Control by Pyragas method with variable delay: from simple models to experiments

The revival of interest in using models for developing countries for planning and policy advice makes it desirable to draw lessons from past experience. Simple models, focussed on specific issues, are to be preferred to large and comprehensive models. More empirical research is needed on supply and production functions for developing countries. Not statistical criteria but developmental considerations must determine the conclusions to be drawn from models. More explicit explanations of assumptions and modesty in presenting results of modelling work to policy makers are desirable.

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Development of simple models for agrichemical uptake into plant foliage

New Zealand Plant Protection ◽

10.30843/nzpp.2003.56.6033 ◽

2003 ◽

Vol 56 ◽

pp. 61-65

Author(s):

J.A. Zabkiewicz ◽

W.A. Forster

Keyword(s):

Vicia Faba ◽

Initial Dose ◽

Plant Leaves ◽

Linear Relationships ◽

Plant Foliage ◽

Mass Uptake ◽

Uptake Mechanisms ◽

Simple Models

Pesticide uptake into plants is typically reported as percentage uptake of the amount applied but in studies of the mechanism of cuticular penetration this approach has not been helpful It can be shown that relating percentage uptake to initial dose of bentazone applied to Vicia faba foliage cannot provide pertinent relationships that can be used to explain cuticular uptake mechanisms However applying the principles of Ficks Law and using mass or molar quantities does provide excellent linear relationships between mass uptake and initial dose applied Universal equations can be derived that relate dose uptake to initial dose applied onto plant leaves

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The Economic Significance of Some Simple Models of Time Series Stock Return Predictability

SSRN Electronic Journal ◽

10.2139/ssrn.151790 ◽

1999 ◽

Cited By ~ 3

Author(s):

Ben NMI1 Jacobsen

Keyword(s):

Time Series ◽

Stock Return ◽

Return Predictability ◽

Stock Return Predictability ◽

Economic Significance ◽

Simple Models

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Simple Models for the Volatility of Weather Derivative Underlyings

SSRN Electronic Journal ◽

10.2139/ssrn.477163 ◽

2003 ◽

Cited By ~ 3

Author(s):

Stephen Jewson

Keyword(s):

Simple Models

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Some Simple Models of Intersectoral Geowth

Artha Vijnana Journal of The Gokhale Institute of Politics and Economics ◽

10.21648/arthavij/1963/v5/i1/116927 ◽

1963 ◽

Vol 5 (1) ◽

pp. 26

Author(s):

Vatsala Mukerji

Keyword(s):

Simple Models

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The method for modeling the development of a gas field on the basis of a hierarchy of mathematical models

Tyumen State University Herald Physical and Mathematical Modeling Oil Gas Energy ◽

10.21684/2411-7978-2019-5-3-69-82 ◽

2019 ◽

Vol 5 (3) ◽

pp. 69-82

Author(s):

Vitaly P. Kosyakov ◽

Amir A. Gubaidullin ◽

Dmitry Yu. Legostaev

Keyword(s):

Mathematical Models ◽

Energy State ◽

Reservoir Pressure ◽

Gas Field ◽

Water Contact ◽

Simple Models

This article presents an approach aimed at the sequential application of mathematical models of different complexity (simple to complex) for modeling the development of a gas field. The proposed methodology allows the use of simple models as regularizers for the more complex ones. The main purpose of the applied mathematical models is to describe the energy state of the reservoir — reservoir pressure. In this paper, we propose an algorithm for adapting the model, which allows constructing reservoir pressure maps for the gas field, as well as estimating the dynamics of reservoir pressure with a possible output for determining the position of the gas-water contact level.

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