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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">dan-402</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>ФИЗИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group></article-categories><title-group><article-title>КВАЗИКРИСТАЛЛИЧЕСКАЯ МОДЕЛЬ РАДИАЛЬНОЙ ФУНКЦИИ РАСПРЕДЕЛЕНИЯ ТВЕРДЫХ ДИСКОВ НА ПЛОСКОСТИ</article-title><trans-title-group xml:lang="en"><trans-title>QUASI-CRYSTAL MODEL OF THE RADIAL DISTRIBUTION FUNCTION FOR HARD DISKS IN THE PLANE</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>Черкас</surname><given-names>Н. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Cherkas</surname><given-names>N. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. физ.-мат. наук, ст. преподаватель</p></bio><bio xml:lang="en"><p>Ph. D. (Physics and Mathematics), Senior Lecturer</p></bio><email xlink:type="simple">n_cherkas@mail.ru</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>Черкас</surname><given-names>С. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Cherkas</surname><given-names>S. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. физ.-мат. наук, ст. науч. сотрудник</p></bio><bio xml:lang="en"><p>Ph. D. (Physics and Mathematics), Senior researcher</p></bio><email xlink:type="simple">cherkas@inp.bsu.by</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Военная Академия Республики Беларусь, Минск</institution></aff><aff xml:lang="en"><institution>Military Academy of the Republic of Belarus, Minsk</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Институт ядерных проблем БГУ, Минск</institution></aff><aff xml:lang="en"><institution>Institute for Nuclear Problems of the Belarusian State University, Minsk</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>28</day><month>04</month><year>2017</year></pub-date><volume>61</volume><issue>2</issue><fpage>18</fpage><lpage>24</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Черкас Н.Л., Черкас С.Л., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Черкас Н.Л., Черкас С.Л.</copyright-holder><copyright-holder xml:lang="en">Cherkas N.L., Cherkas S.L.</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://doklady.belnauka.by/jour/article/view/402">https://doklady.belnauka.by/jour/article/view/402</self-uri><abstract><p>В рамках квазикристаллической модели предложен новый метод описания радиальной функции распределения твердых дисков на плоскости. Радиальная функция распределения моделируется размазыванием квадратной решетки и образованием дефектов типа вакансий. Наилучшие совпадения с радиальной функцией распределения, полученной решением интегрального уравнения Перкуса–Йевика, достигается в результате использования суперпозиции квадратной и гексагональной решеток. Примесь гексагональной решетки существенна на малых расстояниях. Найдены зависимости постоянной решетки, ширины размывания, примеси гексагональной решетки от параметра заполнения. Предполагается, что данный метод будет работать и области более высоких плотностей, где он может быть использован для описания перехода из жидкой фазы в гексатическую и затем в кристаллическую.</p><p> </p></abstract><trans-abstract xml:lang="en"><p>The quasi-crystal model of the radial distribution function for hard disks in the plane is suggested. It is shown that the coincidence with the distribution function, obtained by solving Percus–Yevick’s equation, is found by smoothing a square lattice and injecting vacancy-type defects into it. A better approximation is reached when the lattice is a result of a mixture of smoothened square and hexagonal lattices. Impurity of a hexagonal lattice is considerable at short distances. Dependences of lattice constants, smoothing widths and impurity on the filling parameter are found. In conclusion, it is stated that a basis of such a chaotic system apparently as a gas of hard disks in the plane at rather small filling parameters is a square lattice with some impurity of the hexagonal lattice at small distances. It is of importance to carry out investigations in a range of higher concentration and to compare with the modeling by the Monte-Carlo method.</p><p> </p></trans-abstract><kwd-group xml:lang="ru"><kwd>радиальная функция распределения</kwd><kwd>твердые диски на плоскости</kwd><kwd>вейвлеты</kwd><kwd>квазикристаллическая модель жидкости</kwd></kwd-group><kwd-group xml:lang="en"><kwd>radial distribution function</kwd><kwd>wavelet</kwd><kwd>hard disks in a plane</kwd><kwd>quasicrystal model of liquid</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">Fernandez, J. F. Melting of systems of hard disks by Monte Carlo simulations / J. F. Fernandez, J. J. Alonso, J. Stankiewicz // Phys. Rev. E. – 1997. – Vol. 55, N 1. – P. 750–764. doi.org/10.1103/physreve.55.750.</mixed-citation><mixed-citation xml:lang="en">Fernandez J. F., Alonso J. J., Stankiewicz J. 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