Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Physical Sciences and Mathematics (780)
- Engineering (691)
- Life Sciences (533)
- Operations Research, Systems Engineering and Industrial Engineering (267)
- Electrical and Computer Engineering (257)
-
- Biology (249)
- Civil and Environmental Engineering (216)
- Industrial Engineering (214)
- Mechanical Engineering (191)
- Plant Sciences (187)
- Civil Engineering (186)
- Earth Sciences (183)
- Plant Biology (178)
- Chemical Engineering (160)
- Applied Mathematics (150)
- Risk Analysis (146)
- Geology (139)
- Physics (131)
- Chemistry (119)
- Arts and Humanities (118)
- Social and Behavioral Sciences (118)
- Computer Sciences (115)
- Electrical and Electronics (104)
- Systems and Communications (100)
- Engineering Science and Materials (91)
- Energy Systems (90)
- Ecology and Evolutionary Biology (86)
- Environmental Sciences (86)
- Power and Energy (82)
- Other Operations Research, Systems Engineering and Industrial Engineering (79)
- Keyword
-
- Physical Sciences (484)
- Biological Sciences (341)
- Tanzania (256)
- Mathematics and Computational Sciences (127)
- Heavy metals (30)
-
- Sediments (24)
- Dar es Salaam (20)
- Conservation (18)
- Sustainability (18)
- Lake Victoria (17)
- Pollution (16)
- SMEs (14)
- Adsorption (13)
- Performance (13)
- Contamination (12)
- Efficiency (12)
- Maize (12)
- Higher education (11)
- Optimization (11)
- Uganda (10)
- Climate change (9)
- Diversity (9)
- Engineering education (9)
- Forest (9)
- Tanzania. (9)
- Antibacterial activity (8)
- Biogas (8)
- Ecosystem (8)
- Fish (8)
- Gender (8)
- Publication Year
- Publication
- File Type
Articles 1681 - 1710 of 2227
Full-Text Articles in Entire DC Network
Spectral Analysis Of Ground Magnetic Data In Magadi Area, Southern Kenya Rift, Jg Githiri, Jp Patel, Jo Barongo, Pk Karanja
Spectral Analysis Of Ground Magnetic Data In Magadi Area, Southern Kenya Rift, Jg Githiri, Jp Patel, Jo Barongo, Pk Karanja
Tanzania Journal of Science
The area surrounding Lake Magadi in the southern Kenya rift is characterized by hot springs that issue from fractures distributed along the shores of the lake. Presence of earthquake swarms that cluster in northern margin of Lake Magadi strongly indicate magmatic activity in the area. This study was done as a follow-up to investigate depth to the heat source possibly causing high seismic activity and high heat flow in the area. A ground magnetic survey was conducted to investigate geothermal potential of the area and a magnetic anomaly contour map prepared. Spectral analysis involving determining power spectrum was applied to …
Characterisation Of Rapeseed Oil Based Resins Using Infrared And Thermogravimetry Techniques, L. Y. Mwaikambo
Characterisation Of Rapeseed Oil Based Resins Using Infrared And Thermogravimetry Techniques, L. Y. Mwaikambo
Tanzania Journal of Science
Rapeseed oil which is a triglyceride had undergone chemical modification on its structure to obtain hydroxyl groups. The hydroxylated chemical structure was crosslinked using methylene-pphenyl diisocyanate to produce a thermoset rapeseed oil resin. The cross linking process was monitored in situ using the Attenuated Total Internal Reflectance Fourier Transform-Infrared spectroscopy and the thermogravimetric analysis techniques. The infrared technique was also used to monitor chemical groups of the unmodified rapeseed oil. A reduction of the absorption band around 3300 cm-1 which is due to the presence of hydroxyl groups was observed indicating the occurrence of the reaction between the hydroxylated rapeseed …
Landsat Remote Sensing Data As An Alternative Approach For Geological Mapping In Tanzania: A Case Study In The Rungwe Volcanic Province, South-Western Tanzania, E. E. Mshiu
Tanzania Journal of Science
Rungwe Volcanic Province (RVP) is mostly covered by extrusive rocks that overlain the Precambrian basement. The use of Landsat data in this area has revealed the need of effective use of these data in geological mapping programs in Tanzania. Landsat band ratios 5/1, 3/7, 5/7 and 5/4 as well as R: G: B composite images 7:4:1, 7:5:4, 1/3:5/7:3/5 and 4/5:6/7:4/6 played an important role in identifying different rock types in the study area. Ratio images managed clearly to distinguish between mafic and felsic rocks whereby two lithological blocks were identified, Block 1 covers a combination of intrusive and metamorphic rocks …
Growth Performance, Yields And Economic Benefits Of Nile Tilapia Oreochromis Niloticus And Kales Brassica Oleracea Cultured Under Vegetable-Fish Culture Integration, A. P. Shoko, A. Getabu, G. Mwayuli, Y. D. Mgaya
Growth Performance, Yields And Economic Benefits Of Nile Tilapia Oreochromis Niloticus And Kales Brassica Oleracea Cultured Under Vegetable-Fish Culture Integration, A. P. Shoko, A. Getabu, G. Mwayuli, Y. D. Mgaya
Tanzania Journal of Science
An experiment was conducted for 210 days to demonstrate the role of vegetable-fish culture integration in the growth, yields and economic benefits of fish and vegetables. Two 200 m2 earthen fishponds were stocked with Nile tilapia Oreochromis niloticus at 20,000 fish fingerlings per hectare. Pond A was fertilized with chicken manure and stocked fish fed on 35% crude protein supplementary diet referred to here as treated fish pond (TFP). Another fish pond was not fertilized and the fish stocked in it did not receive any supplementary diet referred to here as non treated fish pond (NTFP). Twelve vegetable plots of …
Variability In Parasites’ Community Structure And Composition In Cat Fish With Respect To Level Of Pollution In Mwanza Gulf, Lake Victoria, Tanzania, C. J. Mwita
Tanzania Journal of Science
This study investigated the composition and structure of the parasite communities in Cat fish with respect to levels of water pollution in Lake Victoria. A total of 1071 Clarias gariepinus with mean TL range of 19 to 27 cm were analyzed from three localities in Mwanza Gulf (Kirumba, 298 fish infected with 15 parasite species), Nyegezi (376 fish, with 15 parasites species) and Malimbe (397 fish, with 16 parasites species). Trematodes and nematodes dominated the population with six (35.3%) and five (29.4%) species, respectively. Mean species richness and heteroxenous/monoxenous ratio showed significant changes (Fr = 8.000; p = 0.0046), being …
Two Phase Heuristic Algorithm For The University Course Timetabling Problem: The Case Of University Of Dar Es Salaam, A. R. Mushi, A. R. Mushi
Two Phase Heuristic Algorithm For The University Course Timetabling Problem: The Case Of University Of Dar Es Salaam, A. R. Mushi, A. R. Mushi
Tanzania Journal of Science
University course timetabling is the problem of scheduling resources such as lecturers, courses, and rooms to a number of timeslots over a planning horizon, normally a week, while satisfying a number of problem-specific constraints. Since timetabling problems differ from one institution to another, this paper investigated the case of the University of Dar Es salaam, based on the combination of Simulated Annealing (SA), and steepest descent in a two-phase approach. Solutions have been generated which greatly outperform the manually generated ones. Furthermore, the method compares well with previous work on Tabu Search but with faster execution time and higher quality …
Petrography And Geochemistry Of Mafic Granulites Of The Ubendian Belt: Contribution To Insights Into The Lower Continental Crust Of The Paleoproterozoic, N. Boniface
Tanzania Journal of Science
Mafic granulites of the Ubendian Belt have geochemical signature, trace and REE patterns, similar to that of the lower continental crustal rocks. A SHRIMP U-Pb single zircon date at 1977±40 Ma indicates that these rocks belong to the Paleoproterozoic Ubendian orogenic cycle, which was followed by the Mesoproterozoic tectonic disturbance that contributed to their exhumation. Orthopyroxene, clinopyroxene, garnet, hornblende, plagioclase and quartz is a frequent mineral assemblage for the mafic granulites of the Ubendian Belt, and garnet frequently form corona between plagioclase and clinopyroxene. Geothermobarometric calculations have revealed the equilibration of these rocks at a temperature range between 650 and …
Contact Metamorphism In The Supracrustal Rocks Of The Sukumaland Greenstone Belt In The North West Tanzania, N. Boniface
Contact Metamorphism In The Supracrustal Rocks Of The Sukumaland Greenstone Belt In The North West Tanzania, N. Boniface
Tanzania Journal of Science
Biotite-granite intrusions in meta-ironstones at Geita Hills and the Bukoli alkali-granite intrusion in metabasites at Mawemeru area produced heat that baked the respective country rocks through epidote-amphibolite- to amphibolite-facies. Critical and informative mineral assemblages in the metairostones of Geita Hills are garnet-grunerite-epidote-quartz and garnetferrogedrite- biotite-quartz and in the metabasites of Mawemeru is ferrotschermakite-(Naplagioclase)- quartz. Peak temperatures ranging between 438°C and 544°C were calculated from the above mineral assemblages and a pressure not exceeding 3 kbar was inferred to from the composition of magnesium-iron amphiboles (grunerite with XFe ratio of 0.83, i.e. Gru83). Hornfels textures in the metaironstones are suggested by …
Identification Of Clay Minerals Of The Eastern Southern Region Of Lake Victoria By Ethylene Glycol And Heat: X-Ray Diffraction And Infrared Spectroscopy Studies, E. H. J. Lugwisha
Identification Of Clay Minerals Of The Eastern Southern Region Of Lake Victoria By Ethylene Glycol And Heat: X-Ray Diffraction And Infrared Spectroscopy Studies, E. H. J. Lugwisha
Tanzania Journal of Science
The effect of glycol and heat on some clay minerals of the eastern southern region of Lake Victoria in Tanzania has been studied. First, Whole Rock Powder mount XRD analysis was carried out at the measuring range 2 # ranging between 2o – 65o. Four non-clay minerals found in samples were Na-feldspar, K-feldspar, pyrope and quartz. Oriented clay mineral XRD analysis diffractograms were developed when the air-dried samples were diffracted in measuring range 2# between 2oo – 32o. Main clay mineral groups found in the samples were kaolinite, illite and montmorillonite. After glycolating the samples, it was evident that kaolinite …
Host-Parasites Relationship For Lake Victoria Clariid Fishes And Their Parasite Fauna, C. J. Mwita
Host-Parasites Relationship For Lake Victoria Clariid Fishes And Their Parasite Fauna, C. J. Mwita
Tanzania Journal of Science
Host-parasite co-evolutionary relationships for the clariid fish species of the Lake Victoria basin and their parasite fauna was inferred by cytochrome b gene and the 18S rDNA using ‘a strict coevolutionary’ constrained tree method, the results of which revealed a phylogenetic incongruence between the fish hosts and their parasite fauna. The present study further indicated that the sympatric association between the clariid hosts and non-clariid fishes in Lake Victoria makes it possible for the parasites to switch from one host to another and hence the large number of shared parasites observed. The specificity of some of the parasites, e.g. Diplostomum …
Implementation Of A Tabu Search Heuristic For The Examinations Timetabling Problem, A. R. Mushi
Implementation Of A Tabu Search Heuristic For The Examinations Timetabling Problem, A. R. Mushi
Tanzania Journal of Science
This paper reports on the design and implementation of an algorithm for the construction of an examinations timetable. The Examinations Timetabling Problem is the problem of assigning examinations and candidates to time periods and examination rooms while satisfying a set of specific constraints. Every University has a different set of constraints and structure of examinations. Generally, timetabling problems are NP-Hard and therefore very difficult to solve. However, they are of great interest due to their important practical application in educational institutions. This paper discusses a heuristic algorithm basing on the examinations timetabling at the University of Dar es salaam. The …
Anthropogenic Disturbance On The Vegetation In Makurunge Woodland, Bagamoyo District, Tanzania, C. Mligo, C. Mligo
Anthropogenic Disturbance On The Vegetation In Makurunge Woodland, Bagamoyo District, Tanzania, C. Mligo, C. Mligo
Tanzania Journal of Science
Makurunge woodland is part of the major vegetation component covering coastal forest landscape in Tanzania that has been severely affected by anthropogenic disturbance. The present study determined the effects of anthropogenic disturbance on biomass, diversity, plant communities and plant species distribution pattern using nested sample plots systematically established along transects. Six major vegetation communities with different biomass were found. Plant species diversity ranged from 2.5 to 3.3 and was high in scrub forests, riverine and thicketed habitats, although the difference among these habitats was not significant (P>0.05). About 61-90% of the woodland was affected and this influenced the plant …
Classification Of Plants According To Their Heavy Metal Content Around North Mara Gold Mine, Tanzania: Implication For Phytoremediation, N. Mganga, Mlk Manoko, Z. K. Rulangaranga
Classification Of Plants According To Their Heavy Metal Content Around North Mara Gold Mine, Tanzania: Implication For Phytoremediation, N. Mganga, Mlk Manoko, Z. K. Rulangaranga
Tanzania Journal of Science
Plants like other living organisms respond differently under different environmental conditions. An elevated level of heavy metals is one of the stresses which results into three classes of plants depending on their heavy metal content. The classes of plant species according to their accumulated heavy metals around North Mara Gold Mine were not known. To study such classes, a line transect of 700m long was established opposite the gold mine wastes. A total of eight sampling points were systematically established each after every 100m in that transect. Fifteen plant species were sampled; at least one species per sampling point. Approximately …
Evaluation Of Single-Step Steam Pyrolysis-Activated Carbons From Lesotho Agro-Forestry Residues, I. Hapazari, V. Ntuli, W. Parawira
Evaluation Of Single-Step Steam Pyrolysis-Activated Carbons From Lesotho Agro-Forestry Residues, I. Hapazari, V. Ntuli, W. Parawira
Tanzania Journal of Science
Activated carbon has been widely used worldwide as an effective filtration or adsorption material for removing biological and chemical contaminants from drinking water. The potential of producing activated carbon (AC) from local agroforestry residues by single-step steam pyrolysis processes was investigated. The research aims to promote innovative use of local raw materials and relatively low-cost techniques in production of activated carbon. Four varieties of activated carbons from four different agroforestry residues, pine (Pinus contorta) cones (PC), Abies (Abies cilicica) seeds (AS), maple (Acer ginnala) seeds (MS) and peach (Prunus persica) stones (PS), were prepared and evaluated. The ACs were evaluated …
Financial-Linkages And Cost Efficiency: Lessons From Tanzanian Microfinance Cooperatives, Esther Ishengoma
Financial-Linkages And Cost Efficiency: Lessons From Tanzanian Microfinance Cooperatives, Esther Ishengoma
Business Management Review
This paper attempts to examine the effect of financial linkages on cost margin and efficiency of microfinance cooperatives (MCs) in Tanzania. Based on data from six focus group discussions comprising 112 managers from 102 MCs, the paper starts by exploring the nature of linkages between commercial banks and MCs. It further applies quantitative analyses: the stochastic frontier and semi-logarithm regression models to examine the effect financial linkages on cost efficiency and cost margin. The paper reveals that financial linkages increase cost margin and inefficiency of MCs. It therefore enlightens MCs ' stakeholders on the possible explanations of the positive effects …
University - Industry Linkage In Tanzania And Its Impact On Smes ' Development, Erasmus Shubi Kaijage
University - Industry Linkage In Tanzania And Its Impact On Smes ' Development, Erasmus Shubi Kaijage
Business Management Review
The objective of this study was to identify the level of interaction between Tanzanian universities and industry and to analyze the effectiveness of university-industry linkage in contributing to the development of industry and particularly of SMEs in Tanzania. The study was carried out in 2007 to investigate the relationship between universities and industry using the University of Dar es Salaam and Sokoine University of Agriculture as cases, and using a sample of thirty five businesses in Tanzania located in Dar es Salaam. Officials of government ministries and agencies were interviewed and policy documents were reviewed to determine the influence of …
Increasing The Competitive Strengths Of Tanzanian Tourism Firms-The Strategic Role Of Information Technology, Tumsifu Elly, Hakan Boter
Increasing The Competitive Strengths Of Tanzanian Tourism Firms-The Strategic Role Of Information Technology, Tumsifu Elly, Hakan Boter
Business Management Review
This study investigates the relationship between information technology (IT) and firms ' competitive advantage. A conceptual model hypothesizing the relationship between human and IT resources and their influence on firms ' capabilities and competitive advantage is conceived. Market and resource-based views are applied to investigate what differentiates firms ' performance as they deploy IT. Confirmatory factor analysis is used to validate the model and test the hypothesized relationships using 217 cases of SMTEs in Tanzania. The findings demonstrate that IT value depends on both IT and human resources. Industry-specific skills, knowledge and experience and managements ' skills, knowledge and experience …
Factors Influencing The Effectiveness Of Maintenance Of Construction Equipment, S. M. Mongomongo, Emmanuel A. M. Mjema
Factors Influencing The Effectiveness Of Maintenance Of Construction Equipment, S. M. Mongomongo, Emmanuel A. M. Mjema
Business Management Review
The objective of this study was to establish the factors influencing the effectiveness of maintenance of Construction Equipment (CE). The methodology used included literature review, observation, interviews, and questionnaire. The established factors influencing the effectiveness of maintenance of CE include: wrong perception of users of the effect of maintenance on productivity and on effectiveness of the machine; failure of the owners and users to comprehend the importance of outsourcing maintenance, which denies the companies the opportunity of using specialised expertise of OEM personnel trained in maintenance given that the companies have maintenance personnel with a low level of skills. Therefore …
The East African Community (Eac) And Its Influence On Tanzania's Manufactured Exports Intensity And Competitiveness, Deusdedit Rwehumbiza
The East African Community (Eac) And Its Influence On Tanzania's Manufactured Exports Intensity And Competitiveness, Deusdedit Rwehumbiza
Business Management Review
This paper examines the relationship between the revived EAC and both export intensity and competitiveness of Tanzania ' s manufactured exports in the East African region. The study uses simple descriptive statistics, which is later supplemented with export intensity and export competitiveness models (also termed as indices) to determine the dynamics and competitiveness of Tanzania ' s intra-EAC manufactured exports. Manufactured export intensity is above 100 whereas export competitiveness is found to have increased but below unit since the establishment of the current EAC. Concerted efforts should be taken within both, Tanzania and the EAC as a whole so as …
Illicit Trafficking Of Radioactive Sources: Experiences With Fake Materials In Tanzania, Iddi Mkilaha
Illicit Trafficking Of Radioactive Sources: Experiences With Fake Materials In Tanzania, Iddi Mkilaha
Tanzania Journal of Engineering and Technology (TJET)
Radioactive materials although are very useful, they are one of the catastrophic sources of mass destruction if misused. These materials have a number of positive uses which makes them very essential in our modern society. Incidences such as the bombings of the US Embassies in East Africa, the September 11, and many others had formed a basis for international responsive actions to control illicit trafficking of Radioactive and Nuclear Materials. The aim of this work is to track the movements and subsequently uses of these materials. Tanzania is one of the countries where International Nuclear Safeguards protocols are fully operational …
Flotation Circuit Performance Determination Using Size By Size Recovery – Case Of Bulyanhulu Gold Mine, Savinus Maronga
Flotation Circuit Performance Determination Using Size By Size Recovery – Case Of Bulyanhulu Gold Mine, Savinus Maronga
Tanzania Journal of Engineering and Technology (TJET)
The Bulyanhulu rougher flotation circuit performance has been determined by establishing the performance of individual cells. Direct sampling was done on all the rougher cell input, output and size analysis was performed on the samples with material in each size fraction assayed for copper and gold to determine their recoveries. It was observed that the performance of rougher cell number 3 and 4 was poor compared to other cells especially for finer particles below 53 µm where the recoveries were below 60%. In the last two flotation cells recoveries of both metals was very good (above 90%) in all particle …
Universal Design Of Transportation Systems: A Case Study Of Access And Mobility Of People With Disabilities At Selected Intersections In Dar Es Salaam, Nurdin Mushule
Tanzania Journal of Engineering and Technology (TJET)
The pedestrian facilities at intersections must be usable by pedestrians of all ages and capabilities. Intersections in particular must be designed to safely accommodate pedestrians of all ages and physical and mental abilities. Often, however, intersection designs fail to accommodate people with visual and mobility disabilities. In this regard, for pedestrians with disabilities, intersections can prove to be a challenge. Some of those challenges include provision of insufficient pedestrian clearance time due to use of inappropriate design pedestrian speed. Most importantly, the required facilities to enable People With Disabilities (PWD) to use the intersection without hindrance may be missing. Obstacles …
Optimized Production Of Lignin Peroxidase, Manganese Peroxidase And Laccase In Submerged Cultures Of Trametes Trogii Using Various Growth Media Compositions, F. Patrick, G. Mtui, A. M. Mshandete, A. Kivaisi
Optimized Production Of Lignin Peroxidase, Manganese Peroxidase And Laccase In Submerged Cultures Of Trametes Trogii Using Various Growth Media Compositions, F. Patrick, G. Mtui, A. M. Mshandete, A. Kivaisi
Tanzania Journal of Science
A white-rot fungus, Trametes trogii, was isolated from coastal Tanzania and screened for crude lignolytic enzymes production using Rhemazol Brilliant blue R (RBBR) dye, 2,2-azino-bis (3-ethylbenzthiazoline)-6-sulfonate (ABTS) and guaiacol in a semi-solid medium. Lignin peroxidase (LiP), manganese peroxidase (MnP) and Laccase (Lac) were detected by pyrogallol and !- napthol solutions, respectively on the guaiacol supplemented solid media. The effect of temperature, pH, carbon, nitrogen, Cu2+, 2,5-xylidine, ferulic acid, varatryl alcohol and Mn2+ in submerged culture fermentations were investigated for maximum enzymes production. After 7 days of incubation, 72-100% oxidation of RBBR, ABTS and guaiacol was observed. With optimized culture conditions, …
Effects Of Mulching, Fertilizer, Seeding And Seedling Treatments On Plant Species Recovery In Kondoa Irangi Hills, Tanzania, H. V. M. Lyaruu
Effects Of Mulching, Fertilizer, Seeding And Seedling Treatments On Plant Species Recovery In Kondoa Irangi Hills, Tanzania, H. V. M. Lyaruu
Tanzania Journal of Science
Fertilization, mulching, imported seed bank seeding and seedlings were applied to triplicates of 1m x1m plots at Chakwe and Gubali sites in Kondoa Irangi Hills, Tanzania. Responses tested were seedling recruitment, species turnover, species’ biomass, mortality of seedlings, total number of perennial and woody species recruited and leguminous species. There were high significant correlations of 0.85 and 0.87 between seedling recruitment and mortality in both sites, indicating that other factors, probably aridity, rather than prevailing site conditions were likely to be important determinants of mortality. Inorganic fertilization was not an efficient means of improving short-term productivity, seedling recruitment or increased …
Phylogenetic Relationships Of The Metazoan Parasites Of The Clariid Fishes Of Lake Victoria Inferred From Partial 18s Rdna Sequences, C. J. Mwita, G. Nkwengulila
Phylogenetic Relationships Of The Metazoan Parasites Of The Clariid Fishes Of Lake Victoria Inferred From Partial 18s Rdna Sequences, C. J. Mwita, G. Nkwengulila
Tanzania Journal of Science
Phylogenetic relationships among twenty two metazoan parasites recovered from seven species of clariid fish from Lake Victoria were analysed using partial 18S rDNA sequences. The 18S rDNA gene was amplified by polymerase chain reaction, directly sequenced, aligned and phylogenies inferred using maximum parsimony. Heuristic bootstrap MP searches yielded one most parsimonious tree (CI = 61%, HI = 39%), which showed that clariid parasites are monophyletic at higher taxonomic levels (Cestodea, Nematodea, Digenea and Crustacea). However the position of two trematodes (Allocredium mazoensis and Clinostomum sp.) and a nematode (Contracaecum sp.) were not stable. Despite the present findings, the study utilised …
Heavy Metal Levels In Paddy Soils And Rice (Oryza Sativa (L)) From Wetlands Of Lake Victoria Basin, Tanzania, J. F. Machiwa
Heavy Metal Levels In Paddy Soils And Rice (Oryza Sativa (L)) From Wetlands Of Lake Victoria Basin, Tanzania, J. F. Machiwa
Tanzania Journal of Science
A survey of paddy fields in Lake Victoria Basin (LVB) wetlands was conducted at a wider scale in different locations including closer to mining and within urbanized areas in Tanzania. The objective of the study was mainly to assess the present situation with regard to levels of heavy metals in O. sativa grains harvested locally as well as to set the baseline levels of some heavy metals in paddy fields. The results showed that the levels of Cadmium, Chromium, Copper, Lead, Zinc and total Mercury in brown rice are generally within the acceptable levels for human food. However, higher concentration …
Urban Dietary Heavy Metal Intake From Protein Foods And Vegetables In Dar Es Salaam, F. N. Ngassapa, O. C. Othman, E. Elisante
Urban Dietary Heavy Metal Intake From Protein Foods And Vegetables In Dar Es Salaam, F. N. Ngassapa, O. C. Othman, E. Elisante
Tanzania Journal of Science
Contamination of food and food products by heavy metals has made dietary intake as one of the major routes of these harmful elements to human beings. The human dietary intake of heavy metals cadmium, copper, lead and zinc from protein-foods (beans, meat, fish, milk) and green vegetables consumed daily from restaurants and street food-vendor kiosks in Dar es Salaam were determined using the Total Diet Study (TDS) method. The cooked food was bought from the restaurants and street food-vendors at several city locations (i.e. Buguruni, Manzese, Mwenge, Temeke and Ubungo) over several months and analyzed. Heavy metal concentrations were determined …
The Major Cause Of Observed Erosion Surge On The Beaches North Of Dar Es Salaam City, N. Nyandwi
The Major Cause Of Observed Erosion Surge On The Beaches North Of Dar Es Salaam City, N. Nyandwi
Tanzania Journal of Science
Surges in coastal erosion north of Dar es Salaam city have been documented from 1977 to the early 1980s and around 1997/98. Analysis of the wind data shows that the documented increase in coastal erosion coincided with increased wind speeds. Extreme winds in excess of 10-11 m s-1 were experienced during 1976-78, 1984 and after 1996. Their coincidence with extreme high tides produced the high erosion rates. Using beach profile data for the years 1998-2000 the evolution of the beach profile with the changing monsoon winds and sediment input by rivers could be demonstrated. The beach erosion took place during …
Geomorphological Potential Of Coelacanth Habitat Across Mozambique-Tanzania Border, N. Nyandwi
Geomorphological Potential Of Coelacanth Habitat Across Mozambique-Tanzania Border, N. Nyandwi
Tanzania Journal of Science
The coelacanth is a new fish in Tanzania. It was first discovered in September 2003 after it was spotted by a tourist in a fish market. It was caught by fishermen in the deep waters off Songo Mnara Island offshore of Kilwa Masoko Town in Southern Tanzania. The find potentially added southern Tanzania to the list of known coelacanth areas of the southern Western Indian Ocean Region. Observed current conditions indicate that the waters are swept by strong (2 m/sec) northward flowing current. This suggests that there must exist hideouts for the fish, such as caves in canyons and overhangs. …
Analysis Of Factors Affecting Technological Innovativeness In Engineering Enterprises In Tanzania, Emanuel Mjema
Analysis Of Factors Affecting Technological Innovativeness In Engineering Enterprises In Tanzania, Emanuel Mjema
Tanzania Journal of Engineering and Technology (TJET)
This paper discusses the technological innovativeness in engineering enterprises in Tanzania and analyses the factors affecting the innovativeness. It starts by analyzing various concepts regarding innovation, then analyzed from documentary review factors affecting innovativeness and then analyzed the innovativeness in Tanzanian enterprises. From the documentary review it was learnt that the following key factors influence technological innovativeness: Existence of innovation management; Existence of market to absorb the products of innovation; Existence of partnership between the universities and the firms; Existence of positive culture and politics towards innovation; The government playing its role to influence innovation; Existence of the right knowledge; …