We analyzed human browsing behavior on a large-scale web-based system. Human-web interaction sequences were temporally segmented into blocks encompassing elemental and compound browsing tasks. Network representation of the human browsing behavior resembles a complex network. The complex network traversal topology has a small number of hubs. The hubs contract and disperse navigational pathways. ...

The partial retention of the disperse phase in the ultrafiltration of a monodisperse system through an isoporous filter is interpreted on a statistical basis, and a simple expression for the sieve constant is evaluated in terms of the calibrated membrane porosity and the particle size. Curves calculated from this expression are in reasonable agreement with experimental data for the ultrafiltrat...

Abstract Disperse Orange 1, colour index 11080, is an azo dye. Collectively, dyes are a common cause of textile-related allergic contact dermatitis (ACD). A 2006 European Union (EU) directive restricts the sale any articles or dyed items that have direct and prolonged with skin oral cavity contain more than 30-ppm dyes. These include wide range such clothing, bedding, furniture, toys yarn. Desp...

Four novel azo disperse dyes based on 1-4-bromobenzyl-4-phenylpiperazine were synthesized in two steps, using alkylation and azo coupling reactions. Chemical structure of the dyes was characterized and confirmed by the Ultraviolet Visible UV-Visible, Fourrier Transform Infrared FT-IR, Proton Nuclear Magnetic Resonance 1H NMR and Carbon Nuclear Magnetic Resonance 13C NMR analyses. The solvatochr...