No abstract

This article is devoted to a detailed description of the developed physical model of the pneumatic classification process for detecting the rotating suspended layer and ensuring the frequency of loading and unloading of a pneumatic classifier. The related mathematical model is developed for estimating the non-stationary concentration of fine particles in a gas-dispersed flow with respect to time and height of the working space of the apparatus. The research is aimed at developing a pneumatic classification method for granular materials using a rhomb-shaped apparatus and ensuring the reliability of the operating process based on the influence of the flow on the granular material concentrations. The obtained experimental results allow evaluating the rational geometrical parameters of the working space in pneumatic granulators, as well as verifying the proposed mathematical model based on the implementation of the quasi-linear regression procedure. It is shown that the rhomb-shaped pneumatic classifier provides effective separation of granular material, reaching up to 95% of the target fraction. As a result, the proposed methodology can be implemented for optimizing geometrical profiles of pneumatic classifiers in terms of defining the required technological parameters of the pneumatic classification process.

Біоморфологічна детермінованістьEarly ontomorphogenetic specialization of Gymnospermium оdessanum (DC.) Takch. as ephemeroid geophyte has been recorded. Its extrapolation on the phylogenetic level as a ascertaining of the relative evolutional statics of the species was proposed.

Objective. To investigate the impact of the sorbtion-aspiration drainage system on background of hydroxyapatite and zinc oxide on experimental peritonitis. Materials and methods. The experiment was performed on 55 white laboratory rat males, ageing 2 - 3 mo, with the body mass 225 - 250 g, which were kept in the typical vivarium conditions. Suspension of E. coli in physiological solution, 1.0 - 1.5 ml in concentration 1010 , was used for the peritoneum contamination. The suspension was introduced into abdominal cavity in the dose, dependent on the animal body mass, using the syringe for insulin injection. Peritonitis in the rats was developed in 48 h and characterized by intoxication, which exaggerated rapidly, as well as by intestinal motor disorders and pronounced microcirculatory disturbances. The experimental animals were distributed into 5 Groups. In patients of Group I the interventions were not performed (control); in laboratory animals of Group II peritonitis was not simulated, but the abdominal cavity was drained, using the sorption-aspiration drainage system; in laboratory animals of Group III peritonitis was simulated; in the Group IV of laboratory animals on background of peritonitis the abdominal cavity was drained, using the sorption-aspiration drainage system; in the Group V animals the abdominal cavity was drained by a standard silicon drain on background of peritonitis. Results. Reduction of abdominal contamination by 43.12% and of histological features were produced in abdominal organs under the influence of the composite system, witnessing its bactericidal and sorption-antiinflammatory action. Conclusion. Experimentally there was confirmed the possibility of application of sorption-aspiration drainage system on background of hydroxyapatite and zinc oxide in treatment of an acute peritonitis.

No abstract