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Wyszukujesz frazę "Koval, V." wg kryterium: Autor

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    Wyświetlanie 1-11 z 11
    Tytuł:
    Tekhnologija ochistki stochhykh bod mjasopererabatyvajushhikh predirijatijj
    Wastewater treatment technologies of meat processing plants
    Autorzy:
    Koval'chuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/77804.pdf
    Data publikacji:
    2013
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2013, 15, 6
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Issledovanie effektivnocti tekhnologii reagentnogo udalenija ammonijjnogo azota iz ctochnykh vod v vide struvita
    The research of the effectiveness of reagent technology ammonium nitrogen removal from wastewater as a struvite
    Autorzy:
    Koval'chuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/77130.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    waste water
    magnesium ammonium phosphate
    treatment technology
    technological parameter
    experimental study
    theoretical study
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 6
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nonlinear Theory of Plasma-Beam Superheterodyne Free Electron Laser of Dopplertron Type with Non-Axial Injection of Electron Beam
    Autorzy:
    Kulish, V.
    Lysenko, A.
    Oleksiienko, G.
    Koval, V.
    Rombovsky, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1377573.pdf
    Data publikacji:
    2014-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.60.Cr
    Opis:
    We have developed a quadratic nonlinear theory of a plasma-beam superheterodyne free electron laser of dopplertron type with the non-axial injection of an electron beam with respect to the guiding magnetic field. It is found out that the studied device can work in four different modes of operation. We determine the modes that have maximum gain coefficients of electromagnetic signals. It is shown that for all the operating modes the amplification factor of an electromagnetic signal is enhanced when the electron beam injection angle is increased.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 6; 1263-1268
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Forming of Ultrashort Electromagnetic Clusters by Two-Stream Superheterodyne Free Electron Lasers
    Autorzy:
    Kulish, V.V.
    Lysenko, A.
    Rombovsky, M.
    Koval, V.
    Volk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030315.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.60.Cr
    Opis:
    We construct a cubic nonlinear self-consistent theory of multiharmonic two-stream superheterodyne free electron lasers of a klystron type, intended to form powerful ultrashort clusters of an electromagnetic field. Plural three-wave parametric resonant interactions of wave harmonics have been taken into account. The two-stream superheterodyne free electron lasers mode in which the first harmonic of a space-charge wave is much smaller than the critical frequency of two-stream instability has been used for forming of the powerful ultrashort clusters of electromagnetic waves. We carry out amplitude, phase and spectral analyses of the processes occurring in such devices. We found out the conditions necessary for the forming of the ultrashort clusters of an electromagnetic field. We demonstrate the possibility of the ultrashort electromagnetic cluster formation in the multiharmonic two-stream superheterodyne free electron lasers-type systems.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 213-221
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ochistka stochnykh vod predprijatijj po proizvodstvu koncentrirovannogo jablochnogo soka
    Wastewater treatment of concentrated apple juice production plants
    Autorzy:
    Koval'chuk, V.
    Koval'chuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/77731.pdf
    Data publikacji:
    2015
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    apple juice concentrated
    chemical technology
    biological treatment
    waste water
    experimental research
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 6
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a scenario-based project management system construction in enterprises with the functional organizational structure
    Rozwój systemu zarządzania opartego o scenariusze w przedsiębiorstwach o funkcjonalnej organizacji struktury
    Autorzy:
    Koval, O.V.
    Kuzminykh, V.A.
    Voronko, M.P.
    Khaustov, D.V.
    Powiązania:
    https://bibliotekanauki.pl/articles/408885.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    project engineering
    optimal scheduling
    process planning
    probability
    inżynieria projektu
    optymalne planowanie
    proces planowanie
    prawdopodobieństwo
    Opis:
    Commonly accepted point is that functional organization structure is a poor environment for project management. The scenario repository approach is designed especially to support project management in environment with great amount of operational activity taking into account, that in such cases, project tasks have their reflection in the tasks of business-processes. Creation of a special project and operation task management tools set allows to create a new approach in change management in enterprises with functional organization structure, optimize the processes, involved in project management activities, compile the knowledge base of project and operational task management using the project task - operational task mapping to reveal the bottle necks of both.
    Ogólnie przyjętym punktem widzenia jest to, że funkcjonalna organizacja struktury jest słabą podstawą do zarządzania projektami. Podejście oparte o scenariusze zostało specjalnie zaprojektowane do wsparcia zarządzania projektami w środowisku o dużej aktywności operacyjnej zwłaszcza, że cele projektu mają swoje odbicie w celach procesów biznesowych. Opracowanie specjalnego zestawu narzędzi i operacji do zarządzania projektami pozwala stworzyć nowe podejście do zarządzania zmianami w przedsiębiorstwach z funkcjonalną organizacją struktury, optymalizować procesy związane z zarządzaniem projektami, zbudować bazę wiedzy projektu i operatywnego zarządzania zadaniami przy wykorzystaniu głównego celu projektu - zadanie operacyjne wykrywania „wąskich gardeł”.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2013, 4; 26-30
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Sensitivity of Autotrophic and Heterotrophic Microorganisms to the Pollution of Natural Water with Rare Earth Elements (Lanthanum and Cerium)
    Autorzy:
    Lozhkina, Roza A.
    Olkova, Anna S.
    Koval, Ekaterina V.
    Tomilina, Irina I.
    Sysolyatina, Maria A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086379.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    rare earth elements
    lanthanum
    cerium
    bioassay
    Nostoc linckia
    Chlorella vulgaris
    Paramecium caudatum
    Escherichia coli
    Opis:
    The purpose of the work was to compare the sensitivity of autotrophic and heterotrophic organisms used in bioassay to lanthanum and cerium under the conditions of a model experiment with aqueous media. Using bioassay methods, the pre-lethal effects of La and Ce in heterotrophic Paramecium caudatum and Escherichia coli, as well as autotrophic Chlorella vulgaris and Nostoc linckia were determined. Model solutions of La2 (SO4)3∙8H2O and Ce2 (SO4)3∙8H2O were tested in the concentration range of 0.1–200 mg/l. As a result, it was shown that heterotrophic organisms are more sensitive to water pollution with La and Ce than autotrophic ones. According to the totality of experiments, cerium turned out to be more toxic than lanthanum. When planning the environmental studies of wastewater or reservoirs polluted with REE, it is recommended to focus on comparative sensitivity of bioassay methods, taking into account the test-functions used: bioassay for chemotaxis of P. caudatum > bioassay for changes in bioluminescence of E. coli (strain M-17) > bioassay for the content of chlorophyll а and intensity of lipid peroxidation in N. linckia > bioassay on the increase in the number of Cl. vulgaris.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 4; 58--63
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of electrolyte composition on the plasma electrolyte oxidation and phase composition of oxide ceramic coatings formed on 2024 aluminium alloy
    Autorzy:
    Posuvailo, V. M.
    Kulyk, V. V.
    Duriagina, Z. A.
    Koval’chuck, I. V.
    Student, M. M.
    Vasyliv, B. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818491.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    microstructure
    hydrogen peroxide
    porosity
    plasma electrolyte synthesis
    plasma electrolyte oxidation
    mikrostruktura
    nadtlenek wodoru
    porowatość
    Opis:
    Purpose: Purpose of this work is to analyse the process of synthesis of oxide ceramic coatings in plasma electrolytes on 2024 aluminium alloy and to form an electrolyte which allows to reduce energy consumption for the coating formation. Design/methodology/approach: The oxide ceramic coatings were synthesized on 2024 aluminium alloy. The coatings were formed by the alternate application of anode and cathode pulses to the sample. X-ray diffraction analysis of coatings was performed on a DRON-3.0 X-ray diffractometer using CuKa radiation. The thickness of the coatings was determined using a CHY TG-05 thickness gauge. The porosity of the coatings was investigated by analysing the micrographs of the plasma electrolyte oxidation (PEO) coatings obtained on a scanning electron microscope at x500 magnification using the image processing technique. Findings: The electrolyte with 5 g/l H2O2 additive have been elaborated as an optimal composition for synthesis of a coating with an increased content of corundum (a-Al2O3) as compared to a coating synthesized in the same mode in the 3KOH+2Na2SiO3 electrolyte without H2O2. This synthesis mode allows obtaining a coating with a high corundum content at low energy consumption. Research limitations/implications: For further optimization of the synthesis modes, it is necessary to analyse the influence of the phase composition and porosity of the obtained oxide ceramic coatings on their microhardness, wear resistance, and corrosion resistance. Practical implications: Based on the developed modes of synthesis of the coatings, it will be possible to obtain wear and corrosion resistant oxide ceramic coatings with predetermined functional properties and to reduce energy consumption for their formation. Originality/value: Methods for accelerating the formation of coatings have been proposed and tested, in particular, by adding various amounts of hydrogen peroxide to the electrolyte. The content of oxides in the obtained coatings, in particular, their ratios at various concentrations of hydrogen peroxide in the electrolyte, were determined by X-ray phase analysis. The modes of synthesis of the coatings were developed which allow obtaining a continuous coating without cracks with simultaneous decreasing porosity from 4.32% to 3.55-3.53%.
    Źródło:
    Archives of Materials Science and Engineering; 2020, 105, 2; 49--55
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of ¹H-¹³C Cross Polarization in Nuclear Magnetic Resonance of Poly(3-hydroxybutyrate)
    Autorzy:
    Koval'aková, M.
    Fričová, O.
    Hutníková, M.
    Hronský, V.
    Olčák, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032838.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.nj
    79.60.Fr
    61.05.Qr
    Opis:
    Poly(3-hydroxybutyrate) (PHB) is a semicrystalline biodegradable polymer with chains consisting of methyl (CH₃), methylene (CH₂), methine (CH) and carbonyl (CO) groups. The ¹H-¹³C cross polarization NMR measurements were performed on an as-supplied powder PHB sample at a magic-angle spinning rate of 10 kHz. The measured cross polarization build-up curves and their analysis provided information on the dynamics of ¹H-¹³C NMR cross polarization in functional groups with directly bonded hydrogens. The measurements required setting up the Hartmann-Hahn condition, which was inferred from the Hartmann-Hahn matching profiles measured for each functional group. The cross polarization build-up curves displayed an oscillatory course, which indicates the presence of rigid ¹H-¹³C spin pairs isolated from the lattice. The frequency of the observed oscillations is directly proportional to the ¹H-¹³C dipolar coupling constant, which is related to the C-H distance and its value also reflects the mobility of particular functional groups. The values of dipolar coupling constants were derived from splittings in the Fourier transforms of cross polarization build-up curves. The mobility of particular groups was assessed with the order parameter ⟨S⟩ calculated using experimental and rigid lattice values of dipolar coupling constants.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1162-1164
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of the Degree of Crystallinity of Partially Crystalline Polypropylenes Using $\text{}^{13}C$ NMR
    Autorzy:
    Hronský, V.
    Koval'aková, M.
    Vrábel, P.
    Uhrínová, M.
    Olčák, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1378162.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.41.+e
    76.60.-k
    81.05.Lg
    Opis:
    The paper deals with a method for the estimation of the degree of crystallinity for partially-crystalline isotactic-polypropylenes (i-PP) using high-resolution solid-state $\text{}^{13}C$ NMR. For this purpose direct polarization $\text{}^{13}C$ MAS NMR spectra were measured for i-PP samples with different degrees of crystallinity at 98°C. The areas beneath the resonance lines in these spectra correspond to the number of carbons in particular functional groups, while the widths and shapes of the lines reflect the degree of crystallinity, crystalline modifications, distribution of chain conformations and the chain mobility. The $\text{}^{13}C$ MAS NMR spectra, measured using appropriate combination of delay time and high proton decoupling field, made it possible to detect only amorphous domains in the sample. This enabled identification of the lines associated with the amorphous domains in the complete $\text{}^{13}C$ MAS NMR spectra and provided sufficient information for reliable estimation of the degree of crystallinity. The heteronuclear Overhauser enhancement of the $\text{}^{13}C$ NMR signals due to short delay time was taken into account in our calculations.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 409-410
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Solid State $\text{}^{13}C$ NMR Study of Modified Polyhydroxybutyrate
    Autorzy:
    Vrábel, P.
    Hronský, V.
    Fričová, O.
    Koval'aková, M.
    Chodák, I.
    Alexy, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1382700.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.41.+e
    76.60.-k
    81.05.Lg
    Opis:
    Structural changes in polyhydroxybutyrate (PHB) brought about by addition of chain extender and/or plasticizer were studied using $\text{}^{13}C$ MAS NMR spectra, which were measured using the direct polarization technique at 30 and 98°C. Four resonances associated with the CO, CH, $CH_{2}$ and $CH_{3}$ groups of PHB were observed in the spectra. The $CH_{3}$ resonance appearing at 98°C shows splitting into two lines related to the crystalline and amorphous regions. Analysis of the $CH_{3}$ resonances made it possible to estimate the influence of applied modifications on crystallinity and distribution of conformations in amorphous and crystalline domains of PHB samples.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 419-420
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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