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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">fisheriesjournal</journal-id><journal-title-group><journal-title xml:lang="ru">Рыбное хозяйство</journal-title><trans-title-group xml:lang="en"><trans-title>Fisheries</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0131-6184</issn><publisher><publisher-name>ГНЦ РФ ФГБНУ «ВНИРО»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.37663/0131-6184-2022-1-75-81</article-id><article-id custom-type="elpub" pub-id-type="custom">fisheriesjournal-69</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>ТЕХНИКА РЫБОЛОВСТВА И ФЛОТ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>FISHING EQUIPMENT AND FLEET</subject></subj-group></article-categories><title-group><article-title>Нелинейная физика в практике флота – рекуперация энергии при остановке</article-title><trans-title-group xml:lang="en"><trans-title>Nonlinear physics in Fleet practice – energy recovery at standstill</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>Гайденок</surname><given-names>Н. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Gaidenok</surname><given-names>N. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Д-р техн. наук, профессор.</p><p>Красноярск</p></bio><bio xml:lang="en"><p>Doctor of Technical Sciences, Professor.</p><p>Krasnoyarsk</p></bio><email xlink:type="simple">ndgay@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Сибирский федеральный университет<country>Россия</country></aff><aff xml:lang="en">Siberian Federal University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>28</day><month>02</month><year>2022</year></pub-date><volume>0</volume><issue>1</issue><fpage>75</fpage><lpage>81</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Гайденок Н.Д., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Гайденок Н.Д.</copyright-holder><copyright-holder xml:lang="en">Gaidenok N.D.</copyright-holder><license 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://fisheriesjournal.elpub.ru/jour/article/view/69">https://fisheriesjournal.elpub.ru/jour/article/view/69</self-uri><abstract><p>В работе рассмотрены два нелинейных явления, исследуемых в рамках теории катастроф, которые присутствуют в практике флота и относятся к различным сторонам логистики – рекуперация энергии, как «солитонная» тяга тела, и формальный образ актуального для настоящего времени влияния на все стороны функционирования флота пандемии Ковид – 19. Показано их соответствие катастрофам складки.</p></abstract><trans-abstract xml:lang="en"><p>The paper considers two nonlinear phenomena studied in the framework of the theory of catastrophes, which are present in the practice of the fleet and relate to various aspects of logistics - energy recovery due to the "soliton" thrust of the body and the formal image of the current impact of the covid-19 coronavirus pandemic. Their correspondence to the catastrophes of folding and assembly is shown.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>неустойчивость</kwd><kwd>кошель</kwd><kwd>рекуперация энергии</kwd><kwd>нелинейные явления</kwd><kwd>катастрофа складки</kwd><kwd>лагранжеан</kwd><kwd>гамильтониан</kwd><kwd>бегущая волна</kwd><kwd>солитон</kwd><kwd>цунами</kwd><kwd>лагранжевая динамика пандемии коронавируса – 19</kwd><kwd>модель типа бегущей волны пандемии коронавируса – 19</kwd></kwd-group><kwd-group xml:lang="en"><kwd>instability</kwd><kwd>energy recovery</kwd><kwd>nonlinear phenomena</kwd><kwd>fold catastrophe</kwd><kwd>lagrangean</kwd><kwd>hamiltonian</kwd><kwd>running wave</kwd><kwd>soli-ton</kwd><kwd>tsunami</kwd><kwd>lagrangian dynamics of the covid-19 coronavirus pandemic</kwd><kwd>a running wave model of the covid-19 coronavirus pandemic</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">Гайденок Н.Д. 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