Now showing items 1-10 of 1154
Physical property behaviour of North Dakota lignite in an oxygen/steam blown moving bed gasifier
In this study lignite originating from North Dakota (USA) was thermally treated in an oxygen/steam blown commercial-scale moving bed gasifier operating on lump coal at the Dakota Gasification Company (DGC) in order to ...
State space model extraction of thermohydraulic systems Part II: a linear graph approach applied to a Brayton cycle–based power conversion unit
This second paper in a two part series presents the application of a developed state space model extraction methodology applied to a Brayton cycle-based PCU (power conversion unit) of a PBMR (pebble bed modular reactor). ...
The impact of particle size and maceral segregation on char formation in a packed bed combustion unit
Highveld parent coal was crushed into three size fractions, namely: 5 mm–75 mm, 5 mm–53 mm, and 5–37.5 mm. The crushed samples were subjected as feed coals to heating in a packed-bed reactor to investigate the influence ...
A versatile energy management system for large integrated cooling systems
Large, energy intensive cooling systems are found on deep level mines to supply chilled service water and cool ventilation air to the mine. The need exists for a simple, real-time energy management tool for large, integrated ...
Improved reactivity of large coal particles by K2CO3 addition during steam gasification
In this study, the excess solution impregnation method was used to impregnate large coal particles (5 and 10 mm) with K2CO3, and the effect of the additive on steam gasification reactivity was investigated. A washed bituminous, ...
The Spoken Web Search task at Mediaeval 2012
(Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International Conference on, 2013)
In this paper, we describe the “Spoken Web Search” Task, which was held as part of the 2012 MediaEval benchmark evaluation campaign. The purpose of this task was to perform audio search with audio input in four languages, ...
Case study: the effects of a variable flow energy saving strategy on a deep-mine cooling system
Cooling systems consume up to 25% of the total electricity used on deep level mines. These systems are integrated with the water reticulation system to provide chilled service water to the mine as well as cooling for mine ...
West Africa - a safe haven for frogs? A sub-continental assessment of the Chytrid Fungus (Batrachochytrium dendrobatidis)
(Public Library of Science, 2013)
A putative driver of global amphibian decline is the panzootic chytrid fungus Batrachochytrium dendrobatidis (Bd). While Bd has been documented across continental Africa, its distribution in West Africa remains ambiguous. ...
Effect of ozone on photosynthesis and seed yield of sensitive (S156) and resistant (R123) Phaseolus VulgarisL. genotypes in open-top chambers
Rising tropospheric ozone (O3) concentrations have been identified as a significant threat to crop production. In the present study two snap bean (Phaseolus vulgaris L.) genotypes with known difference in sensitivity to ...
Public administration in the Democratic Republic of Congo
(Taylor & Francis, 2013)