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  • Monte Carlo simulations  (1)
  • Oxalate  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Bootstrapping: A Fast Way to Simulate QTz Curves (1999)
    Springer
    Mathematical geology 31 (1999), S. 471-485 
    Details
    ISSN: 1573-8868
    Keywords: recoverable reserves ; conditional simulations ; Monte Carlo simulations ; risk assessment ; gold
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract The aim of this paper is to present a fast method based on bootstrapping, for simulating recoverable reserves for input to financial Monte Carlo simulations. In mining, the three parameters defining recoverable reserves are the cutoff grade, z, the ore tonnage above cutoff, T, and the metal quantity above cutoff, Q. After introducing the concept of 3-dimensional QTz curves, the statistical technique called bootstrapping is reviewed and applied to a set of South African gold grades. As selective mining is carried out on blocks not points, these curves have to be calculated for blocks. The QTz curves obtained by bootstrapping are compared to those obtained by conditionally simulating the same deposit. The procedure has been extended to incorporate geologists' ideas of the likely size of the ore volume. Lastly, the recoverable reserves obtained by bootstrapping are compared with those obtained by traditional risk analysis (base case ± 10% or 20%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007546926089
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of humidity on the mineral composition of tomato plants with special reference to calcium distribution (1979)
    Springer
    Plant and soil 52 (1979), S. 427-435 
    Details
    ISSN: 1573-5036
    Keywords: Ash alkalinity ; Calcium ; Cation distribution ; Humidity ; Magnesium ; Mineral composition ; Oxalate ; Pectate ; Tomato
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Tomato plants grown in water culture under two different humidity regimes (50% R.H. and 95% R.H.) were harvested at intervals over the growth period and cation uptake and calcium distribution investigated. The following results were obtained: 1. Plants in the high humidity regime initially grew faster but at the final harvest after 22 days, dry matter yields were the same. 2. In the high humidity treatment particularly towards the end of the experiment, the growth of the young leaves was disturbed and the plants showed symptoms resembling Ca or B deficiency. Analysis revealed that these tissues were lower in Ca than comparative tissues of the low humidity plants. The converse was true for B. 3. Cation uptake was little affected by the humidity treatment. However, the distribution of calcium within the plant was markedly influenced by humidity. In the high humidity treatment the level of Ca in the young leaves was very low and Ca accumulated in the stems. A high proportion of both Ca and Mg in these younger Ca deficient leaves was found to be associated with pectate. The same trend was observed in the stems, more of the Ca and Mg in this case being bound to oxalate as well as pectate. These results further indicate the possible significance of exchange movement of Ca particularly under low transpiration conditions when Ca transport by mass flow is restricted. 4. Xylem sap analysis showed a close cation-anion balance in all samples. NO3-ion was the predominant anion and the two major cations were K and Ca. This provides further evidence that the upper plant parts provide the major site of NO3-reduction in the tomato plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02185585
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