Articles by Author: Donovan Stefan

Search results for Donovan Stefan

We found 22 results for you
  1. The inflation hedging properties of South African and international asset classes

    The inflation hedging properties of South African and international asset classes

    Item type: Journal Article • Journal: Investment Analysts Journal
    Within the period 1965 to 2015 all domestic asset class returns (except cash) are found to exhibit negative correlations with the contemporaneous inflation rate. Cash has hedging qualities due to Reserve Bank inflation targeting policy action but has a low...
  2. Radicals and splitting extensions of rings

    Radicals and splitting extensions of rings

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We examine the relationship between the radical of a ring and the radical of the associated splitting extension of the ring.
  3. MORITA NEAR-RINGS

    MORITA NEAR-RINGS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We define a morita context for near-rings and subsequently a morita near-ring. Any near-ring can be considered as a morita context for near-rings, and the corresponding morita near-ring is just the 2 x 2 matrix near-ring over the near-ring. We...
  4. The evolution of coleoid cephalopods and their present biodiversity and ecology

    The evolution of coleoid cephalopods and their present biodiversity and ecology

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The present status of phylogeny and classification in coleoid cephalopods and the effect of evolution on the present ecology and biodiversity in the group are examined. The basis of knowledge of cephalopod phylogeny was formulated by Naef in the early...
  5. A Psychological Support for Peacekeeping Soldiers and their Families: A Preliminary Model

    A Psychological Support for Peacekeeping Soldiers and their Families: A Preliminary Model

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    Being a military family can be challenging, and the demands placed on soldiers and their families can become very complex. Military deployments are part of a soldier's military career that cannot be avoided and have the potential to influence military...
  6. MODULO-CONSTANT IDEAL-HEREDITARY RADICALS OF NEAR-KINGS

    MODULO-CONSTANT IDEAL-HEREDITARY RADICALS OF NEAR-KINGS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    It is known that no “good” radical of (not necessarily o-symmetric) near-rings can be ideal-hereditary. Using the results of the o-symmetric case, we show that the situation is not as bad as on first appearances and we give several examples...
  7. SUBIDEMPOTENT RADICAL CLASSES

    SUBIDEMPOTENT RADICAL CLASSES

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We show that a semisimple class of rings M satisfies condition (β) (i.e. I ◃ A ◃ M and A2 = 0 implies A/I ε M) if and only if the corresponding radical class is hypersolvable or hypo-idempotent. Any radical...
  8. On the purposes of phonological phenomena: phonetics, parsing and/or acquisition?

    On the purposes of phonological phenomena: phonetics, parsing and/or acquisition?

    Item type: Journal Article • Journal: Southern African Linguistics and Applied Language Studies
    The first part of this paper investigates two hypotheses that have been put forward about the purpose of phonological phenomena, namely the mainstream view that the properties of the articulatory or auditory system motivate the phonology (the Phonetic Hypothesis), and...
  9. Morphometrics of White-browed Sparrow-Weavers <em>Plocepasser mahali</em> in south-western Zimbabwe

    Morphometrics of White-browed Sparrow-Weavers <em>Plocepasser mahali</em> in south-western Zimbabwe

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    This paper describes size and body condition of individuals in a population of the cooperatively breeding White-browed Sparrow-Weaver Plocepasser mahali in south-western Zimbabwe in relation to the birds’ social status within their colony. We undertook measurements and observations of colour-ringed...
  10. Effects of a fast-burning spring fire on the ground-dwelling spider assemblages (Arachnida: Araneae) in a central South African grassland habitat

    Effects of a fast-burning spring fire on the ground-dwelling spider assemblages (Arachnida: Araneae) in a central South African grassland habitat

    Item type: Journal Article • Journal: African Zoology
    Fire is widely used as a management strategy in grasslands to maintain vegetation structure and improve grazing quality for large herbivores. The impacts of burning on invertebrates in South Africa remain poorly understood. A study was initiated in spring 2005...