A methodology for modelling and designing H∞ controllers for an experimental pilot-scale flotation column plant is described. Experimental results, including the modelling procedure and an H∞ design, are presented. For this purpose, different models, for different operating conditions, are determined, by means of system identification techniques. A strategy to get the uncertainty model, using a...

The function(s) of soluble silicates in repulpinghashing and flotation deinking of waste newsprint/magazine were investigated extensively, under optimized conditions. During repulping/washing, silicate ’s response was characteristic of a buffer and a detergent. It was responsible for a 3.0% increase in I S 0 brightness. In repulping/flotation, silicate accounted for a 6.1% increase in I S 0 bri...

Flotation tailings from copper production are deposits of copper and other valuable metals, such as Mo, V and U. New hydrometallurgical technologies are more economical and open up new possibilities for metal recovery. This work presents results of the study on the extraction of copper by mixed extractant consisting p-toluidine dissolved in toluene. The possibility of simultaneous liquid-liquid...

Clinical and histopathological findings in a litter of German Shepherd dogs consisting of seven puppies with acute inflammation confined to the footpads were reported. Affected footpads were characteristically erythematous, swollen and painful. Lesions were present on all four feet in 3/7 cases and on the rear feet in 4/7 cases. None of the dogs had evidence of ectoparasitism. Fecal flotation, ...

The influence of several parameters on removal of various impurities during vacuum flotation clarification of mixed juice has been investigated, and possible ways of dealing with the secondary precipitate obtained in this clarification process have been examined. Dispersed a~ir flotation clarification is described and the experience gained with this separation technique is recorded. Introductio...

There are an increasing amount and variety of disasters occurring throughout the United States. Many of these disasters require physicians to provide medical assistance. This article provides a brief introduction to disaster preparedness and its recent history and physicians' obligations, role, education, preparation, and response. It is the intent of this article to increase awareness and prov...

A fast method for separation, preconcentration and determination of cadmium in drinking (source, well, tap) and water for irrigation is described. Iron(III) hexamethylenedithiocarbamate, Fe(HMDTC)3, has the role of colloid precipitate flotation collector. The determination of cadmium in final water solutions preconcentrated by flotation can be performed by flame (FAAS) or electrothermal atomic ...

A dispersed-ozone flotation (DOF) separator was devised for a pilot study of tertiary wastewater treatment for re-use purposes. As a compact device combining coagulation, ozonation and flotation in an integrated unit, the DOF separator achieved a very high removal of SS, TOC, UV254 and colour, as well as effective inactivation of coliform and total bacteria within a short hydraulic retention ti...

war has devastating implications for families, communities, cultures, economies, and state infrastructure. similarly, the last decade has seen an increase in the number of attacks against health workers in conflict zones and unstable environments. unfortunately, these attacks have grave consequences for local populations which often rely on foreign aid programs for their health and well-being. ...