Institutional Repository | North-West University | NWU: Recent submissions
Now showing items 18821-18840 of 35815
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Design of a transmission line monitoring solution for an unmanned quadcopter
(2014)Eskom owns thousands of kilometres of transmission lines that need to be inspected in order to plan maintenance. Current methods of inspection are costly and ineffective and could pose safety risks. Systems already developed ... -
Performance comparison of thermal energy storage oils for solar cookers during charging
(ELSEVIER, 2014)Charging experiments to evaluate the thermal performance of three thermal energy storage oils for solar cookers are presented. An experimental setup using an insulated 20 L storage tank is used to perform the experiments. ... -
Study on energy losses in industrial sector caused by low actual efficiency of induction motors
(IEEE, 2014)This paper presents a study on energy losses in the industrial sector caused by low actual efficiency of induction motors (IMs). The main reasons are discussed and an efficiency analysis of a 3-phase induction motor, ... -
Improving energy consumption of an induction motor by design of a power factor correction system and estimation of it's saving on a large scale
(IEEE, 2014)Power factor correction (PFC) is common in commercial and industrial applications. A need to extend its application increased with the dwindling natural resources used for power generation and also exceeding energy demand, ... -
Development of a controller for fuel cell and supercapacitor application
(CATSA (Catalysis Society of South Africa), 2014)The growing demand for energy in the world causes a lot of pressure to the environment and the resources used to supply the energy. To ensure a continuous, more reliable and environmentally friendly energy supply system ... -
Factors associated with prescribing and dispensing of schizophrenia treatment in the private health sector of South Africa
(North-West University (South Africa) , Potchefstroom Campus, 2015)The aim of this study was to determine the prevalence, medicine prescribing patterns and maximum potential savings through generic substitution in direct treatment costs associated with schizophrenia in the private health ... -
Molecular detection of clostridium species in beef obtained from retail shops in North West Province, South Africa
(Science and Educatiion Publishing, 2014)Clostridium species cause diseases in humans that result from consumption of undercooked beef. The objectives of this study were to isolate Clostridium species from beef then the detection of the presence of tpi housekeeping ... -
A modified groundwater flow model using the space time riemann–liouville fractional derivatives approximation
(Hindawi Publishing Corporation, 2014)The notion of uncertainty in groundwater hydrology is of great importance as it is known to result in misleading output when neglected or not properly accounted for. In this paper we examine this effect in groundwater flow ... -
On 2 nonsplit extension groups associated with HS and HS:2
(Turkish JournalPark, 2014)The group HS:2 is the full automorphism group of the Higman--Sims group HS. The groups 24.S6 and 25.S6 are maximal subgroups of HS and HS:2, respectively. The group 24.S6 is of order 11520 and 25.S6 is of order 23040 and ... -
A variational formulation approach to a generalized coulped inhomogenous emden–flowler system
(Taylor & Francis, 2014)We study a generalized coupled inhomogeneous Emden–Fowler system from the Lagrangian formulation standpoint. A special case of this system was considered in the literature, and necessary and sufficient conditions for the ... -
MP2, DFT and DFT–D study of the dimers of diazanaphthalenes: a comparative study of their structures, stabilisation and binding energies
(Taylor & Francis, 2014)Diazanaphthalenes (DAPs) are a broad class of N-heteroaromatic compounds with several technological and biological applications. Some of these applications are attributed to the ability of DAP molecules to form associated ... -
Experimental energy and exergy performance of a solar receiver for a domestic parabolic dish concentrator for teaching purposes
(ELSEVIER, 2014)An experimental setup to investigate the thermal performance of a cylindrical cavity receiver for an SK-14 parabolic dish concentrator is presented in this technical note. The thermal performance is evaluated using energy ... -
New iteration methods for time–frational modified nonlinear kawahara equation
(Hindawi Publishing Corporation, 2014)We put side by side the methodology of two comparatively new analytical techniques to get to the bottom of the system of nonlinear fractional modified Kawahara equation. The technique is described and exemplified with a ... -
Mechanisms of sports injuries among professional footballers: a review
(Sabinet, 2014)Football is an impact collision sport, with injuries occurring in both contact and non-contact situations. Injuries may be caused by complex interactions between internal and external risk factors. The internal factors ... -
Influence of physico-chemistry and mineralogy on the occurrence of geohelminths in geophagic soils from selected communities in the Eastern Cape, South Africa, and their possible implication on human health.
(Taylor & Francis, 2014)Geophagic soils from selected communities in Eastern Cape, South Africa were characterised to determine their properties and geohelminth content. The soils were coarse-textured with cation exchange capacity values ranging ... -
Non–destructive foliar chlorophyll measurement has the potential to predict crude protein concentration and in vitro ruinal organic matter digestibility in Bracharia decumbens herbage
(ELSEVIER, 2014)Quick and accurate estimation of crude protein (CP) concentration and in vitro ruminal organic matter digestibility (IVOMD) of tropical pastures is critical to determine possible nutrient deficits prior to herbage utilization. ... -
Nonlinearly self–adjoint, conservation laws and solutions for forced BBM equation
(Hindawi Publishing Corporation, 2014)We study a forced Benjamin-Bona-Mahony (BBM) equation. We prove that the equation is not weak self-adjoint; however, it is nonlinearly self-adjoint. By using a general theorem on conservation laws due to Nail Ibragimov and ... -
Modelling the formation of liver zones within the scope of fractional order derivative
(Hindawi Publishing Corporation, 2014)We develop and extend earlier results related to mathematical modelling of the liver formation zone by the adoption of noninteger order derivative. The hidden uncertainties in the model are captured and controlled thanks ... -
Model of break–bone fever via beta–derivatives
(Hindawi Publishing Corporation, 2014)Using the new derivative called beta-derivative, we modelled the well-known infectious disease called break-bone fever or the dengue fever. We presented the endemic equilibrium points under certain conditions of the physical ... -
Investigating maternal effects on production traits in Duroc pigs using animal and sire models
(Wiley, 2014)Variance components for production traits were estimated using different models to evaluate maternal effects. Data analysed were records from the South African pig performance testing scheme on 22 224 pigs from 18 herds, ...
