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Articles 31 - 60 of 1029
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Natural Radioactivity And Radiological Hazards In Sediments From The Lindi Coast, Indian Ocean, Tanzania, Viator Mujuni, Innocent J. Lugendo
Natural Radioactivity And Radiological Hazards In Sediments From The Lindi Coast, Indian Ocean, Tanzania, Viator Mujuni, Innocent J. Lugendo
Tanzania Journal of Science
The Lindi coast of the Indian Ocean, located in southeastern Tanzania, supports rich biodiversity and has recently experienced rapid growth in socio-economic activities such as fishing, mining, and oil and gas exploration. These activities may enhance levels of natural radioactivity in coastal sediments, potentially increasing radiation exposure to local populations. Therefore, monitoring radioactivity levels and estimating associated radiation doses in this region is important. In this study, thirty-six sediment samples were collected from twelve locations along the Lindi coast and analysed for naturally occurring radionuclides using high-purity germanium (HPGe) gamma-ray spectrometry. The activity concentrations of 226Ra, 232Th, and …
Concealed History Of Microplastic Pollution In The Msimbazi Estuary, Dar Es Salaam, Tanzania, Dativa J. Shilla
Concealed History Of Microplastic Pollution In The Msimbazi Estuary, Dar Es Salaam, Tanzania, Dativa J. Shilla
Tanzania Journal of Science
This study reconstructed the historical deposition of microplastics in sediments of the Msimbazi Estuary, Tanzania, using a radiometrically dated sediment core. Sediment chronology established using ²¹⁰Pb and the Constant Initial Concentration (CIC) model provided an approximately 83-year depositional record. The ²¹⁰Pb age model suggested marked temporal variability in sedimentation rates, with peaks around 1961, 1998, 2013, and 2015, potentially reflecting hydrological extremes and catchment disturbances. Anthropogenic microparticles were detected throughout most of the sediment core, with concentrations ranging from below detection limit (BDL) to 34 items kg⁻¹ dry weight (mean 8.5 ± 3.2 items kg⁻¹), and their abundance generally increased …
Epidemiology And Ultrasonographic Observations Of Urogenital Schistosomiasis Related Urinary Tract Morbidity In Itilima District, Simiyu Region, Tanzania, Coletha Yohana, Bruno A. Nyundo, Jared S. Bakuza, Peter F. Rambau, Safari M. Kinung’Hi
Epidemiology And Ultrasonographic Observations Of Urogenital Schistosomiasis Related Urinary Tract Morbidity In Itilima District, Simiyu Region, Tanzania, Coletha Yohana, Bruno A. Nyundo, Jared S. Bakuza, Peter F. Rambau, Safari M. Kinung’Hi
Tanzania Journal of Science
Chronic infection of urogenital schistosomiasis in humans is a major cause of urinary tract morbidity in endemic areas. However, information on the prevalence of schistosomiasisrelated urinary tract morbidity is lacking in most endemic countries including Tanzania. This study was conducted to determine the prevalence of schistosomiasis-related urinary tract morbidity in schoolchildren and adults in Itilima District. Urine samples from 682 residents were examined for Schistosoma haematobium infection using urine filtration technique. Urinary tract morbidity was examined by ultrasound. The prevalence of S. haematobium infection was 16.4% (112/682) and varied significantly between villages (range 3.2% to 29.5%, χ2 = 48.467, p < 0.001). There was no significant variation of S. haematobium infection between male and female (8.3 % vs 8.1%, χ2 = 0.679, p = 0.410). Majority (93.8%) had light infections (
Trophic Transfer Of Fluorescent Polyethylene Microplastics In A Simplified Artemia–Oreochromis Aquatic Food Chain, Dativa J. Shilla
Trophic Transfer Of Fluorescent Polyethylene Microplastics In A Simplified Artemia–Oreochromis Aquatic Food Chain, Dativa J. Shilla
Tanzania Journal of Science
Microplastics (MPs) are pervasive contaminants in aquatic ecosystems, yet experimental evidence of their trophic transfer within tropical African food webs remains scarce. This study provides experimental evidence of indirect trophic transfer of microplastics from Artemia salina to Oreochromis urolepis, a cichlid species of ecological and economic importance in African inland and coastal waters. A simplified two-level food chain was established by exposing A. salina nauplii to fluorescent polyethylene microplastics (10–20 µm; 1, 10, and 100 mg L⁻¹) and subsequently feeding them to juvenile O. urolepis under controlled laboratory conditions. These concentrations were selected to represent a range of exposure levels …
Load Profile Analysis And Forecasting For Rural Mini Grids In Uganda, Prossy Mutesi, Santos L. Kihwele, Emmanuel S. Matee
Load Profile Analysis And Forecasting For Rural Mini Grids In Uganda, Prossy Mutesi, Santos L. Kihwele, Emmanuel S. Matee
Tanzania Journal of Science
Accurate load forecasting is essential for the reliable and cost-effective operation of rural mini grids, where constrained generation capacity and high penetration of renewable energy resources require well-informed operational decisions. This study examines electricity demand characteristics and forecasting performance for the Buzaami and Ssenyondo mini grids in Uganda, with particular focus on diurnal load profiles, peak demand behavior, and seasonal variability. 2022 operational data show extended peak demand from early morning to late evening, driven by socio-economic activities that strain resource scheduling and reliability management. To address these challenges, the study evaluates and compares Long Short-Term Memory (LSTM) networks, fuzzy …
A System For The Prediction Of Election Results Using Vader And Hybridized Machine Learning Model, Abraham E. Evwiekpaefe, Khadijah Kabir, Georgina N. Obunadike
A System For The Prediction Of Election Results Using Vader And Hybridized Machine Learning Model, Abraham E. Evwiekpaefe, Khadijah Kabir, Georgina N. Obunadike
Tanzania Journal of Science
Integrating different classifiers along with sentiment lexicons like Vader, can enhance the performance of sentiment analysis systems. However, such a hybrid model remains underexplored, particularly in the context of regional elections in developing countries like Nigeria. The aim of this research is to develop a hybrid model that combines three machine learning classifiers and Vader lexicon to possibly achieve a higher accuracy. A case study of the 2023 governorship election in Kogi, Bayelsa and Imo State, Nigeria was examined. Twitter API library was utilized to extracted public and personal tweets using hashtags and keywords related to the target data from …
Optimization Of Bio-Briquettes Production From Cassava Stems Co-Blended With Sisal Bole Bagasse Using Response Surface Methodology, Agnes Nshoma Msobi, Neema O. Msuya, Kando Khalifa Janga
Optimization Of Bio-Briquettes Production From Cassava Stems Co-Blended With Sisal Bole Bagasse Using Response Surface Methodology, Agnes Nshoma Msobi, Neema O. Msuya, Kando Khalifa Janga
Tanzania Journal of Science
This research aimed at producing bio-briquettes from cassava stems and sisal bole bagasse as an alternative source of cooking energy. A Response Surface Methodology (RSM) with Face - Centered Central Composite Design (FCCCD) featured a multi-objective optimization of the effect of the production parameters, focusing on maximizing char yield and Higher Heating Value (HHV) of the produced briquette while minimizing carbonization temperature and residence time. The findings showed that bio-briquettes produced at the lowest temperature (250 ℃) and residence time (30 min) and the blending ratio of 75% by 25% had the highest char yield of 76.92% and HHV of …
The Helminthic Status Of Selected Tanzanian Subterranean Rodents, The Root-Rats (Spalacidae: Tachyoryctes Splendens) And Emini Silvery Mole-Rats (Bathyergidae: Heliophobius Argenteocinereus Emini), Jestina V. Katandukila
The Helminthic Status Of Selected Tanzanian Subterranean Rodents, The Root-Rats (Spalacidae: Tachyoryctes Splendens) And Emini Silvery Mole-Rats (Bathyergidae: Heliophobius Argenteocinereus Emini), Jestina V. Katandukila
Tanzania Journal of Science
Root-rats (Tachyoryctes splendens) and emini silvery mole-rats (Heliophobius argenteocinereus emini) are common subterranean rodents that are essential component of the ecosystem. They serve as prey for small to medium-sized carnivores and birds of prey but their role as hosts to parasites is limited. The present study, explored the Gastrointestinal Tract (GIT) contents of 40 rodents (20 T. splendens and 20 H. a. emini, respectively) to acquire information on parasites diversity of these mammals. The GIT contents from subterranean rodents in a sex ratio of 1:1 were examined under a compound microscope to isolate helminths. The isolated helminths belonged to the …
Modelling And Analysis Of 50 Mwp Solar Pv Integration Into Tanzania’S Transmission Network: A Case Study Of Tagamenda Substation, Iringa Region, Santos Kihwele
Modelling And Analysis Of 50 Mwp Solar Pv Integration Into Tanzania’S Transmission Network: A Case Study Of Tagamenda Substation, Iringa Region, Santos Kihwele
Tanzania Journal of Science
While increasing the share of renewable energy in the grid, grid integration studies for the utility solar photovoltaic (PV) plants are vital, given their intermittency and the fact that Tanzania has never had one connected to the grid. This paper presents a 50 MWp grid integration study, including a technical analysis conducted using PSS®E software. The study investigates the grid behaviour during the integration of the 50 MWp solar plant, considering the most suitable technical and economic solutions. The study analysed the load flow under normal conditions, contingency analysis (N-1), short- circuit analysis, and voltage stability assessment. The results show …
Extraction Of High-Quality Cashew Nutshell Liquid Using Carbon Dioxide-Expanded Hexane, Frank N. Jacob, Neema Msuya, Joseph Y.N Philip, Kando Khalifa Janga
Extraction Of High-Quality Cashew Nutshell Liquid Using Carbon Dioxide-Expanded Hexane, Frank N. Jacob, Neema Msuya, Joseph Y.N Philip, Kando Khalifa Janga
Tanzania Journal of Science
Cashew nutshell liquid (CNSL) is a by–product from cashew processing industries containing four naturally occurring phenolic compounds. This study investigated an extraction approach using CO2–expanded hexane. The central composite design (CCD) was employed in experimental design to investigate the effects and interaction of CO 2 mole fractions and extraction temperature on the CNSL yield and quality (Colour) from Steamed CNSL. The dissolution power of the CO2–expanded hexane was assessed by determining the solubility of CNSL during the initial stages of extraction at different extraction conditions. Findings indicated that higher CO2 mole fractions reduced CNSL solubility, while higher temperatures enhanced it. …
Synthesis, Structural Elucidation, In Vitro Antibacterial Activity Of Mononuclear Ag(I) Complex Derived From (E)-N-(4-Fluorophenyl)-1-(Pyridin-2-Yl) Methanimine And Triphenylphosphine Ancillary Ligand., Olufemi Stephen Odulaja, Saliu Alao Amolegbe, Muritala Adeniyi Olusola
Synthesis, Structural Elucidation, In Vitro Antibacterial Activity Of Mononuclear Ag(I) Complex Derived From (E)-N-(4-Fluorophenyl)-1-(Pyridin-2-Yl) Methanimine And Triphenylphosphine Ancillary Ligand., Olufemi Stephen Odulaja, Saliu Alao Amolegbe, Muritala Adeniyi Olusola
Tanzania Journal of Science
Chemo-therapeutic application of metal complexes to remediation and subjugation of emerging infectious diseases with a view to improving potency and efficacy of a variety of drugs is gaining more momentum, especially in the 21st century. This research work designed a new biologically active complex [AgL(PPh3)2]NO3,C, obtained from the reaction of Ag(I) nitrate with bidentate pyridinyl Schiff base ligand (E)-N-(4-fluorophenyl)-1-(pyridin-2-yl) methanimine L, with triphenylphosphine (PPh3) as co-ligand. Characterisation was done by FT-IR, UV-Vis, NMR, (TGA/DTA), X-ray crystallography, and elemental analysis. The combined effects of pyridinyl Schiff base ligand and PPh3 on the antibacterial activities against Staphylococcus aureus, Escherichia coli, Klebsiella pneumonia, …
Optimization Of Pediatric Multidetector Ct Imaging Parameters Using A Machine Learning–Based Monte Carlo Simulation Model, Ali O. Masoud, Adithya Rajnaryanan, Khamis O. Amour, Ahmed M. Jusabani, Justin E Ngaile, Manoj Kumar, Mwingereza John Kumwenda Dr
Optimization Of Pediatric Multidetector Ct Imaging Parameters Using A Machine Learning–Based Monte Carlo Simulation Model, Ali O. Masoud, Adithya Rajnaryanan, Khamis O. Amour, Ahmed M. Jusabani, Justin E Ngaile, Manoj Kumar, Mwingereza John Kumwenda Dr
Tanzania Journal of Science
This study utilized Monte Carlo (MC) simulations to optimize radiation doses in pediatric multidetector computed tomography (MDCT) head scans by analyzing key parameters like tube current (mA), tube voltage (kV), pitch, and slice thickness. The findings indicate that reducing tube current significantly lowers the Computed Tomography Dose Index (CTDIvol) and Dose Length Product (DLP), effectively minimizing patient radiation exposure. Higher pitch values (0.7–0.9) further reduced radiation by decreasing beam overlap, while using a thinner slice thickness (0.6 mm) improved dose efficiency. A comparison highlighted the effectiveness of optimization: simulated parameters kVp 100, mAs 81, pitch 0.98 yielded a CTDIvol of …
Design Of Virtual Impedance Controller For Parallel-Connected Converters In A Microgrid, Manyanda Makoye, Francis Mwasilu, Peter M. Makolo, Jackson Justo
Design Of Virtual Impedance Controller For Parallel-Connected Converters In A Microgrid, Manyanda Makoye, Francis Mwasilu, Peter M. Makolo, Jackson Justo
Tanzania Journal of Science
This paper addresses the significant challenge of inaccurate power sharing among Distributed Generators (DGs) in islanded microgrids, which is primarily caused by mismatched feeder and line impedances. Conventional decentralized control solutions often fail to ensure accurate power sharing, especially when line impedances are resistive. To overcome this, the paper proposes a robust, coordinated Virtual Impedance Control (VIC) strategy for DGs. This method implements fixed virtual resistance and virtual inductance to standardize the output impedance characteristics of parallel-connected inverters, thereby minimizing impedance discrepancies and enhancing system stability through increased damping. The theoretical analysis and design of the VIC were validated through …
Elemental And Mineralogical Characterization Of Permo-Carboniferous Coal In The Ngaka Coalfield, Southwest Tanzania: Implications For Coal Quality Variation, John W. Gama, Justina J. Saroni, Remigius L. Gama
Elemental And Mineralogical Characterization Of Permo-Carboniferous Coal In The Ngaka Coalfield, Southwest Tanzania: Implications For Coal Quality Variation, John W. Gama, Justina J. Saroni, Remigius L. Gama
Tanzania Journal of Science
Coal from heterolithic seams exhibits distinct chemical characteristics due to interbedded non-coal beds, which influence its quality and usability. Despite extensive research in these settings, the elemental and mineralogical characteristics of the heterolithic sequences of the Mchuchuma Formation (K2) in the Ngaka Coalfield remain poorly documented. This study provides the first detailed assessment of K2 seams across five active mine sites. Eleven representative samples were analyzed using proximate, elemental, and mineralogical techniques, supported by Pearson correlation, binary analysis, and Principal Component Analysis. Proximate analysis revealed that ash content varies across mine sites, with values ranging from 9.17 to 25.03%, volatile …
Analysis Of The Effects Of Magnetic Field, Heat Transfer, And Thermal Radiation On Blood Flow Through Bifurcated Artery To Enhance Tumor Treatments, Abdullahi Isah, Dauda Gulibur Yakubu, Ali Musa
Analysis Of The Effects Of Magnetic Field, Heat Transfer, And Thermal Radiation On Blood Flow Through Bifurcated Artery To Enhance Tumor Treatments, Abdullahi Isah, Dauda Gulibur Yakubu, Ali Musa
Tanzania Journal of Science
The work presents the effects of some pertinent parameters on blood flow through bifurcated artery to enhance tumor treatments. Combining appropriately the basic equations, together with the fractionalized Maxwell fluid model allow us to determine the velocity, temperature and concentration of blood flow through bifurcated artery. The study adopted the Atangana-Baleanu fractional time derivative on fluid model to describe the non-Newtonian behavior of blood flow. The numerical simulations were performed using the combined Laplace transform and the method of undetermined coefficients and the results obtained with the aid of Mathcad software were simulated and presented graphically. From the graphical results, …
Asymmetrical S-Curve For Residual Load Sways Suppression For Double-Pendulum Rotary Crane Using Bayesian Optimization, Haryson Johanes Nyobuya
Asymmetrical S-Curve For Residual Load Sways Suppression For Double-Pendulum Rotary Crane Using Bayesian Optimization, Haryson Johanes Nyobuya
Tanzania Journal of Science
In rotary crane operations, one of the main difficulties lies in suppressing the load sway during its movement. This can be achieved using only horizontal boom motion, offering a solution that is energy-saving, simple, and safe. However, this approach renders the system under actuated, making the suppression objective more difficult to achieve. In this study, a double-pendulum model is adopted to capture the coupled dynamics of the suspended load and hook, which shows a realistic basis for sway suppression. An asymmetric S-curve velocity trajectory is proposed to shape the horizontal boom motion, effectively minimizing residual vibrations without requiring direct sway …
Quantitative Analysis Of Cholera Dynamics And The Impact Of Integrated Control Measures., Kazeem Abidoye Odeyemi, Mutairu Kayode Kolawole
Quantitative Analysis Of Cholera Dynamics And The Impact Of Integrated Control Measures., Kazeem Abidoye Odeyemi, Mutairu Kayode Kolawole
Tanzania Journal of Science
A comprehensive mathematical evaluation of cholera dynamics, emphasizing the crucial role of optimal control strategies which include vaccination, treatment in endemic region and environmental hygiene in controlling the disease spread in Western and Mid-Eastern regions of African setting. Through analysis of the local and global stability of the model and assessing the reproduction number (��0), this research highlights how targeted interventions can influence transmission rates of cholera disease. Sensitivity analysis identifies key parameters driving cholera dynamics, underlining the urgency of timely and adequate intervention. Utilizing the innovative Homotopy Perturbation Method for the numerical simulation, the study explores the interplay between …
Projections Of The Characteristics Of Extreme Precipitation In East Africa Using Bias-Corrected Cmip6 Models, Exavery K. Makula
Projections Of The Characteristics Of Extreme Precipitation In East Africa Using Bias-Corrected Cmip6 Models, Exavery K. Makula
Tanzania Journal of Science
In the context of ongoing global climate change, the intensification of the hydrological cycle is expected to modify the frequency, magnitude, and spatial distribution of extreme precipitation events. Understanding how precipitation extremes will evolve under climate change is critical for East Africa (EA), a region highly vulnerable to hydroclimatic hazards and strongly dependent on rainfall-driven socioeconomic systems. The region experiences two main rainfall seasons, namely the long rains (March-May, MAM) and the short rains (October-December, OND). This study investigates future projections of the characteristics of extreme precipitation across the EA using an ensemble of biascorrected CMIP6 global climate models. Extreme …
Assessment Of Fecal Indicator Bacteria And Vendors' Handling Practices For Safety Of Salads And Raw Leafy Vegetables In Dar Es Salaam, Tanzania, Gloria B. Mrisho, Thomas J. Lyimo, Godwill D. Mrema
Assessment Of Fecal Indicator Bacteria And Vendors' Handling Practices For Safety Of Salads And Raw Leafy Vegetables In Dar Es Salaam, Tanzania, Gloria B. Mrisho, Thomas J. Lyimo, Godwill D. Mrema
Tanzania Journal of Science
Fresh leafy vegetables have gained popularity in Tanzanian cities due to their nutritional benefits and increased promotion by health practitioners. Assessment of their microbiological quality and safety is essential for determination of associated health risks. This study enumerated Fecal Indicator Bacteria (FIB) for determination of microbiological quality and safety of fresh leafy vegetable salads sold by street vendors and raw leafy vegetables obtained from Sinza market in Dar es Salaam. Handling practices, awareness and consumer satisfaction on the safety of leafy vegetable salads was also assessed among salad street vendors and consumers. Samples were collected from four stations and analyzed …
An Age-Structured Model For The Effects Of Time Delay On The Dynamics Of Malaria In The Presence Of Temperature And Rainfall, Alanus Mapunda, Eunice Mureithi, Nyimvua Shaban
An Age-Structured Model For The Effects Of Time Delay On The Dynamics Of Malaria In The Presence Of Temperature And Rainfall, Alanus Mapunda, Eunice Mureithi, Nyimvua Shaban
Tanzania Journal of Science
An age-structured model with a class of pregnant women that captures the impact of time-delay on the dynamics of malaria is established in this work. The main goal is to explore the transmission dynamics of malaria in natural setting which is comprised of pregnant women and other individuals. Some weather conditions are also considered in the model. The main importance is to investigate the evolution of various states involved in the transmission of malaria in the community. The model equilibria are analyzed to study their stability, and numerical solution of the system is presented and discussed. The result shows that …
Multi-Objective Optimization Of Waste Incineration For Minimal Carbon Monoxide And Sulfur Dioxide Emission And Rate Maximization: A Case Study Of Mbezi, Mkuranga-Pwani, Tanzania, Grangay M. Nyanghura, Enock W. Nshama
Multi-Objective Optimization Of Waste Incineration For Minimal Carbon Monoxide And Sulfur Dioxide Emission And Rate Maximization: A Case Study Of Mbezi, Mkuranga-Pwani, Tanzania, Grangay M. Nyanghura, Enock W. Nshama
Tanzania Journal of Science
Incineration is widely employed for hazardous waste disposal, but results in harmful flue gas emissions. This study optimizes a double-chamber incineration process to reduce sulfur dioxide (SO2) and carbon monoxide (CO) emissions while maximizing the incineration rate. The effects of waste mass, primary chamber temperature (PT), and secondary chamber temperature (ST) were analyzed using a full factorial design of 27 experiments. ANOVA revealed that mass had the greatest impact on emissions and incineration time, ST had a moderate effect, and PT had little influence. Regression analysis provided models for incineration time, CO, and SO2 emissions. Single-objective optimization using sequential quadratic …
Comparative Study Of Cement-Rice Husk Ash Stabilized Bricks And Fired Clay Bricks, Daniel R. Samson, Emmanuel S. Leo
Comparative Study Of Cement-Rice Husk Ash Stabilized Bricks And Fired Clay Bricks, Daniel R. Samson, Emmanuel S. Leo
Tanzania Journal of Science
In some countries, fired clay bricks (FCBs) are widely used for construction, but their production is energy-intensive, relies largely on firewood, and contributes to deforestation and carbon emissions. This study explores unfired clay bricks stabilised with cement and rice husk ash (RHA) as a sustainable alternative, using Dakawa ward in the Morogoro Region, Tanzania, as a case study. The bricks, with a clay of plasticity index 17%, were stabilized with 6%, 10%, and 14% cement by mass, moulded into 40 mm cubes, and cured for 28 days. The compressive strengths achieved were 1.5, 3.6, and 4.1 MPa with water absorption …
Honey Bees (Apis Mellifera) Pollination Enhances Watermelon (Citrullus Lanatus) Yield In Kibaha Tanzania, Beatrice Tonola, Charles Olambo Joseph, Mkabwa L.K. Manoko, Shibonage K. Mashilingi
Honey Bees (Apis Mellifera) Pollination Enhances Watermelon (Citrullus Lanatus) Yield In Kibaha Tanzania, Beatrice Tonola, Charles Olambo Joseph, Mkabwa L.K. Manoko, Shibonage K. Mashilingi
Tanzania Journal of Science
Honey bees are essential pollinators of the world’s food crops. However, information on the influence of honey bee pollination on watermelon yield is limited in Tanzania. This study assessed efficiency of honey bee pollination on watermelon yield. The study tested three improved watermelon varieties (Zebra F1, Candy F1 and Sukari F1) and three pollination environments: (Caged with Apis mellifera (CAM), Caged without insects (CW) and Open pollination (OP) in two seasons. The experiment was arranged in a split-plot design in randomized complete block design (RCBD) with three replications. Results showed no significant interaction between pollination environment and varieties. Significant difference …
Effects Of Substrate–Supplement Interactions On Yield Performance Of Oyster Mushroom (Pleurotus Ostreatus), Charles O. Joseph, Faraja Makwinja
Effects Of Substrate–Supplement Interactions On Yield Performance Of Oyster Mushroom (Pleurotus Ostreatus), Charles O. Joseph, Faraja Makwinja
Tanzania Journal of Science
Different substrates and supplements are used in mushroom production, however their interaction effects and growth variables affected is little known. This study was conducted to compare the effects of substrate-supplement interactions on growth and yield of oyster mushrooms Pleurotus ostreatus. Two substrates (banana leaves and sawdust) and two supplements (chicken manure and sugar) were investigated. The substrates were reduced to 2 cm pieces and steam sterilized at 80–100°C for 3 hours. In each bag containing specific substrate, the supplements were added as 2% of the total substrate. The spawn was inoculated from each bag; misting was applied to maintain constant …
Heavy Metal Contamination In Agricultural Soils And Potential Human Health Risks, Debora Michael Mwenda, Leonard Masesa Jumanne, Daudi Salvius Mgaya, Amos Vincent Ntarisa
Heavy Metal Contamination In Agricultural Soils And Potential Human Health Risks, Debora Michael Mwenda, Leonard Masesa Jumanne, Daudi Salvius Mgaya, Amos Vincent Ntarisa
Tanzania Journal of Science
Heavy metal contamination in agricultural soils is a growing concern due to potential human health risks via ingestion, dermal contact, and inhalation. However, data on fertiliser-related contamination in rural Tanzanian settings remain limited. This study assessed contamination levels and associated health risks in Kibwabwa village, Iringa, Tanzania. A total of 48 soil samples were collected from eight farms at a depth of 0–15 cm. Concentrations of Cu, Zn, Ni, Cd, Cr, and Pb were determined using Atomic Absorption Spectroscopy (AAS). Health risks were evaluated using chronic daily intake (CDI), hazard quotient (HQ), hazard index (HI), and carcinogenic risk (CR) models …
Antibacterial Activity Of Sapium Ellipticum, Securidaca Longepedunculata, And Allophylus Africanus Against Drug-Resistant Pseudomonas Aeruginosa Isolates, Eleonora A. Mbare, Rose J. Masalu, Cyprian B. Mpinda
Antibacterial Activity Of Sapium Ellipticum, Securidaca Longepedunculata, And Allophylus Africanus Against Drug-Resistant Pseudomonas Aeruginosa Isolates, Eleonora A. Mbare, Rose J. Masalu, Cyprian B. Mpinda
Tanzania Journal of Science
Pseudomonas aeruginosa poses a major clinical challenge due to its high levels of antibiotic resistance. This study evaluated the antibacterial activity of three medicinal plant extracts Allophylus africanus (leaves), Securidaca longepedunculata (root bark), and Sapium ellipticum (stem bark), against 30 drug-resistant P. aeruginosa isolates. Antibacterial screening was conducted using the agar well diffusion method, followed by determination of minimum inhibitory concentrations (MICs) via a 96-well microtiter plate assay. All three plant extracts demonstrated inhibitory activity against three resistant P. aeruginosa strains (gentamicin-resistant strains F4 and GR4RAU-AI, and ceftazidime-resistant strain 19-10), with inhibition zones of varying diameters. MIC values showed strain-specific …
Optimization Of Image Quality Of Simulated Multiple Detectors Computed Tomography Acquisition Parameters Using Machine Learning And Catphan Phantom, Ali O. Masoud, Najat K. Mohammed, Khamis O. Amour, Ahmed M. Jusabani, Denise Mwalongo, Mwingereza John Kumwenda
Optimization Of Image Quality Of Simulated Multiple Detectors Computed Tomography Acquisition Parameters Using Machine Learning And Catphan Phantom, Ali O. Masoud, Najat K. Mohammed, Khamis O. Amour, Ahmed M. Jusabani, Denise Mwalongo, Mwingereza John Kumwenda
Tanzania Journal of Science
The study successfully employed Monte Carlo (MC) simulation and a Machine Learning (ML) approach using a Random Forest Regression (RFR) model to develop optimized Multi-Detector CT (MDCT) protocols that significantly reduce radiation dose while maintaining diagnostic image quality. The MC engine accurately modeled X-ray spectra, and the RFR model demonstrated high predictive power for key metrics, achieving R2 scores of 0.97 for CTDIvol and over 0.92 for image quality metrics (Noise, CNR). Through multi-objective optimization guided by the RFR, the final protocol (Optimization-3) was found on the Pareto front, achieving a notable 35% dose reduction (from 15.5 mGy to 9.9 …
Experimental And Simulation Analysis For Different Pot-In-Pot Indirect Heating Scenarios For Cooking Applications, Pamella K. Kajumba, Jimmy Chaciga, Denis Okello, Karidewa Nyeinga
Experimental And Simulation Analysis For Different Pot-In-Pot Indirect Heating Scenarios For Cooking Applications, Pamella K. Kajumba, Jimmy Chaciga, Denis Okello, Karidewa Nyeinga
Tanzania Journal of Science
The paper presents simulation and experimental results to demonstrate heat transfer performance during cooking that can be practical in pot-in-pot arrangements for indirect cooking/heating. The cases included single pots, pot-in-pot with oil, and pot-in-pot with no oil. The aim was to optimize the heat transfer through conduction and the cooking process for a recently developed small-scale sensible heat storage system integrated with a cooking unit. Cooking experiments reported were carried out using an electric hot plate with a power rating of 1.8 kW, 220V. Temperature measurements were recorded using a TC-08 data logger. The heating rates were analyzed for the …
Appropriate Wireless Technology For Blue Data Communication To Enhance Artisanal Fishery, Abdi T. Abdalla, Eva Shayo, Angelina Misso, Baraka Maiseli, Kwame S. Ibwe, Narriman Jiddawi, Moses Ismail
Appropriate Wireless Technology For Blue Data Communication To Enhance Artisanal Fishery, Abdi T. Abdalla, Eva Shayo, Angelina Misso, Baraka Maiseli, Kwame S. Ibwe, Narriman Jiddawi, Moses Ismail
Tanzania Journal of Science
The paper examines the development of a system architecture to support smart fishing. This includes the establishment of a blue data center, which would allow government agencies and research institutions to access fisheries data. The goal is to provide policymakers with the tools they need to efficiently manage artisanal fisheries resources. The architecture also incorporates wireless communication components that are suitable for small-scale fishers in remote areas. The study delves into the selection of appropriate wireless communication technology for transmitting fishing data to the communication center. Factors such as coverage range, data rates, and cost implications are taken into consideration. …
Qualitative And Numerical Observations Into The Career Trajectories Of Early Career Academics: A Mathematical Model Approach, Oluwatayo M. Ogunmiloro
Qualitative And Numerical Observations Into The Career Trajectories Of Early Career Academics: A Mathematical Model Approach, Oluwatayo M. Ogunmiloro
Tanzania Journal of Science
This study develops and analyzes a mathematical model that describes the interplay among different researcher groups within academia by focusing on how variables such as mentorship, access to funding, and academic peer influence affect the career trajectories of early-career, experienced, redundant, and successful researchers. Using stability theory and relevant theorems of differential equations, this study ensures the existence, uniqueness, positivity, and boundedness of the model's solutions. Additionally, the model’s equilibrium states, are analyzed to determine the local asymptotic stability. Numerical simulations using the Runge-Kutta fourth-order (RK4) method, implemented in Python, are performed to illustrate issues related to career growth within …