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14 papers · 1 filter
Observations of planetary nebulae in the Galactic Bulge
F. Cuisinier, W. J. Maciel, J. Köppen +2
High quality spectrophotometric observations of 30 Planetary Nebulae in the Galactic Bulge have been made. Accurate reddenings, plasma parameters, and abundances of He,O,N,S,Ar,Cl…
Modeling Interacting Galaxies Using a Parallel Genetic Algorithm
Christian Theis, Stefan Harfst
Modeling of interacting galaxies suffers from an extended parameter space prohibiting traditional grid based search strategies. As an alternative approach a combination of a Geneti…
Measurement of Open Beauty Production at HERA
H1 Collaboration, C. Adloff
The first observation of open b production in ep collisions is reported. An event sample containing muons and jets has been selected which is enriched in semileptonic b quark decay…
Beyond Hebb: Exclusive-OR and Biological Learning
Konstantin Klemm, Stefan Bornholdt, Heinz Georg Schuster
A learning algorithm for multilayer neural networks based on biologically plausible mechanisms is studied. Motivated by findings in experimental neurobiology, we consider synaptic…
Chemical Evolution of Dwarf Irregular Galaxies - chemodynamical models and the effect of gas infall
Gerhard Hensler, Andreas Rieschick, Joachim K"oppen
Because of their low gravitational energies dwarf galaxies are greatly exposed to energetical influences by the interstellar medium, like e.g. stellar radiation, winds or explosion…
Modeling Encounters of Galaxies: The Case of NGC4449
Christian Theis
(abridged) Several N-body methods were combined in order to develop a method for the determination of the parameters of interacting galaxies. This method has been applied to the HI…