Density dependent hadron field theory for neutron stars with antikaon condensates

We investigate $K^-$ and $\bar K^0$ condensation in $\beta$-equilibrated hyperonic matter within a density dependent hadron field theoretical model. In this model, baryon-baryon and (anti)kaon-baryon interactions are mediated by the exchange of mesons. Density dependent meson-baryon coupling constants are obtained from microscopic Dirac Brueckner calculations using Groningen and Bonn A nucleon-nucleon potential. It is found that the threshold of antikaon condensation is not only sensitive to the equation of state but also to antikaon optical potential depth. Only for large values of antikaon optical potential depth, $K^-$ condensation sets in even in the presence of negatively charged hyperons. The threshold of $\bar K^0$ condensation is always reached after $K^-$ condensation. Antikaon condensation makes the equation of state softer thus resulting in smaller maximum mass stars compared with the case without any condensate.Comment: 20 pages, 7 figures; final version to appear in Physical Review

Enclosed plankton ecosystems in harbours, fjords, and the North Sea : release and uptake of dissolved organic substances

In IDL-1113

Naehrsalzverteilung in der Deutschen Bucht

TIB Hannover: RN 8908(85-067) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Tidal Estuaries: manual of sampling and analytical procedures

This "Manual" refers to a set of methodological descriptions of sampling strategies, sampling tools and methods for the study of chemical and biological variables in water and sediments of tidal estuarine environments

Erarbeitung eines Naehrstoffatlas der Nordsee Darstellung der Naehrsalzgradienten in der zentralen Nordsee

In the frame of the annual German Young Fish and Summer Fish Survey samples for nutrient analyses were taken and analysed from 1984 to 1998. Maps already existing until 1994 of surface distributions of nutrients, salinity and water temperature of the North Sea and bottom maps for summer seasons were completed until 1998 and supplemented by correlation diagrams. In standardized form vertical profiles crossing the central North Sea at 1.5 E and 56.5 N are presented visualizing the spatial expansion of nutrient-poor mixed layers and nutrient-rich bottom layers. Maps of means and corresponding standard deviations illustrate the most important influences on the nutrient regime of the North Sea and show areas of high interannual variability. Temporal developments were presented for selected areas and compared with the NOWESP data set. (orig.)Available from TIB Hannover: RN 8908(2000,26) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Umwelt, Naturschutz und Reaktorsicherheit, Bonn (Germany)DEGerman