Evaporation induced flow inside circular wells

Flow field and height averaged radial velocity inside a droplet evaporating in an open circular well were calculated for different modes of liquid evaporation.Comment: 5 page, 3 figures, submitted to European Physical Journal

Computer simulation and study of the IR spectra of irradiated polymer materials

Within the framework of MDDP the calculations of IR spectra have been performed for the initial polyethylene terephthalate (PET) and its state with the cation which satisfactorily describing experimental data. The calculations were made using the MDDP (modified neglect of diatomic differential overlap), implemented in the program MOPAC 2012. A feature of the method is that the overlap integrals are replaced by the [delta]-function, single-site Coulomb and exchange integrals are calculated by atomic parameters Slater-Condon. In recent years the studies of the structure and physico-chemical properties of polyethylene terephthalate and composites made on it basis have got the intensive development. Comparison of calculations with experimental data gives their satisfactory agreement

Internal scheme of the body assessment in an experiment with environmental uncertainty

The aim of the work was to analyze the influence of various environmental factors forming environmental uncertainty on the nature of the transformation of the "internal scheme of the body". Materials and methods. For the study, a group of healthy volunteers (n = 90) was selected. The results in this paper are median, 75 and 25 percentiles (Me [UQ / LQ]). The study was conducted in several stages. At the first stage, the criteria for excluding potential participants from the experiment were formed. At the second stage of the study, a video analysis of the main anatomical orientations of the pelvic region in static and dynamic samples was conducted for all participants. Conclusion. In the course of the study, specific patterns of spatial deviations of biomechanical blocks of the pelvic region were established, triggered by changes in the qualitative and quantitative parameters of the external environment. So, in conditions of static equilibrium, coordination is activated with involvement of the anterior and posterior half-rings of the pelvis (frontal biomechanical blocks); in conditions of dynamic equilibrium, diagonal biomechanical blocks of the pelvic region are activated; in conditions of deprivation of visual afferentation, the compensatory reactions of the lateral semirings of the pelvic region (lateral biomechanical blocks) are formed

Correlation effects during liquid infiltration into hydrophobic nanoporous mediums

Correlation effects arising during liquid infiltration into hydrophobic porous medium are considered. On the basis of these effects a mechanism of energy absorption at filling porous medium by nonwetting liquid is suggested. In accordance with this mechanism, the absorption of mechanical energy is a result expenditure of energy for the formation of menisci in the pores on the shell of the infinite cluster and expenditure of energy for the formation of liquid-porous medium interface in the pores belonging to the infinite cluster of filled pores. It was found that in dependences on the porosity and, consequently, in dependences on the number of filled pores neighbors, the thermal effect of filling can be either positive or negative and the cycle of infiltration-defiltration can be closed with full outflow of liquid. It can occur under certain relation between percolation properties of porous medium and the energy characteristics of the liquid-porous medium interface and the liquid-gas interface. It is shown that a consecutive account of these correlation effects and percolation properties of the pores space during infiltration allow to describe all experimental data under discussion

Nonlinear dynamics of magnetohydrodynamic flows of heavy fluid over an arbitrary surface in shallow water approximation

The magnetohydrodynamic equations system for heavy fluid over an arbitrary surface in shallow water approximation is studied in the present paper. It is shown that simple wave solutions exist only for underlying surfaces that are slopes of constant inclination. All self-similar discontinuous and continuous solutions are found. The exact explicit solutions of initial discontinuity decay problem over a flat plane and a slope are found. It is shown that the initial discontinuity decay solution is represented by one of five possible wave configurations. For each configuration the necessary and sufficient conditions for its realization are found. The change of dependent and independent variables transforming the initial equations over a slope to those over a flat plane is found.Comment: 43 pages, submitted to Theoretical and Computational Fluid Dynamic

Синтез халконов с изоксазольным фрагментом

The synthesis of new chalcones with potential biological activity, including the reactions of chloromethylation, N-alkylation, Claisen-Schmidt condensation, was carried out. The compounds obtained contain an isoxazole moiety in their structure.Проведен синтез новых халконов с потенциальной биологической активностью, включающий реакции хлорметилирования, N-алкилирования, конденсацию Кляйзена–Шмидта. Полученные соединения содержат в своей структуре изоксазольный фрагмент

Синтез пиримидиновых производных на основе халконов и их противомикробная активность

A series of substituted chalcones and pyrimidine derivatives on their base was synthesized. Obtained compounds were tested for antimicrobial activity and ability to increase activity of known antimicrobial substances. Pyrimidine products shown good activity against Staphylococcus aureus and Candida tropicalis. These compounds also could increase activity of modified polyguanidines against Staphylococcus aureus.Синтезирован ряд замещенных халконов и пиримидиновых производных на их основе. Исследована противомикробная активность полученных соединений, а также их способность усиливать действие существующих противомикробных средств. Синтезированные на основе халконов пиримидиновые производные обладают антибактериальной и противомикробной активностью, а также способны усиливать противомикробную активность существующих препаратов

АЛГОРИТМЫ ПОДАВЛЕНИЯ КОЛЕБАНИЙ ГРУЗОВ ПОДЪЕМНО-ТРАНСПОРТНЫХ МЕХАНИЗМОВ С ИСПОЛЬЗОВАНИЕМ НЕЧЕТКОЙ ЛОГИКИ ФУНКЦИОНИРОВАНИЯ

The algorithms to suppress oscillations that occur during the movement of payload by hoisting-and-transport mechanism are presented. The use of fuzzy logic provides quite simple to implement a control unit and take into account actual constraints of drives. Anti-sway control based on fuzzy logic has a good performance, even in the case of changing length of the payload cable in a wide range, as it’s shown by simulation.Приведены результаты разработки и исследования алгоритмов подавления колебаний с нечеткой логикой функционирования для перемещения грузов с помощью подъемно-транспортных механизмов. Произведен анализ эффективности управления с нечеткой логикой функционирования, исследовалась чувствительность системы управления к изменениям длины подвеса