Network of Social Groups or Let's Have a Party

Abstract

We present a simple model for growing up and depletion of parties due to the permanent communication between the participants of the events. Because of the rapid exchange of information, everybody is able to evaluate its own and and all other parties by means of the list of its friends.Therefore the number of participants at different parties can be changed incessantly. Depending on the deepness of the social contacts, which will be characterized by a parameter α, a stable distribution of party members emerges. At a critical α c an abrupt depletion of almost all parties is observed and as the consequence all the peoples are assembled at a single party. The model is based on a hierarchical social network. The probability that a certain person is contacted to another one depends on the social distance introduced within the network and homophily parameter α.

KLLdielectronic recombination resonant strengths of He-like up to O-like xenon ions

“…DR studies at storage rings are mostly focused on experiments with low electron-ion interaction energies, such as resonances involving a n = 0 excitation in a heavy few electron ions, or involving a n > 0 excitation in light ions [10][11][12][13][14][15][16][17]. Recently a new operational scheme at the GSI ESR storage ring was tested, and using this, it was possible to study KLL DR for H-like uranium [18]. In high-Z few electron ions, higher electron ion collision energies are needed for n > 0 DR processes, especially for those involving a K electron excitation.…”

Storage ring at HIE-ISOLDE

“…The latter experiment was carried out at the ultra-cold target station of the TSR storage ring and benefitted from its unprecedented experimental performance. The extension to unstable isotopes was demonstrated at the ESR: DR spectra of uranium and protactinium radionuclides produced in-flight have been measured for the first time [140,141]. Recently, the feasibility to extend the scope of the experiments also to nuclear isomers was realized in a test-run [142].…”