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  • Kleynhans, W; Salmon, BP; Olivier, JC; Van den Bergh, F; Wessels, Konrad J; Grobler, T (IEEE Xplore, 2012-07)
    There has been recent developments in the use of hypertemporal satellite time series data for land cover change detection and classification. Recently, an Autocorrelation function (ACF) change detection method was proposed ...
  • Kleynhans, W; Olivier, JC; Wessels, Konrad J; Salmon, BP; Van den Bergh, F; Steenkamp, K (IEEE, 2011-05)
    A method for detecting land cover change using NDVI time-series data derived from 500-m MODIS satellite data is proposed. The algorithm acts as a per-pixel change alarm and takes the NDVI time series of a 3 × 3 grid of ...
  • Kleynhans, W; Salmon, BP; Olivier, JC (Elsevier, 2015-10)
    Recent times have seen a significant increase in the amount of readily available SAR data, with many current and historic SAR data holdings now adopting an open distribution policy. As more regular SAR observations are ...
  • Kleynhans, W; Salmon, BP (IEEE, 2014-07)
    The detection of new informal settlements in South Africa using time-series data derived from coarse resolution satellite imagery has recently been an active area of research. Most of the previous methods presented using ...
  • Uys, H; Biercuk, M; Britton, JW; Van Devender, AP; Bollinger, JJ (SAIP 2010, 2010-09)
    This article reports on a calibrated measurement of 174 Yoctonewton using a cloud of 60 9 Be+ ion confined in a Penning ion trap. These measurements suggest that ion traps may form the basis of a new class of ultrasensitive ...
  • Lemmer, Yolandy; Thanyani, ST; Vrey, PJ; Driver, CHS; Venter, L; Van Wyngaardt, S; Ten Bokum, AMC; Ozoemena, KI; Pilcher, LA; Fernig, DG; Stoltz, AC; Swai, HS; Verschoor, JA (Elsevier, 2009)
    Antibodies to mycolic acid (MA) antigens can be detected as surrogate markers of active tuberculosis (TB) with evanescent field biosensors where the lipid antigens are encapsulated in liposomes. Standard immunoassay such ...
  • Lamprecht, GH; Human, HGC; Snyman, LW (Elsevier Science B.V, 2007-10)
    The viability of using pulsed laser excited Raman spectroscopy as a method for diamond detection from ore, has been investigated. In this method the spontaneous Stokes Raman signal is used as indicator of diamond, and a ...
  • Genthe, Bettina; Gericke, M; Bateman, B; Mjoli, N; Kfir, R (Pergamon-Elsevier Science Ltd, 1995)
    Gene probes developed locally for both enteric Adenoviruses 40 and 41 were used to determine whether these viruses were present in both raw and treated waters. Approximately sixty water samples were concentrated by ultra ...
  • Steenkamp, CM; Dickenson, GD; Nortje, AC; Rohwer, EG; Du Plessis, A (SAIP 2010, 2010-09)
    Twenty rovibronic transitions of the e(v'=5)-X(v''=0) band of the 12C16O which experimental wavelengths were previously unavailable were recently detected by vr induced fluorescence excitation spectroscopy. The data is ...
  • Olivier, JC; Araya, ST; Wessels, Konrad J (18th Annual Symposium of the Pattern Recognition Association of South Africa (PRASA), 2007-11)
    An Artificial Neural Network (ANN) is proposed to detect human-induced land cover change using a sliding window through a time-series of Moderate Resolution Imaging Spectroradiometer (MODIS) satellite surface reflectance ...
  • Moriya, H; Naoi, M; Nakatani, M; Murakami, O; Kgarume, T; Ward, AK; Durrheim, R; Philipp, J; Yabe, Y; Kawakata, H; Ogasawara, H (The Japanese Society for NDI, 2012-11)
    The ability to predict rock failure is desirable for the prevention of disasters in mines. The acoustic emission (AE) method is a well-known tool for monitoring fracture growth in rock masses that is used to help ensure ...
  • Keaikitse, M; Brink, W; Govender, N (2012-10)
    Object detection is an essential first stage in a surveillance system, primarily because it focuses all the subsequent processes. The standard approach to object detection is background subtraction. At the core of ...
  • Kfir, R; Burger, JS; Idema, GK (Pergamon-Elsevier Science Ltd, 1993)
    Three bays along the South African coast were studied for the presence of Salmonella spp in seawater, effluent and storm water discharges into the bays and in shellfish harvested at the same sites. The microbial quality ...
  • Theron, Andre; Engelbrecht, Jeanine; Kemp, J; Kleynhans, Waldo; Turnbull, T (Institute of Electrical and Electronics Engineers (IEEE), 2017-06)
    Sinkholes are an unpredictable geohazard that endanger life and property in dolomitic terrains. Sinkholes are a significant threat in Gauteng, South Africa’s most populated and urbanized province. Small-scale surface ...
  • Van Schoor, Abraham M (Elsevier Science BV, 2002-07)
    Sinkholes in dolomitic areas are notoriously difficult geophysical targets, and selecting an appropriate geophysical solution is not straightforward. Electrical resistivity imaging or tomography (RESTOM) is well suited to ...
  • Kruszewska, KJ; Du Cann, VM (Butterworth-Heinemann Ltd., 1996-05)
    Two petrographic methods, namely long-wave fluorescence intensity measurements and a vitrinite elasticity index were developed and used to detect incipient oxidation in coals subjected to simulated weathering conditions. ...
  • Theron, J; Cilliers, Jacques E; Du Preez, M; Brozel, VS; Venter, SN (Blackwell Science Ltd, 2000-09)
    A pit-stop semi-nested PCR assay for the detection of toxigenic Vibrio cholerae in environmental water samples was developed and its performance evaluated. The PCR technique amplifies sequences within the cholera toxin ...
  • Thirlwall, JT (American Institute of Physics, 1998-11)
    The recognition of small features of low contrast in the image recorded by an x-ray image intensifier is usually limited by photon noise. This detail-contrast perceptibility is dependent on the detective quantum efficiency ...
  • Hecker, GFK; Van Zyl, MN; Wainwright, EJ; Goosen, P; Heydenrych, C (1997-09)
    The introduction of new factors of safety for winding ropes is accompanied with codes of practice for the design, operation and maintenance of winders and for the condition assessment of winder ropes. The studies undertaken ...
  • Van Zyl, MN (1997-11)
    This volume 2 of the GAP 324 report discusses the parts of the project that dealt with the sinking of very deep shafts, and an initial study into the behaviour of triangular strand ropes for deep shafts.