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


Wyświetlanie 1-5 z 5
Tytuł:
Mathematical model of the optimization of fire extinguishing time length in the woodworking enterprises` workshops
Autorzy:
Hulida, E.
Koval, O.
Powiązania:
https://bibliotekanauki.pl/articles/410712.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
mathematical model
optimization
isolation
fire liquidation
fire extinguishing agent
fire extinguishing equipment
Opis:
On the grounds of an analysis of the existing criteria of decision making during the fire extinguishing organization process the differential criteria is recommended for solving the optimization mathematical models. The mathematical model of the optimization of fire extinguishing time length in the woodworking enterprises` workshops is developed; it is based on the determination of a fire area during the time of its unobstructed development, the amount of the devices for the fire extinguishing agent supply, the amount of the fire and salvage units (hereinafter FSU), equipment and evacuation facilities, the duration of the fire isolation and extinguishing as well as its final liquidation. The Monte Carlo method is used for solving the mathematical optimization model. The solving of the mathematical optimization model is conducted by applying the computer hardware and application program package, written in C++ language.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2015, 4, 1; 39-43
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
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:
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:
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
Tytuł:
Evaluation of strength of carrying metal structures of trailers
Autorzy:
Popovych, P.
Poberezhny, L.
Shevchuk, O.
Murovanyi, I.
Dovbush, T.
Koval, Yu.
Hrytsuliak, H.
Powiązania:
https://bibliotekanauki.pl/articles/368623.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
trailer
strength
design model
metal construction
bearing frame
potential of minimum potential energy
stress-strain state
przyczepa
wytrzymałość
model projektowy
konstrukcja metalowa
rama nośna
energia potencjalna
stan naprężenie-odkształcenie
Opis:
Purpose: Development of a computational model of stress-strain state bearing elements of trailer frames for preliminary assessment and identification of areas with increased risk of failure. Design/methodology/approach: The object of the study is the processes of loading the load-bearing metal structures of trailers - fertilizer spreaders. The stress-strain state of the spreader bearing system is investigated for the established three typical cases of external load. To refine the values obtained as a result of modelling, they were determined in SOLIDWORKS. Findings: Computational models of load have been compiled by improving the method of minimum potential deformation energy for its effective correct use in analytical studies of a similar type of metal structures. It is proved that for a flat closed frame structure made of thin-walled profiles, loaded with forces perpendicular to the plane of the frame, the levelling of compression and shear energies, as well as axial and transverse forces and bending moments in the horizontal plane does not significantly affect the calculation results. Research limitations/implications: Horizontal components of the shear forces as well as the normal forces and as a consequence the corresponding potential deformation energy are neglected, which has some effect on the accuracy of the calculations. Practical implications: An effective tool for strength analysis with preliminary assessment and diagnostics of load-bearing metal structures based on the constructed calculation models of stress strain state load-bearing frames of typical geometry with an arbitrarily given distribution of external load. Originality/value: A universal algorithm for recording additive functions of bending and torques, as well as the potential deformation energy of welded frames of trailers.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2020, 100, 2; 58-69
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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