Zobrazeno 1 - 10 of 12 pro vyhledávání: '"Willem de Beer"'
1
25RENEWABLE ENERGY: THE CATALYST FOR A SUSTAINABLE ENERGY DISTRIBUTION SECTOR IN SOUTH AFRICA
Autor: Mvuleni Bukula, Brink Botha, Deon Els, Willem de Beer
Publikováno v: Journal of Natural and Applied Sciences. 5:25-38
The purpose of this article, with practical focus, is to analyse the potential of Renewable Energy (RE) as the catalyst for a sustainable energy distribution sector in South Africa (SA) and promote collaboration between the manufacturers, government,
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3f377ab01b9075c438b8fdd364b07196
https://doi.org/10.53974/unza.jonas.5.1.712
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5
Mapping cave front growth utilising the collective behaviour of seismicity and velocity fields
Autor: Doug Angus, Gisela Viegas Fernandes, Ted Urbancic, Willem de Beer, Katherine Bosman
Publikováno v: Proceedings of the Fourth International Symposium on Block and Sublevel Caving.
In many block caving operations, the expansion and growth of the cave involves an examination of the distribution of seismicity both spatially and temporally around the cave itself. These approaches utilise event density as a proxy to define the volu
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a427013327ef39da4f449a116d1332d0
https://doi.org/10.36487/acg_rep/1815_45_urbancic
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6
Towards physics-based hazard assessment tools for developing blanket re-entry rules
Autor: Gisela Viegas Fernandes, Katherine Bosman, Lindsay Smith-Boughner, Doug Angus, Willem de Beer
Publikováno v: Proceedings of the Fourth International Symposium on Block and Sublevel Caving.
Hazard assessment tools are often classified as either purely probabilistic or deterministic. Probabilistic assessments utilise the statistics of past occurrences to attempt a forecast, with suitable confidence levels, of future occurrences in a give
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::84dc93bdff4f7bc2f2bd7c65101bfea0
https://doi.org/10.36487/acg_rep/1815_42_de_beer
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7
Evolution of a block cave from time-lapse passive source body-wave traveltime tomography
Autor: J. Mercier, Willem de Beer, Jean-Pascal Mercier, Simon Morris
Publikováno v: GEOPHYSICS. 80:WA85-WA97
Most underground mines are equipped with microseismic monitoring systems that allow the detection, location, and characterization of microseismic events. Microseismic events can be exploited to understand the rock mass response to mining. However, se
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c3053c7ad7af8a9ea79e9a5c426288f5
https://doi.org/10.1190/geo2014-0155.1
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8
Beyond coloured balls ‒ making sense of large volumes of microseismic data with diverse source mechanisms
Autor: Willem de Beer, Véronique Falmagne, J. Mercier, Jose Ardito
Publikováno v: Proceedings of the Sixth International Seminar on Deep and High Stress Mining.
The central theme of this analysis is the study of seismic response of the rock mass before and after the occurrence of a moment magnitude 2.0 seismic event that occurred in December 2010 at the San Rafael Mine sublevel open stoping operation located
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f872bab44006e97786c4a48f9defb185
https://doi.org/10.36487/acg_rep/1201_10_debeer
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9
Measuring Hydraulic Fracture Growth in Naturally Fractured Rock
Autor: Andre van As, Xi Zhang, Eduard Siebrits, Brice Lecampion, Zuorong Chen, Marc Mainguy, Willem de Beer, Robert G. Jeffrey, Andrew P. Bunger, Marc Thiercelin, John Wesley Dudley, David P. Allison
Publikováno v: All Days.
A field experiment was carried out to measure hydraulic fracture growth in naturally fractured rock. Hydraulic fracture interactions with pre-existing natural fractures, shear zones, veins, and adjacent hydraulic fractures were measured and mapped du
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::23cd6de596978764bc98098aa8d4b5a5
https://doi.org/10.2118/124919-ms
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10
Superinvolutions on super-Riemann surfaces and the supergeometry of type-I superstrings
Autor: Willem de Beer, João P. Rodrigues, André van Tonder
Publikováno v: Physics Letters B. 248:67-72
The supergeometry appropriate to the perturbation theory of type-I superstrings is described, to arbitrary loop order, by means of a superinvolution on a closed super-Riemann surface. It is known that the superfields of relevant local U(1) weights re
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::163853b755c5cd0419e6c5c61fae1bed
https://doi.org/10.1016/0370-2693(90)90016-y
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