Dielectric response due to stochastic motion of pinned domain walls

We study the contribution of stochastic motion of a domain wall (DW) to the dielectric AC susceptibility for low frequencies. Using the concept of waiting time distributions, which is related to the energy landscape of the DW in a disordered medium, we derive the power-law behavior of the complex susceptibility observed recently in some ferroelectrics below Curie temperature.Comment: 5 pages, 2 figures, revtex

ON THE METHODOLOGY OF THE DESIGN OF TRANSPORT AND ECONOMIC BALANCE

The article contains a critical analysis of existing methods of forecasting of volumes of transport services on the basis of the analysis of the dynamics of volumes of commodity fl ows at the regional and Federal levels. The recommendations on use of diff erent methods of forecasting for the development of transport and economic balance are presented

Critical Behaviour of 3D Systems with Long-Range Correlated Quenched Defects

A field-theoretic description of the critical behaviour of systems with quenched defects obeying a power law correlations $\sim |{\bf x}|^{-a}$ for large separations ${\bf x}$ is given. Directly for three-dimensional systems and different values of correlation parameter $2\leq a \leq 3$ a renormalization analysis of scaling function in the two-loop approximation is carried out, and the fixed points corresponding to stability of the various types of critical behaviour are identified. The obtained results essentially differ from results evaluated by double $\epsilon, \delta$ - expansion. The critical exponents in the two-loop approximation are calculated with the use of the Pade-Borel summation technique.Comment: Submitted to J. Phys. A, Letter to Editor 9 pages, 4 figure

Orbital glass and spin glass states of 3He-A in aerogel

Glass states of superfluid A-like phase of 3He in aerogel induced by random orientations of aerogel strands are investigated theoretically and experimentally. In anisotropic aerogel with stretching deformation two glass phases are observed. Both phases represent the anisotropic glass of the orbital ferromagnetic vector l -- the orbital glass (OG). The phases differ by the spin structure: the spin nematic vector d can be either in the ordered spin nematic (SN) state or in the disordered spin-glass (SG) state. The first phase (OG-SN) is formed under conventional cooling from normal 3He. The second phase (OG-SG) is metastable, being obtained by cooling through the superfluid transition temperature, when large enough resonant continuous radio-frequency excitation are applied. NMR signature of different phases allows us to measure the parameter of the global anisotropy of the orbital glass induced by deformation.Comment: 7 pages, 6 figures, Submitted to Pis'ma v ZhETF (JETP Letters

Cyclopropanecarbaldehyde with two protected hydroxymethyl groups

3,5-Dioxabicyclo[5.1.0]octane-8-carbaldehyde was synthesized in three steps, including initial stereoselective exo-cyclopropanation of 1,3-dioxacyclohept-5-ene with ethyl diazoacetate. The subsequent phosphorylation according to Abramov and Kabachnik-Fields gave the corresponding α-hydroxy(acetoxy)- and α-aminocyclopropylmethylphosphonates with protected hydroxymethyl moieties at the three-membered ring. © 2007 Pleiades Publishing, Ltd

О МЕТОДОЛОГИИ РАЗРАБОТКИ ТРАНСПОРТНО-ЭКОНОМИЧЕСКИХ БАЛАНСОВ

The article contains a critical analysis of existing methods of forecasting of volumes of transport services on the basis of the analysis of the dynamics of volumes of commodity flows at the regional and Federal levels. The recommendations on use of different methods of forecasting for the development of transport and economic balance are presented.В статье проведен критический анализ существующих методов прогнозирования  объемов транспортных услуг на основе анализа динамики объемов товарных потоков на региональном и федеральном уровнях. Изложены рекомендации по использованию разных методов прогнозирования для разработки транспортно-экономического баланса

О МЕТОДОЛОГИИ РАЗРАБОТКИ ТРАНСПОРТНО-ЭКОНОМИЧЕСКИХ БАЛАНСОВ

The article contains a critical analysis of existing methods of forecasting of volumes of transport services on the basis of the analysis of the dynamics of volumes of commodity fl ows at the regional and Federal levels. The recommendations on use of diff erent methods of forecasting for the development of transport and economic balance are presented.В статье проведен критический анализ существующих методов прогнозирования объемов транспортных услуг на основе анализа динамики объемов товарных потоков на региональном и федеральном уровнях. Изложены рекомендации по использованию разных методов прогнозирования для разработки транспортно-экономического баланса