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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">chemicallytech</journal-id><journal-title-group><journal-title xml:lang="en">Fine Chemical Technologies</journal-title><trans-title-group xml:lang="ru"><trans-title>Тонкие химические технологии</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2410-6593</issn><issn pub-type="epub">2686-7575</issn><publisher><publisher-name>MIREA – Russian Technological University (RTU MIREA).</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.32362/2410-6593-2025-20-6-531-539</article-id><article-id custom-type="edn" pub-id-type="custom">AQQLQV</article-id><article-id custom-type="elpub" pub-id-type="custom">chemicallytech-2332</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="en"><subject>THEORETICAL BASIS OF CHEMICAL TECHNOLOGY</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ТЕОРЕТИЧЕСКИЕ ОСНОВЫ ХИМИЧЕСКОЙ ТЕХНОЛОГИИ</subject></subj-group></article-categories><title-group><article-title>Solution of the inverse problem  for chemical reactions with chaotic dynamics</article-title><trans-title-group xml:lang="ru"><trans-title>Решение обратной задачи для химических реакций с хаотической динамикой</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1971-0806</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Алексеев</surname><given-names>Б. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Alekseev</surname><given-names>B. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алексеев Борис Васильевич, к.ф.-м.н., доцент кафедры физической химии и высокомолекулярных соединений</p><p>Scopus Author ID 7005563886, ResearcherID GNO-9997-2022</p><p>428015, г. Чебоксары, Московский пр-т, д. 15</p></bio><bio xml:lang="en"><p>Boris V. Alekseev, Cand. Sci. (Phys.-Math.), Associate Professor, Department of Physical Chemistry and Macromolecular Compounds</p><p>Scopus Author ID 7005563886, ResearcherID GNO-9997-2022</p><p>15, Moskovskii pr., Cheboksary, 428015</p></bio><email xlink:type="simple">a402539@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8395-6849</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Федотов</surname><given-names>В. Х.</given-names></name><name name-style="western" xml:lang="en"><surname>Fedotov</surname><given-names>V. Kh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Федотов Владислав Харитонович, к.х.н., доцент кафедры физической химии и высокомолекулярных соединений</p><p>Scopus Author ID 8863837600, ResearcherID B-6529-2017</p><p>428015, г. Чебоксары, Московский пр-т, д. 15</p></bio><bio xml:lang="en"><p>Vladislav Kh. Fedotov, Cand. Sci. (Chem.), Associate Professor, Department of Physical Chemistry and Macromolecular Compounds</p><p>Scopus Author ID 8863837600, ResearcherID B-6529-2017</p><p>15, Moskovskii pr., Cheboksary, 428015</p></bio><email xlink:type="simple">fvh@inbox.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2264-1370</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кольцов</surname><given-names>Н. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Kol’tsov</surname><given-names>N. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кольцов Николай Иванович, д.х.н., профессор, заведующий кафедрой физической химии и высокомолекулярных соединений</p><p>Scopus Author ID 7003771176, ResearcherID O-1354-2017</p><p>428015, г. Чебоксары, Московский пр-т, д. 15</p></bio><bio xml:lang="en"><p>Nikolay I. Kol’tsov, Dr. Sci. (Chem.), Professor, Head of the Department of Physical Chemistry and Macromolecular Compounds</p><p>Scopus Author ID 7003771176, ResearcherID O-1354-2017</p><p>15, Moskovskii pr., Cheboksary, 428015</p></bio><email xlink:type="simple">koltsovni@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Чувашский государственный университет им. И.Н. Ульянова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>I.N. Ulyanov Chuvash State University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>14</day><month>01</month><year>2026</year></pub-date><volume>20</volume><issue>6</issue><fpage>531</fpage><lpage>539</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Alekseev B.V., Fedotov V.K., Kol’tsov N.I., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Алексеев Б.В., Федотов В.Х., Кольцов Н.И.</copyright-holder><copyright-holder xml:lang="en">Alekseev B.V., Fedotov V.K., Kol’tsov N.I.</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://www.finechem-mirea.ru/jour/article/view/2332">https://www.finechem-mirea.ru/jour/article/view/2332</self-uri><abstract><sec><title>Objectives</title><p>Objectives. To develop and test a method for solving the inverse problem of chemical kinetics for estimating the frequencies of elementary stages of complex chemical reactions occurring in a chaotic regime.</p></sec><sec><title>Methods</title><p>Methods. The method is based on the representation of nonstationary experimental data on reagent concentrations and the rates of their change in the form of a matrix of a particular structure.</p></sec><sec><title>Results</title><p>Results. The effectiveness of the method is demonstrated by examples of reactions proceeding according to stage schemes similar to the Willamowski–Rossler mechanism, characterized by undamped aperiodic oscillations.</p></sec><sec><title>Conclusions</title><p>Conclusions. The method allows the frequencies of stages for reactions proceeding according to mechanisms with non-monotonic dynamics of any complexity to be determined with high accuracy.</p></sec></abstract><trans-abstract xml:lang="ru"><sec><title>Цели</title><p>Цели. Разработка и апробация метода решения обратной задачи химической кинетики по оценке частот элементарных стадий сложных химических реакций, протекающих в хаотическом режиме.</p></sec><sec><title>Методы</title><p>Методы. Метод основан на представлении нестационарных экспериментальных данных о концентрациях реагентов и скоростях их изменения в виде матрицы специальной структуры.</p></sec><sec><title>Результаты</title><p>Результаты. Эффективность метода показана на примерах реакций, протекающих по стадийным схемам, аналогичным механизму Вилламовски–Росслера, и характеризующихся незатухающими апериодическими колебаниями.</p></sec><sec><title>Выводы</title><p>Выводы. Метод позволяет с высокой точностью определить частоты стадий для реакций, протекающих по механизмам с немонотонной динамикой любой сложности.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>обратная задача химической кинетики</kwd><kwd>хаотическая динамика</kwd><kwd>нестационарные экспериментальные данные</kwd><kwd>концентрации реагентов и скорости их изменения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>inverse problem of chemical kinetics</kwd><kwd>chaotic dynamics</kwd><kwd>nonstationary experimental data</kwd><kwd>reagent concentrations and rates of their change</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">Исмагилова А.С., Спивак С.И. Обратные задачи химической кинетики. Saarbrucken: Lap Lambert Academic Publ.; 2013, 125 с. ISBN 978-36593118474. https://www.elibrary.ru/glykiv</mixed-citation><mixed-citation xml:lang="en">Ismagilova A.S., Spivak S.I. 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