Influence of flow on thawing of underwater slopes and the pace coastal erosion of rivers, occurring in the permafrost zone

In the hydraulic laboratory of department of architecture & civil engineering RUDN University was performed studies of destruction of underwater and above-water coastal slopes in conditions simulating permafrost, depending on the soil type, the initial slope, and the slope angle. It was shown by authors, the speed of erosion of the underwater slope lags behind the speed of thawing of frozen ground. Water flow's influence is much higher than the impact of other factors (temperature, effect of wind, solar radiation), resulting in the formation of the washout niches. Thus, the main goal of the work was to identify the most important factors that affect on the changes of the river bed in permafrost zone.Keywords: experiment; frozen ground; erosion; water flow; permafrost zone

Mathematical rainfall model for hydrographic demarcation of Manabi (Ecuador)

To determine the average annual rainfall at a specific site in a basin, it is necessary to count with rainfall information in the study area and topographic information. Counting with base information, is comes to the filling of them data missing with the help of any of them methods statistical existing for the effect. Thiessen polygons are built. Based on this procedure, may be elaborated isohyet or curves of equal rainfall, that are an input that can help also to estimate of precipitation in a specific geographical site. Here is a methodology that allows creating with the help of geographic information systems (GIS), a mathematical model to estimate very accurately the values of rainfall based only on the geographical coordinates. To achieve this objective, the basins of the Hydrographic Demarcation of Manabí have been chosen to develop the indicated mathematical model, which can be applied to other basins in the world.Keywords: multiple regression; mathematical model; GIS; Hydrology; rainfall

ATRIAL FIBRILLATION IN A YOUNG PATIENT WITH A MYOCARDIAL BRIDGE

On the example of a clinical case of atrial fibrillation (AF) in a young patient with a myocardial bridge (MB) were considered anatomical and physiological features, diagnostics, differential diagnosis of AF, and the setting of a clinical diagnosis. Recommendations for the modification of the lifestyle, as well as the tactics of medication, are described

Reduction of harmful oscillations of definite frequence with rigit pressure stabilizer

Analysis and design of device for reduction of harmful pressure oscillations is described in this article. Is used characteristics method with constant time step

Determination of optimal perforation square in a cap under water hammer in pressure water lines

Pressure oscillations in water lines with air cap (pressure stabilizer) under water hammer are considered. Method of characteristics is used. Problem of optimal perforation square in a cap is investigated. A problem of optimal perforation square in an air cap is considered

Operation Safety Analyses of Pipe-Lines, Using Membrane-Discharge Device under Accidental Pressure Increase

A model of membrane-discharge device is described. Analysis of pressure oscillations and safety of operation, depending on its parameters is given

Forecast of change of levels when passing high waters in basins of the rivers Argun and Sunzha

Change of a water and water levels mode of the rivers when passing the maximum expenses by design probability of excess

Differential equations of unsteady motion of multiphase liquid

Differential equations of multiphase liquid with detailed description of its parameters is described in an article

Determination of free oscillations frequencies in water lines with elastic element

Pressure oscillations in water lines with elastic element are considered. D'Alamber method is used. Problem of determination of free oscillation frequencies is investigated

Reduction of Pressure Oscillations in Magistral Gas Tubes

The absorber pressure, the principle of action is based on the elastic-damping effect on the flow of gas have been considered