Spheripol-Ⅱ工艺丙烯气相聚合质量机理模型研究

本文针对Spheripol-Ⅱ聚丙烯生产工艺,通过简化丙烯、乙烯气相共聚反应动力学模型,依据物料平衡、能量平衡等反应器动态模型,建立熔融指数等质量指标瞬时性质机理模型,再根据质量指标瞬时性质与累积性能间递推关系建立累积性能机理模型,结合实验室数据,用粒子群优化算法求解预测模型辨识目标函数得到模型参数,最终求得质量机理模型。该质量机理模型成功应用于某石化公司聚丙烯装置气相聚合反应器系统,对采集数据进行对比分析,模型预测值能很好反应化验室数据以及变化趋势,可作为先进控制系统被控变量以实现对产品质量的闭环控制。

The Redesign of the Business Model Based on the Structural Perspective

At present, whether internally or abroad, whether in the theory or business, there is a lack of a unified understanding about the basic concepts of structural system and theoretical category of enterprise business model, and its theoretical analysis framework has not been built up, it is the exploratory phase of the model research in the mass. This study aims to analyze the formation mechanism, action mechanism, and evolution mechanism about the business model from the perspective of structure, and designs the enterprise business model architecture and forms a system, besides, explores approaches and strategies about enterprise carrying out business model innovation, and does beneficial bedding in order to use and improve the theoretical system in the process of the enterprise management practice. The significance of this study is to provide analytical methods and tools for the business model questions in the enterprise management practice. This paper firstly defined the connotation of enterprise business model and summarized the seven characteristics of the corporate business model. On the basis of outlining the enterprise business model design theory, the structural design of the corporate business model is mainly discussed. This paper designed the structure of the business model on modular perspective, proposed four constituent units and nine elements of enterprise business model structure system. Through the design of the enterprise business model structure and analysis of the elements that constitute structure, provide the basis for the transformation of innovative enterprise business model, or both enterprise business models, avoid the lack of elements of the enterprise business model structure and lead to business failure. Finally, the paper concludes with the five core strategies for the implementation of the enterprise business model design.

A mass abrasion model with the melting and cutting mechanisms during high-speed projectile penetration into concrete slabs

In this study,ogive-nose projectile penetration into concrete slabs was tested at initial projectile impact velocities ranging from 1325.0 m/s to 1425.0 m/s.The depth of penetration and mass loss of the projectiles were measured,and the residual projectiles were recovered after the penetration tests.Scanning electron microscopy and metallographic microscopy of the microstructures were performed on various sections and outer surfaces of the projectiles taken from different locations of the residual projectiles,to analyze the intrinsic mechanisms of mass abrasion.The analysis results reveal that,during high-speed projectile penetration,projectile abrasion is caused by multiple mechanisms.Based on the cavity expansion theory,a projectile penetration model was established by considering the two main mass loss mechanisms observed in the microscopic tests.The theoretical predictions of the penetration depth,mass loss rate,and change of projectile head are consistent with the experimental results obtained both in this study and previous research.