1,721,155 research outputs found
Book review: Samuel, MA, Dhunpath, R & Amin, N. (eds.). 2016. Disrupting higher education curriculum: undoing cognitive damage.
No full textDr Muaaz Bhamjee, a senior lecturer at the University of Johannesburg\u27s Faculty of Engineering and the Built Environment, reviews Disrupting higher education curriculum: undoing cognitive damage (2016) edited by Michael Anthony Samuel, Rubby Dhunpath and Nyna Amin.
How to cite this book review:
BHAMJEE, Muaaz. Book review: Samuel, MA, Dhunpath, R & Amin, N. (eds.). 2016. Disrupting higher education curriculum: undoing cognitive damage. Rotterdam: Sense Publishers. Scholarship of Teaching and Learning in the South, v. 2, n. 1, p. 145-147, Apr. 2018. Available at: http://sotl-south-journal.net/?journal=sotls&page=article&op=view&path%5B%5D=55
This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0
Modelling of the multiphase interactions in a hydrocyclone using Navier-Stokes and Lattice Boltzmann based computational approaches
Full text linkD.Ing. (Mechanical Engineering)Abstract: Please refer to full text to view abstrac
A computational fluid dynamics and experimental investigation of an airflow window
Full text linkM.Ing.The characterisation of the flow field and thermal performance of supply air windows (airflow windows operating in supply mode) have been a topic of interest for at least two decades. Computational Fluid Dynamics (CFD) as well as other simulation methods have been used to model and characterise the flow field, temperature distributions and thermal performance of the supply air window in recent years. Where experimental validation of the velocity (only outlet velocity) and temperature predictions has been provided the error between experiment and CFD (and other forms of simulation) is in the order of 50 % and 3 ◦C (10-13 %), respectively. Furthermore, a large part of the literature does not have experimental validation of the simulation results. The significant error in many of the studies, that provide experimental val- idation of the velocity field, is attributed to inappropriate turbulence mod- els, unrealistic boundary conditions, neglecting significant three-dimensional effects, solar radiation effects not entirely accounted for, mesh sensitivity studies neglected and material properties of glass and air assumed constant. The aim of this research was to characterise a supply air window in terms of its velocity field, temperature distributions and thermal performance. This was done by mathematically modelling the fluid dynamics and heat trans- fer processes in a supply air window and solving the model in a commer- cial CFD code, namely ANSYS Fluent 12.1. Furthermore, an experimental rig was designed, constructed and used to measure the flow field and tem- peratures with the aim of validating the CFD models. The CFD models incorporated appropriate turbulence models, realistic boundary conditions, three-dimensional effects, solar radiation, temperature dependent material properties and a mesh sensitivity study. The CFD models and experiments were setup for forced and natural flow conditions. Laser Doppler Velocimetry has not been used for velocity field measure- ments in an airflow window to date. The experimental setup made use of Laser Doppler Velocimetry to measure the velocity field and turbulence in- tensities. The Laser Doppler Velocimeter (LDV) probe was positioned using a three axis computer controlled traversing mechanism. Furthermore, flow visualisation experiments were done to qualitatively capture the flow field. The results from the CFD are partially in good agreement with the exper- imental work. Qualitatively the flow field as predicted by CFD is in good agreement with the results from the flow visualisation experiments. Quan- titatively the results from the CFD are in good agreement with the tem- perature measurements, however, there is noticeable error between the LDV readings and the velocities as well as turbulence intensity values predicted by CFD. The error, with regards to velocity and turbulence intensity, may be attributed to the experimental error caused by problems with flow seeding as well as the isotropic turbulence assumption inherent in the turbulence model (SST k − ω) used
A guide to online assessment in large engineering design classrooms
Full text linkAbstract: Student protests in 2015 and 2016 along with the inherent colonial nature of African universities has sparked reflective conversation among university academics in the areas of curriculum development and teaching practice in South Africa. Consequently, the online classroom, though typically perceived as pedagogically unconventional at residential universities in South Africa, is increasingly seen as an innovative way to encourage educator and student engagement with discipline-specific content. In addition, online assessment at residential universities in South Africa is growing in popularity due to its time-saving and efficiency properties. However, there is very little guidance available to educators who wish to conduct online assessments in large classrooms. The purpose of this study is to provide a guide to educators on how to execute online assessment in large classrooms, with specific application to engineering design. The study begins by outlining why an educator may want to consider online assessment for a large classroom. Thereafter, the study explores face-to-face assessment theory vis-à-vis online assessment theory with respect to purpose and efficiency. Following this, the study characterizes the nature of the engineering design classroom used in this study. Subsequently, the study explains the merits and drawbacks of online assessment and provides practical recommendations on how to overcome potential and typical challenges faced in a large engineering design classroom. Findings may prove valuable to other teaching environments and disciplines interested in effective online assessment for large classrooms
The finite element method and its' link to the finite difference method for Poisson's equation
No full textAbstract Poisson’s Equation on a rectangular domain describes conduction heat transfer on a plate. This equation can be solved using the Finite Difference Method (FDM) or the Finite Element Method (FEM). Previous literature has shown that the FEM discretisation equations for the nodal values are integrated averages of the FDM discretisation equations. This paper presents a corrected transformation from the FDM to the FEM, for Poisson’s Equation. For Poisson’s Equation on a rectangular domain the FEM discretisation is obtained by the area integral, in terms of Simpson’s and Midpoint Quadrature, of the FDM discretisation equations. Under the conditions investigated in this paper, the FEM provides the area integral of the partial differential equation (PDE) in terms of Simpson’s and Midpoint Quadrature. The transformation presented in this paper can be used to reduce computational cost and complexity in the FEM, specifically in the construction of the discretisation equations at the nodal point
The finite element method and its' link to the finite difference method for Poisson's equation
No full textAbstract Poisson’s Equation on a rectangular domain describes conduction heat transfer on a plate. This equation can be solved using the Finite Difference Method (FDM) or the Finite Element Method (FEM). Previous literature has shown that the FEM discretisation equations for the nodal values are integrated averages of the FDM discretisation equations. This paper presents a corrected transformation from the FDM to the FEM, for Poisson’s Equation. For Poisson’s Equation on a rectangular domain the FEM discretisation is obtained by the area integral, in terms of Simpson’s and Midpoint Quadrature, of the FDM discretisation equations. Under the conditions investigated in this paper, the FEM provides the area integral of the partial differential equation (PDE) in terms of Simpson’s and Midpoint Quadrature. The transformation presented in this paper can be used to reduce computational cost and complexity in the FEM, specifically in the construction of the discretisation equations at the nodal point
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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