A further search on waves generated by solar energetic protons

It has been suggested that in the interplanetary medium Alfvén waves may be significantly amplified or damped during large solar proton events. This implies the increase or decrease of the ambient magnetic fluctuations in concurrence with the presence of the streaming particles, that we have analysed in a first study at times of eight proton events observed by Helios spacecraft (Valdés-Galicia and Alexander, 1997). However, it is not possible with interplanetary magnetic field measurements only to distinguish between waves moving away or towards the Sun in the frame of reference of the spacecraft. Plasma data for these eight events have now been made available to us and hence the energetic content of inward and outward propagating waves may be found, which is an important aid in our search for signatures left by the energetic protons. In the present work we incorporate the new information into the analyses of those events that in our first study showed more favourable evidence and therefore try to give a more definite answer as to whether it might be observed. The new results do not reinforce the evidence of our previous work, as they seem to be mildly consistent with the presence of the proton self-generated waves in just one of the three cases studied.     

Zur Adsorptionsbehandlung von Abwässern eines pharmazeutischen Betriebes

The activity of two adsorbent polymers on the basis of polystyrene and of an activated carbon for the removal of organochlorine substances as well as of substances which are characterized by the COD-Cr or the ultraviolet absorption in the wastewater of a pharmaceutical enterprise is assessed in batch and filtration experiments. The results show a good take-up of the organochlorine compounds by the polymers. Activated carbon showed partially the best values for process wastewater.     

On the Elimination of Organic Microcontaminants by Flocculation with Lime Hydrate

For the purpose of utilizing domestic flocculants for the treatment of water and of reducing by this the equivalent imports of metal salts, in this paper the result of investigations made on model waters and on a river water sample is described. The model waters contained the pesticides Atrazin, Diuron and 2,4-D, which partly were polluted in addition with different quantities of fulvic and humic acids as well as with colloidal substances causing turbidity (Friedland clay and finely dispersed cellulose). The investigations were supplemented by testing several adsorption media as γ-aluminium oxide, active carbon and diatom earth. In the presence of fulvic and humic substances one does not succeed in eliminating the investigated herbicides by flocculation with lime hydrate. Only after chemical side reactions between these contained substances the adsorbability is clearly influenced. The different elimination efficiencies at different reaction conditions are explained in detail.