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

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    Wyświetlanie 1-13 z 13
    Tytuł:
    Educational effects on the labor market in Poland: data analysis and modelling
    Autorzy:
    Żyra, J.
    Shevchuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/95145.pdf
    Data publikacji:
    2012
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    unemployment
    educational mismatch
    higher education
    2SLS and VAR estimates
    career path monitoring
    bezrobocie
    edukacja wyższa
    monitorowanie ścieżki kariery
    Opis:
    Although a higher student enrollment in Poland is a pro-growth factor, it is not ruled out that it contributes to a higher unemployment through one of three channels such as: (i) negative productivity effects, (ii) excessive administrative regulations, (iii) educational mismatches. In turn, educational mismatches could be a result of the “wrong” field of study choice, lack of proper competences (skills) or over-education. Our study reveals that the expansion of students on humanities, economics/business and engineering fields of study could be one of the reasons behind higher unemployment rate, but this is not the case for science/mathematics studies. The most important aspects of modeling of labor market educational effects are discussed in the context of the graduates career path monitoring project.
    Źródło:
    Information Systems in Management; 2012, 1, 3; 245-257
    2084-5537
    2544-1728
    Pojawia się w:
    Information Systems in Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Charge Transfer in Complex Oxides
    Autorzy:
    Shevchuk, V.
    Kayun, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1550460.pdf
    Data publikacji:
    2010-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.-i
    72.80.-r
    77.22.Gm
    77.84.-s
    Opis:
    The electrophysical properties (temperature-frequency dependence of conductivity and dielectric constant, current of depolarization) of complex oxide single crystals (Ca-Ga-Ge-garnet, Ca-Ga-germanate, Pb-, Ca-, Cd-tungstates) are analyzed. The experimental results for different crystallographic axes were obtained in the frequency range 10-$10^{5}$ Hz and temperature range 290-650 K. The main parameters of conductivity and depolarization currents are determined. The nature of polarization charge induced by applied external field is discussed using the model of polarization at hopping exchange of charge between complex dipolar defects and space-inhomogeneous distribution of charge in the sample. Existence of small polarons in the crystals is considered.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 1; 150-154
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Matematicheskaja model' razdavlivanija semjan maslichnykh kul'tur
    Mathematical model of seeds crush of oil-bearing crops
    Autorzy:
    Shevchuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/76328.pdf
    Data publikacji:
    2015
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    seed
    crushing machine
    compression
    seed deformation
    destruction
    energy consumption
    mathematical model
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2015, 17, 4
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of agricultural import demand in Ukraine
    Autorzy:
    Shevchuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/94837.pdf
    Data publikacji:
    2014
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    agricultural import
    Kalman filter
    exchange
    rate effects
    price and income effects
    filtr Kalmana
    efekty kursowe
    cena
    efekty dochodowe
    Opis:
    Based on the monthly data from four aggregated agricultural sectors for the 2001−2014 period, this paper investigates the determinants of demand for agricultural imports in Ukraine by using the time-varying parameter technique (the Kalman filter). The outcome suggests that the real exchange rate depreciation contributes to a lower demand for meat, fish and dairy products; vegetable oil and foodstuffs, while not affecting demand for wheat and vegetables. Domestic industrial output correlates with a higher demand for all four groups of agricultural imports. Import substitution effect of domestic agricultural production is found for three out of four groups of agricultural imports, except meat, fish and dairy products. Following an increase in international prices, there is a decrease in demand for wheat and vegetables, as well as for foodstuffs, while there is an opposite effect in demand for other groups, i.e. meat, fish and dairy products and vegetable oil.
    Źródło:
    Information Systems in Management; 2014, 3, 3; 201-211
    2084-5537
    2544-1728
    Pojawia się w:
    Information Systems in Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of exchange rate effects and complimentaries between agriculture and industry in Ukraine
    Autorzy:
    Shevchuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/94973.pdf
    Data publikacji:
    2016
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    agriculture
    industry
    nominal exchange rate
    Ukraine
    Opis:
    This paper examines links between the exchange rate, agricultural and industrial outputs in Ukraine. This is estimated using monthly data for the 2001−2015 period. Results provide evidence that there is a positive spillover from agriculture to industry, being in line with modern arguments on the role of agricultural sector in economic growth (infrastructural spillovers, rural income effects, provision of resources for an industrialized economy). However, industrial output squeezes out agricultural production in the short run. Depreciation of the nominal (real) exchange rate has an expansionary effect on industrial output, but it is harmful for agriculture. From a policy perspective, the results suggest that agriculture-supporting policies should be productive in the industrialization context either.
    Źródło:
    Information Systems in Management; 2016, 5, 3; 401-412
    2084-5537
    2544-1728
    Pojawia się w:
    Information Systems in Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of fiscal policy effects on agriculture and industry in Ukraine
    Autorzy:
    Shevchuk, V.
    Kopych, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/95019.pdf
    Data publikacji:
    2017
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    agriculture
    industry
    fiscal policy
    nominal exchange rate
    real exchange rate
    Ukraine
    Opis:
    This paper analyses the effects of fiscal policies upon agriculture and industry in Ukraine, with the SVAR model using quarterly data for the 2001–2016 period. The results indicate a positive effect of the government spending on both agricultural production and industrial output, while an increase in the government revenue is of the same expansionary impact for the latter only. Among other results, there is a weak negative short-lived spillover from agriculture to industry, with no causality running on the reverse. As agricultural production in Ukraine is associated with a higher level of government spending in the short run, a direction of causality seems to be just the opposite for industrial output. Both agriculture and industry bring about higher budget revenues in the short run, but for the latter this effect is lagged and more persistent. Controlling for fiscal policy effects, the nominal (real) exchange rate depreciation seems to be expansionary for industrial output. For agriculture, a nominal exchange rate depreciation is restrictionary in the short run, with an expansionary effect in the long run (however, this result is not supported in specification with the real exchange rate). Several implications of fiscal policy effects are discussed.
    Źródło:
    Information Systems in Management; 2017, 6, 2; 131-142
    2084-5537
    2544-1728
    Pojawia się w:
    Information Systems in Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of price and income effects on Ukraine’s agricultural export growth
    Autorzy:
    Shevchuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/94757.pdf
    Data publikacji:
    2013
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    agricultural exports
    error-correction model
    exchange rate effects
    price and income effects
    eksport rolny
    model korekty błędów
    efekty kursowe
    Opis:
    Using monthly data for the 2001─2013 period, this paper applies Error- Correction Model (ECM) to estimate export demand effects for Ukraine’s agricultural commodities and foodstuffs. According to our results, the long-run exchange rate sensitivity of export demand seems to be rather weak, whereas the domestic income effect is high enough across all four groups: (i) meat, fish and dairy products; (ii) wheat and vegetables; (iii) vegetable oil and (iv) foodstuffs. No evidence is found of the long-term relationship between agricultural exports and foreign trade-partner industrial output. However, both exchange rate and foreign output are established to strongly affect the demand for agricultural exports in the short-run. Also, there is evidence of a speedy short-run adjustment for all groups of agricultural exports to their long-run relationships.
    Źródło:
    Information Systems in Management; 2013, 2, 3; 214-226
    2084-5537
    2544-1728
    Pojawia się w:
    Information Systems in Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizacija rezhima izmenenija vyleta bashennogo krana s sharnirno-sochlenennojj strelobojj sistemojj po ehnergeticheskomu kriteriju
    Optimization of lufing articulated jib of tower crane by energetic criteria
    Autorzy:
    Lovejjkin, V.
    Shevchuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/78046.pdf
    Data publikacji:
    2014
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    tower crane
    Euler-Puasson equation
    energy consumption
    angular velocity
    acceleration
    dynamic model
    Źródło:
    Motrol. Motoryzacja i Energetyka Rolnictwa; 2014, 16, 3
    1730-8658
    Pojawia się w:
    Motrol. Motoryzacja i Energetyka Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technique of designing of releasable threaded connections of autotractor technics
    Autorzy:
    Kuzmin, A.
    Shevchuk, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/244187.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    thread joints of tractors
    designing
    fatigue damages
    accelerated tests
    special thread
    Opis:
    The analysis of work of joints of tractors of models DT-YT allows to make the conclusion about presence of breakages because of low constructive strength and not correct definition of parameters of details. Probes of breakages of joints shows that today at designing of joints there is no system of the account of a mode of behavior and joint life cycle. Designing of threaded connections of automobile and tractor technics should be carried out taking into account modes and duration of operation of the car on these modes. Designing of threaded connections is carried out taking into account operation and life cycle modes. It is offered to carry out calculation taking into account accumulation of fatigue damages to a current of set time of operation. For definition of parameters of fatigue strength the technique of the accelerated tests is offered. The technique allows to define parameters of fatigue strength which it is necessary to use in calculations threaded connections. In work probes of a tension of joint of a driving wheel of a Caterpillar, are resulted by a method of the is finitely-element analysis. For probes settlement models are offered and tested. Settlement models allow to simplify construction of geometrical model for use in computer programs and calculations. Using the described technique of designing it is developed construction a retainer screw with a special thread.
    Źródło:
    Journal of KONES; 2009, 16, 1; 297-306
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current state and near-term prospects for development of the transport logistics market in Ukraine
    Autorzy:
    Karpenko, O.
    Kovalchuk, S.
    Kuzmych, V.
    Gorpyniuk, A.
    Shevchuk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2140809.pdf
    Data publikacji:
    2017
    Wydawca:
    Fundacja Centrum Badań Socjologicznych
    Tematy:
    transport services
    road transport
    rail transport
    air transport
    water transport
    Opis:
    The article has studied the current state of the transport services market in Ukraine, characterized features of the favorable geopolitical position of the country, identified segments of the market of transport and logistics services in Ukraine, made an analysis of the dynamics of freight transportation by land transport, determined its capacity in money terms and calculated the component share of this type of activity in the country’s GDP.
    Źródło:
    Journal of Sustainable Development of Transport and Logistics; 2017, 2, 1; 51-60
    2520-2979
    Pojawia się w:
    Journal of Sustainable Development of Transport and Logistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of thermomechanical processes in disc brakes of wheeled vehicles
    Autorzy:
    Hrevtsev, O.
    Selivanova, N.
    Popovych, P.
    Poberezhny, L.
    Sakhno, V.
    Shevchuk, O.
    Poberezhna, L.
    Murovanyi, I.
    Hrytsanchuk, A.
    Romanyshyn, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818803.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    disc brake
    wheeled vehicle
    angular velocity
    thermodynamically reversible process
    centrifugal force
    time of relaxation
    isotropic elastic medium
    torsional moment
    hamulec tarczowy
    pojazd kołowy
    prędkość kątowa
    siła odśrodkowa
    izotropowy ośrodek sprężysty
    moment skręcający
    Opis:
    Purpose: Ensuring the required operational reliability of disc brakes by forecasting their technical condition taking into account thermomechanical processes. Design/methodology/approach: Differential equations of rotation of a rigid body around a fixed axis are solved, it is established that the equations of motion and the equations of thermal conductivity are indirectly related. The use of these analytical dependences provides a better understanding of thermomechanical transients. Findings: The solution is obtained on the basis of the differential equation of thermal conductivity of the hyperbolic type, which does not allow an infinite velocity of propagation of temperature perturbations in contrast to the differential equation of thermal conductivity of the parabolic Fourier type. The obtained analytical dependences provide a better understanding of thermomechanical transients and develop a theoretical basis for determining stresses and heat fluxes in solving problems of reliability and durability of disc brakes. Research limitations/implications: The work uses generally accepted assumptions and limitations for thermomechanical calculations. Practical implications: It is shown, that transients in a mechanical system - a brake disk at impulse loadings cause emergence of thermal effects which arise under the influence of external loadings. Originality/value: The application of these analytical dependences provides a better understanding of thermomechanical transients and develops a theoretical basis for solving problems of reliability and durability of disc brakes.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2021, 104, 1; 11--20
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress-strain state simulation of non-uniformly heated elements of components and assemblies of automotive
    Autorzy:
    Hrevtsev, O.
    Selivanova, N.
    Popovych, P.
    Poberezhny, L.
    Brych, V. Ya.
    Rudyak, Yu.
    Shevchuk, O.
    Bakulina, N.
    Rozum, R.
    Buriak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201070.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    mathematical model
    elasticity theory
    axisymmetric problems
    critical infrastructure
    metal structures
    stress-strain state
    displacement functions
    thermal deformation
    thermodynamically inverse process
    cylinder
    finite length
    thickness
    model matematyczny
    teoria sprężystości
    symetria osiowa
    infrastruktura krytyczna
    konstrukcje metalowe
    stan naprężeń i odkształceń
    odkształcenie termiczne
    proces termodynamiczny
    proces odwracalny
    skończona długość
    grubość
    Opis:
    Purpose Develop a method for determining and evaluating the stress-strain state, particularly the distribution of thermomechanical stresses in the materials of individual rotating parts of vehicles. Design/methodology/approach The proposed method is based on the principle of gradual approximations of the solution when the boundary conditions are satisfied on the curvilinear limiting surfaces of the disk body. Findings The proposed method of determining and estimating the distribution of thermomechanical stresses in the disk material makes it possible to take into account the variable geometry: thickness and presence of a hole in the central part of the disk, also correctly determine stress-strain state at any point of unevenly heated rotating axial body. Research limitations/implications The work uses generally accepted assumptions and limitations for thermomechanical calculations. Originality/value It is proved that in real disks, the stress-strain state is spatial, and the well - known method based on the hypotheses of the plane-stress state does not provide the possibility of calculating the values of stresses in the thickness of the disk. The obtained results can be used to improve the methodology of auto technical examination of road accidents. In addition, they can be taken into account by bus drivers on urban routes when choosing a safe distance in heavy traffic, as well as design engineers of car brake systems.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2022, 115, 1; 26--32
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical simulation of the stress state of an erosion-worn tee of the main gas pipeline
    Autorzy:
    Doroshenko, Ya.
    Zapukhliak, V.
    Grudz, Ya.
    Poberezhny, L.
    Hrytsanchuk, A.
    Popovych, P.
    Shevchuk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1818501.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    multiphase flow
    gas-dynamic process
    erosion wear
    residual life
    temperature difference
    erosion defect
    allowable wall thickness
    przepływ wielofazowy
    proces gazodynamiczny
    zużycie erozyjne
    trwałość resztkowa
    różnica temperatur
    wada erozji
    Opis:
    Purpose: To investigate the strength of tees with regard to their erosion wear, it is necessary to consider the complex three-dimensional geometric shape of the erosion worn inner surface of the tee. In addition, the study of the strength of the erosion worn tees of the main gas pipelines is complicated by the occurrence of additional stresses caused by changes in the direction of movement of the gas stream, resulting in an uneven pressure distribution in the inner cavity of the tee, and the temperature difference in its walls. Design/methodology/approach: Methodology for complex numerical three-dimensional simulation of the stressed state of tees of the main gas pipelines, taking into account the gas-dynamic processes that occur in the places of these defects, erosion wear of the tee wall, temperature difference in the tee walls. Findings: The acceptable parameters of erosion defects of tees of gas pipelines, and residual life of tees with erosion defects of the wall should be determined. Research limitations/implications: The developed model does not take into account internal corrosion and corrosion products as an additional erosion factor. Further studies plan to develop a model of corrosion-erosion wear of pipeline elements. Practical implications: The developed technique allows determining the location of erosion defects, estimating the strength and determining the residual life of tees with erosion wear of the wall in order to ensure their reliability, to rank such defects according to the degree of danger, to determine which of them are critical and need an immediate repair. Originality/value: Based on the gas-dynamic processes occurring in the internal cavity of the main gas pipelines’ tees, the complex three-dimensional geometric form of wall erosion defects, and temperature difference, the technique of three-dimensional simulation of stress state of the main gas pipelines’ tees is developed
    Źródło:
    Archives of Materials Science and Engineering; 2020, 101, 2; 63--78
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-13 z 13

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