Search

This study presents the results of the development of numerical models for predicting the timing of apricot flowering, including using experimental data on the emergence of plants from a state of deep dormancy. The best results of approximation of the process of accumulation of the necessary cooling in the autumn–winter period were obtained using the sigmoidal function. Models that take into account the combined effect of temperature and photoperiod on the processes of spring development showed a high accuracy of the process of accumulation of thermal units. Based on the results of testing, two models were selected with an accuracy of 3.0 days for the start of flowering and the absence of a systematic bias, which can be considered a good quality assessment These models describe well the interannual variability of apricot flowering dates and can be used to predict these dates. The discrepancy is no more than 2–4 days in 87–89% of cases. Estimates of the timing of flowering and the end of deep dormancy are very important for increasing the profitability of fruit production in the South of Russia without incurring additional costs, by minimizing the risks associated with irrational crop placement and the selection of varieties without taking into account the specifics of climate change. When constructing a system of protective measures and dates of treatments, it is also necessary to take into account the calendar dates of the shift in the development of plants.

This study presents the results of the development of numerical models for predicting the timing of apricot flowering, including using experimental data on the emergence of plants from a state of deep dormancy. The best results of approximation of the process of accumulation of the necessary cooling in the autumn–winter period were obtained using the sigmoidal function. Models that take into account the combined effect of temperature and photoperiod on the processes of spring development showed a high accuracy of the process of accumulation of thermal units. Based on the results of testing, two models were selected with an accuracy of 3.0 days for the start of flowering and the absence of a systematic bias, which can be considered a good quality assessment These models describe well the interannual variability of apricot flowering dates and can be used to predict these dates. The discrepancy is no more than 2–4 days in 87–89% of cases. Estimates of the timing of flowering and the end of deep dormancy are very important for increasing the profitability of fruit production in the South of Russia without incurring additional costs, by minimizing the risks associated with irrational crop placement and the selection of varieties without taking into account the specifics of climate change. When constructing a system of protective measures and dates of treatments, it is also necessary to take into account the calendar dates of the shift in the development of plants.

This study investigated the interrelationships between the parameters of density, optical refraction, the volume fraction of ethanol and the total extract, using model solutions and samples of wine materials. The regularities of changes in refractometer readings in the process of alcoholic fermentation have been studied. The functional dependence of the value of the volume fraction of ethanol in the finished wine products on the density and scale of refractometer values has been established. A technique is proposed for controlling the process of alcoholic fermentation of grape must, based on the use of refractometry. Finally, we present an algorithm to calculate the composition (volume fraction of ethanol, mass concentration of the total extract) of the fermentation product from its physical properties (density, refractive index), the coefficient of determination was R2 = 0.975.

The aim of the study was to develop a methodology for calculating and optimizing devices for the magnetic exploration of fossils containing materials with a high magnetic permeability. The proposed technique is based on the calculation of electrostatic fields perturbed by conducting bodies and of magnetic fields perturbed by ferromagnets with a high magnetic permeability. It uses an integral equation of the first kind. This technique is preferable to the technique consisting in the use of an integral equation of the second kind, since in the situation under consideration, the latter does not have a unique solution and requires transformation. Prospects for the development of this area allow one to bring geophysical services to the service market on a new scientific and technical production level; reduce the environmental burden on nature by replacing magnetometric measurements with energy-saving, environmentally safe technology; and ensure the export potential of magnetometric equipment.

In recent years, artificial intelligence technologies have been developing more and more rapidly, and a lot of research is aimed at solving the problem of explainable artificial intelligence. Various XAI methods are being developed to allow the user to understand the logic of how machine learning models work, and in order to compare the methods, it is necessary to evaluate them. The paper analyzes various approaches to the evaluation of XAI methods, defines the requirements for the evaluation system and suggests metrics to determine the various technical characteristics of the methods. A study was conducted, using these metrics, which determined the degradation in the explanation quality of the SHAP and LIME methods with increasing correlation in the input data. Recommendations are also given for further research in the field of practical implementation of metrics, expanding the scope of their use.

The country's economy can be focused on the development of primary industries or innovation, the growth of which is based on the development of knowledge-intensive industries using information technology. The large-scale development of Internet technologies has made it possible to develop a model of network management of the economy. This also applies to the business of companies in the field of tourism and service. The widespread use of information technology will improve the competitiveness of companies and reach a new level of development. The article identified a range of issues for management in the organization of tourism and hospitality for the effective use of Internet technologies and e-commerce. The article deals with the use of software tools for analyzing incoming information, multimedia content and infrastructural public networks HTML, JavaScript, WWW, information-distributed infrastructure EDI, E-mail, HTTP, architecture of the e-commerce system, the scheme of automated formation of the educational process. The professional competencies of students of secondary vocational education, higher education and the system of additional professional training in the field of tourism and service should include knowledge, skills and abilities in organizing e-commerce using modern information technologies. The article considers the stages of using Internet technologies and e-commerce technologies, approaches to organizing these processes in tourist organizations and hotels. Continuous education in the field of e-commerce using information technology will allow developing the modern tourism and hospitality market at a high information level, improve the information literacy of sales specialists and managers of tourist organizations and hotels.

This paper presents an analysis of modern methods used to determine antioxidant activity. According to research by the World Health Organization, the deficiency of such important nutrients as antioxidants leads to a decrease in body resistance and the development of chronic diseases. When it comes to diet, the inclusion of foods with a high content of antioxidants helps to increase life expectancy. As a result of this research, the mass concentration of phenolic substances and the antioxidant activity of phenolic antioxidants in young white and red table wine materials were determined using amperometric and chemiluminescent methods in order to determine antioxidant activity. Regression equations reflecting the relationship between the indicator of antioxidant activity and the value of the mass concentration of phenolic substances in young table wine materials were derived. The conversion coefficient for determining the mass concentration of phenolic substances when using Trolox-C and gallic acid as standards was established, which was—3.75. Based on a multiple linear regression model, the total antioxidant activity of the samples (F9.5 = 19.10 and p = 0.0023) can be fairly accurately predicted with an R2 of 0.921 for the calibration data set. A neural network regression model (NNRM) was chosen for the machine-learning regression analysis of the antioxidant activity of the wine samples due to its effectiveness in predicting outcomes in various applications. The implementation was performed using the fitrnet function provided in the Statistics and Machine Learning Toolbox in MATLAB R2021b. The MSE of the calibration model was 0.056; however, the MSE for the three validation samples was much higher, at 0.272.

After the collapse of the Soviet Union, the centralized system of organizing tourism, excursion activities, hotel services, coastal sea passenger traffic ceased to exist. The company "Yalta Travel and Excursion Bureau",which organized excursions around the Crimea at the highest level, and also trained qualified guides, was closed. With the collapse of the all-Union system "Intourist", the training of highly qualified personnel of guide-interpreters with professional knowledge of foreign languages has practically ceased. The Yalta commercial seaport has practically lost the function of the main organizer of sea coastal and intercity passenger transportation (until 1991, about 40 passenger boats of the port operated during summer navigation. In the past, in 2020, there were only three ships). Private companies began to enter the market, which in the process of conquering market segments and competition have lost many achievements in tourism and excursion activities (including maritime ones). Today, many coastal passenger excursion routes are forgotten. Nevertheless, today's opportunities for organizing sea travel have significant potential.

The paper deals with some issues related to the study of the potential use of new types of high-speed passenger ships for the organization of maritime passenger traffic between the ports of the Black Sea. In addition, a project was proposed for organizing excursion passenger lines between the Black Sea and Mediterranean ports, as well as tours along the coastline. Recently, special attention has been paid to the development of sea tourism in the Black Sea. However, for the organization of this type of tourist activity, it is important to understand the possibilities of using special types of marine passenger ships developed by domestic designers. The implementation of design ideas in the very near future will make it possible to organize highly efficient maritime liner and cruise communications on the Black Sea.

The paper is devoted to the study of the dynamics and stability of the coast. The seaside territories are an active geodynamic system, which,being at the junction of the land and sea systems, has a high rate of change(transformation) processes. Relevance of the topic due to the economic value of the shores and a huge in-crease in anthropogenic load on them. A dynamic simulation model is presented to calculate the optimal amount of beachforming material to be maintained on the beach. The studies carried out made it possible to significantly clarify the ideas about the hydro- and lithodynamic processes occurring in the coastal zone of the beach. The influence of the parameters of waves and sediments that make up the beaches on such morphometric characteristics of the surf zone, which are important for the practice of marine coastal protection, such as the length and height of the wave run-up, the depth at the point of their collapse, is shown.