Browsing by Author "Botha, J."

Now showing 1 - 3 of 3
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    The adult respiratory distress syndrome in association with diabetic keto-acidosis: A case report
    (Health & Medical Publishing Group, 1987-04) Botha, J.; Van Niekerk, D. J. T.; Rossouw, D. J.; Stewart, R. I.
    ENGLISH ABSTRACT: A 41-year-old man presented in stupor, with ketoacidosis and acute severe respiratory failure. He had a history of alcohol abuse and had been on insulin therapy for diabetes secondary to chronic pancreatitis for 11 years. The condition was rapidly progressive and the patient died within 5 hours of presentation of profound hypoxia and hypotension despite aggressive therapy. Autopsy confirmed the clinical diagnosis of 'shock lung'. None of the more commonly associated precipitating factors of adult respiratory distress syndrome could be detected clinically or at autopsy and the pathogenesis of the condition remains elusive.
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    Reliability assessment of the South African wind load design formulation
    (South African Institution of Civil Engineering, 2018-09) Botha, J.; Retief, J. V.; Viljoen, C.
    ENGLISH ABSTRACT: The representation of the strong wind climate and the reliability calibration of wind loading are the main components of the provisions for local conditions in the South African wind load standard. The reliability implications of new probability models for wind load and an updated map of the characteristic wind speed are assessed in this paper. Wind load probability distributions are based on a combination of new models for free-field wind pressure, pressure coefficients and terrain factors with existing information. The results from both assessments show that the wind load partial factor of 1.3 does not result in adequate reliability performance for typical design situations. A partial factor of 1.6 is recommended. Where an increased partial factor for wind loading will result in a corresponding increase in the design wind load, the introduction of an updated map of the characteristic wind speed for South Africa is shown to result in an overall reduction of wind load. Regional analysis, however, indicates that there are regions in the Western and Eastern Cape that will have increased design wind loads. Combined with an updated partial factor of 1.6, the aggregate increase in design wind loads across South Africa is shown to be 11%.
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    Subjective pulsatile tinnitus cured by carotid endarterectomy
    (Health & Medical Publishing Group, 1989-05) Louwrens, H. D.; Botha, J.; Van der Merwe, D. M.
    A 70-year-old woman with unilateral pulsatile tinnitus was relieved of the complaint after carotid endarterectomy. Internal carotid artery stenosis presenting with pulsatile tinnitus is rare. Endarterectomy can relieve symptoms if the correct diagnosis is made.