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Browsing Faculty of Science and Education by Author "Biira, Saphina"

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Advances in wildlife and environment management in Uganda

Nyadoi, Priscilla; Mbabazi, Fulgensia Kamugisha; Biira, Saphina; Turyamwesimira, J.; Baluku, R.; Nuwagaba, P.; Mugabi, M.; Kijjambu, C.; Barirega, A. (B P International, 2024)

This publication is a summary of the submissions, proceedings and presentations that were captured during the conservation conference held in February 2023, that featured advances in environment and wildlife conservation ...
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 ...
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 (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, ...
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, ...
Crystal structure changes and weight kinetics of silicon-hexaboride under gamma irradiation dose

Mirzayev, M.N; Jabarov, S.H; Asgerov, E.B; Mehdiyeva, R.N; Thabethe, T.T; Biira, Saphina; Tiep, N.V (Elsesevier B.V, 2018)

The silicide hexaboride (B6Si) was irradiated with 60Co at room temperature to study the structural changes and weight kinetics. The B6Si samples were irradiated using a gamma source with a dose rate (D) of 0.27 Gy/s. At ...
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 ...
Design and fabrication of a chemical vapour deposition system with special reference to ZrC layer growth characteristics

Biira, Saphina; Crouse, P.L.; Bissett, H.; Hlatshwayo, T.T.; van Laar, J.H.; Malherbe, J.B. (2017)

The overall aim of this research project was to design and construct an inhouse, thermal chemical vapour deposition (CVD) reactor system, operating at atmospheric pressure. Radio frequency (RF) induction heating was ...
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 ...
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 ...
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 ...
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, ...
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 ...
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 ...
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 ...
Investigating thermal treatment of W thin film deposited on 6H-SiC in vacuum, hydrogen and argon

Thabethe, Thabsile T.; Biira, Saphina; Njoroge, Eric G.; Malherbe, Johan B.; Hlatshwayo, Thulani T. (2018)

Tungsten thin film was sputter deposited on a single crystalline 6H-SiC substrate and annealed in vacuum, hydrogen and argon atmospheres at a temperature of 800 °C for 1 hour (h). The resulting atomic distribution and ...
Irradiation effects of swift heavy ions on palladium films deposited on 6H-SiC substrate

Thabethea, T.T.; Nstoanea, T.; Biira, Saphina; Njorogea, E.G.; Hlatshwayoa, T.T.; Skuratovd, V.A.; Malherbea, J.B. (Busitema University ; Elsevier, 2019-04)

The irradiation effect of swift heavy ions on palladium (Pd) films deposited on 6H-SiC was investigated. The samples were irradiated by Xe26+ ions with the energy of 167 MeV at fluences of 1× 1013 cm−2 and 3 ×1014 cm−2 at ...
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 ...
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 ...
Overcoming policy and practice fragility and enhancing security of science, technology and innovation educational achievement for females in Uganda.

Okwakol, Mary N.; Ujeyo, Margaret Stella Suubi; Atibuni, Dennis Zami; Biira, Saphina; Waako, Paul (The National Council for Higher Education, 2022)

The Sustainable Development Goals 2030 (SDG 4 and 5) provide for the attainment of quality education for all, including women. Africa Agenda 2063, Uganda Vision 2040, the Third National Development Plan (NDP III) similarly ...
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 ...

Browsing Faculty of Science and Education by Author "Biira, Saphina"

Browsing Faculty of Science and Education by Author "Biira, Saphina"

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