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Articles 391 - 420 of 952
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Probabilistic Seismic Hazard Assessment And Site Analyses Of Arusha International Conference Centre (Aicc), Arusha, Tanzania, Richard W Ferdinand
Probabilistic Seismic Hazard Assessment And Site Analyses Of Arusha International Conference Centre (Aicc), Arusha, Tanzania, Richard W Ferdinand
Tanzania Journal of Science
This work presents the evaluation of earthquake resistance of the Arusha International Conference Centre (AICC) complex, in Tanzania. The evaluation included probabilistic seismic hazard analysis (PSHA) and site response analysis. Seismic sources considered to constitute a seismic hazard in this study were randomly occurring seismicity located within five tectonic provinces around the site. For each province the seismic hazard is based on a cursory analysis of earthquake data from compiled ESARSWG bulletins and temporary deployed networks within the North Tanzania Divergence (NTD). Bedrock response signal together with the information of material characteristics from boreholes around the AICC site were used …
Integration Of Geophysics And Remote Sensing Techniques In Mapping Zones Mineralised With Disseminated Gold And Sulphide Minerals In Lolgorien, Narok County, Kenya, Sammy O Ombiro, Akinade S Olatunji, Eliud M Mathu, Taiwo R Ajayi
Integration Of Geophysics And Remote Sensing Techniques In Mapping Zones Mineralised With Disseminated Gold And Sulphide Minerals In Lolgorien, Narok County, Kenya, Sammy O Ombiro, Akinade S Olatunji, Eliud M Mathu, Taiwo R Ajayi
Tanzania Journal of Science
Even though ground geophysical surveys (especially Induced polarization and resistivity) are applied in mineral exploration, their effectiveness in identification of mineralised zones is often enhanced by integrating other mineral exploration techniques such as remote sensing and geological investigations. Integrating different techniques helps in reducing uncertainty that is often associated with mineral exploration. The methods being integrated also depend on characteristics of mineralisation and those of host rock. In this study, geophysical survey methods (induced polarization and resistivity) were integrated with remote sensing and geological methods to delineate mineralised zones in Lolgorien beyond reasonable doubt. By integrating these methods, it was …
Probabilistic Seismic Hazard Analysis For Northern Tanzania Divergence Region And The Adjoining Areas, Michael M Msabi, Richard W Ferdinand
Probabilistic Seismic Hazard Analysis For Northern Tanzania Divergence Region And The Adjoining Areas, Michael M Msabi, Richard W Ferdinand
Tanzania Journal of Science
This paper presents the seismic hazard levels for the Northern Tanzania Divergence (NTD) and adjoining areas by using area seismic source zones. The 15 source zones were considered based on the major geological and tectonic features, faulting style, and seismicity trends. For each source, earthquake recurrence parameters were computed by using the earthquake catalogue with events compiled from 1956 to 2011. The peak ground accelerations (PGA) and spectral accelerations (SA) at 0.2 and 2.0 second, respectively, were computed for a 10% probability of exceedance in 50 years at sites defined by a 0.1° x 0.1° grid. The recurrence parameters of …
Analysis And Comparison Of Optical Performance And Collectible Solar Energy Between Multi-Sectioned Compound Parabolic Concentrator (Cpc) And Restricted Exit Angle Cpc, Damasen Ikwaba Paul
Analysis And Comparison Of Optical Performance And Collectible Solar Energy Between Multi-Sectioned Compound Parabolic Concentrator (Cpc) And Restricted Exit Angle Cpc, Damasen Ikwaba Paul
Tanzania Journal of Science
This study was conducted to analyse and compare the optical performance and collectible solar radiation energy of two different Compound Parabolic Concentrators (CPCs): multi-sectioned CPC (hereafter called M-CPC) and restricted exit angle CPC (hereafter called R-CPC) so as to ascertain the best CPC for photovoltaics applications. For easy comparison between M-CPC and R-CPC, a standard CPC (hereafter called S-CPC) was also designed. A detailed ray trace simulation analysis was undertaken to compare ray trace diagrams, angular acceptance, optical efficiency and energy flux distribution of the three CPCs. Results indicated that the angular acceptance and optical efficiency of the three CPCs …
Mineralogical And Geochemical Characteristics Of Graphite-Bearing Rocks At Chenjere Area, South-Eastern Tanzania: Implications For The Nature And Quality Of Graphite Mineralization, Charles D Moye, Michael M Msabi
Mineralogical And Geochemical Characteristics Of Graphite-Bearing Rocks At Chenjere Area, South-Eastern Tanzania: Implications For The Nature And Quality Of Graphite Mineralization, Charles D Moye, Michael M Msabi
Tanzania Journal of Science
This study focused on the mineralogical and geochemical characteristics of graphite-bearing rocks at Chenjere area by conducting surface geological mapping, geochemical and petrographical analyses with the intention of characterizing the nature of graphite occurrence in these lithological units. This paper presents results of the flake size, grade and mineralization extension of graphite in the graphitic gneiss. Field observations, petrographic investigation and comparison with other studies indicate that graphite occurrence at the Chenjere area is of sedimentary origin which fall under syngenetic type. The petrographic study revealed that nature of metamorphism of rocks in the Chenjere area is of high grade …
Geological Controls On Brine Discharge In Itumbula Salt Dam Within The Rukwa Rift In Momba District, Tanzania, Mwita S Maswi, Octavian Minja, Chakutema Batwenge
Geological Controls On Brine Discharge In Itumbula Salt Dam Within The Rukwa Rift In Momba District, Tanzania, Mwita S Maswi, Octavian Minja, Chakutema Batwenge
Tanzania Journal of Science
The Itumbula salt dam of the Rukwa Rift Basin is a depression formed through extraction of spring-derived salt crystals. Brine yield by springs which is the primary cause of significant amounts of salt in the dam required further geological investigations to understand yield controls. In this study, detailed field geological investigations in the salt dam and its surroundings were conducted to ascertain brine discharge controls. These included documentation of lithology and surface manifestations of brine deposition. Geophysical methods (i.e. magnetic and electric surveys) for studying geologic structures associated with brine deposits, and laboratory analysis of cations and anions (e.g. chlorides, …
Assessment Of Natural Radioactivity And Radiation Hazards Of Building Materials In Kinondoni District, Dar Es Salaam, Tanzania, Huruma P Mammba, Vitus A Balobegwa, Alex P Muhulo, Peter A Pantaleo, Remigius A Kawala
Assessment Of Natural Radioactivity And Radiation Hazards Of Building Materials In Kinondoni District, Dar Es Salaam, Tanzania, Huruma P Mammba, Vitus A Balobegwa, Alex P Muhulo, Peter A Pantaleo, Remigius A Kawala
Tanzania Journal of Science
Natural radionuclides from building materials are one of the potential sources of external as well as internal radiation exposure to the human body. Currently, this exposure has been increasing since people spend more than of their time indoors (ICRP 1991). Commonly used building materials from Kinondoni District were investigated using γ-spectrometry; their activity concentrations of 226Ra, 232Th and 40K in Bq/kg were measured. The results showed that average values of activity concentrations of 226Ra, 232Th and 40K were 15.62, 21.51 and 237.99 Bq/kg, respectively. All the activity concentrations in the studied samples were lower than the world average values of …
Evaluation Of Scatter Suppression Algorithm For X-Ray Exposure Of Soft Tissue Equivalent Phantoms Over Nominal Energy Range Using Fluka Code, Samson O Omondi, Innocent J Lugendo, Ramadhan R Kazema, Robert Kinyua
Evaluation Of Scatter Suppression Algorithm For X-Ray Exposure Of Soft Tissue Equivalent Phantoms Over Nominal Energy Range Using Fluka Code, Samson O Omondi, Innocent J Lugendo, Ramadhan R Kazema, Robert Kinyua
Tanzania Journal of Science
Soft tissue imaging is heavily impaired by streaks and cupping effects associated with X-ray scatter. Quality of images from projection imaging may be improved by the use of enhanced anti-scatter grids’ designs with potency to reject significant scatter. However, optimization of grid characteristics requires investigation to improve diagnostic image quality. Transmitted scatter spatially distributed degrades images engendering need for effective scatter correction protocols. This study investigated the pre-scan scatter suppression algorithm for X-ray exposure of soft tissue equivalent phantoms over nominal energy range. Adipose tissue and polymethyl methacrylate phantoms of cross-sectional area (30 x 30) cm2 and of varying thickness …
Biodiesel Production By Esterification Of Ricinoleic Acid Over A Series Of Synthesized Sulfated Zirconia Catalysts, Elianaso Elimbinzi, Stephen S Nyandoro
Biodiesel Production By Esterification Of Ricinoleic Acid Over A Series Of Synthesized Sulfated Zirconia Catalysts, Elianaso Elimbinzi, Stephen S Nyandoro
Tanzania Journal of Science
A series of sulfated zirconia (SZ) were synthesized and evaluated for catalytic esterification of ricinoleic acid obtained from the castor oil with butanol at 110 °C. The effect of alcohols’ chain length was studied using butanol (C4), propanol (C3), ethanol (C2) and methanol (C1) at 65 °C, and reflux of corresponding alcohol boiling points. The synthesized catalysts were characterized using nitrogen porosimetry, X-ray powder diffraction, thermogravimetric analysis and Diffuse Reflectance Infrared Fourier Transform Spectroscopy. Analysis of ricinoleic conversion was performed using gas chromatography. Sulfuric acid loading improved the surface area of zirconia at a lower dose. The surface areas of …
Variations In The Effects Caused By Magnetic Field On Chlorophyll, Nitrogen, Calcium, And Iron Contents In Species Of Vegetable Plants, Olusegun O. Alabi, Samuel O. Sedara, Kafayat Adeyemi, Felix Oladejo, Funmilayo Ayedun
Variations In The Effects Caused By Magnetic Field On Chlorophyll, Nitrogen, Calcium, And Iron Contents In Species Of Vegetable Plants, Olusegun O. Alabi, Samuel O. Sedara, Kafayat Adeyemi, Felix Oladejo, Funmilayo Ayedun
Tanzania Journal of Science
The rates of reduction in chlorophyll and nutrients such as nitrogen, calcium and iron with the distance or range of source of Magnetic Field (MF) had not been considered. In this work, patterns of damage or reduction caused by a magnetic field on two different species of vegetables were studied. The first group was planted in an environment without the influence of MF, while the second group was subjected to high MF under the 330 kV electric lines. The magnetometer was used to measure the MF intensities. The chlorophyll content of each vegetable sample was determined on the field with …
Count Time Series Models For Road Traffic Accidents In Tanzania Mainland, Amina S Msengwa, Florence D Ngari
Count Time Series Models For Road Traffic Accidents In Tanzania Mainland, Amina S Msengwa, Florence D Ngari
Tanzania Journal of Science
A pairwise analysis was conducted to assess the trends and factors associated with road traffic accidents in Tanzania. The Poisson and Negative Binomial Autoregressive Models were used to extend log linear functions by accounting time-varying components. A total of 85,514 road traffic accidents in Tanzania mainland that occurred from 2012 to 2017 were extracted from Tanzania Police Office records. Eleven factors were grouped into a human, vehicle, physical/environmental and pedestrian-related factors. The Likelihood ratio test, Akaike Information Criterion, Bayesian Information Criterion and residual ACF plots were used to evaluate the performance of the models in Dar es Salaam and other …
Hydrogeophysical Investigation For The Aquifers In Part Of Ilorin, Central Nigeria: Implication On Groundwater Prospect, Ayodele Kehinde Olawuyi
Hydrogeophysical Investigation For The Aquifers In Part Of Ilorin, Central Nigeria: Implication On Groundwater Prospect, Ayodele Kehinde Olawuyi
Tanzania Journal of Science
Hydrogeophysical study involving the use of Vertical Electrical Sounding (VES) was carried out in part of the basement complex rocks of Ilorin, central Nigeria, with the aim of determining its geoelectric parameters and groundwater potential. A total of thirty (30) VES were carried out using Schlumberger electrode configuration, with half electrode separation (AB/2) varying from 1m to 100m. Information on the subsurface lithologies, overburden thickness and aquiferous layers were obtained from the different VES locations in the study area. From the quantitative interpretations of the data collected, using the method of curve matching with the Orellana-Mooney master curves and 1-D …
Evaluation Of Petroleum Hydrocarbons Contamination In Soils And Groundwater Using Electrical Resistivity And Hydrochemical Methods-Case Study: Ayetoro, Osogbo Southwestern Nigeria, Mutiu A Fakunle, Muhydeen A Ibraheem, Wasiu B Agbaje, Luqman A Abidoye
Evaluation Of Petroleum Hydrocarbons Contamination In Soils And Groundwater Using Electrical Resistivity And Hydrochemical Methods-Case Study: Ayetoro, Osogbo Southwestern Nigeria, Mutiu A Fakunle, Muhydeen A Ibraheem, Wasiu B Agbaje, Luqman A Abidoye
Tanzania Journal of Science
The presence of Petroleum Hydrocarbons (PHCs) in hand-dug wells has become a concern to the residents of Ayetoro area, Osogbo. Consequently, the detection of PHCs was evaluated using, nine Vertical Electrical Soundings (VES) and 2D electrical resistivity tomography surveys. Soil samples collected were analyzed for porosity and permeability. Hand-dug well water samples were screened for PHCs. VES revealed that second layer had high apparent resistivity of 14415.0 Ωm, indicating presence of PHCs that had penetrated to maximum depth of 19.1 m. The highest resistivity of the control points was 48.0 Ωm, indicating absence of PHCs. The 2D resistivity revealed highest …
Synergistic Effects Of Halide Ions And Acacia Senegal Gum On The Corrosion Inhibition Of Mild Steel In Sulfuric Acid Solution, Jovine Emmanuel, Joseph Buchweishaija
Synergistic Effects Of Halide Ions And Acacia Senegal Gum On The Corrosion Inhibition Of Mild Steel In Sulfuric Acid Solution, Jovine Emmanuel, Joseph Buchweishaija
Tanzania Journal of Science
The synergistic effects of halide ions, Br– and I– and Acacia senegal gum exudates on the corrosion inhibition of mild steel in 0.5 M sulfuric acid solution has been investigated by potentiodynamic polarization measurements and electrochemical impedance spectroscopy techniques. Results showed that Acacia senegal gum exudate moderately reduces the corrosion rate of mild steel. The inhibition efficiencies on mild steel electrodes increased with increase in gum exudate concentrations up to 300 ppm, corresponding to the inhibition efficiency of about 43% and its inhibition efficiency increased up to 81.6% with addition of halide ions due to synergistic effects. The enhancement effect …
Perceived Risk Factors Of Dysmenorrhea Among Female Undergraduates In University Of Ilorin, Ilorin, Nigeria, Ibrahim Ologele, Precious Daniel Oyiza, Ogunsola Tijani
Perceived Risk Factors Of Dysmenorrhea Among Female Undergraduates In University Of Ilorin, Ilorin, Nigeria, Ibrahim Ologele, Precious Daniel Oyiza, Ogunsola Tijani
Tanzania Journal of Science
Dysmenorrrhea is one of the leading causes of school absenteeism among female undergraduates in University of Ilorin, Nigeria. Therefore, the study investigated the perceived risk factors of dysmenorrhea among female undergraduates in the University of Ilorin, Nigeria. Descriptive research design of survey type was used for the study. Population for this study comprised of female undergraduates in the University of Ilorin for 2018/2019 academic session. Multi-stage sampling technique of simple, proportionate, purposive and convenience sampling techniques were used to select 263 respondents that participated in the study. The researcher developed a questionnaire which was validated by 3 experts from the …
Influence Of Covid-19 On The Psychological Wellbeing Of Tertiary Institution Students In Nigeria, Seun Akorede, Ayodotun Ajayi, Atanda Toyin, Gilbert Uwadia
Influence Of Covid-19 On The Psychological Wellbeing Of Tertiary Institution Students In Nigeria, Seun Akorede, Ayodotun Ajayi, Atanda Toyin, Gilbert Uwadia
Tanzania Journal of Science
The outbreak of COVID-19 has led to a global lockdown, pending the time medical researchers find a vaccine for the coronavirus. This study examined if loneliness, depression and stress are influences of COVID-19 on the psychological wellbeing of tertiary institutions students in Nigeria. A descriptive research design of survey type was employed for this study. The population comprised all students of tertiary institutions in Nigeria totaling about 4,406,000. One hundred and thirty-seven (137) respondents were sampled for the study. A validated researcher developed questionnaire tested for reliability was used for the study. The data collected were analyzed using descriptive statistics. …
Determination Of Aquifer Parameters From Resistivity Data: A Case Of University Of Ilorin Campus, Northcentral Nigeria, Babatunde Onawola, Saminu Olatunji, Oluwatoyin Ologe, Razak Jimoh
Determination Of Aquifer Parameters From Resistivity Data: A Case Of University Of Ilorin Campus, Northcentral Nigeria, Babatunde Onawola, Saminu Olatunji, Oluwatoyin Ologe, Razak Jimoh
Tanzania Journal of Science
A total of twenty-one (21) vertical electrical sounding (VES) data were acquired using Pz-02 resistivity meter within the Precambrian basement area of part of Ilorin Metropolis north central Nigeria to evaluate the hydraulic characteristics of aquifers. The Schlumberger configuration with half-current electrode separation (AB/2) varying from 1 m to 60 m was used. The aquifer hydraulic characteristics such as hydraulic conductivity K and transmissivity T (Ωm2) were calculated from the interpreted VES data using the concept of Dar-Zarrouk parameters. The data, processed with computer software IPI2WIN, indicated three to four geo-electric layers, namely; topsoil, clayey (wet to dry), weathered or …
Forest Structure And Climate Change Mitigation Potential: A Case Of Wilolesi And Ikonongo Forested Hills In Iringa Municipality, Tanzania, Evarist Fundisha, Hamidu Seki, Anasia Saria
Forest Structure And Climate Change Mitigation Potential: A Case Of Wilolesi And Ikonongo Forested Hills In Iringa Municipality, Tanzania, Evarist Fundisha, Hamidu Seki, Anasia Saria
Tanzania Journal of Science
Vegetation plays major roles in carbon storage and ecosystem functioning by modifying the rate of carbon fluxes thereby mitigating climate change. However, the focus of assessing the potentials for different vegetation on climate change mitigation has for so long been conducted outside cities, towns and municipalities. This study was conducted in Wilolesi and Ikonongo hills located in Iringa as representative of the Municipality forested hills in Tanzania to assess vegetation structure and their potential for climate change mitigation. Random sampling technique was employed to establish 20 rectangular plots of 20 m x 40 m (0.08 ha) in each hill to …
Seismic Attributes Analysis As A Precursor To Hydrocarbon Indicators: A Case Study Of “Ok” Field, Niger Delta, Oluwatoyin Ologe, Mary Olowokere
Seismic Attributes Analysis As A Precursor To Hydrocarbon Indicators: A Case Study Of “Ok” Field, Niger Delta, Oluwatoyin Ologe, Mary Olowokere
Tanzania Journal of Science
Seismic data volume was employed to gain more insights into the complexities of the hydrocarbon hosting units within and outside the vicinity of well control in the OK-field Niger Delta to overcome wrong deductions from complexly faulted subsurface configuration for the oilfield exploration programme. The methodology involved integration of well log with seismic data, seismic structural analysis and seismic attributes analysis. Horizons and fault interpretations were carried out to produce subsurface attribute maps. Lithologic panels derived from well log data showed that the study area is characterized by sand-shale interbedding. Two hydrocarbon bearing reservoirs were delineated within the study interval, …
Hiv/Aids Transmission Dynamics: Modelling The Roles Of Long Distance Truck Drivers, Nyimvua Mbare
Hiv/Aids Transmission Dynamics: Modelling The Roles Of Long Distance Truck Drivers, Nyimvua Mbare
Tanzania Journal of Science
A mathematical model to investigate the roles of long distance truck drivers on HIV transmission dynamics was formulated and analyzed to establish the existence of disease free and endemic equilibrium points. The results show that, the disease free equilibrium point is asymptotically stable when the basic reproduction number is less than unity and unstable otherwise. Furthermore, comprehensive analyses on the two steady states (infection free and endemic) have shown that they are both globally and asymptotically stable. Sensitivity analysis is performed on the reproduction number in order to establish the relative importance of parameters, and it shows that the truck …
Analyzing The Electricity Consumption And Costs Of Electrical-Powered Machines When There Is Orepass Failure In Underground Mine, Bartłomiej Skawina, Abubakary Salama
Analyzing The Electricity Consumption And Costs Of Electrical-Powered Machines When There Is Orepass Failure In Underground Mine, Bartłomiej Skawina, Abubakary Salama
Tanzania Journal of Science
In underground mining environment where the loss of orepasses is a dominant factor, the mine may face a challenge of improving the loading and hauling operations. Some of the options will be to rehabilitate the lost orepasses, or developing the new ones. When the rehabilitation cost is high, alternative strategies should be applied to compensate for the orepasses failure. One of the possible options is to use diesel or electric Load-Haul-Dumps (LHDs). The use of diesel-powered LHDs will increase heat and gas emissions which increase environmental concerns and ventilation costs, while adoption of electric-powered vehicles needs to be analysed. Therefore, …
Modelling Road Traffic Accidents Counts In Tanzania: A Poisson Regression Approach, Thadei Sagamiko, Nyimvua Mbare
Modelling Road Traffic Accidents Counts In Tanzania: A Poisson Regression Approach, Thadei Sagamiko, Nyimvua Mbare
Tanzania Journal of Science
Road traffic accidents have become serious threats to Tanzanians in recent years. The outcryemanates from the increasing prevalence of negative effects of accidents on human lives,properties, environments and the economy. Poisson regression model was used to study therelationship between road accidents and the factors facilitating them in Tanzania. Count data onyearly road traffic accidents for Tanzania covering the period 1993 to 2019 were used. Due toover-dispersion of Poisson regression model, quasi-Poisson regression model was found the mostappropriate approach for the analysis of these data. Results indicated that all predictors aresignificant under Poisson regression model with p-value less than 0.05 but …
Campylobacteriosis Transmission Dynamics In Humans: Modeling The Effects Of Public Health Education, Treatment, And Sanitation, Furaha Chuma, Zubeda Mussa
Campylobacteriosis Transmission Dynamics In Humans: Modeling The Effects Of Public Health Education, Treatment, And Sanitation, Furaha Chuma, Zubeda Mussa
Tanzania Journal of Science
An epidemic model for the dynamics of campylobacteriosis disease with public health education, treatment, and sanitation control strategies was formulated and analyzed. The stabilities of the equilibrium points were analyzed by using the Routh-Hurwitz criterion. The effective reproduction number was computed by using the Next Generation Matrix method. Numerical simulations were carried out and the results showed that, public health education has a substantial influence on the reduction of the effective reproduction number. Moreover, treatment and sanitation control strategies have also shown significant reduction of infected individuals from the respective population.Keywords: Campylobacteriosis; public health education; treatment; sanitation.
Physicochemical And Sensory Evaluation Of Mixed Juices From Banana, Pineapple And Passion Fruits During Storage, Victor Matabura, Oscar Kibazohi
Physicochemical And Sensory Evaluation Of Mixed Juices From Banana, Pineapple And Passion Fruits During Storage, Victor Matabura, Oscar Kibazohi
Tanzania Journal of Science
Juices from fresh fruits offer various health benefits, including strengthening the immune system and preventing diseases. Mixed fruit juices tend to have good nutritional contents and organoleptic properties like colour, flavour, taste, and overall appeal of different fruits. This work investigated the physicochemical and sensory attributes of fruit juice of low viscosity banana juice blended with pineapple and passion juices. The prepared juices were pasteurised at 92 °C for 15 s, bottled in air-tight glass bottles, and subsequently stored in two different conditions: an ambient temperature of approximately 28 ± 2 °C and a fridge at 4 ºC for one …
Corrosion Inhibition Of Mild Steel In Seawater By 2,4,6-Triamino-3-Pentadecylphenyl Acetate Derived From Cashew Nut Shell Liquid, Emanuel Ricky, Esther Lugwisha, Joseph Philip
Corrosion Inhibition Of Mild Steel In Seawater By 2,4,6-Triamino-3-Pentadecylphenyl Acetate Derived From Cashew Nut Shell Liquid, Emanuel Ricky, Esther Lugwisha, Joseph Philip
Tanzania Journal of Science
The corrosion inhibition performance of 2,4,6-triamino-3-pentadecylphenyl acetate on mild steel in seawater at stationary condition, 30 °C and pH 8 was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy. The maximum inhibition efficiency of 93% was found in the presence of 300 ppm of 2,4,6-triamino-3-pentadecylphenyl acetate for both potentiodynamic polarization and electrochemical impedance spectroscopy techniques. The potentiodynamic polarization curves show that 2,4,6-triamino-3-pentadecylphenyl acetate acts as a mixed type inhibitor which influences more the anodic processes. The Nyquist plots revealed that the polarization resistance (Rp) increases whereas the double-layer capacitance (Cdl) and corrosion current density (icorr) decrease as the concentrations of …
Application Of Guided Local Search (Gls) In Portfolio Optimization, Collether John
Application Of Guided Local Search (Gls) In Portfolio Optimization, Collether John
Tanzania Journal of Science
Portfolio optimization is a major activity in any operating business. Conventional portfolio optimization research makes simplifying assumptions; for example, they assume no constraint in how many assets one holds (cardinality constraint). They also assume no minimum and maximum holding sizes (holding size constraint). Once these assumptions are relaxed, conventional methods become inapplicable, and hence new methods are needed to tackle this challenge. Threshold Accepting is an established algorithm in the extended portfolio optimization problem. In this paper, an algorithm called Guided Local Search (GLS) is applied using an accurate and efficient designed hill climbing algorithm, named HC-C-R. GLS sitting on …
Capacity Analysis Of A Television White Space Network Deployed Under Distance Distribution Approach, Moses Ismail, Mussa Kissaka, Prosper Mafole
Capacity Analysis Of A Television White Space Network Deployed Under Distance Distribution Approach, Moses Ismail, Mussa Kissaka, Prosper Mafole
Tanzania Journal of Science
Television White Space (TVWS) is currently a leading technology for broadband connectivity in rural areas due to its penetration capability and robustness to attenuation and fading. Since most rural areas where TVWS is suitable are characterized by sparse population distribution, a deployed network must be adequately planned to provide the required coverage while meeting the targeted quality of service. This paper modelled and analyzed the capacity of a TVWS suitable for sparsely populated settings. The TVWS network was modelled using the distance distribution approach, and capacity simulation was carried out through Matlab. Results showed that, at the signal quality of …
A Model For Mapping Combined Effects Of Quality Of Service Parameters And Device Features On Video Streaming Quality Of Experience, Beatrice Buberwa, Mercy Mbise
A Model For Mapping Combined Effects Of Quality Of Service Parameters And Device Features On Video Streaming Quality Of Experience, Beatrice Buberwa, Mercy Mbise
Tanzania Journal of Science
Maintaining quality of streaming video is challenged by network faults resulting into freezes and rebufferings on the video. On top of the network effects, device features have impacts on the image of the video frames displayed during streaming. Despite the simultaneous impacts of video quality from network and device, previous studies considered individual impact of network parameters or devices as influencing factors to propose Quality of Experience (QoE) models. This study proposed QoE model by mapping combined effects from both network and device on video streamed QoE. An experiment to study the effects of video quality from combined effects of …
Analysis Of A Reform Option For The Tanzanian Pension System, Andongwisye Mwakisisile, Torbjörn Larsson
Analysis Of A Reform Option For The Tanzanian Pension System, Andongwisye Mwakisisile, Torbjörn Larsson
Tanzania Journal of Science
In this study, an analysis of a reform option for the Tanzanian pension system was done. The current system is dominated by mandatory defined benefit operating under pay-as-you-go principles. The retirement benefits are based on the average of the three best final salaries in the ten years preceding retirement. Several studies and international experts have shown that such systems face unsustainability. We propose a reform to a notional defined contribution system in which the benefits depend on accumulated contributions indexed by internal rates of returns. Simulation of results for a time horizon of fifty years shows that the notional defined …
Analysis Of Repeated Milk Yields And Composition Traits By Mixed Models For Crossbred Holstein Friesian Dairy Cows, Ewonetu Senbeta, Kefelegn Kefenie, Adane Abebe
Analysis Of Repeated Milk Yields And Composition Traits By Mixed Models For Crossbred Holstein Friesian Dairy Cows, Ewonetu Senbeta, Kefelegn Kefenie, Adane Abebe
Tanzania Journal of Science
This study evaluated the effects of milking month, milking time, and lactation stage on milk yield and composition traits of crossbred dairy cows. Twelve crossbred Holstein Friesian cows with the same parity were purposefully selected and categorized into three groups; each consisting of four. All cows were individually managed for 120 days. Milk yield record was done every day for the morning and evening time whereas milk samples were taken every fifteen-day intervals. Data collected were analysed by PROC MIXED procedure of SAS 9.4. The “morning milkings” in all milking months showed the highest variations for “milk yield” whereas the …