Sekundärrohstoffe aus Abfall-Lösungen

Every year about 40 000 m³ of waste solutions from photographic fixing and developing processes are produced in Germany. A new method of reclaiming some base chemicals (silver, fixing salt, gypsum and ammonia) from these solutions has been developed for black and white photographic processes. The remaining waste water has a low COD-value and low concentration of dissolved salts. This method is considered further to develop the state-of-the-art technique and is economically feasible.     

A critical review of the water quality classification system in Turkey: A case study on Meric Basin

An 11-year period of water quality data, collected by the Directorate of Sate Water Works of Turkey are thoroughly analyzed for the purpose of implementing water quality classes to water resources in the Meric Basin, located on the European land mass of Turkey. Water quality parameters are divided into four groups as physical, organic, inorganic, and bacteriological. The quality class of each group is evaluated by taking into account the poorest quality of any parameter in the group, after which a quality rank is assigned to the sampling station and the waterbody in question. This method of water quality classification imposed by the Turkish Water Quality Act, is then criticized with respect to a statistical approach.     

Neutronensterne als Quellen kosmischer Röntgenstrahlung

Unlike single neutron stars which appear as radio pulsars, neutron stars in close binary systems emit intense X-radiation. These superdense objects are of interest not only as the end stages of stellar evolution but also as physical laboratories which are dominated by superstrong gravitational and magnetic fields and in which matter densities and temperatures attain extreme values.