Neural Network Algorithm for Intercepting Targets Moving Along Known Trajectories by a Dubins' Car

The task of intercepting a target moving along a rectilinear or circular trajectory by a Dubins' car is formulated as a time-optimal control problem with an arbitrary direction of the car's velocity at the interception moment. To solve this problem and to synthesize interception trajectories, neural network methods of unsupervised learning based on the Deep Deterministic Policy Gradient algorithm are used. The analysis of the obtained control laws and interception trajectories in comparison with the analytical solutions of the interception problem is performed. The mathematical modeling for the parameters of the target movement that the neural network had not seen before during training is carried out. Model experiments are conducted to test the stability of the neural solution. The effectiveness of using neural network methods for the synthesis of interception trajectories for given classes of target movements is shown

SOME ASPECTS OF CHARGE STATIC FIELD POTENTIAL IN THREE- DIMENSIONAL ELECTRODYNAMICS

Obtaining the expicit expression for a point charge field potential in three-dimensional electrodynamics when the vacuum polarization is taken into account; comparison of the results obtained by the different methods of calculation. The present work is a continuation of Ref. [1]. It is of interest from the point of view of further studying the chiral symmetry dynamic breaking in QED 3 [2-11] and the properties of planar structures in solid physics [12-15]

Waste Management in Coal and Oil Industry in Context of Alternative Sources of Energy Development

The global energy landscape is changing. Traditional centers of demand are being overtaken by fast-growing emerging markets. Oil and coal exploration and production activities aside from a necessity, are responsible for various environmental accidents around the world. Inadequate treatment of those wastes can threaten the human health and safety as well as the environment. The article is dedicated to the actual problem today - the recycling of waste oil and coal industry and the search for ways to minimize their impact on the environment. In addition, the main goal of the work is to find ways of obtaining alternative energy in the process of waste processing. The authors analyzed the state of the oil and coal mining industry and considered the main ways of processing their waste. Among all analyzed methods of processing waste oil and coal industry, the authors pay special attention to the methods of thermal impact on waste, since they allow us to obtain an additional source of energy. Keywords: coal industry waste, oil industry waste, alternative energy, environment. JEL Classifications: Q32, Q42, Q53. DOI: https://doi.org/10.32479/ijeep.669

Evaluation of thermal properties of insulation systems in pitched roofs

The article outlines the basic requirements for pitched roof insulation systems. The analysis of the properties of thermal insulation materials used in insulation systems was conducted. It is substantiated that the thermal resistance of such structures on the surface of the roof is formed taking into account the thermal conductivity of thermal insulation, thermal conductivity of wooden rafters and heat loss through the leakiness of joints and mounting devices. An assessment was made of the effect of loads of various types on the heat-insulating layer, namely: the effect of the air flow in the ventilated gap; the movement of the vapor-air mixture in the material; condensation of water vapor and penetration of drip liquid; exfiltration of air at the joints of the plates and on the surfaces of contact with the supporting structures. The expediency of using products on the basis of unstitched polyethylene foam in the construction of pitched roofs with a wooden roof system, taking into account the advantages and features of this material, as well as taking into account the possibility of creating a seamless insulating shell, is substantiated

Разработка бизнес-плана открытия кафе-кондитерской "SweetCake" в г. Юрга

В работе были проанализированы теоретические основы бизнес-планирования; выявлены преимущества малого бизнеса и рассмотрены новые льготы для его поддержки; разработан бизнес-проект предприятия общественного питания "Кафе-кондитерская "SweetCake" в г. Юрга, а так же были просчитаны мероприятия, направленные на развитие кафе-кондитерской "SweetCake".In work theoretical bases of business planning have been analyzed; the advantages of small business are revealed and new benefits for its support are considered; the business project of the public catering enterprise "Cafe-confectionery" SweetCake "in Yurga was developed, as well as the activities aimed at the development of the cafe-confectionery" SweetCake "

Simultaneous Presentation of Ankylosing Spondylitis and Pancreatic Cancer: A Case Report

A clinical case of simultaneous presentation of ankylosing spondylitis and pancreatic cancer is described. Patients with rheumatic disorders must be closely followed to screen for malignancies. Most paraneoplastic rheumatic syndromes are difficult to distinguish from autoimmune rheumatic diseases; thus, cancer occurrence may constitute a major diagnostic challenge

Taxonomic diversity and abundance of enchytraeids (Annelida, Clitellata, Enchytraeida) in the Northern Palaearctic. 1. Asian part

Enchytraeids, or potworms, are tiny oligochaetes that are distributed worldwide in many terrestrial, freshwater and marine ecosystems. Despite their key role in the functioning of ecosystems, the diversity and abundance of Enchytraeidae are rarely studied due to the laborious process of species identification. The present study addresses this gap and sheds some light on the distribution and abundance of enchytraeids in the lands of the Northern Palearctic. The provided dataset constitutes the latest and comprehensive field sampling of enchytraeid assemblages across the Asiatic part of the Northern Palearctic, encompassing an original set of soil samples systematically collected throughout the region from 2019 to 2022.The dataset includes occurrences from 131 georeferenced sites, encompassing 39 species and 7,074 records. This represents the first dataset providing species-specific information about the distribution and abundance of terrestrial enchytraeids across an extensive geographic area covering the Asian sector of the Northern Palaearctic. The compiled dataset is the key for exploring and understanding local and regional enchytraeid diversity. It may also serve as a valuable resource for monitoring and conserving the entire soil biodiversity