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The mineral particles are classified in different textural classes according to their size. Reflectance spectrometry and spectra can be valid instruments to classify the soils according to their texture. This is possible using different statistical methods, for example, discriminant analysis. However, other multivariate methods, like multinomial logistic regression, can be used, but the presence of multicollinearity among explicative variables could affect the estimation of the parameters. The solution proposed to remedy this problem is an alternative way to apply the multinomial logit model. To evaluate its performances, we compare the results with both classical multinomial logit and discriminant analysis ones. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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电感耦合等离子体原子发射光谱法测定马奶酒中的多种元素 总被引:2,自引:0,他引:2
电感耦合等离子体原子发射光谱法测定马奶酒中的多种元素嘎日迪,乌地(内蒙古师范大学化学系,配位化学研究所,呼和浩特,010022)关键词电感耦合等离子体原子发射光谱,马奶酒,微量金属元素蒙古民族喜爱的传统饮料──马奶酒(蒙语“策格”)是用鲜马奶为原料发... 相似文献
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基于结构方程(SEM)理论,以2008年统计数据为样本对影响城市现代化的测量指标进行了一阶、二阶验证性因素分析,得到了结构方程模型.并以测量指标在因子上的负荷、路径系数为基础构建权重,建立了城市现代化水平综合评价模型.对我国重要城市(直辖市、主要省会城市)现代化水平程度进行了相对评价,得到较为满意的结果. 相似文献
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Droplet aggregation is an important cause of instability in emulsions because it may, on one hand, lead to an increased creaming rate, resulting in fast separation of a concentrated emulsion phase (creamed layer). On the other hand, it may also lead to the formation of a stabilizing, droplet-based network. Early detection of instability is often difficult due to the high turbidity and viscosity of more concentrated food emulsions. The applicability of diffusing-wave spectroscopy (DWS) for monitoring droplet aggregation and creaming was studied using a model system consisting of a protein-stabilized emulsion, to which a soluble polymer ("thickener") was added. This addition leads to an increased solvent viscosity and may induce droplet aggregation. In addition, the redistribution process of emulsion droplets in aggregating concentrated emulsions was directly observed by confocal scanning laser microscopy (CSLM). By DWS the decrease of the droplet mobility caused by the viscosity increase of the continuous phase could be separated from the effect of droplet aggregation. Moreover, a distinction could be made between aggregation, leading to increased creaming rates and that leading to the formation of a stabilizing droplet network. The potential of DWS for in situ measurement of the stability of concentrated emulsions is discussed. Copyright 2000 Academic Press. 相似文献
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研究了铁(Ⅲ)和钼(Ⅵ)与邻苯二酚在pH 6.20 微酸性介质中反应生成的有色配合物与717型强碱性阴离子交换树脂的交换吸附,探讨了树脂相分光光度法同时测定铁(Ⅲ)和钼(Ⅵ)的实验条件。铁(Ⅲ)和钼(Ⅵ)树脂相有色配合物的最大吸收波长分别为520 nm 和400 nm ,表观摩尔吸光系数ε为4.1×104 L/(m ol·cm )和9.0×104 L/(m ol·cm ),符合Beer定律的范围为0~2.2 m g·L- 1和0~1.6 m g·L- 1。此法用于地下水中微量铁和钼的测定,相对标准偏差为3.3 % 和3.2 % 。 相似文献