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    Wyświetlanie 1-7 z 7
    Tytuł:
    The Optimization of the system "price – quality" in shoes
    Autorzy:
    Popovych, N.
    Bednarchuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/412797.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Skórzanego
    Tematy:
    competition
    market
    shoes
    evaluation
    consumer properties
    konkurencja
    rynek
    buty
    ocena
    właściwość konsumpcyjna
    Opis:
    Elaborated a questionnaire, conducted organoleptic evaluation of quality shoes, which sold on the one of the largest in Western Ukraine shopping centers. On the basis of these researchs done Rankings respective store LLC “AJPIE-L”.
    Źródło:
    Technologia i Jakość Wyrobów; 2016, 61; 95-97
    2299-7989
    Pojawia się w:
    Technologia i Jakość Wyrobów
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the interaction of participants freight forwarding system
    Autorzy:
    Popovych, P.
    Shyriaieva, S.
    Selivanova, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2140660.pdf
    Data publikacji:
    2016
    Wydawca:
    Fundacja Centrum Badań Socjologicznych
    Tematy:
    freight forwarding system
    interaction of participants of the freight forwarding system
    processes into freight forwarding system
    Opis:
    Main goal of this work is the analysis of the interaction of participants of freight forwarding activities. Research methods included analysis of scientific literature, theory of systems and systems analysis, methods of induction and deduction. As sources of information used and applied work of fundamental importance known foreign and local scientists and regulatory and legislative documents of Ukraine for the state transport policy. In the article the basic interactions of participants of freight forwarding activities. Classified components freight forwarding services. Assign the concept freight forwarding system and its aim. Established element and forms of cooperation in the freight forwarding system. The main task of forwarding companies are organizing, coordinating and ensuring the delivery from shipper to consignee. Freight forwarding company responsible for the timely delivery of the goods on the condition of preservation of the quantity and quality specified time conditions. Currently used methods are uneffective decision-making, leading to losses. These circumstances require improvement methodology management of freight forwarding companies. This is possible only using modern mathematical methods and information technologies that will improve the operation of freight forwarding companies. The article presents a theoretical exposition of the basic processes of interaction between participants in freight forwarding system. The article may be of interest to specialists of freight forwarding companies.
    Źródło:
    Journal of Sustainable Development of Transport and Logistics; 2016, 1, 1; 16-22
    2520-2979
    Pojawia się w:
    Journal of Sustainable Development of Transport and Logistics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ferromagnetic Resonance in CdTe:Cr Single Crystals Containing Dopant-Related Macrodefects
    Autorzy:
    Popovych, V.D.
    Kuzma, M.
    Skop, N.
    Stefaniuk, I.
    Cieniek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030219.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.-y
    68.37.Hk
    76.50.+g
    Opis:
    We study CdTe:Cr single crystals grown by the physical vapor transport method from pre-synthesized (Cd,Cr)Te alloys with 5 at.% of chromium nominal content. Macrodefects in the form of (111)-oriented thin platelets of dopant-related second phases were detected by scanning electron microscopy patterning of the chemically treated surfaces of the crystals. Magnetic properties of the crystals were investigated by ferromagnetic resonance using X-band Bruker spectrometer (9.43 GHz). Their ferromagnetic resonance spectra show several broad lines, which position depends on the orientation of the sample in relation to the external magnetic field in spectrometer. The angular dependences of ferromagnetic resonance spectra are interpreted in the frame of shape anisotropy of ferromagnetic resonance of the planar defects embedded in a weak magnetic CdTe matrix.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 34-38
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    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:
    Evaluation of stress-strain state of vehicles’ metal structures elements
    Autorzy:
    Hrevtsev, O.
    Selivanova, N.
    Popovych, P.
    Poberezhny, L.
    Rudyak, Yu.
    Shevchuk, O.
    Poberezhna, L.
    Ivanova, A.
    Skyba, O.
    Shashkevych, O.
    Hrytsanchuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2201126.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    thermomechanical stress
    disk brakes durability
    stress and strain state
    vehicle reliability
    braking distance
    naprężenia termomechaniczne
    trwałość hamulców tarczowych
    stan naprężenia i odkształcenia
    niezawodność pojazdu
    droga hamowania
    Opis:
    Purpose: Develop a method for determining and evaluating the stress-strain state, in particular 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 as a basis for improving the methodology of auto technical examination of road accidents. In addition, they can be taken into account by design engineers of car brake systems.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 113, 2; 77--85
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and electrical properties of highly doped ZnO:Al films deposited by atomic layer deposition on Si substrates in visible and near infrared region
    Autorzy:
    Romanyuk, V.
    Dmitruk, N.
    Karpyna, V.
    Lashkarev, G.
    Popovych, V.
    Dranchuk, M.
    Pietruszka, R.
    Godlewski, M.
    Dovbeshko, G.
    Timofeeva, I.
    Kondratenko, O.
    Taborska,, M.
    Ievtushenko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1156366.pdf
    Data publikacji:
    2016-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.Hf
    73.61.Ga
    Opis:
    Optical properties of ZnO films doped by Al in the range 0.5 to 7 at.% and deposited by atomic layer deposition were studied in visible and infrared spectral range. Spectral dependences of film optical permittivity were modeled with the Lorentz-Drude approximation resulting in ZnO:Al plasma frequency and plasma damping parameters. We observed changing electron effective mass from 0.29m₀ to 0.5m₀ with increasing electron concentration in the range (0.9-4) × 10²⁰ due to the phenomenon of conduction band non-parabolicity. Comparing the results of optical and electrical investigations we can see that the main scattering mechanism is the scattering on grain boundaries (its contribution is about 60%).
    Źródło:
    Acta Physica Polonica A; 2016, 129, 1a; A-36-A-40
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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