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    Wyświetlanie 1-5 z 5
    Tytuł:
    Identification of sandstone-related rocks composition using the X-ray analysis
    Autorzy:
    Kosuth, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/344037.pdf
    Data publikacji:
    2013
    Wydawca:
    nakł. Maciej Pawlikowski
    Tematy:
    X-ray analysis
    mineral composition
    sandstones
    siltstones
    calcite
    dolomite
    Opis:
    The article presents knowledge based on investigation of sandstones or siltstones composition from the Paleogene flysch terrains in North-East Slovakia. Samples of frequently crumbling clastic rocks were commonly considered to be close to sandstones, composed by predominant quartz. The set of such samples, belonging to Dukla Unit Sandstones were analyzed using the XRD analyses. Beside of quartz the diffraction patterns gave the evidence in significant carbonate share with some minor to minute feldspars, mica and chlorite contents. Among majority of analyzed samples we distinguish three groups of sandstones: (1) with the abundant calcite admixture, (2) the sandstones which contain meaning dolomite portion. The group (3) is representing the samples is formed the same by quartz as by both of carbonates, each of them could form important up to prevailed mineral component. Comparison of analyzed samples mineral composition shows remarkable trend of higher calcite and dolomite contents in younger clastic sediments.
    Źródło:
    Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering; 2013, 16; 1-7
    1689-6742
    Pojawia się w:
    Auxiliary Sciences in Archaeology, Preservation of Relics and Environmental Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure, physical properties and fractal character of surface topography of CVD coatings
    Autorzy:
    Kwaśny, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/100107.pdf
    Data publikacji:
    2011
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    CVD coatings
    fractal geometry
    multifractal geometry
    X-ray analysis
    Opis:
    The aim of the presented study is to establish a methodology elaboration, giving a possibility to predict properties of coatings reached in CVD process on tool materials, based on fractal quantities describing their surface. Coatings' topography and its structure which has an impact on a shape of analysed objects' surface were characterised in a comprehensive way. Influence of a type of process and conditions of deposition over structure and shape of topography as well as mechanical and operational properties of the acquired coatings were determined.
    Źródło:
    Journal of Machine Engineering; 2011, 11, No. 1-2; 134-151
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Ceramic Coating on Mechanical Properties of Stainless Steel
    Autorzy:
    Czekaj, D.
    Lisińska-Czekaj, A.
    Krzysztofowicz, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/353220.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stainless steel
    X-ray analysis
    microhardness
    sol-gel ceramic coating
    Opis:
    Crystal structure and phase composition of stainless steel substrates (AISI 304 type) was studied and it was found that they adopted the cubic symmetry. The calculated elementary cell parameter for the mayor Fe-Ni phase (weight fraction 99%) was a = 3.593 Å, whereas the mean grain size was = 2932 Å. Morphology of the stainless steel substrate surface was studied with profilometry. Mechanical properties of the stainless steel substrates and stainless steel substrates coated with ceramic layer of barium strontium titanate were studied with microhardness tester. For measurements performed according to the Vickers method the average microhardness was found HV = 189 or HV = 186 for the “in-line” and “mapping” measurement pattern, respectively. The sol-gel method was used to coat the surface of the stainless steel substrate with a thin ceramic layer of the chemical composition Ba0.6 Sr0.4 TiO3 . It was found that the stainless steel substrate covered with sol-gel deposited ceramic coating exhibited the average hardness within the range HV = 217 up to HV = 235 for loading force F = 98 mN and F = 0.98 N, respectively. The Knopp method was also used and it was found that the stainless steel substrate with Ba0.6 Sr0.4 TiO3 coating exhibited hardness HK = 386.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 911-916
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    N-N Bond Lengths and Initiation Reactivity of Nitramines
    Autorzy:
    Zeman, Svatopluk
    Atalar, Taner
    Růžička, Aleš
    Powiązania:
    https://bibliotekanauki.pl/articles/358441.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    bond length
    impact sensitivity
    nitramines
    reactivity
    thermal decomposition
    X-ray analysis
    Opis:
    For the 16 selected nitramines, it is shown that an increase in the energy content of these molecules (represented by enthalpies of formation) is connected with an increase in the lengths of the longest N–N bonds in the molecules. These lengths are directly proportional to the activation energies of the low-temperature thermal decomposition of the pure nitramines in all states of matter for this reaction. Raising the energy content also leads to reductions in the rate constants of thermal decomposition. Both of these facts are in contrast to expectations and also with similar published findings concerning thermal decomposition of nitramines in solution, which can be explained by the solvation effect and termination of the emerging aza-radicals in solutions. The calculated dissociation energies of the weakest N–N bonds yielded a relatively good reciprocal conformity with the lengths of the longest N–N bonds of the nitramines studied, especially when using the UB3LYP/6-31G* method. The relationship between the impact sensitivity of these nitramines and the lengths of their longest N–N bond is not completely clear. Such lengths cannot be a measure of impact reactivity, because the longest N–N bond might be stabilized in some cases by suitable intermolecular interactions with adjacent molecules in the crystal lattice.
    Źródło:
    Central European Journal of Energetic Materials; 2020, 17, 2; 169-200
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmiany struktury zaczynu cementowego pod wpływem roztworu powodującego dekalcyfikację
    Changes of the cement paste structure under decalcification
    Autorzy:
    Słomka-Słupik, B.
    Zybura, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/362852.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Fizyki Budowli Katarzyna i Piotr Klemm
    Tematy:
    dekalcyfikacja zaczynu cementowego
    chlorek amonu
    analiza rentgenowska
    SEM-BSE
    analiza obrazu
    decalcification of the cement paste
    ammonium chloride
    X-ray analysis
    image analysis
    Opis:
    Przedstawiono zmiany struktury zaczynu z cementu portlandzkiego zwykłego zachodzące wskutek działania chlorku amonu, który wchodzi w skład ścieków zakładów koksochemicznych. Działanie agresywne nasyconego roztworu NH4Cl trwało 25 dób. Badania rentgenowskie składu fazowego wskazały zanikanie portlandytu przy brzegu próbki. Wywołane ubytkiem portlandytu nieciągłości struktury określono na podstawie obserwacji zgładu w elektronowym mikroskopie skaningowym (SEM) oraz stosując metodę analizy obrazu.
    The changes of ordinary Portland cement paste structure caused by interaction with ammonium chloride solution, which is present in coke sewage, are described. The aggressive immersion of specimen lasted for 25 days into saturated solution of NH4Cl. The X-ray examinations of phase composition pointed at portlandite decrease and its disappearance at the edge of the specimen. Discontinuities of the cement paste matrix caused by the portlandite amount changes determined from the polished section observations into scanning electron microscope using backscattered electrons with application of image analysis.
    Źródło:
    Fizyka Budowli w Teorii i Praktyce; 2009, T. 4; 163-168
    1734-4891
    Pojawia się w:
    Fizyka Budowli w Teorii i Praktyce
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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