在线管理节能增效MES惠及中国制造——柴天佑院士：在线管理应当重视

由于流程和离散的帽造业最后都会面临着如何降低消耗和节能等问题，因此节能降耗对制造业而言已成一个非常核心的问题。市场竞争的加剧，国际间合作的增多，使得现在的企业更多地将如何提高自身的竞争力排在了公司决策的前列。而这其中，节能增效则是重中之重，当MES在节能降耗，提高产品质量和提高企业竞争力方面发挥的作用越来越大的时候，逐步的推进MES的研究，开发和应用，对于我国制造业来说已是必然趋势。因此“MES必将成为企业信息化不可或缺的一个重要部分”的呼声也越来越响亮。[编者按]     

在线最小二乘支持向量机及其在C8芳烃异构化建模中的应用

The least squares support vector regression (LS-SVR) is usually used for the modeling of single output system, but it is not well suitable for the actual multi-input-multi-output system. The paper aims at the modeling of multi-output systems by LS-SVR. The multi-output LS-SVR is derived in detail. To avoid the inversion of large matrix, the recursive algorithm of the parameters is given, which makes the online algorithm of LS-SVR practical. Since the computing time increases with the number of training samples, the sparseness is studied based on the projection of online LS-SVR. The residual of projection less than a threshold is omitted, so that a lot of samples are kept out of the training set and the sparseness is obtained. The standard LS-SVR, nonsparse online LS-SVR and sparse online LS-SVR with different threshold are used for modeling the isomerization of C8 aromatics. The root-mean-square-error (RMSE), number of support vectors and running time of three algorithms are compared and the result indicates that the performance of sparse online LS-SVR is more favorable.     

一种对预测控制系统经济性能评估的实用方法及其工业应用

In this article, an approach for economic performance assessment of model predictive control (MPC) system is presented. The method builds on steady-state economic optimization techniques and uses the linear quadratic Gaussian (LQG) benchmark other than conventional minimum variance control (MVC) to estimate the potential of reduction in variance. The LQG control is a more practical performance benchmark compared to MVC for performance assessment since it considers input variance and output variance, and it thus provides a desired basis for determining the theoretical maximum economic benefit potential arising from variability reduction. Combining the LQG benchmark directly with benefit potential of MPC control system, both the economic benefit and the op-timal operation condition can be obtained by solving the economic optimization problem. The proposed algorithm is illustrated by simulated example as well as application to economic performance assessment of an industrial model predictive control system.     

HSE的网络管理--原理与实现

从网络管理的一般概念出发,引入了HSE网络管理.详细介绍了HSE网络管理的概念、原理,并对其实现给出了说明.     

太湖蟹加工过程中呈味核苷酸变化规律研究

研究太湖蟹在加工储藏过程中呈味核苷酸的变化规律,以期为太湖蟹加工企业提供科学有效的加工方式。结果表明,太湖蟹中呈味核苷酸受储藏温度、蒸煮、腌制等加工方式的影响,随着降解和生成的速率不同,其含量发生显著的变化。最佳储藏条件为-18℃,蒸煮时间为10 min~12 min,腌制过程中呈味核苷酸快速降解,ATP及其关联物的降解产生的各种滋味氨基酸、肽及有机酸的协同作用,使得腌制蟹具有特有的风味。     

基于UPLC-MS/MS探究烘焙程度对咖啡豆中有机酸含量影响

为探究烘焙工艺对咖啡豆口感的影响,本文研究了烘焙程度对咖啡豆中有机酸含量的影响。采用新建立超高效液质联用法（UPLC-MS/MS）测定不同烘焙条件下7种有机酸的含量。结果表明:7种有机酸化合物在0.5～20.0 mg/kg范围内线性关系良好,决定系数均大于0.990。7种有机酸的加标回收率在81.9%～104.7%,RSD为0.53%～6.64%。洪都拉斯咖啡豆样品检测结果显示随烘焙程度增加,苹果酸和柠檬酸含量下降,富马酸含量先升后降,琥珀酸、酒石酸、莽草酸和奎尼酸含量上升。轻度烘焙下苹果酸与柠檬酸总量最高,达到1201.5 mg/kg,酸度最佳;奎尼酸含量最少,为1363.7 mg/kg,涩度最低。肯尼亚、印尼、巴西、萨尔瓦多咖啡豆中有机酸在相同烘焙条件下表现相似。