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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">npe</journal-id><journal-title-group><journal-title xml:lang="ru">Ядерная физика и инжиниринг</journal-title><trans-title-group xml:lang="en"><trans-title>Nuclear Physics and Engineering</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2079-5629</issn><issn pub-type="epub">2079-5637</issn><publisher><publisher-name>МИФИ</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.56304/S2079562926010197</article-id><article-id custom-type="edn" pub-id-type="custom">AONBNP</article-id><article-id custom-type="elpub" pub-id-type="custom">npe-621</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>Моделирование наноструктур</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Modeling of Nanostructures</subject></subj-group></article-categories><title-group><article-title>УСТОЙЧИВОСТЬ РЕШЕНИЙ ДЛЯ СМЕСИ ПОЛИДИСПЕРСНЫХ СФЕРИЧЕСКИХ И ЦИЛИНДРИЧЕСКИХ ЧАСТИЦ ПО ДАННЫМ МАЛОУГЛОВОГО РАССЕЯНИЯ</article-title><trans-title-group xml:lang="en"><trans-title>SOLUTION STABILITY FOR A MIXTURE OF POLYDISPERSE SPHERICAL AND CYLINDRICAL PARTICLES USING SMALL-ANGLE SCATTERING DATA</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>Крюкова</surname><given-names>А. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Kruykova</surname><given-names>A. E.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Конарев</surname><given-names>П. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Konarev</surname><given-names>P. V.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Волков</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Volkov</surname><given-names>V. V.</given-names></name></name-alternatives><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Отделение “Институт кристаллографии им. А.В. Шубникова” Курчатовского комплекса кристаллографии и фотоники НИЦ “Курчатовский институт”</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Shubnikov Institute of Crystallography of the Kurchatov Complex of Crystallography and Photonics, National Research Centre “Kurchatov Institute”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>16</day><month>04</month><year>2026</year></pub-date><volume>17</volume><issue>1</issue><fpage>165</fpage><lpage>170</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Крюкова А.Е., Конарев П.В., Волков В.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Крюкова А.Е., Конарев П.В., Волков В.В.</copyright-holder><copyright-holder xml:lang="en">Kruykova A.E., Konarev P.V., Volkov V.V.</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://npe.elpub.ru/jour/article/view/621">https://npe.elpub.ru/jour/article/view/621</self-uri><abstract><p>Проведен анализ устойчивости определения размерных распределений частиц по модельным данным интенсивности малоуглового рассеяния от смесей полидисперсных сферических и цилиндрических частиц. Показано, что при использовании параметрической модели распределения вероятность получения правильного решения методом нелинейных наименьших квадратов уменьшается при расширении диапазона стартовых значений параметров, а разброс решений, соответствующих побочным минимумам целевой функции, возрастает. Неоднозначность решений возникает в большинстве случаев при завышенных оценках средних размеров цилиндрических частиц и их полидисперсности по сравнению с точным решением. Для избегания попаданий минимизируемой целевой функции в локальные минимумы требуется хорошее стартовое приближение, в пределах 50% относительной отстройки параметров модели от их точных значений.</p></abstract><trans-abstract xml:lang="en"><p>The stability of the determination of particle size distributions using model small-angle scattering intensity from mixtures of polydisperse spherical and cylindrical particles has been analyzed. It is shown that when using a parametric distribution model, the probability of obtaining the correct nonlinear least squares solution decreases when the range of starting parameter values is expanded, and the scatter of solutions corresponding to local minima of the target function increases. Ambiguity of solutions occurs in most cases with overestimations of the average size of cylindrical particles and their polydispersity compared to the exact solution. To avoid the minimization target function falling into local minima, a good starting approximation is required, within 50% of the relative detuning of the model parameters from their exact values.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>малоугловое рассеяние</kwd><kwd>сферические и цилиндрические частицы</kwd><kwd>распределение частиц по размерам</kwd><kwd>полидисперсные системы</kwd><kwd>устойчивость решений</kwd></kwd-group><kwd-group xml:lang="en"><kwd>small-angle scattering</kwd><kwd>spherical and cylindrical particles</kwd><kwd>particle size distribution</kwd><kwd>polydisperse systems</kwd><kwd>solution stability</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа проведена в рамках выполнения государственного задания НИЦ “Курчатовский институт”.</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">Volkov V.V., Konarev P.V., Kryukova A.E. // JETP Lett. 2020. 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