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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">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-2430-2023-59-4-291-301</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-743</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>МАТЕМАТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>Математическое моделирование эпидемических процессов в случае контактной поэтапной схемы инфицирования</article-title><trans-title-group xml:lang="en"><trans-title>Mathematical modelling of epidemic processes in the case of the contact stepwise infection pattern</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>Чигарев</surname><given-names>А. B.</given-names></name><name name-style="western" xml:lang="en"><surname>Chigarev</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чигарев Анатолий Власович – доктор физико-математических наук, профессор, кафедра био- и наномеханики</p><p>пр. Независимости, 4, 220030, Минск</p></bio><bio xml:lang="en"><p>Anatoly V. Chigarev – Dr. Sc. (Physics and Mathematics), Professor, Department of Bio- and nanomechanics</p><p>4, Nezalezhnosti Ave., 220030, Minsk, Republic of Belarus</p><p> </p></bio><email xlink:type="simple">chigarevanatoli@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Журавков</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhuravkov</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Журавков Михаил Анатольевич – доктор физико-математических наук, профессор, кафедра теоретической и прикладной механики</p><p>пр. Независимости, 4, 220030, Минск</p></bio><bio xml:lang="en"><p>Mikhail A. Zhuravskov – Dr. Sc. (Physics and Mathematics), Professor, Department of Theoretical and Applied Mechanics</p><p>4, Nezalezhnosti Ave., 220030, Minsk, Republic of Belarus</p></bio><email xlink:type="simple">Zhuravkov@bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Михнович</surname><given-names>М. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Mikhnovich</surname><given-names>M. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Михнович Майя Олеговна –  ассистент кафедры интеллектуальные и мехатронные системы</p><p>пр. Независимости, 65, 220013, Минск</p><p> </p><p> </p></bio><bio xml:lang="en"><p>Maya O. Mikhnovich – Assistant of the Department of Intellectual and Mechatronic Systems </p><p>65, Nezalezhnosti Ave., 220013, Minsk, Republic of Belarus</p></bio><email xlink:type="simple">mayjka@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Белорусский национальный технический университет</institution></aff><aff xml:lang="en"><institution>Belarusian National Technical University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>05</day><month>01</month><year>2024</year></pub-date><volume>59</volume><issue>4</issue><fpage>291</fpage><lpage>301</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Чигарев А.B., Журавков М.А., Михнович М.О., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Чигарев А.B., Журавков М.А., Михнович М.О.</copyright-holder><copyright-holder xml:lang="en">Chigarev A.V., Zhuravkov M.A., Mikhnovich M.O.</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://vestifm.belnauka.by/jour/article/view/743">https://vestifm.belnauka.by/jour/article/view/743</self-uri><abstract><p>Рассматриваются математические модели инфицирования контингента, состоящего из двух типов людей: которые передают инфекцию другим людям (1-й тип) и которые в распространении инфекции не участвуют (2-й тип). На основе теории перколяции и модели типа урновых испытаний определяется критическое значение доли инфицированых в популяции, после которого процесс инфицирования может приобрести взрывной характер. Изучаются вероятности непрерывного инфицирования и прерывания передачи инфекции. На основе логистического отображения Фейгенбаума применительно к эпидемическому процессу удается оценить изменение значения параметра числа контактов и возникающие при этом бифуркации, которые моделируются в соответствии со сценарием перехода к детерминированному хаосу через удвоение периода цикла. В режимах стохастичности существуют локальные режимы периодичности, выявление которых в случае адекватности модели реальной ситуации позволяет предсказывать и управлять эпидемическим процессом, переводя его или удерживая в устойчивом циклическом состоянии.</p></abstract><trans-abstract xml:lang="en"><p>Herein we consider mathematical models of infection in a population consisting of two types of people: those who transmit infection to others (type 1) and those who do not participate in the spread of infection (type 2). On the basis of the percolation theory and a model of the urn test type, a critical value of the proportion of infected persons in the population is determined, after which the infection process may become explosive. The probabilities of continuous infection and the interruption of its transmission are investigated. On the basis of Feigenbaum logistic mapping for the epidemic process, it is possible to estimate the change in the value of the parameter of the number of contacts and the bifurcations arising in this case, which are modelled in accordance with the scenario of transition to deterministic chaos through the doubling of the cycle period. In modes of stochasticity there are local modes of periodicity, the identification of which, if the model is adequate to the real situation, allows predicting and controlling the epidemic process, translating it or keeping the process in a stable cyclic state.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>эпидемия</kwd><kwd>инфицирование</kwd><kwd>урновая модель</kwd><kwd>перколяция</kwd><kwd>устойчивость</kwd><kwd>стационарный режим</kwd><kwd>стохастизация</kwd></kwd-group><kwd-group xml:lang="en"><kwd>еpidemic</kwd><kwd>infection</kwd><kwd>urn model</kwd><kwd>percolation</kwd><kwd>stability</kwd><kwd>stationary regime</kwd><kwd>stochasticisation</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Чигарев, А. В. Детерминированные и стохастические модели распространения инфекции и тестирование в изолированном контингенте / А. В. Чигарев, М. А. Журавков, В. А. 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