Browsing Conference Papers - Potchefstroom Campus by Title
Now showing items 423-442 of 713
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A methodology to determine best-suited waiting-time periods for turbine start-up under fluctuating resources
(IEEE, 2019)— It is not uncommon for engineering process plants to comprise energy recovery. When power generation takes place under such circumstances, the nature of interlinked processes may result in fluctuating resource availability. ... -
Microgrid energy management through levelized cost of energy metric
(IEEE, 2020)The abundance of solar energy in Africa provides the ideal opportunity to mitigate the concerns on price, reliability and voltage quality of electricity supply to end-users. Rooftop PV and local energy storage solutions ... -
The millisecond pulsar contribution to the rising positron fraction
(Sissa Medialab, 2016)Pair cascades from millisecond pulsars (MSPs) may be a primary source of Galactic electrons and positrons that contribute to the increase in positron flux above 10 GeV as observed by PAMELA and AMS−02. The Fermi Large ... -
Mineralogical observation made during the kinetic dissolution study of chalcopyrite mineral in sulphate media under free pH at room temperature
(EARET, 2018)An attempt to determine the various phenomena at play and leaching mechanism of chalcopyrite dissolution, was conducted on a chalcopyrite concentrate. The study was performed at atmospheric conditions (room temperature) ... -
Modeling and maximum likelihood fitting of gamma-ray and radio light curves of millisecond pulsars detected with Fermi
(Fermi, 2011)Pulsed gamma rays have been detected with the Fermi Large Area Telescope (LAT) from more than 20 millisecond pulsars (:\ISPs), some of which were discovered in radio observations of bright, unassociated LAT sources. We ... -
Modeling and validation of losses due to unbalanced loading of stand-alone generators
(IEEE, 2017)The goal of this paper is to evaluate the possibility of deriving a simple lumped electrical model of the additional losses in stand-alone synchronous generators due to unbalanced loading. An in depth analysis will reveal ... -
Modeling high-energy and very-high-energy γ-rays from the Terzan 5 cluster
(Fermi, 2011)The Fermi Large Area Telescope (LAT) has recently detected a population of globular clusters (GCs) in highenergy (HE) γ-rays. Their spectral properties and energetics are consistent with cumulative emission from a population ... -
Modeling light curves of the phase-aligned gamma-ray millisecond pulsar subclass
(Fermi, 2011)The gamma-ray population of millisecond pulsars (MSPs) detected by the Fermi Large Area Telescope (LAT) has been steadily increasing. A number of the more recent detections, including PSR J0034−0534, PSR J1939+2134 ... -
Modeling of gamma-ray millisecond pulsar light curves revealed by Fermi-LAT
(Thê Giói Publishers, 2009)Fermi Large Area Telescope (LAT) has recently detected 8 gamma-ray millisecond pulsars (MSPs), providing an unprecedented opportunity to probe the magnetospheres of these lowspin-down pulsars. We performed 3D emission ... -
Modeling the pulse profiles of millisecond pulsars in the second LAT catalog of γ-ray pulsars
(AIP, 2012)Significant γ-ray pulsations have been detected from ∼40 millisecond pulsars (MSPs) using 3 years of sky-survey data from the Fermi LAT and radio timing solutions from across the globe. We have fit the radio and γ-ray pulse ... -
Modelling energy-dependent pulsar light curves
(Cambridge Univ Press, 2018)In recent years, surprise discoveries of pulsed emission from the Crab and Vela pulsars above 100 GeV have drawn renewed attention to this largely unexplored region of the energy range. In this paper, we discuss example ... -
Modelling energy-dependent pulsar light curves due to curvature radiation
(Sissa Medialab, 2017)Pulsars emit pulsed emission across the entire electromagnetic spectrum and their light curve phenomenology is strongly dependent on energy. This is also true for the gamma-ray waveband. Continued detections by Fermi Large ... -
Modelling of convection heat transfer in ducts in 1D systems codes
(IHTC, 2018)Convection heat transfer between a solid and a fluid plays a crucial role in amongst others ducts in heat exchangers, the riser tubes in reactor cavity cooling systems and between the graphite and coolant channels in the ... -
Modelling of convection heat transfer in the SNU Riser Heat transfer Experimental Facility (RHEF)
(SAAM, 2018)The Reactor Cavity Cooling System (RCCS) of a High Temperature Gas-cooled Reactor (HGTR) plays an important role in ensuring the integrity of the HTGR during normal operating and accident conditions. The performance of ... -
Modelling the average spectrum expected from a population of gamma-ray globular clusters
(SAIP, 2015)Millisecond pulsars occur abundantly in globular clusters. They are expected to be responsible for several spectral components in the radio through γ-ray waveband (e.g., involving synchrotron and inverse Compton emission), ... -
Modelling the growing population of y-ray millisecond pulsars
(Springer, 2011)TheFermiLarge Area Telescope, in collaboration with several groups from the radio community, have had marvellous success at uncovering new γ-ray millisecond pulsars (MSPs). In fact, MSPs now make up a sizable fraction of ... -
Modelling the light curves of Fermi LAT millisecond pulsars
(South African Institute of Physics, 2014)There are 40 millisecond pulsars (MSPs) in the second pulsar catalogue of the Fermi Large Area Telescope (LAT). This pulsar subpopulation is unique owing to their relatively small magnetospheres. This may result in radio ... -
Modelling the polarisation signatures detected from the first white dwarf pulsar AR Sco.
(Sissa Medialab, 2018)Marsh et al. (2016) detected radio and optical pulsations from the binary system AR Scorpii (AR Sco). This system, with an orbital period of 3.55 h, is composed of a cool, low-mass star and a white dwarf with a spin period ... -
Modelling the stellar soft-photon energy density of globular clusters
(South African Institute of Physics, 2014)Recent observations by e.g. Fermi LAT and H.E.S.S. have revealed globular clusters to be sources of high-energy and very-high-energy gamma rays. It has been suggested that the presence of large numbers of millisecond pulsars ...