期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
基于广义动态模糊神经网络的聚乙烯分子量分布软测量 被引量:5
1
作者 安许锋 田洲 钱锋 《华东理工大学学报(自然科学版)》 CAS CSCD 北大核心 2018年第4期529-534,共6页
分子量分布(MWD)是聚合物的重要质量指标,但由于实时检测的困难,MWD的预测成为聚合过程先进控制和优化面临的重要挑战。为解决聚乙烯分子量分布预测的实时性和精度问题,本文结合过程信息和反应机理建立了分子量分布预测的混合模型。首... 分子量分布(MWD)是聚合物的重要质量指标,但由于实时检测的困难,MWD的预测成为聚合过程先进控制和优化面临的重要挑战。为解决聚乙烯分子量分布预测的实时性和精度问题,本文结合过程信息和反应机理建立了分子量分布预测的混合模型。首先通过机理分析,在假设不同催化剂活性位个数的情况下拟合MWD,通过误差分析获得合理的催化剂个数及分布函数参数,同时操作条件与分布函数参数之间的关系通过广义动态模糊神经网络(GDFNN)描述。在GDFNN中,利用K-means初始化其网络结构,训练过程中,充分利用历史数据和新息决定是否增加新规则,减少冗余规则的频繁生成,并通过分级学习机制,前期提高全局学习率,后期提高局部学习率。最后通过实际工业数据的仿真实验证明了该混合模型的有效性。 展开更多
关键词 分子量分布 广义动态模糊神经网络 混合模型 分布函数参数
在线阅读 下载PDF
Effects of homogeneous-heterogeneous reactions in flow of Powell-Eyring fluid 被引量:1
2
作者 T.Hayat M.Imtiaz A.Alsaedi 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第8期3211-3216,共6页
The steady two-dimensional flow of Powell-Eyring fluid is investigated. The flow is caused by a stretching surface with homogeneous-heterogeneous reactions. The governing nonlinear differential equations are reduced t... The steady two-dimensional flow of Powell-Eyring fluid is investigated. The flow is caused by a stretching surface with homogeneous-heterogeneous reactions. The governing nonlinear differential equations are reduced to the ordinary differential equations by similarity transformations. The analytic solutions are presented in series forms by homotopy analysis method(HAM). Convergence of the obtained series solutions is explicitly discussed. The physical significance of different parameters on the velocity and concentration profiles is discussed through graphical illustrations. It is noticed that the boundary layer thickness increases by increasing the Powell-Eyring fluid material parameter(ε) whereas it decreases by increasing the fluid material parameter(δ). Further, the concentration profile increases when Powell-Eyring fluid material parameters increase. The concentration is also an increasing function of Schmidt number and decreasing function of strength of homogeneous reaction. Also mass transfer rate increases for larger rate of heterogeneous reaction. 展开更多
关键词 Powell-Eyring fluid boundary layer flow stretching sheet homogeneous-heterogeneous reactions
在线阅读 下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部