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    Wyświetlanie 1-7 z 7
    Tytuł:
    Drilling bits in percussive-rotary drilling technology (down the hole DTH)
    Autorzy:
    Śliwa, T.
    Śnieżek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/298928.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    drillbits
    down-the-hole (DTH) drilling
    Opis:
    This paper addresses the issue of drillbits for drilling normal and large diameter boreholes with the use of percussion-rotary method. The most important elements of drillbits, i.e. sintered carbide inserts of different shapes have been described. The hardness of the drilled rock determines the shape of used sintered carbide inserts and the shape of the drillbit face. The cluster hammers, used for drilling large diameter DTH, have been also presented.
    Źródło:
    AGH Drilling, Oil, Gas; 2012, 29, 4; 453-462
    2299-4157
    2300-7052
    Pojawia się w:
    AGH Drilling, Oil, Gas
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The role and position of iron in 0.8CaZrO3-0.2CaFe2O4
    Autorzy:
    Szczerba, J.
    Śnieżek, E.
    Stoch, P.
    Prorok, R.
    Jastrzębska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146129.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    calcium ferrite
    calcium zirconate
    Mössbauer spectroscopy
    perovskite
    spinel
    Opis:
    The aim of the study was to characterize the 0.8CaZrO3-0.2CaFe2O4 composite structure with particular emphasis on the role and position of iron in the function of sintering temperature. The paper presents the results of 57Fe Mössbauer effect at room temperature. It was found that the increase of sintering temperature causes an increase in the amount of incorporated iron ions in the CaZrO3-crystal structure. Based on Mössbauer spectroscopy analysis, it was found that three different environments of Fe3+ ions were observed in the obtained materials. Two of them corresponded to CaFe2O4 phase and one was associated with the substitution of Zr4+ by Fe3+ in the CaZrO3 structure.
    Źródło:
    Nukleonika; 2015, 60, 1; 147-150
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Position of Fe ions in MgO crystalline structure
    Autorzy:
    Szczerba, J.
    Prorok, R.
    Stoch, P.
    Śnieżek, E.
    Jastrzębska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146372.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Mössbauer spectroscopy
    MgO
    Fe ions
    crystal structure
    Opis:
    Magnesium oxide (MgO) is one of the most important raw materials in many branches of industry. Magnesium oxide is a popular refractory raw material because of its high refractoriness and high resistance to basic slags and environment. In many cases, use of MgO is limited by its properties, especially the presence of secondary phases like iron oxides. The amount and distribution of iron oxides can strongly infl uence the technological properties of MgO and depend on the manufacturing method, particularly the heat-treatment process. The aim of the study was to evaluate the infl uence of the heat-treatment process on amount and distribution of iron ions in a magnesium oxide lattice. The 57Fe Mössbauer effect measurements of fused and sintered magnesium oxide samples doped by the iron oxide were conducted. Investigation reveals in both cases the presence of Fe2+ as well as Fe3+ ions. Fe2+ ions occupy Mg2+ octahedral sites in the MgO lattice, whereas the Fe3+ ions are located in highly distorted octahedral coordination. The amount of Fe2+ varies from around 66% for fused samples to 30% for sintered samples.
    Źródło:
    Nukleonika; 2015, 60, 1; 143-145
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystal structure and Mössbauer study of FeAl2O4
    Autorzy:
    Jastrzębska, I.
    Szczerba, J.
    Stoch, P.
    Błachowski, A.
    Ruebenbauer, K.
    Prorok, R.
    Śnieżek, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/147676.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    FeAl2O4
    hercynite
    Mössbauer spectroscopy
    spinel
    Opis:
    In this work the synthesis of hercynite from Fe2O3 and Al2O3 powders was carried out by arc-melting method under the protective argon atmosphere. The obtained material was characterized with the use of powder X-ray diffractometry (XRD) and Mössbauer spectroscopy (MS). A Mössbauer effect in hercynite obtained by the arc-melting method indicated the cations distribution in the spinel structure among the tetrahedral and octahedral interstices. The presence of Fe2+ ions was detected in both tetrahedral and octahedral sites while Fe3+ ions occupied only the octahedral interstices. The approximate formula of the obtained iron-aluminate spinel was as follows (Fe2+ 0.77Al3+0.23)(Fe3+0.07Fe2+0.05Al0.88)2O4.
    Źródło:
    Nukleonika; 2015, 60, 1; 47-49
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low Temperature Processing of Nanostructures Based on II-VI Semiconductors Quantum Wells
    Autorzy:
    Majewicz, M.
    Śnieżek, D.
    Wojciechowski, T.
    Baran, E.
    Nowicki, P.
    Wojtowicz, T.
    Wróbel, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1376129.pdf
    Data publikacji:
    2014-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Ga
    73.63.Hs
    68.37.Hk
    62.23.St
    Opis:
    We report the first results of electron beam lithography processes performed on polymethyl methacrylate (PMMA) and hydrogen silsesquioxane (HSQ) resists, which have been pre-backed in vacuum at T ≤ 90°C. For such low temperature processing the lithographical resolution is reduced as compared to standard procedures, however, the exposure contrast and adhesion to CdTe and HgTe substrates have been sufficient for the fabrication of sub-μ m quantum devices. Furthermore, the new method of electrical microcontact forming is proposed, based on the local melting and annealing of an indium metal layer, performed with the application of accelerated electron beam. The method has been tested for CdTe/CdMgTe quantum wells using the lithography techniques, the exposure parameters have been optimized by inspecting the morphology of annealed metal film via the in situ imaging.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 5; 1174-1176
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical and Experimental Modeling of Plastic Deformation the Multi-Layer Ti/Al/Mg Materials
    Autorzy:
    Mróz, S.
    Stefanik, A.
    Szota, P.
    Kwapisz, M.
    Wachowski, M.
    Śnieżek, L.
    Gałka, A.
    Szulc, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/354174.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multi-layered Ti/Al/Mg material
    plastic deformation
    physical modelling
    numerical modelling
    Opis:
    The paper has presented the results of theoretical studies and experimental tests of the plastic deformation of multi-layered Ti/Al/Mg specimens. Theoretical studies were carried out using the Forge2011® computer program. Physical modeling, on the other hand, was performed using the Gleeble3800 simulator. Cuboidal specimens were cut off from the plates obtained in the explosive welding method. Based on the obtained investigation results it has been found non uniform deformation of the particular layer as a result their different value of flow stress.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1361-1368
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of the AA2519 Alloy Hot Rolling Process and Cladding with EN AW-1050A Alloy
    Autorzy:
    Płonka, B.
    Rajda, M.
    Zamkotowicz, Z.
    Żelechowski, J.
    Remsak, K.
    Korczak, P.
    Szymański, W.
    Snieżek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/355946.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al alloys
    rolling
    cladding
    mechanical properties
    structure
    Opis:
    The objective of the study was to determine the feasibility of plastic forming by hot rolling of the AA2519 aluminium alloy sheets and cladding these sheets with a layer of the EN AW-1050A alloy. Numerous hot-rolling tests were carried out on the slab ingots to define the parameters of the AA2519 alloy rolling process. It has been established that rolling of the AA2519 alloy should be carried out in the temperature range of 400-440°C. Depending on the required final thickness of the sheet metal, appropriate thickness of the EN AW-1050A alloy sheet, used as a cladding layer, was selected. As a next step, structure and mechanical properties of the resulting AA2519 alloy sheets clad with EN AW-1050A alloy was examined. The thickness of the coating layer was established at 0,3÷0,5mm. Studies covered alloy grain size and the core alloy-cladding material bond strength.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 381-388
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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