Articles by Author: Dg Bishop

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We found 14 results for you
  1. ACCURACY EVALUATION OF CODE FOR THE CHARACTERISTIC INITIAL VALUE PROBLEM IN GENERAL RELATIVITY

    ACCURACY EVALUATION OF CODE FOR THE CHARACTERISTIC INITIAL VALUE PROBLEM IN GENERAL RELATIVITY

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    The paper describes numerical tests of the accuracy of a general relativity code for the non-rotating axisymmetric characteristic initial value problem. The results compare reasonably well with theoretical expectations.
  2. THE POINCARÉ INEQUALITY FOR A VECTOR FIELD WITH ZERO TANGENTIAL OR NORMAL COMPONENT ON THE BOUNDARY

    THE POINCARÉ INEQUALITY FOR A VECTOR FIELD WITH ZERO TANGENTIAL OR NORMAL COMPONENT ON THE BOUNDARY

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Poincaré's inequality is well known: given a bounded domain G, ∥u∥p ⋚ c∥∇u∥p provided u(x) vanishes on the boundary ∂G. The case where u(x) is a vector field u(x) that does not vanish on the boundary ∂G is considered. It...
  3. OBSERVATIONAL COSMOLOGY AND NUMERICAL RELATIVITY

    OBSERVATIONAL COSMOLOGY AND NUMERICAL RELATIVITY

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    This paper brings together the theory of observational cosmology and the null-cone characteristic initial value problem (CIVP) of numerical relativity. A computer code is constructed which calculates the past behaviour of the Universe from input data that is, in principle,...
  4. COMPARING LARGE-SCALE COSMOLOGICAL DENSITY FLUCTUATIONS

    COMPARING LARGE-SCALE COSMOLOGICAL DENSITY FLUCTUATIONS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Two methods for looking at cosmological density on large scales are briefly described. The first takes galaxies observed in infrared, by the IRAS satellite. The second method, called POTENT by its inventors (Dekel and Bertschinger), uses the observed peculiar motions...
  5. High levels of mitochondrial cytochrome <em>b</em> sequence diversity are present within the <em>Anthus similis</em> complex in sub-Saharan Africa

    High levels of mitochondrial cytochrome <em>b</em> sequence diversity are present within the <em>Anthus similis</em> complex in sub-Saharan Africa

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    The taxonomy of pipits (genus Anthus) in sub-Saharan Africa is poorly understood. We applied mitochondrial cytochrome b (cyt b) sequencing to specimens of the African Long-billed Pipit Anthus similis, using Palearctic A. s. captus for comparison. There was virtually no...
  6. Difficult airways: a reliable “Plan B”

    Difficult airways: a reliable “Plan B”

    Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia
    Percutaneous transtracheal jet ventilation (PTJV) is an accepted method of rescue ventilation following unsuccessful attempts to secure the airway through conventional methods. Pre-emptive use of PTJV in the difficult airway has also been described as using either a specifically designed...
  7. Predicting spinal hypotension during Caesarean section

    Predicting spinal hypotension during Caesarean section

    Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia
    Hypotension under spinal anaesthesia for Caesarean section remains a common problem, with attendant maternal and foetal morbidity. This review examines some of the issues surrounding the prediction of spinal hypotension, including concerns about current evidence, the debate on the mechanism...
  8. Heart rate variability predicts 30-day all-cause mortality in intensive care units

    Heart rate variability predicts 30-day all-cause mortality in intensive care units

    Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia
    Background: Autonomic nervous function, as quantified by heart rate variability (HRV), has shown promise in predicting clinically important outcomes in the critical care setting; however, there is debate concerning its utility. HRV analysis was assessed as a practical tool for...