ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

158 samples of comminuted green tea were scanned by the near infrared spectroscopy analyzers. Using orthogonal experimental design, the calibration models of free amino acids content in green tea were gained with the correction methods of PCR, PLS and MPLS under different spectral data preprocessing methods separately. The models were evaluated by the objective function method. The optimal correction methods and spectral data preprocessing methods were determined, and the applicability of the models was validated. The experimental result is that using MPLS could get the optimal model. And its spectral data preprocessing method is SNV+Detrend, 1, 1, 4, 4. Its objective function value is 94.25%; the relative standard deviation of validation is 6.39% (less than 10%). The results showed that using orthogonal experiment design could comprehensively evaluate the different correction methods and spectral data preprocessing methods on the models, and NIRS could achieve quantitative and fast detection of free amino acids content in green tea. 