Browsing by Title
Now showing items 16669-16688 of 35397
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Hydrogen Lyman-Alpha Periodicity Behaviour During Various Solar Cycles
(Springer, 2023)The temporal behaviour of various periodicities of hydrogen Lyman-alpha (Ly-α) between 1950 and 2020 have been anal ysed using Lomb-Scargle and Morlet wavelets spectral analysis techniques. Daily mean values of Ly-α radiance ... -
Hydrogen production by water electrolysis with an ultrathin anion-exchange membrane (AEM)
(ESG, 2018)A new ultrathin anion exchange membrane (AEM) is proposed for low cost AEM electrolysis. The advantages that thin membranes offer include reduced mass transport resistance and ohmic resistance. A membrane electrode ... -
Hydrogen production from a rectangular horizontal filter press Divergent Electrode-Flow-Through (DEFT™) alkaline electrolysis stack
(Elsevier, 2017)A membraneless Divergent Electrode-Flow-Through (DEFT™) alkaline electrolyser, for unlocking profitable hydrogen production by combining a simplistic, inexpensive, modular and durable design, capable of overcoming existing ... -
Hydrogen production from ammonia decomposition over a commercial Ru/Al2O3 catalyst in a microchannel reactor: experimental validation and CFD simulation
(Elsevier, 2016)In this work, an integrated experimental and CFD modelling technique was used to evaluate a microchannel reactor producing hydrogen from ammonia decomposition using a commercial Ru/Al2O3 catalyst. The microchannel reactor ... -
Hydrogen storage in aromatic carbon ring based molecular materials decorated with alkali or alkali-earth metals
(Journal of physical chemistry C, 2012)On the basis of first-principles calculations of molecular electron structure, we discuss the strategy of modifying the carbon-based materials in order to increase their capacity to bind with molecular hydrogen. In particular, ... -
Hydrogeological analysis of groundwater occurrence within the Limpopo Province
(North-West University (South Africa), 2020)Existing literature is reviewed to investigate what delineation methodologies on groundwater occurrence already exists and could be applied to specifically the Limpopo Province. Valuable lessons learned during this study ... -
The Hydrogeological Charaterization of Vegter Region 39 : Eastern Upper Karoo
(North-West University (South Africa), 2018)Over the past 50 to 60 years the Geological Survey and Department of Water and Sanitation (DWS) have carried out numerous local groundwater investigations as well as a number of regional surveys and studies. A large volume ... -
Hydrogeological modelling for future scenarios in the Far West Rand
(North-West University (South Africa), 2021)The Far West Rand (FWR) characterised by its karstified dolomites and dewatering related gold mining activities, extends along the Witwatersrand mining region. These mining activities have directly impacted the characteristics ... -
The hydrogeological relationship between recharge, abstraction and spring flow in the Zeerust dolomitic aquifer
(North-West University (South Africa), Potchefstroom Campus, 2015)Study area The study area centres on the newly developed Vergenoegd well field (VWF) on the farm Vergenoegd 60 JO west of Zeerust in the North West Province. The area is underlain by dolomiteswhich are part of the Malmani ... -
Hydrological assessment to predict velocity-flow classes in the lower Thukela River
(North-West University (South Africa), Potchefstroom Campus, 2017)This study investigates the use of a two-dimensional hydrodynamic model (River2D) to determine environmental flow requirements in the lower Thukela River, KwaZulu-Natal. A digital elevation model (DEM) was developed by ... -
Hydrological hazards in Vhembe district in Limpopo Province, South Africa
(AOSIS, 2018)This study determined the risks associated with hydrological hazards and vulnerabilities to communities in Vhembe District Municipality, Limpopo province. Risk and vulnerability contribute to poverty, loss of lives and ... -
The hydrological impact of the rewatering of the Gemsbokfontein dolomitic compartment on the Wonderfonteinspruit
(North-West University, 2004)Water is an essential resource for any life on earth but water is also the most poorly managed of all resources. Many countries are facing a water crisis and South Africa is no exception. The dolomitic groundwater ... -
Hydrological Modelling of the Rietvlei Wetland, Western Cape, South Africa : Identifying possible Environmental Impacts
(North-West University (South Africa), 2020)Conceptualizing the hydrological processes governing wetland environments is only possible when the defining attributes of the wetland are considered and understood. In this case, the groundwater level fluctuations, wetland ... -
Hydrothermal preparation of biochar from spent coffee grounds, and its application for the removal of cadmium from coal tailings leachate
(SAIMM, 2019)Spent coffee grounds were transformed into biochar using a hydrothermal method. Some of the biochar product was pre-treated through surfactant impregnation with sodium dodecyl sulphate (SDS) to enhance its adsorption ... -
Hydrothermal synthesis, characterization and adsorption testing of MoS2-Zeolite for the removal of lead in an aqueous solution
(EARET, 2018)The shortage of water can be worsened by the pollution of limited water resources by industrial activities such as mining which contribute to significant level of toxic heavy metals in the environments. Heavy metals ... -
The hydrotreatment of an unsaturated fatty acid vegetable oil to hydrocarbons over Ni/SiO2-Al2O3
(ETA-Florence Renewable Energies, 2015)In this study, sunflower oil was hydrotreated in the presence of a nickel catalyst with the objective to evaluate the effect of reaction parameters on the characteristics of the reaction product. The effect of reaction ... -
Hymn singing in Sesotho/Setswana/Sepedi speaking churches: a process of claiming and reclaiming
(Taylor & Francis, 2013)Hymn singing is an early example of cross-cultural pollination – what had been taken away from the natives by the missionaries, was reclaimed in the adaptation of old European hymns and the composition of new traditional ... -
The Hyogo framework for action and its implications for disaster management and reduction in Africa
(AOSIS OpenJournals, 2010)At the World Conference on Disaster Reduction, Hyogo, Japan, in January 2005, the international community adopted a 10-year plan to make the world safer from disasters. The resultant Hyogo Framework for Action is the global ... -
Hypercoagulation and hyperkinetic blood pressure indicative of physiological loss-of-control despite behavioural control in Africans: the SABPA study
(Taylor & Francis, 2016)Objectives: A dissociation between behavioural (in-control) and physiological parameters (indicating loss-of-control) is associated with cardiovascular risk in defensive coping (DefS) Africans. We evaluated relationships ... -
Hypercontextualized learning games: fantasy, motivation, and engagement in reality
(Sage, 2013)A Hypercontextualized Game (HCG) is a locally designed game that supports its players in gathering context-specific information and in-depth understanding and knowledge regarding the context of a site. LIEKSAMYST, an ...