Browsing Research articles (Dept of Physics) by Title
Now showing items 63-82 of 85
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Photon interaction cross sections in the low energy region in Mg and V
(Elsevier Science Ltd. www.elsevier.com/locate/radphyschem, 2004)The interaction of photons with matter has been extensively studied over the past several decades in view of its importance in basic radiation physics research, medical, industrial and other applied fields. Large amounts ... -
Photonics and photochemical stability of aromatic molecules, family related in -structure but different in planarity, rigidity and molecule symmetry
(Elsevier Science Ltd. www.elsevier.com/locate/jphotochem, 2008)Intramolecular processes and fluorescence properties of 32 specially chosen aromatic molecules, different in degrees of planarity and rigidity, but family related in -structure are experimentally and theoretically (using ... -
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 ... -
Plant alkali content and radio wave communication efficiency in high intensity savanna wildfires
(Elsevier Science Ltd. www.elsevier.com/locate/jastp, 2007)The flames of wildfires are weakly ionized gas. The ionization is mainly due to omnipresent alkali and alkaline earth metal species that are emitted from thermally decomposing plant structure into the flame during a ... -
Pn arrivals and lateral variations of Moho geometry beneath the Kaapvaal craton
(Elsevier Science Ltd. www.elsevier.com/locate/lithos, 2003)Pn arrivals from mining-induced earthquakes on the edge of the Witwatersrand basin show that the P wavespeeds in the uppermost mantle are almost constant throughout most of the Kaapvaal craton. The presence of only small ... -
Probing semiconductor quantum well qubits and associated Shannon entropy using semi‑relativistic quantum mechanics
(Springer Nature, https://www.springer.com/, 2023-08-07)Electron states in GaAs, GaN and AlN quantum wells are studied by solving a semi-relativistic wave equation within the effective mass approximation. The quantum states are in turn used to probe the properties of two-level ... -
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 ... -
Radio wave propagation experiment in sugarcane fire environments
(Scientific Research Publishing Inc., https://www.scirp.org/journal/jemaa/, 2016-07-21)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 ... -
Renewable energy education in Botswana: needs, status and proposed training programs
(Elsevier Science Ltd. http://www.sciencedirect.com/science/journal/09601481, 2002-01)Lack of trained manpower for repair and maintenance of solar energy devices in Botswana has resulted in failure of devices, loss of revenue, and dwindling of consumer faith in solar technologies. The government of Botswana ... -
Seismicity Study of Botswana from 1966 to 2012
(Scientific Research Publishing Inc., https://www.scirp.org/journal/ijg/, 2018-12-29)The history of Botswana’s major seismic events has been initiated by two earthquakes that occurred on the 11th of September and 11th of October 1952 with ML Richter magnitudes of 6.1 and 6.7, respectively, in the Okavango ... -
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 ... -
Single-electron states near a current-carrying core
(Elsevier Science Ltd. http://www.elsevier.com/locate/physb, 2004)The energy spectrum of an electron confined near a current-carrying core is obtained as a function of the azimuthal applied magnetic field within the effective-mass approximation. The double degeneracy of the non-zero ... -
South African seismicity, April 1997 to April 1999, and regional variations in the crust and uppermost mantle of the Kaapvaal craton
(Elsevier Science Ltd. www.elsevier.com/locate/lithos, 2003)Events induced by deep gold-mining activity on the edge of the Witwatersrand basin dominate the seismicity of South Africa. The deployment of 54 broad-band seismic stations at 84 separate locations across southern Africa ... -
Status of air pollution in Botswana and significance to air quality and human health
(Pure Earth (formerly Blacksmith Institute), www.pureearth.org, 2017-09-01)Background. Air pollution is an important issue in developed and industrialized countries. The most common sources of air pollution are anthropogenic activities such as construction dust, vehicular emissions and mining. ... -
Stochastic models for sunshine duration and solar irradiation
(Elsevier Science Ltd: http://www.elsevier.com/wps/find/journaldescription.cws_home/969/description#description, 2002)Abstract Harmonic analysis of sunshine duration and solar irradiation measured at Sebele, Botswana is carried out. The data used consists of the monthly averages and the Julian-days averages of sunshine duration and solar ... -
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 ... -
The theory of attenuated total reflection by surface polaritons on corrugated semi-infinite media
(Elsevier Science Ltd. www.elsevier.com/locate/physb, 2002-02)The experimental techniques of attenuated total reflection and grating-coupling were originally employed separately as probes for surface polaritons. However, as far back as the mid-1970s, some value was found in actually ... -
The theory of attenuated total reflection by surface polaritons on one-sided corrugated thin films
(Elsevier Science Ltd. http://www.elsevier.com/wps/find/journaldescription.cws_home/505712/description#description, 2003)The experimental techniques of attenuated total reflection (ATR) and grating coupling were originally employed separately as probes for polaritons. The combined technique of these methods into a single probe is a very ... -
Thermal annealing dependence of some physical propertiesof Bi-substituted Sn–Sb–Se glassy thin films
(EDP Sciences, 2009)Bulk glasses of the Sn10Sb20−xBixSe70 (0 x 8) system were prepared by the conventional melt quenching technique. Thin films were prepared by the thermal evaporation technique on glass substrates. Appearance of some ... -
Transboundary pollution in the Capital City of Botswana
(Infogain Publication, https://ijeab.com/, 2016-09)This paper presents aerosol studies carried out in the capital city of Botswana. The use of backward air mass trajectories has shown that elevated concentrations of fine particles correspond to situations when the air mass ...