Author:Candy, LP; Lasenby, JDate:Apr 2010The orientation vector differential equation was first derived by John Bortz to improve the accuracy of strapdown inertial navigation attitude algorithms. These algorithms previously relied on the direct integration of the direction cosine ...Read more
Author:Shatalov, M; Fedotov, IDate:Aug 2007In this paper the authors present a new method of numerical evaluation of unknown coefficients of a dynamical system having available information about unknown phase trajectories at some time values. The method consists in the direct integration ...Read more
Author:Rens, G; Meyer, T; Casini, GDate:Aug 2016We propose a method for an agent to revise its incomplete probabilistic beliefs when a new piece of propositional information is observed. In this work, an agent’s beliefs are represented by a set of probabilistic formulae – a belief base. ...Read more
Author:Gololo, KV; Majozi, TDate:Jan 2011Cooling water systems are generally designed with a set of heat exchangers arranged in parallel. This arrangement results in higher cooling water flow rate and low cooling water return temperature, thus reducing cooling tower efficiency. ...Read more
Author:Majozi, T; Price, TDate:Aug 2010The traditional steam system comprises a steam boiler and the associated heat exchanger network (HEN). Most research published in literature tends to address both the elements of the steam system as separate entities instead of analyzing, ...Read more
Author:Price, T; Majozi, TDate:Aug 2010Heat exchanger networks in steam systems are traditionally designed to operate in parallel. Coetzee and Majozi (Ind. Eng. Chem. Res. 2008, 47, 4405-4413) found that by reusing steam condensate within the network the steam flow rate could be ...Read more
Author:Boesack, CD; Marwala, T; Nelwamondo, Fulufhelo VDate:Mar 2012Automatic Generation Control (AGC) of large interconnected power systems are typically controlled by a PI or PID type control law. Recently intelligent control techniques such as GA-Fuzzy controllers have been widely applied within the power ...Read more
Author:Beraki, Asmerom F; Landman, WA; DeWitt, DDate:Nov 2015The study compares one- and two-tiered forecasting systems as represented by the South African Weather Service Coupled Model and its atmosphere-only version. In this comparative framework, the main difference between these global climate ...Read more
Author:Chutter, FMDate:Dec 1968There is a large population of Simulium chutteri lewis in the Vaal river at and below the village of Warrenton in the north-east of the Cape Province, South Africa. The female of this species attacks man, cattle and horses and had become a ...Read more
Author:Mcnamara, DA; Botha, LDate:Nov 1993The radiation properties of individual folded dipole antennas mounted at various radial distances from the centre of conducting masts of different diameters are described in compact fashion.Read more
Author:Booth, R; Meyer, T; Varzinczak, I; Wassermann, RDate:Sep 2011Standard belief change assumes an underlying logic containing full classical propositional logic. However, there are good reasons for considering belief change in less expressive logics as well. In this paper the authors build on recent ...Read more
Author:Greben, JMDate:Nov 1991This paper originated from the author's dissatisfaction with the way the discrete Fourier transform is usually presented in the literature. Although mathematically correct, the physical meaning of the common representation is unsatisfactory, ...Read more
Author:Osborne, C; Cornish, L; Luyckx, SDate:1997The aim of this work was to produce V8C7-WC and V4C3-WC powders with grain size between 1 and 2mu-m, as a first stage of the preparation of fine grained WC-VC-Co hardmetal. V8C7-WC powder was produced via two routes: starting from preformed ...Read more
Author:Greben, JMDate:2009It has become common to describe complexity science as a new approach to many scientific questions that are less amenable to the usual “mechanistic view” of reality in science. However, we believe that the contrast implied here is to a large ...Read more
Author:Engelbrecht, GN; Vos, APDate:Jul 2009This article delineates generic causes to internal conflict and proposes a coalition-forming methodology to allow for power sharing as one avenue of conflict resolution. A suitable framework to study causes to internal conflict should, at ...Read more
Author:Dufois, F; Penven, P; Whittle, CP; Veitch, JDate:2012Using in situ sea surface temperature (SST) data and MODIS/TERRA SST, the monthly AVHRR Pathfinder (version 5.0 and 5.2) SST product was evaluated within the four main Eastern Boundary Upwelling Systems. A warm bias in the monthly Pathfinder ...Read more
Author:Khomenko, MD; Mirzade, FKH; Pityana, Sisa LDate:Nov 2018The developed hydrodynamic model of laser cladding (LC) considering catchment efficiency is verified with experimental data for steel powder LC in a wide range of process parameters. The comparison of the main calculated output parameters ...Read more
Author:Snedden, Glen C; Dunn, Dwain I; Ingram, GDate:Apr 2018Non-axisymmetric endwalls in turbine stages have shown to be a robust method to improve the performance of turbines in both power generation and aero-derivative applications. Non-axisymmetric endwalls target the control of secondary flows and ...Read more