Willem de Beer

Willem de Beer
ESG Solutiotions

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10
Publications
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27
Citations
Citations since 2016
0 Research Items
10 Citations
20162017201820192020202120220.00.51.01.52.02.53.0
20162017201820192020202120220.00.51.01.52.02.53.0
20162017201820192020202120220.00.51.01.52.02.53.0
20162017201820192020202120220.00.51.01.52.02.53.0

Publications

Publications (10)
Article
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, seismicity provides information only for regions that are seismically active. Although some informatio...
Article
Geotechnical and seismic monitoring systems play an important role in mining. Advances in automated logging have simplified the data acquisition process. Unfortunately, automated data acquisition almost always implies that large volumes need to be analysed. This is often the weak link, mainly because it is difficult to maintain consistency in pract...
Article
We present aspects of one of several ongoing case studies used in the development of prediction techniques for major seismic instabilities. The current investigation centres on accelerated coseismic deformation described by the kinematics of failure and on softening, as well as the characterization of areas of interest by measures of the seismic re...
Article
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 restricted to be even under the superinvolution reproduce the required type-I superstring boundary con...
Article
The scalar superdeterminant on a super Riemann surface (SRS) with boundaries is related to the scalar superdeterminant on the SRS associated with its double for even spin structures. One is then able to relate an arbitrary multiloop contribution to the partition function of the Type-I superstring to a corresponding Type-II superstring contribution.
Article
It is established that, apart from a function of the period matrix of the double of the surface, the open bosonic string integrand at an arbitrary order of string perturbation theory is the modulus squared of a necessarily complex function of real moduli coordinates and that no surface terms contribute to any obstruction to this factorization. This...
Article
It is explained how Neumann boundary conditions still lead to the mixed boundary conditions required to calculate the functional determinants in the Polyakov model. Neumann boundary conditions on the conformal factor are obtained, thereby negating the need for a finite counterterm in the quantum bare action.
Article
This final report on the SIMRAC project GAP409 presents a method (SOOTHSAY) for predicting larger mining induced seismic events in gold mines, as well as a pattern recognition algorithm (INDICATOR) for characterising the seismic response of rock to mining and inferring future behaviour. The pattern recognition algorithm codifies and quantifies prev...
Article
Cover title. Thesis (M.S.)--University of Witwatersrand, 1988. Includes bibliographical references. "CNLS-88-10."

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