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  1. Book ; Online: Power-law multi-wave model for COVID-19 propagation in countries with nonuniform population density

    Grinchuk, P. S. / Fisenko, S. P.

    2020  

    Abstract: The phenomenological mathematical model of COVID-19 spreading is proposed for large countries with geographical differentiation of population density. According to the model COVID-19 spreading takes the form of several spatio-temporal waves developing ... ...

    Abstract The phenomenological mathematical model of COVID-19 spreading is proposed for large countries with geographical differentiation of population density. According to the model COVID-19 spreading takes the form of several spatio-temporal waves developing almost independently and simultaneously in areas with different population density. The intensity of each wave is described by a power-law dependence. The parameters of dependence are determined by real statistical data at the initial stage of the disease spread. The results of the model simulation were verified using statistical data for the Republic of Belarus. Based on the developed model, a forecast calculation was made at the end of May, 2020. The accuracy of forecasting the total number of cases for a period of 3 months in the proposed approach was about 3 percent.

    Comment: The forecast was published for the first time on June 01, 2020 (https://doi.org/10.24108/preprints-3112063)
    Keywords Physics - Biological Physics ; Quantitative Biology - Populations and Evolution
    Publishing date 2020-12-11
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Cluster size distribution in percolation theory and fractal Cantor dust.

    Grinchuk, Pavel

    Physical review. E, Statistical, nonlinear, and soft matter physics

    2007  Volume 75, Issue 4 Pt 1, Page(s) 41118

    Abstract: ... of finite cluster structure, in particular, they give a different value of exponent zeta (lnn{s ... approximately -s{zeta}). Therefore, a more precise fractal model for describing the structure of clusters ... of this exponent on the fraction of occupied sites p, which was revealed by numerical simulations. Additionally ...

    Abstract Results of numerical simulation of cluster size distribution in the site percolation problem are presented. These results disagree with the theoretical data obtained on the basis of the standard drop model of finite cluster structure, in particular, they give a different value of exponent zeta (lnn{s} approximately -s{zeta}). Therefore, a more precise fractal model for describing the structure of clusters in a percolation system is proposed. The consideration is based on the solution of a kinetic equation for the number of finite clusters. In the framework of the proposed approach (fractal model together with kinetic equation), a correct value of exponent zeta is obtained and an explanation is given to the dependence of this exponent on the fraction of occupied sites p, which was revealed by numerical simulations. Additionally, a relation is established between the characteristics of cluster size distribution and fractal dimension of the Cantor dust constructed on the percolation cluster.
    Language English
    Publishing date 2007-04
    Publishing country United States
    Document type Journal Article
    ISSN 1539-3755
    ISSN 1539-3755
    DOI 10.1103/PhysRevE.75.041118
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  3. Article: Isothermal evaporation rate of deposited liquid aerosols and the SARS-CoV-2 coronavirus survival

    P. Grinchuk S. / E. Fisenko I. / S. Fisenko P. / S. Danilova-Tretiak M.

    Abstract: It is shown that the evaporation rate of a liquid sample containing the culture of coronavirus affects its survival on a substrate. Possible mechanisms of such influence can be due to the appearance of large, about 140 bar, non comprehensive capillary ... ...

    Abstract It is shown that the evaporation rate of a liquid sample containing the culture of coronavirus affects its survival on a substrate. Possible mechanisms of such influence can be due to the appearance of large, about 140 bar, non comprehensive capillary pressures and the associated dynamic forces during the movement of the evaporation front in a sample with the virus. A simulation of isothermal evaporation of a thin liquid sample based on the Stefan problem was performed. The comparison of simulation data and recent experiments on the coronavirus survival on various surfaces showed that the rate of isothermal evaporation of aqueous samples, which is higher for heat-conducting materials, correlates well with the lifetime of the coronavirus on these surfaces.
    Keywords covid19
    Publisher arxiv
    Document type Article
    Database COVID19

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  4. Article: Vybor lechebnoĭ taktiki u bol'nykh khronicheskim tonzillitom streptokokkovoĭ étiologii i dlitel'nym subfebrilitetom.

    Yanov, Yu K / Mal'tseva, G S / Drozdova, M V / Zakharova, G P / Grinchuk, O N

    Vestnik otorinolaringologii

    2019  Volume 84, Issue 1, Page(s) 64–67

    Abstract: The objective of the present study was to develop the optimal therapeutic strategy for the management of the patients with chronic tonsillitis (CT) of streptococcal etiology accompanied by subfebrility of long duration (LDS). The clinical characteristic ... ...

    Title translation The choice of the treatment strategy for the patients presenting with chronic tonsillitis of streptococcal etiology and subfebrility of long duration.
    Abstract The objective of the present study was to develop the optimal therapeutic strategy for the management of the patients with chronic tonsillitis (CT) of streptococcal etiology accompanied by subfebrility of long duration (LDS). The clinical characteristic of the patients presenting with this condition is presented together with the results of their treatment by different methods. It is shown that bilateral tonsillectomy is the most efficient approach to the management of the patients presenting with chronic tonsillitis of streptococcal etiology and subfebrility of long duration.
    MeSH term(s) Chronic Disease ; Humans ; Streptococcal Infections/therapy ; Streptococcus ; Tonsillectomy ; Tonsillitis/therapy
    Language Russian
    Publishing date 2019-04-01
    Publishing country Russia (Federation)
    Document type Journal Article
    ZDB-ID 124096-1
    ISSN 0042-4668
    ISSN 0042-4668
    DOI 10.17116/otorino20198401164
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  5. Article: Isothermal evaporation rate of deposited liquid aerosols and the SARS-CoV-2 coronavirus survival

    Grinchuk, P. S. / Fisenko, E. I. / Fisenko, S. P. / Danilova-Tretiak, S. M.

    Abstract: It is shown that the evaporation rate of a liquid sample containing the culture of coronavirus affects its survival on a substrate. Possible mechanisms of such influence can be due to the appearance of large, about 140 bar, non comprehensive capillary ... ...

    Abstract It is shown that the evaporation rate of a liquid sample containing the culture of coronavirus affects its survival on a substrate. Possible mechanisms of such influence can be due to the appearance of large, about 140 bar, non comprehensive capillary pressures and the associated dynamic forces during the movement of the evaporation front in a sample with the virus. A simulation of isothermal evaporation of a thin liquid sample based on the Stefan problem was performed. The comparison of simulation data and recent experiments on the coronavirus survival on various surfaces showed that the rate of isothermal evaporation of aqueous samples, which is higher for heat-conducting materials, correlates well with the lifetime of the coronavirus on these surfaces.
    Keywords covid19
    Publisher ArXiv
    Document type Article
    Database COVID19

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  6. Book ; Online: Isothermal evaporation rate of deposited liquid aerosols and the SARS-CoV-2 coronavirus survival

    Grinchuk, P. S. / Fisenko, E. I. / Fisenko, S. P. / Danilova-Tretiak, S. M.

    2020  

    Abstract: It is shown that the evaporation rate of a liquid sample containing the culture of coronavirus affects its survival on a substrate. Possible mechanisms of such influence can be due to the appearance of large, about 140 bar, non comprehensive capillary ... ...

    Abstract It is shown that the evaporation rate of a liquid sample containing the culture of coronavirus affects its survival on a substrate. Possible mechanisms of such influence can be due to the appearance of large, about 140 bar, non comprehensive capillary pressures and the associated dynamic forces during the movement of the evaporation front in a sample with the virus. A simulation of isothermal evaporation of a thin liquid sample based on the Stefan problem was performed. The comparison of simulation data and recent experiments on the coronavirus survival on various surfaces showed that the rate of isothermal evaporation of aqueous samples, which is higher for heat-conducting materials, correlates well with the lifetime of the coronavirus on these surfaces.

    Comment: 6 pages, 3 figures
    Keywords Physics - Medical Physics ; Physics - Biological Physics ; covid19
    Publishing date 2020-04-22
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article: Large clusters in supercritical percolation.

    Grinchuk, P S

    Physical review. E, Statistical, nonlinear, and soft matter physics

    2002  Volume 66, Issue 1 Pt 2, Page(s) 16124

    Abstract: ... The correlation between the critical exponents zeta that determine the cluster decay law (ln n(s) approximately -s ... surface area, the first correction to the cluster decay law above percolation threshold (ln n(s) approximately ... s((d-1)/d)) has been found on the basis of the drop model and the derived system of equations ...

    Abstract The statistical behavior of the size of large finite clusters in supercritical percolation on a finite lattice is investigated (below the critical dimension of the space d(c)=6). For this purpose, an approximate system of ordinary differential equations for a number of finite clusters is obtained. The correlation between the critical exponents zeta that determine the cluster decay law (ln n(s) approximately -s(zeta)) and the surface of clusters is shown. It is found that for clusters without self-intersections having a maximal surface zeta=1. For clusters with a small number of self-intersections zeta=1-eta. Here eta is a function depending on the ratio of the surface area of a cluster to its size, which tends to zero, when the surface tends to a maximum. For compact clusters with a minimum or near-minimum surface area, the first correction to the cluster decay law above percolation threshold (ln n(s) approximately -s((d-1)/d)) has been found on the basis of the drop model and the derived system of equations. The predictions are tested numerically on two- and three-dimensional lattices by Monte Carlo simulations. The results of the work allow one to conclude that above the percolation threshold majority of large clusters are compact and that the cluster surface is the main factor affecting its behavior in supercritical percolation.
    Language English
    Publishing date 2002-07
    Publishing country United States
    Document type Journal Article
    ISSN 1539-3755
    ISSN 1539-3755
    DOI 10.1103/PhysRevE.66.016124
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  8. Article: Effect of random internal structure on combustion of binary powder mixtures.

    Grinchuk, P S / Rabinovich, O S

    Physical review. E, Statistical, nonlinear, and soft matter physics

    2005  Volume 71, Issue 2 Pt 2, Page(s) 26116

    Abstract: Combustion of a mixture of two solid reactants is considered. A combined geometrical and physicochemical model of mixing of these reactants is proposed. The model takes into account random distribution of reactants and voids over the system. This allows ... ...

    Abstract Combustion of a mixture of two solid reactants is considered. A combined geometrical and physicochemical model of mixing of these reactants is proposed. The model takes into account random distribution of reactants and voids over the system. This allows description of incomplete burning of reactants. The model is used for studying the combustion wave propagation in a binary heterogeneous mixture. The obtained results are compared with those calculated from the perfect-mixing model, which implies that the deficient (with respect to the stoichiometry) component burns completely. It is shown that micrononuniformity of mixing not only reduces the combustion wave temperature and velocity but also can lead to a shift of the maximal wave velocity away from the stoichiometric composition of the mixture. The results of this study allow us to suggest that one of the main reasons for such a shift, which was observed in a number of experimental works, is structural disorder of binary mixtures.
    Language English
    Publishing date 2005-02
    Publishing country United States
    Document type Journal Article
    ISSN 1539-3755
    ISSN 1539-3755
    DOI 10.1103/PhysRevE.71.026116
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  9. Article: Surfaces of percolation systems in lattice problems.

    Grinchuk, P S / Rabinovich, O S

    Physical review. E, Statistical, nonlinear, and soft matter physics

    2003  Volume 67, Issue 4 Pt 2, Page(s) 46103

    Abstract: The internal and external surface area of a percolation cluster along with a full surface area of whole percolation system are investigated both analytically and numerically. Numerical simulation is performed by a Monte Carlo method for site and bond ... ...

    Abstract The internal and external surface area of a percolation cluster along with a full surface area of whole percolation system are investigated both analytically and numerically. Numerical simulation is performed by a Monte Carlo method for site and bond problems on square and simple cubic lattices. It is shown that both the external and full surface areas of a percolation cluster as well as the full surface area of the whole percolation system have maxima for a certain share of occupied sites (for the site problem) or permeable bonds (for a bond problem). On the basis of a probabilistic approach, analytical expressions are obtained which relate the surface area of percolation cluster to its density. The last value has been studied in more details at present that allows to analyze the behavior of the above-mentioned surface for various lattices. Two particular technological processes are discussed where the surface area of a percolation cluster plays an important part: generation of electric current in a fuel cell and self-propagating high-temperature synthesis in heterogeneous condensed systems.
    Language English
    Publishing date 2003-04
    Publishing country United States
    Document type Journal Article
    ISSN 1539-3755
    ISSN 1539-3755
    DOI 10.1103/PhysRevE.67.046103
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  10. Article: [CHARACTERISTIC OF ENDOMETRIAL MESENCHYMAL STEM CELLS IN CULTURE OBTAINED FROM PATIENT WITH ADENOMYOSIS].

    Shilina, M A / Domnina, A P / Kozhukharova, I V / Zenin, V V / Anisimov, S V / Nikolsky, N N / Grinchuk, T M

    Tsitologiia

    2015  Volume 57, Issue 11, Page(s) 771–779

    Abstract: ... passage 6-7) showed that healthy donor's cells had predominantly normal karyotype. The cellular line ... from a patient with diagnosis of "adenomyosis" had a lot of cells with changes in karyotype's structure ... these cells entered into a phase of replicative aging. Based on this, we can conclude that founded karyotype's ...

    Abstract Adenomyosis is form of endometriosis, common diseases of female reproductive system, which can lead to infertility in women. in this study we are obtained and characterized cell line endometrial mesenchymal stem cells from a patient with adenomyosis, and compare obtained cells with the cell line of healthy donor. Aim of this study was to assesses the extent of differences between cells from donor with adenomyosis and cells from healthy donor. Was established that compared lines had morphology like fibroblasts, were differentiated in adipocytes, were expressed mesenchymal markers and didn't expressed haematopoietic markers. Cytogenetic analysis of differentially stained metaphase chromosomes on G-banding (passage 6-7) showed that healthy donor's cells had predominantly normal karyotype. The cellular line from a patient with diagnosis of "adenomyosis" had a lot of cells with changes in karyotype's structure. These changes were related with aneuploidy of cellular population and the presence non-random chromosomal breaks, often in chromosomes 7 and 11. Analysis of this data allows the cells from adenomyosis characterized physiological stability in culture and karyotypic instability with non-random involvement certain chromosomal set. The cellular line obtained from donor with adenomyosis showed signs destabilization of he genome, typical for cell transformation. Division of adenomyosis cells to the 26th passage is stopped and these cells entered into a phase of replicative aging. Based on this, we can conclude that founded karyotype's hanges do not lead to transformation and immortalization of cells in vitro.
    MeSH term(s) Adenomyosis/genetics ; Adenomyosis/metabolism ; Adenomyosis/pathology ; Aneuploidy ; Cellular Senescence ; Chromosomes, Human, Pair 11/genetics ; Chromosomes, Human, Pair 11/metabolism ; Chromosomes, Human, Pair 7/genetics ; Chromosomes, Human, Pair 7/metabolism ; Endometrium/metabolism ; Endometrium/pathology ; Female ; Humans ; Mesenchymal Stromal Cells/metabolism ; Mesenchymal Stromal Cells/pathology
    Language Russian
    Publishing date 2015
    Publishing country Russia (Federation)
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 280565-0
    ISSN 0041-3771
    ISSN 0041-3771
    Database MEDical Literature Analysis and Retrieval System OnLINE

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