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    Wyświetlanie 1-9 z 9
    Tytuł:
    Vickers Hardness and Positron Annihilation Study of Eurofer97 and ODS Eurofer
    Autorzy:
    Bartošová, I.
    Čížek, J.
    Lukáč, F.
    Slugeň, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196045.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    28.52.Fa
    Opis:
    This paper describes investigations of Eurofer97 and oxide dispersion strengthened version of this steel, in as received state and after annealing. Vickers hardness test was performed on the as received specimens and after annealing at various temperatures to obtain information about development of the strength of studied materials. After identifying the temperature region where significant changes of the strength take place we applied positron annihilation spectroscopy to probe the microstructural changes in ferritic/martensitic steels. An observation of phase transformation was observed in both steels at various temperatures indicating different behaviour of the base material and its strengthened version. All applied methods proved the importance of strengthening by oxides to improve properties of steels.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 702-705
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defects Studies of ZnO Single Crystals Prepared by Various Techniques
    Autorzy:
    Lukáč, F.
    Čížek, J.
    Procházka, I.
    Melikhova, O.
    Anwand, W.
    Brauer, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196118.pdf
    Data publikacji:
    2014-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    61.72.J-
    Opis:
    The aim of the present work was a comparison of defects in ZnO crystals grown by various techniques available nowadays, namely hydrothermal growth, pressurized melt, Bridgman method growth and vapor phase growth. Positron annihilation spectroscopy was employed as a principal tool for characterization of defects in ZnO crystals grown by above mentioned various techniques. ZnO crystals can be divided into two groups: (i) hydrothermal grown crystals, which exhibit positron lifetime of 179-182 ps and (ii) ZnO crystals grown by the other techniques (pressurized melt, Bridgman method, vapor phase growth) which are characterized by the lower lifetimes falling in the range of 160-173 ps. Comparison of experimental data with ab initio theoretical calculations revealed that HT grown ZnO crystals contains Zn vacancies associated with hydrogen atom in a bond-centered site. On the other hand, ZnO crystals prepared by other techniques contain most probably stacking faults created by stresses induced by temperature gradients in the melt.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 3; 748-751
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of Defects in Titanium Created by Hydrogen Charging
    Autorzy:
    Hruška, P.
    Čížek, J.
    Knapp, J.
    Melikhova, O.
    Havela, L.
    Mašková, S.
    Lukáč, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033958.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    61.72.-y
    Opis:
    Hydrogen interaction with vacancies in α-Ti was investigated employing positron lifetime spectroscopy combined with ab initio theoretical modeling of vacancy-hydrogen complexes. Ab initio modeling revealed that multiple hydrogen atoms up to 7 can be trapped at vacancies in the α-Ti lattice. Trapped H atoms are located close to the nearest neighbor tetrahedral sites around the centre of vacancy. Lifetimes of positrons trapped at vacancies associated with various numbers of hydrogen atoms were calculated. Positron lifetime measurement of H-loaded α-Ti samples revealed that phase transition into the hydride phase introduced dislocations. Vacancies were created by H loading as well and agglomerated into small vacancy clusters.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1606-1610
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positronium Probing of Pores in Zirconia Nanopowders
    Autorzy:
    Prochazka, I.
    Cizek, J.
    Lukac, F.
    Melikhova, O.
    Hruska, P.
    Anwand, W.
    Liedke, M.
    Konstantinova, T.
    Danilenko, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033930.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Wx
    61.46.Hk
    78.70.Bj
    Opis:
    In the present paper, conventional positron lifetime measurements on selected zirconia-based nanopowders are reported. The nanopowders were doped with various metal cations (Y³⁺, Eu³⁺, Gd³⁺, Lu³⁺ and Mg²⁺). Lifetime experiments were conducted in air and supplemented with mass density measurements. In a range of lifetimes, from a few ns to ≈70 ns, up to two individual lifetime components could be identified. Such observations confirmed positronium (Ps) formation with subsequent ortho-Ps pick-off annihilation as well as the occurrence of pores of different size. Pore sizes were estimated using a shape-free model of the correlation between pore size and ortho-Ps lifetime. The origins of pores are discussed on the basis of the ortho-Ps data in combination with the results of mass density measurements.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1564-1567
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Weighing systems in traffic
    Autorzy:
    Bisták, M.
    Brumerčík, F.
    Lukáč, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/197642.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    axle scale
    dynamic weighing system
    load cell vehicle
    skala osi
    dynamiczny system ważenia
    pojazd z ogniwami obciążnymi
    Opis:
    This article presents a brief overview of weighing systems and devices designed to facilitate fluent and safe road traffic. The number of vehicles on roads is perpetually on the rise, resulting in increased wear of road surfaces. This is why weight check gates have widely been implemented to check the speed and weight of a vehicle against what is permitted by law. A cheaper, albeit more time-consuming, traffic weighing alternative would involve weighing points using weighbridges or mobile axle scales. The second part of this article examines the development of an axle scale. The design and calculation works were performed with the use of the Creo Parametric CAD system and the ANSYS Workbench FEM system.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2017, 97; 5-15
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of Roller Bearing
    Autorzy:
    Kohár, R.
    Brumerčík, F.
    Lukáč, M.
    Nieoczym, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/117746.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    tapered roller bearings
    dynamic simulation
    axial load force
    Opis:
    The aim of this paper is to detail the creation of a large tapered roller bearing model with flexible body cages in the Adams program suite for subsequent dynamic analysis and to obtain information about kinematic and dynamic relationships of steel and plastic cages under various operating conditions. The bearing model was made to closely resemble its real-life counterpart, which allows us to estimate load conditions, dynamic conditions of individual bearing parts and interactions between them.
    Źródło:
    Applied Computer Science; 2016, 12, 1; 5-16
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of roller bearing cages
    Autorzy:
    Kohar, R.
    Krzysiak, Z.
    Lukac, M.
    Brumercik, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/132167.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    computer simulation
    dynamic analysis
    mathematical models
    roller bearings
    Opis:
    The aim of this paper is to detail the creation of a roller bearing model with flexible body cages in the Adams program suite for subsequent dynamic analysis and to obtain information about kinematic and dynamic relationships of steel and plastic cages under various operating conditions. The bearing model was made to closely resemble its real-life counterpart, which allows us to estimate load conditions, dynamic conditions of individual bearing parts and interactions between them.
    Źródło:
    Advanced Technologies in Mechanics; 2016, 3, no. 2 (7); 2-11
    2392-0327
    Pojawia się w:
    Advanced Technologies in Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling of Flow and Temperature Field in an Economizer
    Autorzy:
    Brumerčík, F.
    Sojcak, D.
    Lukáč, M.
    Nieoczym, A.
    Wierzbicki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/117888.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Promocji Wiedzy
    Tematy:
    economizer
    main part of boiler
    modelling
    CFD
    Opis:
    This article deals with the economizer as one of the main parts of a boiler. Economizers and air heaters perform a key function in providing high overall boiler thermal efficiency by recovering the low level energy from the flue gas before it is exhausted to the atmosphere. The most common and reliable economizer design is the bare-tube, in-line, cross-flow type. To reduce capital costs, most boiler manufacturers build economizers with a variety of designs to enhance the controlling gas-side heat transfer rate. From this point of view it creates a lack for an investigation and modeling of these parts.
    Źródło:
    Applied Computer Science; 2016, 12, 2; 63-73
    1895-3735
    Pojawia się w:
    Applied Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Teeth geometry and contact pressure calculation of external cycloidal gears
    Autorzy:
    Brumercik, F.
    Lukac, M.
    Majchrak, M.
    Krzysiak, Z.
    Krzywonos, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/197154.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    gear
    geometry
    contact pressure
    cycloid
    convex-concave
    koło zębate
    geometria
    ciśnienie kontaktowe
    cykloida
    Opis:
    Cycloidal (also called epicyclical or convex-concave) gears are used less often than common involute gears, which are very easy to manufacture and can be modified by corrections to the gear profile. Cycloidal gears are very sensitive to the proper axial distance between the pinion and the gear. The main advantage of convex-concave gears is the lowering of the contact pressure due to teeth flanks meshing and also the lowering of the slide ratios compared to involute gears. The calculation of the selected geometrical parameters and the contact pressure between the teeth flanks of the cycloidal gearing is described in the presented article.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 101; 27-35
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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