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Browsing Defence, peace, safety & security by Issue Date

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  • Beyers, ME (American Institute of Aeronautics and Astronautics, 1975)
    A technique based on superposition of tricyclic solutions has been proposed for smoothing free-flight angular motion. When incorporated into a conventional tricyclic data reduction program, the method is convenient to use ...
  • Getz, WM; Pachter, M (American Institute of Aeronautics and Astronautics, 1981)
    The regions of capturability and draw are derived for a two-target pursuit-evasion differential game of two cars. Specifically, using geometric arguments, complete barrier surfaces are constructed that emanate from the ...
  • Van Den Broek, GJ (American Institute of Aeronautics and Astronautics, 1984-05)
    A computer program, developed to predict the separation characteristics of external stores after release from the carrier aircraft, is discussed The aircraft is represented by panel singularity distributions along the line ...
  • Van Den Broek, GJ (American Institute of Aeronautics and Astronautics, 1984-07)
    The effect of aircraft wind modelling on the external store loads is investigated by computing that effect for the external flow field generated by the wing. The application of the panelling /boundary condition method to ...
  • Guest, IW; Pauw, CK (Institute for Electrical Electronics Engineers Inc, 1993-04)
    A rank detector is used to defect instantaneous received power fades in tracking radar. On detection of a fade, censorship of the angular position measurement is implemented in a Kalman tracking filter. It is shown that ...
  • Van Zyl, Louwrens H (American Institute of Aeronautics and Astronautics, 1993-07)
    The use of eigenvectors to assign eigenvalues to modes for the p-k formulation of the flutter equation is described. The procedure has the potential to overcome some of the problems of the determinant iteration procedure ...
  • Mcnamara, DA; Botha, L (IEEE-INST Electrical Electronics Engineers INC, 1993-11)
    The 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.
  • Lombardi, G; Morelli, Mauro F (American Institute of Aeronautics and Astronautics, 1994-03)
    In a previous analysis of the effect of a fore sweep in the subsonic and transonic regimes it was found that the flow on a forward-swept wing separates first in the root region, suggesting that the inclusion of an aerodynamic ...
  • Van Zyl, Louwrens H (American Institute of Aeronautics and Astronautics, 1994-11)
    The article discusses ways in which the integrals resulting from a zero-order discontinuous pressure distribution can be arranged in such a way that they can be solved by either normal quadrature or curve fitting followed ...
  • Smit, MC; Ferreira, JA; Van Wyk, JD; Ehsani, M (Institue of Electrical, Electronics and Engineers inc, 1995-01)
    The concept of an integrated structure for the capacitor, inductor and transformer of the series resonant converters presented. It is shown that the necessary capacitance can be achieved by using a bifilar primary and the ...
  • Lombardi, G; Morelli, Mauro F (American Institute of Aeronautics and Astronautics, 1995-05)
    The effects of the walls of a test section on a model in transonic flow were investigated by using the AGARD Calibration Model B. Tests were carried out in a closed-circuit pressurized tunnel, with a confined square test ...
  • Benson, JM; Reeves, A; Lagrange, SG (Pergamon-Elsevier Science Ltd, 1998-06)
    Failure analyses of various engine and airframe components from South African Air Force aircraft have been performed by the Division of Materials Science and Technology over several years and these have ranged from crash ...
  • Lombardi, G; Salvetti, MV; Morelli, Mauro F (American Institute of Aeronaut and Astronaut, 1998-07)
    The capabilities of different numerical methods in evaluating the aerodynamic characteristics of a forward-swept wing in subsonic and transonic now are analyzed. The numerical results, obtained by means of potential, Euler, ...
  • Manara, G; Nepa, P; Kouyoumjian, RG; Taute, BJE (Institute of Electrical Electronics Engineers Inc, 1998-11)
    The diffraction of an inhomogeneous plane wave by an impedance wedge embedded in a lossy medium is analyzed. The rigorous integral representation for the field is asymptotically evaluated in the context of the uniform ...
  • Turpin, SM; Cooper, Antony K (1998-11)
    Recently, the CSIR has been involved in two projects investigating information technology (IT) and related processes in the civil and criminal justice systems, one with the Department of Justice focusing on civil justice, ...
  • Kruger, OA (Bureau International des Poids et Mesures, 2001)
    The most commonly used method in the calibration of step gauges is the coordinate measuring machine (CMM), equipped with a laser interferometer for the highest accuracy. This paper describes a modification to a length-bar ...
  • Schmitz, Peter MU; Stylianides, T (2002-12)
    South Africa is subdivided into provinces and each province is further subdivided into magisterial districts, the area of jurisdiction of a district court. South African Courts have a three-tier structure namely: district, ...
  • Smit, AG; Anderson, F (2003-08)
    This paper the considers the question whether the transformation in the South African Defence Research Institutes (DERI's) during the 1990's rendered their use of the formal Systems Engineering (SE) processes inappropriate ...
  • Snedden, Glen C; Roos, TH; Naidoo, K (2003-09)
    Previous simulations of a turbojet disc cavity with full Navier-Stokes CFD and simplified geometry and boundary conditions have been improved to reduce the level of approximation. A new grid was built using a multi-block ...
  • Snedden, Glen C (2003-09)
    A comprehensive computational fluid dynamics (CFD) model of an actual disc cavity, complete with rotation and conjugate heat transfer, is presented. The model uses a commercially available code with geometrical accuracy ...

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