Browsing Conference Papers by Author "10092390 - Beukes, Johan Paul"
Now showing items 1-6 of 6
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A comparison of surface NO2 mixing ratios and total column observations at a South African site
Josipovic, Micky; Burger, Roelof P.; Thompson, Anne M.; Beukes, Johan P.; Van Zyl, Pieter G.; Venter, Andrew D.; Jaars, Kerneels; Laakso, Lauri (SASAS, 2014)The total column density nitrogen dioxide (NO2) retrievals collated by a ground-based sun-tracking spectrometer (Pandora/GSFC) and the satellite-borne (Aura) Ozone Monitoring Instrument (OMI) were compared to the volume ... -
Estimating the concentration of nucleation mode aerosol particles over South Africa using satellite remote sensing measurements
Sundström, A.-M.; Laakso, L.; Beukes, J.P.; Van Zyl, P.G.; Josipovic, M.; Venter, A.D.; Jaars, K.; Pienaar, J.J.; Piketh, S.; Chiloane, E.K. (AIP Publishing, 2013)In this work satellite based observations were used to estimate the concentration of nucleation mode aerosols over South Africa. The nucleation mode aerosols can not be detected directly with satellite instruments since ... -
The influence of CaC03 addition and clay binder selection on electricity efficiency and other operational aspects during pre-reduction of pelletised chromite
Beukes, J.P.; Neizel, B.W.; Kleynhans, E.L.J.; Van Zyl, P.G.; Dawson, N.F. (2013)Production of ferrochrome is an energy intensive process. Pelletised chromite pre-reduction is most likely the ferrochrome production process with the lowest specific electricity consumption, i.e. MWh/t ferrochrome ... -
Spatial and temporal assessment of atmospheric OC and BC concentrations at South African debits sites
Maritz, Petra; Beukes, J. Paul; Van Zyl, Pieter G.; Conradie, Engela H.; Galy-Lacaux, Corinne; Liousse, Cathy (SASAS, 2014)The baseline of uncertainty in aerosol radiative forcing is large and depends on aerosol characteristics (e.g. size and composition), which can vary significantly on a regional scale. Sources (natural, anthropogenic and ... -
A systems engineering approach for the deployment of an atmospheric monitoring station
Venter, A.D.; Stoker, P.W.; Fick, J.I.J.; Vakkari, V.; Van Zyl, P.G.; Beukes, J.P.; Laakso, L. (Wiley, 2014)In this paper the importance of a Systems Engineering (SE) approach is reiterated for developing and managing an atmospheric monitoring station. A newly established comprehensive atmospheric monitoring station, the Welgegund ... -
Theoretical and practical aspects of Cr(VI) in the South African ferrochrome industry
Beukes, J.P.; Van Zyl, P.G.; Dawson, N.F. (SAIMM, 2010)The production of ferrochrome alloy from chromium bearing chromite ores is conducted at high temperature under highly reducing conditions. However, albeit completely unintended, it is impossible to completely exclude ...