Articles by Author: J Hattingh

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We found 34 results for you
  1. Monitoring of veld burns using satellite imagery

    Monitoring of veld burns using satellite imagery

    Using simple image interpretation procedures, veld burning from June to October 1981 was monitored over 19 394 100 ha of the eastern agricultural regions of South Africa. From 1 096 burns, an area of 412 826 ha burnt veld was...
  2. Kleimineralogie, katioonuitruilkapasiteit en waterhouvermoë van grondvorms in die Hoëveldstreek

    Kleimineralogie, katioonuitruilkapasiteit en waterhouvermoë van grondvorms in die Hoëveldstreek

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Kleimineralogiese data vir 12 grondvorms, wat algemeen in die Hoëveldstreek voorkom, is ondersoek. Die persentasie monsters waarin 'n bepaalde kleimineraal voorkom, is bereken. Daaruit is dit duidelik dat smektiet algemeen in gronde van die Arcadia-, Bonheim, en Rensburgvorms voorkom, maar...
  3. THE EFFECT OF NEUTRALIZATION OF THE ANAESTHETIC MS 222 ON FRESHWATER QUALITY

    THE EFFECT OF NEUTRALIZATION OF THE ANAESTHETIC MS 222 ON FRESHWATER QUALITY

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    This study indicates that MS 222, which is acidic in nature, causes changes in pH, pCO2 alkalinity and calcium hardness levels in tapwater and bore-holewater. Distilled water shows pH and conductivity changes whereas conductivity was not affected in boreholewater. Tapwater...
  4. THE EDGE-CHROHATIC NUMBER OF A CIRCULANT

    THE EDGE-CHROHATIC NUMBER OF A CIRCULANT

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    The circulant graph Cp > a1,…, ak < with 0 > a1 >…> ak >(pt1)/2 has p vertices labeled 0,1,…,p-1 and x and y are adjacent if and only if x—y = ± ai (mod p) for some i. We...
  5. PRODUCTS OF CIRCULANT GRAPHS

    PRODUCTS OF CIRCULANT GRAPHS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Graph products of circulants are studied. It is shown that if G and H are circulants and gcd(v(G), v(H)) = 1, then every B-product of G and H is again a circulant. We prove that if m ≠ 2, then...
  6. ASYMPTOTIC BOUNDS FOR IRREDUNDANT RAMSEY NUMBERS

    ASYMPTOTIC BOUNDS FOR IRREDUNDANT RAMSEY NUMBERS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    The irredundant Ramsey number s(m,n) is the smallest N such that in every red-blue colouring of the edges of KN , either the blue graph contains an m-element irredundant set or the red graph contains an n-element irredundant set. We...
  7. SHORT NOTES

    SHORT NOTES

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology