Comment on the paper "Network and Nakamura tridiagonal computational simulation of electrically-conducting biopolymer micro-morphic transport phenomena O. Anwar Bég, J. Zueco, M. Norouzi, M. Davoodi, A. A. Joneidi, Assma F. Elsayed, Computers in Biology and Medicine 44 (2014) 44-56"
The present comment concerns some doubtful results included in the above paper.
Hydromagnetic Flow and Heat Transfer in a Williamson Non-Newtonian Fluid from a Horizontal Circular Cylinder with Newtonian Heating
A theoretical and computational study of the magneto hydrodynamic flow and free convection heat transfer in an electro-conductive polymer on the external surface of a horizontal circular cylinder under radial magnetic field is presented. The Williamson viscoelastic model is employed which is representative of certain industrial polymers. Newtonian heating is incorporated via appropriate boundary conditions as this represents better actual thermal materials processing operations. The non-dimensional, transformed boundary layer equations for momentum and energy are solved with the second order accurate implicit Keller box finite difference method under appropriate boundary conditions. Validation of the numerical solutions is achieved via benchmarking with earlier published results. The influence of Weissenberg number (ratio of the relaxation time of the fluid and time scale of the flow), magnetic body force parameter, stream wise variable and Prandtl number on thermofluid characteristics are studied graphically and via tables. A weak elevation in temperature accompanies increasing Weissenberg number whereas a significant acceleration in the flow is computed near the cylinder surface with increasing Weissenberg number. Nusselt number is reduced with increasing Weissenberg number. Skin friction is increased whereas Nusselt number is reduced with greater stream wise coordinate. The study is relevant to smart coating transport phenomena.
A Construction of Bullying in a Primary School in an Underprivileged Community: An Ecological Case Study
This article is based on a master's dissertation completed through the University of Pretoria. Conversations around behavioural problems in three primary schools in Mamelodi, an underprivileged community in South Africa, explored contextually relevant ideas, in the form of discourse, focusing on the experience of bullying from the perspective of the participants (children identified by the school as engaging in bullying behaviour, school staff, and the children's families). Semi-structured interviews were conducted with the principals (school gatekeepers), and with other participants identified by each other during the interview process. Two figures prominent in the media on the topic at the time of this study were also included to provide discourses on bullying from wider society. An ecological approach within a post-modern social constructionist theoretical framework was used. In this article one ecological case study from one of the three schools was used to explore the aims. Discourse analysis was used in the construction of the various discourses emerging from the conversations. The participants' ideas around bullying are described, focusing on the discourse themes of “community and bullying”, “profile of teachers in the community”, “bad child, good child”, “undefined problems” and “family discord”. The aim of this article is to provide an ecological description of bullying, through discourse, in the context of this case study by exploring the participants' ideas on and experience of bullying in a primary school situated in the township of Mamelodi. Implications for intervention are considered.