Browsing Research Articles [MEWES] by Issue Date
Now showing items 101-120 of 474
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Interactions Between Sodium Ion and Constituents of Chitosan: DFT Study
(Science Publishing Group, 2015-09-03)Glucosamine and acetylglucosamine are the constituents of chitosan and chitin natural biopolymers. In the present study, the structure and properties of the D-glucosamine monomer (A), N-acetylglucosamine monomer (B), and ... -
Assessment of agrochemical residues in wastewater from selected horticultural farms in Arusha, Tanzania
(International Journal of Environmental Sciences, 2015-09-07)Arusha region in Tanzania has been involved for quite some time on commercial horticulture. The use of agrochemicals results to increased crop productivity and consequently offers farmers major economic returns. However, ... -
Vibrational and Electronic Spectra of Natural Dyes Constituents for Solar Cell Application: DFT and TDDFT Study
(Science Publishing Group, 2015-09-09)Selected constituents of natural dyes, phenol, 1,2-benzoquinone, 1,4-benzoquinone, 1,4-naphthoquinone, and 9,10-anthraquinone have been studied theoretically using the density functional theory and time-dependent density ... -
Review of the stability of biodiesel produced from less common vegetable oils of African origin
(South African Journal of Science, 2015-09-25)The stability of biodiesel is dependent on storage conditions such as contact with ambient air and metals, exposure to sunlight and high temperature conditions which accelerate oxidation reactions. In addition, biodiesels ... -
Influence of metal contaminants and antioxidant additives on storage stability of biodiesel produced from non-edible oils of Eastern Africa origin (Croton megalocarpus and Moringa oleifera oils)
(Elsevier Ltd., 2015-10-15)The effect of metal contents and antioxidant additives on the storage stability of biodiesel produced from less common non-edible oils of Eastern Africa origin (Croton megalocarpus and Moringa oleifera) were evaluated and ... -
Molecular and Ionic Clusters of Rubidium Fluoride: Theoretical Study of Structure and Vibrational Spectra
(Science Publishing Group, 2015-10-19)In this study, the geometrical structure and vibrational spectra of the trimer molecule Rb3F3 and ionic clusters Rb2F + , RbF2 – , Rb3F2 + , and Rb2F3 – were studied by density functional theory (DFT) with hybrid ... -
Theoretical Study of the Interaction between Chitosan Constituents (Glucosamine and Acetylglucosamine Dimers) and Na+ Ions
(Open Access Library Journal, 2015-10-30)The interaction of dimers of glucosamine and acetylglucosamine molecules with sodium ion has been studied using the DFT/B3LYP approach. The optimization of geometrical parameters and vibrational spectra calculations were ... -
The need to enforce minimum environmental flow requirements in Tanzania to preserve estuaries: case study of mangrove-fringed Wami River estuary
(Elsevier, 2015-11-01)The importance of restoring and maintaining environmental flows for sustaining the ecosystem integrity of rivers has been recognized in policies and legal frameworks in many countries. However this is routinely not implemented ... -
Extracts from field margin weeds provide economically viable and environmentally benign pest control compared to synthetic pesticides
(Public Library of Science, 2015-11-23)Plants with pesticidal properties have been investigated for decades as alternatives to synthetics, but most progress has been shown in the laboratory. Consequently, research on pesticidal plants is failing to address gaps ... -
Decentralized Environmental Governance: A reflection on its role in shaping Wildlife Management Areas in Tanzania
(Tropical Conservation Science, 2015-12-01)Decentralised environmental governance has become a catchy solution to environmental problems caused by the failure of traditional centralised environmental governance. It promises to transfer power and authority, improve ... -
Complex Hydrides Li2MH5 (M = B, Al) for Hydrogen Storage Application: Theoretical Study of Structure, Vibrational Spectra and Thermodynamic Properties
(Science Publishing Group, 2015-12-18)Gaseous lithium complex hydrides Li2MH5 (M = B, Al) have been studied using DFT/B3P86 and MP2 methods with 6-311++G(d,p) basis set. High content of hydrogen by these materials accord them with good candidacy as a class of ... -
Theoretical Study of Structure and Vibrational Spectra of Molecular and Ionic Clusters Existing in Vapour over Rubidium Chloride
(Science Publishing Group, 2015-12-22)The geometrical structure and the vibrational spectra of dimer Rb2Cl2, trimer Rb3Cl3, tetramer Rb4Cl4 molecules and heptaatomic Rb4Cl3+, Rb3Cl4– ions were studied. The cluster molecules and ions had been detected in ... -
Comparative Study of Pb2+ Removals and Isotherms by Physically - and Chemically - Modified Agro - Wastes from Tanzania
(Gwangju Institution of Science and Technology, 2016)Materials and Methods Raw corn and rice husk were washed several times using DIW to remove extraneous dirt and contaminants. The husks were then dried at 110 ºC overnight to remove moisture. Dried husks were then ground ... -
Overview of feed resources condition and feeding practices among the smallholder dairy farmers in Tanzania
(RUFORUM Working Document Series, 2016)In Tanzania, most smallholder dairy farmers rely on on-farm resources for feeding their livestock. These on-farm feed resources include grasses, legumes, crop residues, cereals and oilseed byproducts. These feed resources, ... -
Performance of water filters towards the removal of selected pollutants in Arusha, Tanzania.
(University of Dar es Salaam, 2016)This paper presents the findings of a study carried out to investigate the efficiency of selected common water filters in the removal of Escherichia coli, organic matter and fluoride. Additionally, the Total Suspended ... -
Impact of Antioxidant Additives on the Engine Performance and Exhaust Emissions Using Biodiesel made from Jatropha Oil of Eastern Africa Origin
(Journal of the South African Institution of Mechanical Engineering, 2016)Biodiesel’s chemical nature makes it more susceptible to oxidation in comparison to mineral diesel. Biodiesels are doped with antioxidants to increase oxidation stability for long term storage. However, it is quite ... -
Investigation of Aloe lateritia Gel as Corrosion Inhibitor for Mild Steel in 2 M HNO3 and 1 M H2SO4 Media
(Scientific Research, 2016-01-15)Corrsion inhibition of Aloe lateritia gel for Mild steel in 2 M HNO 3 and 1 M H 2 SO 4 solutions was in- vestigated by potentiodynamic polarization, Scanning electron microscopy (SEM) and Foutier transform infrared ... -
Assessment of sources and transformation of nitrate in groundwater on the slopes of Mount Meru, Tanzania
(Springer, 2016-01-25)The stable isotope compositions of nitrogen-nitrate (15N-NO3) and oxygen-nitrate (18O-NO3), and concentration of nutrients (NO3- NH4+, NO2 -, PO4 3- ) for water samples collected from springs, shallow wells and boreholes ... -
The Potential of Common Beneficial Insects and Strategies for Maintaining Them in Bean Fields of Sub Saharan Africa
(Scientific Research Publishing, 2016-02-10)Beneficial insects provide natural ecosystem services such as biological control of pests, soil for mation, nutrient cycling and pollination of plants. Beneficial insects include pollinators important in the essential ... -
Heavy Metals Contamination in Agricultural Soil and Rice in Tanzania: A Review
(Science Publishing Group, 2016-02-17)Heavy metals contamination in agricultural soil is a potential environmental threat to the safety of agricultural food crops such as rice which is consumed by majority of Tanzanians. The aim of this review is to put ...