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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Contemporary Mathematics. Fundamental Directions</journal-id><journal-title-group><journal-title xml:lang="en">Contemporary Mathematics. Fundamental Directions</journal-title><trans-title-group xml:lang="ru"><trans-title>Современная математика. Фундаментальные направления</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2413-3639</issn><issn publication-format="electronic">2949-0618</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">22266</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2018-64-1-148-163</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>New Results</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Новые результаты</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Boundedness and Finite-Time Stability for Multivalued Doubly-Nonlinear Evolution Systems Generated by a Microwave Heating Problem</article-title><trans-title-group xml:lang="ru"><trans-title>Ограниченность и устойчивость на конечных интервалах для многозначных дважды нелинейных эволюционных систем, порожденных задачей микроволнового нагрева</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Popov</surname><given-names>S</given-names></name><name xml:lang="ru"><surname>Попов</surname><given-names>С</given-names></name></name-alternatives><email>psa.87@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Reitmann</surname><given-names>V</given-names></name><name xml:lang="ru"><surname>Райтманн</surname><given-names>Ф</given-names></name></name-alternatives><email>vreitmann@aol.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Skopinov</surname><given-names>S</given-names></name><name xml:lang="ru"><surname>Скопинов</surname><given-names>С</given-names></name></name-alternatives><email>serg_vologda@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">St. Petersburg State University</institution></aff><aff><institution xml:lang="ru">Санкт-Петербургский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2018-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2018</year></pub-date><volume>64</volume><issue>1</issue><issue-title xml:lang="en">Diﬀerential and Functional Diﬀerential Equations</issue-title><issue-title xml:lang="ru">Дифференциальные и функционально-дифференциальные уравнения</issue-title><fpage>148</fpage><lpage>163</lpage><history><date date-type="received" iso-8601-date="2019-11-29"><day>29</day><month>11</month><year>2019</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2019, Contemporary Mathematics. Fundamental Directions</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2019, Современная математика. Фундаментальные направления</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="en">Contemporary Mathematics. Fundamental Directions</copyright-holder><copyright-holder xml:lang="ru">Современная математика. Фундаментальные направления</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/22266">https://journals.rudn.ru/CMFD/article/view/22266</self-uri><abstract xml:lang="en">Doubly-nonlinear evolutionary systems are considered. Suﬃcient conditions of the boundedness of solutions of such systems are derived. Analogical results for a one-dimensional microwave heating problem are proved. The notions of global process and of a local multivalued process are introduced. Suﬃcient conditions for the ﬁnite-time stability of a global process and of a local multivalued process are shown. For local multivalued processes suﬃcient conditions for the ﬁnite-time instability are derived. For the one-dimensional microwave heating problem conditions of the ﬁnite-time stability are shown.</abstract><trans-abstract xml:lang="ru">Рассматриваются дважды нелинейные эволюционные системы. Получены достаточные условия ограниченности их решений. Аналогичные результаты получены для одномерной задачи микроволнового нагрева. Вводятся понятия глобального процесса и локального многозначного процесса. Для глобального процесса и локального многозначного процесса представлены достаточные условия устойчивости на конечном интервале времени. Для локальных многозначных процессов найдены достаточные условия неустойчивости на конечном интервале времени. Для одномерной задачи микроволнового нагрева представлены условия устойчивости на конечном интервале времени.</trans-abstract></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Березанский Ю. М. Разложение по собственным функциям самосопряженных операторов. - Киев: Наукова думка, 1965.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Ермаков И. В., Калинин Ю. Н., Райтманн В. Определяющие моды и почти периодические интегралы для коциклов// Дифф. уравн. - 2011. - 47, № 13. - С. 1-16.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Лихтарников А. Л. Критерии абсолютной устойчивости нелинейных операторных уравнений// Изв. АН СССР. Сер. Мат. - 1977. - 41, № 5. - C. 1064-1083.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Лихтарников А. Л., Якубович В. 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