We evaluate the isospin breaking corrections to the scattering amplitude πK → πK at threshold in the framework of chiral perturbation theory. This channel is of particular interest for the strong 2S− 2P energy level shift in pion–kaon bound states. While a prediction of this level shift is hampered by a large uncertainty in the isoscalar scattering length, we find only a moderate uncertainty of...

We derive expressions for third-order matrix elements of oneand two-particle operators within the framework of relativistic many-body perturbation theory and use these formulas to evaluate specific-mass isotope shifts and isotope field shifts in atoms and ions with one valence electron. Third-order corrections to isotopeshift constants for 3s , 3p , and 3d levels in sodium and sodiumlike ions w...

The heavy-quark mass and wave function renormalizations, energy shift, and radiative corrections to two important couplings, the so-called kinetic couplings, in nonrelativistic lattice QCD are determined to leading order in tadpole-improved perturbation theory. The scales at which to evaluate the running QCD coupling for these quantities, except the wave function renormalization, are obtained u...

The nuclear magnetic resonance (NMR) spectroscopy combined with theoretical calculations is an important tool for fullerene identification. However, the accuracy of available theoretical methods is often not adequate. Therefore, in this work, different computational aspects needed to simulate realistically chemical shifts in the C70 molecule are investigated by density functional theory (DFT) c...

Pseudomonas aeruginosa is an opportunistic human pathogen that in most clinical situations is of low virulence. In the healthy host, inhaled bacteria are cleared rapidly by an arsenal of innate defence mechanisms including mucociliary clearance and immunological innate or acquired responses. In some clinical situations when the host defence fails, P aeruginosa can escape, multiply and cause sev...

This paper presents a measurement study of file system usage for a group of mobile devices users in different locations. The goal of this study is to dispel the idea that the behaviour of mobile systems can be modelled as being homogenous across various locations. The study shows that all volunteers access statistically significantly different sets of data as they move across locations. These r...