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The test calculations carried out by Stanley and Guiochon proved that their method is more accurate than several previous approaches (Jiec and Madey, 1988). One should also mention about an alternative theoretical approach to model adsorption by heterogeneous adsorbents that is based on the concept of quenched–annealed mixtures (Pizio, 2000).

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Spang potential measurements are reported on some thirty-five electronegative gases. Their value as replacement gases for SF6 has been analyzed in terms of their useful pressure range at lower