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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">najo</journal-id><journal-title-group><journal-title xml:lang="en">Nanosystems: Physics, Chemistry, Mathematics</journal-title><trans-title-group xml:lang="ru"><trans-title>Наносистемы: физика, химия, математика</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2220-8054</issn><issn pub-type="epub">2305-7971</issn><publisher><publisher-name>Университет ИТМО</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">najo-1123</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>MATHEMATICS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕМАТИКА</subject></subj-group></article-categories><title-group><article-title>Direct and inverse problems in the model of quantum graphs</article-title><trans-title-group xml:lang="ru"><trans-title>Прямые и обратные задачи в модели квантовых графов</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>Лобанов</surname><given-names>И. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Lobanov</surname><given-names>I. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Saint-Petersburg</p></bio><email xlink:type="simple">lobanov.igor@gmail.com</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>Трифанова</surname><given-names>Е. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Trifanova</surname><given-names>E. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Saint-Petersburg</p></bio><email xlink:type="simple">etrifanova@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики</institution></aff><aff xml:lang="en"><institution>St. Petersburg National Research University of Information&#13;
Technologies, Mechanics, and Optics</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2012</year></pub-date><pub-date pub-type="epub"><day>19</day><month>08</month><year>2025</year></pub-date><volume>3</volume><issue>5</issue><fpage>6</fpage><lpage>32</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Lobanov I.S., Trifanova E.S., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Лобанов И.С., Трифанова Е.С.</copyright-holder><copyright-holder xml:lang="en">Lobanov I.S., Trifanova E.S.</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://nanojournal.ifmo.ru/jour/article/view/1123">https://nanojournal.ifmo.ru/jour/article/view/1123</self-uri><abstract><p>   Here we present a detailed statement about solving of spectral and transport problems for quantum graphs. The practical prescriptions for finding the energy of pi-electrons and current-voltage characteristics for aromatic at the disposal of models of quantum graphs are suggested. We propose an algorithm increasing the precision of numerical solution and discuss the facilities for parallel computations. Here we also suggest the method of inverse problem solution which plays an important role in engineering.</p></abstract><trans-abstract xml:lang="ru"><p>   В статье дается подробнее изложение методов решения спектральной и транспортной задачи для квантовых графов. Даются практические рецепты нахождения энергии π-электронов и вольт-амперных характеристик для ароматических соединений в рамках модели квантовых графов. Предлагаются приемы, увеличивающие точность численного решения перечисленных задач, а также описываются возможности для распараллеливания вычислений. Также в статье предлагается основанный на генетических алгоритмах способ решения обратных задач, важных для наноинженерии.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>квантовые графы</kwd><kwd>электронные свойства</kwd><kwd>модели ароматических соединений</kwd><kwd>алгоритмы суперкомпьютерного моделирования</kwd></kwd-group><kwd-group xml:lang="en"><kwd>quantum graphs</kwd><kwd>electronic properties</kwd><kwd>models of aromatic</kwd><kwd>algorithms of supercomputer modeling</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа по разделам 1, 5, 8, 10 выполнена в рамках государственного контракта № 07.514.11.4146 в рамках федеральной целевой программы «Исследования и разработки по приоритетным направлениям развития научно-технологического комплекса России на 2007–2013 годы» научно-исследовательские работы по лоту шифр «2012-1.4-07-514- 0017» «Суперкомпьютерное моделирование процессов создания материалов с заданными оптоэлектронными свойствами для инновационных технологий» по теме: «Высокопроизводительный программный комплекс для моделирования электронных и электромеханических свойств наноуглеродных объектов» (шифр заявки «2012-1.4-07-514-0017-023»). Работа по разделам 2, 3, 4, 6, 7, 9 выполнена в рамках соглашения №14.B37.21.0371 о выполнением научно-исследовательской работы по теме «Спектральный анализ на гибридных многообразиях» (номер заявки в информационной компьютеризированной системе «2012-1.2.2-12-000-1001-047») в рамках реализации федеральной целевой программы «Научные и научно-педагогические кадры инновационной России» на 2009-–2013 годы (приложение № 2.2 к федеральной целевой программе «Научные и научно-педагогические кадры инновационной России» на 2009 – 2013 годы, утвержденной постановлением Правительства Российской Федерации от 28 июля 2008 года № 568)</funding-statement><funding-statement xml:lang="en">Sections 1, 5, 8, and 10 were completed under a government contract No. 07.514.11.4146 as part of the Federal Target Program "Research and Development in Priority Areas of Russia's Scientific and Technological Complex Development for 2007-2013" Research and development work on the lot code "2012-1.4-07-514- 0017" "Supercomputer Modeling of Processes for Creating Materials with Specified Optoelectronic Properties for Innovative Technologies" on the topic: "High-performance software package for modeling the electronic and electromechanical properties of nanocarbon objects" (application code "2012-1.4-07-514-0017-023"). Sections 2, 3, 4, 6, 7, and 9 were completed under agreement No. 14.B37.21.0371 on the implementation of research work on the topic "Spectral analysis on hybrid manifolds" (application number in the information computerized system "2012-1.2.2-12-000-1001-047") within the framework of the federal target program "Scientific and scientific-pedagogical</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">Alexander S. Superconductivity of networks. A percolation approach to the effects of disorder // Phys. Rev. B. — 1983. — 27. — P. 1541–1557.</mixed-citation><mixed-citation xml:lang="en">Alexander S. Superconductivity of networks. A percolation approach to the effects of disorder // Phys. Rev. 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