The local phase transitions of the solvent in the neighborhood of a solvophobic polymer at high pressures

We investigate local phase transitions of the solvent in the neighborhood of a solvophobic polymer chain which is induced by a change of the polymer-solvent repulsion and the solvent pressure in the bulk solution. We describe the polymer in solution by the Edwards model, where the conditional partition function of the polymer chain at a fixed radius of gyration is described by a mean-field theory. The contributions of the polymer-solvent and the solvent-solvent interactions to the total free energy are described within the mean-field approximation. We obtain the total free energy of the solution as a function of the radius of gyration and the average solvent number density within the gyration volume. The resulting system of coupled equations is solved varying the polymer-solvent repulsion strength at high solvent pressure in the bulk. We show that the coil-globule (globule-coil) transition occurs accompanied by a local solvent evaporation (condensation) within the gyration volum

The Actual Knowledge of the Student Youth About the Opportunities for Health-Improving Resources Exploitation and Self-Preservation Behaviour Motivation

The article helms the reader to the results of the investigation conducted to reveal the actual knowledge of the student youth about the opportunities they have at their disposal to preserve their health and their self-preservation behaviour motivation. The analysis of the results of the questionnaire survey of the samples of young students of a regional polytechnic training college has shown that in spite of the well-known ample opportunities for health resources exploitation the student youth can experience problems associated with social, cultural and geographical specifics as well as with the level of education

Formation of Self-Preservation Behavior in Russian and Foreign Students with Health Risk Factors

The article presents the results of a study carried out with the purpose of identifying motivation for self-preservation in Russian and foreign students with correctable and non-correctable health risk factors. The results of a representative survey of Russian and foreign students show that despite the abundance of health risk factors, most of them are correctable. At the same time, many students have some unsolved problems in the formation of self-preservation behavior, caused by both the presence of risk factors themselves, and also by the students' life-style, social and cultural peculiarities

Health management: scientific approaches to the study of students’ health and self-preservation behavior

The article presents the results of the analysis of the main scientific approaches to the study of students’ attitudes towards health and self-preservation behavior. The authors analyze the sociologically relevant theories and approaches to the formation of healthy lifestyles and self-preservation behavior. The paper states that the sociological approach to the self-preservation behavior is the most promising way to the promotion of healthy living. Despite the students diverse motivation for self-preservation behavior there are still serious problems in its formation due to both social and cultural factors

Acceleration of the adaptation processes in foreign students with cronic associated viral infection: perspective and possibility (as a result of study in programme «Health»)

The study was research high frequency of chronic associated pathology in the adopted students. These diseases caused delay of adaptation processes, decrease of immunity and increase of morbidity. It was offered the methods of adaptation processes acceleration and morbidity reduction methods in students with chronic pathologic conditions

New possibility of the latent disease detection in students using the screening method in programme «health»: introduction and efficacy

The new method of the latent chronic disease detection in students using the screening was invented in programme «Health». It was research in students from the different climatogeographic regions for the detection of gastrointestinal disease. The special screening questionnaire designed by us was used in the study. The perceptibility and the diagnostic specificity was studied and estimated. The efficacy of screening use for gastrointestinal disease early diagnostic was ascertained as a result of study. It was marked the significant spread of intestinal dysbacteriosis in students form different climatogeographic regions in adaptation period

Heterogeneity of the local structure in sub- and supercritical ammonia : a voronoi polyhedra analysis

We report results of molecular dynamics simulations and detailed analysis of the local structure of sub- and supercritical ammonia in the range of temperature between 250 and 500 K along the 135 bar isobar. This analysis is based on the behavior of distributions of metric and topological properties of the Voronoi polyhedra (VP). We show that by increasing the temperature, the volume, surface, and face area distributions of the Voronoi polyhedra as well as the vacancy radius distribution broaden, particularly near the temperature T-alpha, where the calculated thermal expansion coefficient has its maximum. Furthermore, the rate of increase of the corresponding mean values and fluctuations increases drastically when approaching T-alpha. This behavior clearly indicates that the local structure, as described by the VP, becomes increasingly heterogeneous upon approaching this temperature. This heterogeneous distribution of ammonia molecules is traced back to the increase of the large voids with increasing temperature, and is also clearly seen in the behavior of the fluctuation of the local density, as measured by the VP. More interestingly, the maximum in the heterogeneity coincides with the maximum of the fluctuation in the density of the VP