Research ArticlesThis collection is made up of research articles produced by both staff and post graduate students of BIUST community.https://repository.biust.ac.bw/handle/123456789/562024-03-29T07:31:51Z2024-03-29T07:31:51ZApplication of attainable region technique to optimize copper slag’s desired size classGabasiane, Tlotlo, SolomonDanha, GwiranaiMamvura, TirivaviriMashifana, TebogoSibanda, Vusumuzihttps://repository.biust.ac.bw/handle/123456789/5592023-11-14T08:41:26Z2022-12-23T00:00:00ZApplication of attainable region technique to optimize copper slag’s desired size class
Gabasiane, Tlotlo, Solomon; Danha, Gwiranai; Mamvura, Tirivaviri; Mashifana, Tebogo; Sibanda, Vusumuzi
Copper slag is a hard material produced from smelting copper-bearing ores. Over the years,
research has prioritized utilizing slag as a secondary source of base metals. This paper focuses on
the grinding/milling of copper slag collected from the BCL Mine in Botswana to obtain a maximum
amount of material in the desired size class with minimal energy consumption. This will then
be followed by an integrated flotation and leaching approach of the desired size class material to
recover copper. Our objectives are to determine the grinding time, ball loading, mill filling and
desired size class for maximum recovery of copper mineral. The attainable region technique is an
equipment-independent optimization tool employed here to determine the optimal specifications of
our experimentally manipulated variables to satisfy the set objective function.
2022-12-23T00:00:00ZUndergraduate students’ motivation towards the use of electronic resources at Federal College of Education (Technical) Gombe, NigeriaLiman, Yakubu, AttahiruRasegojwa, Maleshane, GladysMuhammad, Jika Saiduhttps://repository.biust.ac.bw/handle/123456789/5452023-02-28T10:56:21Z2022-03-09T00:00:00ZUndergraduate students’ motivation towards the use of electronic resources at Federal College of Education (Technical) Gombe, Nigeria
Liman, Yakubu, Attahiru; Rasegojwa, Maleshane, Gladys; Muhammad, Jika Saidu
The purpose of this study is to examine undergraduate students’ motivation towards the use of electronic
resources at Federal College of Education (Technical), Gombe. The objectives of the study include: to determine
the extent of motivation towards the use of e-resources by undergraduate students, to explore the level
perception of the undergraduate students to acquire skills to use e-resources and to examine various challenges
faced by students in the use of e-resources. This study was guided by descriptive research design. The
population of this study consisted of 3725 registered undergraduate students across various Schools. Simple
random sampling in probability sampling techniques was used for this study and the sample size of the study
was 346. The findings of the study revealed that respondents had motivation to use e-resources for research,
intellectual collaboration, build networks among users and improve personal and intellectual thoughts. It was
concluded that though not all the public higher institutions in Gombe State participated in this study, e-resources
in the study area were found to be useful. Students’ motivation towards access to e-resources improves research
and learning among the students. The study recommended that motivation of students towards the use of eresources should be given priority if the college and other higher education intend to achieve its mandate of
promoting research and learning among the students.
2022-03-09T00:00:00ZAnalysis and optimization of auto-correlation based frequency offset estimationNgebani, I.M.Chuma, Joseph MonamatiMasupe, S.https://repository.biust.ac.bw/handle/123456789/5422023-02-14T10:39:10Z2015-09-01T00:00:00ZAnalysis and optimization of auto-correlation based frequency offset estimation
Ngebani, I.M.; Chuma, Joseph Monamati; Masupe, S.
In this letter, a general auto-correlation based frequency offset estimation (FOE) algorithm is analyzed. An approximate closed-form expression for the Mean Square Error (MSE) of the FOE is obtained, and it is proved that, given training symbols of fixed length N, choosing the number of summations in the auto-correlation to be 〈N/3〉 and the correlation distance to be 〈2N/3〉 is optimal in that it minimizes the MSE. Simulation results are provided to validate the analysis and optimization.
2015-09-01T00:00:00ZA surface photovoltage study of surface defects on Co-doped TiO2 thin films deposited by spray pyrolysisWafula, HenryJuma, AlbertSakwa, ThomasMusembi, RobinsonSimiyu, Justushttps://repository.biust.ac.bw/handle/123456789/5162023-02-01T08:40:02Z2016-07-22T00:00:00ZA surface photovoltage study of surface defects on Co-doped TiO2 thin films deposited by spray pyrolysis
Wafula, Henry; Juma, Albert; Sakwa, Thomas; Musembi, Robinson; Simiyu, Justus
Surface photovoltage (SPV) spectroscopy is a powerful tool for studying electronic defects on semiconductor surfaces, at interfaces, and in bulk for a wide range of materials. Undoped and Cobalt-doped TiO 2 (CTO) thin films were deposited on Crystalline Silicon (c-Si) and Flourine doped Tin oxide (SnO 2 :F) substrates by chemical spray pyrolysis at a substrate temperature of 400 °C. The concentration of the Co dopant in the films was determined by Rutherford backscattering spectrometry and ranged between 0 and 4.51 at %. The amplitude of the SPV signals increased proportionately with the amount of Co in the films, which was a result of the enhancement of the slow processes of charge separation and recombination. Photogenerated holes were trapped at the surface, slowing down the time response and relaxation of the samples. The surface states were effectively passivated by a thin In 2 S 3 over-layer sprayed on top of the TiO 2 and CTO films.
2016-07-22T00:00:00Z