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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">inform</journal-id><journal-title-group><journal-title xml:lang="ru">Информатика</journal-title><trans-title-group xml:lang="en"><trans-title>Informatics</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1816-0301</issn><issn pub-type="epub">2617-6963</issn><publisher><publisher-name>UIIP NASB</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.37661/1816-0301-2023-20-3-61-73</article-id><article-id custom-type="elpub" pub-id-type="custom">inform-1256</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕМАТИЧЕСКОЕ МОДЕЛИРОВАНИЕ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICAL MODELING</subject></subj-group></article-categories><title-group><article-title>Моделирование электростатического поля заряженного кольца, расположенного внутри бесконечного цилиндра в присутствии тора</article-title><trans-title-group xml:lang="en"><trans-title>Modeling the electrostatic field of a charged ring located inside an infinite cylinder in the presence of a torus</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шушкевич</surname><given-names>Г. Ч.</given-names></name><name name-style="western" xml:lang="en"><surname>Shushkevich</surname><given-names>G. Ch.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шушкевич Геннадий Чеславович - доктор физико-математических наук, профессор кафедры современных технологий программирования.</p><p>ул. Ожешко, 22, Гродно, 230023</p></bio><bio xml:lang="en"><p>Gennady Ch. Shushkevich - D. Sc. (Phys.-Math.), Prof, of Modern Programming Technologies Department, Yanka Kupala State University of Grodno.</p><p>Ozheshko st., 22, Grodno, 230023</p></bio><email xlink:type="simple">gsys@grsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>УО «Гродненский государственный университет им. Янки Купалы»</institution></aff><aff xml:lang="en"><institution>Yanka Kupala State University of Grodno</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>29</day><month>09</month><year>2023</year></pub-date><volume>20</volume><issue>3</issue><fpage>61</fpage><lpage>73</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Шушкевич Г.Ч., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Шушкевич Г.Ч.</copyright-holder><copyright-holder xml:lang="en">Shushkevich G.C.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://inf.grid.by/jour/article/view/1256">https://inf.grid.by/jour/article/view/1256</self-uri><abstract><sec><title>Цели</title><p>Цели. Аналитическое решение граничной задачи электростатики для моделирования электростатического поля заряженного кольца, расположенного внутри заземленного бесконечного кругового цилиндра в присутствии идеально проводящего тора. Источник поля - тонкое заряженное кольцо, расположенное на плоскости, перпендикулярной оси цилиндрического экрана.</p></sec><sec><title>Методы</title><p>Методы. Для решения поставленной задачи используется метод теорем сложения. Потенциал исходного электростатического поля представлен в виде сферических гармонических функций, затем с помощью теорем сложения, связывающих сферические, цилиндрические и тороидальные гармонические функции, - в виде суперпозиции цилиндрических и тороидальных гармонических функций. Вторичный потенциал электростатического поля также представлен в виде суперпозиции цилиндрических и тороидальных гармонических функций.</p></sec><sec><title>Результаты</title><p>Результаты. Решение поставленной граничной задачи сведено к решению бесконечной системы линейных алгебраических уравнений второго рода относительно коэффициентов, входящих в представление вторичного поля. Численно исследовано влияние некоторых параметров задачи на значение электростатического потенциала внутри заземленного цилиндрического экрана в присутствии тороидального включения. Результаты вычислений представлены в виде графиков.</p></sec><sec><title>Заключение</title><p>Заключение. Предложенная методика и разработанное программное обеспечение могут найти практическое применение при разработке и конструировании экранов в различных областях техники.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Objectives</title><p>Objectives. Analytical solution of the boundary value problem of electrostatics for modeling the electrostatic field of a charged ring located inside a grounded infinite circular cylinder in the presence of a perfectly conducting torus is considered. The field source is a thin charged ring located on a plane perpendicular to the axis of the cylindrical screen.</p></sec><sec><title>Methods</title><p>Methods. To solve the problem, the method of addition theorems is used. The potential of the initial electrostatic field is presented in the form of spherical harmonic functions and in the form of a superposition of cylindrical and toroidal harmonic functions, using addition theorems relating spherical, cylindrical and toroidal harmonic functions. The secondary potential of the electrostatic field is also represented as a superposition of cylindrical and toroidal harmonic functions.</p></sec><sec><title>Results</title><p>Results. The solution of the formulated boundary problem is reduced to the solution of an infinite system of linear algebraic equations of the second kind with respect to the coefficients included in the representation of the secondary field. The influence of some parameters of the problem on the value of the electrostatic potential inside a grounded cylindrical shield in the presence of a toroidal inclusion is numerically studied. The calculation results are presented in the form of graphs.</p></sec><sec><title>Conclusion</title><p>Conclusion. The proposed technique and the developed software can find practical application in the development and design of screens in various fields of technology.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>граничная задача</kwd><kwd>электростатическое поле</kwd><kwd>потенциал</kwd><kwd>теоремы сложения</kwd><kwd>гармонические функции</kwd></kwd-group><kwd-group xml:lang="en"><kwd>boundary value problem</kwd><kwd>electrostatic field</kwd><kwd>potential</kwd><kwd>addition theorems</kwd><kwd>harmonic functions</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнялась в рамках подпрограммы «Математические модели и методы» Государственной программы научных исследований «Конвергенция 2025».</funding-statement><funding-statement xml:lang="en">The work was carried out within the framework of the "Mathematical Models and Methods" of the State Program for Scientific Research "Convergence 2025".</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Дмитриев, В. 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