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Wyszukujesz frazę "Lempert, D." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    The outlook for the use of pseudopolymorphic solvates in energetic materials
    Autorzy:
    Lempert, D. B.
    Chukanov, N. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/358246.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    γ-HMX hydrate
    α-CL-20 hydrate
    propellant
    ballistic efficiency
    density
    Opis:
    An analysis of the ballistic characteristics of propellants based on energetic pseudopolymorphic solvates has been performed. It is shown that the ballistic efficiency of solid composite propellants containing γ-HMX or α-CL-20 can be improved considerably by means of the introduction of small molecules into the structural cavities present in the crystal structures of these polymorphs. This effect may appear when small molecules (e.g. water, hydrazine, ethanol) enter into the crystal structure of the main component with no changes in the lattice parameters of the latter.
    Źródło:
    Central European Journal of Energetic Materials; 2014, 11, 2; 285-294
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantitative Variations Resulting from the Gradual Replacement of NO2 with NF2-fragments in Energetic Materials
    Autorzy:
    Lempert, D. B.
    Dorofeenko, E. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358600.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    difluoramines
    solid composite propellants
    specific impulse
    optimal formulation
    boron
    decaborane
    Opis:
    A thermodynamic analysis of the energetic parameters and the combustion products of model energetic systems based on the mixture tetranitromethane + tetra(difluoramino)methane as oxidizer, and combustible components (either polyethylene, or carbon, or boron, or decaborane) has been accomplished. The optimal ratios between the components for achieving the maximal specific impulse have been found. The nature of the combustion products, the dependence of their distribution on the percentage of the components, and how the distribution of the combustion products influences the specific impulse value, have been studied.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 1; 35-46
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energetic Performances of Solid Composite Propellants
    Autorzy:
    Lempert, D.
    Nechiporenko, G.
    Manelis, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/357962.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    solid composite propellant
    specific impulse
    density
    combustion temperature
    formation enthalpy
    Opis:
    Different kinds of solid composite propellant (SCP) are described. All ways to increase energetic potential of SCP are considered as well as pro et contra of each of these ways. Different kinds of oxidizer (perchlorates of ammonium, hydroxylammonium, and hydrazinium; ammonium salt of dinitramine; other saltlike and molecular oxidizers) are under consideration. The main principles creation of SCP formulation with optimal characteristics in the context of their concrete purpose are discussed, e.g. for rockets with considerably low ratio propellant volume/empty construction mass (V/M lower than 1 Litr/kg or so) the ballistic effectiveness may be increased with the replacement of aluminum by high-dense zirconium or zirconium hydride. Possibilities for creation of special SCP formulations for application at the far space, e.g. for Mars exploration are discussed as well.
    Źródło:
    Central European Journal of Energetic Materials; 2011, 8, 1; 25-38
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Basic Characteristics for Estimation Polynitrogen Compounds Effciency
    Autorzy:
    Smirnov, A.
    Lempert, D.
    Pivina, T.
    Khakimov, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/358464.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    polynitrogen compounds
    oxidizers
    hypothetic nitrogen allotropes
    enthalpy of formation
    density
    detonation parameters
    sensitivity
    Opis:
    Basing on analysis of experimental data for physicochemical parameters of 300 energetic compounds from different chemical classes, a set of basic characteristics (enthalpies of formation, molecular crystals densities, detonation parameters, as well as sensitivity to different kinds of impact) has been considered and some calculations schemes have been elaborated to estimate these characteristics for polynitrogen compounds. The limits of physicochemical values for energetic materials (EMs) parameters have been estimated. A large set of compounds has been investigated and some of them seem to be rather effective as explosives or monopropellants. There are about ten powerful compounds (e.g. octanitrocubane, hexanitrohexaazaisowurtzitane, azanitrofurazan, etc.), explosives- oxidizers (such as ammonium dinitroamide and bis(difuroamine-dini troethil) nitroamine) and several hypothetic substances (not synthesized yet), such as octaazacubane, octaazatetraen, tetranitrotetraazacubane etc. Energetic properties were estimated as for individual compounds, as well as for energetic compositions containing these substances together with other ones in the aim to estimate the effectiveness of their use as components of solid composite propellants.
    Źródło:
    Central European Journal of Energetic Materials; 2011, 8, 4; 233-247
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ammonium nitrate phase state stabilization with small amounts of some organic compounds
    Autorzy:
    Golovina, N.
    Nechiporenko, G.
    Nemtsev, G.
    Zyuzin, I.
    Manelis, G. B.
    Lempert, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/358906.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    ammonium nitrate
    phase transitions
    phase stabilization
    intermolecular interactions
    Opis:
    The investigation considers phase stabilization of ammonium nitrate for considerable extension of its application area including new generation of gas-generating compositions for airbag inflators. It was shown that alloys of ammonium nitrate with small amounts (2-10%) of some organic compounds can have no phase transitions or at least have only one instead of three ones in initial ammonium nitrate. The mostly effective as stabilizers are the compounds that have rather close crystallographic parameters. A strong donor-acceptor interaction between nitrate-anion and organic molecules are found. Using quantum-chemical calculations, X-ray analysis, X-ray phase analysis, UV- and IR-spectroscopy it was found a new ammonium nitrate phase state in its alloy with some organic additives. This state is stable in temperature range between -50 and +100 C.
    Źródło:
    Central European Journal of Energetic Materials; 2009, 6, 1; 45-56
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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