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    Wyświetlanie 1-4 z 4
    Tytuł:
    Analysis of operating states of haul trucks used in surface mining
    Autorzy:
    Bodziony, P.
    Patyk, M.
    Kasztelewicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/949490.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    surface mining
    haul truck
    fault modes
    effect analysis
    operating states
    Opis:
    Mining transport system based on the use of haul trucks should result from thorough analysis of technical and operating issues – which can have a crucial impact on the cost of minerals extraction. This selection should consider hitherto disregarded criteria, such as technical infallibility, operating parameters like mean operating time between failures (MTBF), mean failure intensity and fault modes and effect analysis etc. Considering the above issues, the following article is an attempt to analyse operating parameters of transport fleet of haul trucks for mineral resource in surface mining. Diagram of the typology of technical and operational haul truck states; source: own study; mean failure intensity graph and mean failure intensity graph for the total observation time; relationships between mean expected time between consecutive failures of specific object and (MTBF) mean value of the time, in which specific equipment is in the down time due to a failure are presented in the article. The MTBF index is a basic parameter helpful to determine dependability and can be used for logistic planning, in particular in the field of spare parts. This index allows determining the cost of object use throughout its entire life cycle.
    Źródło:
    Journal of KONES; 2018, 25, 2; 53-58
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Criteria for the minimum operation length of internal forces as a function of the development of an optimum structure of machinery structural components
    Autorzy:
    Fligiel, M.
    Patyk, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/266193.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    siła wewnętrzna
    optymalizacja topologiczna
    kryteria optymalizacji
    optimization criteria
    topological optimization
    operation length of internal forces
    Opis:
    The present study analyzes the operation length of internal forces (DDSW) understood as the length of the flow of internal forces along the shortest possible internal routes. The operation length of internal forces is determined on the basis of stresses and the given volume in the constructional space. The minimum DDSW of the structure satisfies the criterial conditions of the most rigid structure, where the potential energy of deformation and the deformation energy potential is the same in the whole volume and thus the potential gradient is zero.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 4; 997-1005
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Weakly connected domination critical graphs
    Autorzy:
    Lemańska, M.
    Patyk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/255051.pdf
    Data publikacji:
    2008
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    weakly connected domination number
    tree
    critical graphs
    Opis:
    A dominating set D ⊂ V(G) is a weakly connected dominating set in G if the subgraph G[D]w = (NG[D], Ew) weakly induced by D is connected, where Ew is the set of all edges with at least one vertex in D. The weakly connected domination number ϒw(G) of a graph G is the minimum cardinality among all weakly connected dominating sets in G. The graph is said to be weakly connected domination critical (ϒw-critical) if for each u, v ∈ V(G) with v not adjacent to u, ϒw(G + vu) < ϒw(G). Further, G is k- ϒw-critical if ϒw(G) = k and for each edge e ∉ E(G), ϒw(G + e) < k. In this paper we consider weakly connected domination critical graphs and give some properties of 3-ϒw,-critical graphs.
    Źródło:
    Opuscula Mathematica; 2008, 28, 3; 325-330
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silicon Carbide Nanowires Synthesis and Preliminary Investigations
    Autorzy:
    Patyk, J.
    Rich, R.
    Wieligór, M.
    Żerda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536454.pdf
    Data publikacji:
    2010-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    81.07.Gf
    81.10.St
    81.20.Ka
    Opis:
    As the field of biotechnology expands and the semiconductor industry approaches the limit of size reduction with conventional materials, these and other fields will increasingly rely on nanomaterials with novel properties. Silicon carbide (SiC) possesses many properties that make it appealing to research and industry: a large band gap, high hardness, high strength, low thermal expansion, chemical inertness, etc. It is known that silicon carbide nanowires can be synthesized through a reaction between silicon vapor and multiwalled carbon nanotubes. This process was refined to produce smaller, straighter nanowires. This was done by analyzing the dependence of the reaction rate on the partial vapor pressure of silicon. The reaction rate was studied by comparison of SiC and multiwalled carbon nanotubes peak intensities in X-ray diffractograms, which produced an estimate of the respective reactions' SiC yields. The particle morphologies were then analyzed with transmission electron microscopy. Finally, Fourier transform infrared spectroscopy was utilized to study the intensities and frequencies of the SiC infrared absorption bands. This data was analyzed with respect to the previously determined yield and particle sizes of the respective SiC nanowire samples.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 3; 480-482
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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