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Articles 151 - 180 of 1029
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Exergy Analysis And Performance Testing Of A Gravitational Water Vortex Turbine Runner For Small Hydropower Plants: An Experimental Approach, Adam Faraji, Yusufu Abeid Chande Jande, Thomas Kivevele
Exergy Analysis And Performance Testing Of A Gravitational Water Vortex Turbine Runner For Small Hydropower Plants: An Experimental Approach, Adam Faraji, Yusufu Abeid Chande Jande, Thomas Kivevele
Tanzania Journal of Science
Gravitational water vortex power plants (GWVPPs) have recently gained popularity due to their low initial investment, simple design, ease of maintenance, and low head utilization. However, the technology suffers from poor performance issues caused by the non-optimized parameters of its crucial components, such as the runner. In this study, the performance of a runner (16° blade-hub angle, six blades, and a curved blade profile) for a GWVPP was experimentally examined. The study also employed an exergy analysis. The experimental results revealed that the efficiency of the GWVPP system was in the range of 9.84% to 25.35%, the torque was in …
Radiation Doses To Patients Undergoing Common X-Ray Examinations From Selected Hospitals In Dar Es Salaam And Zanzibar, Tanzania, Ali O. Masoud, Mwingereza J. Kumwenda, Salum K. Salum, Ahmad M. Jusabani
Radiation Doses To Patients Undergoing Common X-Ray Examinations From Selected Hospitals In Dar Es Salaam And Zanzibar, Tanzania, Ali O. Masoud, Mwingereza J. Kumwenda, Salum K. Salum, Ahmad M. Jusabani
Tanzania Journal of Science
This study involved 300 patients, comprising 113 females and 187 males, from six X-ray units. The study focused on evaluating the patient dose for common X-ray examinations at selected hospitals in Dar es Salaam and Zanzibar, Tanzania. The achieved results were compared with previous studies and Diagnostic Reference Levels (DRLs). Entrance surface air kerma (ESAK) was calculated for chest posteroanterior (PA), cervical spine anteroposterior/lateral (AP/Lat), abdomen anteroposterior (AP), and lumbar spine anteroposterior/lateral (AP/LAT) examinations. The study results revealed the following average ESAK values: chest posteroanterior (PA), 0.34 mGy; abdomen anteroposterior (AP), 1.92 mGy; lumbar spine anteroposterior (AP), 2.78 mGy; and …
Performance Of A Bipolar Output Voltage Dc-Dc Converter For Voltage Regulation For Solar Pv System Application, Stampinus M. Stephano, Jackson. J. Justo, Bakari M. M. Mwinyiwiwa
Performance Of A Bipolar Output Voltage Dc-Dc Converter For Voltage Regulation For Solar Pv System Application, Stampinus M. Stephano, Jackson. J. Justo, Bakari M. M. Mwinyiwiwa
Tanzania Journal of Science
A combined Single-Ended Primary-Inductor Converter (SEPIC) and Cuk DC-DC converter that provides a bipolar outputs voltage at the DC bus is widely used in applications especially solar photovoltaic (SPV) system. Maintaining constant output voltages at the DC bus under variable loads and input voltage from SPV is of great interest to many researchers. This paper presents a 400 W mathematical model of a combined SEPIC and Cuk DC-DC converter through state space averaging (SSA) in a continuous conduction mode (CCM). A nested voltage and current control loops are used to regulate voltage and increase the performance of the converter. These …
Concentrations Of Rare Earth And Valuable Elements In Mkuju Uranium Cores For Recovery, Joshua Ndalusanye, Mohamed Mazunga
Concentrations Of Rare Earth And Valuable Elements In Mkuju Uranium Cores For Recovery, Joshua Ndalusanye, Mohamed Mazunga
Tanzania Journal of Science
Rare earth elements and valuable elements within Mkuju uranium core samples were analysed using EDXRF. Mean elemental concentrations for selected elements including Al, P, K, Ti, V, Mn, Fe, Y, Mo, Ag, Ba, La, Ce, and U were determined as 96445.79 μg/g, 547.19 μg/g, 25296.88 μg/g, 5926.33 μg/g, 116.26 μg/g, 455.02 μg/g, 60.1 μg/g, 142.34 μg/g, 15.8 μg/g, 493.98 μg/g, 67.53 μg/g, 118.68 μg/g, and 128.37 μg/g respectively. The Rare Earth elements: Y, La and Ce and valuable elements: Mo, Ag and U have enrichment factor of EF >1.5 which indicates that, these elements were formed from rocks through geological …
Adsorptive Performance Of Composite Of Sugarcane Bagasse Fibres And Multiwalled Carbon Nanotubes For Simultaneous Removal Of Multi–Pollutants From Wastewaters, Joseph W Sengasu, Joseph Yn Philip, Kessy F Kilulya
Adsorptive Performance Of Composite Of Sugarcane Bagasse Fibres And Multiwalled Carbon Nanotubes For Simultaneous Removal Of Multi–Pollutants From Wastewaters, Joseph W Sengasu, Joseph Yn Philip, Kessy F Kilulya
Tanzania Journal of Science
This paper reports on the performance of the prepared Sugarcane Bagasse Fibres – Multiwalled Carbon Nanotubes (SBF–MWCNTs) composite for simultaneous removal of Crystal Violet (CV), Pb(II), Cr(III), Cd(II) and Co(II) from the effluent using a fixed bed method. Different composites of SBF–MWCNTs biosorbent were prepared from mixtures of varied ratios of SBF and MWCNTs at 25 °C. The SBF–MWCNTs materials were characterized by FT-IR spectroscopy and thermogravimetric analysis. Crystallinity index and swelling behaviour of the materials were also determined. Thomas model linear equation was applied in the assessment of pollutants adsorption performance at different conditions. With a column height of …
The Impact Of Land Use And Land Cover Change On Water Quality In Lake Victoria Catchment: A Case Study Of Nkangabile River At Nyegezi Bay, Tanzania, Charles A Mashafi, Makemie Mabula, Masumbuko Semba, Charles N Ezekiel
The Impact Of Land Use And Land Cover Change On Water Quality In Lake Victoria Catchment: A Case Study Of Nkangabile River At Nyegezi Bay, Tanzania, Charles A Mashafi, Makemie Mabula, Masumbuko Semba, Charles N Ezekiel
Tanzania Journal of Science
Understanding the trends and impacts of anthropogenic activities in the water basins and catchments is key to the effective management and conservation of aquatic environments. This study analyses the land use and land cover (LULC) changes in the Nkangabile catchment and their impacts on water quality in the Nyegezi Bay of Lake Victoria, Tanzanian side. GIS and Remote sensing techniques were used to analyze the multi-temporal changes in LULC that occurred in the past 30 years from 1983 to 2013, split into four epochs of 10-year intervals. The changes in LULC were analyzed using image differencing and cross-tabulation for pairwise …
Application Of Combined Geophysical And Archaeological Survey Techniques: A Case Study Of Singida Region, Tanzania, Makarius Peter Itambu, Eliah Mwamakimbula1, Nasra Yahaya, Jasmine Kilela
Application Of Combined Geophysical And Archaeological Survey Techniques: A Case Study Of Singida Region, Tanzania, Makarius Peter Itambu, Eliah Mwamakimbula1, Nasra Yahaya, Jasmine Kilela
Tanzania Journal of Science
The seismically active Singida region in central Tanzania lies at the edge of the East African Rift System (EARS) which is locally designated the Gregory Rift. The archaeological record of the region, especially in the eastern part of the Ikungi District, unlike that of northern Tanzania, is comparatively unknown, despite early archaeological expeditions hinting at its potential. Recent research in the eastern area suggests that it preserves a long record of hominin occupation spanning the Early to Late Stone Age. This interdisciplinary field work, carried out between August 2022 to August 2023, resulted in the discovery of a relatively deep …
Vegetation Invasion Influences Waterbird Assemblages And Aquatic Environmental Parameters In Urban Areas Of Dar Es Salaam, Tanzania, Daudi O. Damas, Jasson R. John
Vegetation Invasion Influences Waterbird Assemblages And Aquatic Environmental Parameters In Urban Areas Of Dar Es Salaam, Tanzania, Daudi O. Damas, Jasson R. John
Tanzania Journal of Science
Waste Stabilisation Ponds (WSPs) serve as refuge habitats for waterbirds in response to the decline of natural wetlands especially in urban settings. Various sewage treatment stages within WSPs attract waterbirds differently based on the specific characteristics of each stage. This study examines the influence of treatment stages on both vegetated and non-vegetated WSPs over a period of one year in Dar es Salaam, Tanzania. Bird surveys were periodically conducted at each treatment stage along with different environmental variables; dissolved oxygen, electrical conductivity, water turbidity, water temperature, pH, and invertebrate biomass. In non-vegetated WSPs, waterbird densities and invertebrate biomass were significantly …
Forest Management Optimization Scenarios For Climatic And Economic Benefits Generated From Tectona Grandis Plantation In Muheza, Tanzania, Omari S. Mgoo, Beatus J. Temu, Japhet N. Mwambusi, Shabani A. O. Chamshama
Forest Management Optimization Scenarios For Climatic And Economic Benefits Generated From Tectona Grandis Plantation In Muheza, Tanzania, Omari S. Mgoo, Beatus J. Temu, Japhet N. Mwambusi, Shabani A. O. Chamshama
Tanzania Journal of Science
Globally, multiple ecosystem services are increasingly becoming an important agenda in sustainable forest management. However, it is still unclear which forest management practices would lead to an optimal bundle of ecosystem services promoting sustainability. This study aimed to determine whether implementing thinning schedule and 30 years rotation age has implications on the provision of ecosystem services and economic benefits of Teak stands in Tanzania. Carbon quantification and cost-benefit analysis methods were used to study the climatic and economic benefits of wood production and carbon sequestration under five scenarios where three thinning schedules and 30 years rotation age were the baseline. …
Evaluation Of Therapeutic Efficacy Of Aloe Rabaiensis Leaf Against Salmonella Gallinarum Challenged In Kuroiler Chicks In Arusha, Tanzania, Mwanaisha S. Mkangara
Evaluation Of Therapeutic Efficacy Of Aloe Rabaiensis Leaf Against Salmonella Gallinarum Challenged In Kuroiler Chicks In Arusha, Tanzania, Mwanaisha S. Mkangara
Tanzania Journal of Science
Salmonella gallinarum, a bacterium causing fowl typhoid in gallinaceous birds, poses significant economic challenges to the chicken industry in Tanzania. This study investigated the potential of Aloe rabaiensis in managing S. gallinarum in Kuroiler chicks. The clinical signs, viable cell count, live weight, heterophils, lymphocytes, and monocyte counts were evaluated using ninety-four chicks grouped into T1, T2, T3 (challenged with S. gallinarum), and T4 (unchallenged with S. gallinarum). The findings revealed no statistically significant differences between the treated and control groups (P > 0.05) in viable cell count, live weight, mortality rate, heterophils, lymphocytes, and monocyte counts. However, there were clinical …
Prevalent Chronic Infections Modulate T-Cell Phenotypes And Functions Enhancing Hiv Susceptibility, Dissemination, And Persistence In African Population, Thomas F. Marandu, Mkunde S. Chachage
Prevalent Chronic Infections Modulate T-Cell Phenotypes And Functions Enhancing Hiv Susceptibility, Dissemination, And Persistence In African Population, Thomas F. Marandu, Mkunde S. Chachage
Tanzania Journal of Science
While many studies have associated HIV prevalence with socio-economic status, few have explored the host's immunity status prior to HIV infection. High HIV prevalence in Africa may in part be contributed by a high prevalence of other persistent infections that modulate the host immunity towards phenotypes that promote HIV acquisition. In this narrative review, we examined how four most prevalent pathogens in Africa (human papillomavirus, herpesviruses, Mycobacterium tuberculosis, and helminth infections) modulate immunity to favor their survival and in turn, also influence HIV acquisition. We have described how these pathogens expand the number of memory and activated T cells, increase …
Levels Of Aflatoxins In Selected Spices Marketed In Dar Es Salaam And Zanzibar, Tanzania, Khadija S Ali, Clarence A Mgina, Kessy F Kilulya
Levels Of Aflatoxins In Selected Spices Marketed In Dar Es Salaam And Zanzibar, Tanzania, Khadija S Ali, Clarence A Mgina, Kessy F Kilulya
Tanzania Journal of Science
Aflatoxins are produced by fungi species known as Aspergillus flavus and Aspergillus parasiticus which invade crops like maize, oilseeds, and spices. This study investigated the levels of aflatoxins in four selected types of spices marketed in Dar es Salaam and Zanzibar in Tanzania to determine the incidence of human exposure to aflatoxin through the consumption of spices as food additives. A total of 72 samples of selected spices (25 cinnamon, 16 ginger, 20 cloves, and 11 mixed spices) were collected from farms (Zanzibar), markets and stores in Dar es Salaam and Zanzibar. Aflatoxins B1, B2, G1, G2, and total aflatoxins …
Investigation Of A Choke Valve Erosion In The Gas Lifted Systems, Kaindi Mandilindi, Simon I Marandu
Investigation Of A Choke Valve Erosion In The Gas Lifted Systems, Kaindi Mandilindi, Simon I Marandu
Tanzania Journal of Science
Erosion is one of the common causes of failure in subsea operations. However, erosion of subsea systems has many patterns, trends and uncertainties. This has led to production losses due to the failure of prediction of the useful life of the components in the gas lifted system. This work experimentally studied the effect of flow rate and pressure variations on the erosion of the choke valve in the gas lifted system by using flow streams containing either liquid or liquid injected with gas. Cameras installed on both sides of the erosion box captured images of the probe after every one …
Acute Toxicity Assessment Of Centella Asiatica And Bidens Pilosa Aqueous Crude Leaf Extracts In Pregnant Rat Model, Emmanuel J. Michael, James P. Lissu, Cyprian Mpinda, Flora Stephano
Acute Toxicity Assessment Of Centella Asiatica And Bidens Pilosa Aqueous Crude Leaf Extracts In Pregnant Rat Model, Emmanuel J. Michael, James P. Lissu, Cyprian Mpinda, Flora Stephano
Tanzania Journal of Science
There is little information on the safety of using traditional medicines during pregnancy. The current study assessed the safety of aqueous crude leaf extracts from two medicinal plants; Centella asiatica L. and Bidens pilosa L. in pregnant rats. Acute toxicity was evaluated by administering a single dose of plant extracts to pregnant rats at three standard doses of 1000, 2000 and 5000 mg/kg for 14 days. Distilled water was used as a negative control. Physiological and behavioural responses were assessed at 30 minutes, 1 hour, 4 hours, 12 hours and every other day until gestation day 22. The pregnant rats …
Application Of Time-Varying Mortality Rate Model In Pension System: A Case Of Tanzania, Samya Suleiman, John Andongwisye, Emmanuel E. Sinkwembe, Karl Lundengård
Application Of Time-Varying Mortality Rate Model In Pension System: A Case Of Tanzania, Samya Suleiman, John Andongwisye, Emmanuel E. Sinkwembe, Karl Lundengård
Tanzania Journal of Science
The current increase in the ageing population, driven by a decrease in mortality rates, has impacted most pay-as-you-go defined benefit pension schemes. The resulting increase in the dependency ratio places a greater burden on these schemes. Many pension funds currently use static lifetables to project future obligations, overlooking the gradual decline in mortality rates. This study explores the application of a time-varying mortality rate model to forecast Tanzanian mortality rates. The time-varying model was successfully employed together with multi state method to project and analyse the funding ratio and cashflow to asset value ratio of the mandatory Tanzania Public Service …
Effects Of Coagulant Dosage, Particle Size, And Settling Time On Pond Water Treatment With Cactus Pads And Watermelon Seeds, Mahir M Said, Neema O Msuya
Effects Of Coagulant Dosage, Particle Size, And Settling Time On Pond Water Treatment With Cactus Pads And Watermelon Seeds, Mahir M Said, Neema O Msuya
Tanzania Journal of Science
Most Tanzanians who live in villages still struggle to get enough drinking water due to limited supply, so they use pond water for drinking and household purposes. Treatment of this water is crucial especially during the rainy season to reduce its turbidity. The performance of two natural coagulants (i.e., Cactus pads and watermelon seeds) was evaluated in their effectiveness in purifying pond water. The jar test method was used to analyze the effects of coagulant particle size, dosage, and settling time on the treatment of pond water. Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR) was used for characterizing the …
Thermal Behavior Of Bio-Fibers Reinforced Paving Bricks, John K. Makunza
Thermal Behavior Of Bio-Fibers Reinforced Paving Bricks, John K. Makunza
Tanzania Journal of Science
Paved areas are among sources of ambient temperature rise due to heat radiation that has been absorbed by pavement materials and then released into the air. The materials that are widely used in paving grounds include concrete, asphalt concrete and cement sand bricks. The paved surfaces absorb the incoming solar radiation from the sun, which is converted into heat, resulting into higher surface temperature than the ambient air temperature, thus contributing to the global warming. In an attempt to solve this problem, a study on paving bricks reinforced with bio-fibers has been done aiming at establishing the thermal behavior of …
Effect Of Increasing Amount Of Sisal Fabric On Density, Compressive Strength And Flexural Strength Of Sisal Fabric Reinforced Concrete Composite, John K Makunza, Arnold N Towo
Effect Of Increasing Amount Of Sisal Fabric On Density, Compressive Strength And Flexural Strength Of Sisal Fabric Reinforced Concrete Composite, John K Makunza, Arnold N Towo
Tanzania Journal of Science
This study examines the impact of adding plain-woven sisal fibres on the mechanical characteristics of sisal reinforced concrete composites. Analysis of the mechanical strength was done in relation to their density, compressive strength, and flexural strength. The sisal fabric composite matrix contained up to four layers of sisal fabric, which was either NaOH treated or untreated. The properties of sisal fabric reinforced concrete were compared to those of steel reinforced concrete. With addition of layers of sisal fabric, the flexural strength of both NaOH-treated and untreated concrete composites increased to a maximum of 18.2 MPa, which was less than steel …
Performance Evaluation Of The Physical And Combustion Properties Of Faecal Sludge Derived Briquettes Using Different Binding Materials, Alphonce J. Haruna, Richard Kimwaga, Edwin N. Richard
Performance Evaluation Of The Physical And Combustion Properties Of Faecal Sludge Derived Briquettes Using Different Binding Materials, Alphonce J. Haruna, Richard Kimwaga, Edwin N. Richard
Tanzania Journal of Science
This research aimed at evaluating the performance of faecal sludge briquettes on the quality of briquettes produced in terms physical and combustion properties. Specifically, the research determined the physical and combustion properties of briquette produced from faecal sludge bond with cassava peel, sunflower cake, banana peel and waste paper binders. Physical and combustion properties of the binder materials and briquettes produced were analysed in the Water Resource Engineering laboratory. The laboratory analysis of the combustion properties showed that the Sunflower cake binder had highest calorific value of 16.24 MJ/Kg when compared to other binders including banana peels, cassava peels and …
Effects Of Urea Fertilizer On Yield And Water Productivity Of Amaranthus Viridis In The Tropical Rainforest And The Derived Savanna Of Nigeria, Kabiru A Shittu, Omotayo B Adeboye, Durodoluwa J Oyedele, Abdul-Salam M Murtadha
Effects Of Urea Fertilizer On Yield And Water Productivity Of Amaranthus Viridis In The Tropical Rainforest And The Derived Savanna Of Nigeria, Kabiru A Shittu, Omotayo B Adeboye, Durodoluwa J Oyedele, Abdul-Salam M Murtadha
Tanzania Journal of Science
The experiment was conducted using a lysimeter in June, 2014 in Saki (Derived Savanna) and Ile-Ife (Tropical Rainforest) to determine the crop coefficients and the effects of Urea fertilizer on the yield and water productivity of Amaranthus viridis in Nigeria. The loamy sandy soil in the top 15 cm was sampled, air-dried and analysed. Eighteen (18) kg of the air-dried and sieved soils were weighed into the thirty-two (32) lysimeters. Drill method was used for the sowing and the seeds were spread within 2 cm in the lysimeter. Urea fertilizer was applied at 0, 40, 80 and 160 kg N/ha …
Assessment Of Onshore Wind Farm Performance To Geometric Layout Choices By Utilizing Mesoscale Modelling Techniques, Rajabu Juma Mangara, Laban Lameck Kebacho
Assessment Of Onshore Wind Farm Performance To Geometric Layout Choices By Utilizing Mesoscale Modelling Techniques, Rajabu Juma Mangara, Laban Lameck Kebacho
Tanzania Journal of Science
Previous studies have shown that the average losses of wind power production due to the wind turbine wake effect within operating wind farms is between 10% to 20% of the overall power output. Among other factors, it is reviled that, the wind farm array layout can contribute significantly to both wake effect and power loss at the wind farm site. This study employs mesoscale modelling techniques to assess the effect of geometric layout on the onshore wind farms performance. Geometric layout can be defined by the spacing and alignment (e.g. staggered or aligned) of the wind turbines with respect to …
Diffusion-Steered Algorithm For Improving Quality Of Images Generated By Electrical Capacitance Tomography Measurement System, George Nyotoka, Nassor Ally, Josiah Nombo
Diffusion-Steered Algorithm For Improving Quality Of Images Generated By Electrical Capacitance Tomography Measurement System, George Nyotoka, Nassor Ally, Josiah Nombo
Tanzania Journal of Science
Electrical Capacitance Tomography (ECT) is a non-invasive, non-intrusive, radiation-free, robust, and cost-efficient measurement system that generates cross-sectional images of industrial operations by measuring differences in dielectric properties within a container. Despite its advantages, the poor quality of reconstructed images limits its applicability. Researchers have explored both non-iterative and iterative methods to address this issue, yet the resulting image quality remains insufficient for high-stakes applications where accurate decision-making is critical. This study proposes a novel algorithm that integrates the ECT model with a diffusion-steered image denoising functional, enhancing the quality of ECT reconstructed images beyond existing methods. Empirical comparisons show that …
Stability Of Thermochromic Vanadium Dioxide Thin Films In Harsh Environments Of Temperature And Humidity, Nuru R Mlyuka
Stability Of Thermochromic Vanadium Dioxide Thin Films In Harsh Environments Of Temperature And Humidity, Nuru R Mlyuka
Tanzania Journal of Science
Stability of thermochromic VO2 thin films against harsh environmental conditions, which is important if the films are to be used in practical smart windows, was investigated. The films were prepared on normal soda-lime glass substrates by reactive radio frequency magnetron sputtering of metallic vanadium target (99.95% purity) at a working pressure of mbar, argon and oxygen flow rates of 76 and 1.4 – 3.0 ml/min, respectively, substrate temperature of 400 °C and sputtering power of 150 watts. After deposition, the films were exposed to extreme temperatures and relative humidity at 100 °C, 400 °C and 89%, respectively, for different time …
The Analysis Of A Co-Dynamic Ebola And Malaria Transmission Model Using The Laplace Adomian Decomposition Method With Caputo Fractional-Order, Akeem Olarewaju Yunus, Morufu Oyedunsi Olayiwola
The Analysis Of A Co-Dynamic Ebola And Malaria Transmission Model Using The Laplace Adomian Decomposition Method With Caputo Fractional-Order, Akeem Olarewaju Yunus, Morufu Oyedunsi Olayiwola
Tanzania Journal of Science
The study presents a novel mathematical framework for addressing Ebola and malaria concerns in Sub-Saharan Africa that combines Laplace transformation with Caputo fractional order derivative. It takes into account socioeconomic aspects that influence disease dynamics and uses the basic reproduction number to quantify transmission dynamics. Extensive numerical simulations using Maple 18 software are used to investigate the effect of fractional order derivatives on disease dynamics. It shows how the Laplace-Adomian decomposition approach simplifies nonlinear equations and generates control solutions. It emphasizes the necessity of turning discoveries into concrete plans and encourages stakeholders to be proactive in implementing them. Overall, the …
Assessment Of Bottled Drinking Water Quality, Safety And Community Perceptions In Dodoma City, Tanzania, Jackson H. Katonge, Mussa A. Namangaya
Assessment Of Bottled Drinking Water Quality, Safety And Community Perceptions In Dodoma City, Tanzania, Jackson H. Katonge, Mussa A. Namangaya
Tanzania Journal of Science
The popularity of bottled drinking water stems from its convenience and purity, driving its rapid growth, but concerns about safety and quality persist. Physicochemical and microbiological parameters of bottled drinking in Dodoma City were evaluated from September to December 2023. Additionally, key informant interviews and questionnaire surveys were conducted with government regulators, producers, and consumers on regulatory frameworks, production processes, and consumer perceptions. Overall, all brands tested were suitable for drinking and met World Health Organization and Tanzania Bureau of Standards guidelines. The total dissolved solids (F = 0.86, p < 0.05), calcium (F = 5.26, p < 0.05) and chloride (F = 0.32, p < 0.05) were significantly different, while other parameters were not (p > 0.05) between measured and labelled values. The total viable and …
Effect Of Post-Harvest Handling Conditions On Polyphenol Content And Ferric Reducing Antioxidant Properties Of Selected Ugandan Sweet Potato Varieties, Agnes Nabubuya, Yusuf Byaruhanga, Ali Mwakha, Judith Narvhus
Effect Of Post-Harvest Handling Conditions On Polyphenol Content And Ferric Reducing Antioxidant Properties Of Selected Ugandan Sweet Potato Varieties, Agnes Nabubuya, Yusuf Byaruhanga, Ali Mwakha, Judith Narvhus
Tanzania Journal of Science
Sweet potatoes are rich in nutrients, including bioactive compounds like carotenoids and polyphenols. This study provided information on the effect of postharvest handling conditions; curing (direct sunshine) and ambient storage on the total carotenoids, total polyphenols and antioxidant activity of five Ugandan sweet potato varieties. The total carotenoid content was determined following Rodriguez and Kimura's method, while total polyphenol content and antioxidant activity were assessed using Folin-Ciocalteu’s reagent and the FRAP assay, respectively. Findings showed significant variation in total carotenoids, total polyphenol content and antioxidant activity of the different sweet potato varieties. There was an increase in total carotenoids in …
In-Situ Investigation Of Kinetics Of Phase Transformation Of Ti54m Titanium Alloy By Electrical Resistivity, Richard J Katemi
In-Situ Investigation Of Kinetics Of Phase Transformation Of Ti54m Titanium Alloy By Electrical Resistivity, Richard J Katemi
Tanzania Journal of Science
The kinetics of phase transformation of Ti54M titanium alloy was investigated using electrical resistivity measurement for different heating cycles. The resulting microstructure parameters were analyzed using Aphelion software. It was found that α-phase starts to decompose to β-phase is between 600°C and 780°C. The temperature at which 100% β-phase was formed is 965°C. Beyond the temperature at which α-phase starts to decompose and despite the high heating rate of 10 °C/s, a rapid decrease of electrical resistivity which is attributed to dissolution of -phase was observed. During isothermal holding, equilibrium was reached in about 15 minutes regardless of the holding …
Image Reconstruction Method Based On Iterative Linear Back Projection And Logistic Forward Solver For Electrical Capacitance Tomography Measurement System, Alfred Mwambela, Josiah Nombo
Image Reconstruction Method Based On Iterative Linear Back Projection And Logistic Forward Solver For Electrical Capacitance Tomography Measurement System, Alfred Mwambela, Josiah Nombo
Tanzania Journal of Science
Image reconstruction is one of the important tasks in the application of electrical capacitance tomography (ECT) systems. Though numerous algorithms have been implemented, it is often challenging to obtain satisfactory images in all imaging regions by the use of a single algorithm due to the soft-field nature of ECT systems. The preferred iterative reconstruction algorithms are highly computationally inefficient. A new iterative reconstruction algorithm is proposed which combine iterative Linear Back Projection and Logistic Regression. In this method, the solution to the ECT forward problem is implemented using logistic regression, whereas the ECT inverse problem is solved using the algebraic …
Performance Comparison Of Deep Learning Models In Predicting Hiv Incidences In Tanzania, Zaituni Kaijage, Honest Kimaro, Hellen Maziku
Performance Comparison Of Deep Learning Models In Predicting Hiv Incidences In Tanzania, Zaituni Kaijage, Honest Kimaro, Hellen Maziku
Tanzania Journal of Science
Human immunodeficiency virus infection/acquired immune deficiency syndrome (HIV/AIDS) is a global pandemic that has claimed more than 40 million lives since it was discovered in the late 1970s. In sub-Saharan Africa, including Tanzania. Different measures to combat the diseases have failed to be attained, like the UNAIDS 90-90-90 target, which aimed to reduce HIV by 2020, and it was moved to 2030. The availability of proper tools to control and monitor diseases and ensure proper early intervention is very important. Prediction of disease trends using Machine Learning (ML) models can improve speed towards attaining the UNAIDS targets by providing accurate …
Geological Structure And Possible Mineralized Zones In Ikungi – Manyoni Area, Tanzania: Delineated From High-Resolution Aeromagnetic Data, Raymond K. Pius, Michael M. Msabi
Geological Structure And Possible Mineralized Zones In Ikungi – Manyoni Area, Tanzania: Delineated From High-Resolution Aeromagnetic Data, Raymond K. Pius, Michael M. Msabi
Tanzania Journal of Science
Understanding geological structures is important in mineral exploration. Delineating subsurface geological structures, structural intersections, and complexities of potential geological settings for the formation of hydrothermal mineral deposits, such as gold requires using magnetic data, particularly, high-resolution aeromagnetic data. To define possible targets for mineral exploration, this study used linear detection and the Centre for Exploration Targeting (CET) techniques on high-resolution aeromagnetic data for structural delineation and interpretation. The study's conclusions indicate that the majority of geological features, such as faults, shears, fault intersections, and fracture systems, trend NE-SW, N-S, and occasionally NW-SE. These structures create potentially large areas that have …