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The Effects Of Corporate Culture On Firm Growth: Evidence From Tanzania’S Construction Firms, Fred P. Okangi
The Effects Of Corporate Culture On Firm Growth: Evidence From Tanzania’S Construction Firms, Fred P. Okangi
Tanzania Journal of Engineering and Technology (TJET)
Corporate culture is one of those important aspects that determine the growth of firms. This study investigates the effects of the different types of corporate culture on the growth of Tanzania’s local construction firms. A survey of 227 Tanzania’s construction firms was undertaken using semi-structured questionnaire. The data collected were quantitatively analysed using Stata 13.0 software. The study results indicate that only the hierarchy type of corporate culture positively and significantly impacts the growth of Tanzania’s construction firms. The other types of corporate culture, such as adhocracy, market, and clan had insignificant effects on the growth of the construction firms …
Exploring The Transformation Of Sustainable Collective Spaces: A Study From Mlalakuwa Informal Settlement, Jacob Lutta
Exploring The Transformation Of Sustainable Collective Spaces: A Study From Mlalakuwa Informal Settlement, Jacob Lutta
Tanzania Journal of Engineering and Technology (TJET)
A major challenge in collective space transformation is addressing the complexity of informal urbanisation in developing countries. Using a case study approach, this paper examines the concerns related to a particular informal settlement's sustainable collective space transformation. One of the key findings is that the absence of formal rules and regulations in the development of informal settlements in combination with land-grabbing leads to the absence of open spaces that could be used collectively. It is observed that sustainability in urban development is another body of critical thought that integrates several streams of current urban elements and embodies various conceptions of …
Investigations Of Cell Tower Antennas Parameters On Reduction Of Radio Frequency Radiation Levels From Radio Base Stations, Florence U. Rashidi
Investigations Of Cell Tower Antennas Parameters On Reduction Of Radio Frequency Radiation Levels From Radio Base Stations, Florence U. Rashidi
Tanzania Journal of Engineering and Technology (TJET)
The widespread deployment of mobile cellular base stations in populated areas has raised public health concerns due to increased exposure to radio frequency (RF) radiation emissions. Exposure to high levels of RF radiation can have potential thermal and non-thermal biological effects. Optimizing the configuration of cell tower antenna parameters is crucial for mitigating these radiation levels. This study therefore aims at systematically investigating the influence of different cell tower antenna parameters on reducing the RF radiation levels from mobile base stations. Field measurements were conducted at two cell sites shared by multiple mobile operators. Electric field strengths were measured at …
Lean Manufacturing Practices In Tanzania: Exploring Awareness, Training And Capital Investment, Francis D. Sinkamba
Lean Manufacturing Practices In Tanzania: Exploring Awareness, Training And Capital Investment, Francis D. Sinkamba
Tanzania Journal of Engineering and Technology (TJET)
With the growing competition among industries in the world, manufacturing industries are now forced to adopt the Lean Manufacturing philosophy to improve their competitive abilities. The adoption of the philosophy is very low in developing countries such as Tanzania, as is demonstrated with 1% of publications and the lack of knowledge and capital for Lean Manufacturing implementation causes this. Furthermore, the contribution of the sector to the Gross Domestic Product in Tanzania is low and stands at 8.4%. The study wants to bridge the gap in training, capital and awareness of Lean Manufacturing in Tanzania. Survey and purposive sampling techniques …
Evaluation Of Business-Driven Reference Architecture For Big Data Analytics Implementation By Public Sector Organizations In Resource-Constrained Setting: A Case Study Of Uganda, Matendo Didas
Tanzania Journal of Engineering and Technology (TJET)
Big Data Analytics (BDA) is a new area at the nexus of agenda, public sector organizations, and government business. It may satisfy the growing need for trustworthy, cost-effective services in the public sector for better, more informed decision-making processes. BDA has been proposed on the planning schedules of several public sector organizations and the government. Therefore, from the previous work, using Uganda as a case study, specifically the Uganda Bureau of Statistics (UBOS), Ministry of Health (MoH), and Ministry of Education and Sports (MoES), this study aims to evaluate a designed Business-Driven Reference Architecture for Big Data Analytics Implementation (BRABDAI) …
Assessment Of The Factors Affecting The National Ict Broadband Backbone (Nictbb) Systems Restoration Time, Victoria Mahabi
Assessment Of The Factors Affecting The National Ict Broadband Backbone (Nictbb) Systems Restoration Time, Victoria Mahabi
Tanzania Journal of Engineering and Technology (TJET)
This study investigates the factors affecting the prolonged system restoration time when national ICT broadband backbone (NICTBB) services are affected by breakdown incidents. NICTBB is the government-owned backbone infrastructure constructed nationally by the Republic of Tanzania to increase the usage of ICT for equitable and sustainable socio-economic development and accelerate poverty reduction. This study utilised a mixture of exploratory and descriptive study approaches. The sample size determination was executed using purposing and simple random sampling, thus involving 289 respondents. The data reliability test was undertaken. It was followed by factor analysis, analysis of variances (ANOVA), linear regression analysis, and confirmed …
Modeling The Influence Of Internal Factors On Vehicular Mobility Performance, Aziz Mdimi
Modeling The Influence Of Internal Factors On Vehicular Mobility Performance, Aziz Mdimi
Tanzania Journal of Engineering and Technology (TJET)
Traffic mobility is significantly influenced by road conditions and the internal factors governing vehicular performance. Internal factors play a crucial role in vehicular mobility, influencing vehicles operate and performance. While existing vehicular mobility models primarily address external factors, external factors such as governor, engine, gear train and differential unit remain underexplored. This study formulates a comprehensive model to address this gap, focusing on the internal components that affect vehicular mobility. The proposed model employs both analytical and numerical methods to derive transfer functions for these subsystems using Matrix Laboratory (MATLAB), aiming to capture the dynamic behavior of vehicles under various …
Investigation Of Heavy Metal Composition And Associated Health Risks From Selected Groundwater Wells In Temeke, Dar-Es-Salaam, Justin M. Jeremiah
Investigation Of Heavy Metal Composition And Associated Health Risks From Selected Groundwater Wells In Temeke, Dar-Es-Salaam, Justin M. Jeremiah
Tanzania Journal of Engineering and Technology (TJET)
Water quality continues to be the challenge to residents in Dar es Salaam due to various anthropogenic activities in the city. This study was conducted to assess groundwater quality by determining concentrations of heavy metals. Both probability and Nonprobability sampling techniques were used to collect samples from 40 groundwater wells in 24 wards of Temeke municipal and analysed using Microwave Plasma Atomic Emission Spectrometer (Agilent 4210 MP-AES) at the Geochemistry Laboratory of the University of Dar es Salaam. Results indicated varying heavy metal concentrations ranging from 0.71 ± 0.08 to 6.64 ± 0.21 mg/l for As, 0.02 ± 0.01 to …
Assessment Of Web Security Vulnerabilities For Common Open Source Virtualization Software, Said Ally
Assessment Of Web Security Vulnerabilities For Common Open Source Virtualization Software, Said Ally
Tanzania Journal of Engineering and Technology (TJET)
Open-source hypervisors have emerged as an integral technology for virtualizing server resources in cloud and data center computing. Hypervisor security efficiency is determined by virtual machine isolation, which is a de facto adoption factor in the selection process, as well as its ability to respond to web attacks. This paper assesses the security performance of Proxmox VE and XenServer for type 1 hypervisors, and Kernel Virtual Machine and Oracle Virtual Box for type 2 hypervisors. Security analysis was conducted using common exposures extracted from vulnerability databases and mapped against the OWASP 2013 and 2017 projects. For clarity, experiments were carried …
Necessity Of Education For Efficient And Sustainable Production And Consumption Of Energy In Tanzania, George Kahangwa
Necessity Of Education For Efficient And Sustainable Production And Consumption Of Energy In Tanzania, George Kahangwa
Tanzania Journal of Engineering and Technology (TJET)
This paper reports the findings of a study that was conducted in Tanzania to grasp how the policies, plans and curricula at different levels of education accommodate knowledge gathered on energy to support the fostering of energy education. The study interrogated what necessitates the inclusion of energy education into the curricula in Tanzania. Subscribing to a qualitative approach, the study employed a desk research method to review curricula and other documents guiding secondary and university level education in the country. The study found out that heightening people’s consumption of energy for domestic and industrial purposes constituted the main issue that …
Assessing The Importance Of Air-Decking Blasting In Controlling Bigv At An Open Pit Gold Mine In Tanzania Using Ann Model, Karim R. Baruti
Assessing The Importance Of Air-Decking Blasting In Controlling Bigv At An Open Pit Gold Mine In Tanzania Using Ann Model, Karim R. Baruti
Tanzania Journal of Engineering and Technology (TJET)
Air-decking blasting technique is used to control blast induced ground vibration (BIGV) in several mines including open-pit gold mines located in Tanzania. While the importance of air-deck to control BIGV is practically evident, theoretical models such as BIGV prediction models cannot be used to assess the importance of air-decking. The main objective of this study was to assess the importance of the air-decking blasting technique to control BIGV using the artificial neural network (ANN)Model. To achieve this objective, ANNs were modeled and trained to learn the pattern of data using Multilayer Perception with Back Propagation to predict BIGV. The main …
Perona-Malik Diffusion-Driven Regularization For Image Resolution Enhancement In Electrical Capacitance Tomography, Nassor Ally
Perona-Malik Diffusion-Driven Regularization For Image Resolution Enhancement In Electrical Capacitance Tomography, Nassor Ally
Tanzania Journal of Engineering and Technology (TJET)
Electrical Capacitance Tomography (ECT) is a non-invasive promising method for monitoring industrial processes, such as oil-gas flow in pipelines and solid-gas flow in pneumatic systems. Despite its potential benefits, ECT generates poor-quality images, often used only for qualitative analysis. A non-linear relationship between measured capacitances and permittivity distribution and the ill-posedness of the sensitivity matrix elements causes this limitation. This hinders the applicability of ECT in monitoring online industrial process applications. This work proposes a reconstruction method based on a nonlinear diffusion function to generate high-quality images from the measured capacitance data from the ECT system. The diffusion regularization functional …
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 …