基于单件小批企业的制造执行系统研究及优化

作为连接企业上层生产计划管理系统和底层设备控制系统之间接口的制造执行系统,是当前管理信息系统研究和开发的热点与难点。本文探讨了适用于单件小批量生产的重型机械制造企业的制造执行系统的结构框架,详细地描述了其各个功能模块的作用,并给出了实现系统优化调度的遗传算法的问题编码、遗传操作和评价函数以及算法的整个过程。按照这种框架所构建的制造执行系统,能够实现生产作业计划的实时调度以及生产过程的实时控制。     

Enhanced methane fermentation of municipal sewage sludge by microbial electrochemical systems integrated with anaerobic digestion

Sewage sludge from a municipal wastewater treatment plant was fed into a microbial electrochemical system, combined with an anaerobic digester (MES-AD), for enhanced methane production and sludge stabilization. The effect of thermally pretreating the sewage sludge on MES-AD performance was investigated. These results were compared to those obtained from control operations, in which the sludge was not pretreated or MES integration was absent. The soluble chemical oxygen demand (SCOD) in the raw sewage sludge after pretreatment was 31% higher than the SCOD in untreated sludge (5804.85 mg/L vs. 4441.46 mg/mL). The methane yield and proportion of methane in biogas generated by the MES-AD were higher than those of the control systems, regardless of the pretreatment process. The maximum methane yield (0.28 L CH₄/g COD) and methane production (1139 mL) were obtained with the MES inoculated with pretreated sewage sludge. Methane yield and production with this system using pretreated sewage were 47% and 56% higher, respectively, than those of the control (0.19 L CH₄/g COD, 730 mL). Additionally, the maximum SCOD removal (89%) and current generation were obtained with the MES inoculated with a pretreated substrate. These results suggested that sewage sludge could be efficiently stabilized with enhanced methane production by synergistic combination of MES-AD system with pretreatment process.     

企业信息化管理网络在宝钢股份HFW焊管厂的应用

介绍了宝山钢铁股份有限公司HFW焊管厂配置的信息化管理网络系统,重点对其ERP和MES系统的架构及主要模块的功能进行了描述.6年的运行实践表明,信息化管理网络系统的应用在企业快速响应市场,迅速准确地采集、传递生产信息,有效利用资源等方面起到了十分积极的作用,能够促进企业不断提高生产、经营、管理、决策的效率和水平.     

Flash技术在MES生产流程图中的应用

讲解MES生产流程图Flash应用架构,并以一个实例进行了详细说明.     

α -磺基脂肪酸甲酯钠盐在餐具 洗涤剂中的应用研究

对α-磺基脂肪酸甲酯钠盐的性能作基础研究,对其在餐具洗涤剂中的应用配方及使用效果进行了研究。研究结果显示,复配α-磺基脂肪酸甲酯钠盐的餐具洗涤剂配方,增稠性、温和性、泡沫性和去污力都有不同程度的提升。     

ERP与MES集成模式方法研究

在制造业中,随着企业资源计划(ERP)的发展,越来越多的企业开始考虑ERP与制造执行系统行(MES)之间的集成.计算机技术的发展为这两个系统的集成提供了多种方法.为了研究各种集成方法在两系统集成中的应用特点,通过比较这两个系统之间的不同集成方法,在分析ERP与MFS集成信息的基础上提出了三种系统集成模式.通过一个应用实例实现了基于一种集成方法的系统集成.     

制药行业MES网络集成制造系统的研究

针对制药企业的生产特性,依据S88及S95标准,建立基于MES(Manufacture Execution System)的生产制造系统网络集成平台,实现制药生产及经营过程DCS及ERP系统的集成,应用先进的计算机技术及管理技术改变并优化企业生产运营模式.就上述问题提出切实可行的技术方法.     

MES表面活性剂的工业化精制工艺

将α-磺基脂肪酸甲酯钠盐（MES）产品（含活性物质70%）在加热熔融的状态下滴加到50~55℃低沸点水溶性有机溶剂中,经冷却、结晶、过滤和干燥,得到高纯MES粉剂产品。考察了低沸点水溶性有机溶剂种类、原料与溶剂的投料质量比、冷却温度和结晶时间等工艺条件对产品回收率、活性物质量分数和过筛率的影响,得到了最佳纯化精制工艺：以甲醇为溶剂,5 kg MES,MES与溶剂的投料质量比为1：3,冷却温度为5℃,结晶时间为120 min,干燥时间60 min,干燥温度45℃,溶剂使用3次。本工艺条件下,所制得MES粉剂产品回收率大于98%,含活性物质量分数大于93.0%,产品在40℃密封保存12 h后,过0.850 mm筛孔的筛,过筛率达100%。     

流程工业MES体系结构及模型设计

对流程工业MES(Manufacturing Execution System)系统建模的层次、目标需求、模型特征等概念进行讨论,对现有的建模方法和模型体系结构进行比较归纳,分析其技术特点和存在的问题,并在此基础上指出流程工业MES系统体系结构和模型集成设计的发展方向,以供企业MES系统设计参考.     

Anticonvulsant activity of furanocoumarins and the essential oil obtained from the fruits of Heracleum crenatifolium

The anticonvulsant activity of furanocoumarins, coumarin mixture and the essential oil obtained from the fruits of Heracleum crenatifolium was examined against maximal electroshock (MES)-induced seizures in mice. Bergapten showed significant anticonvulsant activity. The furanocoumarins isolated from the fruits of the plant were identified using thin-layer chromatography, melting points and spectroscopic methods (IR, MS, ¹H NMR) as isobergapten (1), pimpinellin (2), bergapten (3), isopimpinellin (4), sphondin (5) and byak-angelicol (6). The essential oil content of the fruits were found as 5.5%. Twenty-two compounds representing 99.3% of the essential oil obtained from the fruits of H. crenatifolium were determined and the major components were identified as octanol and octyl acetate (3.1% and 88.4% respectively) by GC and GC–MS.