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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">mais</journal-id><journal-title-group><journal-title xml:lang="ru">Моделирование и анализ информационных систем</journal-title><trans-title-group xml:lang="en"><trans-title>Modeling and Analysis of Information Systems</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1818-1015</issn><issn pub-type="epub">2313-5417</issn><publisher><publisher-name>Yaroslavl State University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18255/1818-1015-2014-1-45-52</article-id><article-id custom-type="elpub" pub-id-type="custom">mais-126</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>Оригинальные статьи</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Articles</subject></subj-group></article-categories><title-group><article-title>Классические и неклассические симметрии нелинейного дифференциального уравнения для описания волн в жидкости с пузырьками газа</article-title><trans-title-group xml:lang="en"><trans-title>Classical and Nonclassical Symmetries of Nonlinear Differential Equation for Describing Waves in a Liquid with Gas Bubbles</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>Кудряшов</surname><given-names>Николай Алексеевич</given-names></name><name name-style="western" xml:lang="en"><surname>Kudryashov</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>доктор физ.-мат. наук, профессор, зав. кафедрой,</p><p>115409 Россия, г. Москва, Каширское шоссе, 31</p></bio><bio xml:lang="en"><p>доктор физ.-мат. наук, профессор, зав. кафедрой,</p><p>Kashirskoe shosse, 31, Moscow, 115409, Russia</p></bio><email xlink:type="simple">nakudryashov@mephi.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>Синельщиков</surname><given-names>Дмитрий Игоревич</given-names></name><name name-style="western" xml:lang="en"><surname>Sinelshchikov</surname><given-names>D. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физ.-мат. наук, ст. преподаватель,</p><p>115409 Россия, г. Москва, Каширское шоссе, 31</p></bio><bio xml:lang="en"><p>кандидат физ.-мат. наук, ст. преподаватель,</p><p>Kashirskoe shosse, 31, Moscow, 115409, Russia</p></bio><email xlink:type="simple">disinelshchikov@mephi.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский ядерный университет МИФИ</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Research Nuclear University MEPhI</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2014</year></pub-date><pub-date pub-type="epub"><day>20</day><month>02</month><year>2014</year></pub-date><volume>21</volume><issue>1</issue><fpage>45</fpage><lpage>52</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Кудряшов Н.А., Синельщиков Д.И., 2014</copyright-statement><copyright-year>2014</copyright-year><copyright-holder xml:lang="ru">Кудряшов Н.А., Синельщиков Д.И.</copyright-holder><copyright-holder xml:lang="en">Kudryashov N.A., Sinelshchikov D.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.mais-journal.ru/jour/article/view/126">https://www.mais-journal.ru/jour/article/view/126</self-uri><abstract><p>Рассматривается нелинейное дифференциальное уравнение для описания нелинейных волн в жидкости с пузырьками газа при учете вязкости жидкости и процесса межфазного теплообмена. Исследованы классические и неклассические симметрии данного уравнения в частных производных. Показано, что исследуемое уравнение инвариантно относительно преобразований сдвига по пространственной и временной координатам. При дополнительном ограничении на параметры, уравнение также инвариантно относительно преобразования Галилея. Неклассические симметрии рассматриваемого уравнения находятся методом Блюмана и Коула. Изучены регулярный и сингулярный случаи неклассических симметрий. Найдены пять семейств неклассических симметрий, допускаемых исследуемым уравнением. Построены инвариантные редукции, соответствующие данным симметриям. С их помощью найдены семейства точных решений исследуемого уравнения. Полученные решения выражаются через рациональные, тригонометрические и специальные функции.</p></abstract><trans-abstract xml:lang="en"><p>A nonlinear differential equation is considered for describing nonlinear waves in a liquid with gas bubbles. Classical and nonclassical symmetries of this equation are investigated. It is shown that the considered equation admits transformations in space and time. At a certain condition on parameters, this equation also admits a group of Galilean transformations. The method by Bluman and Cole is used for finding nonclassical symmetries admitted by the studied equation. Both regular and singular cases of nonclassical symmetries are considered. Five families of nonclassical symmetries admitted by this equation are constructed. Symmetry reductions corresponding to these families of generators are obtained. Exact solutions of these symmetry reductions are constructed. These solutions are expressed via rational, exponential, trigonometric and special functions.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>нелинейные волны в жидкости с пузырьками газа</kwd><kwd>классические симметрии</kwd><kwd>неклассические симметрии</kwd><kwd>точные решения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>nonlinear waves in a liquid with gas bubbles</kwd><kwd>classical symmetries</kwd><kwd>nonclassical symmetries</kwd><kwd>exact solutions</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">грант для поддержки ведущих научных школ РФ, грант для поддержки молодых ученых–кандидатов наук</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">Nigmatulin R.I. Dynamics of Multiphase Media, Part 2. New York: Taylor &amp; Francis, 1990. P. 388.</mixed-citation><mixed-citation xml:lang="en">Nigmatulin R.I. 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