Please cite this article as: Barredo-Damas S., Alcaina-Miranda M. I., Iborra-Clar M. I. and Mendoza-Roca J. A., (2010), Application of nanofiltration/reverse osmosis membranes to textile effluents aiming its reclamation and reuse: influence of operating conditions, Chemical Engineering Transactions, 21, 1027-1032 DOI: 10.3303/CET1021172 Application of Nanofiltration/Reverse Osmosis Membranes to...

We introduce the notion of sink-stable sets of a digraph and prove a min-max formula for the maximum cardinality of the union of k sink-stable sets. The results imply a recent min-max theorem of Abeledo and Atkinson [1] on the Clar number of bipartite plane graphs and a sharpening of Minty’s coloring theorem [18]. We also exhibit a link to min-max results of Bessy and Thomassé [3] and of Sebő [...

A number of mathematical relations for the sextet polynomial are derived. A graph has been introduced (the so called C-graph), representing those properties of a benzenoid system which are essential in the sextet theory of Clar. The main structural properties of the C-graph are determined. The obtained results contribute towards a better understanding of the algebraic and combinatorial backgrou...

Benzene and pyrene can be synthetically linked to [o-COSAN]− keeping their aromaticity. In contrast, naphthalene anthracene are extruded in the same reaction. We have proven that extrusion is only favorable if number of Clar's π-sextets remains constant. Thus, Clar has answer whether an attached polycyclic aromatic hydrocarbon or not.

Toroidal, cylindrical, and helical analogs of C(60) buckyball are theoretically constructed and analyzed. In these structures, pentagons and heptagons are separated compactly by hexagons in analogy to pentagons in C(60) and heptagons in C(168) proposed by Vanderbilt and Tersoff (1992) [2]. Specifically, all nonhexagons therein are surrounded by hexagons and hexagons are surrounded alternatively...