[en] We present a numerical study of the existence and stability of topological solitons in helix polymeric macromolecules. It is shown on the example of polytetrafluoroethylene molecule that if taking into account deformations of valence bonds, torsion, and valence angles as well as interactions with neighbor chains, four types of localized defects can be revealed. One of them possesses a finite velocity spectrum in a subsonic region. Other defects are subjected to pinning and their mobility is manifested in thermally activated random jumps. Existence of four types of topological solitons is caused by chirality of the chain. We have shown the stability of solitons with respect to thermal vibrations of macromolecule. Accumulation of a solitonlike excitation near phase-transition temperature is observed. The appearance of localized oscillatory modes in the vicinity of topological solitons is predicted

[en] Many-body effects are hidden in the universal density functional. The interaction of degenerate states via two-body operators, such as the electron-electron repulsion (for describing multiplets or the interaction of molecular fragments at large separations) are thus not explicitly considered in the Kohn-Sham scheme. In practice the density functionals have to be approximated, and there is a fundamental difficulty which arises in the case of degeneracy. While density functionals should be universal, the effect of degeneracy is linked to the potential characteristic to the atom, molecule, or crystal. There are, however, several possibilities to treat degeneracy effects within density functional theory, a few of which will be discussed. These take profit of the use of two-body operators, which can be, but must not be, the physical electron-electron interaction

[en] Some ways of defining the pair correlation energies by means of local spin-density functionals are shown. Trends are deduced from numerical examples on atoms and molecules

[en] This paper describes the radioactive waste management activities at the Chernobyl Nuclear Power Plant. The discussion is focussed on the life cycle management of radioactive waste arisings from both operations and decommissioning -- plans for treatment, storage and disposal of Chernobyl NPP arisings are described. An inventory of wastes accumulated to date, and estimates for future arisings are also reported. (author)

[en] This paper describes the radioactive waste management activities at the Chernobyl Nuclear Power Plant (NPP). It shows that at present, the Chernobyl NPP site has accumulated a considerable amount of liquid and solid radioactive waste which is to be treated and handed over for disposal, and long-lived waste shall be handed over for temporary storage. Waste storage and disposal facilities design are described. The main RAW sources have been marked for which it is necessary to establish appropriate disposal and long-term storage sites. (author)

[en] The production of the neutral strange hadrons has been measured in the ep collisions at HERA using the ZEUS detector. The measurements are compared with theoretical predictions and with measurements made at e⁺e^- and pp-bar colliders. (author)

[en] An elliptic theory is constructed for operators acting in subspaces defined by means of odd pseudodifferential projections. Index formulae for operators on compact manifolds without boundary and for general boundary-value problems are obtained. A connection with Gilkey's theory of η-invariants is established

[en] This paper is concerned with elliptic theory on manifolds the boundary of which is a cover. Non-local boundary value problems are considered and their indices are calculated. The Atiyah-Patodi-Singer problem is studied on such manifolds. For non-trivial covers the defect of the index is calculated. The Poincare duality is constructed in K-theory on the corresponding singular manifolds.

[en] An elliptic theory is constructed for operators acting in subspaces defined in terms of even pseudodifferential projections. Index formulae are obtained for operators on compact manifolds without boundary and for general boundary-value problems. A connection with Gilkey's theory of η-invariants is established

[en] Nonrelativistic and quasirelativistic energy-adjusted pseudopotentials for fixed 4f subconfigurations of the rare earth elements La through Lu and corresponding optimized valence basis sets have been used in CI(SD) calculations to determine the molecular parameters of energetically low lying superconfigurations of selected lanthanide monoxides, monofluorides and trihalogenides. The experimentally observed trends in dissociation energies and bond lengths of the ground states belonging the calculated superconfigurations are well reproduced. (author). 24 refs,; 3 figs.; 3 tabs