Articles by Author: L F Jackson

Search results for L F Jackson

We found 83 results for you
  1. *-RINGS AND THEIR RADICALS

    *-RINGS AND THEIR RADICALS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    This paper is to investigate the class * of all prima rings without proper non-zero prima factors and to characterize the ‘minimal special radical’ containing the class * as well as the ‘maximal special radical’ the semisimple class of which...
  2. ON ATOMS OF THE LATTICE OF SUPERNILPOTENT RADICALS

    ON ATOMS OF THE LATTICE OF SUPERNILPOTENT RADICALS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    This note is to indicate atoms of the lattice of all supernilpotent radicals for associative rings which cannot be represented as supernilpotent radicals generated by suitable simple idempotent rings. This gives a negative answer to Rjabukhin's question [6].
  3. RADICALS THAT DO NOT CONTAIN NON-ZERO *-RINGS

    RADICALS THAT DO NOT CONTAIN NON-ZERO *-RINGS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Some radicals connected with atoms of the lattice of all special radicals of associative rings are studied.
  4. RINGS RELATED TO SPECIAL ATOMS

    RINGS RELATED TO SPECIAL ATOMS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    A ring which is an essential extension of a prime ring without proper prime homomorphic imges is called a *k-ring. *k-rings are characterized and it is shown that every non-zero prime ring whose every proper homomorphic image is artinian on...
  5. Initial impact of the <em>Treasure</em> oil spill on seabirds off western South Africa

    Initial impact of the <em>Treasure</em> oil spill on seabirds off western South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    On 23 June 2000, the bulk ore carrier MV Treasure sank off western South Africa between Dassen and Robben islands, which individually currently support the largest and 3rd largest colonies of African penguins Spheniscus demersus. Subsequently, more than 19 000...
  6. The effects of Qatar crude oil on reproductive success in the sand-prawn <em>Callianassa kraussi</em> under static aquarium conditions

    The effects of Qatar crude oil on reproductive success in the sand-prawn <em>Callianassa kraussi</em> under static aquarium conditions

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The reproductive success of Callianassa kraussi exposed to a water-soluble fraction of Qatar crude oil was investigated on the basis of embryonic development, hatching success, larval development and survival of post-larval stages. Embryos showed a number of abnormalities, of which...
  7. Seabirds as consumers in the southern Benguela region

    Seabirds as consumers in the southern Benguela region

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Estimates of consumption of fish by breeding seabirds in the southern Benguela region converge on 50–60 × 103 tons of food per year. Total annual avian consumption of food is approximately 15,5 × 104 tons, 74 per cent being taken...