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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">mrisel</journal-id><journal-title-group><journal-title xml:lang="en">Magnetic Resonance in Solids</journal-title><trans-title-group xml:lang="ru"><trans-title>Magnetic Resonance in Solids</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2072-5981</issn><publisher><publisher-name>Kazan Federal University</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">mrisel-111</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Concentration of paramagnetic centres at low-temperature thermal destruction of asphaltenes of heavy petroleum distillates</article-title><trans-title-group xml:lang="ru"><trans-title></trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Dolomatov</surname><given-names>M. U.</given-names></name></name-alternatives><bio xml:lang="en"><p>Validy 32, Ufa 450076; Kosmonavtov 1, Ufa 450000</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Rodionov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kremlevskaya 18, Kazan 420008</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Gafurov</surname><given-names>M. R.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kremlevskaya 18, Kazan 420008</p></bio><email xlink:type="simple">Marat.Gafurov@kpfu.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Petrov</surname><given-names>A. V.</given-names></name></name-alternatives></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Biktagirov</surname><given-names>T. B.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kremlevskaya 18, Kazan 420008</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Bakhtizin</surname><given-names>R. Z.</given-names></name></name-alternatives><bio xml:lang="en"><p>Validy 32, Ufa 450076</p></bio><xref ref-type="aff" rid="aff-4"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Makarchikov</surname><given-names>S. O.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kremlevskaya 18, Kazan 420008</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Khairudinov</surname><given-names>I. Z.</given-names></name></name-alternatives><bio xml:lang="en"><p>Iniciativnaya 12, Ufa 450065</p></bio><xref ref-type="aff" rid="aff-5"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Orlinskii</surname><given-names>S. B.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kremlevskaya 18, Kazan 420008</p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Bashkir State University; Ufa State Petroleum Technological University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>Kazan Federal University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-3"><institution>Bashkir State University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-4"><institution>Institute of Petroleum Refining and Petrochemistry</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2016</year></pub-date><pub-date pub-type="epub"><day>08</day><month>11</month><year>2016</year></pub-date><volume>18</volume><issue>1</issue><elocation-id>16101 (7 pp.)</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Dolomatov M.U., Rodionov A.A., Gafurov M.R., Petrov A.V., Biktagirov T.B., Bakhtizin R.Z., Makarchikov S.O., Khairudinov I.Z., Orlinskii S.B., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Dolomatov M.U., Rodionov A.A., Gafurov M.R., Petrov A.V., Biktagirov T.B., Bakhtizin R.Z., Makarchikov S.O., Khairudinov I.Z., Orlinskii S.B.</copyright-holder><copyright-holder xml:lang="en">Dolomatov M.U., Rodionov A.A., Gafurov M.R., Petrov A.V., Biktagirov T.B., Bakhtizin R.Z., Makarchikov S.O., Khairudinov I.Z., Orlinskii S.B.</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://www.mrsej.ru/jour/article/view/111">https://www.mrsej.ru/jour/article/view/111</self-uri><abstract><p>Changes of paramagnetic centers (PC) concentration in dispersed petroleum systems were studied in the process of low-temperature thermolysis. The kinetic model of PC concentration dynamics based on the processes of unpaired electrons formation during singlet-triplet transitions, weak chemical bonds dissociation and recombination of free radicals is proposed.</p></abstract><kwd-group xml:lang="en"><kwd>petroleum disperse system</kwd><kwd>asphalt</kwd><kwd>asphaltene</kwd><kwd>paramagnetic centers</kwd><kwd>temperature dependence</kwd><kwd>EPR</kwd><kwd>ESR</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The work was funded by the subsidy of the Russian Government to support the Program of competitive Growth of Kazan Federal University among World’s Leading Academic Centers and by the Project Part of the state support of Ministry of Education of Russian Federation.</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">Syunyaev Z.I. Chem. Technol. 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