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Efficiency analysis of an induction motor with direct torque and flux control at a hot rolling mill
(Energy Research Centre, University of Cape Town, 2015)
This paper presents an efficiency analysis of an
induction motor with direct torque and flux control
at a hot rolling mill in South Africa. Two scenarios
were evaluated: 1) where the induction motor was
controlled at ...
Design of an intelligent controller for a renewable energy efficient bulk storage tank
(2015)
The national electricity supplier in South Africa is experiencing difficulty in providing the
required electricity, due to compliance with environmental regulations and the continuous price
increase of commercial fuels. ...
In-line water heating system for industrial application
(2015)
Due to the increase of electricity prices in South Africa and the World, there exists the need for energy efficient water heating systems. The authors of this paper conducted a literature study on existing water heating ...
Constraining the dark matter density in galaxy clusters
(PoS, 2015)
We illustrate the potential of using stellar velocity dispersion profiles of brightest cluster galaxies
(BCGs), in combination with X-ray and weak-lensing derived cluster mass profiles, to constrain
the matter distribution ...
A search for optical counterparts of the complex Vela X system
(South African Institute of Physics, 2015)
The pulsar wind nebula (PWN) associated with the Vela pulsar is a bright source
in the radio, X-ray and gamma-ray bands, but not in the optical. This source is very near,
lying at a distance of 290 pc, as inferred from ...
Very-high energy emission from pulsars
(SAIP, 2015)
The vast majority of pulsars detected by the Fermi Large Area Telescope (LAT)
display exponentially cutoff spectra with cutoffs falling in a narrow band around a few GeV.
Early spectral modelling predicted spectral cutoffs ...
Implementation of a goodness-of-fit test for finding optimal concurrent radio and γ-ray pulsar light curves
(SAIP, 2015)
Since the launch of the Fermi Large Area Telescope in 2008 the number of known
γ-ray pulsars has increased immensely to over 200, many of which are also visible in the
radio and X-ray bands. Seyffert et al. (2011) ...
In-situ biodiesel production from sunflower seeds using liquefaction
(ETA-Florence Renewable Energies, 2015)
One of the most expensive steps in the bio-diesel value chain is the extraction of oil from the seeds. Simultaneous extraction and transesterification will lower the overall capital costs of the process while enhancing ...
Ultrasonic assisted amaranth stem pretreatment for bio-ethanol production
(ETA-Florence Renewable Energies, 2015)
An investigation was undertaken to determine the effect of ultrasound on enzymatic hydrolysis rate and enhanced bioethanol yields. Compositional analysis of the feedstock reveals that amaranth lignocellulose contains 36.35% ...
Analysis of export and employment opportunities for the South African manufacturing industry
(2015)
The South African government recognises the importance of promoting manufactured exports as a means of ensuring sustainable economic growth and job creation. However, export promotion organisations have limited resources ...