Browsing Research articles (Dept of Physics) by Issue Date
Now showing items 21-40 of 73
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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 ... -
Type II superconducting disk in a spatially inhomogeneous applied magnetic field
(Elsevier Science Ltd. www.elsevier.com/locate/physc, 2003-01)The problem of a type II superconducting disk in a spatially inhomogeneous magnetic field is considered. The aim of the investigations undertaken here is to evaluate the effects of the spatial inhomogeneity of the parallel ... -
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 ... -
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 ... -
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 ... -
The influence of the Tbetta level upon fluorescence and laser properties of aromatic compounds
(Elsevier Science Ltd. www.elsevier.com/locate/saa, 2004)The fluorescence and laser properties of seven specially chosen aromatic compounds are studied at 293 ◦C. The quantum yield of fluorescence, γ, decay times, τf , of the deaerated and non-deaerated solutions are measured. ... -
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 ... -
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. -
Fault-Plane Solutions of the 18 May 2001 earthquake in South Africa near Botswana border
(Botswana Geoscientists Association, 2005-12)Fault-plane solutions of an earthquake can provide information about the type of fault. We report on the calculation of the fault-plane solutions of the earthquake that occurred on the morning of 18 May 2001 and was felt ... -
Magnetic hysteresis properties of interacting and noninteracting micron-sized magnetite produced by electron beam lithography
(AGU and the Geochemical Society. http://www.agu.org/journals/gc/index.shtml, 2006)The magnetic hysteresis properties for well-defined micron-sized magnetite samples produced by electron beam lithography (EBL) are presented. In addition to measuring standard hysteresis parameters, first-order reversal ... -
Photochromism, anomalous multi-banded fluorescence and laser properties of some amino- and tosyl-amino derivative of oxadiazole
(Elsevier Ltd. www.elsevier.com/locate/saa, 2006)The multi-banded fluorescence and laser properties of 11 new amino- and tosylamino derivatives of 2,5-di(phenyl)-1,3,4-oxadiazole and oxadiazole in various solvents at 293 K are reported. All the compounds investigated ... -
Nanoindentation measurements of the mechanical properties of polycrystalline Au and Ag thin films on silicon substrates: Effects of grain size and film thickness
(Elsevier, 2006)This paper presents the results of nanoindentation experimental studies of the contact-induced deformation in Au and Ag thin films. The paper examines the effects of film thickness and substrate deformation restraint on ... -
Photochromism, anomalous multi-banded fluorescence and laser properties of some amino- and tosyl-amino derivatives of oxadiazole
(Elsevier Science Ltd. www.elsevier.com/locate/saa, 2006)The multi-banded fluorescence and laser properties of 11 new amino- and tosylamino derivatives of 2,5-di(phenyl)-1,3,4-oxadiazole and oxadiazole in various solvents at 293K are reported. All the compounds investigated ... -
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 ... -
Understanding Nickel Thin Film crystallization using X-Ray Diffractometry
(Bioline International. http://www.ajol.info/journal_index.php?jid=90, 2007-06)Normal, helical and zigzag deposited Ni films were produced by letting a vapour stream of source material impinge on Corning 1737 glass substrates at oblique incidence while rotating the substrate during deposition. Films ... -
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 ... -
Natural radioactivity in the soil samples of Botswana
(Elsevier, www.elsevier.com/locate/radmeas, 2008)Studies on concentrations of primordial radionuclides in soil samples of Botswana were carried out. Measurements were made by gamma spectrometry employing a 41% relative efficiency HPGe detector. The activity of 226Ra ... -
Gravity anomaly patterns in the south-central Zimbabwe Archaean craton and their geological interpretation
(Elsevier Science Ltd. www.elsevier.com/locate/jafrearsci, 2008)The granite-greenstone terrain of south-central Zimbabwe, encompassing the Belingwe (Mberengwa) greenstone belt and sections of the Great Dyke, provides important constraints on models for the evolution of the Zimbabwe ... -
Phase segregation in Pb:GeSbTe chalcogenide system
(EDP Sciences. http://www.epjap.org/, 2008)Effect of Pb substitution on the amorphous-crystalline transformation temperature, optical band gap and crystalline structure of Ge2Sb2Te5 has been studied. In Pb:GeSbTe chalcogenide films prepared by thermal evaporation, ... -
Electron-LO-phonon scattering near a current-carrying core
(Elsevier Science Ltd. http://www.elsevier.com/wps/find/journaldescription.cws_home/622948/description#description, 2008)A calculation is presented on the scattering rates of electrons via the bulk spectrum of longitudinal optical phonons near a current-carrying core of radius R employing the Frohlich interaction Hamiltonian. The electrons ...