Production of Secondaries in High Energy d+Au Collisions

In the framework of Quark-Gluon String Model we calculate the inclusive spectra of secondaries produced in d+Au collisions at intermediate (CERN SPS) and at much higher (RHIC) energies. The results of numerical calculations at intermediate energies are in reasonable agreement with the data. At RHIC energies numerically large inelastic screening corrections (percolation effects) should be accounted for in calculations. We extract these effects from the existing RHIC experimental data on minimum bias and central d+Au collisions. The predictions for p+Au interactions at LHC energy are also given.Comment: 18 pages and 10 figure

Production of secondaries in soft p+pb collisions at LHC

We calculate the inclusive spectra of secondaries produced in soft (minimum bias) p+Pb collisions in the framework of Quark-Gluon String Model at LHC energy, and by taking into account the inelastic screening corrections (percolation effects). The role of these effects is expected to be very large at very high energies, and they should decrease the spectra about 3 times in the midrapidity region and increase them about 2 times in the fragmentation region at the energy of LHC.Comment: 18 pages and 10 figures. arXiv admin note: text overlap with arXiv:0802.219

Radio labeling with pre-assigned frequencies

A radio labeling of a graph G is an assignment of pairwise distinct, positive integer labels to the vertices of G such that labels of adjacent vertices differ by at least 2. The radio labeling problem (RL) consists in determining a radio labeling that minimizes the maximum label that is used (the so-called span of the labeling). RL is a well-studied problem, mainly motivated by frequency assignment problems in which transmitters are not allowed to operate on the same frequency channel. We consider the special case where some of the transmitters have preassigned operating frequency channels. This leads to the natural variants p-RL(l) and p-RL(*) of RL with l pre-assigned labels and an arbitrary number of pre-assigned labels, respectively. We establish a number of combinatorial, algorithmical, and complexitytheoretical results for these variants of radio labeling. In particular, we investigate a simple upper bound on the minimum span, yielding a linear time approximation algorithm with a constant additive error bound for p-RL(*) restricted to graphs with girth = 5. We consider the complexity of p-RL(l) and p-RL(*) for several cases in which RL is known to be polynomially solvable. On the negative side, we prove that p-RL(*) is NP-hard for cographs and for k-colorable graphs where a k-coloring is given (k =3). On the positive side, we derive polynomial time algorithms solving p-RL(*) and p-RL(l) for graphs with bounded maximum degree, and for solving p-RL(l) for k-colorable graphs where a k-coloring is given

Die Wege junger Erwachsener aus dem Arbeitslosengeld-II-Bezug durch eine Arbeitsmarktintegration

The study explores routes off benefits through labour market integration for young adults in Germany. Policies for young people are focused on a rapid integration into employment or training to prevent long-term benefits dependency. The causes of long-term benefits receipt can be related to poor labour market opportunities. But in political and public discourse, long-term benefits dependency is most widely regarded as the consequence of young adults' low labour supply. The article examines the labour market transitions of 650 beneficiaries aged 18 to 24. The analysis combines survey data on beneficiaries in Germany and longitudinal register data for 2005 to 2007. Though most of the young adults surveyed enter employment or vocational training, a high percentage continues to receive benefits. Long-term benefits receipt is related to low levels of qualifications and young parenthood; there is no evidence for young people resigning themselves to benefits receipt