Kolmogorov scaling and intermittency in Rayleigh-Taylor turbulence

The Rayleigh--Taylor (RT) turbulence is investigated by means of high resolution numerical simulations. The main question addressed here is on whether RT phenomenology can be considered as a manifestation of universality of Navier--Stokes equations with respect to forcing mechanisms. At a theoretical level the situation is far from being firmly established and, indeed, contrasting predictions have been formulated. Our first aim here is to clarify the above controversy through a deep analysis of scaling behavior of relevant statistical observables. The effects of intermittency on the mean field scaling predictions is also discussed.Comment: 4 pages, 5 figure

Lecture-Conversation in Methodological Instrumentation of Russian as a Foreign Language Teacher

The article justifies the urgency of development of lectures-conversations when presenting the theoretical material of the training courses to foreigners. Attention is drawn to the difficulties of foreign students in listening the lecture in its traditional understanding as a monologue of the teacher. The importance of a methodical understanding of the theoretical presentation of the material in question-answer form is emphasised. Scientific novelty and practical significance of research results is seen in the fact that the issues are described from the point of view of the purpose of their performance to the students, the positive effect of the issue, the shortcomings of the question. It is assumed that within this form of classes the teacher can introduce new material, systematize theoretical information studied by students, consolidate students’ knowledge in the subject area, take into account communicative and personal aspects of adaptation of foreign students in Russian educational environment. On the original author’s material of lecture-conversation on theoretical grammar the kinds of questions are demonstrated that are appropriate to use in dialogue with foreign students. Methodological training for teachers in the formulation of various types of questions is proposed. It is concluded that the systematic use of lecture-conversation in teaching practice will contribute to overcoming the communicative and psychological difficulties of foreign students listening to lectures in a foreign language (Russian) that meets the modern trends of multicultural education

QUALITY CONTROL OF FOREST CHEMICAL PRODUCTS

This article discusses the quality control of forest chemical products. The conducted tests are described with obtaining quantitative and qualitative characteristics.В данной статье рассматривается контроль качества лесохимической продукции. Описываются проводимые испытания с целью получения количественных и качественных характеристик

BETULIN ANALYSIS TECHNIQUE QUALITY INDICATORS

This article discusses the quality indicators of betulin analysis techniques. The betulin production process control is presented. Instrumental methods of analysis are described.В данной статье рассматриваются показатели качества методик анализа бетулина. Представлен контроль процесса получения бетулина. Описаны инструментальные методы анализа

Microbiological diagnostics of pyoinflammatory abdominal diseases

The aim of the work was to establish the significance of complex bacteriological research in the diagnostics of acute appendicitis and to determine an optimal material for the research based on the findings. We examined 19 patients with acute phlegmonous or acute gangrenous appendicitis (males, aged 18-60 years). We performed bacteriological research of abdominal exudate (n = 19) and biopsy specimen (n = l9) of appendix wall taken before opening the lumen of the intestine. Both abdominal exudate and appendix wall specimen were taken at the same time. Aerobic and anaerobic microorganisms were detected and identified, antimicrobial susceptibility was tested. In total, we detected 25 strains of aerobic and 13 strains of anaerobic microorganisms. It has been established that a bioptate was most informative for testing (68.4 %); the parallel study of an abdominal exudate gave positive results in 21.1 % of cases. In the structure of clinically significant microflora dominated E. coli (43.3 %), then went nonfermentative gram-negative bacteria (13.3 %) and Bacteroides spp. (16.7 %). We marked growing resistance of detected strains of gram-negative bacteria to some antibiotics. For instance, 62 % of detected E. coli strains were resistant to ampicillin, 25 % - to ciprofloxacin. 92 % of strains were resistant to cefepime, 93 % -to ceftriaxone, 77 % - to Amoxiclav, 67 % - to gentamicin, 90 % - to tobramycin. From one bioptate a strain of E. coli ESBL was separated. The study of intraoperative bioptate of appendix wall increases effectiveness of microbiological diagnostics in comparison with the abdominal exudate research

Effects of inhomogeneous broadening on reflection spectra of Bragg multiple quantum well structures with a defect

The reflection spectrum of a multiple quantum well structure with an inserted defect well is considered. The defect is characterized by the exciton frequency different from that of the host's wells. It is shown that for relatively short structures, the defect produces significant modifications of the reflection spectrum, which can be useful for optoelectronic applications. Inhomogeneous broadening is shown to affect the spectrum in a non-trivial way, which cannot be described by the standard linear dispersion theory. A method of measuring parameters of both homogeneous and inhomogeneous broadenings of the defect well from a single CW reflection spectrum is suggested.Comment: 27 pages, 6 eps figures; RevTe