Numerical modeling of air flows in mines under emergency state ventilation

The algorithm of loop flows has been modified to calculate emergency air distribution in quasi-stationary approximation, with regard to air inertia in estimation of fast unsteady-state processes. The author mathematically describes changes in thermal-physical characteristics of mine air, including the air compressibility, as well as analyzes thermodynamic influence on the mine air flow. The discussed information material is illustrated with the numerical calculation results for a number of the emergency ventilation regimes.     

Criteria for constructing remote protection with monitoring of current increases from power swinging and asynchronous behavior

A procedure for ensuring correct operation of remote protection together with monitoring of the increase in current under swinging and asynchronous behavior conditions is considered. Relations are derived which enable an estimate to be made of the behavior of the protection and enable the requirements on the arrangements of the protections under swinging and asynchronous behavior conditions to be determined, for which they function correctly in power systems with specified parameters.     

The influence of Chernobyl nuclear power station disaster on the erythropoietic cells in the microenvironment of the liver

Erythropoesis activation, realizing by microenvironmental cells, was noted in hepar of the tailless amphibians R. Lessonae and R. Ridibunda, living in the Chernobyl AES alienation zone. Destructive changes, and the ribosome-protein complexes, fibrillar structures synthesis intensification was revealed in hepatocytes. Ribosome-protein complexes and fibrillar-granular material of hepatocytes enter the blood stream, where they incorporate into the erythroblasts cytoplasm. Focal hyperplasia and macrophages hypertrophy were revealed. Macrophages, transporting the hepatocytes cytoplasm components into erythroblasts and supplementing them with their cytoplasm synthesis products, take an active part in supply of differentiating red blood cells with different materials.     

Energy-saving mine ventilation

The authors show three methods of energy saving in mine ventilation: recirculating airing, minimization of main mine fan pressure by privative adjustment, and two-parameter optimization of fan performance (by rotary velocity and angle of blades). Energy saving using any of the methods is illustrated in the article.     

Lattice damage and secondary phase formation in Yttria stabilised zirconia implanted with Fe at different temperatures

In this paper we report on the lattice damage and nanocrystalline secondary phase formation in Fe implanted Yttria stabilised zirconia (YSZ) up to a peak concentration of 10%. The implantation temperature has been varied between room temperature and 1000 °C. Samples were characterized using Rutherford backscattering/channeling and X-ray diffraction. We observed that (1) YSZ remains partially crystalline even after Fe implantation at room temperature and the lattice damage can be partially recovered if implantation is performed at elevated temperatures; (2) crystalline bcc-Fe nanoparticles have formed and grown with increasing implantation temperature. The nanoscale Fe precipitates and the YSZ matrix have a crystallographic orientation relationship.     

Hybrid materials based on MF-4SK membranes modified with silicon carbide and carbon nanotubes

The effect of hydrophobic silicon carbide nanoparticles and carbon nanotubes on the mechanical and transport properties of MF-4SK perfluorinated cation-exchange membranes has been studied. It has been shown that the modification of the membranes with a small amount of silicon carbide and carbon nanotubes enhances both their mechanical strength and selectivity of transport processes. An increase in the dopant concentration leads to deterioration of these parameters and the destruction of the membranes. This change in the properties is attributed to the implantation of nanoparticles into the hydrophobic membrane matrix, which results in a decrease in its elasticity.