Abstract A qualitative assessment of the main types of zonal soils is necessary to assess the potential fertility of agricultural land. Soil bonitet analysis is used for cost-effective agriculture, determining the resource potential of agricultural land. Despite the many works devoted to soil evaluation, the definition of objective criteria and soil rating scales have not […]
Abstract From 2011 to 2013, in the water area of Kuibyshev Reservoir in the Kazan region (Russia), the artificial plots of land were created in the process of land reclamation. As a result, 600 hectares of flooded islands, breeding grounds, and channels were filled with sand. The system of artificial land plots was formed, connected […]
Abstract For removal of hardness salts, composite nanofiltration membranes with a “nylon-PS” polystyrene (PS) surface layer, a cellulose acetate (AC) surface layer on a nylon “nylon-AC” substrate, and a cellulose acetate surface layer on a polytetrafluoroethylene (PTFE) substrate were obtained “PTFE-AC”. To increase the retention capacity, several layers of polymer particles were applied to the […]
Abstract The paper presents the results of a study of the species diversity of freshwater Nizhniy Kaban Lake (Kazan, Russia) by the gene 18S rRNA based on the next-generation sequencing method. Nizhniy Kaban, Verhniy Kaban, and Sredniy Kaban Lakes are included in the system of urban Kaban Lakes, which are polluted lakes according to ecological […]
Abstract The article presents the results of a study of the bacterial diversity of Verhniy Kaban Lake (Kazan, Russia) for 2016-2017 using the marker gene 16S rRNA of hydrobionts based on the next-generation sequencing method. Verhniy Kaban Lake with Sredniy Kaban Lake and Nizhniy Kaban Lake are included in the system of Kaban Lakes. The […]
Abstract The summer season becomes difficult for chimney-type cooling tower. Due to the hot atmospheric air entering the apparatus, insufficient heat removal occurs, which means undercooling of water. Ultimately, this leads to a decrease in the power of the steam turbine of a thermal power plant. In the summer, an experimental study of the irregularity […]
Abstract In this work, studies were carried out on sorption treatment in dynamic conditions of the model solution of copper ions (II) sorbing material obtained by the treatment of sediment biological wastewater treatment with low-temperature pyrolysis. Research conducted for fractions with particle sizes less than 0.5 mm and 0.5-1 mm, 1-2 mm, 2-3 mm, 3 […]
Abstract Using nuclear gamma resonance (Mössbauer) spectroscopy in the backscattering geometry, the surface layers of graphite cast irons irradiated with nitrogen ion fluxes were studied. New phases were discovered and identified that are formed in the surface layers of the studied alloys during the implantation of nitrogen ions. A relationship has been established between the […]
Abstract The paper presents an analysis of methods for monitoring the flow and pressure of crankcase gases, a method for measuring the pressure of crankcase gases using the built-in diagnostic system. The authors investigated the prospects, advantages and disadvantages of the method of diagnosing an engine by the flow rate and pressure of crankcase gases, […]
Abstract The paper describes aspects related to the design stages of modern residential buildings. Reflected is the lack of requirements for the presence or absence of stagnant zones in residential premises of apartment buildings. Convective flows were simulated in the living room of a multi-room apartment of a multi-unit standard panel house. It is shown […]