[Formation and Unique Experience of the Center For the Treatment of Cerebrovascular Pathology in Children and Adolescents Located in a Multidisciplinary Pediatric Hospital, as the Only Primary Center of Pediatric Stroke in the Russian Federation].

Stroke is in the top ten causes of children death, ahead of brain tumors. Х-ray diagnostics development has significantly improved the detectability of pediatric stroke. The average incidence of cerebrovascular diseases in children was 13 per 100,000 children annually.

Bound on anisotropy in itinerant ferromagnets from random impurities.

We calculate the anisotropy energy of a single-domain ferromagnetic particle in which the only source of anisotropy is the presence of nonmagnetic impurities. Such anisotropy has easy-axis and easy-plane contributions, with random orientations of the axes. Typically the anisotropy energy is of order N1/2plankv/tau(so), where N is the number of electrons in the ferromagnetic particle and tau(so) is the spin-orbit time.

Surface superconductivity of dirty two-band superconductors: applications to MgB2.

The minimal magnetic field H(c2) destroying superconductivity in the bulk of a superconductor is smaller than the magnetic field H(c3) needed to destroy surface superconductivity if the surface of a superconductor coincides with one of the crystallographic planes and is parallel to the external magnetic field. While for a dirty single-band superconductor the ratio of H(c3) to H(c2) is a universal temperature-independent constant 1.6946, for dirty two-band superconductors this is not the case.

Fluctuations of g factors in metal nanoparticles: effects of electron-electron interaction and spin-orbit scattering.

We investigate the combined effect of spin-orbit scattering and electron-electron interactions on the probability distribution of g factors of metal nanoparticles. Using random matrix theory, we find that even a relatively small interaction strength significantly increases g-factor fluctuations for not-too-strong spin-orbit scattering (ratio of spin-orbit rate and single-electron level spacing 1/tau(so)delta < or near 1), and leads to the possibility to observe g factors larger than 2.