http://hdl.handle.net/10195/38120 Mon, 20 May 2013 06:05:05 GMT 2013-05-20T06:05:05Z http://hdl.handle.net/10195/32763 Title: Integrated pollution prevention and control and enterprises in the chemical industry Authors: Špaček, Ladislav; Hyršlová, Jaroslava Abstract: Enterprises are becoming increasingly active in their approach to protection of the environment. In the 80's and 90's of the 20th century, the strategy of prevention became increasingly important in Europe. These trends were reflected in the European Commission mainly through the Directive on Integrated Pollution Prevention Union countries since 1999. This paper is concerned with the integrated prevention process in the Czech Republic (CR). It concentrates mainly on the progress of this process in enterprises in the chemical industry and generalizes this information. Sat, 01 Jan 2005 00:00:00 GMT http://hdl.handle.net/10195/32763 2005-01-01T00:00:00Z http://hdl.handle.net/10195/32762 Title: Cholesteric fingersa review Authors: Pirkl, Slavomír; Oswald, Patrick Abstract: The behaviour of a cholesteric liquid crystal subjected to a topological frustration together with an a.c. electric field is described. The frustration comes from the homeotropic anchoring of the molecules on the two electrodes limiting the sample. This geometrical boundary condition is incompatible with the helical structure of the phase. As a result, the helix can partly unwind to form "cholesteric fingers" (CF) of different types in coexistence with the homeotropic nematic phase.We review their static and dynamic properties in electric field. Sat, 01 Jan 2005 00:00:00 GMT http://hdl.handle.net/10195/32762 2005-01-01T00:00:00Z http://hdl.handle.net/10195/32760 Title: Study of new colour pigments based on Bi2O3 Authors: Šulcová, Petra; Jurčíková, Dagmar Abstract: In this work we have studied the colour properties of the Bi2O3 -Ln2O3 system. By solid state reaction we have prepared the mixed oxides (Bi2O3)1-x(Ln2O3)x, where Ln=Er and Ho, with nominal compositions x=0.1, 0.3 and 0.5, and at calcination temperature 800 °C. The structure of prepared compounds was studied by X-ray diffraction analysis. The obtained orange oxide pigments present f.c.c. flurite-type structure. The colour properties measured in the visible region of light (400-700 nm) indicate that the pigments can be expected as new ecological inorganic pigments. Sat, 01 Jan 2005 00:00:00 GMT http://hdl.handle.net/10195/32760 2005-01-01T00:00:00Z http://hdl.handle.net/10195/32756 Title: Influence of ionic strenght and pH of dispersed feeds on microfiltration Authors: Šmídová, Dagmar; Mikulášek, Petr; Kőrösová, Mária; Wakeman, Richard J. Abstract: The fluences of particle shape, -potencial and size with change of pH and ionic strenght on permeate flux during the microiltration o model dispersions (two different china clays with mean particle sizes 3.5 m and 1.5 um) on flat sheet ceramic membranes (ZrO2, mean size o pores 0.2 mm) have been studied. The experimental filtration system and the dispersion characterisation experiments are presented. The results of the experiments show that -potential of the particleshas considerable impact on the magnitude of the cake resistance and hence on the permeate flux. The effects are especially pronounced during the microfiltration of dispersion in the area close to isoelectric point of dispersion, where the dispersionhas tendency to instability and the particles tend to aggregate. The effects resulted in higher porosity filter cakes (deposits) and a lower value of filter cake resistance, and hence to a permeate flux that increased to double the value of a non-treated dispersion. These observations are caused the particle interactions. Sat, 01 Jan 2005 00:00:00 GMT http://hdl.handle.net/10195/32756 2005-01-01T00:00:00Z