Neural network-based coronary dominance classification of RCA angiograms

Background. Cardiac dominance classification is essential for SYNTAX score estimation, which is a tool used to determine the complexity of coronary artery disease and guide patient selection toward optimal revascularization strategy. Objectives. Cardiac dominance classification algorithm based on the analysis of right coronary artery (RCA) angiograms using neural network Method. We employed convolutional neural network ConvNext and Swin transformer for 2D image (frames) classification, along with a majority vote for cardio angiographic view classification. An auxiliary network was also used to detect irrelevant images which were then excluded from the data set. Our data set consisted of 828 angiographic studies, 192 of them being patients with left dominance. Results. 5-fold cross validation gave the following dominance classification metrics (p=95%): macro recall=93.1%, accuracy=93.5%, macro F1=89.2%. The most common case in which the model regularly failed was RCA occlusion, as it requires utilization of LCA information. Another cause for false prediction is a small diameter combined with poor quality cardio angiographic view. In such cases, cardiac dominance classification can be complex and may require discussion among specialists to reach an accurate conclusion. Conclusion. The use of machine learning approaches to classify cardiac dominance based on RCA alone has been shown to be successful with satisfactory accuracy. However, for higher accuracy, it is necessary to utilize LCA information in the case of an occluded RCA and detect cases where there is high uncertainty

Structural-energy states of water and aqueous solutions under external influence

The surface state of alkaline-earth metals and magnesium oxides obtained by means of commercial and laboratory ways has been studied in this paper. A complex of methods has been used for identification, determination of a phase composition and morphology of the samples. The high basic character of surface centres has been shown with the help of pH-metry and adsorption of indicators methods. Acid-basic parameters (pHt, pHiis, etc.) can be used for the estimation of a general acid-basic state of metal oxides samples surface and for the supposition about different nature and strength of acid-basic centres as well as for the initial control in the process of acid basic properties of solid oxides surface properties evaluation

Geothermal energy for heating

This study examines issues related to the use of modern renewable energy sources and environmentally friendly minerals for the production of heat and electricity. The paper presents the principle of operation of a modern geothermal plant, which produces thermal energy for heating, in addition, an analysis of the costs of implementing projects in the field of heating with geothermal energy is carried out and presents the advantages and disadvantages of using geothermal energy. The work conducted domestic and foreign experience of using geothermal heating systems, which allowed the authors of the study to draw conclusions about the promise of introducing such technologies everywhere, due to which the electric power industry will reduce the burden on the consumption of organic fuels and increase the ecological and energy security of the regions. At the end of the work, the main conclusions on the results of the study were made

Industrial sector engineering staff development systems

This article discusses methods for the employees quality and performance improvement in the electric power industry enterprises. The characteristics of the factors influencing the development of personnel are given. The foreign experience of corporate training is analyzed, which identifies ways to improve labor activity, maintain labor discipline, increase the level of labor motivation, develop corporate culture and increase the employee loyalty at industrial enterprises. The structure of personnel training methods at the enterprise is schematically presented. The article substantiates the need for the formation of a qualified human resource that provides the company with the growth of economic indicators of production activity, a high degree of competitiveness in the industry market, and a positive image of the organizatio

Structural-energy states of water and aqueous solutions under external influence

The surface state of alkaline-earth metals and magnesium oxides obtained by means of commercial and laboratory ways has been studied in this paper. A complex of methods has been used for identification, determination of a phase composition and morphology of the samples. The high basic character of surface centres has been shown with the help of pH-metry and adsorption of indicators methods. Acid-basic parameters (pHt, pHiis, etc.) can be used for the estimation of a general acid-basic state of metal oxides samples surface and for the supposition about different nature and strength of acid-basic centres as well as for the initial control in the process of acid basic properties of solid oxides surface properties evaluation

Development of Bacteriostatic DNA Aptamers for Salmonella

<i>Salmonella</i> is one of the most dangerous and common food-borne pathogens. The overuse of antibiotics for disease prevention has led to the development of multidrug resistant <i>Salmonella</i>. Now, more than ever, there is a need for new antimicrobial drugs to combat these resistant bacteria. Aptamers have grown in popularity since their discovery, and their properties make them attractive candidates for therapeutic use. In this work, we describe the selection of highly specific DNA aptamers to <i>S. enteritidis</i> and <i>S. typhimurium</i>. To evolve species-specific aptamers, twelve rounds of selection to live <i>S. enteritidis</i> and <i>S. typhimurium</i> were performed, alternating with a negative selection against a mixture of related pathogens. Studies have shown that synthetic pools combined from individual aptamers have the capacity to inhibit growth of <i>S. enteritidis</i> and <i>S. typhimurium</i> in bacterial cultures; this was the result of a decrease in their membrane potential