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Global and local characteristics of ash mixture flows

100%

Sobota J., Plewa F.

Electronic Journal of Polish Agricultural Universities. Series Environmental Development

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2000

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tom 03

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nr 2

The results of flow experiments for several kinds of ash are presented. The experiments were carried out on the two laboratory stands at the Institute of Environmental Engineering, Agricultural University of Wroclaw. The pressure drop, limit deposit velocity, mixture density distribution in a cross-section of pipeline and pump characteristics are measured during these experiments. The measurements of density distribution were carried out by means of a device based on radiometric scanning, which enables us to determine these parameters without causing disturbances in the flow. The problem of limit concentration between Newtonian and non-Newtonian behaviour of mixtures is also discussed. The results of investigations into parameters of hydrotransport of ash and brine mixture in pipelines (80 and 100 mm) are presented. The investigations were carried out on the test laboratory installation at the Silesian Technical University of Gliwice.

2

Changes of the urban population density in central Poland. Population density distribution estimation using nonparametric kernel functions

84%

Jazdzewska I.

Człowiek i Środowisko

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2012

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tom 36

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nr 3

The article presents the results of the analysis of changes of the urban population density in Central Poland in the 20th century using one of the statistical methods meant for the estimation of discrete distributions, the so-called kernel function, and its brief characteristics. The studies cover the period, for which comparable data has been gathered (from 1931 to 2010). The results of the studies have been presented in a textual form and on 9 drawings, showcasing the changes of the population density in Central Poland in the analyzed period.

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