The Bulletin of the Adyghe State University,<br />
the series “Natural-Mathematical and Technical Sciences” The Bulletin of the Adyghe State University,
the series “Natural-Mathematical and Technical Sciences”
Đóññêèé Đóññêèé
Home page   Subjects   Chief Editor   Editors   Instructions to Authors   Rules of the reviewing   Subscription   Contacts   Publishing house
Journal archive

Founder

Publisher
Address: 385000, Maikop, Adyghea Republic, Pervomayskaya Street, House 208. Ph.: 8(8772) 52 48 55

Search
Key words:
Author:

#4 / 2019

Biological Sciences

  • Kazachko S.V., Tuguz A.R., Shapovalov M.I.
    Atmospheric air pollutants as a risk factor for the development of cardiovascular diseases among the population of the Republic of Adyghea

    Growth of cardiovascular diseases at inhabitants of the Republic of Adyghea from 2015 to 2018 correlates with the content in atmospheric air of toxic chemical compounds (pollutants) – nitrogen dioxide IV (NÎ2) (r=0,925) and sulphur dioxide (SO2) (r=1,000), and carbon oxide II (CO) (r=0,919). Most common are cardiovascular diseases developing under the influence of gaseous substances that contaminate the atmospheric air of the Republic of Adyghea for many years: arterial hypertension, myocardial infarction, ischemic heart disease, cerebrovascular pathologies (ischemic brain stroke, etc.), diseases of veins, lymphatic vessels and lymph nodes.

    pdf 47-55.pdf  (1 Mb)

  • Botasheva T.L., Rudova O.I., Vasilyeva V.V., Zheleznyakova E.V., Zavodnov O.P., Elzhorukaeva Zh.A., Babayan K.T.
    The relationship of hemodynamic processes in the uteroplacental complex and blood flow in the venous system of the lower extremities during pregnancy

    The purpose of this work is to study the nature of venous blood flow in the lower extremities in relation to hemodynamics in the uteroplacental complex in case of placental dysfunction and uncomplicated pregnancy. Materials and methods: using dopplerometry we determined blood flow parameters in the venous system of the lower extremities, maternal and fetal vessels in 115 pregnant women with uncomplicated pregnancy and in 109 women with placental dysfunction. Results: while progressing the gestational age, there is a decrease in speed indicators in superficially femoral veins both on the right and left legs, however, the degree of explicitity of vein dilatation is more pronounced in case of placental dysfunction. In the same group, a more pronounced asymmetry of venous blood flow was recorded, with maximum of blood flow velocity in the left leg. Valvular dysfunction prevailed in the venous vessel in the right leg. Conclusion: as gestation progresses, regardless of the nature of its course, increasing vasodilation of the superficial veins of the lower extremities is gradually formed, prevailing on the right side and leading to a decrease in venous blood flow velocity. As the term of labor approaches, due to the increased pressure in the pelvis, the load on the valvular apparatus increases, especially on the right side, which is more pronounced in case of placental dysfunction. Changes in the veins of both lower limbs are more pronounced in case of complicated pregnancy. The detected gestational patterns of venous blood flow are associated with the likelihood of hemodynamic deviations in the maternal and fetal vessels in more than half of the cases studied.

    pdf 56-62.pdf  (686 Kb)

  • Kuzenko M.V.
    Selection value of the world collection of VIR oats in conditions of North-West Caucasus South Foothills Zone

    The paper studies the samples of oat of different ecological-geographical origin. The author gives an assessment of resistance to unfavourable conditions of autumn-winter period, standing ability, main diseases, grain yield and weight of 1000 grains. Samples are isolated according to the complex of household-valuable characteristic, and recommended as the initial material for selection of new varieties.

    pdf 63-67.pdf  (320 Kb)

  • Panesh O.A.
    Adventive plants of the Republic of Adygea

    The “aliens”, alien (adventive) species and native (autochthonous) species simultaneously inhabit in the flora of the Republic of Adyghea. Their introduction into the flora of the Republic took place at different times. This was falicitated by a number of reasons, one of which was the absence of phytophages and parasites in the new territory. Morphological features and physiological properties of adventive species are diverse and allow them to successfully break in cultivated crops and natural communities.

    pdf 68-73.pdf  (633 Kb)

    Mathematics

  • Shumafov M.M.
    Second order stochastic differential equations: stability, dissipativity, periodicity. I.

    This paper reviews results concerning qualitative properties of second order stochastic differential equations and systems. The properties, which we address, are stochastic stability, stochastic dissipativity and existence of stationary and periodic solutions. Two types of perturbed random processes, white noise and process with bounded mathematical expection, are considered. The work consists of two parts. In the first part we give a short overview on stability of solutions of second order stochastic differential equations by Lyapunov functions techniques. Here we present some mathematical prelimanaries from probability theory and stochastic processes. In the second part we will define the notion of stochastic integrals in Ito and Stratonovich forms. Then we define stochastic differential equations in the Ito and in the Stratonovich sense. Sufficient conditions of stability on probability, exponential stability in mean square of solutions of second order differential equations and systems will be given. Also, sufficient conditions of dissipativity of the second order stochastic systems are rendered. Sufficient conditions for existence of stationary and periodic solutions of systems considered are provided. A comparation between stability conditions for the stochastic equations interpreted in the Ito and in the Stratonovich sense is made. As an example a harmonic oscillator perturbed by random process of the type of white noise and a process with bounded mathematical expectation is considered.

    pdf 11-27.pdf  (597 Kb)

  • Tlyachev V.B., Ushkho D.S., Ushkho A.D.
    On the absence of limit cycles by systems of differential equations involving analytic functions

    We consider the question of the absence of periodic trajectories in a dynamic system, the right part of which is analytical. The conditions imposed on the right side of the system under which there are no limit cycles are formu-lated.

    pdf 28-33.pdf  (795 Kb)

  • Roytenberg V.S.
    On bifurcations of a closed trajectory, tangent to a surface of discontinuity of a vector field

    The paper considers a piecewise smooth vector field depending on a parameter. We describe bifurcations of a hyperbolic closed trajectory of a field after it touched the surface of discontinuity when the parameter changes.

    pdf 34-41.pdf  (481 Kb)

  • Ushkho D.S., Tlyachev V.B., Ushkho A.D.
    On straight lines assigned to trajectories of a plane cubic differential system

    Based on the concept of straight lines assigned to the trajectories of a plane cubic differential system, we present a new proof of the well-known theorem of Yu.S. Ilyashenko that the closed trajectory of a cubic system is an S-finite star, where 0 is less than or equal to S is less than or equal to 4.

    pdf 42-46.pdf  (410 Kb)

    Technical Sciences

  • Gura D.A., Dubenko Yu.V., Buchatsky P.Yu., Markovsky I.G., Khusht N.I.
    Monitoring of complex infrastructure facilities

    Timely monitoring and diagnosis of the condition are an integral part of the operation of civilian infrastructure. This issue is especially relevant for complex engineering structures: bridges, tunnels, multilevel transport interchanges. Currently, monitoring of such objects mainly comes down to their periodic visual and instrumental examination, where the human factor plays an important role. In addition, this method of monitoring the condition of the above objects does not allow you to quickly detect the problem and take appropriate measures to eliminate it and prevent possible further damage to the entire structure. One of the effective ways to solve this problem is to use computer vision technology for continuous automatic monitoring of complex objects of civilian infrastructure. The aim of the study is to analyze the latest advances in computer vision in order to find the most suitable algorithms for creating a stationary automated system for monitoring the state of infrastructure. As a result of the work, the modern achievements of foreign scientific teams in the field of computer vision were reviewed and described. The main types of algorithms for detecting deformations of engineering structures through the use of photo and video data are structured and presented in a table with a description of their main advantages and disadvantages. Recommendations on the appropriateness of using one or another of the analyzed algorithms in the aspect of monitoring civilian infrastructure are made. The block diagram of the optimal version of a stationary automated system for monitoring the state of infrastructure facilities is given. The operation process of such a scheme is described with the specification of the basic functions performed by each of its links, the data are analyzed, on the basis of which recommendations on appropriate techniques are proposed. They will be applied in the subsequent development of a video surveillance system for the state of infrastructure facilities.

    pdf 74-80.pdf  (346 Kb)

  • Dovgal V.À., Dovgal D.V.
    A survey of the integration possibilities of cloud computing and Internet of things

    Cloud computing is an important and widely used technology that allows users to access a shared pool of network resources. In addition, the Internet of things (IoT) has emerged as a new technology that allows multiple network objects to communicate with each other over wired or wireless networks. This article discusses the reference architectures and definitions of these two technologies proposed by the National Standard, as well as their security concerns and proposed solutions. The article discusses the latest trends in cloud computing and IoT research.

    pdf 81-86.pdf  (324 Kb)

  • Rybanov A.A.
    Diversity metrics of data types for physical schema of data base MySQL

    When designing information system databases, one important step is to correctly select the field data types in the tables. The following dominance measures are used to estimate the diversity of data types in the physical database schema: Simpson's diversity index, Shannon diversity index, Simpson's evenness index, Pielou evenness index. Comparison of applicability of the diversity indices used in ecology to assess the distribution of data types for physical schemes of databases is carried out. A comparative analysis of diversity indices of data types for physical database schemes has shown that the values of some indices are subject to certain rules. It is offered to use diversity indices for quality assessment of physical schemes of databases. The indices discussed in the paper can also be used to build new database complexity assessment models.

    pdf 87-90.pdf  (316 Kb)

  • Gaytov B.Kh., Kashin Ya.M., Kopelevich L.E., Samorodov A.V., Khristoforov M.S.
    Analysis of the issues of electric power supply of agro-industrial enterprises using an example of the federal state-owned enterprise Armavir Biofactory

    An analysis of the problems of electricity supply to agricultural enterprises is given based on the example of the Armavir Biofactory. To solve the problems of uninterrupted power supply, it is proposed to use hybrid wind-solar generator sets as additional power for electric consumers.

    pdf 91-96.pdf  (364 Kb)

  • Kizdermishov A.A., Kizdermishova S.Kh.
    Installing CMS Joomla 3.9.12 on the Ubuntu 18.04 LTS operating system

    The article deals with issues related to the installation of content management systems as part of the task of developing corporate portals. A detailed description of the installation of CMS Joomla 3.9.12 on the Ubuntu 18.04 LTS operating system is proposed.

    pdf 97-102.pdf  (301 Kb)

  • Buchatsky P.Yu., Teploukhov S.V., Onishchenko S.V., Platonov A.S., Avdzhiyan A.A., Avdeev V.E.
    Implementation of the power assessment appliance for renewable energy sources

    The work deals with the approach to the creation of a software and hardware complex for obtaining meteorological data. A device for obtaining data on wind speed is implemented, software for their processing is considered. Based on the results obtained, it is possible to draw up recommendations for the selection of the best energy supply system using renewable energy sources.

    pdf 103-108.pdf  (609 Kb)

  • Meretukova S.K., Shishkhova S.K.
    Globally distributed data processing in models of information interaction of subjects of digital economy

    The article discusses the latest technologies in the field of the digital economy, which allow optimizing the production process and creating competitive advantages in the context of globalization of the world economy, the prospects and problems of their use.

    pdf 109-117.pdf  (358 Kb)

  • Malykhina M.P., Chastikova V.A., Dinmukhametov T.G., Petrov V.Ya.
    Method of detecting malware based on convolutional neural networks

    The article is devoted to the study of the application of convolutional neural networks of deep learning to the task of malware detection. The main features of convolutional neural networks are affected. An algorithm for preliminary processing of input data for analysis by a neural network is considered, based on the creation of images of executable files in a black and white color palette. In this algorithm, each image point is assigned a color corresponding to the value of a specific byte of the executable file. The proposed algorithm was implemented using the Python pro-gramming language. As a result of its application, a set of images was obtained for training and testing a neural net-work. To analyze the obtained images, the convolutional neural network architecture based on the Keras open neural network library was designed and implemented.

    pdf 118-124.pdf  (580 Kb)

  • Kudaev R.H., Kashin Ya.M., Kopelevich L.E., Samorodov A.V.
    Analysis of methods for processing biomaterials with an electromagnetic field

    The article provides the analysis of the influence of the electromagnetic field of extremely low frequencies on various biomaterials, the analysis of methods and technical solutions in this field.

    pdf 125-128.pdf  (292 Kb)