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  • 1
    Electronic Resource
    Electronic Resource
    Modified site index equations for major Canadian timber species
    Amsterdam : Elsevier
    Forest Ecology and Management 64 (1994), S. 97-101 
    Details
    ISSN: 0378-1127
    Keywords: Constrained model ; Numerical method ; Weibull function
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0378-1127(94)90130-9
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A bi-segmental curve fitting approach to improve the accuracy of site index equations
    Amsterdam : Elsevier
    Forest Ecology and Management 67 (1994), S. 35-38 
    Details
    ISSN: 0378-1127
    Keywords: Bi-segmental curve fitting ; Constrained nonlinear model ; Fitting accuracy ; Height growth pattern ; Sum of squared error
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0378-1127(94)90005-1
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The calculation of the magnetic exponent in real space differential renormalization
    Amsterdam : Elsevier
    Physica A: Statistical Mechanics and its Applications 106 (1981), S. 589-602 
    Details
    ISSN: 0378-4371
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0378-4371(81)90128-X
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Theory of interfacial phase transitions in surfactant systems (1991)
    Springer
    Journal of statistical physics 63 (1991), S. 1053-1075 
    Details
    ISSN: 1572-9613
    Keywords: Water-oil-surfactant systems ; interfacial composition profiles and tensions ; wetting transition ; Ising model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spin-1 Ising model, which is equivalent to the three-component lattice gas model, is used to study wetting transitions in three-component surfactant systems consisting of an oil, water, and a nonionic surfactant. Phase equilibria, interfacial profiles, and interfacial tensions for three-phase equilibrium are determined in mean field approximation, for a wide range of temperature and interaction parameters. Surfactant interaction parameters are found to strongly influence interfacial tensions, reducing them in some cases to ultralow values. Interfacial tensions are used to determine whether the middle phase, rich in surfactant, wets or does not wet the interface between the oil-rich and water-rich phases. By varying temperature and interaction parameters, a wetting transition is located and found to be of the first order. Comparison is made with recent experimental results on wetting transitions in ternary surfactant systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029999
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Real space renormalization group theory of the percolation model (1994)
    Springer
    Journal of statistical physics 76 (1994), S. 477-495 
    Details
    ISSN: 1572-9613
    Keywords: Disordered systems ; percolation ; nonlocal degrees of freedom ; renormalization group theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A cluster expansion renormalization group method in real space is-developed to determine the critical properties of the percolation model. In contrast to previous renormalization group approaches, this method considers the cluster size distribution (free energy) rather than the site or bond probability distribution (coupling constants) and satisfies the basic renormalization group requirement of free energy conservation. In the construction of the renormalization group transformation, new couplings are generated which alter the topological structure of the clusters and which must be introduced in the original system. Predicted values of the critical exponents appear to converge to presumed exact values as higher orders in the expansion are considered. The method can in principle be extended to different lattice structures, as well as to different dimensions of space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02188671
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Model development for evaluating planting-stock production options in Ontario (1990)
    Springer
    New forests 4 (1990), S. 309-317 
    Details
    ISSN: 1573-5095
    Keywords: forest plantations ; nursery stock ; bare-root stock ; container stock ; black spruce ; white spruce ; jack pine ; regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract As a prelude to modeling regeneration in Ontario, the model “STOCK” was developed to assist forest nurserymen in evaluating their planting-stock production options. STOCK simulates the growth and survival of seedlings from seed-source selection to fully grown planting stock. The effects of various management options and cultural treatments (such as seed source, stock type, fertilization, thinning and pruning) on growth and survival may be simulated in accordance with empirical models or the user's expectations in the form of simple coefficients or improvement factors. The model simulates various stock-production options in accordance with the user's choices then optimizes the results on the basis of a calculated cost-efficiency index (CEI). In effect, CEI combines the total cost and stock production with growth, survival and the quality of the resulting planting stock. The model is written in both the FORTRAN 77 standard and in Apple BASIC.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00119209
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    Paper (German National Licenses)
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