Non-perturbative effects for the Quark-Gluon Plasma equation of state

The non-perturbative effects for the Quark-Gluon Plasma (QGP) equation of state (EoS) are considered. The modifications of the bag model EoS are constructed to satisfy the main qualitative features observed for the QGP EoS in the lattice QCD calculations. A quantitative comparison with the lattice results is done for the SU(3) gluon plasma and for the QGP with dynamical quarks. Our analysis advocates a negative value of the bag constant B.     

Fluctuations and correlations in pion system with fixed isospin

The statistical system of π⁰, π⁺ and π⁻ mesons with zero total isospin is studied. For neutral pions there is the enhancement of the fluctuations, whereas for charged pions the isospin conservation suppresses fluctuations. The correlations between the numbers of charged and neutral pions are observed for finite systems.     

Direct measurements of auroral kilometric radiation in a limited source

The enhancement of auroral kilometric radiation near its lowest frequency has been detected in the polar edge of the auroral zone in the POLRAD experiment with the INTERBALL-2 satellite. The difference between the local electron cyclotron frequency and the lowest frequency of enhanced radiation is 8–20 kHz, indicating the closeness to the source of auroral kilometric radiation. According to the detailed analysis of low-frequency auroral kilometric radiation, its amplitude is larger than the “background” values by a factor of 20–70 and has amplitude modulation with characteristic periods of 40-60 s. The increase in the intensity at low frequencies is attributed to the intersection of the source region by the satellite and the detection of waveguide modes in it.     

On the colourless partition function of quark-gluon gas withSU(N c)-colour

The partition function of an ideal quarkgluon gas with a supplementary requirement for colourless states of a system to be realized is calculated. The effect of this requirement on the thermodynamical properties of a system, in particular, on the possibility of a phase transition between hadron and quark-gluon matter is discussed.     

The structure of multilayered titania nanotubes based on delaminated anatase

We constructed a truly nanotubular structure model of titania nanotubes based on delaminated anatase with realistic dimensions replicating those observed in experiments. It is shown that this nanotubular structure based on delaminated anatase produces an XRD pattern in excellent agreement with the observed spectrum and that the tube axis is along the [0 1 0] direction of the anatase structure. Preserving the atomic registry of delaminated anatase between adjacent layers is essential along the tube axis but unnecessary along the circumference. These understandings provide detailed information on the structure and morphology of hydrothermally synthesized titania nanotubes. The findings will help discern the complex surface chemistry of these materials.     

Mechanisms of deformation under shock loading

Mechanisms of deformation suggested as a means of describing the behavior of crystalline solids under shock loading are analyzed from the following standpoints: a history of the stressed state, experimental data on shock wave profiles, microstructural investigations, and a possible role of different defects. One of the most essential features of deformation under such extreme conditions is the possibility of shear generation in the dislocation-free regions. Computer modelling reveals some peculiarities of this process.     

Electron self-energy in nonlocal field theory

In the framework of quantum electrodynamics with the nonlocal interaction it is shown that the correspondence principle holds in the problem on the self-mass of an electron and a particle with arbitrary spin. It appears that the second order of perturbation theory in the limit ? → 0 gives just the classical expression for the electron self-energy, and all higher order corrections are zero.     

On a non-perturbative pressure effect in lattice QCD

We analyse Monte-Carlo data for the thermodynamical functions in lattice QCD. The linear in temperature non-perturbative contribution into the pressure of quark-gluon plasma is found.