Faculty of Engineering & TechnologyThis collection is made up of research articles produced by both staff and students of BIUST- Faculty of Engineering & Technologyhttps://repository.biust.ac.bw/handle/123456789/602024-03-28T18:26:31Z2024-03-28T18:26:31ZApplication 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.
2022-12-23T00:00:00ZAnalysis 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.
2015-09-01T00:00:00ZHydrogeochemical evaluation of groundwater quality in Dukwi wellfield in BotswanaDiphofu, AbijahYendaw, Jerome A.Suglo, Raymond S.https://repository.biust.ac.bw/handle/123456789/4982022-10-20T09:02:47Z2022-01-01T00:00:00ZHydrogeochemical evaluation of groundwater quality in Dukwi wellfield in Botswana
Diphofu, Abijah; Yendaw, Jerome A.; Suglo, Raymond S.
There has been a decline in groundwater quality in most wellfields in Botswana. This study evaluated the groundwater quality in Dukwi Wellfield for drinking and irrigation purposes and characterised the dominant hydrochemical processes in the wellfield area during winter and summer seasons. The parameters used to assess the water quality for irrigation purposes were percent sodium (%Na) and Sodium Adsorption Ratio (SAR), while for drinking purposes, Water Quality Index (WQI) was assessed. A piper plot was used for the geochemical characterisation of the groundwater while Gibbs plot was used to determine the dominant processes that govern groundwater chemistry. The results show that water from Borehole BH 2985 is excellent for drinking and irrigation as the average %Na, SAR and WQI values were 14.60%, 0.60 and less than 48.37 respectively. The water from Borehole BH 7521 is unsuitable for drinking and irrigation due to the high %Na values (> 90.47%). Also water from Borehole BH 4649 is of poor quality (WQI values > 162.15). The piper plots revealed that 70% of the samples of water in the area has sodium chloride while the Gibbs plots show that the groundwater is highly influenced by rock weathering and moderately by evaporation precipitation.
2022-01-01T00:00:00ZA concealed based approach for secure transmission in advanced metering infrastructureKebotogetse, OtisitsweSamikannu, RaviYahya, Abidhttps://repository.biust.ac.bw/handle/123456789/4972022-10-20T09:00:38Z2022-08-17T00:00:00ZA concealed based approach for secure transmission in advanced metering infrastructure
Kebotogetse, Otisitswe; Samikannu, Ravi; Yahya, Abid
The smart grid has an important subsystem known as the Advanced Metering Infrastructure (AMI), responsible for measuring customer consumption of electricity. The AMI subsystem has smart meters as one of the components and they play a vital role in enabling communication between the utility provider and consumers. Smart meters can report real-time electricity consumption readings of the consumer to the utility. Securing this communication link from attacks remain very important for the secure transmission of readings. Different methods or approaches have been developed, and most works have high computational overheads. This paper proposes a lightweight Concealed Based Security Scheme (CBSS) for secure transmission within the AMI, providing authentication, and reducing the computational overheads and energy consumption during transmission. The CBSS method is compared with the AMI Data Communication Scheme (ADCS) which does not have authentication process. The network is built in the Network Simulator 2 environment, showing the communication between the nodes. Further security is provided using a simple encryption/decryption method of 2 random numbers. The contribution of this paper is the proposed lightweight method for the AMI that authenticates the transfer of data between smart meters and other components of the AMI system. The paper also contains a simulation evaluation for the chosen design parameters of the resemblance of AMI network. The simulations show an improvement of 5% in delivery ratio, 3% throughput and 4% in energy consumed when adding security to the network.
Research Article
2022-08-17T00:00:00Z