Open Access. Powered by Scholars. Published by Universities.®
- Institution
-
- University of Dar es Salaam (691)
- California State University, San Bernardino (7)
- University of Nevada, Las Vegas (6)
- Louisiana State University (4)
- Michigan Technological University (4)
-
- University of Dayton (4)
- University of Nebraska - Lincoln (4)
- Kennesaw State University (3)
- SIT Graduate Institute/SIT Study Abroad (3)
- University of North Florida (3)
- California Polytechnic State University, San Luis Obispo (2)
- Ohio University (2)
- University of Rhode Island (2)
- Association of Arab Universities (1)
- Beirut Arab University (1)
- Central Mining Institute (1)
- China Coal Technology and Engineering Group (CCTEG) (1)
- Chulalongkorn University (1)
- Clark University (1)
- Cleveland State University (1)
- Embry-Riddle Aeronautical University (1)
- Faculty of Engineering, Mansoura University (1)
- HBRC Journal (1)
- James Madison University (1)
- Missouri University of Science and Technology (1)
- Neutrosophic Systems with Applications (1)
- New Jersey Institute of Technology (1)
- Old Dominion University (1)
- Portland State University (1)
- Purdue University (1)
- Keyword
-
- Physical Sciences (62)
- Tanzania (46)
- Sustainability (14)
- Optimization (10)
- Engineering education (9)
-
- Mathematics and Computational Sciences (8)
- Efficiency (7)
- Higher education (7)
- Mechanical properties (7)
- University of Dar es Salaam (7)
- Curriculum development (6)
- Fluid dynamics (6)
- Industrial collaboration (6)
- Reinforced concrete (6)
- Renewable energy (6)
- Sustainable development (6)
- Cellulose (5)
- Curriculum design (5)
- Dar es Salaam (5)
- Developing Countries (5)
- Environmental impact (5)
- Industrial engineering (5)
- Performance (5)
- Strength (5)
- Urbanization (5)
- Agricultural machinery (4)
- Biological Sciences (4)
- Carbonitriding (4)
- Civil engineering (4)
- Combustion (4)
- Publication Year
- Publication
-
- Tanzania Journal of Engineering and Technology (TJET) (616)
- Tanzania Journal of Science (74)
- Journal of International Technology and Information Management (6)
- UNLV Theses, Dissertations, Professional Papers, and Capstones (5)
- Civil and Environmental Engineering and Engineering Mechanics Faculty Publications (4)
-
- Independent Study Project (ISP) Collection (3)
- LSU Doctoral Dissertations (3)
- UNF Graduate Theses and Dissertations (3)
- Dissertations, Master's Theses and Master's Reports (2)
- Online Journal of Space Communication (2)
- The African Journal of Information Systems (2)
- African Conference on Information Systems and Technology (1)
- Applied Mathematics & Information Sciences (1)
- Architectural Engineering (1)
- BAU Journal - Science and Technology (1)
- BSE Department Magazine (1)
- Chulalongkorn University Theses and Dissertations (Chula ETD) (1)
- Civil Engineering Theses - Archive (1)
- Civil and Environmental Engineering Faculty Publications (1)
- Civil and Environmental Engineering and Construction Faculty Research (1)
- Coal Geology & Exploration (1)
- Computer Science and Engineering Senior Theses (1)
- Conference papers (1)
- Construction Management (1)
- Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research (1)
- Dissertations, Master's Theses and Master's Reports - Open (1)
- Doctoral Dissertations and Master's Theses (1)
- Durham School of Architectural Engineering and Construction: Faculty Publications (1)
- Electronic Theses, Projects, and Dissertations (1)
- Engineering Management & Systems Engineering Theses & Dissertations (1)
- Publication Type
Articles 391 - 420 of 761
Full-Text Articles in Entire DC Network
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 …
Cultivating Third Party Development In Platform-Centric Software Ecosystems: Extended Boundary Resources Model, Brown C. Msiska
Cultivating Third Party Development In Platform-Centric Software Ecosystems: Extended Boundary Resources Model, Brown C. Msiska
The African Journal of Information Systems
Software ecosystems provide an effective way through which software solutions can be constructed by composing software components, typically applications, developed by internal and external developers on top of a software platform. Third party development increases the potential of a software ecosystem to effectively and quickly respond to context-specific software requirements. The boundary resources model gives a theoretical account for cultivation of third party development premised on the role of platform boundary resources such as application programming interfaces (API). However, from a longitudinal case study of the DHIS2 software ecosystem, this paper observes that no matter how good the boundary resources …
Low Voltage Ride Through Enhancement For Wind Turbines Equipped With Dfig Under Symmetrical Grid Faults, Francis Mwasilu
Low Voltage Ride Through Enhancement For Wind Turbines Equipped With Dfig Under Symmetrical Grid Faults, Francis Mwasilu
Tanzania Journal of Engineering and Technology (TJET)
In modern power systems with significant penetration of wind-turbines (WTs), improvement of low voltage ride through (LVRT) capability of WTs equipped with doubly-fed induction generators (DFIGs) is an important issue. Thus, this paper proposes a low voltage ride through (LVRT) strategy, which comprise of a capacitor connected in series with an inductor both connected in parallel to a resistor. The configuration is then connected to a small series resistor via a pair of antiparallel-Thyristors. The circuit and its switching control scheme of the proposed LVRT circuit are designed to: minimize the transition times, maintain the RSC connection to the rotor-windings, …
Modelling Transport Of Nitrogen Compounds In Geita Wetland Along Mtakuja River, Ezrael Masawe
Modelling Transport Of Nitrogen Compounds In Geita Wetland Along Mtakuja River, Ezrael Masawe
Tanzania Journal of Engineering and Technology (TJET)
The impacts of excessive nitrogen loading to streams in a watershed occur in the receiving waters such as rivers at the outlet of the watershed. To quantify the impacts of land use and management practices on the nitrogen loading at the watershed outlet, simulation models are needed that can both predict the nitrogen loading at the edge of individual fields and predict the fate of nitrogen as it moves through the river network to the watershed outlet. This paper presents the results of a model analysis for describing the processes governing transformations and transport of nitrogen compounds (NO3-N and NH4-N) …
Analysis Of Drought Using Meteorological And Microwave Remote Sensed Data: A Case Of Wami Watershed, Tanzania, Deogratias Mulungu
Analysis Of Drought Using Meteorological And Microwave Remote Sensed Data: A Case Of Wami Watershed, Tanzania, Deogratias Mulungu
Tanzania Journal of Engineering and Technology (TJET)
Agricultural sector is important for the economy of Tanzania, but in recent years there is decline in its growth and performance because of persistent droughts. An in-depth study of droughts was conducted on Wami watershed through rainfall and satellite microwave remote sensing data leading for estimates of meteorological droughts and soil moisture based droughts, respectively. Rainfall data during 1973-2008 was used to obtain Drought Severity Index (DSI) and active imaging microwave radar data during 1997-2009 from ESA’s SAR missions of ENVISAT and ERS was used to obtain soil moisture anomalies (SMA). Soil map was used to explain discrepancies in droughts …
The Fate Of Nitrogen And Faecal Coliform In The Lubigi Wetland In Uganda, Aloyce Mayo
The Fate Of Nitrogen And Faecal Coliform In The Lubigi Wetland In Uganda, Aloyce Mayo
Tanzania Journal of Engineering and Technology (TJET)
The capacity of the Lubigi wetland to reduce nitrogen and faecal coliform pollution entering Lake Kyoga in Uganda was investigated. Three transects with 5 sampling points in each, were established in the wetland. Wetland plants samples were collected from the specific locations along the transects, and laboratory tests and analyses were carried out for plants biomass and nitrogen contents determination. Samples of wetland sediments were also collected, and laboratory tests and analyses were done for determination of nitrogen content in the sediments. Wetland water samples were taken from the main wetland inlet and the main outlet from the wetland main …
Effects Of Methyl-Blue Addition In Sewage Substrate On The Performance Of Microbial Fuel Cell, Joseph H. Kihedu Dr.
Effects Of Methyl-Blue Addition In Sewage Substrate On The Performance Of Microbial Fuel Cell, Joseph H. Kihedu Dr.
Tanzania Journal of Engineering and Technology (TJET)
Experimental study was undertaken to evaluate performance of microbial fuel cell. Without addition of methyl blue, the cell generated 1.265 V, 0.403 mA and 56.12 mW/m2 after three hours of operation. With 300 µM methyl blue in sewage anolyte, 6.7% increase in voltage, 20.5% increase in current and 28.6% increase in power density was observed. By using ash water catholyte, addition of methyl blue in anolyte led to increase of 9.0% in voltage, 38.5% in current and 50.9% for power density. Between three and twenty four hours of continuous operation of the cell with phosphate buffer catholyte, the average voltage …
Development Of Digital Diary For Enhanced Parental School Involvement In Tanzania, Sekione R. Jeremiah, Joel S. Mtebe Phd
Development Of Digital Diary For Enhanced Parental School Involvement In Tanzania, Sekione R. Jeremiah, Joel S. Mtebe Phd
The African Journal of Information Systems
The study examined the use of digital diary as a tool for enhancing parental school involvement in Tanzania. The development of the digital diary followed eXtreme Programming agile method where 87 parents and 6 teachers from St. Florence school were involved. Parents and teachers were given six months to use the tool before testing for its effectiveness using data from 7 teachers and 156 parents through semi-structured interviews and questionnaires respectively. The study found that the majority of respondents (84.4% of parents and 96.7% of teachers) indicated that the digital diary was useful tool as enabled them to track children’s …
The Power Of Coefficients And Methods Of Coding In Delimiting Species Using Phenetic Approach: The Case Of African Solanum Section Solanum Sensu Edmonds, Mkabwa Lk Manoko
The Power Of Coefficients And Methods Of Coding In Delimiting Species Using Phenetic Approach: The Case Of African Solanum Section Solanum Sensu Edmonds, Mkabwa Lk Manoko
Tanzania Journal of Science
Phenetics is one of approaches used to delimit species in plant classification. Conclusion in phenetics is based on overall similarity often of morphological data. The approach uses coded data that are analyzed using coefficients to create similarity matrices that are analyzed using clustering analysis to create the classification. Exists different similarity coefficients and coding methods though in practice are used intuitively sometimes giving results that have been challenged. Though similarity coefficients and coding methods have some times been blamed, studies to analyze their influences are limited. The trend however is to avoid morphological data in favor of DNA markers. The …
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 …
Through-The-Wall Radar Imaging With Compressive Sensing; Theory, Practice And Future Trends-A Review, Abdi Abdalla
Through-The-Wall Radar Imaging With Compressive Sensing; Theory, Practice And Future Trends-A Review, Abdi Abdalla
Tanzania Journal of Science
Through-the-Wall Radar Imaging (TWRI) is anemerging technology which enables us to detect behind the wall targets using electromagnetic signals. TWRI has received considerable attention recently due to its diverse applications. This paper presents fundamentals, mathematical foundations and emerging applications of TWRI with special emphasis on Compressive Sensing (CS) and sparse image reconstruction.Multipath propagation stemming from the surrounding walls and nearby targets are among the impinging challenges.Multipath components produce replicas of the genuine target, ghosts, during image reconstruction which may significantly increase the probability of false alarm. The resulting ghost not only creates confusion with genuine targets but may deteriorate the …
Evaluation Of Well Designs To Improve Access To Safe And Clean Water In Rural Tanzania, Aminata Kilungo, Linda Powers, Nathan B. Arnold, Kelli Marie Whelan, Kurt Paterson, Dale Young
Evaluation Of Well Designs To Improve Access To Safe And Clean Water In Rural Tanzania, Aminata Kilungo, Linda Powers, Nathan B. Arnold, Kelli Marie Whelan, Kurt Paterson, Dale Young
Michigan Tech Publications, Part 1
The objective of this study was to examine three well designs: drilled wells (20–30 m deep), closed dug wells (>5 m deep), and hand-dug open wells (<5 m deep), to determine the water quality for improving access to safe and clean water in rural communities. Heterotrophic plate count (HPC), total coliforms (TC), Escherichia coli (E. coli) and turbidity, were used to assess the water quality of 97 wells. Additionally, the study looked at the microflora diversity of the water, focusing on potential pathogens using outgrowth, PCR, and genome sequencing for 10 wells. Concentrations of TC for the open dug wells (4 × 104 CFU/100 mL) were higher than the drilled (2 × 103 CFU/100 mL) and closed dug wells (3 × 103 CFU/100 mL). E. coli concentration for drilled and closed dug wells was <22 MPN (most probable number)/100 mL, but higher for open wells (>154 MPN/100 mL). The drilled well turbidity (11 NTU) was within the standard deviation of the closed well (28 NTU) compared to open dug wells (49 NTU). Drilled and closed wells had similar microbial diversity. There were no …
Removal Of Organic Material In Free Water Surface Gravel Bed Filters, Aloyce Mayo
Removal Of Organic Material In Free Water Surface Gravel Bed Filters, Aloyce Mayo
Tanzania Journal of Engineering and Technology (TJET)
The removal of organic material in free surface gravel bed filters was investigated and modelled. Two pilot wetland units of 7.5m x 1.5m x 0.7m were constructed adjacent to the University of Dar es Salaam waste stabilization ponds to receive maximum organic and hydraulic loading rates of less than 185 kg/ha/d and 110 l/m2/d, respectively. These units received wastewater of domestic characteristics from primary stabilization pond. The entire depth of 0.7 m of the wetland units were packed with gravel of size 8 ~ 25 mm and porosity of 35%. Samples were collected from the influent and effluent of wetland …
Moisture Induced Deformations In Glulam Members - Experiments And 3-D Finite Element Model, Henry Meleki Kiwelu
Moisture Induced Deformations In Glulam Members - Experiments And 3-D Finite Element Model, Henry Meleki Kiwelu
Tanzania Journal of Engineering and Technology (TJET)
Experiments were performed on scaled glue laminated bending specimens to observe time dependent development of deformations during drying and wetting. Measurements determined changes in the average moisture content and external shape and dimensions between when specimens were placed into constant or variable climates. Alterations in the external shape and dimensions reflected changes in the average value and distribution of moisture and mechanosorptive creep in the glulam. The results are being used to develop a sequentially-coupled three-dimensional hygrothermal Finite Element (FE) model for predicting temporally varying internal strains and external deformations of drying or wetting solid wood structural components. The model …
Handling Of Syringe Sharps In A Non-Incineration Health Care Waste Disposal, Tito Mwinuka
Handling Of Syringe Sharps In A Non-Incineration Health Care Waste Disposal, Tito Mwinuka
Tanzania Journal of Engineering and Technology (TJET)
An attempt has been made by the R&D team of the University of Dar es Salaam to design and manufacture two needle cutter prototypes, a manually operated and an automatic needle cutter to be used in rural and urban areas, respectively. This is part of the UNDP and WHO efforts aimed at promoting the non-burn medical waste disposal technologies in developing countries such as Argentina, India, Latvia, Lebanon, Philippines, Senegal, Tanzania and Vietnam. The project also involves designing and manufacturing of the autoclaves for sterilizing of needle cutters and other infectious medical waste. The use of needle cutters in hospitals …
Design And Manufacture Of A Waste Compactor Prototype: A Step Towards Implementing A Non-Burn Health Care Waste Disposal In Developing Countries, Tito Mwinuka
Tanzania Journal of Engineering and Technology (TJET)
Non-burn technology is the only safe way of handling and disposing infectious healthcare waste. It involves steam treatment of infectious waste at temperatures higher than 121 o C for a minimum of 30 minutes before disposing them just like other municipal waste. Infectious healthcare waste is normally only about 10 25% of all healthcare waste. In this paper, design, manufacturing and testing of a waste compactor for reducing waste volume to facilitate its handling is discussed. Preliminary tests show that the waste volume can be reduced to less than 10% of its original volume using the developed compactor. Waste compactors …
Ict Adoption And Use In Tanzania Smes, Cuthbert Msuya
Ict Adoption And Use In Tanzania Smes, Cuthbert Msuya
Tanzania Journal of Engineering and Technology (TJET)
The purpose of this paper was to establish the status of ICTs adoption and use in Tanzania SMEs. Previously, it was shown that there is a shortage of comprehensive, accurate and up to date data on many aspects of the SMEs sector including the level of ICT adoption and use. This has affected government efforts aimed at development of this important sector in the economic development of the country. Results show that: (i) By year 2014, adoption of ICTs in SMEs had grown from almost non-existence in year 2004 to 80.1% computer technology use, and over 56.6% for use of …
Restoration Of Historic Buildings In Zanzibar, John K. Makunza Jkm
Restoration Of Historic Buildings In Zanzibar, John K. Makunza Jkm
Tanzania Journal of Engineering and Technology (TJET)
Looking at current state of most repaired historic buildings in Stone Town of Zanzibar, it is quite clear that the repair attempts made have not been very successful. Modern materials and techniques introduced in the repair works have often proven to be incompatible with the original materials causing accelerated deterioration of buildings fabric. This shows that, there is no comprehensive study undertaken so far on identifying the appropriate materials and restoration techniques. To solve this problem, a study has been made with the main objective of developing the means of restoring historic buildings by using materials existing in Stone Town …
Solid Waste Management In The Developing World: The Role Of Local Government In Kisumu, Kenya, Rachel Schlueter
Solid Waste Management In The Developing World: The Role Of Local Government In Kisumu, Kenya, Rachel Schlueter
Independent Study Project (ISP) Collection
As the world becomes more urbanized, more waste is being produced. According to United Nations projections in 2014, 66% of the world’s population will be living in cities by 2050 with the majority of growth occurring in African cities. Managing urban waste in lower-middle income countries, such as Kenya, poses a particular challenge as income levels rise, municipal capacities are stretched, and foreign loans complicate accountability. This project sought to assess the practical role of local government when managing solid waste in the context of long-term development strategies. The objectives of this study are to first establish the current role …
The Effectiveness Of Sanitary Inspections As A Risk Assessment Tool For Thermotolerant Coliform Bacteria Contamination Of Rural Drinking Water: A Review Of Data From West Bengal, India, Christian Snoad, Corey L. Nagel, Animesh Bhattacharya, Evan A. Thomas
The Effectiveness Of Sanitary Inspections As A Risk Assessment Tool For Thermotolerant Coliform Bacteria Contamination Of Rural Drinking Water: A Review Of Data From West Bengal, India, Christian Snoad, Corey L. Nagel, Animesh Bhattacharya, Evan A. Thomas
Mechanical and Materials Engineering Faculty Publications and Presentations
The use of sanitary inspections combined with periodic water quality testing has been recommended in some cases as screening tools for fecal contamination. We conducted sanitary inspections and tested for thermotolerant coliforms (TTCs), a fecal indicator bacteria, among 7,317 unique water sources in West Bengal, India. Our results indicate that the sanitary inspection score has poor ability to identify TTC-contaminated sources. Among deep and shallow hand pumps, the area under curve (AUC) for prediction of TTC > 0 was 0.58 (95% confidence interval [CI] = 0.53–0.61) and 0.58 (95% CI = 0.54–0.62), respectively, indicating that the sanitary inspection score was only …
Why Mobile Money Users Keep Increasing? Investigating The Continuance Usage Of Mobile Money Services In Tanzania, Daniel Koloseni, Herman Mandari
Why Mobile Money Users Keep Increasing? Investigating The Continuance Usage Of Mobile Money Services In Tanzania, Daniel Koloseni, Herman Mandari
Journal of International Technology and Information Management
This study examined factors that affect continuance usage of mobile money services in Tanzania. The Theory of Planned Behavior was adopted as a theoretical foundation of the study. The theory was further extended by including the constructs of perceived cost, perceived trust and satisfaction as determinants of mobile money service continuance usage behaviour. A total of 309 valid and reliable responses collected using questionnaires were used for data analysis. The data were analysed using Structural Equation Modeling (SEM) approach. The findings depict that perceived trust, attitude and perceived behavioral control have significant influence on continuance behavioral intention while perceived trust, …
Use Of Cycling Paths Along The Morogoro Brt Line, Ford Sanger
Use Of Cycling Paths Along The Morogoro Brt Line, Ford Sanger
Independent Study Project (ISP) Collection
As the urban population continues to increase rapidly in Dar es Salaam it will become increasingly important to find sustainable means of urban transportation. With planned infrastructure improvements in the city to help alleviate traffic congestion, bicycles, which represent a largely underutilized form of urban transportation, have the potential to play a large role in the future of the city. Through background research, direct observations, community surveys, and interviews, both formal and informal, this study sought to understand the impact of the recent addition of bike lanes along the first phase of the Dar Bus Rapid Transit line. It was …
Kicm: A Knowledge-Intensive Context Model, Fredrick Mtenzi, Denis Lupiana
Kicm: A Knowledge-Intensive Context Model, Fredrick Mtenzi, Denis Lupiana
Conference papers
A context model plays a significant role in developing context-aware architectures and consequently on realizing context-awareness, which is important in today's dynamic computing environments. These architectures monitor and analyse their environments to enable context-aware applications to effortlessly and appropriately respond to users' computing needs. These applications make the use of computing devices intuitive and less intrusive. A context model is an abstract and simplified representation of the real world, where the users and their computing devices interact. It is through a context model that knowledge about the real world can be represented in and reasoned by a context-aware architecture. This …
Safety Analysis Of Freeway Segments With Unobserved Heterogeneity And Second Order Spatial Effects, Eneliko Mujuni Mulokozi
Safety Analysis Of Freeway Segments With Unobserved Heterogeneity And Second Order Spatial Effects, Eneliko Mujuni Mulokozi
UNLV Theses, Dissertations, Professional Papers, and Capstones
Safety analysis of freeway networks entails the quantification of crash frequency influencing factors which include roadway and traffic characteristics, environmental factors as well as human factors. This quantification can be used to detect locations with large impacts on the occurrence of crashes which in turn assist engineers and planners to improve safety levels of the network. Roadway characteristics are comprised of the physical elements of the road geometry such as section length, median and right shoulders, speed-exchange lanes, the number of main facility as well as geometry of the entrance from and exit to the main freeway facility. Traffic characteristics …
Comparison Of Accuracies In Techniques For Evaluating Wind Power Density, Reuben Kainkwa, John Kumwenda
Comparison Of Accuracies In Techniques For Evaluating Wind Power Density, Reuben Kainkwa, John Kumwenda
Tanzania Journal of Science
Wind power is among important renewable sources of energy. In order to know the magnitude of wind power, appropriate techniques for evaluating it need to be investigated. Apart from the standard formula that can be used to evaluate wind power density at a site there are two more techniques namely power law exponent and Weibull two-parameter density function. However the accuracy of the latter two methods relative to the standard one has not yet been investigated. The main objective of this paper is to compare accuracies of these techniques. The wind power densities were calculated using standard formula, Weibull model …
Effects Of Target Composition On The Optical Constants Of Dc Sputtered Zno:Al Thin Films, B. Samwel, M. E. Samiji, N.R. Mlyuka
Effects Of Target Composition On The Optical Constants Of Dc Sputtered Zno:Al Thin Films, B. Samwel, M. E. Samiji, N.R. Mlyuka
Tanzania Journal of Science
Al-doped ZnO thin films were deposited from ZnO:Al ceramic and Zn:Al metal alloy targets in Ar and Ar + O2 atmospheres respectively, using Direct Current (DC) magnetron sputtering. The samples exhibited transmittance T > 80% in visible region with good NIR shielding. The results indicated that, band gap energy ranged from 3.34 to 3.44 eV and 3.39 to 3.46 eV for films prepared from alloy and ceramic targets, respectively. Films obtained from alloy target at a substrate temperature of 200 oC showed low electrical sheet resistance of 10 Ω/sq, and highest values of mobility (15.9 cm2/Vs) and carrier concentration (2.98 × …
A Technical And Cultural Feasibility Assessment Of Household Microbial Fuel Cells For Use In Hanan'g District, Tanzania, Erinn Kunik
Dissertations, Master's Theses and Master's Reports
Microbial fuel cells (MFCs) are an emerging electricity generation technology that has the potential for use in developing countries. This study assessed the feasibility of using MFCs in Tanzania through technical analysis of a MFC prototype alongside with interviews with Tanzanians for a cultural feasibility assessment of MFCs. For the technical analysis, this study evaluated the inputs needed for a household MFC to operate and produce electricity with cattle manure as a fuel and evaluated the electrochemical and chemical performance as well as the fecal coliform reduction of the manure during MFC operation. For this study, a MFC was built …
Climate Change Implications For Health-Care Waste Incineration Trends During Emergency Situations, Emilia Mmbando Raila
Climate Change Implications For Health-Care Waste Incineration Trends During Emergency Situations, Emilia Mmbando Raila
Walden Dissertations and Doctoral Studies
Healthcare waste (HCW) incineration practices in the global South countries are among the major sources of black carbon (BC) emissions or smoke. This study analyzes HCW incineration trends during emergency situations and smoke from HCW incineration processes in Haiti. The study was prompted by the current arguments about the climate change and the growing health effects associated with BC emissions. The conceptual framework was based on both adverse health effects from BC emissions exposure and climate change potential of BC emissions. Therefore, the goal was to determine whether cardboard HCW sharps containers emit lower BC emissions to the atmosphere during …
Interorganizational Collaboration And Systemic Change Framework For Building Information Modeling (Bim) Adoption, Rehema Joseph Monko
Interorganizational Collaboration And Systemic Change Framework For Building Information Modeling (Bim) Adoption, Rehema Joseph Monko
LSU Doctoral Dissertations
It was found that an integrated framework needs to be developed for the construction industry that allows optimized interorganizational collaboration and systemic change while using Building Information Modeling (BIM) technologies. The framework needs to be effective so the industry can adopt BIM through a set of interdependent activities beyond their organizational boundaries. The adoption has been proven difficult because of industry competitiveness and a fragmented work environment. Meanwhile, existing frameworks vary between studies. This research developed an integrated framework, identified critical factors, and provided an evaluation guide for interorganizational collaboration and set of coordinated changes necessary to adopt BIM. This …
Properties Of Boards Made From Rice Husk And Portland Cement As Binders And Reinforced With Sisal Fibres, Alex Mrema
Properties Of Boards Made From Rice Husk And Portland Cement As Binders And Reinforced With Sisal Fibres, Alex Mrema
Tanzania Journal of Engineering and Technology (TJET)
A research study demonstrated that rice husks can be used to manufacture boards which can be used in low cost housing if bound by Portland limestone cement (CEM II/A-L/ 32.5R) and reinforced with sisal fibers to cater for their brittle behavior and that such boards can provide a substitute for wood panels. Boards made of rice husks and cement in the ratios of 1/3.3, 1/ 3.6 and 1/4 and with sisal fiber reinforcement contents of 0%, 0.4%, 0.5% and 0.8% were prepared and tested for their physical and mechanical properties. The results were compared with standard requirements for boards made …