QCD Heat Kernel in Covariant Gauge

We report the calculation of the fourth coefficient in an expansion of the heat kernel of a non-minimal, non-abelian kinetic operator in an arbitrary background gauge in arbitrary space-time dimension. The fourth coefficient is shown to bring a nontrivial gauge dependence due to the contribution of the lowest order off-shell gauge invariant structure.Comment: 6 pages + title page, standart LaTe

QCD partition function in the external field in the covariant gauge

The QCD partition function in the external stationary gluomagnetic field is computed in the third order in external field invariants in arbitrary dimension and arbitrary covariant gauge. The contributions proportional to third order invariants in gluon field strength are shown to be dependent on covariant quantum gauge fixing parameter \alph

Comparative and International Legal Study on the Position of Irregular Migrants in the United Kingdom, Russia and South Africa: Issues of Their Internal Legal Capacity and Immigration Control Regimes

PhDThe present thesis deals with the legal position of irregular migrants in the three receiving societies, i. e. Britain, Russia and South Africa. Irregular migrants are an exploited underclass enjoying very few, if any, entitlements in the host countries and so long as their numbers are substantial their status becomes problematic both for them and the receiving society. To deal with these challenges, I propose that immigration policies or regimes, directly or indirectly related to regulation of the irregular migrants' position (internal legal capacity) are too restrictive and discriminatory for the position of irregular migrants and do not constitute an effective means of immigration control. In order to test this hypothesis, a socio-legal analysis of irregular migrants' position is made in the following spheres: entry, residence, employment (including temporary labour migration policies) and social welfare. The position of asylum seekers constitutes an integral part of the present analysis. The research led to two general conclusions in relation to irregular migration. First of all, irregular migrants should be granted at least a limited internal juridical capacity in the countries of residence. Secondly, there should be a more liberal labour migration policy and more balanced approaches to the humanitarian needs of immigrants. These liberal solutions could nevertheless be combined with rigorous internal control

On Collective Properties of Dense QCD Matter

A short review of the two recently analyzed collective effects in dense non-Abelian matter, the photon and dilepton production in nonequilibrium glasma and polarization properties of turbulent Abelian and non-Abelian plasmas, is given.Comment: 3 figure

THEORETICAL SEARCH FOR COLLECTIVE EFFECTS IN MULTIPARTICLE PRODUCTION

The properties of QCD vacuum and the confinement of quarks and gluons certainly influence the multiparticle production processes. Some phenomenological attempts of the consideration of related collective effects and the possibilities of their experimental detection are briefly discussed in this review. We consider in particular the correlation characteristics of pion systems, statistical and hydrodynamical analogies, the problem of phase transition from a quark-gluon plasma to a multipion state and the possible modifications of the evolution of the quark-gluon jets. The presentation is somewhat simplified and could be interesting for those only entering the field.Comment: 35 pages, LATEX, 3 Figs. (not included

Thermodynamics of oxygen in CaMnO3-δ

The experimental data for equilibrium oxygen content were used in order to extract increments of partial molar thermodynamic functions of oxygen with changes of oxygen stoichiometry in calcium manganite CaMnO3-δ. It is shown that along with the oxygen exchange reaction, thermal excitation of Mn4+ cations plays an important role in equilibration of charged manganese species that appear in response to the loss of oxygen at heating. The interrelation of partial molar enthalpy and entropy of oxygen with electron and ion defect formation parameters is obtained in approximation of the point defect model. The nearly linear changes of oxygen partial molar enthalpy are shown to directly reflect thermally driven changes in concentration of Mn3+ cations. © Springer-Verlag Berlin Heidelberg 2013

Electron transport in CaMnO3 - δ at elevated temperatures: A mobility analysis

The drift mobility of electron charge carriers in oxygen non-stoichiometric manganite CaMnO3 - δ was calculated by combining the total electrical conductivity and oxygen non-stoichiometry data at 700-950 ° C and oxygen partial pressure varying between 10-6 and 1 atm. The carrier concentration changes with pressure and temperature were obtained with the help of the earlier-developed defect model involving reactions of oxygen exchange and thermal excitation of manganese sites. The activation energy for mobility is found to increase with oxygen non-stoichiometry. High-temperature electron transport properties of the manganite CaMnO3 - δ can be explained in terms of activated jumps of n-type small polarons in adiabatic regime. The relatively small mobility of charge carriers is explained by strong localization of polarons on manganese sites. © 2013 Springer-Verlag Berlin Heidelberg

Defect equilibrium in PrBaCo2O5+δ at elevated temperatures

A defect equilibrium model for PrBaCo2O5+δ is suggested based on oxygen non-stoichiometry data. The model includes reactions of oxygen exchange and charge disproportionation of Co3+ cations. The respective equilibrium constants, enthalpies and entropies for the reactions entering the model are obtained from the fitting of the experimental data for oxygen non-stoichiometry. The enthalpies of oxidation Co2+→ Co3+ and Co3+→Co4+ are found to be equal to 115±9 kJ mol-1 and 45±4 kJ mol-1, respectively. The obtained equilibrium constants were used in order to calculate variations in concentration of cobalt species with non-stoichiometry, temperature and oxygen pressure. © 2013 Elsevier Inc