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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 pub-id-type="doi">10.17586/2220-8054-2021-12-2-151-155</article-id><article-id custom-type="elpub" pub-id-type="custom">najo-352</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>On the choice of parameters for a model of small window</article-title><trans-title-group xml:lang="ru"><trans-title>О выборе параметров модели малого окна</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>Melikhova</surname><given-names>A. S.</given-names></name><name name-style="western" xml:lang="en"><surname>Melikhova</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Kroverkskiy pr. 49, St. Petersburg, 197101</p></bio><bio xml:lang="en"><p>Kroverkskiy pr. 49, St. Petersburg, 197101</p></bio><email xlink:type="simple">alina.s.melikhova@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>Faleeva</surname><given-names>M. P.</given-names></name><name name-style="western" xml:lang="en"><surname>Faleeva</surname><given-names>M. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Kroverkskiy pr. 49, St. Petersburg, 197101</p></bio><bio xml:lang="en"><p>Kroverkskiy pr. 49, St. Petersburg, 197101</p></bio><email xlink:type="simple">faleeva.masha@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>Popov</surname><given-names>I. Y.</given-names></name><name name-style="western" xml:lang="en"><surname>Popov</surname><given-names>I. Y.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Kroverkskiy pr. 49, St. Petersburg, 197101</p></bio><bio xml:lang="en"><p>Kroverkskiy pr. 49, St. Petersburg, 197101</p></bio><email xlink:type="simple">popov1955@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ITMO University</institution></aff><aff xml:lang="en"><institution>ITMO University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>28</day><month>07</month><year>2025</year></pub-date><volume>12</volume><issue>2</issue><fpage>151</fpage><lpage>155</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Melikhova A.S., Faleeva M.P., Popov I.Y., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Melikhova A.S., Faleeva M.P., Popov I.Y.</copyright-holder><copyright-holder xml:lang="en">Melikhova A.S., Faleeva M.P., Popov I.Y.</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/352">https://nanojournal.ifmo.ru/jour/article/view/352</self-uri><abstract><p>Scattering of plane waves and Gaussian beams by a screen with small opening is considered. The asymptotics far from the obstacle is obtained.</p><p>The results can be useful for description of perforated nanolayers and for fitting the model based on the operator extensions theory.</p></abstract><trans-abstract xml:lang="ru"><p>Рассмотрено рассеяние плоских волн и гауссовых пучков экраном с малым отверстием. Получены асимптотики вдали от препятствия.</p><p>Результаты могут быть полезны для описания перфорированных нанослоев и для выбора параметров модели, основанной на теории расширений операторов.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>рассеяние</kwd><kwd>функция Грина</kwd><kwd>асимптотика</kwd></kwd-group><kwd-group xml:lang="en"><kwd>scattering</kwd><kwd>Green’s function</kwd><kwd>asymptotics</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">Morse F.M., Feshbach G. Methods of theoretical physics, V. 2. 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