285 research outputs found

    Simulation of adverse factors of mining production influence on stomatological health of mining workers

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    Glazunov O. A. Simulation of adverse factors of mining production influence on stomatological health of mining workers. Journal of Education, Health and Sport. 2017;7(5):552-561. eISSN 2391-8306. DOI http://dx.doi.org/10.5281/zenodo.806078 http://ojs.ukw.edu.pl/index.php/johs/article/view/4527 The journal has had 7 points in Ministry of Science and Higher Education parametric evaluation. Part B item 1223 (26.01.2017). 1223 Journal of Education, Health and Sport eISSN 2391-8306 7 © The Author (s) 2017; This article is published with open access at Licensee Open Journal Systems of Kazimierz Wielki University in Bydgoszcz, Poland Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited. This is an open access article licensed under the terms of the Creative Commons Attribution Non Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited. The authors declare that there is no conflict of interests regarding the publication of this paper. Received: 05.05.2017. Revised: 23.05.2017. Accepted: 31.05.2017. SIMULATION OF ADVERSE FACTORS OF MINING PRODUCTION INFLUENCE ON STOMATOLOGICAL HEALTH OF MINING WORKERS O. A. Glazunov State institution "Dnepropetrovsk Medical Academy of the Ukrainian Ministry of Health Care" Abstract Mathematical modeling of the unfavorable mining factors influence with the help of basic dental indices such as CPITN, PMA, KPU has been carried out. The relationship of these indices with the adverse effect of mining on the dental health of miners was has been established. It has been revealed that with accumulation of job seniority, paraclinical indices negatively change significantly. Key words: mathematical modeling, dental indices, mining production

    Professional adaptation of college students

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    In the article the basic problems of professional orientation, provides a system of professional adaptation of college students, grounded principles and basic elements of system of professional adaptation of college studentsРассмотрены основные проблемы профориентации, предложена система профадаптации студентов колледжа, обоснованы принципы ее построения и основные элемент

    Mathematical modeling of plumes impingement on landing site of "ExoMars" landing platform

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    This paper presents the results of numerical studies of the interaction of underexpanded four supersonic plumes with surfaces. The final stage of controlled landing of “ExoMars” landing platform on the surface of Mars is considered. The altitude of landing platform from 1 to 0.3 meter above the surface of Mars and the thrust level of the propulsion system is varied. The distributions of the parameters of gas near landing platform are obtained during operation of propulsion system at the minimum and maximum thrust. The ground effect lift loss under Mars conditions for given configuration landing platform is investigated. The insignificant of ground effect lift loss at altitude 1 meter was found and value of lift loss varied from 1 % to 3% depending on level of propulsion system thrust. For another altitudes, received significant effect of external pressure on the bottom surface of landing platform. The magnitude of this external pressure reached 26% of the maximum thrust of propulsion system

    Collaborative interpretation of the data obtained by resistivity and ground penetrating radar methods for assessing the permeability of sandy clay soils

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    A method for estimating the filtration factor of sandy clay soils is considered on the basis of a joint interpretation of the data of a set of methods of engineering electrical exploration, including electrical resistivity tomography and ground penetrating radar studies. The solution of this problem is based on the use of known empirical connections between the imaginary and real parts of the complex dielectric permittivity, specific electrical resistance, and Q factor. An example of the effective joint use of the ground penetrating radar and non-contact electrical resistivity tomography shows how to obtain qualitative and quantitative estimates of a changing filtration factor in a draining road layer. It is necessary to use precise engineering geological information in order to provide the required estimates. The proposed approach makes it possible to describe continuous profiles of a pavement and underlying layers by ground penetrating radar and electrical resistivity tomography, as well as to assess soil properties when conducting an electrical survey from the surface of asphalt concrete pavement. Recommendations for the implementation of the developed methods of complex engineering and geophysical research are given for solving issues of repair work design, supervision, and quality control of road construction

    Characterizing Polarization-MIMO Antennas in Random-LOS Propagation Channels

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    Abstract-In the 5G system, we foresee the use of LOSdominated mm-wave radio links to moving users being subject to slow fading resulting from the users' random locations and orientations. We refer to this as a Random-LOS channel. MIMO processing algorithms will be used in 5G to improve performance in slow fading, similar to how they are used in Rayleigh fading. To this end, we study the probability of detection (PoD) in the Random-LOS channel when there are dual-polarized antennas on both sides of the link. We introduce two polarization deficiencies: the polarization non-orthogonality and the amplitude imbalance between the ports of a two-port antenna. The MIMO efficiency is evaluated as a function of these deficiencies. In the analysis, we consider the MRC algorithm for one bitstream, and the ZF and SVD algorithms for two bitstreams. We also present two analytical formulas for the MIMO efficiency that can be used to determine performance. We use the formulas on two ideally orthogonal dipoles, and show by means of coverage plots how much the 1-and 2-bitstream performances degrade due to the polarization deficiencies in off-boresight directions

    Mathematical investigation of pressure pulsations characteristics and natural acoustic frequencies in the gas-dynamic channel

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    Paper presents a numerical simulation of the occurrence of flow instability and pressure self-oscillations for a complex configuration of the gas-dynamic tract in combustion chamber. Unsteady axisymmetric two-dimensional Navier-Stokes equations are used for mathematical modelling of compressible one-phase medium. To simulate turbulence, the k-ε and LES models were used. Fast Fourier Transform (FFT) determined the frequency spectrum of pressure pulsations in the combustion chamber. It is shown that in the case of a simple geometry of the free gas cavity in combustion chamber, both models of turbulence make it possible to determine the spectrum of the natural acoustic frequencies. Using the LES model in the case of complex geometry makes it possible to predict the hydrodynamic structure of a flow accurately. The flow, in this case, has an intensive vortex generation. Formation of small-scale vortex occurs in the near-wall regions and large eddies in the core of a flow. Frequency of large eddies formation can be combined with the natural acoustic frequencies of combustion chamber and can affect the amplitude of pressure pulsation

    Calculation and experimental study on high-speed impact of heat-resistant coating materials with a meteoric particle

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    The given article presents the conducted calculation and experimental study on destruction of heat-resistant coating material of an aircraft in the process of high-speed interaction of the steel spherical projectile. The projectile is imitating a meteoric particle. The study was conducted in the wide range of velocities. The mathematical behavioral model of heat-resistant coating under high-speed impact was developed. The interaction of ameteoric particle with an element of the protective structure has especially individual character and depends on impact velocity and angle, materials of the interacting solids
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