Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (18)
- Materials Science and Engineering (13)
- Earth Sciences (11)
- Geology (11)
- Life Sciences (10)
-
- Chemistry (9)
- Atmospheric Sciences (7)
- Oceanography and Atmospheric Sciences and Meteorology (7)
- Biology (6)
- Environmental Sciences (6)
- Nuclear (5)
- Electrical and Computer Engineering (4)
- Medicine and Health Sciences (4)
- Computer Sciences (3)
- Condensed Matter Physics (3)
- Food Science (3)
- Other Physics (2)
- Analytical, Diagnostic and Therapeutic Techniques and Equipment (1)
- Applied Mathematics (1)
- Astrophysics and Astronomy (1)
- Biological and Chemical Physics (1)
- Biomedical Engineering and Bioengineering (1)
- Computational Chemistry (1)
- Data Science (1)
- Education (1)
- Elementary Particles and Fields and String Theory (1)
- Engineering Physics (1)
- Environmental Health and Protection (1)
- Institution
- Publication Year
- Publication
- Publication Type
Articles 61 - 90 of 126
Full-Text Articles in Physics
Evidence For A Record Of Possible Paleo-Tsunami Or Storm Deposits In The Fluviatile Neoproterozoic Malagarasi Supergroup Of North-Western Tanzania, Charles Kasanzu, Shukrani Manya
Evidence For A Record Of Possible Paleo-Tsunami Or Storm Deposits In The Fluviatile Neoproterozoic Malagarasi Supergroup Of North-Western Tanzania, Charles Kasanzu, Shukrani Manya
Tanzania Journal of Science
Two different localities within the fluviatile Neoproterozoic Malagarasi Supergroup of north-western Tanzania show striking evidence for tsunami related clastic sedimentary deposits. In each locality, the outcrops are characterised by the association of fine grained, thinly laminated shales at the bottom that are overlain by thick deposits of sandstones and conglomerates whose clasts and pebbles vary in size and angularity/roundness. In each case, the two rock units are separated by an erosional surface. The basal shale layers are consistent with deposition in deep shelf environments which are in stark contrast to the immediately overlying conglomerates/sandstones that suggest reworking under high energy …
Preparation And Characterization Of Zns Thin Films Grown By Spin Coating Technique, Oluwatoyin Osanyinlusi
Preparation And Characterization Of Zns Thin Films Grown By Spin Coating Technique, Oluwatoyin Osanyinlusi
Tanzania Journal of Science
Spin coating technique was used to deposit zinc sulphide (ZnS) thin films successfully onto glass substrates and the effects of the number of spin times on the optical properties investigated. The morphology and structures of the prepared thin films were also confirmed. X-ray diffraction confirmed that spin coated ZnS films exhibited cubic structure, where reflections from (111), (220) and (311) are clearly visible with a preferential orientation along (111) plane. The calculated crystallite size for 1S sample from the XRD data is 8.8 nm. From the optical studies, the thin films exhibit good optical properties with relatively high transmittance (81 …
Variations Of Concentrations Of Lead, Zinc, Iron, Copper And Cadmium In Urine Of Primary School Pupils In Relation To Age, Sex And Academic Performance, John Mahugija, Zainab Kasenya, Kessy Kilulya
Variations Of Concentrations Of Lead, Zinc, Iron, Copper And Cadmium In Urine Of Primary School Pupils In Relation To Age, Sex And Academic Performance, John Mahugija, Zainab Kasenya, Kessy Kilulya
Tanzania Journal of Science
This study was conducted in order to assess the variations and correlations in the concentrations of lead, zinc, iron, copper and cadmium metals in the urine samples of selected primary school pupils with respect to their sex, age and academic performance. Urine samples were collected from 240 pupils in Dar es Salaam, Tanzania and then digested in concentrated acids and analysed using atomic absorption spectrometry (AAS). Lead, zinc, iron and copper were detected in most of the urine samples. Cadmium was not detected in any of the samples. The mean concentrations of lead, zinc, iron and copper in the samples …
Characterization Of Magma Storage And Dynamics At Akutan, Semisopochnoi, And Okmok Volcanoes From Analytical And Numerical Models Of Geodetic, Seismic, And Petrologic Data, Kimberly Degrandpre
Characterization Of Magma Storage And Dynamics At Akutan, Semisopochnoi, And Okmok Volcanoes From Analytical And Numerical Models Of Geodetic, Seismic, And Petrologic Data, Kimberly Degrandpre
Earth Sciences Theses and Dissertations
Volcanic eruptions can cause significant socioeconomic loss, but a better understanding of the processes and dynamics influencing the evolution of volcanic plumbing systems will advance the development of eruption forecasting models that will ultimately mitigate hazards and risks associated with eruptive events. Geologic and geophysical data must be integrated in 3D, finite- element, multiphysical, numerical models to define the coupled evolution of magmatic and crustal stress regimes in volcanic environments, but in data limited regions this is not always an option. The remote nature of the Aleutian Island Arc restricts ground-based monitoring and sampling efforts, and due to sparse temporal …
Isodon Diterpenoids, Derivatives And Their Pharmacological Potentials-A Review, Monica M. Ndoile
Isodon Diterpenoids, Derivatives And Their Pharmacological Potentials-A Review, Monica M. Ndoile
Tanzania Journal of Science
The searches of various literatures have shown the genus Isodon to be a source of different compounds with interesting biological activities. The genus has provided many efficacious herbal medicines that are used in various countries including China; therefore, it has become the centre of attention to phytochemistry and pharmacology researchers. There are many reports on chemical and biological aspects of Isodon species, especially in China and other parts of the world; however, reports on African Isodon species are scanty. Since the literature indicates the genus to be rich in diterpenoids with potential therapeutic activities as revealed herein, with African species …
Monodisperse Polystyrene Microspheres: Studies On The Effects Of Reaction Parameters On Particle Diameter And Colloidal Stability, Ikhazuagbe H. Ifijen, Esther U. Ikhuoria
Monodisperse Polystyrene Microspheres: Studies On The Effects Of Reaction Parameters On Particle Diameter And Colloidal Stability, Ikhazuagbe H. Ifijen, Esther U. Ikhuoria
Tanzania Journal of Science
The synthesis of highly monodisperse polystyrene (PS) microspheres via surfactant-free emulsion polymerization process was successfully carried out. Various reaction conditions such as initiator amount, monomer amount, reaction temperature and stirring speed were varied with a view to studying the effects of these polymerization parameters on the particle diameter and colloidal stability of the synthesized PS microspheres. Microscopic analysis revealed that the as-synthesized particles are spherical in shape without any form of agglomeration. Thermo-gravimetric analyzer (TGA) analysis revealed that the prepared PS sample completely degrades at 465 °C. DLS analysis showed a reduction in the average particle diameters of the as-synthesized …
On Scalar Multiples Of Hypercyclic Operators On Non-Normable And Separable Fréchet Spaces, Melkiory M. Aloyce, Santosh Kumar, Marco Mpimbo
On Scalar Multiples Of Hypercyclic Operators On Non-Normable And Separable Fréchet Spaces, Melkiory M. Aloyce, Santosh Kumar, Marco Mpimbo
Tanzania Journal of Science
In this paper, we proved that if F is a non-normable and separable Fréchet space without a continuous norm, then there exists an operator T L (F) such that λ T is hypercyclic for any λ {0} of modulus 1 and has similar set of hypercyclic vectors as T. An illustrative example to the main theorem is also provided.
Generation Of Highly Ordered 3d Vivid Monochromatic Coloured Photonic Crystal Films Using Evaporative Induced Technique, Ikhazuagbe H. Ifijen, Esther U. Ikhuoria
Generation Of Highly Ordered 3d Vivid Monochromatic Coloured Photonic Crystal Films Using Evaporative Induced Technique, Ikhazuagbe H. Ifijen, Esther U. Ikhuoria
Tanzania Journal of Science
Structural coloured crystal films have attracted immense attention because of numerous applications like optical sensing, anti-counterfeiting and photonic fabrics. Herein, we successfully generated highly periodic three-dimensional (3D) monochromatic structural crystal films with brown, turquoise, blue and yellow colourations from as-synthesized poly(styrene-methyl methacrylate-acrylic acid) or P(St-MMA-AA) colloidal latex via the evaporative induced self-assembly technique. The colours were controlled through the modulation of their crystal lattice by varying their microspheres diameter from 180 nm, 120 nm, and 260 nm to 150 nm. Scanning electron microscope and atomic force microscope (SEM/AFM) analyses showed that the photonic crystal particles readily assembled into an impeccable …
Decision Rules For Supplier Selection Using Intuitionistic Fuzzy Topsis, Dickson Omorogbe, Sunday Omosigho
Decision Rules For Supplier Selection Using Intuitionistic Fuzzy Topsis, Dickson Omorogbe, Sunday Omosigho
Tanzania Journal of Science
This paper provides a methodology for addressing contradictions in the ranking of suppliers when more than one metric functions are adopted in intuitionistic fuzzy TOPSIS (Technique for Order Preference by Similarity to the Ideal Solution) for supplier selection. Our literature search revealed contradictions when more than one metric functions are adopted in the method. Two types of contradictions were addressed: (i) contradiction of the best supplier, and (ii) contradiction at the middle of the park. Decision rules algorithms were developed to address the problems.Worked examples were given to illustrate the rules for resolving the contradiction. A major thrust of this …
Densification Behaviour And Structural Properties Of Niobium And Lanthanum-Doped Lead Zirconate Titanate And Lead Barium Zirconate Ferroelectrics For Low-Donor Dopants Concentrations, David Bahati, Ismael Makundi
Densification Behaviour And Structural Properties Of Niobium And Lanthanum-Doped Lead Zirconate Titanate And Lead Barium Zirconate Ferroelectrics For Low-Donor Dopants Concentrations, David Bahati, Ismael Makundi
Tanzania Journal of Science
In this paper we report the densification behaviour and structural properties of niobium and lanthanum-doped lead zirconate titanate (PZT) and lead barium zirconate (PBZ) ferroelectrics for low additive concentrations (0–2%). The PZT materials were calcined at 800 °C and sintered at 1200 °C while the PBZ materials were calcined at 850 °C and sintered at 1250 °C. Densification behaviour revealed that materials with lanthanum or niobium additives of greater than 0.5% for PZT and 0.2% for PBZ achieved complete densification. A strong distortion was observed in lattice parameters for lower dopants in which PBZ doped materials showed higher lattice distortions …
Evaluation Of The Influence Of Additional Beam Filtration On Image Quality And Patient Dose In X-Ray Fluoroscopy Procedures, Justin Ngaile, Peter Msaki, Ramadhani Kazema, Jerome Mwimanzi, Mechris Mango
Evaluation Of The Influence Of Additional Beam Filtration On Image Quality And Patient Dose In X-Ray Fluoroscopy Procedures, Justin Ngaile, Peter Msaki, Ramadhani Kazema, Jerome Mwimanzi, Mechris Mango
Tanzania Journal of Science
The aim of the study was to evaluate the influence of additional filtration on radiation dose and image quality for patients during hysterosalpingography (HSG) and retrograde urethrography (RUG) procedures. The influence of filtering on image quality for each phantom thickness was made using a combination of different filter thicknesses. Entrance surface air kerma (ESAK) rates to Perspex phantom were measured using a solid state detector for various added combination of filter materials. Fluoroscopic image contrast was assessed using a Leeds TOR-18FG test object with a range of filter materials and phantom thicknesses. Phantom studies demonstrated that the use of additional …
Performance Of A Customized Cryo-Cooling System Designed For The Measurement Of The Lifetime Of Nuclear Excited States At Cryogenic Temperatures, Innocent J. Lugendo
Performance Of A Customized Cryo-Cooling System Designed For The Measurement Of The Lifetime Of Nuclear Excited States At Cryogenic Temperatures, Innocent J. Lugendo
Tanzania Journal of Science
Theoretical predictions that the lifetime of nuclear excited states can be varied if the nucleus is subjected to a condition that allows multiple coherent emission and re-absorption of gamma photons by the nucleus is of much interest to the nuclear physicists. Therefore, an experiment has been designed to study the possibility of lifetime variation. Based on the theory requirements, lifetime variations can be observed when the nucleus is cooled to cryogenic temperatures. Both the cryo-cooling system and the fast timing system have been developed. In the current work, the design, operation and performance of the developed cryo-cooling system is discussed. …
Construction Of A High Temperature (~ 200 °C) Oil Pump For Solar Thermal Energy Storage System For Cooking Applications, Jimmy Chaciga, Nyeinga Karidewa, Denis Okello, Benard Tabu
Construction Of A High Temperature (~ 200 °C) Oil Pump For Solar Thermal Energy Storage System For Cooking Applications, Jimmy Chaciga, Nyeinga Karidewa, Denis Okello, Benard Tabu
Tanzania Journal of Science
In this study, a positive displacement (PD) oil pump capable of operating at temperatures about 200 °C was constructed using locally available materials. The oil pump was tested to circulate pre-heated refined sunflower oil in Thermal Energy Storage (TES) tank comprising of an oil only and rock pebble-oil system and cooking application. The oil pump was constructed of harden steel and mild steel materials driven by AC/DC electric motor rated 8000 rpm. Standard gear teeth cutting tool was employed to produce the spurs and the pumps’ speed was varied using variable AC transformer connected to 220V AC main source. The …
Electrophoretic Deposition Of Tio2 Thin Films For Photocatalytic Degradation Of Organic Pollutants In Water, Francis W Nyongesa, Bernard O Aduda, Wilson G Nyaga
Electrophoretic Deposition Of Tio2 Thin Films For Photocatalytic Degradation Of Organic Pollutants In Water, Francis W Nyongesa, Bernard O Aduda, Wilson G Nyaga
Tanzania Journal of Science
In this study, electrophoretic deposition (EPD) technique was used to deposit titanium dioxide (TiO2) thin films on conducting glass substrates for application in photocatalytic degradation of organic pollutants in water. Phenol was used as a model pollutant. The EPD suspension related parameters and deposition conditions were first optimized for good quality film deposits. The suspension stability and deposition conditions that result in good adherence of TiO2 particles to the substrate with homogeneous film coatings are ethanol, a TiO2 solid loading of 4 wt%, a 0.2 wt% iodine concentration in the solvent and a deposition voltage of 20 V in a …
Effects Of Aluminium And Tungsten Co-Doping On The Optical Properties Of Vo2 Based Thin Films, Cephas J Lyobha, Nuru R Mlyuka, Margaret E Samiji
Effects Of Aluminium And Tungsten Co-Doping On The Optical Properties Of Vo2 Based Thin Films, Cephas J Lyobha, Nuru R Mlyuka, Margaret E Samiji
Tanzania Journal of Science
Aluminium and tungsten co-doped vanadium dioxide (VO2:W:Al) thin films were deposited by DC reactive magnetron sputtering technique. In this work we report on the effects of aluminium and tungsten co–doping on the optical properties of vanadium dioxide (VO2) based thin films with a view of combining both increased luminous transmittance (Tlum) and lowered transition temperature (τc). The effect of aluminium and tungsten co-doping on semiconductor-metal transition of vanadium dioxide films was investigated and compared with tungsten doped and undopedVO2films. Spectral transmittances of the films were obtained using Shimadzu SolidSpec-3700 DUV UV-VIS-NIR spectrophotometer. The results revealed that the transmittance of tungsten …
Hall Effect Parameters Of Aluminium And Tungsten Co-Doped Vo2 Thin Films, Mohamed Mussa, Nuru R Mlyuka, Margaret E Samiji
Hall Effect Parameters Of Aluminium And Tungsten Co-Doped Vo2 Thin Films, Mohamed Mussa, Nuru R Mlyuka, Margaret E Samiji
Tanzania Journal of Science
The Hall Effect parameters of Al and W co-doped VO2 thin films were studied in order to explain the effect of co-doping on the electrical properties of thermochromic VO2 films. The carrier concentrations and conductivity of the films were found to increase with increase in temperature while carrier mobility decreased reaching a minimum around the transition temperature then slightly rose and became stable at high temperatures. Tungsten doped films displayed higher carrier concentrations and conductivity on both sides of the metal insulator transition and lower mobility compared to undoped and Al and W co-doped VO2 thin films.
Effects Of Selenized Dc Sputtered Precursor Stacking Orders On The Properties Of Cu2znsnse4 Absorber Layer For Thin Film Solar Cells, Hezekiah B Sawa, Margaret E Samiji, Nuru R Mlyuka
Effects Of Selenized Dc Sputtered Precursor Stacking Orders On The Properties Of Cu2znsnse4 Absorber Layer For Thin Film Solar Cells, Hezekiah B Sawa, Margaret E Samiji, Nuru R Mlyuka
Tanzania Journal of Science
This study investigated the effects of selenized DC sputtered precursor stacking orders on the structural, electrical and optical properties of copper zinc tin selenide (CZTSe) absorber layer for thin film solar cells. The precursors were deposited sequentially on the soda lime glass substrate at room temperature by DC magnetron sputtering. The precursors were selenized by annealing in an atmosphere containing selenium pellets and nitrogen gas. The structural, morphological, optical and electrical properties were respectively characterized using X-Ray Diffractometer (XRD), atomic force microscopy (AFM), UV/VIS/NIR lambda 9/19 spectrophotometer, Hall Effect measurement system (HMS 3000) and a four point probe system. CZTSe …
Optimization Of Zinc To Tin Ratio In A Sol Gel Precursor Solution On The Growth And Properties Of Annealed Czts Thin Films, Justine John Tibaijuka, Margaret E Samiji, Nuru R Mlyuka
Optimization Of Zinc To Tin Ratio In A Sol Gel Precursor Solution On The Growth And Properties Of Annealed Czts Thin Films, Justine John Tibaijuka, Margaret E Samiji, Nuru R Mlyuka
Tanzania Journal of Science
CZTS thin films were deposited by sol–gel spin coating method using precursor solutions prepared by dissolving copper acetate dihydrate, zinc acetate dihydrate, tin chloride and thiourea in methanol and monoethylamine then annealed in RTP furnace at 500 °C. Sol–gel precursor solutions were prepared with different Zn/Sn in a precursor solution and were annealed at different time intervals; and their effects on the optical and electrical properties of CZTS (Cu2ZnSnS4) films were investigated. The optical band-gap values were estimated to be between 1.30 and 1.88 eV while the absorption coefficients were in the range of 104 cm–1 in the visible region. …
Compositional And Thickness Effects On The Optical Properties Of Zinc–Doped Selenium–Antimony Thin Films, Austine A Mulama, Julius M Mwabora, Andrew O Oduor, Cosmas M Muiva
Compositional And Thickness Effects On The Optical Properties Of Zinc–Doped Selenium–Antimony Thin Films, Austine A Mulama, Julius M Mwabora, Andrew O Oduor, Cosmas M Muiva
Tanzania Journal of Science
Chalcogenide system of antimony (Sb)-selenium (Se)-zinc (Zn) system is a promising semiconductor for phase change memory devices due to its thermal stability and low power consumption. The study investigated the effect of film thickness and zinc content on the optical properties of thermally evaporated Sb10Se90-xZnx (x = 0, 5, 10 & 15 at. %) thin films. It was found that transmittance (T~ 85-40%) and optical band gap energy (Eopt ~ 1.60 eV – 1.22 eV) decreased but absorption coefficient (α~0.840–2.031 104 cm–1) increased with increase in zinc content. Furthermore, as the film thickness increased from 53 ± 5 nm to …
Effects Of Thickness Variation In The Multilayer Thin Film On The Performance Of Eta Solar Cell, Robinson J Musembi
Effects Of Thickness Variation In The Multilayer Thin Film On The Performance Of Eta Solar Cell, Robinson J Musembi
Tanzania Journal of Science
A highly structured eta solar cell of the type TiO2/In(OH)xSy/Pb(OH)xSy/PEDOT:PSS/Au with different layer thickness has been fabricated using various deposition techniques for each layer in the stack. The solar cell parameters, Uoc, FF and have been extracted from current- voltage characteristics measurements. The buffer layer and the hole collector layer have been kept constant while the window and the absorber layer have been varied. The thickness of either of the two layers being varied has been observed to affect the performance of the solar cells. The difference in thickness has been attributed to affect the charge lifetime in the space …
Thermal Performance Of Selected Oils In Uganda For Indirect Solar Domestic Cooking Applications, Benard Tabu, Karidewa Nyeinga, Jimmy Chaciga, Denis Okello
Thermal Performance Of Selected Oils In Uganda For Indirect Solar Domestic Cooking Applications, Benard Tabu, Karidewa Nyeinga, Jimmy Chaciga, Denis Okello
Tanzania Journal of Science
This study experimentally evaluated the thermal performance of selected oils in Uganda for indirect solar domestic cooking applications. The oil samples used were refined sunflower oil, refined palm oil and thermia B. These oils are locally available in Uganda. Thermal stratification, energy and exergy analysis were performed for each oil to determine their suitability for Thermal Energy Storage (TES) using a thermosiphon principle. The results showed that thermal stratification of refined sunflower oil was higher as compared to refined palm oil and thermia B during the first one hour. The stored energy and exergy for refined sunflower oil was generally …
Effects Of Substrate Radial-Position Relative To The Sputter-Gun Axis On The Electrical, Optical And Structural Properties Of Zno Thin Films Deposited By Reactive Direct Current Magnetron Sputtering, John Paul Eneku, Tom Otiti, Julius Mwakondo Mwabora, David Horwat
Effects Of Substrate Radial-Position Relative To The Sputter-Gun Axis On The Electrical, Optical And Structural Properties Of Zno Thin Films Deposited By Reactive Direct Current Magnetron Sputtering, John Paul Eneku, Tom Otiti, Julius Mwakondo Mwabora, David Horwat
Tanzania Journal of Science
ZnO thin films were deposited using reactive direct current (dc) magnetron sputtering on glass substrates placed at seven variable radial positions (-1, 0, 1, 2, 3, 4 and 5 cm) relative to the sputter-gun (target) axis. A pure zinc target was used and sputtering carried out in argon and oxygen atmosphere with flow rates of 50 sccm and 6 sccm, respectively. XRD characterization showed that, all films crystallized homogeneously in the wurtzite phase with a strong (002) and a weak (004) orientations. Film crystallinity was very low at substrate positions located less than or equal to 1 cm from the …
Indirect Imaging Using Computational Imaging Techniques, Aparna Viswanath
Indirect Imaging Using Computational Imaging Techniques, Aparna Viswanath
Electrical Engineering Theses and Dissertations
The work describes various methods employed towards solving the problem of indirect imaging. Computational techniques are employed to indirectly decipher information about an object hidden from view of a camera. Notion of virtualizing the source of illumination and detectors on real world rough surfaces was exploited to construct a non line of sight computational imager. Diversity was explored from the stand point of both illumination of the object and imaging of light reflected from the object. To understand the impact of scattering by real world rough surfaces, an instrument was developed that allows characterization of isoplanatic angle for different surface …
A Trans Influence And Π-Conjugation Effects On Ligand Substitution Reactions Of Pt(Ii) Complexes With Tridentate Pendant N/S-Donor Ligands, Grace A. Kinunda
A Trans Influence And Π-Conjugation Effects On Ligand Substitution Reactions Of Pt(Ii) Complexes With Tridentate Pendant N/S-Donor Ligands, Grace A. Kinunda
Tanzania Journal of Science
The rate of displacement of the chloride ligands by three neutral nucleophiles (Nu) of different steric demands, namely thiourea (TU), N,N’-dimethylthiourea (DMTU) and N,N,N,’N-tetramethylthiourea (TMTU) in the complexes viz; [Pt(II)(bis(2-pyridylmethyl)amine)Cl]ClO4, (Pt1), [Pt(II){N-(2-pyridinylmethyl)-8-quinolinamine}Cl]Cl, (Pt2), [Pt(II)(bis(2-pyridylmethyl)sulfide)Cl]Cl, (Pt3) and [Pt(II){8-((2-pyridylmethyl)thiol)quinoline}Cl]Cl, (Pt4) was studied under pseudo first-order conditions as a function of concentration and temperature using a stopped-flow technique and UV-Visible spectrophotometry. The observed pseudo first-order rate constants for substitution reactions obeyed the simple rate law. The results have shown that the chloro ligand in Pt(N^S^N) complexes is more labile by two orders of magnitude than Pt(N^N^N) complexes due to the high trans labilizing …
Total Electron Content Derived From Global Positioning System During Solar Maximum Of 2012-2013 Over The Eastern Part Of The African Sector, Emmanuel D Sulungu, Christian Bs Uiso, Patrick Sibanda
Total Electron Content Derived From Global Positioning System During Solar Maximum Of 2012-2013 Over The Eastern Part Of The African Sector, Emmanuel D Sulungu, Christian Bs Uiso, Patrick Sibanda
Tanzania Journal of Science
This work presents results of diurnal, seasonal and latitudinal variations of vertical Total Electron Content (TECv) derived from GPS receivers at four locations, [Dodoma (6.19oS, 35.75oE), Mzuzu (11.43oS, 34.01oE), Zomba (15.38oS, 35.33oE) and Tete (16.15oS, 33.58oE)] during the solar maximum period of 2012 – 2013. The receivers are located directly below the EIA and at approximately the same longitude, ~ (33 – 3 oE) within the eastern part of the African sector. Diurnal and latitudinal variations of TECv are presented for an average of the five (5) quietest days of each of the four seasons: March equinox, June solstice, September …
Structural Classification Using Aeromagnetic Data And Pseudogravity Transforms: A Case Study Of Pategi Area Of Bida Basin, Nigeria, Ayodele K Olawuyi, Halima M Amir, Mkabwa Lk Manoko
Structural Classification Using Aeromagnetic Data And Pseudogravity Transforms: A Case Study Of Pategi Area Of Bida Basin, Nigeria, Ayodele K Olawuyi, Halima M Amir, Mkabwa Lk Manoko
Tanzania Journal of Science
The structural classification with 3D Euler deconvolution method in the Pategi area, a transition environment between the Basement complex rocks of the southwestern Nigeria and the Sedimentary rocks of the Nupe Basin was carried out. It was aimed at identification of the structural features responsible for the hydrogeology and mineralization potentials of the area. This work involves the qualitative and quantitative analysis of aeromagnetic data and pseudogravity transforms using Oasis MontajTM. The 3-D Euler deconvolution of the acquired aeromagnetic data and pseudogravity transforms using Oasis montajTM software and the geologic information on this area was employed in the structural classification …
Seasonal Variation And Nutrient Levels Influence Phenolic Contents In Seagrass Thalassia Hemprichii Along Dar Es Salaam Coast, Asukisye Kajela, Esther F Mvungi
Seasonal Variation And Nutrient Levels Influence Phenolic Contents In Seagrass Thalassia Hemprichii Along Dar Es Salaam Coast, Asukisye Kajela, Esther F Mvungi
Tanzania Journal of Science
Seasonal variation in total phenolics in Thalassia hemprichii from four different sites with varied nutrient loading along Dar es Salaam coast was studied. Besides few studies existing on phenolics in seagrass species done to assess status of the seagrass meadows, there is paucity of information for seagrass species along the coast of Indian Ocean in Dar es Salaam. In this study, Thalassia hemprichii shoots were collected from four different sites having different levels of anthropogenic pressure during dry and rainy seasons. The total phenol contents of above and belowground parts of the seagrass were determined using Folin-Ciocalteu method. Results indicates …
Effects Of Magnetic Fields On An Unsteady Mixed Convective Boundary Layer Flow Of An Electrically Conducting Fluid With Temperature Dependent Properties, Raymond Kitengeso, Eunice Mureithi, Makungu James, John Mango
Effects Of Magnetic Fields On An Unsteady Mixed Convective Boundary Layer Flow Of An Electrically Conducting Fluid With Temperature Dependent Properties, Raymond Kitengeso, Eunice Mureithi, Makungu James, John Mango
Tanzania Journal of Science
A mixed convective boundary layer flow of an electrically conducting fluid with temperature dependent properties over an inclined plate is investigated. The magnetohydrodynamic boundary layer governing equations are derived by using Boussinesq and boundary layer approximations. The equations are transformed to similarity form using a similarity transformation variable and the resulting boundary value problem is solved numerically. The effects of magnetic fields, unsteadiness, mixed convection and variable fluid properties on velocity and temperature in the boundary layer are analysed. The effects of pertinent parameters on skin friction and heat transfer are also analysed
Fluoride Occurrence In Domestic Water Supply Sources In Tanzania: A Case Of Meru District Arusha Region, Godfrey Mbabaye, Rwaichi Minja, Felix Mtalo, Isack , Legonda, Godfrey Mkongo
Fluoride Occurrence In Domestic Water Supply Sources In Tanzania: A Case Of Meru District Arusha Region, Godfrey Mbabaye, Rwaichi Minja, Felix Mtalo, Isack , Legonda, Godfrey Mkongo
Tanzania Journal of Science
Surface and ground water are the major sources of water supply in Meru district. Most of the people in Meru rural areas depend on surface water in rivers and ground water shallow and deep wells and springs for house hold activities. The presence of fluoride in high concentrations in drinking water or cooking water causes severe health problems to the people. Distribution of fluoride concentrations in Meru district domestic water sources was studied by referencing the location of water sources using Extrex 20 garmin hand held GPS instrument. Fluoride concentrations were measured using Metrohm Ag/AgCl reference electrode connected to a …
Nuclear Analytical Techniques In Tanzania: A Review, Yusufu Koleleni
Nuclear Analytical Techniques In Tanzania: A Review, Yusufu Koleleni
Tanzania Journal of Science
It has been a tradition to perceive that Nuclear/Atomic radiations are only related to Nuclear/Atomic bombs, heavy ammunitions and consequently applications for human and non-peaceful destructions. In this paper the questions on how the Nuclear/Atomic radiations may be used for peaceful applications and specifically to Tanzanian situations are presented. Methods like Energy Dispersive X-Ray fluorescence (EDXRF), Particle Induced X-Ray Emission (PIXE), Electron probe Micro-Mass Analysis (EPMA), Neutron Activation Analysis (NAA) for investigations of different types of samples in geology; environmental, medical, biological and chemical are discussed.