Some data on pulverized matter from the region of the fall of the Tunguz meteorite

Soil sampling and analysis of Tungusk meteorite fall region for magnetite-silicate morpholog

Multi-vortex dynamics in junctions of charge density waves

Ground state reconstruction by creation of topological defects in junctions of CDWs is a convenient playground for modern efforts of field-effect transformations in strongly correlated materials with spontaneous symmetry breakings. Being transient, this effect contributes also to another new science of pump-induced phase transitions. We present a dynamical model for behavior of the CDW in restricted geometries of junctions under an applied voltage or a passing current. The model takes into account multiple interacting fields: the amplitude and the phase of the CDW complex order parameter, distributions of the electric field, the density and the current of various normal carriers. A particular challenge was to monitor the local conservation of the condensed and the normal charge densities. That was done easily invoking the chiral invariance and the associated anomaly, but prize is an unconventional Ginsburg-Landau type theory which is not analytic with respect to the order parameter. The numerical modeling poses unusual difficulties but still can demonstrate that vortices are nucleated at the junction boundary when the voltage across, or the current through, exceed a threshold.Comment: To be published in proceedings of the conference SUPERSTRIPES-2014, A. Bianconi ed., J. Supercond. Nov. Mag., (2015

Localization of a mobile impurity interacting with an Anderson insulator

Thermalizing and localized many-body quantum systems present two distinct dynamical phases of matter. Recently, the fate of a localized system coupled to a thermalizing system viewed as a quantum bath received significant theoretical and experimental attention. In this work, we study a mobile impurity, representing a small quantum bath, that interacts locally with an Anderson insulator with a finite density of localized particles. Using static Hartree approximation to obtain an effective disorder strength, we formulate an analytic criterion for the perturbative stability of the localization. Next, we use an approximate dynamical Hartree method and the quasi-exact time-evolved block decimation (TEBD) algorithm to study the dynamics of the system. We find that the dynamical Hartree approach which completely ignores entanglement between the impurity and localized particles predicts the delocalization of the system. In contrast, the full numerical simulation of the unitary dynamics with TEBD suggests the stability of localization on numerically accessible timescales. Finally, using an extension of the density matrix renormalization group algorithm to excited states (DMRG-X), we approximate the highly excited eigenstates of the system. We find that the impurity remains localized in the eigenstates and entanglement is enhanced in a finite region around the position of the impurity, confirming the dynamical predictions. Dynamics and the DMRG-X results provide compelling evidence for the stability of localization

Features of financial analysis in the environmental organization LLC «LEMVA»

This article is devoted to the peculiarities of financial analysis in an environmental organization. For effective financial analysis of a particular enterprise, it is relevant and necessary to assess the specifics of its activities, which affects the specifics of financial analysis. The purpose of the research in the article is to develop a methodology for financial analysis of an environmental enterprise, taking into account the specifics of its activities, for which both general scientific and private indicators of such an assessment were used. The tasks solved in the article include: determining the factors that define the features of the financial analysis of an enterprise in the environmental sector, developing and testing the author’s algorithm for the financial analysis of the enterprise, identifying the problems of the financial situation of the company and developing recommendations for conducting a qualitative financial analysis of an environmental enterprise. To achieve the set goals and objectives, the following methods were applied: of formalization, observation, statistical and dynamic comparative analysis, and economic experiment. The result of such a study was the determination of the features of the financial analysis of an enterprise in a particular industry (using the example of the environmental company LLC «LEMVA»). As a result of the analysis of the factors influencing the assessment of the activities of an environmental enterprise, the features of such an analysis are determined, the directions that should be paid special attention to when conducting it are highlighted

PROBLEMS OF TAXATION IN THE DIGITAL ECONOMY WITHIN THE EURASIAN ECONOMIC UNION

The article identifies the main problems of taxation in the digital economy in the countries of the Eurasian Economic Union. The authors specify the concept of digital economy. The problems of taxation of e-Commerce in the Eurasian Economic Union countries have been revealed. It has been proposed to consolidate the concept of e-Commerce in the tax legislation of the Eurasian Economic Union countries, as well as the application of new technologies to identify electronic transactions through using of modern tools. In order to implement the principle of certainty of taxation, a scheme for determining the location of the end user of electronic services has been developed. Possible ways to solve the problems of taxation caused by the application of business models of the digital economy have been proposed

Probing Spin-Charge Relation by Magnetoconductance in One-Dimensional Polymer Nanofibers

Polymer nanofibers are one-dimensional organic hydrocarbon systems containing conducting polymers where the non-linear local excitations such as solitons, polarons and bipolarons formed by the electron-phonon interaction were predicted. Magnetoconductance (MC) can simultaneously probe both the spin and charge of these mobile species and identify the effects of electron-electron interactions on these nonlinear excitations. Here we report our observations of a qualitatively different MC in polyacetylene (PA) and in polyaniline (PANI) and polythiophene (PT) nanofibers. In PA the MC is essentially zero, but it is present in PANI and PT. The universal scaling behavior and the zero (finite) MC in PA (PANI and PT) nanofibers provide evidence of Coulomb interactions between spinless charged solitons (interacting polarons which carry both spin and charge)

Modernization of tax control in the context of digitalization of the economy

Actual problems of modernization of tax control have been considered and proposals aimed at the development of tax administration in the context of digitalization of the economy have been formed. The risks of using big data in the tax sphere have been determined, the conclusion about the need for state regulation of the use of Big Data technology has been made. The purpose of the article is to substantiate the key areas of tax control modernization through the use of modern digital technologies, as well as to develop practical proposals for their implementation. Methods of system approach, analysis and synthesis, as well as abstraction and generalization have been used. It has been concluded about the need to develop legislation in the field of digitalization of the economy, state regulation of the use of big data technology, ensuring reliable database security and protection ofprivacy, as well as the creation of software for identifying transactions