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Global climate has changed over the past century. Precipitation amounts and intensities are increasing. In this study we investigated the response of seven soil erosion models to a few basic precipitation and vegetation related parameters using common data from one humid and one semiarid watershed. Perturbations were made to inputs for rainfall intensities(More)
Human-subjects testing based on a sound formal model is outlined as an effective way to evaluate and refine computational models of spatial relations. The cognitive response of a subject (person) to a realworld situation depends on the characteristic of the situation and the characteristics of the subject. Spatial entities can be characterized by(More)
The great majority of existing geographic information systems have been designed by English or German speakers. Since human natural languages impose structure on the cognition and perception of space, time, and other concepts, GIS data models, and especially GIS query languages and human interfaces, can be expected to contain artifacts of the language(More)
X-ray microtomography is routinely used to image the three-dimensional pore space of sedimentary rocks. Flow and transport properties can then be simulated directly in such images. Advective transport in porous media is frequently simulated using streamlines. We present a novel streamline tracing algorithm based on a substantial development of the most(More)
The influence of parameter choice in the Monte Carlo simulation of zero-field-cooled-field-cooled magnetization curves of granular systems is analyzed. The main simulation techniques are summarized and compared, in terms of the determination of macroscopic quantities usually associated with nanoscopic details of the sample.
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