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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 pub-id-type="doi">10.26907/mrsej-25300</article-id><article-id custom-type="elpub" pub-id-type="custom">mrisel-286</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>In memory of Professor Boris I. Kochelaev (04/19/1934 – 09/29/2025)</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>Aganov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Aliyev</surname><given-names>M. N.</given-names></name></name-alternatives><bio xml:lang="en"><p>Baku </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>Aminova</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Aminov</surname><given-names>L. K.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Andronenko</surname><given-names>S. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Atsarkin</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Avdeev</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Buchelnikov</surname><given-names>V. D.</given-names></name></name-alternatives><bio xml:lang="en"><p>Chelyabinsk </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>Deminov</surname><given-names>R. G.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Ekomasov</surname><given-names>E. G.</given-names></name></name-alternatives><bio xml:lang="en"><p>Ufa </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>Eremin</surname><given-names>I. M.</given-names></name></name-alternatives><bio xml:lang="en"><p>Bochum</p></bio><xref ref-type="aff" rid="aff-6"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Eremin</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan</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>Fushman</surname><given-names>D.</given-names></name></name-alternatives><bio xml:lang="en"><p>College Park MD</p></bio><xref ref-type="aff" rid="aff-7"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Garifullin</surname><given-names>I. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan</p></bio><xref ref-type="aff" rid="aff-8"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Garif`yanov</surname><given-names>N. N.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan</p></bio><xref ref-type="aff" rid="aff-8"/></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>Kazan</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>Grinberg</surname><given-names>E.</given-names></name></name-alternatives><bio xml:lang="en"><p>Oberkochen</p></bio><xref ref-type="aff" rid="aff-9"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Kalachev</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan</p></bio><xref ref-type="aff" rid="aff-8"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Khamzin</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Krug von Nidda</surname><given-names>H.-A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Augsburg</p></bio><xref ref-type="aff" rid="aff-10"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Kutuzov</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Loidl</surname><given-names>A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Augsburg</p></bio><xref ref-type="aff" rid="aff-10"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Malkin</surname><given-names>B. Z.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Mironov</surname><given-names>G. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>Yoshkar-Ola</p></bio><xref ref-type="aff" rid="aff-11"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Nedopekin</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Nigmatullin</surname><given-names>R. R.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </p></bio><xref ref-type="aff" rid="aff-12"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Nikitin</surname><given-names>S. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Proshin</surname><given-names>Yu. N.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </p></bio><email xlink:type="simple">yurii.proshin@kpfu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Romanova</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Saikin</surname><given-names>S. K.</given-names></name></name-alternatives><bio xml:lang="en"><p>Cambridge, MA</p></bio><xref ref-type="aff" rid="aff-13"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Sadykov</surname><given-names>E. K.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Salakhov</surname><given-names>M. Kh.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </p></bio><xref ref-type="aff" rid="aff-14"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Salikhov</surname><given-names>K. M.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan</p></bio><xref ref-type="aff" rid="aff-8"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Sharin</surname><given-names>E. P.</given-names></name></name-alternatives><bio xml:lang="en"><p>Yakutsk</p></bio><xref ref-type="aff" rid="aff-15"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Shengelaya</surname><given-names>A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Tbilisi</p></bio><xref ref-type="aff" rid="aff-16"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Shilova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Yoshkar-Ola</p></bio><xref ref-type="aff" rid="aff-11"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Sichelschmidt</surname><given-names>J.</given-names></name></name-alternatives><bio xml:lang="en"><p>Dresden</p></bio><xref ref-type="aff" rid="aff-17"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Skirda</surname><given-names>V. D.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Skvortsov</surname><given-names>A. E.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Smirnov</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>Moscow</p></bio><xref ref-type="aff" rid="aff-18"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Sushkov</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Tagirov</surname><given-names>L. R.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </p></bio><xref ref-type="aff" rid="aff-19"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Tagirov</surname><given-names>M. S.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan</p></bio><xref ref-type="aff" rid="aff-12"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Talanov</surname><given-names>Yu. I.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan</p></bio><xref ref-type="aff" rid="aff-8"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="western" xml:lang="en"><surname>Tayurskii</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Useinov</surname><given-names>N. Kh.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan</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>Voronina</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Yusupov</surname><given-names>R. V.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </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>Zhikharev</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="en"><p>Kazan </p></bio><xref ref-type="aff" rid="aff-20"/></contrib></contrib-group><aff xml:lang="en" id="aff-1"><institution>Kazan Federal University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-2"><institution>Baku State University</institution><country>Azerbaijan</country></aff><aff xml:lang="en" id="aff-3"><institution>Institute of Radio Engineering and Electronics</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-4"><institution>Chelyabinsk State University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-5"><institution>Ufa University of Science and Technology</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-6"><institution>Ruhr-Universitat Bochum</institution><country>Germany</country></aff><aff xml:lang="en" id="aff-7"><institution>University of Maryland</institution><country>United States</country></aff><aff xml:lang="en" id="aff-8"><institution>Zavoisky Physical-Technical Institute</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-9"><institution>Carl Zeiss SMT GmbH</institution><country>Germany</country></aff><aff xml:lang="en" id="aff-10"><institution>University of Augsburg</institution><country>Germany</country></aff><aff xml:lang="en" id="aff-11"><institution>Mari State University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-12"><institution>Kazan National Research Technical University (KAI)</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-13"><institution>Kebotix, Inc.</institution><country>United States</country></aff><aff xml:lang="en" id="aff-14"><institution>Kazan Federal University; Academy of Sciences of the Republic of Tatarstan</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-15"><institution>North-Eastern Federal University</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-16"><institution>Ivane Javakhishvili Tbilisi State University</institution><country>Georgia</country></aff><aff xml:lang="en" id="aff-17"><institution>MPI for Chemical Physics of Solids</institution><country>Germany</country></aff><aff xml:lang="en" id="aff-18"><institution>Kapitza Institute for Physical Problems</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-19"><institution>Kazan Federal University; Zavoisky Physical-Technical Institute</institution><country>Russian Federation</country></aff><aff xml:lang="en" id="aff-20"><institution>Kazan National Research Technological University</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>15</day><month>10</month><year>2025</year></pub-date><volume>27</volume><issue>3</issue><elocation-id>25300 (3 pp.)</elocation-id><permissions><copyright-statement>Copyright &amp;#x00A9; Aganov A.V., Aliyev M.N., Aminova A.V., Aminov L.K., Andronenko S.I., Atsarkin V.A., Avdeev M.V., Buchelnikov V.D., Deminov R.G., Ekomasov E.G., Eremin I.M., Eremin M.V., Fushman D., Garifullin I.A., Garif`yanov N.N., Gafurov M.R., Grinberg E., Kalachev A.A., Khamzin A.A., Krug von Nidda H., Kutuzov A.S., Loidl A., Malkin B.Z., Mironov G.I., Nedopekin O.V., Nigmatullin R.R., Nikitin S.I., Proshin Y.N., Romanova I.V., Saikin S.K., Sadykov E.K., Salakhov M.K., Salikhov K.M., Sharin E.P., Shengelaya A., Shilova E.V., Sichelschmidt J., Skirda V.D., Skvortsov A.E., Smirnov A.I., Sushkov S.V., Tagirov L.R., Tagirov M.S., Talanov Y.I., Tayurskii D.A., Useinov N.K., Voronina E.V., Yusupov R.V., Zhikharev V.A., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Aganov A.V., Aliyev M.N., Aminova A.V., Aminov L.K., Andronenko S.I., Atsarkin V.A., Avdeev M.V., Buchelnikov V.D., Deminov R.G., Ekomasov E.G., Eremin I.M., Eremin M.V., Fushman D., Garifullin I.A., Garif`yanov N.N., Gafurov M.R., Grinberg E., Kalachev A.A., Khamzin A.A., Krug von Nidda H., Kutuzov A.S., Loidl A., Malkin B.Z., Mironov G.I., Nedopekin O.V., Nigmatullin R.R., Nikitin S.I., Proshin Y.N., Romanova I.V., Saikin S.K., Sadykov E.K., Salakhov M.K., Salikhov K.M., Sharin E.P., Shengelaya A., Shilova E.V., Sichelschmidt J., Skirda V.D., Skvortsov A.E., Smirnov A.I., Sushkov S.V., Tagirov L.R., Tagirov M.S., Talanov Y.I., Tayurskii D.A., Useinov N.K., Voronina E.V., Yusupov R.V., Zhikharev V.A.</copyright-holder><copyright-holder xml:lang="en">Aganov A.V., Aliyev M.N., Aminova A.V., Aminov L.K., Andronenko S.I., Atsarkin V.A., Avdeev M.V., Buchelnikov V.D., Deminov R.G., Ekomasov E.G., Eremin I.M., Eremin M.V., Fushman D., Garifullin I.A., Garif`yanov N.N., Gafurov M.R., Grinberg E., Kalachev A.A., Khamzin A.A., Krug von Nidda H., Kutuzov A.S., Loidl A., Malkin B.Z., Mironov G.I., Nedopekin O.V., Nigmatullin R.R., Nikitin S.I., Proshin Y.N., Romanova I.V., Saikin S.K., Sadykov E.K., Salakhov M.K., Salikhov K.M., Sharin E.P., Shengelaya A., Shilova E.V., Sichelschmidt J., Skirda V.D., Skvortsov A.E., Smirnov A.I., Sushkov S.V., Tagirov L.R., Tagirov M.S., Talanov Y.I., Tayurskii D.A., Useinov N.K., Voronina E.V., Yusupov R.V., Zhikharev V.A.</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/286">https://www.mrsej.ru/jour/article/view/286</self-uri><abstract><p>On September 29, 2025, Boris Ivanovich Kochelaev, an outstanding theoretical physicist, professor-consultant of the Department of Theoretical Physics at Kazan University, and Doctor of Physical and Mathematical Sciences, passed away at the age of 91.</p></abstract></article-meta></front><back><ref-list><title>References</title></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
