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    Wyświetlanie 1-5 z 5
    Tytuł:
    Influence of plastic deformation carbon steel on the process of burning electric arc
    Autorzy:
    Vakulenko, Igor Alex
    Plitchenko, Sergey
    Kurt, Bulent
    Askerov, Hangardas
    Proydak, Svetlana
    Erdogdu, Ahmet Emrah
    Powiązania:
    https://bibliotekanauki.pl/articles/2091226.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    substructure
    density dislocation
    electric current
    plastic deformation
    cementite
    ferrite
    podbudowa
    dyslokacja gęstości
    prąd elektryczny
    deformacja plastyczna
    cementyt
    ferryt
    Opis:
    During a study of the combustion process of a direct polarity electric arc, a directly proportional dependence of the electric current value on the degree of cold plastic deformation of carbon steel used as an electrode was found. To calculate the value of the electric current during arc burning, in the indicated ratio, it was proposed to replace the surface tension force of the liquid metal with the surface tension of ferrite of plastically deformed carbon steel. Calculation of the ferrite’s surface tension value on the deformation degree of the steel under study through the size of the coherent scattering regions was used to explain the observed dependence of the electric current during arc burning. From the analysis of the considered correlation ratios, it was found that with an increase in the cold deformation degree, the refinement of the coherent scattering regions results in the ferrite’s surface tension increase and consequently, to an increase in the electric current during arc burning. Comparative analysis of the obtained results of calculating the value of electric current during arc burning through the surface tension of ferrite of cold-deformed carbon steel showed a fairly good coincidence with experimental data. The differences did not exceed 9%.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 112; 211--218
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transformation of structure during friction stir welding
    Autorzy:
    Vakulenko, Igor Alex
    Plitchenko, Sergey
    Kurt, Bulent
    Proydak, Svetlana
    Askerov, Hangardas
    Powiązania:
    https://bibliotekanauki.pl/articles/2134872.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    chemical compound
    grain size
    hardness
    recrystallisation
    temperature
    związek chemiczny
    wielkość ziarna
    twardość
    rekrystalizacja
    temperatura
    Opis:
    In comparison with low carbon steels, there is increased interest in the use of aluminium-based alloys as materials for the manufacture of welded structures rolling stock of railway transport. During friction stir welding aluminium-based alloy, against the background of the analysis structural transformations, issues of development hardening processes are considered. Under conditions of existence, a temperature gradient at zone of weld formation, shown degree approximation alloy to the conditions of superplastic flow and influence from presence particles of the second phase on grain size of matrix is estimated. Evaluation of the separate influence grain size of matrix and state of solid solution at total hardness of the weld showed dependence of their contributions on temperature of hot plastic deformation. As the temperature of plastic deformation of alloy at area of the weld increases, contribution to the total hardness from grain size increase and on state of the solid solution decreases.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 111; 181--191
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of the international multimodal container transportation
    Autorzy:
    Nekhoroshkov, Vladimir
    Vakulenko, Sergey
    Kurenkov, Peter
    Nekhoroshkov, Evgeniy
    Deruzhinskiy, Grigoriy
    Ignatenko, Alexander
    Aroshidze, Alyona
    Astafiev, Alexey
    Seryapova, Irina
    Solskaya, Irina
    Powiązania:
    https://bibliotekanauki.pl/articles/2173481.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    development
    cargo
    international transportation
    Eurasian Economic Union
    social significance
    market transformation
    international multimodal container transportation
    transport market
    rozwój
    ładunek
    transport międzynarodowy
    Euroazjatycka Unia Gospodarcza
    znaczenie społeczne
    przekształcenia rynku
    międzynarodowe multimodalne przewozy kontenerowe
    rynek transportowy
    Opis:
    . The development of international cargo transportation has been relevant since the emergence of the international division of labor. Billions of tons of goods of various names, values and volumes are transported across the borders of the Russian Federation every year. This paper examines the Eurasian Economic Union international transportation system, its transport system integration, and the formation of a common transport space. The authors analyzed the international transport market state and conditions and the level of containerization. The transport system is considered the country's economy "circulatory system", which makes it a key link in the implementation of economic reforms in the country. The transport industry has social significance, which also determines the specifics of the phased market transformations. The development of international multimodal container transportation is becoming a new trend in the development of the transport service market.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2022, 114; 103--114
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of a Low-Frequency Musical Fragment on the Neural Oscillations
    Autorzy:
    Drozdenko, Kateryna
    Naida, Sergey
    Drozdenko, Oleksandr
    Damarad, Anastasiia
    Pareniuk, Dmytro
    Vakulenko, Liudmyla
    Adaricheva, Zhanna
    Powiązania:
    https://bibliotekanauki.pl/articles/2141638.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electroencephalogram
    brain rhythms
    music therapy
    acoustic influences
    bioelectrical activity
    spectral analysis
    Opis:
    Study of musical-acoustic influences, which are used to improve the functional state of a person, as well as her/his neurophysiological or psychological rehabilitation, is very relevant nowadays. It is related with a large number of conflict situations, significant psychological and informational overloads of modern human, permanent stress due to the pandemic, economic crisis, natural and man-made disasters. This work examines the effect of listening to low-frequency music on the percentage of alpha, beta, delta, and theta waves in the total spectral power of the electroencephalogram in the frequency band 0.5–30 Hz. To obtain rhythms of the brain the spectral analysis of filtered native electroencephalogram was used. For statistical analysis of neural oscillations the Student’s t-test and the sign test were implemented with usage of the Lilliefors normality criterion and the Shapiro-Wilk test. Statistically significant differences were identified in alpha, theta and delta oscillations. For the beta rhythm presented music did not play any significant role. An increase in the activity of the alpha rhythm in the temporal (for 2.20 percentage point), central (for 1.51 percentage point), parietal (for 2.70 percentage point), occipital (for 2.22 percentage point) leads of the right hemisphere and the parietal (for 1.74 percentage point) and occipital (for 2.46 percentage point) leads of the left hemisphere and also of the theta rhythm in the temporal leads of the left hemisphere (for 1.13 percentage point) were observed. The downfall of delta rhythm in the frontal lead of the left hemisphere (for 1.51 percentage point) and occipital in both hemispheres (for 1.64 and 1.33 percentage points respectively in the left and right hemispheres) was detected. These may indicate that listening to low-frequency compositions helps to restore the brain in physiological conditions at different functional overload levels, decrease the level of emotional tone, and promote relaxation.
    Źródło:
    Archives of Acoustics; 2022, 47, 2; 169-179
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence hot plastic deformation on the structure and properties of carbon steel of the railway wheel
    Autorzy:
    Vakulenko, Igor
    Plitchenko, Sergey
    Bolotova, Dariy
    Asgarov, Khangardash
    Powiązania:
    https://bibliotekanauki.pl/articles/27312350.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    railway wheel
    carbon steel
    mechanical properties
    hot deformation
    boundary
    austenite
    koło kolejowe
    stal węglowa
    właściwości mechaniczne
    odkształcenie na gorąco
    granica
    austenit
    Opis:
    The study is devoted to the explanation of the influence of hot plastic deformation on the properties of railway wheels. The shape of individual elements of the wheel provides for a different degree of hot compression, which determines the mechanism for the development of the recrystallization at austenite. With a decrease in the degree of the hot deformation, a certain proportion of grains with a low energy of linear stretching are formed in austenite. As a result, of the low mobility of such boundaries, the likelihood of preservation of part of the substructural state of the austenite increases, which should affect the formation of a colony of perlite during the cooling of the carbon steel. Against background preservation and a dependence of strength properties on the dispersion of the pearlite colony, the appearance in austenite of grain boundaries with a low energy of linear tension leads to a qualitative change in the plastic properties of railway wheel steel. The increase in plasticity of carbon steel with an increase in dispersion of the pearlite colony is due to a decrease in the effect of solid solution hardening and an increase in the role of the ferrite-cementite interface in the development processes of strain hardening carbon steel. The results obtained can be useful for improving the technology of manufacturing all-rolled railway wheels.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2023, 121; 257--266
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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