Differences in high p_t meson production between CERN SPS and RHIC heavy ion collisions

In this talk we present a perturbative QCD improved parton model calculation for light meson production in high energy heavy ion collisions. In order to describe the experimental data properly, one needs to augment the standard pQCD model by the transverse momentum distribution of partons ("intrinsic k_T"). Proton-nucleus data indicate the presence of nuclear shadowing and multiscattering effects. Further corrections are needed in nucleus-nucleus collisions to explain the observed reduction of the cross section. We introduce the idea of proton dissociation and compare our calculations with the SPS and RHIC experimental data.Comment: Talk presented by G. Papp at Zakopane 2001 School, Zakopane, 2001 June; 10 pages with 3 EPS figure

Does the number or the composition of players matter on the mobile broadband markets? – Lessons from a benchmarking study of the large-screen mobile broadband prices in the European Union

Cross-country price comparison is a useful, but often deceptive exercise. The paper addresses the underlying methodological challenges, offering a practicable solution, which is both sound enough and meaningful for the comparison of prices on different markets. The simple and methodologically more sophisticated comparisons in turn give valuable insights into how the structural and also other factors associated with the price-differences between national markets

Does the number or the composition of players matter on the mobile broadband markets? Lessons from a benchmarking study of the largescreen mobile broadband prices in the European Union

Cross-country price comparison is a useful, but often deceptive exercise. The paper addresses the underlying methodological challenges, offering a practicable solution, which is both sound enough and meaningful for the comparison of mobile broadband prices on different markets. Both the simple comparisons and the econometric analysis give valuable insights into how the structural characteristics and also other factors are associated with the price-differences between national mobile markets of the European Union. The result suggests that the presence of a challenger player on the market is important to have lower prices and wider choice of options on the market. This factor seems more important than the mere number of the players

Saturating Cronin effect in ultrarelativistic proton-nucleus collisions

Pion and photon production cross sections are analyzed in proton-proton and proton-nucleus collisions at energies 20 GeV < s^1/2 < 60 GeV. We separate the proton-proton and nuclear contributions to transverse-momentum broadening and suggest a new mechanism for the nuclear enhancement in the high transverse-momentum region

The Norbornadiene/Quadricyclane Pair as Molecular Solar Thermal Energy Storage System: Surface Science Investigations

For the transition to renewable energy sources, novel energy storage materials are more important than ever. This review addresses so-called molecular solar thermal (MOST) systems, which appear very promising since they combine light harvesting and energy storing in one-photon one-molecule processes. The focus is on norbornadiene (NBD), a particularly interesting candidate, which is converted to the strained valence isomer quadricyclane (QC) upon irradiation. The stored energy can be released on demand. The energy-releasing cycloreversion from QC to NBD can be initiated by a thermal, catalytic, or electrochemical trigger. The reversibility of the energy storage and release cycles determines the general practicality of a MOST system. In the search for derivatives, which enable large-scale applications, fundamental surface science studies help to assess the feasibility of potential substituted NBD/QC couples. We focus on investigations under well-defined ultra-high vacuum (UHV) conditions as well as experiments in liquid phase. Next to mechanistic insights into the isomerization between the two valence isomers, information on adsorption geometries, thermal stability limits, and reaction pathways of the respective molecules are discussed. Moreover, laboratory-scaled test devices demonstrated the proof of concept in various areas of application

Disseminated eruptive giant mollusca contagiosa in an adult psoriasis patient during efalizumab therapy

Molluscum contagiosum is a common viral skin infection in children with atopic diathesis and not rare in HIV patients. We report a 45-year-old psoriasis patient who developed eruptive mollusca contagiosa during an antipsoriatic treatment with efalizumab. Copyright (C) 2008 S. Karger AG, Basel