Now showing items 2376-2395 of 3603

    • On fantastic narratives: Lewis through the wardrobe into Narnia 

      Jordaan, Pierre; Kotze, Francois Jacobus (Institute for Afro-Hellenic Studies, 2007)
    • On Huppert's Conjecture for alternating groups of low degrees 

      Nguyen, Hung Ngoc; Tong-Viet, Hung; Wakefield, Thomas P. (World Scientific, 2015)
      Bertram Huppert conjectured in the late 1990s that the nonabelian simple groups are determined up to an abelian direct factor by the set of their character degrees. Although the conjecture has been established for various ...
    • On legitimacy in impact assessment: an epistemologically-based conceptualisation 

      Bond, Alan; Pope, Jenny; Retief, Francois; Morrison-Saunders, Angus (Elsevier, 2018)
      Impact assessment (IA) is carried out as an ex ante process to inform decision-making. It includes requirements for engagement with stakeholders (including the public) regarding actions proposed by a proponent. A key issue ...
    • On maximum likelihood estimation of the long-memory parameter in fractional Gaussian noise 

      Robbertse, Wickes; Lombard, Fred (Taylor & Francis, 2014)
      Approximate normality and unbiasedness of the maximum likelihood estimate (MLE) of the long-memory parameter H of a fractional Brownian motion hold reasonably well for sample sizes as small as 20 if the mean and scale ...
    • On Multi–Laplace Transform for Solving Nonlinear Partial Differential Equations with Mixed Derivatives 

      Atangana, Abdon; Oukouomi, Noutchie Suares Clovis (Hindawi Publising Coperation, 2014)
      A novel approach is proposed to deal with a class of nonlinear partial equations including integer and noninteger order derivative. This class of equations cannot be handled with any other commonly used analytical technique. ...
    • On p-convergent operators on Banach lattices 

      Zeekoei, Elroy D.; Fourie, Jan H. (Springer, 2018)
      The notion of a p-convergent operator on a Banach space was originally introduced in 1993 by Castillo and Sánchez in the paper entitled “Dunford–Pettis-like properties of continuous vector function spaces”. In the present ...
    • On positive maps in quantum information 

      Majewski, W.A. (Springer Verlag, 2014)
      Using the Grothendieck approach to the tensor product of locally convex spaces, we review a characterization of positive maps as well as Belavkin–Ohya characterization of PPT states. Moreover, within this scheme, a ...
    • On quantum statistical mechanics: a study guide 

      Majewski, Wladyslaw Adam (Hindawi, 2017)
      We provide an introduction to a study of applications of noncommutative calculus to quantum statistical physics. Centered on noncommutative calculus, we describe the physical concepts and mathematical structures appearing ...
    • On quasi-uniform box products 

      Otafudu, Olivier Olela; Sabao, Hope (Universidad Politécnica de Valencia, 2017)
      We revisit the computation of entourage sections of the constant uniformity of the product of countably many copies the Alexandroff one-point compactification called the Fort space. Furthermore, we define the concept of a ...
    • On the asymptotic theory of new bootstrap confidence bounds 

      Pretorius, Charl; Swanepoel, Jan W.H. (IMS, 2018)
      We propose a new method, based on sample splitting, for constructing bootstrap confidence bounds for a parameter appearing in the regular smooth function model. It has been demonstrated in the literature, for example, ...
    • On the characters of the Sylow p-subgroups of untwisted Chevalley groups Yn(pa) 

      Himstedt, Frank; Le, Tung; Magaard, Kay. (Cambridge University Press, 2016)
      Let be a Sylow -subgroup of an untwisted Chevalley group of rank defined over where is a power of a prime . We partition the set of irreducible characters of into families indexed by antichains of positive roots of the ...
    • On the contamination of membrane-electrode assemblies of water electrolysers based on proton exchange membrane in the course of operation. 

      Grigoriev, S.A.; Bessarabov, D.G.; Grigoriev, A.S.; Kuleshov, N.V.; Fateev, V.N. (BAS, 2018)
      The issues of contamination of membrane-electrode assemblies (MEAs) of water electrolysers based on proton exchange membrane (PEM) currently pose a subject for investigation. The analysis of structure and chemical composition ...
    • On the effects of pickup ion-driven waves on the diffusion tensor of low-energy electrons in the heliosphere 

      Engelbrecht, N. Eugene (IOP Publishing, 2017)
      The effects of Alfvén cyclotron waves generated due to the formation in the outer heliosphere of pickup ions on the transport coefficients of low-energy electrons is investigated here. To this end, parallel mean free path ...
    • On the fractional Nagumo equation with nonlinear diffusion and convection 

      Atangana, Abdon; Oukouomi Noutchie, Suares Clovis (Hindawi Publishing Corporation, 2014)
      We presented the Nagumo equation using the concept of fractional calculus.With the help of two analytical techniques including the homotopy decomposition method (HDM) and the new development of variational iteration method ...
    • On the Hamilton-Jacobi-Bellman Equation by the Homotopy Perturbation Method 

      Atangana, Abdon; Ahmed, Aden; Oukouomi Noutchie, Suares Clovis (Hindawi Publishing Corporation, 2014)
      Our concern in this paper is to use the homotopy decomposition method to solve the Hamilton-Jacobi-Bellman equation (HJB). The approach is obviously extremely well organized and is an influential procedure in obtaining the ...
    • On the hamilton–jacobi–bellman equation by the homotopy perturbation method 

      Atangana, Abdon; Ahmed, Aden; Oukouomi Noutchie, Suares Clovis (Hindawi Publishing Corporation, 2014)
      Our concern in this paper is to use the homotopy decomposition method to solve the Hamilton-Jacobi-Bellman equation (HJB). The approach is obviously extremely well organized and is an influential procedure in obtaining the ...
    • On the methanol masers in G9.62+0.20E and G188.95+0.89 

      Van der Walt, Diederick Johannes (IOP Publishing, 2011)
      A comparison between the observed light curves of periodic masers in G9.62+0.20E and G188.95+0.89 and the results of a simple colliding-wind binary model is made to establish whether the flaring and other time-dependent ...
    • On the propagation times and energy losses of cosmic rays in the heliosphere 

      Strauss, R.D.; Potgieter, M.S.; Kopp, A.; Büsching, I. (American Geophysical Union, 2011)
      We present calculations of the propagation times and energy losses of cosmic rays as they are transported through the heliosphere. By calculating these quantities for a spatially 1D scenario, we benchmark our numerical ...
    • On the pulse shape of ground-level enhancements 

      Strauss, R.D.; Ogunjobi, O.; Moraal, H.; McCracken, K.G.; Caballero-Lopez, R.A. (Springer, 2017)
      We study the temporal intensity profile, or pulse shape, of cosmic ray ground-level enhancements (GLEs) by calculating the rise (τr) and decay (τd) times for a small subset of all available events. Although these quantities ...
    • On the solutions and conservation laws for the Sharma–Tasso–Olver equation 

      Johnpillai, A. G.; Khalique, Chaudry Masood (2014)
      We study the Sharma-Tasso-Olver equation from the Lie symmetry point of view. We derive the Lie point symmetry generators of the equation and classify them to obtain the optimal system of one-dimensional subalgebras of the ...