Sulpho - telluride ore

The problem considered in this work, is the determination of a suitable scheme for cyaniding a low grade Cripple Creek ore. For several years many attempts have been made to solve the metalurgical sic problem presented by such ores --page 1

The Removal of Flourides from Water by Ionic Exchange

Mottled enamel is the term originated by McKay to describe the disfigurement of teeth which Smith and others discovered was caused by the presence of fluorides in drinking water. Since then considerable time, energy and money have been spent in an effort to find an economical method of removing fluorides from drinking water. At first the use of activated carbon and activated alumina were rather promising; but more recently the use of tricalcium phosphate to remove fluorides from water has been developed (2). A patent by Adams and Holmes (1), wherein it was claimed that the sulphate ion concentration could be reduced nearly to zero, suggested that the fluoride content of water might be reduced to a permissible value by anionic exchange. Such a method of fluoride removal was investigated as a part of the research program concerning water treatment which has been in progress for many years at Iowa State College

Jet-torus connection in radio galaxies: Relativistic hydrodynamics and synthetic emission

High-resolution Very-Long-Baseline Interferometry observations of active galactic nuclei have revealed asymmetric structures in the jets of radio galaxies. These asymmetric structures may be due to internal asymmetries in the jet, could be induced by the different conditions in the surrounding ambient medium including the obscuring torus, or a combination of the two. In this paper we investigate the influence of the ambient medium (including the obscuring torus) on the observed properties of jets from radio galaxies. We performed special-relativistic hydrodynamic (RHD) simulations of over-pressured and pressure-matched jets using the special-relativistic hydrodynamics code \texttt{Ratpenat}, which is based on a second-order accurate finite-volume method and an approximate Riemann solver. Using a newly developed emission code to compute the electromagnetic emission, we have investigated the influence of different ambient medium and torus configurations on the jet structure and subsequently computed the non-thermal emission produced by the jet and the thermal absorption due to the torus. To better compare the emission simulations with observations we produced synthetic radio maps, taking into account the properties of the observatory. The detailed analysis of our simulations shows that the observed asymmetries can be produced by the interaction of the jet with the ambient medium and by the absorption properties of the obscuring torus.Comment: 14 pages, 17 figures, submitted to A&