Touqeer Saher, Muhammad Asad Saleem Malik, Saif Ullah and Atta Ullah
This study aims to determine the firm and sector efficiency using data envelopment analysis for 121 listed firms, 3 from 2004 to 2016. Based on the efficiency score of 1 and 0, DEA analysis results indicate that 10% firm was highly efficient in the whole sample, 80% are semi-efficient in selected sectors and 10% slightly inefficient. Thus, we can conclude that all firms are not equally efficient. Also, the study used a Logit/ Probit Regression model, and results indicate that the brand value and type of sector has a positive impact on firm efficiency. The study concludes that Brand value increases firm efficiency, so managers should put more focus on building firm brand value.
An investigation is performed for an alyzing the effect of entropy generation on the steady, laminar, axisymmetric flow of an incompressible Powell-Eyring fluid. The flow is considered in the presence of vertically applied magnetic field between radially stretching rotating disks. The Energy and concentration equation is taking into account to investigate the heat dissipation, Soret, Dufour and Joule heating effects. To describe the considered flow non-dimensionalized equations, an exact similarity function is used to reduce a set of the partial differential equation into a system of non-linear coupled ordinary differential equation with the associated boundary conditions. Using homotopy analysis method (HAM), an analytic solution for velocity, temperature and concentration profiles are obtained over the entire range of the imperative parameters. The velocity components, concentration and temperature field are used to determine the entropy generation. Plots illustrate important results on the effect of physical flow parameters. Results obtained by means of HAM are then compared with the results obtained by using optimized homotopy analysis method (OHAM). They are in very good agreement.