目前,数字控制技术被大量应用到实际生产过程中.PLC电气控制技术具有经济、高效的特点,以此备受重视.组合机床是对于某些指定工件,根据指定工序实现批量加工的组合专用设备,此种设备具有较高的生产效率,并且机床结构较为复杂,要求电气设计稳定.基于此,文章就在组合机床中使用PLC技术,分析组合机床中PLC电气控制系统的设计和使用.
随着经济全球化进程的不断推进,经济发展也是日益强大,经济工作自然也是受到广大求职者的追捧.众所周知,高职院校与普通高校的区别在于,高职院校旨在培养具有专业技能的应用型人才,高校会计电算化课程在互联网的推进下,又进一步对广大师生与企业提出新的要求,文章将从当代高职教育中国学徒制的内涵,高职电算化人才培养的现状出发,并提出几点关于当代学徒制人才培养在高职会计电算化教学中的具体应用建议.
Ethoxyethyl cyanoacetate is a principal raw material for making the ethoxyethyl-α-cyanoacrylate instantaneous adhesive with low whitening and low oder and was synthesized using transesterification with 2-ethoxyethanol and ethyl cyanoacetate as the raw materials and dibutyltin dilaurate as catalyst.The effect of the reactant mole ratio,reaction time,and catalyst on the product yield was investigaled.The results indicated that the optimum conditions are mole ratio of 2-ethoxyethanol to ethyl cyanoacetate 2:1,mass ratio of catalyst to ethyl cyanoacetate reactant 2.5% and reaction time 10 h.The product yield can reach 85%and the purity is 97.3%.
通过二滩水电站水垫塘底板和护坦多年的抗冲磨修补工程实践,对环氧砂浆修补材料的抗冲击磨蚀性能和施工工艺等进行了持续改进,研制出一种低放热、低热变形温度、耐冲击、抗磨蚀的JME改性环氧砂浆抗冲磨修补材料。有效地解决了二滩水垫塘高温环境对施工的要求和高水头、高流速环境下水垫塘底板、护坦的薄层破损修补问题,对维护电站的安全运营起到了重要作用。
A series of waterborne polyurethane adhesives (WPUAs) for laminated composites was synthesized from isophorone diisocyanate (IPDI),polybutylene adipate (PBA),dimethylolpropionic acid (DMPA),KH550,etc.And the influences of the content of KH550 on the properties of WPUA was discussed. The results showed that when the amount of KH550 increased,the viscosity of the WPU emulsion increased and the stability of WPUA decreased gradually.Moreover,the water resistance of film was much better than that of unmodified WPUA,the tensile strength of film and the T-style peel strength of laminated composites increased when the amount of KH550 increased.
