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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Contemporary Mathematics. Fundamental Directions</journal-id><journal-title-group><journal-title xml:lang="en">Contemporary Mathematics. Fundamental Directions</journal-title><trans-title-group xml:lang="ru"><trans-title>Современная математика. Фундаментальные направления</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2413-3639</issn><issn publication-format="electronic">2949-0618</issn><publisher><publisher-name xml:lang="en">Peoples’ Friendship University of Russia named after Patrice Lumumba (RUDN University)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">28998</article-id><article-id pub-id-type="doi">10.22363/2413-3639-2021-67-3-526-534</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">An Improved Blow-Up Criterion for the Magnetohydrodynamics with the Hall and Ion-Slip Effects</article-title><trans-title-group xml:lang="ru"><trans-title>Улучшенный критерий разрушения решений для магнитогидродинамики с эффектами Холла и скольжения ионов</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Gala</surname><given-names>S.</given-names></name><name xml:lang="ru"><surname>Гала</surname><given-names>С.</given-names></name></name-alternatives><email>sadek.gala@gmail.com</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ragusa</surname><given-names>M. A.</given-names></name><name xml:lang="ru"><surname>Рагуза</surname><given-names>М. А.</given-names></name></name-alternatives><email>maragusa@dmi.unict.it</email><xref ref-type="aff" rid="aff3"/><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff id="aff1"><institution>Ecole Normale Supe'rieure of Mostaganem</institution></aff><aff id="aff2"><institution>Universita' di Catania</institution></aff><aff-alternatives id="aff3"><aff><institution xml:lang="en">Universita' di Catania</institution></aff><aff><institution xml:lang="ru">Maria Alessandra Ragusa Universita' di Catania</institution></aff></aff-alternatives><aff id="aff4"><institution>RUDN University</institution></aff><pub-date date-type="pub" iso-8601-date="2021-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2021</year></pub-date><volume>67</volume><issue>3</issue><issue-title xml:lang="en">Dedicated to 70th anniversary of the President of the RUDN University V. M. Filippov</issue-title><issue-title xml:lang="ru">Посвящается 70-летию президента РУДН В. М. Филиппова</issue-title><fpage>526</fpage><lpage>534</lpage><history><date date-type="received" iso-8601-date="2021-10-23"><day>23</day><month>10</month><year>2021</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2021, Contemporary Mathematics. Fundamental Directions</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2021, Современная математика. Фундаментальные направления</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="en">Contemporary Mathematics. Fundamental Directions</copyright-holder><copyright-holder xml:lang="ru">Современная математика. Фундаментальные направления</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-nd/4.0/deed.en</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.rudn.ru/CMFD/article/view/28998">https://journals.rudn.ru/CMFD/article/view/28998</self-uri><abstract xml:lang="en"><p style="text-align: justify;">In this work, we consider the magnetohydrodynamics system with the Hall and ion-slip effects in R<sup>3</sup>. The main result is a sufficient condition for regularity on a time interval [0,<italic>T</italic>] expressed in terms ∞,∞ of the norm of the homogeneous Besov space <math xmlns:mml="http://www.w3.org/1998/Math/MathML"><semantics><msubsup><mover><mi>B</mi><mo>˙</mo></mover><mrow><mo>∞</mo><mo>,</mo><mo>∞</mo></mrow><mn>0</mn></msubsup><annotation encoding="LaTeX">{\dot{B}_{\infty,\infty}^0}</annotation></semantics></math> with respect to the pressure and the BMO-norm with respect to the gradient of the magnetic field, respectively</p>&#13;
<p style="text-align: center;"><math xmlns:mml="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msubsup><mo>∫</mo><mn>0</mn><mi>T</mi></msubsup><mo>(</mo><msubsup><mrow><mo>‖</mo><mi>Δ</mi><mi>π</mi><mo>(</mo><mi>t</mi><mo>)</mo><mo>‖</mo></mrow><msubsup><mover><mi>B</mi><mo>˙</mo></mover><mrow><mo>∞</mo><mo>,</mo><mo>∞</mo></mrow><mn>0</mn></msubsup><mrow><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msubsup><mo>+</mo><msubsup><mrow><mo>‖</mo><mi>Δ</mi><mi>B</mi><mo>(</mo><mi>t</mi><mo>)</mo><mo>‖</mo></mrow><mrow><mi>B</mi><mi>M</mi><mi>O</mi></mrow><mn>2</mn></msubsup><mo>)</mo><mi>d</mi><mi>t</mi><mo>&lt;</mo><mo>∞</mo></mrow><annotation encoding="LaTeX">{\int_{0}^{T} ({\| \Delta \pi(t)\|}^{2/3}_{\dot{B}_{\infty,\infty}^0} + {\| \Delta B (t)\|}^{2}_{BMO} ) dt&lt;\infty}</annotation></semantics></math>,</p>&#13;
<p style="text-align: justify;">which can be regarded as improvement of the result in [3].</p></abstract><trans-abstract xml:lang="ru"><p style="text-align: justify;">В R<sup>3</sup> рассматривается магнитогидродинамическая система с эффектами Холла и скольжения ионов. Основной результат работы - достаточное условие регулярности на отрезке времени [0,<italic>T</italic>]. Для давления этот результат выражен в терминах норм в однородных пространствах Бесова <math xmlns:mml="http://www.w3.org/1998/Math/MathML"><semantics><msubsup><mover><mi>B</mi><mo>˙</mo></mover><mrow><mo>∞</mo><mo>,</mo><mo>∞</mo></mrow><mn>0</mn></msubsup><annotation encoding="LaTeX">{\dot{B}_{\infty,\infty}^0}</annotation></semantics></math>, для градиента магнитного поля - в терминах BMO-норм, а именно:</p>&#13;
<p style="text-align: center;"><math xmlns:mml="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msubsup><mo>∫</mo><mn>0</mn><mi>T</mi></msubsup><mo>(</mo><msubsup><mrow><mo>‖</mo><mi>Δ</mi><mi>π</mi><mo>(</mo><mi>t</mi><mo>)</mo><mo>‖</mo></mrow><msubsup><mover><mi>B</mi><mo>˙</mo></mover><mrow><mo>∞</mo><mo>,</mo><mo>∞</mo></mrow><mn>0</mn></msubsup><mrow><mn>2</mn><mo>/</mo><mn>3</mn></mrow></msubsup><mo>+</mo><msubsup><mrow><mo>‖</mo><mi>Δ</mi><mi>B</mi><mo>(</mo><mi>t</mi><mo>)</mo><mo>‖</mo></mrow><mrow><mi>B</mi><mi>M</mi><mi>O</mi></mrow><mn>2</mn></msubsup><mo>)</mo><mi>d</mi><mi>t</mi><mo>&lt;</mo><mo>∞</mo></mrow><annotation encoding="LaTeX">{\int_{0}^{T} ({\| \Delta \pi(t)\|}^{2/3}_{\dot{B}_{\infty,\infty}^0} + {\| \Delta B (t)\|}^{2}_{BMO} ) dt&lt;\infty}</annotation></semantics></math></p>&#13;
<p style="text-align: justify;">Этот результат улучшает результат работы [3].</p></trans-abstract><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Beale J., Kato T., Majda A. Remarks on breakdown of smooth solutions for the three-dimensional Euler equations// Commun. Math. Phys. - 1984. - 94. - С. 61-66.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Chemin J.-Y. Perfect incompressible fluids. - New York: Clarendon Press &amp; Oxford University Press, 1998.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Fan J., Jia X., Nakamura G., Zhou Y. On well-posedness and blowup criteria for the magnetohydrodynamics with the Hall and ion-slip effects// Z. Angew. Math. Phys. - 2015. - 66. - С. 1695-1706.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Gala S., Ragusa M. A. On the blow-up criterion of strong solutions for the MHD equations with the Hall and ion-slip effects in R3// Z. Angew. Math. Phys. - 2016. - 67.- С. 18.</mixed-citation></ref><ref id="B5"><label>5.</label><mixed-citation>Kozono H., Taniuchi Y. Bilinear estimates in BMO and the Navier-Stokes equations// Math. Z. - 2000. - 235. - С. 173-194.</mixed-citation></ref><ref id="B6"><label>6.</label><mixed-citation>Maiellaro M. Uniqueness of MHD thermodiffusive mixture flows with Hall and ion-slip effects// Meccanica. - 1977. - 12.- С. 9-14.</mixed-citation></ref><ref id="B7"><label>7.</label><mixed-citation>Mulone G., Salemi F. Some continuous dependence theorems in MHD with Hall and ion-slip currents in unbounded domains// Rend. Accad. Sci. Fis. Mat. Napoli. - 1988. - 55. - С. 139-152.</mixed-citation></ref><ref id="B8"><label>8.</label><mixed-citation>Mulone G., Solonnikov V. A. On an initial boundary-value problem for the equation of magnetohydrodynamics with the Hall and ion-slip effects// J. Math. Sci. (N.Y.). - 1997. - 87. - С. 3381-3392.</mixed-citation></ref><ref id="B9"><label>9.</label><mixed-citation>Triebel H. Theory of function spaces. - Basel: Birkha¨user, 1983.</mixed-citation></ref><ref id="B10"><label>10.</label><mixed-citation>Zhou Y. Regularity criteria for the 3D MHD equations in terms of the pressure// Int. J. Nonlinear Mech. - 2006. - 41. - С. 1174-1180.</mixed-citation></ref></ref-list></back></article>
