spectroscopy was used to investigate the interaction between soil and metal ions, and the results revealed that the carboxyl and hydroxyl groups in the soil were the main binding sites of metal ions.
