3篇
您的检索式：作者名="Arshad Ali Bhatti"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 用人工神经网络混合元启发式优化技术分析不可压缩黏性流体在收敛和发散通道中的流动:一种智能方法显示文摘本文采用人工神经网络(ANN)与进化算法(特别是阿基米德优化算法(AOA)和水循环算法(WCA)相结合的方法)对非线性磁流体动力学(MHD)的Jeffery-Hamel问题,特别是收敛和发散通道中的拉伸/收缩问题进行了数值研究。这种组合技术被称为ANN-AOA-WCA。将基于复杂非线性磁流体动力学Jeffery-Hamel问题的偏微分方程转化为速度和温度的非线性常微分方程系统,我们建立了基于人工神经网络的适应度函数来求解非线性微分问题。随后,采用了一种新的AOA和WCA结合方法(AOAWCA)来优化基于神经网络的适应度函数,并确定了神经网络的最优权值和偏差。为了证明提出混合方法的有效性和多功能性,探索了一系列雷诺数、通道角和可拉伸边界值的MHD模型,从而开发了两种不同的情况。ANN-AOA-WCA的数值结果与参考解(NDSOLVE)非常接近,NDSOLVE与ANNAOA-WCA的绝对误差约为3.35×10^(−8),对可拉伸收敛和发散通道的理解特别关键。此外,为了验证ANN-AOA-WCA技术,我们对150多个独立运行进行了统计分析,以获得适应度值。 | ASLAM Muhammad Naeem RIAZ Arshad SHAUKAT Nadeem ALI Shahzad AKRAM Safia BHATTI M.M. | 2023 | Journal of Central South University2023，30，12： | 0 |
| 2 | On the monetary measures of global liquidity显示文摘This study constructs and examines the dynamics of theoretical and atheoretical measures of global liquidity,using monthly data on the components of broad money over the period 2001 M12-2017 M12 for 39 high income countries.We group the countries into five regional blocks as categorized by the World Bank:East Asia and the Pacific,Europe and Central Asia,Latin America and the Caribbean,Middle East and North Africa,and North America.The atheoretical measures exploited by this study comprise of the simple-sum,GDP-weighted growth rates and PCA based aggregation methods;whereas theoretical measures include the currency equivalent and Divisia index techniques of monetary aggregation.We employ a graphical approach to investigate the trends and dynamics of the aggregates overtime,and a cross-correlation between cyclical components of global real economic activity and the lag of cyclical components of the measures of global liquidity to gauge the strength of their associations.The findings of this study reveal that theoretical measures outperform atheoretical ones in effective delineation of financial and liquidity conditions,and policy stance.Their cyclical components are also strongly associated with those of global real business activity.The currency equivalent measure,besides being a leading indicator of the shift in policy stance,has a sturdy association with global real business activity.Moreover,the theoretical measures,as noted by some empirical studies,contain some information content that the atheoretical lack. | Israr Ahmad Shah Hashmi Arshad Ali Bhatti | 2019 | Financial Innovation2019，5，1： | 0 |
| 3 | Permeability prediction using hydraulic flow units and electrofacies analysis显示文摘It is essential to characterize fluid flow in porous media to have a better understanding of petrophysical properties.Many approaches were developed to determine reservoir permeability among which the integrated analysis of hydraulic flow unit(HFU)and electrofacies(EF)is considered to be useful one.However,the application of HFU and EF analysis has not been totally understood with a limited data to develop correlation for less distance offset wells.In this study,an attempt was made to show the application of integrating HFU and EF for reliable estimation of permeability using core and wireline log data in one of the gas fields in Pakistan.The results obtained indicate that the integrated approach proposed in this study can be used,especially in less distance offset wells when a limited number of data are available for petrophysical characterization. | Amanat Ali Bhatti Atif Ismail Arshad Raza Raoof Gholami Reza Rezaee Ramasamy Nagarajan Eric Saffou | 2020 | Energy Geoscience2020，1，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员