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To develop nondestructive acidity prediction for intact Fuji apples, the potential of Fourier transform near infrared (FT-NIR) method with fiber optics in interactance mode was investigated. Interactance in the 800 nm to 2619 nm region was measured for intact apples, harvested from early to late maturity stages. Spectral data were analyzed by two multivariate calibration techniques including partial least squares (PLS) and principal component regression (PCR) methods. A total of 120 Fuji apples were tested and 80 of them were used to form a calibration data set. The influences of different data preprocessing and spectra treatments were also quantified. Calibration models based on smoothing spectra were slightly worse than that based on derivative spectra, and the best result was obtained when the segment length was 5 nm and the gap size was 10 points. Depending on data preprocessing and PLS method, the best prediction model yielded correlation coefficient of determination (r^2) of 0.759,low root mean square error of prediction (RMSEP) of 0.0677, low root mean square error of calibration (RMSEC) of 0.0562. The results indicated the feasibility of FT-NIR spectral analysis for predicting apple valid acidity in a nondestructive way. 相似文献
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本文采用二次通用旋转设计,研究了新鲜糯玉米含糖量与采收期(x1)、贮藏温度(x2)、贮藏时间(x3)的关系,并组建了回归模型.结果表明:三因子的影响顺序是x3>x2>x1;其交互效应是x1x3,x2x3,表现显著.最后对模型进行模拟优化. 相似文献
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胡丽美 《内江师范学院学报》2007,22(5):114-117
抗战前后,蔗糖业是内江经济的支柱性产业.内江的蔗糖业在原料供应、制作过程、销售业务、金融融通等方面已经形成了"蔗农 糖房 漏棚"一条龙的纵向协作的"整体经营"模式.一般说来,这种模式既利于蔗农解决缺设备、缺技术、缺钱的问题,又利于糖房、漏棚解决缺原料的问题.然而,在"预买预卖"制度下,内江蔗农的利益大部分甚至完全为糖房所侵占,地位处于相对劣势,他们大多生活困苦.同时,导致蔗田土质和甘蔗含糖量亦有所降低. 相似文献