Structural and electronic properties of heterointerfaces composed of complex ferroelectric oxides

The reported study was funded by RFBR according to the research project № 18-32-00595

Automatic defect recognition in corrosion logging using magnetic imaging defectoscopy data

The Magnetic Imaging Defectoscopy is designed for detection of corrosion zones in oil wells. Location of corrosion zones is a time-consuming process, during which some defects can be missed. Therefore this process shall be automated. This document describes an algorithm of automatic defect recognition based on maximum likelihood criterion and the use of wavelet threshold processing for noise reduction and pre-conditioning of experimental data

Electrical properties of heterointerfaces composed of complex ferroelectric oxides: an experimental investigation

The reported study was funded by RFBR according to the research project № 18-32-00595

Methodology for adjusting the standard frequency of vehicle maintenance based on data on actual fuel consumption

The use of reasonable standards for the technical operation of motor vehicles is the key to improving the efficiency of the transport process. Due to the fact that a number of standards for the technical operation of vehicles have not been updated for many years, an urgent problem is the improvement of methods for rationing the technological parameters of the technical operation of vehicles. The purpose of the study is: improving the efficiency of the operation of motor vehicles based on the development and implementation of a methodology for adjusting the frequency of maintenance by the amount of actual fuel consumption. The approach proposed by the authors is based on the hypothesis that the work performed by the nodes and aggregates of vehicles is equivalent to the total fuel consumption. Therefore, the use of this parameter as an argument for the function of determining the frequency of preventive actions allows us to more fully take into account the operating conditions of vehicles, the nature of the transport work performed, technical, resource and design features. Methods of mathematical analysis and statistical processing of the results of field surveys were used to develop a methodology for adjusting the frequency of preventive effects by the amount of total fuel consumption. As a result of the work done: a new methodological approach to the appointment of the frequency of preventive actions by the amount of total fuel consumption is proposed; a methodology for adjusting the basic norms of the frequency of maintenance of motor vehicles based on data on actual fuel consumption is developed, which allows to establish the values of total fuel consumption that determine the need for preventive maintenance. The scientific novelty of the work is: – methodical approach to the appointment of the frequency of preventive actions by the amount of total fuel consumption; – methodology for determining the values of total fuel consumption, determining the need to perform preventive actions; – the values of the coefficient of reduction of fuel consumption when driving on a standard driving cycle to the conditions of traffic on the highway, defined for different categories of vehicles and necessary for the practical application of the developed methodology. The practical significance of the results of the study is determined by a new approach to the appointment of the frequency of maintenance, which allows more fully to take into account the actual operational factors affecting the resource characteristics of vehicles. Based on the results of practical application of the developed methodology, it was found that when operating KAVZ-4235 buses in the city, the frequency of TO-2 can be increased by 30%, and outside the suburban area by 45%. Based on the data obtained, recommendations have been developed for the practical application of the presented methods for correcting the regulatory periodicity of the total fuel consumption. Forecast calculations of the frequency of technical services of the categories of vehicles under consideration have been performed

Aggregation kinetics at sedimentation: the impact of particles diffusion

We investigate the aggregation kinetics of sedimenting particles theoretically and numerically, using the advection-diffusion equation. Agglomeration, caused by both transport mechanisms (diffusion and advection), is important for small particles, like primary ash or soot particles in atmosphere, and large particles of equal or close size, where the advection mechanism is weak. For small Peclet numbers, which quantify the relative importance of diffusion and advection, we obtain the aggregation rates, as an expansion in Peclet numbers. For large Peclet numbers we use purely ballistic aggregation rates. Combining these results we obtain the rational approximant for the whole range of Peclet numbers. We also compute the aggregation rates by numerically solving the advection-diffusion equation. The results of the numerical simulations are in excellent agreement with the analytical theory for the studied Peclet numbers, varying by four orders of magnitude.Comment: 7 pages, 2 figures, 26 reference

Is anticoagulant therapy necessary after hospitalization with COVID-19 pneumonia?

The coronavirus disease 2019 (COVID-19) pandemic is associated with high virulence, mortality and healthcare burden around the world. One of its features is procoagulant activity, which leads to a high incidence of thromboembolic events in the lungs and other organs. Therefore, from the very onset of the moderate COVID-19, low molecular weight heparins began to be used as anticoagulants, which proved to have a beneficial effect on mortality and the disease course and were included in all guidelines. However, the question on anticoagulant therapy need after discharge from the hospital is controversial. The opinions of various medical professional communities on this issue are divided. In particular, some of them, including the Russian Ministry of Health guidelines recommend 30-45day anticoagulation using novel oral anticoagulants (dabigatran, rivaroxaban, apixaban), but other sources do not provide such recommendations. This review discusses the effectiveness of anticoagulant therapy after COVID-19, as well as the need to use stratification scales to assess this therapy

Object-oriented Programming Laws for Annotated Java Programs

Object-oriented programming laws have been proposed in the context of languages that are not combined with a behavioral interface specification language (BISL). The strong dependence between source-code and interface specifications may cause a number of difficulties when transforming programs. In this paper we introduce a set of programming laws for object-oriented languages like Java combined with the Java Modeling Language (JML). The set of laws deals with object-oriented features taking into account their specifications. Some laws deal only with features of the specification language. These laws constitute a set of small transformations for the development of more elaborate ones like refactorings

Experimental investigation of Ba0.8Sr0.2TiO3 (BSTO)/STO heterointerface

The reported study was funded by RFBR according to the research project № 18-32-00595

Ab initio insight into the electronic properties of heterointerfaces composed of nonpolar ferroelectric oxides

The reported study was funded by RFBR according to the research project № 18-32-00595. The research is carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University