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    Wyświetlanie 1-4 z 4
    Tytuł:
    Development and Study of High Energy Igniter/Booster Pyrotechnic Compositions for Impulse Cartridges
    Autorzy:
    Khan, A.
    Malik, A. Q.
    Lodhi, Z. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/358209.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    calorific value
    max no fire current
    stray voltage
    static discharge
    peak pressure
    Opis:
    In order to suitably initiate an impulse cartridge and to get the desired peak pressure, high energy igniter and booster pyrotechnic compositions may be required. Studies were undertaken to develop different types of high energy igniter and booster pyrotechnic compositions comprising B/KNO3, Zr/KClO4 and Pb(SCN)2/KClO3 as igniter compositions, and B/Mg/KClO4/Bi2O3 and B/Mg/KClO4 as booster compositions. Different ratios of fuels and oxidizers were studied in order to determine the best igniter and booster compositions. The measurement of the calorific values for the igniter and the booster compositions, along with safety tests of the igniter compositions, were performed. The pattern of calorific values observed for the igniter and booster compositions under study were B/KNO3 > Zr/KClO4 > Pb(SCN)2/KClO3 and B/Mg/KClO4 > B/Mg/KClO4/Bi2O3, respectively. The newly-developed high energy igniter compositions passed all of the safety tests. Both igniter and booster compositions were also subjected to functional tests in an impulse cartridge. The functional tests were intended for the determination of peak pressure and time to peak pressure. These high energy igniter and booster compositions increased the peak pressure by 8.3% and reduced the time to peak pressure by 14.3% for an impulse cartridge in a closed chamber of volume 230 cm3. The consequence of this research work is that the best combination of igniter and booster compositions in terms of safety, calorific values and cartridge functionality are Zr/KClO4 (40/60) and B/Mg/KClO4 (30/10/60), respectively.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 4; 933-951
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of Shallow Water Waves with Various Boussinesq Equations
    Autorzy:
    Kumar, H.
    Malik, A.
    Singh Gautam, M.
    Chand, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033427.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    Solitons
    exact solutions
    Boussinesq equation
    Opis:
    Attempt has been made to construct the solitary waves and shock wave solutions or domain walls (in higher dimension) for various Boussinesq equations. The method of undetermined coefficients have been used to explore the exact analytical solitary waves and shock wave solutions in terms of bell-shaped sech^p function and kink-shaped tanh^p function for the considered equations. The Boussinesq equation in the (1+1)-dimensional, the (2+1)-dimensional and the (3+1)-dimensional equations are studied and the parametric constraint conditions and uniqueness in view of both solitary waves and shock wave solutions are determined. Such solutions can be valuable and desirable for explaining some nonlinear physical phenomena in nonlinear science described by the Boussinesq equations. The effect of the varying parameters on the development of solitary waves and shock wave solutions have been demonstrated by direct numerical simulation technique.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 275-282
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Capabilities of subsidence detection on mining areas in Upper Silesian Coal Basin using Sentinel-1A data acquired in Interferometric Wide Swath Mode
    Autorzy:
    Malik, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/184508.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    earth surface
    monitoring
    satellite radar
    Opis:
    Monitoring of the Earth Surface using SAR satellite radar is an increasingly used tool in case of natural and anthropological hazards (Perski 1999). Differential Interferometry SAR (DInSAR) and Persistent Scatterer Interferometry SAR (PSInSAR) are satellite SAR radar interferometry methods. These are well-known and widely used tools for detecting ground deformation (Porzycka & Leśniak 2010). New generation of SAR antennas provide the imagery with sub-meter resolution. It allows for computing very accurate interferograms capable for slow and dynamic subsidence detection over even small areas. These properties of SAR technology are very important in case of heavily populated mining regions, where comes to damage to residential buildings (Mirek 2012). Studies presented in this paper refer to the Upper Silesian Coal Basin (South Poland), which is vulnerable to the subsidence phenomenon. The aim of this study was to determine the applicability of the interferometric analysis of different zones in Upper Silesian Coal Basin. In this area subsidence occurs at different rates and can be divided into slow displacement with wide range and dynamic subsidence of small areas. In the described work the analysis of ground deformation was performed using Sentinel-1A data acquired in Interferometric Wide Swath Mode (IWS) with 12 days revisit and 5 × 20 meters ground resolution. Free and open access to Sentinel-1 satellite data are granted for the Copernicus programme. It is focused on global coverage and quick data delivery (ESA website). The obtained results show the capabilities and limitations of this technology in case of vertical ground deformation velocity compared to its range. The relationship between the spatial resolution of the imagery and the dynamics of subsidence was presented. Finally the possibility of using PSInSAR method with Sentinel-1A data was presented (Strzelczyk & Porzycka-Strzelczyk 2014).
    Źródło:
    Geology, Geophysics and Environment; 2016, 42, 1; 94
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie dekoncentryczności przyrostów rocznych świerka pospolitego (Picea abies Karst.) w analizie dynamiki osuwiska - przykład z masywu Hrubego Jesenika (Sudety Wschodnie)
    Autorzy:
    Wistuba, M.
    Malik, I.
    Gartner, H.
    Kojs, P.
    Krapiec, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/880305.pdf
    Data publikacji:
    2012
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
    Źródło:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2012, 14, 1[30]
    1509-1414
    Pojawia się w:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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