Faculty of Science and Education: Recent submissions

Now showing items 61-80 of 92

Effect of the ZrCl4 static vaporiser system and deposition time on growth characteristics of chemical vapour deposited zirconium carbide layers

Biira, Saphina; Hlatshwayo, Thulani T.; Crouse, Philip L.; Bissett, Hertzog; Thabethe, Thabsile T.; Mlambo, Mbuso; Malherbe, Johan B. (Busitema University ; Springer, 2019-04)

ZrC layers were deposited from ZrCl4–Ar–CH4–H2 gas mixture in a home-built vertical wall chemical vapour deposition system within the deposition time range 0.5–2.5 h. The flow behaviour of ZrCl4 from the static vaporiser ...
Formation of Color Centers and Concentration of Defects in Boron Carbide Irradiated at Low Gamma Radiation Doses.

Mirzayev, Matlab Nabi; Meh, Ravan Nadir; Melikova, Sevinj Zellabdin; Jabarov, Sakin Hamid; Thabethe, Thabsile Theodora; Biira, Saphina; Kurbanov, Mirze Abdulla; Tiep, Nguyen Van (Busitema University ; Korean Physical Society, 2019-02-04)

In the present work, boron-carbide (B4C) samples (purity of 99.5% and density of 1.80 g/cm3) were irradiated by using gamma radiation from a 60Co gamma source. Gamma irradiation of the samples was carried out at doses 48.5, ...
Thermodynamics kinetics of boron carbide under gamma irradiation dose.

Mirzayev, Matlab; Demir, Ertugrul; Mammadov, Khagani; Mehdiyeva, Ravan; Jabarov, Sakin; Tugru, A. Beril; Biira, Saphina; Tiep, Nguyen; Thabethe, Thabsile (Busitema University ; World Scientific publishing, 2019-04-11)

In this paper, high purity boron carbide samples were irradiated by 60Co gamma radioisotope source (0.27 Gy/s dose rate) with 50, 100, 150 and 200 irradiation hours at room-temperature. The unirradiated and irradiated boron ...
Quantification and characterization of cocoa pod husks for electricity generation in Uganda.

Kilama, George; Lating, Peter O.; Byaruhanga, Joseph; Biira, Saphina (Busitema University ; BMC, 2019)

Background: Due to limited coverage, the electricity power supply in Uganda is an obstacle to the country’s economic development. Utility firms in Uganda either lack the financial capacity to expand their grids to isolated ...
Oxidation kinetics and thermophysical properties of gamma irradiated silicon hexaboride

Mirzayev, M.N.; Mammadov, Kh.F.; Ismayilova, N.A.; Biira, Saphina; Abdurakhimov, B.; Popov, E. (Busitema University ; Elsevier, 2019)

Silicide hexaboride (SiB6) compound with a purity of 99.5% was irradiated using 60Co gamma radioisotope under the atmospheric pressure with a dose rate (D) of 0.27 Gy/s at the 9.7, 48.6, 97.2, 145.8 and 194.4 kGy doses at ...
Trends and Status of Women in Physics in Uganda.

D’ujanga, Florence M.; Biira, Saphina; Akoba, Rashida (Busitema University ; AIP publishing, 2019)

Most women in Uganda with an advanced degree in physics find employment at a university, teaching and conducting research. Very few take jobs in by industry or at government research laboratories. This paper discusses the ...
Investigating the structural changes induced by SHI on WSiC samples.

Thabethe, T.T.; Ntsoane, T.P.; Biira, Saphina; Njoroge, E.G.; Hlatshwayo, T.T.; Skuratov, V. A.; Malherbe, J.B. (Busitema University ; Elsevier, 2020)

The structural modification of tungsten-SiC samples irradiated with Xe26þ swift heavy ions (SHIs) was investigated. Tungsten (W) thin films were deposited on 6H–SiC using e-beam. After deposition, the W–SiC samples were ...
Thermal performance evaluation of the funnel solar cooker of different funnel lengths implemented in Nagongera, Uganda.

Chepkurui, Jonah; Biira, Saphina (Busitema University ; Tanzania Journal of Science., 2020-01-08)

The aim of this study was to evaluate the thermal performance of a funnel solar cooker with different funnel lengths. Four funnel solar cookers of varying funnel lengths were constructed at Nagongera, in Tororo District, ...
Investigating the thermal stability of the chemical vapour deposited zirconium carbide layers

Biira, Saphina; Thabethe, T.T.; Hlatshwayo, T.T.; Bissett, H.; Ntsoane, T.; Malherbe, J.B. (Busitema University ; Elsevier, 2020)

The effect of thermal treatment on zirconium carbide (ZrC) layers deposited by chemical vapour deposition process was investigated using X-ray diffraction (XRD), Raman spectroscopy, nanoindention and scanning electron ...
Thermophysical behavior of boron nitride and boron trioxide ceramics compounds with high energy electron fluence and swift heavy ion irradiated.

Mirzayev, Matlab N.; Popov, E.; Demir, E.; Abdurakhimov, B.A.; Mirzayeva, D.M.; Sukratov, V.A.; Mutali, A.K.; Tiep, V.N.; Biira, S.; Tashmetov, M. Yu; Olejniczak, K.; Kristavchuk, O. (Busitema University ; Elsevier, 2020-04-08)

We report differential scanning calorimetry (DSC) studies of boron nitride and boron trioxide compounds under different irradiation conditions. In the present work, boron nitride (h-BN) (purity of 99.8% and density of 2.29 ...
A Mathematical model approach for prevention and intervention measures of the COVID–19 pandemic in Uganda.

Mbabazi, Fulgensia Kamugisha; Gavamukulya, Yahaya; Awichi, Richard; Olupot–Olupot, Peter; Rwawire, Samson; Biira, Saphina; Luboobi, Livingstone S. (Busitema University, 2020-05)

The human–infecting corona virus disease (COVID–19) caused by the novel severe acute respiratory syndrome corona virus 2 (SARS–CoV–2) was declared a global pandemic on March 11th, 2020. Current human deaths due to the ...
Concentration levels of radon in mines, industries and dwellings in selected areas of Tororo and Busia districts, Eastern Uganda.

Biira, Saphina; Kisolo, Akisophel W.; D’ujanga, Florence Mutonyi (Busitema University ; Pelagia Research Library., 2014)

Concentration levels and effective exposure dose of radon were determined in mines, industries and dwellings in the Districts of Tororo and Busia, Eastern Uganda in 60 indoor structures between November 2010 and April 2011, ...
CVD growth of ZrC layers at different temperatures.

Alawad, BAB; Biira, Saphina; Bissett, H; Nel, J. T; Hlatshwayo, T. T; Crouse, P. L; Malherbe, J. B (Busitema University ; SciEP, 2016)

Zirconium carbide (ZrC) layers were grown on a graphite substrate by chemical vapour deposition (CVD) at 1250°C, 1300°C and 1350°C. Zirconium tetrachloride (ZrCl4), methane (CH4), hydrogen (H2) and argon (Ar) were used as ...
Female Physicists in Ugandan Universities

D’ujanga, Florence M.; Ssentongo, Grace Spencer; Ayugi, Gertrude; Akoba, Rashida; Biira, Saphina (Busitema University ; AIP publishing, 2015)

For a long time, only one public university in Uganda had a department of physics. Several women graduated from this department, but not many showed much interest in pursuing higher degrees in physics. Currently, there are ...
Effect of temperature and CH4/ZrCl4 molar ratio on ZrC layers deposited in a vertical-wall CVD system

Biira, Saphina; Alawad; Bissett, H; Nel, J. T; Hlatshwayo, T. T; Crouse, P. L; Malherbe, J. B (Busitema University ; SA Institute of Physics, 2016)

The synthesis of ZrC layers was performed in an in-house developed, vertical-wall chemical vapour deposition (CVD) system operating at atmospheric pressure. Zirconium tetrachloride and methane were used as zirconium and ...
Optimisation of the synthesis of ZrC coatings in a radio frequency induction-heating chemical vapour deposition system using response surface methodology.

Biira, Saphina; Crouse, PL; Bissett, H; Alawad, BAB; Hlatshwayo, T. T; Nel, J. T; Malherbe, J. B (Busitema University ; Elsevier, 2017-01-11)

A chemical vapour deposition process using radio frequency induction heating operating at atmospheric pressure was developed for the deposition of ZrC coatings. The precursors utilised in this process were zirconium ...
Influence of the substrate gas-inlet gap on the growth rate, morphology and microstructure of zirconium carbide films by chemical vapour deposition.

Biira, Saphina; Alawad, B.A.B.; Bissett, H.; Nel, J.T.; Ntsoane, T.P.; Hlatshwayo, T.T.; Crouse, P.L.; Malherbe, J.B. (Busitema University ; Elsevier, 2017)

The influence of the gap between the gas inlet and the substrate in an in-house developed thermal chemical vapour deposition (CVD) reactor, on the growth rate, surface morphology, phase composition and microstructure of ...
Analysis of solar radiation in Uganda :

Biira, Saphina; Kilama, George (Busitema University ; JCR, 2014-08-31)

Solar energy is an alternative to fossil fuels for more sustainable and reliable energy options; with a huge potential to meet many times the present world energy demand. Readily available solar radiation data is a key to ...
Analysis of the shift from knowledge based to competency based education among secondary school teachers in Uganda

Olema, D.K.; Nabitula, A.; Manyiraho, D.; Atibuni, D.Z. (Busitema University ; University of Johannesburg., 2021)

This paper analyzes the context of secondary school teachers’ continuous professional development as a key requirement of shifting from knowledge based to competency based education in Uganda. The shift is aimed at equipping ...
Causes of Restocking Delays in Absence of Real Time Inventory Tracking of Airtel Airtime.

Musana, Eddie; Basaza-Ejiri, Annabella H. (Busitema University ; Scientific Research Publishing., 2020-11-17)

The purpose of this research was to ascertain causes of Restocking Delays in Tracking of Airtel Airtime. Journal of Data a Distributor Company of Airtel Airtime (AA) that give justification for ben Analysis and Information ...

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