Rivne State Humanitarian University

Rivne, Ukraine

Rivne State Humanitarian University

Rivne, Ukraine

Time filter

Source Type

Mashchenko V.A.,Rivne State Humanitarian University | Sadovenko I.O.,National Mining University
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu | Year: 2014

Purpose. To analyze the influence of structural and morphological, and elastic characteristics of defects on the features of the structure and deformation of some sandstones based on the modeling approach and interpretation of experimental data of velocity of longitudinal and transverse acoustic waves. Methodology. We have involved a series of experimental studies of density, porosity, and determination of the velocity of propagation of longitudinal and transverse acoustic waves in samples of sandstone with different structural organization. Findings. The elastic parameters of defects of solid structure were calculated based on the velocities of propagation of acoustic waves for sandstones with different effective Poisson's ratio. The normal and tangential compliances with the effective Poisson's ratio of sandstone were comparatively analyzed. Poisson's ratio of the medium matrix was calculated based on the variations of the velocities of propagation of acoustic waves under the influence of external pressure. Originality. The deformation behavior of sandstones was considered on the basis of the model of microinhomogeneous medium as an elastic matrix and planar defects inclusions. Theoretical estimates of the parameters of defects, based on the elastic constants of linear elasticity theory, indicate the adequacy of the model to describe the strain state of imperfectly elastic rock. The possibility of the existence of negative Poisson's ratio in sandstones with high normal compressibility and the contribution of the contact interactions were theoretically justified. Practical value. Theoretical estimates of the parameters of defects, based on the elastic constants of linear elasticity theory, indicate the adequacy of the model to describe the strain state of imperfectly elastic rock. There were obtained the relations for evaluation of normal and tangential compliance on the basis of effective elastic moduli microinhomogeneous medium, elastic moduli and the Poisson's ratio of the matrix medium. It is shown that the concentrations of defects in their compliance and effective Poisson's ratio have an inverse relationship, which determines the strain-elastic properties of the medium of propagation of acoustic waves.


Rudyk B.P.,National University of Water management and Nature resources use | Nechyporuk B.D.,Rivne State Humanitarian University | Novoseletskyy N.Y.,Rivne State Humanitarian University | Syaskyy V.A.,Rivne State Humanitarian University | Tataryn B.A.,Lesya Ukrainka Eastern European National University
Journal of Physical Studies | Year: 2015

Nowadays ZnO nanoparticles attracted considerable attention due to their physical and chemical properties for a potential use in electronics, optoelectronics and laser technology. This has great economic and environmental advantages due to cheap raw materials, environment- and biofriendliness of zinc oxide. There are a few direct (like SEM microscopy) and indirect (like X-ray peak broadening using the Sherrer formula) methods to determine the dimensioning of nanocrystals. A perfect crystal has infinite dimensions, so any finite crystal is imperfect by definition. This imperfection leads to an increase in X-ray peak broadening. Analyzing the X-ray diffraction pattern can quickly make an assessment of average size of the nanocrystals (Sherrer) and lattice strain (Williamson–Hall) that are caused by defects in the surface, packaging, dislocations, etc. A more thorough analysis of the size distribution of nanoparticles by their number, shape, etc., can be performed using direct methods such as SEM microscopy. In this article we try to compare the results of the dimensioning obtained by direct and indirect methods. The ZnO nanoparticles were prepared by the electrolytic method using zinc electrodes and the NaCl solution as electrolyte at the temperature of 82°C. The obtained powder was studied by X-ray diffraction analysis and it showed wurtzite structure of zinc oxide nanoparticles. Size and lattice strain of the nanoparticles were calculated by X-ray peak broadening using the methods of Sherrer and Williamson-Hall. The mean particle size of ZnO nanoparticles was compared to the results obtained by scanning electron microscopy. © 2015, Ivan Franko National University of Lviv. All rights reserved.


Kapitula S.Y.,Rivne State Humanitarian University | Nechiporuk B.D.,Rivne State Humanitarian University | Danilevskaya N.B.,Lesya Ukrainka Eastern European National University | Tatarin B.A.,Lesya Ukrainka Eastern European National University
Journal of Nano- and Electronic Physics | Year: 2015

It is shown the possibility of production of the nanoparticles compounds cadmium electrolyte method using cadmium electrode and table salt as an electrolyte. When the temperature of the electrolyte 98 °C obtained nanoparticle CdCO3, β-Cd (OH)2 and γ-Cd (OH)2 dimensions which are estimated by the formula Debye-Šerrera at 22 nm, 21 nm 19 nm respectively. The contents of the data of the compounds was determined by the XRD method. Analysis of the influence of synthesis conditions on the content of cadmium Carbonate. © 2015 Sumy State University.


Danilevska N.B.,Rivne State Humanitarian University | Moroz M.V.,National University of Water management and Nature resources use | Nechyporuk B.D.,Rivne State Humanitarian University | Novoseletskiy N.E.,Rivne State Humanitarian University | Yukhymchuk V.O.,Institute of Semiconductor Physics of Ukraine
Journal of Nano- and Electronic Physics | Year: 2016

The effect of concentration of sodium thiosulfate and the temperature of the electrolyte in the process of obtaining cadmium sulfide nanocrystals electrolyte method using cadmium electrodes. X-ray diffraction studies were used to determine the size of the nanocrystals using the Debye-Scherrer formula and method of Williamson-Hall. Comparison of the results of XRD studies the results of Raman spectroscopy and differential thermal analysis. © 2016 Sumy State University.


Danilevskaya N.B.,Rivne State Humanitarian University | Moroz N.V.,National University of Water management and Nature resources use | Nechyporuk B.D.,Rivne State Humanitarian University | Rudyk B.P.,National University of Water management and Nature resources use
Journal of Nano- and Electronic Physics | Year: 2016

The possibility of obtaining zinc oxide and sulfide nanocrystals by electrolytic method using sodium thiosulfate solution as the electrolyte is given. Received samples were examined by methods of X-ray diffraction analysis and absorption spectrometry. The size of nanoparticles is defined by Williamson-Hall and Debye-Scherrer methods. Found that the nanocrystals data of substances are in tension, which affect the value of the broadening of x-ray peaks. © 2016 Sumy State University.


Gaevs'kyi V.R.,National University of Water management and Nature resources use | Nechyporuk B.D.,Rivne State Humanitarian University | Novoselets'kyi N.Y.,Rivne State Humanitarian University | Rudyk B.P.,National University of Water management and Nature resources use
Ukrainian Journal of Physics | Year: 2013

A possibility of electrolytic fabrication of zinc oxide nanocrystals with the use of zinc electrodes and the aqueous solution of sodium chloride as an electrolyte has been demonstrated. The xray analysis of obtained nanoparticles shows that their size is of the order of 30 nm. The researches of the electrolyte transmission spectra registered after the main experiment has been terminated show that the energy gap width in ZnO nanoparticles is 3.35 eV, which agrees with the corresponding value for ZnO single crystals. © V.R. GAEVSKYI, B.D. NECHYPORUK,N.YU. NOVOSELETSKYI, B.P. RUDYK, 2013.


Kolupaev B.B.,Ukrainian Academy of Sciences | Klepko V.V.,Ukrainian Academy of Sciences | Lebedev E.V.,Ukrainian Academy of Sciences | Kolupaev B.S.,Rivne State Humanitarian University
Polymer Science - Series A | Year: 2010

Phonon relaxation and internal friction in kaolin-and bentonite-filled PVC composites are studied. By varying the temperature and/or content of the ultrafine mineral filler in the PVC, one can control the contribution from phonon viscosity, damping force, and the effect of viscosity into the energy dissipation of ultrasonic oscillations in the MHz frequency interval. The dynamic character of the measurements makes it possible to differentiate between relaxation phenomena in the composites and to suggest methods for their controlled changes. © Pleiades Publishing, Ltd., 2010.


Gud' V.N.,Rivne State Humanitarian University | Kolupaev B.S.,Rivne State Humanitarian University | Malinovskiy E.V.,Rivne State Humanitarian University
Surface Engineering and Applied Electrochemistry | Year: 2012

The influence of radiation on the dielectric dispersion and the conductivity of the most wide-spread linear amorphous polymers in industry is studied, i. e., polyvinyl chloride, poly(methyl methacrylate), and polystyrene. The initial samples were exposed to radiation at T = 25°C for 45 days; as the source of radiation, 226Ra was used. The nuclei of 226Ra emit alpha rays with an energy of 4.777 MeV and gamma quanta with an energy of 0.188 MeV. Our study confirms that the changes in the real parts of the complex dielectric permittivity and electrical conductivity depend on the type of polymer and the dose of irradiation. The most significant effect of radiation is observed in the case of polystyrene. © 2012 Allerton Press, Inc.


Krivtsov V.V.,Rivne State Humanitarian University | Malinovsky Y.V.,Rivne State Humanitarian University
Journal of Nano- and Electronic Physics | Year: 2014

Electretic state and radiation absorption of nanocomposites consisting of polymer matrix and metal particles filler obtained in result of electric explosion are investigated. Stable thermoelectrets of polymer metal-filled systems that have better electert properties than traditional polymer materials are obtained. Suggested method of composite polymer system creation enables to obtain shielded materials with better radiative absorption, resistant to external actions, cost-efficient. © 2014 Sumy State University.


Kolupaev B.B.,Rivne State Humanitarian University | Levchuk V.V.,Rivne State Humanitarian University | Maksimtsev Y.R.,Rivne State Humanitarian University | Kolupaev B.S.,Rivne State Humanitarian University
Surface Engineering and Applied Electrochemistry | Year: 2015

The results of studies of the acoustic properties of polyvinylchloride (PVC) with a nanofiller (Cu) prepared by the electric explosion of wires have been described. It has been shown that, under a longitudinal and shearing deformation at a frequency of 0.4 MHz in a wide range of temperatures and component concentrations, the viscoelastic properties of the material are formed owing to the interaction at the polymer-filler interface and the occurrence of topological effects. The application of PVC systems under dynamic and temperature loads has been specified. © 2015, Allerton Press, Inc.

Loading Rivne State Humanitarian University collaborators
Loading Rivne State Humanitarian University collaborators