Evaluation and verification of the virgin–recycled mixing ratio of polypropylene plastic

This study has analyzed the properties of blended polypropylene (PP) specimens and employed statistical analysis to develop a method for determining the virgin–recycled mixing ratio of a specimen. Morphological observations and analyses of thermal and mechanical properties were conducted to examine specimen properties. The results were incorporated into regression analysis to create relationship equations. The results revealed that the melt temperature ranged between 167 and 169 °C, melt index (MI) ranged between 7.59 and 18.36 g/10 min, viscosity decreased when the amount of recycled PP and the rotation speed increased, the maximum decomposition temperature decreased with an increase in recycled PP content and increased with the heating rate, activation energy (E_a) ranged between 39.91 and 12.07 kcal/mol, Young’s modulus ranged between 1121.1 and 1910.2 MPa, and impact strength ranged between 37.94and 49.41 J/m (no significant trends). Scanning electron microscopy showed unbroken fibrils distributed on the fracture surface of Specimens 1–3. Additionally, the tensile strain of these specimens was comparatively high. The fracture surfaces of the specimens showed favorable compatibility after undergoing impact tests. The results of regression analysis indicated that the mixing ratio achieved significant correlations with E_a, MI, and Young’s modulus. Thus, regression and multiple regression analysis were performed to create relationship equations.     

中船集团公司标准体系研究

摘要：从2007年开始，中船集团公司组织所属骨干单位启动了中船集团公司标准体系的研究与建立工作。本文主要分析了建立中船集团公司标准体系的总体要求、基本原则、体系范围和标准制定重点领域，同时提出了今后的工作建议。     

对沧州市压力管道元件制造业的思考及建议

介绍了沧州市压力管道元件制造业的规模、水平及在全国的地位,阐述了"无证"和"持证"企业的生产经营情况,指出了当前存在的问题并提出了有关解决办法的建议。     

议建筑施工企业成本管理

从工程全过程的动态管理角度论述了自合同形成、履行至结束过程中施工企业成本管理的方法和应注意的问题,阐述了成本管理应＂合理预测,静态控制,动态管理＂,以期提高企业的成本管理水平,获得更加良好的经济效益。     

钢铁企业循环经济评价指标研究

如何客观地评价钢铁企业循环经济的发展状况是钢铁企业循环经济的一个关键性课题。采用综合评价法，从指标的选取，权重的确定到综合得分，分步阐述，构建一个完整、客观、实用的评价体系。     

建设和谐电力企业探讨

结合思政工作，从企业发展、政工队伍建设、企业文化建设等五个方面，探讨建设和谐企业。     

生态矿区模式构建研究

以科学发展观为指导,以分析矿区发展的时段型特征为突破口,以煤矿为主体在煤矿生产区发展循环经济模式,以土地使用权人为主体在采煤沉陷区实现沉陷土地持续利用,发展生态农业,改变农业的生产方式,以村庄搬迁为契机加快矿区新农村建设,改变农民的生活方式,构建生态矿区模式,实现矿区经济增长方式的转变。     

现场再生施工关键工艺研究

分析了厂拌冷再生和现场冷再生的差别,提出现场的使用状况,并分析了现场冷再生的施工流程,对施工中设备要求、病害处理、试验路段处理、再生机作业、接缝等关键工艺进行了详细的阐述,以使现场冷再生工艺更加完善。