Low-energy renormalization of the electron dispersion of high-Tc_c superconductors

High-resolution ARPES studies in cuprates have detected low-energy changes in the dispersion and absorption of quasi-particles at low temperatures, in particular, in the superconducting state. Based on a new 1/N expansion of the t-J-Holstein model, which includes collective antiferromagnetic fluctuations already in leading order, we argue that the observed low-energy structures are mainly caused by phonons and not by spin fluctuations, at least, in the optimal and overdoped regime.Comment: 6 pages, 3 figure

Ultra-high energy cosmic ray investigations by means of EAS muon density measurements

A new approach to investigations of ultra-high energy cosmic rays based on the ground-level measurements of the spectra of local density of EAS muons at various zenith angles is considered. Basic features of the local muon density phenomenology are illustrated using a simple semi-analytical model. It is shown that muon density spectra are sensitive to the spectrum slope, primary composition, and to the features of hadronic interaction. New experimental data on muon bundles at zenith angles from 30 degrees to horizon obtained with the coordinate detector DECOR are compared with CORSIKA-based simulations. It is found that measurements of muon density spectra in inclined EAS give possibility to study characteristics of primary cosmic ray flux in a very wide energy range from 10^15 to 10^19 eV.Comment: 7 pages, 7 figures. Presented at CRIS-2006, Catania, Italy, May 29 - June 2, 2006. Accepted for publication in Nucl. Phys. B (Proc. Suppl.

New technique and results of cosmic ray investigations in the energy interval 1015–1019 eV

New technique of EAS investigations based on the measurements of local muon density spectra (LMDS) is developed. Application of this method to investigations of inclined EAS allows exploration of CR energy interval from 10 15 to 10 19 eV by means of a relatively small detector with area ∼100m 2 due to very strong dependence of EAS muon density on zenith angle. During 2002-2007, long-term NEVOD- DECOR experiment (about 20,000h live time) was conducted, and more than two million muon bundles in zenith angle interval 30-88 degrees were registered. Comparison of experimental data with results of CORSIKA-based simulations showed that the new method is sensitive to all main peculiarities of CR energy spectrum: the knee, increase of the energy spectrum slope with energy, the second knee. But the observed progressive excess of muon bundles with the increase of primary CR energy in comparison with simulations (even for pure iron composition) can indicate the appearance of new processes of muon generation. In this case, for correct investigations of EAS, the experimental arrays must be supplemented by detectors which can measure or evaluate the energy of muons

Methods of identification of phytopathogenic bacteria Pectobacterium carotovorum subsp. carotovorum

Bacterial infections are a global problem. The most common pathogens of infections among gram-negative bacteria are representatives of the Enterobacteriaceae family. Pectobacterium are gram-negative phytopathogenic bacteria belonging to the Enterobacteriaceae family.The purpose of the study is to develop methods for the identification of phytopathogenic bacteria. At the capacity of test components of developed identification algorithm, we used the data presented in the reference «Bergey’s Manual of Systematics of Archaea and Bacteria». research parameters and for selection of Model microorganisms bacteriological tests were reference strains of Pectobacterium carotovorum B-3455 obtained from the All-Russian collection of microorganisms and Pectobacterium carotovorum 333 from the collection of NRCEM Museum of FSBEI HE Ulyanovsk SAU named after P.А. Stolypin. From 50 samples of phytosanitary control and environmental objects, 5 strains were classified as Pectobacterium carotovorum spp. carotovorum

EFFECTIVE LEGAL MANAGEMENT OF INVESTMENTS - THE BASIS OF SUSTAINABLE ECONOMIC DEVELOPMENT

The main purpose of the study is to clarify the role and place of legal means in the mechanism of investment management. The paper deals with the problems of financing in the implementation of investment projects in the framework of public-private partnership, and examines the mechanism of coordination of public and private goals and interests in the implementation of projects. The methodology of the study was: system-structural approach, comparative legal method, functional method and method of interpretation. The main results of the study are as follows: based on the analysis of the application of the current transport and investment legislation, the conclusion is made about a certain imperfection of the implementation of the mechanism of public-private partnership in transport

Energy spectrum of cascade showers initiated by cosmic ray muons in the Cherenkov water detector

Results of analysis of experimental data on cascade showers with energies of 0.1 – 10 TeV initiated by muons in the Cherenkov water detector NEVOD are presented. The method of selection and reconstruction of cascade parameters in the volume of the detector is discussed. Experimental distributions of cascade axes in zenith angle and energy spectrum of cascades are obtained. The measured distributions are compared with results of calculations