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O. Nagy

Publications and source records attributed to O. Nagy.

2 recordsLinked to original sources

Bringing order to network centrality measures

We introduce a quantitative method to compare arbitrary pairs of graph centrality measures, based on the ordering of vertices induced by them. The proposed method is conceptually simple, mathematically elegant, and allows for a quantitative restatement of many conjectures that were previously cumbersome to formalize. Moreover, it produces an approximation scheme useful for network scientists. We explore some of these uses and formulate new conjectures that are of independent interest.

cs.SI

Energy Levels, Transition Probabilities and Electron-Impact Excitations Of Ge-Like Pr, Nd, Pm, Sm and Eu ions

Energies, wavelengths, transition probabilities, and oscillator strengths have been calculated for the 4s24p2-4s4p3, 4s24p2-4s24p4d and 4s4p3-4p4 allowed transitions in heavy Ge-like ions with Z=59-63. The fully relativistic Multiconfiguration Dirac-Fock (MCDF) method taking into account both the correlations within the n=4 complex and the quantum electrodynamic (QED) effects have been used in the calculations. MCDFGME code is used to calculate electron impact excitation cross sections for the 4s24p2-4s4p3 and 4s24p2-4s24p4d transitions with plane-wave Born approximation. The results of Pr XXVIII, Nd XXIX, Pm XXX, Sm XXXI and Eu XXXII are compared with HFR method results.

physics.atom-ph