Browsing Research Articles [MEWES] by Title
Now showing items 398-417 of 462
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Structure and properties of molecular and ionic clusters in vapour over caesium fluoride
(Taylor & Francis Online, 2015-02-11)The properties of neutral molecules Cs2F2, Cs3F3, and Cs4F4, and positive and negative cluster ions Cs2F+, CsF2−, Cs3F2+, Cs2F3−, Cs4F3+, and Cs5F4+ were studied by several of quantum chemical methods implementing density ... -
Structure and thermodynamic properties of positive and negative cluster ions in saturated vapour over barium dichloride
(Taylor & Francis online, 2013-03-13)Geometrical structure, vibration spectra, and enthalpies of dissociation have been investigated for the ions BaCl3−, Ba2Cl3+, Ba3Cl5+, and Ba4Cl7+ which were detected earlier in the saturated vapour over BaCl2. Quantum ... -
Structure and vibrational spectra of cluster ions over rubidium iodide by computational chemistry
(IEEE, 2015-03-05)The properties of Rb 2 I + , RbI 2 - , Rb 3 I 2 + and Rb 2 I 3 - ions were studied using two quantum chemical methods, DFT and Møller-Plesset perturbation theory of the 2 nd order. The effective core potential with Def2-QZVP ... -
Study of interaction of chitosan with Fluoride
(Biointerface Research in Applied Chemistry, 2018-06-15)Interaction of chitosan with fluoride (F- ) has been studied using experimental and computational methods. Chitosan was extracted from prawns shells and modified by cross-linking with glutaraldehyde and protonation using ... -
A study on Pb removal kinetics using modified agricultural wastes from Tanzania
(Springer Nature Switzerland AG., 2020-10-29)Lignocellulosic materials, abundant and renewable materials, are gaining popularity as metal scavenging agents because of their high sorption capacities, relatively low cost and environmental-friendliness. However, there ... -
Sub- and Supercritical Water Gasification of Rice Husk: Parametric Optimization Using the I-Optimality Criterion.
(ACS Publications, 2021-05-18)In this study, rice husk biomass was gasified under sub- and supercritical water conditions in an autoclave reactor. The effect of temperature (350-500 °C), residence time (30-120 min), and feed concentration (3-10 wt %) ... -
Suitability of selected vegetable tannins traditionally used in leather making in Tanzania
(Elsevier Ltd., 2020-04-01)The use of chromium salt has dominated in tanning industry worldwide due to its high versatility in quality leather production. However, Environmental concerns of chromium have shifted the interest of current research to ... -
Supersalts Na2AlX5 (X = F, Cl): Quantum Chemical Study of the Structure, Vibration Spectra and Thermodynamic Properties
(Current Journal of Applied Science and Technology, 2017-06-27)Theoretical investigation, prediction and design of novel supersalts Na2AlX5 (X = F, Cl) have been performed. The formation of the supersalts was considered through association reactions between different building blocks: ... -
A survey of irrigation water and soil quality that likely impacts paddy rice yields in Kilimanjaro, Tanzania
(Springer Nature Switzerland AG., 2021-11-29)In this study, the impacts of irrigation water quality and soil characteristics on paddy rice yields were investigated. Standard spectroscopy and spectrometry methods were used to analyze irrigation water and irrigated ... -
Sustainable biofuel production in Sub-Saharan Africa: Exploring transesterification process, nonedible feedstocks, and policy implications
(WIREs, 2024-05-10)The world is currently dealing with an energy crisis, primarily due to heavy reliance on finite fossil fuels and the associated rise in energy demand. In response to this crisis, replacing heavy reliance on finite fossil ... -
Synthesis and characterization of micrometer-sized silica aerogel nanoporous beads
(Elsevier, 2012-08-15)Here we report the preparation of micrometer-sized highly nanoporous, relatively trasperant silica aerogel beads with high surface area as well as large pore volume with sizes ranging from 165 to 395 μm. The wet micrometer-sized ... -
Synthesis and FTIR Characterization of Mg-Hydroxylapatite Derived from Dolostone with High Dolomite Mineral Content
(University of Dar es Salaam, 2020-08-24)We present the synthesis of magnesium-substituted hydroxylapatite starting from locally available dolostone. The apatite was prepared by a reaction between heat pre-treated dolostone powder with phosphoric acid, maintained ... -
Synthesis of mesoporous silica with superior properties suitable for green tire
(Elsevier, 2012-09-25)In this article we report synthesis of mesoporous silica with superior properties for application in green tire (environmentally friendly tire) as filler. The synthesis was done using a newly innovated apparatus which ... -
Tackling soil degradation and environmental changes in Lake Manyara Basin, Tanzania to support sustainable landscape/ecosystem management.
(EGU General Assembly Conference Abstracts, 2017-04)The Lake Manyara Basin (LMB), which encompasses Lake Manyara National Park a world ranking World Biosphere Reserve, is of great ecological and socio-economic value because it hosts a small-holder rain fed and extensive ... -
Tamarindus Indica fruit shell ash: a low cost and effective catalyst for biodiesel production from Parinari curatellifolia seeds oil
(Springer Nature Switzerland AG., 2019-02-21)The study evaluated the potential use of agricultural waste, Tamarindus indica fruit shell ash, as a solid base catalyst for production of biodiesel. The catalyst was prepared by calcination of T. indica fruit shell at ... -
Tanning capacity of Tessmannia burttii extracts: the potential eco-friendly tanning agents for the leather industry
(2021-05-15)In the present study, the tannins from stem and root barks of Tessmannia burttii Harms (Caesalpiniaceae), a plant species abundantly growing in Tanzania and other parts of Africa, were investigated for their suitability ... -
Techno-economic evaluation of transesterification processes for biodiesel production from low quality non-edible feedstocks: Process design and simulation
(ELSEVIER, 2024-06-15)The global demand for fossil fuels has led to increased pollutant emissions and depleted fossil fuel resources. Biodiesel, a fossil fuel alternative, is widely produced via transesterification. This study assesses the ... -
Textile wastewater treatment in anaerobic reactor: Influence of domestic wastewater as co-substrate in color and COD removal
(Elsevier, 2022-10-28)Treatment of textile wastewater with domestic wastewater as co-substrate was investigated in this study. Combined textile and domestic wastewater at different mixing ratios (100:0, 80:20, 60:40) was treated under anaerobic ... -
Theoretical and Experimental Performance Analysis of a Novel Domestic Biogas Burner
(Hindawi, 2020-09-16)The inefficient indoor burning of fuelwood on traditional cookstoves generates pollutants, primarily carbon monoxide and many other human health-damaging emissions. It is from this risk that it is necessary to have an ... -
Theoretical Design of Complex Molecule via Combination of Natural Lawsone and Synthetic Indoline D131 Dyes for Dye Sensitized Solar Cells Application
(Scientific Research Publishing Inc., 2018-10-31)The dye sensitized solar cells (DSSCs) have been extensively studied due to their low production cost and simple fabrication process. Dye co-sensitization broadens the absorption spectrum of the sensitizer; thus enhances ...