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Islamabad, Pakistan

Amin S.,University of Engineering & Technology, Taxila | Amin M.,CIIT
Reviews on Advanced Materials Science | Year: 2011

The use of polymeric materials has become very popular since last thirty years in many applications. The materials in this category can be broadly divided into two categories i.e. thermo set and thermoplastics. With increasing the world's concern about recyclability and environment protection issues thermoplastics have gained more attraction over the thermo set. Thermoplastic elastomers are novel constructional polymers, which are physically cross linked materials made up of a thermoplastic and an elastomer. TPE have been the interest of numerous researchers world wide since last three decades. Thermoplastic elastomers have a very widespread application domain. This paper reviews the history, physical, chemical, mechanical, electrical characteristics, advantages and uses of these materials along with a particular focus on their use as outdoor electrical insulation. Results of using different kinds of thermoplastic materials as outdoor insulation in different environments of world are also reviewed. This review expected to be useful for researchers working on thermoplastic elastomers in general and particularly for those working in filed of electrical insulation. © 2011 Advanced Study Center Co. Ltd.

Ellahi R.,FBAS | Ariel P.D.,Trinity Western University | Hayat T.,Quaid-i-Azam University | Asghar S.,CIIT
International Journal for Numerical Methods in Fluids | Year: 2010

The heat transfer analysis on the laminar flow of an incompressible third grade fluid through a porous flat channel is examined. The lower plate is assumed to be at a higher temperature than the upper plate. Analytical solution for temperature distribution is obtained for various values of the controlling parameters and discussed. The obtained analytical solution is also compared with the numerical solution. The comparison shows the fact that the accuracy is remarkable. Copyright © 2009 John Wiley & Sons, Ltd.

Hayat T.,Quaid-i-Azam University | Hayat T.,King Abdulaziz University | Naz R.,Quaid-i-Azam University | Asghar S.,CIIT | Alsaedi A.,King Abdulaziz University
International Journal of Numerical Methods for Heat and Fluid Flow | Year: 2014

Purpose - The purpose of this paper is to study the heat and mass transfer with Soret-Dufour effects for the magnetohydrodynamic three-dimensional flow of second grade fluid in the rotating frame of reference. Design/methodology/ approach - Series solution is obtained by homotopy analysis method. Findings - Increase in Soret number, Schmidt number and Dufour number, the heat transfer increases and mass transfer decreases. Effects of Prandtl and Eckert numbers are qualitatively similar as they assist the temperature profile and reduce the concentration of species. Increase in the length of the channel versus height increases the temperature profile but decreases the concentration field. Increase in the second grade fluid parameter causes reduction in both the temperature and concentration fields. The heat flux values at the lower plate are smaller than the values at the upper plate, whereas the situation is opposite in the case of mass transfer. Originality/value - These findings will be useful for the fluid flow in porous channel. Copyright © 2014 Emerald Group Publishing Limited. All rights reserved.

Borrero J.D.,University of Huelva | Yousafzai S.Y.,University of Cardiff | Javed U.,CIIT | Page K.L.,Columbia College at Chicago
Computers in Human Behavior | Year: 2014

An understanding of students' use of social networking sites (SNS) for expressive participation in Internet Social Movements (ISMs) is absent in the literature on the social psychology of student social networking behavior. Using the Unified Theory of Acceptance and Use of Technology (UTAUT) as a theoretical framework and survey data collected from 214 students in Spain, we empirically test the UTAUT theory in this context. Our results confirm that effort expectancy, social influence, and performance expectancy significantly affect students' intentions to use SNS for expressive participation in Internet social movements. We also test the moderating effect of students' sex and Technology Readiness (TR) on these UTAUT relationships. Our results show that the intention to use SNS is strongly influenced by effort expectancy for female students and students with self-reported low-levels of technology readiness. For male students and students with self-reportinghigh-levels of technology readiness, the relationship is strongly influenced by social influence. The implications of our findings for theory and practice are discussed. © 2013 Elsevier Ltd. All rights reserved.

Hina S.,Fatima Jinnah Women University | Hayat T.,Quaid-i-Azam University | Asghar S.,CIIT | Hendi A.A.,King Saud University
International Journal of Heat and Mass Transfer | Year: 2012

In this work the fundamental problem of peristalsis with heat and mass transfer is investigated in the presence of a chemical reaction. An incompressible viscous fluid is considered in a channel with compliant walls. Mathematical modeling is based upon the laws of mass, linear momentum, energy and concentration. Analysis is presented not only for long wavelength and low Reynolds number but also for small Grashof number. The solutions are carried out for the stream function, temperature, concentration field and heat transfer coefficient. The results of various interesting parameters are plotted and discussed. © 2012 Elsevier Ltd. All rights reserved.

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