Browsing Research articles (Dept of Physics) by Title
Now showing items 1-20 of 85
-
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 ... -
Aeromagnetic and Landsat TM structural interpretation for identifying regional groundwater exploration targets, south-central Zimbabwe Craton
(Elsevier Science Ltd. www.elsevier.com/locate/jappgeo, 2008)Aeromagnetic (AM) and Landsat Thematic Mapper (TM) data from the south-central Zimbabwe Craton have been processed for the purpose of regional structural mapping and thereby to develop strategic models for groundwater ... -
Analysis of temperature data over semi-arid Botswana: trends and break points
(Springer Nature Switzerland AG. Part of Springer Nature., https://www.springer.com/journal/703, 2018)Climate change is a global challenge which impacts negatively on sustainable rural livelihoods, public health and economic development, more especially for communities in Southern Africa. Assessment of indices that signify ... -
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 ... -
Bivarate models: relationships between solar irradiation and either sunshine duration or extremum temperatures
(Elsevier Science Ltd. www.elsevier.com/locate/renene, 2003)The Republic of Botswana is one of the sunniest countries in Southern Africa. It has very little cloud cover, insufficient rainfall, very low humidity, and very low wind speed throughout the year for most parts of the ... -
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 ... -
Comprehensive experimental and theoretical investigation of solar radiation conditions in Botswana: A semi-desert region
(Regional Energy Resources Information Center (RERIC) Asian Institute of Technology. http://www.rericjournal.ait.ac.th/index.php/reric/index, 2005-12)Please refer to the attached article for the ABSTRACT. Due to technical problems with some scientific formulae it was not possible to upload the abstract HERE. -
Comprehensive study of solar conditions in Mozambique: the effect of trade winds on solar components
(Elsevier Science Ltd. www.elsevier.com/locate/renene, 2003)A new algorithm to simulate all solar components and optimum slopes, Bopt, based on new models for direct normal beam and diffuse radiation and an analytical model to predict Bopt, developed at the University of Botswana ... -
Contact charging of solution-cast polymers by metals
(Elsevier Science Ltd. www.elsevier.com/locate/elstat, 2005)The charge transfer between metals and some solution-cast polymers has been investigated by employing intermittent soft contact under a controlled condition. The result of our measurements reveals that the measured charge ... -
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 ... -
The current-induced critical field of a type II superconducting cylindrical filament
(Elsevier Science Ltd. www.elsevier.com/locate/physc, 2002-08-15)The azimuthal surface nucleation field of an infinitely long type II superconducting cylindrical filament is calculated from the linearized Ginzburg-Landau equation for the order parameter. A current is thought to be ... -
Determination of magnetite grain-size using the Hopkinson effect - examples from Botswana rocks
(Botswana Geoscientists Association, 2001)The Hopkinson effect is the increase of magnetic susceptibility with temperature from near room temperature to near the Curie point. Although this effect has been known for more than a century, it has not been effectively ... -
Diamagnetic susceptibility and optical properties of a spherical quantum dot: effects of the parabolic and the shifted parabolic potentials
(Springer Science+Business Media, LLC, part of Springer Nature, https://www.springer.com/journal/11082, 2019-06-22)Centred charge donor related diamagnetic susceptibility and optical properties of a spherical GaAs quantum dot are presented. In particular, effects of intrinsic parabolic and shifted parabolic potentials on these quantities ... -
Effect of an inverse parabolic confining electric potential on third harmonic generation in cylindrical quantum wires
(EnPress Publisher, LLC, https://systems.enpress-publisher.com, 2019)A theoretical investigation of the effect of an inverse parabolic potential on third harmonic generation in cylindrical quantum wires is presented. The wave functions are obtained as solutions to Schrödinger equation solved ... -
Effect of annealing on the structural, optical and electrical properties of ITO films by RF sputtering under low vacuum level
(Elsevier Ltd, 2008)Indium tin oxide (ITO) thin films were prepared by RF sputtering of ceramic ITO target in pure argon atmosphere at a high base pressure of 3 10 4mbar without substrate heating and oxygen admittance. The use of pure argon ... -
Effect of annealing on the structural, optical and electrical properties of ITO films by RF sputtering under low vacuum level
(Elsevier Science Ltd. http://www.elsevier.com/locate/mejo, 2008)Indium tin oxide (ITO) thin films were prepared by RF sputtering of ceramic ITO target in pure argon atmosphere at a high base pressure of 3×10−4 mbar without substrate heating and oxygen admittance. The use of pure argon ... -
Effect of composition on optical constants of Pb: GeSbTechalcogenide thin films
(2008)Optical properties of Pb doped ternary Ge-Sb-Te chalcognide films prepared by thermal evaporation have been studied in the visible and near-infrared spectral regions. The straightforward analysis proposed by Swanepoel has ... -
Effective atomic numbers for W/Cu alloy for total photon attenuation
(Elsevier Science Ltd. www.elsevier.com/locate/radphyschem, 2004)The study of interaction of photons with matter finds wide application in areas such as industry, medical radiation dosimetry and radiation shielding. A careful review of these measurements indicates that the studies ... -
The effects of cup-like and hill-like parabolic confining potentials on photoionization cross section of a donor in a spherical quantum dot
(EDP Sciences, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, https://www.springer.com/journal/10051, 2016-08-08)A theoretical investigation of the effects of hill-like and cup-like parabolic confining electric potentials on photoionization cross section (PCS) in a spherical quantum dot is presented. The hill-like and the cup-like ... -
Electron states in a sinusoidally deformed cylindrical quantum wire
(Springer Nature Switzerland AG. Part of Springer Nature, https://link.springer.com/journal/40094, 2017)Electron states in a sinusoidally deformed cylindrical nanowire are probed within the effective mass approximation. The nanowire is immersed in a homogeneous magnetic field applied parallel to the axis of the wire. The ...