Introduction: the article proposes a new method for recovering a spatially shared secret within the threshold principle based on sets of partial secrets belonging to subscriber groups, the number of which is limited from below by a specified threshold. Materials and methods of the research: to reduce the time spent on performing this operation, minimally redundant modular arithmetic (MRMA) is used as a computer arithmetic base. Unlike non-redundant analogs, MRMA possesses more efficient non-modular procedures, which makes it possible to optimize the decoding operation in the threshold MRMA-crypto-scheme of secret sharing. The results of the research and their discussion: a distinctive feature of the developed approach is the use of change areas for the original secret, which are rings of residues in moduli of the form of powers of 2. This greatly simplifies the decoding operation performed by the binary exponential division method. Conclusions: due to the noted features, the developed method for reconstructing the original secret using secret-mask codes surpasses the non-redundant counterparts by at least times (l is the number of subscribers restoring the original secret). At l = 7÷ 40, а (6.15 ÷ 34,65) - fold increase in productivity is achieved.

Introduction: in the capital-intensive chain, the search for a field, its exploration, production, processing, is a huge field for innovative technologies. An important role belongs to energy resources-oil and gas. Russia is one of the world's leading countries in their production and transportation. One of the most effective solutions for obtaining information about the oil and gas content of a field is the analysis of remote sensing data, since the fields are located on areas measured in hundreds of square kilometers, often in hard-to-reach places. Materials and methods of the research: the theoretical basis is the rotational concept of tectogenesis. And the components are represented by the most famous fluidodynamic model of B. A. Sokolov, the little-known geosoliton concept of R.M. Bembel and the concept of the nature of Central type structures (STC) of V.M. Kharchenko. The results of the study and their discussion: on the studied territory, areas with overlays of stretching zones (i.e., the overlap of stcts of the same or different rank) were identified, which forms an interference zone with the maximum possibility of fluid permeability. These areas are the most promising for the formation of brittle traps of various types, which is confirmed by drilling wells, namely, wells located within the selected area near the nodal point have maximum flow rates and open, as a rule, a section with the maximum saturation of reservoirs and the number of floors of oil and gas content. In some cases, this is confirmed by drilling wells and seismic studies on Velichaevskoe-Kolodeznaya square of the Eastern Caucasus. It should be particularly noted that none of the wells drilled hit the nodal point and did not naturally open the formation and the zone of sub-vertical destruction, where the maximum flow rates should be. Conclusions: as a result of the conducted research, it was revealed that the productivity of production wells is spatially related to the zones of sub-vertical destruction and overlapping areas of various sizes of SCT, allocated both from seismic data and from the results of decoding satellite images of various scales.

Introduction: The article discusses the reasons for shutting down production gas wells (PGW) and approaches to predicting the critical parameters in them to assess the need for transfer to the overhaul stage. The geological, technological and analytical stages of transferring wells to well workovers have been studied. Materials and methods of the research: The approaches to substantiating and assessing the impact of critical values of the bottom-hole formation zone parameters on the operation of the PGW for predicting the time of well shut-in are presented. The results of the study and their discussion: The main criteria are provided for assessing the efficiency of the PGW and the need to transfer the well to the workover program, which is a set of geological, technical, geological and production and production parameters that characterize the state of the bottom-hole formation zone, production wells and gas gathering network. The values of the threshold pressures for the Cenomanian productive formation were calculated, the values of the codes of the geological state of the wells by the formation pressure were assigned. The primary initial data for calculating the predicted flow rates of wells and their period of operation with a profitable level of flow rates of the PGW are presented. The conditions for selecting wells for successful workover have been determined, taking into account the value of the current reservoir pressure, which allows, at the required depression, to prevent the fallout of retrograde condensate in the bottom-hole formation zone. The main criteria for the selection of wells for workover, which allow obtaining potential super-, high- and medium well production rates, are stated. Conclusions: Well planning during the transition to workover is recommended to be carried out in three stages: geological, technological and analytical. A preliminary assessment of the feasibility of transferring wells to the overhaul stage makes it relatively easy to determine the sequence of well shutin, to identify from them that require immediate repair and (or) repair after a certain period of time. This assessment will allow assessing the effectiveness of repair work, optimizing their plans for carrying out, and reducing costs due to emergency failure of wells.

Introduction: Stavropol Krai is subdivided into several geomorphological areas. One of them is the Kuban Plain, bounded by the Kuban and Bolshoi Zelenchuk River valleys and administrative boundaries. It's a coastal plain up to 30 km wide with absolute altitudes of 150-200 m. Due to the peculiarities of the hydrogeological and geomorphological structure the landslide processes are typically for this territory. They pose a threat to settlements and economic facilities. The purpose of the paper was to study the scale of landslide distribution and the activity of their manifestations in the landslide zones of the Kuban plain. Materials and methods of the research: main research method was the analysis of various sources containing information on the distribution and activity of landslides in Kuban plain. Cartographic method was also used to visualize the landslide zones distribution in the study area. The results of the study and their discussion: conditions for activation and spread of landslide processes in the Kuban plain were analyzed. It was found that factors of landslide activation are: atmospheric precipitation, erosion and less frequently - groundwater level changes and technogenic impact. The main landslides and potential landslide areas, which are located on the slopes of the ravines and ledges of the fluvial terraces are united into three landslide zones, which are characterized by different manifestation activity and hazard level. Unfortunately, now it's impossible to present a complete picture of landslide development, as there are no large-scale landslide survey materials and no maps of the exact location of the main landslide massifs within the Kuban plain. Conclusions: systematization and analysis allow to assess the conditions, formation causes, scale of development and the regime of activation of the landslides in the Kuban Plain in 2005-2019. During this period, natural factors had the greatest impact on landslide activity. Regular observations allow to assess the degree of landslide activity in different zones of the Kuban plain. This process prevailed in the Kazminskaya landslide zone. The most significant landslide motions were observed in 2005, 2010, 2011, 2014, 2015, 2018. According to the survey results, the settlements most exposed to landslide processes were identified, and information on the scale of deformation of residential houses and economic facilities was provided.

Introduction: terrorism is young as an object of scientific study, but it has influenced the development of society since the XIX century. Its development combines social, ideological, religious, ethnic, and psychological components. It has many similarities with other forms of violence and protest: military conflicts, diversions, etc. It is necessary to determine the positions in which the geographical approach in the study of terrorism will be productive and relevant. Materials and methods of the research: the statistical base of the study is the Global Terrorism Database, developed by the government research organization The National Consortium for the Study of Terrorism and Responses to Terrorism. Terrorism is considered as a socio-territorial system, and the concept of territorial structures is applied to its geographical study. The results of the research and their discussion: the methodological basis for the geographical study of terrorism is defined. Based on the developed integral indicator of the intensity of terrorist activity, six world terrorist regions are identified. Their regional features, consisting in historical and geographical features, differences in qualitative and quantitative indicators of terrorist activity, are studied. Conclusions: terrorism and terrorist activities may be the subject of geographical research. At the global level, there are six terrorist regions that have a different set of specific features and features.

Introduction: a thunderstorm is a complex atmospheric phenomenon. The main signs of this phenomenon are multiple electrical discharges between differently charged regions of the cloud - cloud discharges, different clouds-inter-cloud discharges, or between clouds and the ground -ground discharges. Materials and methods of the research: the results of instrumental studies of thunderstorm activity and measurements of lightning discharge parameters were used to analyze the features of climatic characteristics of thunderstorms and assess the incidence of lightning on the territory and objects of the North Caucasus. The results of the study and their discussion: an experimental and theoretical study of the physical and statistical characteristics of thunderstorm activity and the damage to the territory and objects by lightning, typical for the South of the European part of Russia, was performed. Conclusions: a map of the average annual lightning strike rate in the North Caucasus is constructed. The map is based on instrumental observations about the number of days with thunderstorms and the earth's susceptibility.

Introduction: the paper considers the influence of human economic activity as an exogenous relief-forming process that affects the emergence of new forms of relief associated processes. The factors and forms of anthropogenic changes in the landscape are considered and the reasons for these changes are revealed. Materials and methods of the research: to determine the degree of influence of dangerous morphogenetic processes on the economic infrastructure on the territory of the Kumo-Manych depression, the structure of morphogenetic processes was determined. The results of the study and their discussion: the Kumo-Manych depression is characterized by the development of a whole complex of negative natural processes associated with both specific natural and climatic conditions and a high degree of anthropogenic load. Economic activity has intensified the processes of desertification. Groups of factors that have a significant impact on changes in morphogenetic processes are identified. Conclusions: the study made it possible to identify groups of facts and describe their share of participation in the morphogenetic transformation of the landscape. The first group is salinity - 61-42%. The second group consists of related processes - flooding and desertification and flooding. The third group consists of secondary erosion processes: wind and water erosion. The fourth group consists of morphogenetic processes expressed in: waterlogging, sedimentation, and abrasion. The contribution of other dangerous morphogenetic processes is insignificant. Among them, we can note the unfavorable processes of ravine formation.

Introduction: The tourism industry can become one of the backbone industries in the Stavropol Territory, contributing to the development of many sectors of the economy, the growth of employment and the achievement of indicators of the strategy of socio-economic development of the region. To create a tourism industry on a territory of any scale (district, city, museum-reserve), a comprehensive development of the potential is necessary, not fragmentary, but a powerful, full-scale association of all types of tourist resources. The most complete disclosure of the tourist and recreational potential of the Stavropol Territory, management and effective development of the tourism business directly depends on the use of modern innovative technologies. One of the most effective tools for such information support is the creation of integrated information systems based on advanced geographic information technologies. In the process of work, methods of geoinformation modeling and mapping, mathematical and statistical methods were used. The basic GIS platform is the QGIS geographic information system, which has a wide range of applications and tools for preparing cartographic models. The main source of information on the taxonomic units of the altitudinal zonality of vegetation was the SRTM raster data, which contains information about the altitude, multichannel satellite images of Sentinel, Landsat. The main source of the location of protected areas, hydro-mineral springs, monuments of history and culture, objects of tourist infrastructure were open data of the Ministry of Natural Resources and Environment of the Russian Federation, relevant ministries of the Stavropol Territory and cartographic materials of territorial planning schemes and master plans of municipalities. The paper presents the author's experience in developing a GIS project "Tourist and recreational resources and tourism of the Stavropol Territory". As a result, maps of the infrastructure of tourist and recreational development were obtained, which made it possible to establish the regularities of the territorial organization of the tourist and recreational space of the Stavropol Territory. The results were tested in the territorial planning scheme of the Stavropol Territory. Identification, definition and ranking of tourist and recreational zones of the Stavropol Territory were carried out on the basis of the analysis of the spatial distribution of tourist attractions and infrastructure in the GIS environment. The processes of spatial management and planning of industry development are inextricably linked to the processing, analysis and modeling of large data sets.The results presented in this work have shown the effectiveness of using GIS technologies for the operational analysis of the features of the spatial distribution of the elements of the supporting tourist and recreational framework. The proposed methodology and research results contain great potential for further formalization and interpretation of geodata.

Introduction: agglomerated territories are actively investigated by Russian scientists. Mostly, the works are devoted to the role of agglomerations in the sustainable development of territories; administrative, managerial, and town-planning aspects are considered. At the same time, in modern conditions, Russian agglomerations have become attractive for a multi-ethnic migration flow, which leads to a change in the ethnic structure of the population not only in the core cities, but also in suburban areas. This increases interest in the study of ethnic processes in urban agglomerations. The accumulation of new knowledge about the ethnic structure of the population of urban agglomerations, the influence of agglomerated forms of settlement on the formation of the ethnic composition of the peripheral territories, is an urgent task to study the spatial features of the country's population formation, makes a significant contribution to the updating of humanitarian, sociological and socio-geographical studies. Materials and methods of the research: the paper considers the features of the ethnic structure of the population of five urban agglomerations: monocentric- Volgograd GA, Rostov GA, Stavropol GA, Kazan GA, polycentric - GA Mineral Water (CMS). The agglomeration data differ in terms of population, number of urban and rural settlements. In the course of the study, a comparative analysis of the dynamics of the number of agglomerations prevailing in the number of ethnic groups was carried out, the distribution of the second and third ethnic groups, including the comparison for 2002 and 2010, was analyzed by cities and municipal areas. The results of the study and their discussion: features of forming the ethnic structure of the population of the Rostov, Volgograd, Stavropol, Kazan urban agglomeration and the agglomeration of Caucasian Mineral waters are considered. The general trends and regional features of the ethnic structure of the population are revealed. The general tendencies are a decrease in the proportion of Russians and other most urbanized ethnic groups (Ukrainians, Belarusians, Jews, Germans, etc.) and an increase in the number and proportion of ethnic groups with a lower level of urbanization. Conclusions: the study revealed general trends and regional characteristics of the formation of the ethnic structure of the population of urban agglomerations. Common to all agglomerations is the tendency to reduce the proportion of Russians and other, most urbanized ethnic groups (Ukrainians, Belarusians, Jews, Germans, etc.) and the increase in the number and proportion of ethnic groups with a lower level of urbanization.