Research articles (Dept of Physics): Recent submissions
Now showing items 21-40 of 85
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Communication: Remarkable electrophilicity of the oxalic acid monomer: An anion photoelectron spectroscopy and theoretical study
(AIP Publishing LLC., https://aip.scitation.org/journal/jcp, 2014-06-14)Our experimental and computational results demonstrate an unusual electrophilicity of oxalic acid, the simplest dicarboxylic acid. The monomer is characterized by an adiabatic electron affinity and electron vertical ... -
The P wavespeed structure below and around the Kaapvaal craton to depths of 800 km, from traveltimes and waveforms of local and regional earthquakes and mining-induced tremors
(Oxford University Press, https://academic.oup.com/gji, 2002-10-01)An average P-wavespeed model from the surface to depths of 800 km was derived for southern Africa using traveltimes and waveforms from earthquakes recorded at stations of the Kaapvaal and South African National networks. ... -
Identification of sources of aerosol particles in three locations in eastern Botswana
(American Geophysical Union, https://agupubs.onlinelibrary.wiley.com/journal/21562202, 2000-07-27)Airborne particles have been collected using a dichotomous virtual impactor at three different locations in the eastern part of Botswana: Serowe, Selibe‐Phikwe, and Francistown. The particles were separated into two fractions ... -
Mantle structure beneath the incipient Okavango rift zone in southern Africa
(The Geological Society of America, https://pubs.geoscienceworld.org/, 2107-02-01)Numerous investigations of the mature segments of the East African rift system (EARS) have significantly improved our understanding of the structure and processes associated with well-developed continental rifts. In contrast, ... -
Elemental concentrations of aerosols in the city of Gaborone
(Infogain Publication, https://ijeab.com/, 2107-03)This paper presents aerosol studies carried out in Gaborone, the capital city of Botswana. The Gaborone aerosol is varied consisting of elements from Si to Au. Traffic contribution to the aerosol of Botswana is clearly ... -
Geophysical and hydrogeological groundwater prospectivity mapping in the Kraaipan Granite-Greenstone Terrain, Southeast Botswana
(Scientific Research Publishing Inc., https://www.scirp.org/journal/jwarp/, 2017-10)Application of regional geophysical methods for hydrogeological purposes has increased over the last two decades especially in arid and semi-arid areas. A project to map the Kraaipan granite-greenstone terrain in southeast ... -
Measurement of breakdown electric field strength for vegetation and hydrocarbon flames
(Scientific Research Publishing Inc., https://www.scirp.org/, 2018)A significant number of fire-induced power disruptions are observed in several countries every year. The faults are normally phase-to-phase short circuiting or conductor-to-ground discharges at mid-span region of the ... -
Application of Geoelectrical Resistivity Method to the Assessment of Groundwater Pollution: A case Study of Onibu-Eja Active Open Dumpsite, Osogbo, Southwestern Nigeria
(World Academic Publishing, www.academicpub.org/, 2016)Electrical resistivity methods using the dipole – dipole array and Schlumberger Vertical Electrical Sounding (VES) techniques were conducted at the Onibu-Eja active open Dumpsite, Osogbo, Southwestern Nigeria in assessing ... -
Radio Wave Propagation Experiment in Sugarcane Fire Environments
(Scientific Research Publishing Inc., http://www.scirp.org, 2016)Large fires have an effect of suppressing Very or Ultra High Frequency (VHF/UHF) radio wave signals strength which consequently impact negatively on the efficiency of radio communications at the frequency ranges. Mobile ... -
Controlled Texturing of Aluminum Sheet for Solar Energy Applications
(Scientific Research Publishing Inc., http://www.scirp.org/, 2015)Aluminum sheets were polished to reduce ruggedness and then textured in varying acid-ethanol concentration etchant to form pores. The textured surface was characterized structurally by using X-ray diffraction (XRD) which ... -
Absorption of Microwaves in Low Intensity Eucalyptus Litter Fire
(Scientific Research Publishing Inc., http://www.scirp.org, 2015)A fuel bed was constructed where various vegetation species could be used as combustion fuel. The fuel bed was equipped with a thermocouple to measure fire temperature and a two-port automatic network analyser to measure ... -
Gravity and Aeromagnetic Studies of the Filabusi Greenstone Belt, Zimbabwe Craton: Regional and Geotectonic Implications
(Scientific Research Publishing Inc., http://www.scirp.org, 2012)The Filabusi greenstone belt (FGB), Zimbabwe craton, has been geologically remapped relatively recently but its regional tectonic setting and subsurface structure have, until now, remained unresolved. This paper presents ... -
Geoelectric Evaluation of Groundwater Potential and Vulnerability of Overburden Aquifers at Onibu-Eja Active Open Dumpsite, Osogbo, Southwestern Nigeria
(Scientific Research Publishing Inc., http://www.scirp.org/journal/JWARP/, 2016)Electrical resistivity method was used to assess groundwater potential and vulnerability of overburden aquifers at Onibu‐Eja active open dumpsite, Osogbo, Southwestern Nigeria. Eighteen Vertical Electrical Sounding (VES) ... -
Optical Characterization of TiO2-bound (CuFeMnO4) Absorber Paint for Solar Thermal Applications
(Science and Education Publishing, http://www.sciepub.com/journal/AJER, 2016)A composite thin film consisting of TiO2 (binder), uniformly mixed CuFeMnO4 paint (solar absorber) was coated on textured aluminum sheets by dip coating. The film’s elemental analysis was done using energy dispersive x-ray ... -
Observations on the effect of proximity to rhyolitic intrusions on Kübler index
(Mineralogical Society of Poland, http://www.degruyter.com/view/j/mipo, 2010)The Upper Ordovician sedimentary succession of southeast Ireland is riddled with almost synsedimentary igneous intrusions. A study was required to determine any effects of these intrusions on Kübler Index (KI) so that ... -
Structural, optical and fluorescence properties of wet chemically synthesized ZnO:Pd2+ nanocrystals
(SpringerOpen, http://www.inl-journal.com/, 2013)This paper presents the structural, optical and photoluminescence properties of wet chemically synthesized ZnO: Pd2+ colloidal nanocrystals characterised by X-ray diffraction, scanning electron microscopy/energy-dispersive ... -
Simulation of solar radiation conditions in coastal and continental areas by using a new algorithm
(David Publishing Company, http://www.davidpublishing.com/journals_info.asp?jId=1000, 2011)An algorithm developed at the University of Botswana is used to study solar radiation conditions in Namibia, South Africa, Mozambique and Botswana. The synoptic stations chosen for the study differ by meteorological ... -
Piezoelectric energy harvesting devices: an alternative energy source for wireless sensors
(Hindawi Publishing Corporation, http://www.hindawi.com/journals/smr/, 2012)The recent advances in ultralow power device integration, communication electronics, and microelectromechanical systems (MEMS) technology have fuelled the emerging technology of wireless sensor networks (WSNs). The spatial ... -
Finite element modeling of a piezoelectric composite beam and comparative performance study of piezoelectric materials for voltage generation
(International Scholarly Research Network, http://www.hindawi.com/isrn/materials.science/, 2012)A comparative study of the traditional PZT ceramics and new single crystals is critical in selecting the best material and optimization of transducer design for applications such as conversion of ambient vibrations into ... -
Heterogeneous crystallization and composition dependence of optical parameters in Sn–Sb–Bi–Se chalcogenides
(Springer, 2010)Bulk samples of Sn10Sb20-xBixSe70 (0 B x B 8) chalcogenide alloys were prepared by the conventional melt quenching technique. Thin films were prepared on wellcleaned glass substrates by thermal evaporation technique. ...