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Articles 61 - 90 of 1029
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Thermal Performance And Specific Energy Consumption Of Traditional Tobacco Curing Barns In Tanzania, Seuri S. Kilakoi, Baraka Kichonge, Thomas Kivevele, Mtaki T. Maagi, Jacob B. Lisuma
Thermal Performance And Specific Energy Consumption Of Traditional Tobacco Curing Barns In Tanzania, Seuri S. Kilakoi, Baraka Kichonge, Thomas Kivevele, Mtaki T. Maagi, Jacob B. Lisuma
Tanzania Journal of Science
Traditional tobacco curing barns remain the dominant technology in Tanzania due to their low construction cost and accessibility, particularly in major producing regions such as Tabora. However, their thermal inefficiency results in excessive firewood use and environmental degradation. This study presents a field-based performance evaluation of a traditional flue-curing barn at the Tobacco Research Institute of Tanzania. Environmental parameters and fuel consumption were monitored at 15- minute intervals throughout the yellowing, leaf drying, and stem drying stages. The curing process handled 429 kg of fresh tobacco using 1,016 kg of firewood, equivalent to 16,256 MJ of energy input. The specific …
The Analysis Of Non-Newtonian Blood Flow Through An Atherosclerotic Artery In The Presence Of Body Acceleration, Radiation Effect And Magnetic Field, Johnson N. Katabwa
The Analysis Of Non-Newtonian Blood Flow Through An Atherosclerotic Artery In The Presence Of Body Acceleration, Radiation Effect And Magnetic Field, Johnson N. Katabwa
Tanzania Journal of Science
The unsteady analysis of two-dimensional laminar flow of the non-Newtonian blood through an atherosclerotic artery in the presence of body acceleration, radiation effect and magnetic field has been studied. The blood flow has been assumed to satisfy the Herschel-Bulkley fluid model characteristics. The two- dimensional model equations have been developed from the physical laws of continuity, momentum and energy conservation. These equations are transformed to non-dimensional form and solved numerically using explicit finite difference method under suitable radial coordinate transformation. The study findings show that, the presence of body acceleration increases both velocity and temperature profiles of the blood in …
Valorization Of Palm Oil Wastes Into Oyster Mushrooms (Pleurotus Hk-37) And Biogas Production, Aneth B. David, Anthony M. Mshandete
Valorization Of Palm Oil Wastes Into Oyster Mushrooms (Pleurotus Hk-37) And Biogas Production, Aneth B. David, Anthony M. Mshandete
Tanzania Journal of Science
The study explored the potential of co-production of oyster mushroom Pleurotus HK-37 and biogas from palm oil waste fractions to add value and mitigate environmental impact. Nine different blends of waste fractions were subjected to mushroom production. The highest mushroom yield and biological efficiency were obtained from a blend that combined equal amounts of palm mesocarp fiber (PMF) and empty fruit bunch (EFB) waste fractions supplemented with 1% palm oil mill effluent (POME) and sediments (SD). The spent mushroom substrates (SMS) were used in biogas production, compared to fresh waste blends, biogas volume was higher across all but two treatments. …
Short- Term Effects Of Cypermethrin Pesticide On Nutrient Levels And Microbial Communities In Tropical Soil Of Uganda, Mama N. Simon
Short- Term Effects Of Cypermethrin Pesticide On Nutrient Levels And Microbial Communities In Tropical Soil Of Uganda, Mama N. Simon
Tanzania Journal of Science
Cypermethrin is an insecticide widely used by farmers in Uganda to control pests and diseases. The widespread use leads to biomagnification, affecting humans and the ecosystem. This study examined the short-term effects of cypermethrin on soil macronutrients (N, P, K), meso-nutrients (Ca, Mg), and microbial communities (bacteria, fungi, and actinomycetes) in tropical Ugandan soils. Soil samples treated with cypermethrin and control were collected and analysed using standard methods of flame photometry for potassium (K), atomic absorption spectroscopy for calcium and magnesium, Wet-acid oxidation for nitrogen and phosphorus, and standard plate count techniques for microbial populations. The study used a Randomized …
Food Safety Concerns: A Review On Pathogenic Microbes Associated With Common Edible Insects, Anitha Philbert
Food Safety Concerns: A Review On Pathogenic Microbes Associated With Common Edible Insects, Anitha Philbert
Tanzania Journal of Science
This review explored the pathogenic microbes associated with common edible insects. With rising human populations and fluctuating food supplies, edible insects offer a rich source of protein, vitamins, and minerals and are culturally accepted in many regions. Despite their nutritional benefits, knowledge on microbial hazards associated with edible insects is fragmented. The review focuses on commonly consumed species, including Tenebrio molitor, Zophobas morio, Acheta domesticus, Gryllus bimaculatus, Locusta migratoria, Ruspolia differens, Bombix mori, Bunaea alcinoe, and Oryctes monoceros. A total of 43 pathogenic bacteria and 20 pathogenic fungi linked to these edible insect species were identified. The most frequently reported …
Geochemical Fingerprinting Of Tanzanian Uranium Deposits: The Insights Of Ree Ratios (La/Ce, Nd/Ce, And Sm/Nd) As A Provenance Tool, Lazaro H. Meza, John W. Kondoro, Iyabo T. Usman, Najat K. Mohammed, Titus A. Msagati, Mwingereza John Kumwenda, Mohamed S. Mazunga
Geochemical Fingerprinting Of Tanzanian Uranium Deposits: The Insights Of Ree Ratios (La/Ce, Nd/Ce, And Sm/Nd) As A Provenance Tool, Lazaro H. Meza, John W. Kondoro, Iyabo T. Usman, Najat K. Mohammed, Titus A. Msagati, Mwingereza John Kumwenda, Mohamed S. Mazunga
Tanzania Journal of Science
Accurate uranium provenance determination is crucial for nuclear non-proliferation and environmental protection, yet a forensic-level geochemical framework for Tanzanian uranium deposits has been lacking. This study establishes a robust analytical method using forty-five samples from three major deposits (Mkuju, Manyoni, and Bahi), analyzing elemental compositions, particularly Rare Earth Elements (REEs), via ICP-MS, and validating results using Principal Component Analysis (PCA) and Hierarchical Cluster Analysis (HCA). Despite their proximity, the deposits exhibit distinct geochemical signatures as revealed by key REE ratios and anomalies. Mkuju (mean La/Ce 1.17, Nd/Ce 0.62, Sm/Nd 0.56) is characterized by a positive Europium (Eu) anomaly and heavy …
Optimized Beamforming And Network Slicing For Dense Urban 5g Deployments, Kwame S. Ibwe
Optimized Beamforming And Network Slicing For Dense Urban 5g Deployments, Kwame S. Ibwe
Tanzania Journal of Science
Optimizing beamforming and network slicing is critical for enhancing spectral efficiency, energy efficiency, and resource distribution fairness in dense urban 5G networks. This paper proposes a hybrid genetic algorithm particle swarm optimization (GA-PSO) method to jointly optimize beamforming weights, bandwidth allocation, and power distribution, balancing computational efficiency with near optimal performance. The hybrid approach uses GA for global exploration and PSO for fast convergence, overcoming the limitations of standalone heuristic and exact optimization methods. Simulation experiments in a dense urban 5G network with massive MIMO base stations show that proposed method achieves up to 15% higher spectral efficiency and 18% …
Implementation Of A Carbon-Neutral Pv+Bess System - A Case Study Of Knauf Gypsum Tanzania, Santos Kihwele
Implementation Of A Carbon-Neutral Pv+Bess System - A Case Study Of Knauf Gypsum Tanzania, Santos Kihwele
Tanzania Journal of Science
This study presents a decarbonization pathway for Tanzania’s industrial sector by integrating a 2.966 MWp solar photovoltaic (PV) system with a 2 MW/8 MWh battery energy storage system (BESS) at KNAUF Gypsum Tanzania. A comprehensive techno- economic analysis was conducted using PVSyst simulations software. The simulation integrated site-specific meteorological data, component specifications and the factory’s electricity load profile to model annual generation patterns, system losses and battery charging and discharging cycles. The model accounted for system degradation to ensure realistic long-term performance projections. The PV+BESS solution reduces the energy-related carbon footprint to 64% and cuts annual energy costs by 65%, …
Antioxidant And Anti-Inflammatory Effects Of Blighia Unijugata Baker Aril Protein-Rich Extract, Oludele O. Odekanyin, Ifeoluwa M. Adepoju, Tolulope A. Anjorin, Oluwatobi S. Adekoya
Antioxidant And Anti-Inflammatory Effects Of Blighia Unijugata Baker Aril Protein-Rich Extract, Oludele O. Odekanyin, Ifeoluwa M. Adepoju, Tolulope A. Anjorin, Oluwatobi S. Adekoya
Tanzania Journal of Science
The study investigated the in vitro oxidative-stress-mitigating effect and anti- inflammatory potential of the soluble protein of the arils of Blighia unijugata in order to establish possible use in inflammatory therapy. Air-dried Blighia unijugata aril was pulverized into powder, defatted using petroleum ether, and homogenized in Phosphate Buffer Saline. The homogenate was centrifuged, and the supernatant was subjected to ammonium sulphate fractionation. The precipitate was thoroughly dialyzed, dialysate was freeze-dried, and termed partially purified Blighia unijugata aril protein extract (ppBUAPE). The antioxidant potential of the protein-rich extract was investigated using DPPH, H2O2 scavenging activity, and FRAP. The ability of ppBUAPE …
Enterobacteriaceae Contamination In Locally Packaged Roasted Cashew Kernels From The Coast And Morogoro Regions, Tanzania, Douglas Mushi, Silvia Francis Materu
Enterobacteriaceae Contamination In Locally Packaged Roasted Cashew Kernels From The Coast And Morogoro Regions, Tanzania, Douglas Mushi, Silvia Francis Materu
Tanzania Journal of Science
The increased sales of locally packaged roasted cashew kernels (RCK) in Tanzania reflect growing consumer demand for healthy, convenient snacks. Despite this popularity and frequently reported cases of gastrointestinal illness, the microbial safety of these plastic- bagged products is not well-documented, posing a potential public health concern. To address this, a study was performed to evaluate packaging hygiene, package integrity, and microbial contamination of randomly selected packages of RCK (small: n=99; medium: n=87; large: n=118) from vendors in Coast and Morogoro regions, Tanzania. Package integrity was assessed using a vacuum decay leak tester while microbial contamination on surfaces including RCK, …
Molecular Evidence For Presence Of Manihot Esculenta Associated Virus 1: Cg-Nmb And/Or Cg-Kah Isolates In Coast, Tanzania: A Threat To Cassava Production, Herieth R. Mero
Molecular Evidence For Presence Of Manihot Esculenta Associated Virus 1: Cg-Nmb And/Or Cg-Kah Isolates In Coast, Tanzania: A Threat To Cassava Production, Herieth R. Mero
Tanzania Journal of Science
Genetic diversity of Manihot esculenta associated virus type 1 (MEaV-1) species suspected to cause the most destructive Brown Streak of Cassava (CBSD) in Tanzania, has remained elusive since the year 2020 when MY-6mb-4 virus isolate was first identified in Chambezi, Coast region. In this study, two additional isolates (CG-Nmb and CG-Kah) of the MEaV-1 species were characterized in the same area after screening leaf samples collected from 292 Kiroba, 12 Albert and 22 Kikombe varieties of cassava using a Reverse Transcription Polymerase Chain Reaction (RT- PCR) assay. One half of the leaf samples collected from each of the three varieties …
Mathematical Modeling Of Awareness-Driven Interventions For Gender-Based Violence Control In A Closed Population, Furaha M. Chuma, Edward K. Ngailo, Zubeda S. Mussa
Mathematical Modeling Of Awareness-Driven Interventions For Gender-Based Violence Control In A Closed Population, Furaha M. Chuma, Edward K. Ngailo, Zubeda S. Mussa
Tanzania Journal of Science
Gender-based violence (GBV) remains a critical global health issue with profound social, economic, and psychological implications. Despite concerted efforts to address this challenge, traditional intervention approaches often fall short of effectively mitigating its prevalence. In recent years, there has been growing recognition of the potential impact of awareness-based interventions in addressing various social and health crises. This paper introduces a modeling framework to explore the efficacy of awareness-based interventions in influencing the dynamics of the GBV epidemic within a closed population. A detailed sensitivity analysis, utilizing a normalized sensitivity index method, reveals that the violence transfer rate between perpetrators and …
Modelling The Impact Of Multiple Control Strategies On The Spread Of Phyllody Disease In Sesame, Augustino I. Msigwa, Furaha M. Chuma
Modelling The Impact Of Multiple Control Strategies On The Spread Of Phyllody Disease In Sesame, Augustino I. Msigwa, Furaha M. Chuma
Tanzania Journal of Science
Phyllody disease, caused by phytoplasma and transmitted by insect vectors such as leafhoppers, poses a serious threat to the productivity of sesame (Sesamum indicum) as it has caused substantial yield and oil-quality losses worldwide, with documented seed-yield reductions ranging from 38% to as high as 80% in severe outbreaks, particularly in Africa and India. Understanding phyllody dynamics is therefore critical to safeguard yields and trade. While some modeling efforts exist for sesame phyllody (for example, statistical and prediction-focused approaches), mechanistic transmission models (SEIR) assessing its full impact remain scarce. This study therefore develops and analyses impact of multiple control strategies …
Modeling And Forecasting Wholesale Gasoline Prices In Tanzania Using Arima And Neural Network Autoregressive Models, Thadei D. Sagamiko, Edward K. Ngailo
Modeling And Forecasting Wholesale Gasoline Prices In Tanzania Using Arima And Neural Network Autoregressive Models, Thadei D. Sagamiko, Edward K. Ngailo
Tanzania Journal of Science
Fluctuations in wholesale gasoline prices significantly impact the economy of import-dependent countries like Tanzania, making accurate forecasting essential for policymakers and market participants. This study forecasts monthly wholesale gasoline prices in Dar es Salaam by comparing the Autoregressive Integrated Moving Average (ARIMA) model with a Neural Network Autoregressive (NNAR) model. Using data from January 2015 to December 2024 from the Energy and Water Utilities Regulatory Authority (EWURA), the models were evaluated. The ARIMA(1,1,1) model was identified as the best-fitting linear model, but the NNAR(11,7) model demonstrated superior accuracy. On the holdout test set, the NNAR model achieved a lower Mean …
Aquifer Distribution In Lukobe Ward, Morogoro Municipality, Tanzania: Mapped Resources For Sustainable Water Access, Kelvin K. Kayuni
Aquifer Distribution In Lukobe Ward, Morogoro Municipality, Tanzania: Mapped Resources For Sustainable Water Access, Kelvin K. Kayuni
Tanzania Journal of Science
In response to the ongoing challenges posed by the scarcity of reliable fresh-water sources in Lukobe Ward, Morogoro Municipality, Tanzania, this study applied an integrated approach that combines geospatial and geophysical datasets to identify previously undocumented aquifers. The datasets utilized include an apparent density map generated from high-resolution GGMPlus satellite gravity data, a geological map (Quarter Degree Sheet 183), a water drainage map, and a slope map created from a digital elevation model (DEM). The analysis successfully identified four unconfined, saprolitic aquifers in the study area, designated as aquifers A, B, C, and D. These aquifers span areas of 12.2 …
Synergistic Use Of Sentinel-1 And Sentinel-2 Data For Mapping Of Degradation In Coastal Forests And Miombo Woodlands Of Tanzania, Daria C. Kimaro
Synergistic Use Of Sentinel-1 And Sentinel-2 Data For Mapping Of Degradation In Coastal Forests And Miombo Woodlands Of Tanzania, Daria C. Kimaro
Tanzania Journal of Science
Forest degradation is one of the leading sources of carbon emission globally. In Africa, particularly in Tanzania, forest degradation is driven by selective logging and forest fires. Monitoring degradation over large areas is very challenging due to the lack of accurate and reliable methods. This study assessed degradation in miombo woodlands and coastal forests using a synergy of remotely sensed data acquired from sentinel-1 and sentinel-2 achieved by integrating their complementary strength where sentinel-1 enhanced detection of structural changes and sentinel-2 provided spectral insight into vegetation. The 3I3D, unsupervised algorithm analysing trends for three vegetation indices (3I) in a three-dimensional …
Performance Comparison Of Kriging Models Used For Estimation Of Rainfall Variability In The Northern Coast Of Tanzania, Salma Suleiman, Clement Mromba
Performance Comparison Of Kriging Models Used For Estimation Of Rainfall Variability In The Northern Coast Of Tanzania, Salma Suleiman, Clement Mromba
Tanzania Journal of Science
Accurate rainfall estimation underpins effective disaster preparedness and sustainable socioeconomic planning. The performance of Ordinary Kriging (OK), Universal Kriging (UK), and Simple Kriging (SK) in estimation of rainfall variability were assessed across eight stations in the northern coast of Tanzania for the period from 1960 to 2020. Using ArcGIS 10.3, each method was evaluated and cross-validated using six performance metrics, namely; Mean Error (ME), Mean Square Error (MSE), Root Mean Square Error (RMSE), Root Mean Standardized Square Error (RMSSE), Average Standardized Error (ASE), and the Coefficient of Determination (R²). Performance comparison results indicate OK to have achieved the lowest bias, …
Exploring Bacterial Diversity In Seagrass Meadow Of Thalassia Hemprichii And Syringodium Isoetifolium From Tanzania’S Coast, Lucy D. Mbusi, Thomas J. Lyimo, Sylvester L. Lyantagaye
Exploring Bacterial Diversity In Seagrass Meadow Of Thalassia Hemprichii And Syringodium Isoetifolium From Tanzania’S Coast, Lucy D. Mbusi, Thomas J. Lyimo, Sylvester L. Lyantagaye
Tanzania Journal of Science
Seagrasses are highly productive coastal ecosystems that harbor diverse bacterial communities, including both culturable and unculturable taxa. These bacteria play vital roles in ecological, biogeochemical, and biotechnological processes. In this study, a metagenomic approach using Pacific Biosciences next-generation sequencing was employed to investigate bacterial diversity associated with Thalassia hemprichii and Syringodium isoetifolium collected from the Mjimwema coast, Dar es Salaam, Tanzania. Results revealed that T. hemprichii supported greater bacterial species diversity (117 OTUs) compared to S. isoetifolium (109 OTUs). Among plant compartments, roots harbored the highest diversity, followed by rhizosphere sediment and leaves. The phylum Proteobacteria dominated across all samples …
Simulation Based Model For Canine Distemper Virus In Prey-Predator Dynamics, Mussa A. Stephano
Simulation Based Model For Canine Distemper Virus In Prey-Predator Dynamics, Mussa A. Stephano
Tanzania Journal of Science
This study investigates the dynamic interactions of a prey-predator ecosystem infected with Canine Distemper Virus (CDV), focusing on predation and disease transmission. A deterministic model, coupled with Monte Carlo simulations (MCS), employed to capture both stochastic variability and environmental fluctuations. The findings indicate that classical prey-predator cycles provide the baseline for population dynamics, but the introduction of CDV and environmental noise fundamentally alters system behavior. Initially, populations exhibit oscillations that gradually stabilize into dynamic equilibria. However, the disease persists within both prey and predator populations, suggesting endemicity rather than extinction. Predation plays a dual role in disease dynamics, while it …
Variations In Physicochemical Properties, Microbiological Profiles, And Nutrient Dynamics In The Temi River, Arusha, Tanzania: Sources And Implications, Aldo J. Kitalika
Variations In Physicochemical Properties, Microbiological Profiles, And Nutrient Dynamics In The Temi River, Arusha, Tanzania: Sources And Implications, Aldo J. Kitalika
Tanzania Journal of Science
This study thoroughly investigates the physicochemical properties, microbiological profiles, and nutrient dynamics of the Temi River in Tanzania. The sources and implications of fluctuations in dissolved organic carbon (DOC) and nutrients during the wet and dry seasons are carefully analysed. Water samples were collected from various geographically referenced points along the river, and analyses were performed using the APHA Standard Methods for Water and Wastewater Testing. The results show that most parameters increased downstream in both seasons, with the highest DOC levels reaching 352.11 mg/L in the wet season, followed by a significant decrease to 126.00 mg/L during the dry …
Morphometric And Meristic Analysis Of Labeo Coubie In Esa-Odo Water Reservoir, Esa-Odo, Osun State Nigeria, Olugbemi V. Ekundare, Funmilayo B. Oyekanmi, Mahmud Sanni, Azeez Aransi, Dorcas O. Owolabi
Morphometric And Meristic Analysis Of Labeo Coubie In Esa-Odo Water Reservoir, Esa-Odo, Osun State Nigeria, Olugbemi V. Ekundare, Funmilayo B. Oyekanmi, Mahmud Sanni, Azeez Aransi, Dorcas O. Owolabi
Tanzania Journal of Science
One of the common species of family Cyprinidae found in Nigeria and West Africa is Labeo coubie. They are of commercial importance in West Africa. This study embarked on the assessment of the length- weight relationship, condition factor, morphometrics and meristic characteristics of L. coubie from Esa-Odo water reservoir, Esa-Odo, Osun State Nigeria. A total of 135 (65 males and 70 females) individual L. coubie collected from fishermen were subjected to morphometric and meristic analysis. Results showed 4.90, 5.46 and 5.24 as the b value for male, female and combined sexes respectively, describing positive allometric growth for all the fish …
Antibiofilm Potential Of Zanthoxylum Zanthoxyloides Bark-Extract Against Biofilm-Producing Streptococcus Mutans In Dental Caries, Efunwole Omonike Omolade, Olaitan J. Olubukola, Wahab Abideen A, Oyedara Opemipo Omotayo, Oluwajide O. Odunola
Antibiofilm Potential Of Zanthoxylum Zanthoxyloides Bark-Extract Against Biofilm-Producing Streptococcus Mutans In Dental Caries, Efunwole Omonike Omolade, Olaitan J. Olubukola, Wahab Abideen A, Oyedara Opemipo Omotayo, Oluwajide O. Odunola
Tanzania Journal of Science
Streptococcus mutans is the major cause of dental caries, which is costly to treat. The burden is worse in low- and middle-income countries, due to poor access to oral health services and diets high in free sugars. Conventional antibiofilm agents in oral health often have side effects, prompting the search for safer and affordable alternatives. This study investigates the antibiofilm activity of Zanthoxylum zanthoxyloides bark extract against biofilm-forming S. mutans. Dental plaque and tooth samples were collected from hospitals after ethical approval. S. mutans was identified using standard microbiological methods on Mitis Salivarius agar supplemented with Bacitracin and potassium tellurite. …
Fahp-Topsis Model In Ranking Critical Success Factors Of E-Learning: A Comparative Analysis Of Normalization Methods, Judith R. Pande, David Koloseni, Septimi Kitta
Fahp-Topsis Model In Ranking Critical Success Factors Of E-Learning: A Comparative Analysis Of Normalization Methods, Judith R. Pande, David Koloseni, Septimi Kitta
Tanzania Journal of Science
The teaching and learning process has become effective and explicit due to the progressive development of e-learning. This has significantly transformed the education framework. As a result, evaluating the usefulness of e-learning requires a detailed understanding of the critical success factors that impact the success of e-learning environments. This study ranked these factors using Multi-Criteria Decision-Making techniques. Specifically, the Fuzzy Analytical Hierarchy Process was used to determine the weight of each factor, while the Technique for Order of Preference by Similarity to Ideal Solution was used to rank the factors of e-learning. The study also examined and compared four normalization …
Assessment Of Tumour Control Probability And Equivalent Uniform Dose In Conventional 3d-Crt Vs. Hypo-Fractionated Imrt, Jumaa D. Kisukari, Mwingereza J. Kumwenda, Khamis O. Amour, Ehab M. Attalla, Emmanuel Lugina
Assessment Of Tumour Control Probability And Equivalent Uniform Dose In Conventional 3d-Crt Vs. Hypo-Fractionated Imrt, Jumaa D. Kisukari, Mwingereza J. Kumwenda, Khamis O. Amour, Ehab M. Attalla, Emmanuel Lugina
Tanzania Journal of Science
Hypo-fractionated (HF) radiotherapy offers a promising solution to improve access to cancer treatment in resource-limited settings, such as developing countries, by reducing the number of treatment sessions compared to conventional fractionation (CF). For effective implementation, evaluating Equivalent Uniform Dose (EUD) and Tumour Control Probability (TCP) is essential to ensure treatment efficacy across different radiotherapy techniques. This study compares treatment plans generated using Three-Dimensional Conformal Radiation Therapy with Conventional Fractionation (3D-CRT CF) and Intensity Modulated Radiation Therapy with Hypo-fractionation (IMRT HF) in patients with localized prostate cancer. A total of 50 patients were CT-simulated, and their images were imported into a …
A Comparative Study For Classical Machine Learning Models For Swahili Social Media Sentiment Analysis, Mahadia Tunga, Davis David
A Comparative Study For Classical Machine Learning Models For Swahili Social Media Sentiment Analysis, Mahadia Tunga, Davis David
Tanzania Journal of Science
Despite sentiment analysis being one of the most popular applications in Natural Language Processing (NLP), most studies are skewed towards languages with a rich corpus (language database). Less emphasis has been placed on low-resource languages like Swahili. Swahili is the official language of the African Union and of 4 countries in East Africa, and is spoken by many people on the African continent. This study performed sentiment analysis using 3,000 tweets hosted on the Zindi Africa platform. Data was processed using a term frequency-inverse document frequency vectorization method, and five classical machine learning algorithms (RandomForest, XgBoost, and CatBoost, HistogramGradientBoost, LightGradientBoos) …
Evaluating Weather Research And Forecasting Model In Simulating March-May Rainfall In Tanzania: Implications Of Selecting Parameterization Schemes, Mohamed H. Mohamed, Makungu James Ng'oga
Evaluating Weather Research And Forecasting Model In Simulating March-May Rainfall In Tanzania: Implications Of Selecting Parameterization Schemes, Mohamed H. Mohamed, Makungu James Ng'oga
Tanzania Journal of Science
The current study evaluates the performance of the Weather Research and Forecasting (WRF) model in simulating seasonal rains of March-May (MAM) in Tanzania, based on the implication of selecting parameterization scheme combinations. The model was configured into two domains with horizontal resolutions of 36 km and 12 km and the initial and lateral boundary conditions were provided by the Climate Forecast System Version 2 at 00 UTC. However, only the inner domain of 12 km was used for analysis, which has a fine horizontal resolution that accounts for small scale features such as terrains. Twelve simulations have been performed using …
Mathematical Analysis Of Toxicants And Diseases Impact On A Prey-Predator System With Control Interventions, Nuru Yazidi Juma, Thadei Damas Sagamiko, James Philbert Mpele
Mathematical Analysis Of Toxicants And Diseases Impact On A Prey-Predator System With Control Interventions, Nuru Yazidi Juma, Thadei Damas Sagamiko, James Philbert Mpele
Tanzania Journal of Science
This study developed a generic prey-predator mathematical model incorporating logistic growth for prey and a Holling Type I functional response for predator consumption. Prey-predator interactions form the foundation of ecological balance, but in recent decades these systems have been increasingly threatened by toxicants and infectious diseases. The combined effect of these challenges can lead to severe population declines, biodiversity loss, and ecosystem instability, making their study important for conservation and environmental management. The model includes the effects of diseases and toxicants on prey and toxicants only on predators, and explores optimal control strategies to mitigate these threats. Without considering time …
Design Of High-Performance Synchronous Reluctance Motor For Hybrid Electric Vehicle Application, Fred Loita, Jackson Justo
Design Of High-Performance Synchronous Reluctance Motor For Hybrid Electric Vehicle Application, Fred Loita, Jackson Justo
Tanzania Journal of Science
This paper presents the simulation-based design of a synchronous reluctance motor (SynRM) coupled electromechanical system suitable for the hybrid electric vehicle. The study considers SynRM with a 75kW power rating with the capability to produce up to 125kW maximum power for the electric vehicle. The focus is mainly on rotor and stator design; the angles of the flux-barrier ends are considered to reduce the torque ripple due to the slot harmonics. Reluctance machines are indeed competitive for applications requiring high efficiency at low cost. However, it is a challenging task to find design solutions that ensure structural integrity of the …
Rainwater Harvesting For Domestic Use In Suburb Areas Of Dar Es Salaam, Tanzania: A Case Study Of Wazo Hill, Scholastica S. Ishengoma, Mahir Mohammed Said, Neema O. Msuya
Rainwater Harvesting For Domestic Use In Suburb Areas Of Dar Es Salaam, Tanzania: A Case Study Of Wazo Hill, Scholastica S. Ishengoma, Mahir Mohammed Said, Neema O. Msuya
Tanzania Journal of Science
Despite the increasing reliance of rainwater harvesting in semi-urban areas, there is a lack of comprehensive localized data on the safety of harvested rainwater, particularly in areas such as Wazo Hill where communities predominantly depend on it. This study evaluates the quality of harvested rooftop rainwater intended for human consumption and assesses its compliance with the World health Organization (WHO) and Draft East Africa Standards (DEAS) for drinking water. Rainwater samples were collected from various catchment surfaces and storage systems located in Wazo Hill, Tanzania. A stratified random sampling technique was employed to select the households equipped with rainwater harvesting …
Assessment Of Bacteriological Quality And Physico-Chemical Parameters Of Domestic Water Sources In Relation To Human Health Risk In Kigamboni, Tanzania, Joseph A. Mwakosya
Assessment Of Bacteriological Quality And Physico-Chemical Parameters Of Domestic Water Sources In Relation To Human Health Risk In Kigamboni, Tanzania, Joseph A. Mwakosya
Tanzania Journal of Science
Data on bacteriological quality and physico-chemical parameters is crucial for protection and sustainable utilization of water resources. This study determined bacteriological quality and physico-chemical parameters of well and tap water sourcesin relation to human health risk in Kigamboni, Tanzania. Thirty water samples were collected randomly and analyzed using SPSS software. The mean values for well water samples of pH, electrical conductivity (EC), total dissolved solids (TDS), turbidity, Chloride, Sulphate, Nitrate, Phosphate, and Calcium Carbonate were 7.2, 960.27 mg/L, 528.13 mg/L, 1.52 NTU, 288.00 mg/L, 30.13 mg/L, 0.05 mg/L, 0.08 mg/L, and 160.07 mg/L, respectively. The mean values for tap water …