By Frans Antonie Stafleu

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Extra info for A monograph of the Vochysiaceae 1. Salvertia and Vochysia

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Optimization is not restricted to a simple variable and several model parameters can be optimized simultaneously; the methods used are fully described in the book by Harbaugh and Bonham-Carter (1970). The adjustment of the parameters in a model leads, of course, only t o an improvement in its performance and leaves its basic structure unchanged but OPTIMIZATION OF MODELS 43 1 8O : 14 > I 0 01 5 ~ 1 r v01 02 03 ' . q ~ o r t > d dt,violions I > 01 0'2 03 s u m 01 squared deviations Fig. 1. Optimization of the free-fall experiment model.

3 show three important points. First, it is clearly seen that sedimentation rates increase during times of special tectonic activity. The Caledonian, the Variscian and the two Alpine periods of orogenesis are indicated by an asterisk in the European column and the increase in sedimentation rates is quite striking. Secondly, it will be noted that Bubnoff’s data do not seem to indicate a trend-like rise of sedimentation activity. Admittedly, the very value which is under the influence of tertiary mountain building is exceptionally high but otherwise the values fluctuate strongly but apparently not systematically.

A model can only fulfil certain functions and the only judgement which is possible is t o decide how well it fulfils these functions. For example, a theoretical model may be formulated and its performance can be tested against some real geological process. The previously mentioned theoretical volcano model may be used t o simulate a sequence of eruptions and this series may be compared with the history of an actual volcano, or, the theoretical model of free fall may be applied to some experiments and judgement may be given of how well it describes such a real situation.

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A monograph of the Vochysiaceae 1. Salvertia and Vochysia by Frans Antonie Stafleu

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