Author:Shatalov, MDate:Jul 2011Many of wave propagation problems describing by hyperbolic equations could be formulated in terms of the variational principles. In the paper we demonstrate how to derive the systems of ordinary differential equations of the method of lines ...Read more
Author:Manamela, Selolo S; Cilliers, Jacques E; Gaffar, YADate:Dec 2023In this paper, the problem of modelling radio wave propagation through vegetation using parabolic equation methods is investigated by modifying the parabolic equation toolbox (PETOOL) to incorporate a mechanism to model vegetation. The ...Read more
Author:Lesoli, MS; Dube, S; Monde, NDate:Jul 2010Rangeland degradation results in declining functional capacity, increased poverty, and food insecurity. Major changes in rangeland surface morphology and soil characteristics have a drastic effect on the primary productivity of the rangeland ...Read more
Author:Nordengen, Paul A; Kienhöfer, F; De Saxe, CDate:2014As part of a performance-based standards (PBS) research programme for heavy vehicles in South Africa, a need was identified to design, manufacture and operate a number of PBS or Smart Truck demonstration vehicles. The purpose of the demonstration ...Read more
Author:Mukaro, R; Govender, K; Gledhill, Irvy MA; Kokwe, NLDate:Jan 2010In this paper we report on the laboratory investigations of breaking water waves. Measurements of the water levels and instantaneous fluid velocities were conducted in water waves breaking on a sloping beach within a glass flume. Instantaneous ...Read more
Author:Snyman, I.MDate:Sep 2012This paper uses high-speed video images of the PHOTRON APX-RS high-speed camera to determine the velocity of the expanding volume of by-products of a buried landmine. The study analyses three experiments done with the Scientifically Instrumented ...Read more
Author:Botha, LDate:Mar 2007This paper looks at the suitability of using the CADRCS RCS prediction tool for research into a class of NCTR work where the radar will give a high resolution output of the target, either a High Range Resolution (HRR) plot or Inverse Synthetic ...Read more
Author:Davel, MH; De Wet, FebeDate:Sep 2010The authors describe a new language-independent technique for automatically identifying errors in an electronic pronunciation dictionary by analyzing the source of conflicting patterns directly.They evaluate the effectiveness of the technique ...Read more
Author:Mthethwa, Sthembile; Dlamini, Nelisiwe PDate:Mar 2018Hardcopy document forgery is still a challenge and occurs frequently nowadays. Many countries have reported a lot of cases, including South Africa where government issues documents are forged. Protecting these documents from being tampered ...Read more
Author:Seotsanyana, M; Geldenhuys, JDate:Nov 2009The ever-increasing reliance of society on computers has led to a need for highly reliable systems. Computer systems perform critical functions in a number of areas ranging from online transaction processing (such as banking systems) to ...Read more
Author:De Villiers, J; Jermy, R; Nicolls, FDate:May 2014This paper presents a system to determine the photogrammetric parameters of a camera. The lens distortion, focal length and camera six degree of freedom (DOF) position are calculated. The system caters for cameras of different sensitivity ...Read more
Author:Schwegmann, Colin P; Kleynhans, Waldo; Salmon, BP; Mdakane, Lizwe W; Meyer, Rory GVDate:Jul 2016Efficient and effective ship discrimination across multiple Synthetic Aperture Radar sensors is becoming more important as access to SAR data becomes more widespread. A flexible means of separating ships from sea is ideal and can be accomplished ...Read more
Author:Meyer, Rory GV; Schwegmann, Colin P; Kleynhans, WaldoDate:Jul 2017Detections and classification of non-AIS-compliant vessels is an important ability for countries or institutions interested in MDA. SAR has been proven to be an effective method but there exists a trade-off between the area that can be imaged ...Read more
Author:Tulsi, K; Phelp, D; O'Connor, PDate:May 2014Physical model studies were conducted of a 250K DWT fully laden iron ore vessel grounding on the side slopes of the outbound channel at a major Australian port. A key deliverable of the study was to estimate the tug force required to pull the ...Read more
Author:Cooper, Antony KDate:Nov 2015This presentation discusses the differences between meanings of various geographical information definitions.Read more
Author:Aderonmu, AI; Rotimi, AH; Masonta, Moshe T; Mzyece, MDate:Nov 2012Radio Frequency (RF) spectrum is a natural resource widely used by wireless network operators to provide radio communications or transmission systems (e.g. telephone operators and TV broadcast stations). Scarcity of RF spectrums has led to ...Read more
Author:Strydom, Anria; Els, PSDate:Jun 2014Stabilised platforms are regularly integrated with vehicles in various applications such as terrain mapping and surveillance. The equipment installed on the platform is often sensitive to motion and has to be isolated from unnecessary vibrations. ...Read more
Author:Shatalov, MY; Lunin, BSDate:May 2007Simple mathematical model of vibratory gyroscopes imperfections is formulated, which includes anisotropic damping and variation of mass-stiffness parameters and their harmonics. The method of identification of parameters of the mathematical ...Read more
Author:Skosana, Vusi J; Abu-Mahfouz, Adnan MIDate:Nov 2020Wireless multimedia sensor networks (WMSNs) make possible diverse and demanding monitoring and surveillance applications. The WMSNs have to operate with significant energy, memory and processing power constraints. These constraints make video ...Read more