National University of Water management and Nature resources use

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Rivne, Ukraine
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Klimenko M.O.,National University of Water management and Nature resources use | Biedunkova O.O.,National University of Water management and Nature resources use
Vestnik Zoologii | Year: 2016

The article presents the results of the study on nuclear damages or injuries of red blood cells (RBCs) and asymmetry of meristic characters of the European perch (Perca fluviatilis Linnaeus 1758) that lives in small and medium rivers of Rivne Region. The research has found that the species representatives living in the small rivers demonstrated worse cytogenetic homeostasis indicators compared to the fish from the medium rivers: The lowest frequency of P. fluviatilis' nuclear damages appeared to be 4.25 times higher for the individuals living in the small rivers given the noticeable excess of spontaneous mutations by average damage frequency. Fish morphological homeostasis demonstrates a tendency to injuries in small rivers as well. The functional relationships between the studied parameters which have been established by the author were "close" for the fish from the small rivers and primary "moderate" for the fish from the medium rivers. It is concluded that the enhanced activity of the stressors existing in the water environment affects the physiological state of the P. fluviatilis species. © by O. O. Biedunkova 2017.


Kochmarskii V.Z.,National University of Water management and Nature resources use | Gayevskii V.R.,National University of Water management and Nature resources use | Tyshko N.L.,Ivan Franko National University of Lviv
Ukrainian Journal of Physics | Year: 2017

The kinetics of CaCO3 precipitation from model solutions formed by preliminary saturating deionized water with CO2 and by adding NaHCO3 and CaCl2 has been considered. The characteristic feature of the method is the almost simultaneous measurement of the activities of major components of the aqueuos calcium hydrocarbonate system (ACHCS): Ca2+, CO2, HCO− 3, as well as pH and the temperature. CaCO3 crystallization was provided with the help of the CO2 degassing by air. The processes running in the ACHCS during the degassing can be divided into four stages: dissociation of CaHCO+ 3 complexes; formation of crystal nuclei in the solution; a transitive stage, which includes the final phase of crystal nucleation and the initial growth of newly formed crystals; and intensive growth of crystal nuclei, which gives rise to the mass CaCO3 precipitation. The product (Ca2+)·(CO2− 3) is a reaction coordinate for the second stage of CaCO3 precipitation, whereas (Ca2+)·(HCO− 3) for the third and fourth stages. The kinetics of growth of crystal nuclei and their concentration are calculated for the second stage, by using the concept of CaCO3 dissolution product that depends on the crystal nucleus size. During the process of crystal nucleation, the crystal size remains practically stable (≈8 × 10−8 m), and the concentration reaches 1.5 × 10−15 m−3. The mass CaCO3 precipitation (the fourth stage) starts when the crystal nuclei reach dimensions of about 3 × 10−7 m. © V.Z. KOCHMARSKII, V.R. GAYEVSKII, N.L. TYSHKO, 2017.


Moroz M.V.,National University of Water management and Nature resources use | Demchenko P.Y.,Ivan Franko National University of Lviv | Prokhorenko S.V.,Lviv Polytechnic | Moroz V.M.,National University of Water management and Nature resources use
Physics of the Solid State | Year: 2013

Glasses have been prepared by quenching melts in the Ag2GeS3-AgBr system in a range of 0-53 mol % AgBr. The concentration dependences of density, microhardness, glass transition temperatures, and crystallization of alloys have been established. The conductivity of glasses has been investigated by the dc probe method in a range of 240-420 K. The models of the drift motion of silver and halogen ions have been proposed. © 2013 Pleiades Publishing, Ltd.


Gajevskiy V.R.,National University of Water management and Nature resources use
Ukrainian Journal of Physics | Year: 2015

The system CO2 + H2O with the concentration of free carbon dioxide varying from those close to the saturation one to the equilibrium one under environmental conditions has been studied. The dependences of ionic component concentrations on the solution pH are determined. Simultaneous measurements of the electric conductivity and the pH of the solution show that the contributions of ionic components in the carbonate-water system to the electric conductivity of the solution are additive and satisfy the Kohlrausch law with an error not exceeding ±0.5%. © V.R. GAJEVSKIY , 2015.


Kachan N.S.,National University of Water management and Nature resources use
Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu | Year: 2015

Purpose: To create the assessment method of synergistic effect from impact of factors on the state and the dynamic changes in the structure of water economy system of Ukraine (WESU), using an integrated sustainable water use index (ISWUI). To analyze the synergistic effect that arose under the influence of factors for the period 2010-2012. Methodology: Theoretical and methodological basis of the research composed by concepts that are based on the most commonly used in the economic analysis methods of empirical and theoretical research. The system-structural and synergistic methodological approaches became the most relevant in the research. They led to consider WESU as a complicated system, identifying the individual elements and defining relationships between them. The factual basis of the research became the primary data of statistical monitoring of water resources, data of major economic indicators in the regions of Ukraine, indicators of providing public with water, data of medical statistics of health and morbidity of population, that directly or implicitly depend on water pollution. Findings: The feasibility of using a synergistic approach for assessment of the effect, caused by managing of changes in the structure of WESU in regions, was proved. Own interpretation of the concept of "synergistic effect in water economy system" was posted basing on the definition of other scientists. The parameters for evaluating the synergistic effect, created by influence of factors on changes in WESU, were systematized. The way of synergetic effect assessment was formalized and his calculation for the period from 2010 to 2012 in the regions of Ukraine was made. The results were analyzed and the recommendations on the feasibility of using the proposed method were given in order to improve the managing of changes in the structure of WESU. Originality: For the first time, a comprehensive method of assessing the situation in WESU was presented considering various aspects of the industry. A method of synergistic effect assessment was firstly developed based on the synergetic approach that arises in the dynamics under the influence of factors caused by natural and anthropogenic changes. Practical value: The method of assessment of synergistic effect created by managing the changes in WESU from ISWUI is simple, versatile and ensures the reliability of the results. The method can serve as a tool in the management of water economy system of any regional level.


Moroz M.V.,National University of Water management and Nature resources use | Prokhorenko M.V.,Lviv Polytechnic
Russian Journal of Electrochemistry | Year: 2016

The phase composition of alloys in the Ag–Bi–S–I system (in the region AgI–Bi–Bi2S3–BiSI) for Т ≤ 550 K was studied by physicochemical analysis methods. Equations of overall potential-forming reactions involving the BiSI and Bi19S27I3 phases were composed. The reactions were performed in the C|Ag|glass Ag3GeS3I|D|C electrochemical cells (C are inert (graphite) electrodes; Ag, D are the cell electrodes; D are the four-phase alloys of the system; and glass Ag3GeS3I is a membrane with pure Ag+ ion conductivity). The linear dependences of EMF of the cells in the range 485–525 K were used for calculating the standard thermodynamic properties of saturated solid solutions of the compounds BiSI and Bi19S27I3 in the AgI–Bi–Bi2S3–BiSI system. © 2016, Pleiades Publishing, Ltd.


Dvorkin L.,National University of Water management and Nature resources use | Bezusyak A.,National University of Water management and Nature resources use | Lushnikova N.,National University of Water management and Nature resources use | Ribakov Y.,Ariel University
Construction and Building Materials | Year: 2012

Metakaolin forms a part of a complex admixture to self-compacting high-strength concrete. The admixture contains superplasticizer addition of naphthalene formaldehyde or polycarboxylate type, yielding significant improvement in workability and uniformity of fresh concrete mix as well as mechanical properties and durability of hardened concrete. Mathematical modeling of self compacting high strength concrete at the design stage is aimed at determining optimal content of concrete components (in particular, chemical and mineral admixtures) to obtain the desired concrete properties. Three-parameter polynomial models are used for determining the superplasticizer content, required to obtain the same fresh concrete mix workability, hardened concrete compressive strength and correspondingly metakaolin efficiency factor from the strength increase viewpoint. It is demonstrated that the efficiency of metakaolin as an admixture to self compacting high strength concrete depends on the dosage of the first as well as on concrete binder content, water-binder ratio and by the type of superplasticizer used for concrete production. A concrete design method using traditional deterministic and stochastic dependencies is developed. Regression equations, describing the influence of water-binder ratio, binder content and metakaolin portion in binder on superplasticizer content, compressive strength and efficiency factor of metakaolin, are obtained. The concrete design objective function, proposed in this study, allows obtaining the required concrete strength by minimizing the cost of the most unsustainable concrete components, like cement, metakaolin and superplastisizer. © 2012 Elsevier Ltd. All rights reserved.


Moroz M.V.,National University of Water management and Nature resources use | Prokhorenko M.V.,Lviv Polytechnic
Russian Journal of Physical Chemistry A | Year: 2014

The emf (ε) dependence of C|Ag|AgI|glass Ag2GeS 3|D|C galvanic elements on temperature is studied in the range of 470 to 575 K (C represents current electrodes, D denotes equilibrium three-phase alloys of individual Ag-Sb-Se systems, and AgI|glass Ag2GeS 3 is a bilayer membrane with purely ionic (Ag+) electroconductivity). Analytical equations ε = ε(T) are used to calculate the thermodynamic functions of saturated solid solutions of the AgSbSe2, Sb2Se3, and Ag2Se phases of the Ag-Sb-Se system in the standard state. © 2014 Pleiades Publishing, Ltd.


Karpovich I.N.,National University of Water management and Nature resources use
Surface Engineering and Applied Electrochemistry | Year: 2015

The viscosity of a thin liquid layer between ice and a surface of quartz was estimated based on data on the displacement rate of a column of ice inside cylindrical capillaries affected by a nonuniform electric field. © 2015, Allerton Press, Inc.


Rifert V.G.,National Technical University of Ukraine | Sereda V.V.,National University of Water management and Nature resources use
Thermal Science | Year: 2015

Survey of the works on condensation inside smooth horizontal tubes published from 1955 to 2013 has been performed. Theoretical and experimental investigations, as well as more than twenty five methods and correlations for heat transfer prediction are considered. It is shown that accuracy of this prediction depends on the accuracy of volumetric vapor content and pressure drop at the interphase. The necessity of new studies concerning both local heat transfer coefficients and film condensation along tube perimeter and length under annular, stratified, and intermediate regimes of phase flow was substantiated. These characteristics being defined will allow determining more precisely the boundaries of the flow regimes and the methods of heat transfer prediction.

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