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  • 11
    Electronic Resource
    Electronic Resource
    Cold tolerance of Tineola bisselliella (Lepidoptera: Tineidae) eggs at slow cooling rate
    Amsterdam : Elsevier
    Journal of Stored Products Research 29 (1993), S. 305-310 
    Details
    ISSN: 0022-474X
    Keywords: Clothes moths ; Tineola ; cold disinfestation ; models ; museum artifacts
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-474X(93)90045-6
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  • 12
    Electronic Resource
    Electronic Resource
    Time-mortality relationships for different species and developmental stages of clothes moths (Lepidoptera: Tineidae) exposed to cold
    Amsterdam : Elsevier
    Journal of Stored Products Research 29 (1993), S. 277-282 
    Details
    ISSN: 0022-474X
    Keywords: Tineidae ; cold tolerance ; disinfestation ; freezing ; mortality ; pest control
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0022-474X(93)90011-R
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  • 13
    Electronic Resource
    Electronic Resource
    Galerkin approximation for inverse problems for nonautonomous nonlinear distributed systems (1991)
    Springer
    Applied mathematics & optimization 24 (1991), S. 233-256 
    Details
    ISSN: 1432-0606
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We develop an abstract framework and convergence theory for Galerkin approximation for inverse problems involving the identification of nonautonomous, in general nonlinear, distributed parameter systems. We provide a set of relatively easily verified conditions which are sufficient to guarantee the existence of optimal solutions and their approximation by a sequence of solutions to a sequence of approximating finite-dimensional identification problems. Our approach is based upon the theory of monotone operators in Banach spaces and is applicable to a reasonably broad class of nonlinear distributed systems. Operator theoretic and variational techniques are used to establish a fundamental convergence result. An example involving evolution systems with dynamics described by nonstationary quasi-linear elliptic operators along with some applications and numerical results are presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447744
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  • 14
    Electronic Resource
    Electronic Resource
    The simulation of SST, sea ice extents and ocean heat transports in a version of the Hadley Centre coupled model without flux adjustments (2000)
    Springer
    Climate dynamics 16 (2000), S. 147-168 
    Details
    ISSN: 1432-0894
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Results are presented from a new version of the Hadley Centre coupled model (HadCM3) that does not require flux adjustments to prevent large climate drifts in the simulation. The model has both an improved atmosphere and ocean component. In particular, the ocean has a 1.25° × 1.25° degree horizontal resolution and leads to a considerably improved simulation of ocean heat transports compared to earlier versions with a coarser resolution ocean component. The model does not have any spin up procedure prior to coupling and the simulation has been run for over 400 years starting from observed initial conditions. The sea surface temperature (SST) and sea ice simulation are shown to be stable and realistic. The trend in global mean SST is less than 0.009 °C per century. In part, the improved simulation is a consequence of a greater compatibility of the atmosphere and ocean model heat budgets. The atmospheric model surface heat and momentum budget are evaluated by comparing with climatological ship-based estimates. Similarly the ocean model simulation of poleward heat transports is compared with direct ship-based observations for a number of sections across the globe. Despite the limitations of the observed datasets, it is shown that the coupled model is able to reproduce many aspects of the observed heat budget.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003820050010
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  • 15
    Electronic Resource
    Electronic Resource
    Parameter estimation techniques for interaction and redistribution models: a predator-prey example (1987)
    Springer
    Oecologia 74 (1987), S. 356-362 
    Details
    ISSN: 1432-1939
    Keywords: Parameter estimation ; Species interaction ; redistribution ; Heterogeneous environments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The use of parameter estimation techniques for partial differential equations is illustrated using a predatorprey model. Whereas ecologists have often estimated parameters in models, they have not previously been able to do so for models that describe interactions in heterogeneous environments. The techniques we describe for partial differential equations will be generally useful for models of interacting species in spatially complex environments and for models that include the movement of organisms. We demonstrate our methods using field data from a ladybird beetle (Coccinella septempunctata) and aphid (Uroleucon nigrotuberculatum) interaction. Our parameter estimation algorithms can be employed to identify models that explain better than 80% of the observed variance in aphid and ladybird densities. Such parameter estimation techniques can bridge the gap between detail-rich experimental studies and abstract mathematical models. By relating the particular bestfit models identified from our experimental data to other information on Coccinella behavior, we conclude that a term describing local taxis of ladybirds towards prey (aphids in this case) is needed in the model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378930
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  • 16
    Electronic Resource
    Electronic Resource
    Modeling insect dispersal and estimating parameters when mark-release techniques may cause initial disturbances (1985)
    Springer
    Journal of mathematical biology 22 (1985), S. 259-277 
    Details
    ISSN: 1432-1416
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We consider the problem of quantitatively modeling movements of marked flea beetles in cultivated arrays of the cole crop, collards (Brassica oleraceae). Methods for the estimation of temporally and spatially dependent parameters in general dispersal models are outlined and a summary of our findings using these methods with flea beetle data is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276485
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  • 17
    Electronic Resource
    Electronic Resource
    Parameter estimation techniques for transport equations with application to population dispersal and tissue bulk flow models (1983)
    Springer
    Journal of mathematical biology 17 (1983), S. 253-273 
    Details
    ISSN: 1432-1416
    Keywords: Parameter estimation ; Transport in tissue ; Insect dispersal ; Spline approximations ; Parabolic equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We develop techniques for estimating the coefficients, boundary data, and initial data associated with transport equations (or more generally, parabolic distributed models). Our estimation schemes are based on cubic spline approximations, for which convergence results are given. We discuss the performance of these techniques in two investigations of biological interest: (1) transport of labeled sucrose in brain tissue white matter, (2) insect dispersal that cannot be modeled by a random diffusion mechanism alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276516
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  • 18
    Electronic Resource
    Electronic Resource
    Statistical methods for model comparison in parameter estimation problems for distributed systems (1990)
    Springer
    Journal of mathematical biology 28 (1990), S. 501-527 
    Details
    ISSN: 1432-1416
    Keywords: Hypothesis testing ; Parameter estimation ; Partial differential equations ; Approximation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract In this note we outline some recent results on the development of a statistical testing methodology for inverse problems involving partial differential equation models. Applications to several problems from biology are presented. The statistical tests, which are in the spirit of analysis of variance (ANOVA), are based on asymptotic distributional results for estimators and residuals in a least squares approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00164161
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  • 19
    Electronic Resource
    Electronic Resource
    Estimation of growth and survival in size-structured cohort data: an application to larval striped bass (Morone saxatilis) (1991)
    Springer
    Journal of mathematical biology 30 (1991), S. 125-150 
    Details
    ISSN: 1432-1416
    Keywords: Size-structural population models ; Parameter estimation ; Growth and mortality rates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract We present a method for estimating growth and mortality rates in size-structured population models. The methods are based on least-square fits to data using approximate models (using spline approximations) for the underlying partial differential equation population model. In a series of numerical tests, we compare our approach to an existing method (due to Hackney and Webb). As an example, we apply our techniques to experimental data from larval striped bass field studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160331
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  • 20
    Electronic Resource
    Electronic Resource
    Approximation of nonlinear functional differential equation control systems (1979)
    Springer
    Journal of optimization theory and applications 29 (1979), S. 383-408 
    Details
    ISSN: 1573-2878
    Keywords: Functional differential equations ; nonlinear control problems ; semigroups ; approximation techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We develop a general approximation framework for use in optimal control problems governed by nonlinear functional differential equations. Our approach entails only the use of linear semigroup approximation results, while the nonlinearities are treated as perturbations of a linear system. Numerical results are presented for several simple nonlinear optimal control problem examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00933142
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