Browsing Physics by Issue Date
Now showing items 1-20 of 100
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The Anomalous Low State of the X-ray Binary System Hercules X-1
(Doctoral dissertation, University of the Free State, 2008-08)The light curve of Hercules X-1 (Her X-1) shows a peculiar 35-day modulation of the X-ray flux cycling between low and high states. The 35-day modulation is believed to result from the occultation of the neutron star by a ... -
Status of Astronomy at Mbarara University of Science and Technology
(Proceedings of the International Astronomical Union, 2009)In this paper, we describe the role astronomy has played in interesting students towards taking physics as a major subject during their final year in Mbarara University of Science and Technology (MUST). This has resulted ... -
Review of small hydro-power technology
(Renewable and Sustainable Energy Reviews, 2013-05)This paper gives a review of small hydropower technology. Small hydropower (SHP) plant uses impulse or reaction turbines and is mainly ‘run-off-river'. SHP technologies currently used in generating electricity for rural ... -
Climatology of ionospheric scintillations and TEC trend over the Ugandan region
(Advances in Space Research, 2013-12)This study presents results on the investigation of the diurnal, monthly and seasonal variability of Total Electron Content (TEC), phase (rU) and amplitude (S4) scintillation indices over Ugandan (Low latitude) region. ... -
Probing Accretion Disk Winds in AGN
(arXiv preprint arXiv, 2014)The Broad Line Region of Active Galactic Nuclei is characterized by broad Balmer emission lines in their optical spectra. The broad Balmer emission lines are found to be asymmetric, some blue sided and others red sided in ... -
Tracking the Ionospheric Response to the Solar Eclipse of November 03, 2013
(International Journal of Atmospheric Sciences, 2014)The ionospheric dynamics is highly influenced by the solar radiation. During a solar eclipse, the moon occults the solar radiation from reaching the ionosphere, which may drastically affect the variability of the ionosphere. ... -
The Norma cluster (ACO 3627) – III. The Distance and Peculiar Velocity via the Near-Infrared Ks-band Fundamental Plane.
(Monthly Notices of the Royal Astronomical Society, 2014)While Norma (ACO 3627) is the richest cluster in the Great Attractor (GA) region, its role in the local dynamics is poorly understood. The Norma cluster has a mean redshift (zCMB) of 0.0165 and has been proposed as the ... -
Statistical analysis of TEC perturbations over a low latitude region during 2009–2013 ascending solar activity phase
(Advances in Space Research, 2015)Total Electron Content (TEC) perturbations are manifestations of ionospheric irregularities which induce fluctuations in the amplitude and phase of trans-ionospheric radio signals. TEC data derived from Global Positioning ... -
Modelling the probability of ionospheric irregularity occurrence over African low latitude region
(Journal of Atmospheric and Solar-Terrestrial Physics, 2015-03)This study presents models of geomagnetically quiet time probability of occurrence of ionospheric irregularities over the African low latitude region. GNSS-derived ionospheric total electron content data from Mbarara, ... -
Validating the use of scintillation proxies to study ionospheric scintillation over the Ugandan region
(Journal of Atmospheric and Solar-Terrestrial Physics, 2015-03)In this study, we compare the standard scintillation indices (S4 and σΦ) from a SCINDA receiver with scintillation proxies (S4p and sDPR||) derived from two IGSGPS receivers. Amplitude (S4) and phase (σΦ) scintillation ... -
Variations of Crest-to-Trough TEC Ratio of the East African Equatorial Anomaly Region
(International Journal of Astrophysics and Space Science 2016, 2015-03)In this paper, Vertical Total Electron Content (VTEC) data derived from dual-frequency GPS measurements obtained at two ground stations were used to study the variability of the equatorial ionization anomaly (EIA). The ... -
Determination of Natural Radioactivity Levels due to Mine Tailings from Selected Mines in Southwestern Uganda
(Journal of Environment and Earth Science, 2016)The aim of this study was to determine the natural radioactivity levels of primordial radionuclides in soil mine tailings from selected mines in Southwestern Uganda. This was achieved by analyzing thirty six samples of ... -
Determination of Natural Radioactivity Levels due to Mine Tailings from Selected Mines in Southwestern Uganda
(Journal of Environment and Earth Science, 2016)The aim of this study was to determine the natural radioactivity levels of primordial radionuclides in soil mine tailings from selected mines in Southwestern Uganda. This was achieved by analyzing thirty six samples of ... -
The Role of Astronomy in Development: The Case of Uganda
(International Astronomical Union, 2016)Science and technology play a key role in economic development; and Universities have a direct stake in this process. A knowledge-based economy requires scientific and technological expertise that is strongly influenced ... -
Trends of ionospheric irregularities over African low latitude region during quiet geomagnetic conditions
(Journal of Atmospheric and Solar-Terrestrial Physics, 2016-01)The occurrence patterns of ionospheric irregularities during quiet geomagnetic conditions over the African low latitude region were analysed .GNSS-derived Total Electron Content of the ionosphere data during theperiod2001–2012 ... -
Onset of Linear Instability in a Complex Plasma with Cairns Distributed Electrons
(Scientific Research Publishing, 2016-03)A rigorous theoretical investigation of linear dust ion acoustic (DIA) solitary waves in an unmagnetized complex plasma consisting of ion and ion beam fluids, nonthermal electrons that are Cairns distributed and immobile ... -
Modeling of ionospheric irregularities during geomagnetically disturbed conditions over African low-latitude region
(Space Weather, 2016-10)In this study, station-specific models of ionospheric irregularities over low-latitude African region during geomagnetically disturbed days (Dst ≤ −50 nT) have been developed. Global Navigation Satellite Systems (GNSS)-derived ... -
Assessment of scintillation proxy maps for a scintillation study during geomagnetically quiet and disturbed conditions over Uganda
(International Science Program (ISP) from Uppsala University in Sweden, 2016-11-27)A B S T R A C T The objective of this paper is demonstrate the validity and usefulness of scintillation proxies derived from IGS data, through its comparison with data from dedicated scintillation monitors and its application ... -
Assessment of scintillation proxy maps for a scintillation study during geomagnetically quiet and disturbed conditions over Uganda
(Journal of Atmospheric and Solar–Terrestrial Physics, 2016-12)The objective of this paper is demonstrate the validity and usefulness of scintillation proxies derived from IGS data, through its comparison with data from dedicated scintillation monitors and its application to GNSS ... -
Planet population synthesis driven by pebble accretion in cluster environments
(Oxford University Press on behalf of the Royal Astronomical Society, 2016-12)The evolution of protoplanetary discs embedded in stellar clusters depends on the age and the stellar density in which they are embedded. Stellar clusters of young age and high stellar surface density destroy protoplanetary ...
