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    Wyświetlanie 1-4 z 4
    Tytuł:
    Relative Explosive Strength and Detonation Characteristics of Some Explosive Mixtures Containing Urea and Peroxides
    Autorzy:
    Hussein, A. K.
    Zeman, S.
    Suceska, M.
    Jungova, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/403797.pdf
    Data publikacji:
    2017
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    urea
    hydrogen peroxide
    perchlorate
    nitrates
    ballistic mortar
    Explo5
    Opis:
    Several mixtures, based on urea, urea hydrogen peroxide complex (UHP), triacetone triperoxide (TATP) with some inorganic oxidants were studied by means of ballistics mortar with TNT as a reference standard. The detonation pressure, P, detonation velocity, D, detonation heat, Q, and volume of gaseous product at standard temperature and pressure conditions (STP condition) were calculated by the mean of Explo5 V6.3. The relatively high explosive strength of some samples relative to the TNT charge, focuses on the positive influence of hydrogen peroxide presence in these mixtures, with advantage in the form of its complex with urea (i.e. as UHP). This influence connects with hydroxi-radical in the mixture under its initiation (as the first intermediate of this initiation reaction).
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2017, 8, 3 (29); 23-32
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent Advances in the Study of the Initiation of Nitramines by Impact Using Their 15N NMR Chemical Shifts
    Autorzy:
    Jungová, M.
    Zeman, S.
    Yan, Q.-L.
    Powiązania:
    https://bibliotekanauki.pl/articles/358278.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    impact sensitivity
    initiation
    15N NMR chemical shifts
    Opis:
    The relationship between the 15N NMR chemical shifts of aza nitrogen atoms in twelve nitramines and the impact sensitivity of these compounds, expressed as the drop energy, Edr, has been analyzed from the point of view of recently published findings. This relationship appears to be the best method for identifying the key atoms at the reaction centre of a given molecule. These atoms might be taken as “chemical hot spots”. The absence of any solid state influence on the chemical shifts, which were here determined in solution, does not have a fundamental influence on the reaction centre identification. The relationship discussed here confirms the close molecular structural dependence for drop energies (impact sensitivities) obtained for individual energetic materials (EMs) by means of a standard impact tester (Julius Peters) with the detection of the 50% probability of initiation based on acoustic detection. The dependence of impact sensitivity on specific crystal surfaces, using samples of individual EMs obtained by screening, should be investigated more extensively.
    Źródło:
    Central European Journal of Energetic Materials; 2014, 11, 3; 383-393
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Different Polymeric Matrices on the Sensitivity and Performance of Interesting Cyclic Nitramines
    Autorzy:
    Elbeih, A.
    Zeman, S.
    Jungova, M.
    Akstein, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/358359.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    HNIW
    BCHMX
    RDX
    HMX
    sensitivity
    performance
    Opis:
    Different polymeric matrices, based on butadiene-styrene rubber, polymethyl-methacrylate and silicone binders, were investigated for their ability to decrease the sensitivity of explosives to different mechanical stimuli. A series of plastic explosives based on four different nitramines, namely RDX (1,3,5-trinitro- 1,3,5-triazacyclohexane), β-HMX (β-1,3,5,7-tetranitro-1,3,5,7-tetrazacyclooctane), BCHMX (bicycloHMX, cis-1,3,4,6-tetranitro-octahydroimidazo-[4,5- d ]imidazole) and ε -HNIW (ε -2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane, ε-CL-20), bonded by the selected polymeric matrices were prepared. Sensitivity to impact of all of the plastic explosives prepared as well as of the pure explosives, was measured using the fall hammer test. Sensitivity to friction was determined using the BAM friction test. The performance was studied using the ballistic mortar test and the results were recorded relative to TNT (trinitrotoluene) as reference. By comparing the results of impact and friction sensitivities, it is obvious that the mechanism of transfer of the friction force to the reaction center of the nitramine molecule should be different from that of impact energy transfer. The silicone binder appeared to be the best polymer for decreasing the sensitivity of explosives. The results of the ballistic mortar proved that the performance of the plastic explosives prepared is affected by the type and weight percentage of the binder in each sample.
    Źródło:
    Central European Journal of Energetic Materials; 2012, 9, 2; 131-138
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fortifcation of W/O Emulsions by Demilitarized Explosives. Part I. Use of TNT
    Autorzy:
    Němec, O.
    Jungová, M.
    Mareček, R.
    Novotný, M.
    Zeman, S.
    Šelešovský, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358504.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    demilitarized explosives
    detonation
    emulsion
    TNT
    Opis:
    This paper presents a study of the relationship between detonation velocities, D, and relative explosive strength (RS) of fortifed W/O emulsion explosives, on the one hand, and the grain size and quality of the demilitarized TNT used for this fortifcation, on the other. It has been found that demilitarized TNT having a grain size below 400 μm could give acceptable results both in terms of initiation and detonation velocity and the RS values. Demilitarized TNT, however, is not a reliable sensitizer even in a micronized state, and therefore using TNT necessitates simultaneous sensitizing of the fnal W/O explosive with microballoons and it has no signifcantly better infuence on the performance of the resulting explosives. The small-scale cook-off test of such a W/O mixture fortifed by 50% by wt. of TNT has shown that such a mixture is a relatively safe explosive.
    Źródło:
    Central European Journal of Energetic Materials; 2011, 8, 3; 193-207
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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