Author:Vogt, DR; Nyareli, TNDate:Jun 2008It is difficult to achieve significant directivity in the radial direction of a borehole radar antenna, because the spacing of antenna elements is typically constrained by the borehole diameter to be considerably less than a wavelength. In ...Read more
Author:Nickless, A; Archibald, SA; Van der Merwe, Martina R; Scholes, RJ; Williams, CA; Hanan, NDate:Mar 2011Annual estimates of gross primary production (GPP) and ecosystem respiration (Reco) were obtained for the Skukuza flux site, Kruger Park, South Africa, based on the eddy covariance flux data. A new method of extrapolating night-time respiration ...Read more
Author:Shatalov, M; Fedotov, I; Joubert, SVDate:Sep 2008A novel method of function approximation using an initial value, linear, ordinary differential equation (ODE) is presented. The main advantage of this method is to obtain the approximation expressions in a closed form. This technique can be ...Read more
Author:Haarhoff, LJ; Kok, S; Wilke, DNDate:Apr 2013Kriging is used extensively as a metamodel in multidisciplinary design optimization. The correlation matrix used in Kriging metamodeling frequently becomes ill-conditioned. Therefore different numerical methods used to solve the Kriging ...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