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    Wyświetlanie 1-5 z 5
    Tytuł:
    Impulse Response Functions in the Dynamic Stochastic General Equilibrium Vector Autoregression Model
    Autorzy:
    Wróbel-Rotter, Renata
    Powiązania:
    https://bibliotekanauki.pl/articles/2076473.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic stochastic general equilibrium vector autoregression
    DSGE-VAR
    impulse response functions
    marginal data density
    Opis:
    The model considered in the paper is defined as VAR with the prior distribution for parameters generated by the dynamic stochastic general equilibrium (DSGE) model. The degree of economic restrictions in the DSGE- VAR model is controlled by the weighting parameter. In the paper there is investigated the impact of the weighting parameter prior specifications for the posterior shape of impulse response functions (IRFs). In case of conditional models the paths of IRFs highly depend on the value of the weighting parameter that is set arbitrary. When considering full estimation with different prior types, means and gradual change in the dispersion the posterior time paths of IRFs are similar in models with high values of the marginal data densit
    Źródło:
    Central European Journal of Economic Modelling and Econometrics; 2016, 2; 93-114
    2080-0886
    2080-119X
    Pojawia się w:
    Central European Journal of Economic Modelling and Econometrics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Theoretical Study of Polyethylene Glycol Polynitrates as Potential Highly Energetic Plasticizers for Propellants
    Autorzy:
    Wang, Guixiang
    Xu, Yimin
    Zhang, Wenjing
    Gong, Xuedong
    Powiązania:
    https://bibliotekanauki.pl/articles/358877.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    polyethylene glycol polynitrates
    density functional theory
    density
    specific impulse
    stability
    Opis:
    Polyethylene glycol polynitrates may be used as plasticizers in propellants. In this study, ten derivatives of ethylene glycol dinitrate were investigated using the density functional theory method. The fitted densities (ρ’exp.) were obtained and were very close to the experimental values. The detonation properties were predicted using the modified Kamlet-Jacobs equations and the specific impulse (Is) was evaluated according to the largest exothermic principle. A new indicator, K = Is · ρ’exp., is proposed to evaluate the energetic characteristics of the plasticizers. Thermal stability is discussed by calculating the bond dissociation energies or energy barriers. The O−NO2 bond is the trigger bond for all of the compounds studied. Considering the energetic properties and stability, diethylene glycol tetranitrate, triethylene glycol hexanitrate, tetraethylene glycol octanitrate, pentaethylene glycol decanitrate and hexaethylene glycol dodecanitrate are potential energetic plasticizers for solid propellants. The influences of the −O−CH2−CH2− and −O−CH(ONO2)−CH(ONO2)− groups are also discussed, which will be helpful for the design of new highly energetic plasticizers by modifying the structures as required.
    Źródło:
    Central European Journal of Energetic Materials; 2019, 16, 2; 194-215
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies on the High Performance Characteristics of an Aluminized Ammonium Perchlorate Composite Solid Propellant Based on Nitrile Butadiene Rubber
    Autorzy:
    Sudhir, Singh
    Sidharth, Raveendran
    Dhirendra, Kshirsagar R.
    Gupta, Manoj
    Chetan, Bhongale
    Powiązania:
    https://bibliotekanauki.pl/articles/27787902.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    composite solid propellant
    dibutyl phthalate
    high density specific impulse
    nitrile-butadiene rubber
    pot life
    spreadibility
    yield stress
    Opis:
    n the present study, a high performance composite solid propellant formulation was prepared based on nitrile butadiene rubber (NBR) and dibutyl phthalate (DBP) plasticizer, which has a longer pot life and high density specific impulse. The developed cost effective novel binder system was prepared with readily available raw materials (NBR and DBP). The formulation of the composition was performed by varying the content of the NBR/DBP binder in the range of 14-20%. The rocket performance characteristics were determined theoretically using PROPEP and compared with those of an HTPB based propellant. The rheological, mechanical, physical, ballistic and thermal properties of the NBR/DBP propellant were studied and compared with literature data for similar compositions based on an HTPB/dioctyl adipate (DOA) binder. The yield stress was determined by spreadibilty measurements, and indicated the superiority of this binder based propellant over existing composite propellants. It was concluded that following decreasing the content of the NBR/DBP binder in the propellant from 20 to 14%: in the range 58.83-78.45 bar (5.883-7.845 MPa), the pressure index increased from 0.159 to 0.371, – at 68.64 bar (6.864 MPa), the burning rate increased from 4.10 to 6.54 mm/s, but the theoretical specific impulse value did not change significantly (258.0259.8 s), – the tensile strength and E-modulus increased from 6.03 to 9.88 (0.591-0.969) to and from 18.00 to 75.00 kgf/cm2 (1.765 to 7.355 MPa), respectively. Moreover, a DSC and TGA study indicated a lower decomposition temperature for the NBR/DBP propellant compared to the HTPB propellant. The NBR/DBP propellant exhibited a pot life more than double that of a conventional HTPB/ DOA based propellant.
    Źródło:
    Central European Journal of Energetic Materials; 2021, 18, 4; 492--511
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie zjawiska wybuchu w powietrzu ładunków wydłużonych typu saletrole z zastosowaniem nowoczesnych metod numerycznych
    Research of ANFO cylindrical explosive charge detonation in air using modern numerical modeling methods
    Autorzy:
    Maranda, A.
    Koślik, P.
    Hadzik, J.
    Wilk, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/142798.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    fala podmuchowa
    saletrole
    symulacje komputerowe
    gęstość impulsu
    blast wave
    ANFO
    computer simulation
    impulse density
    Opis:
    Artykuł przedstawienia wyniki analiz numerycznych wybuchu w powietrzu ładunku materiału wybuchowego typu saletrole, przy użyciu programu Ansys LS-Dyna. Wyniki analiz numerycznych odniesione zostały do rzeczywistego efektu wybuchu w badaniach poligonowych. Badania symulacyjne i poligonowe wykonano dla ładunku cylindrycznego o średnicy 45 mm i długości 250 mm. Z pomiarem ciśnienia fali podmuchowej w trzech charakterystycznych kierunkach względem ładunku wykonano jednocześnie test Helda, w którym określono gęstości impulsu fali podmuchowej.
    This paper presents the results of saletrole cylindrical explosive charge detonation in the air, using Ansys LS-Dyna program. Results of numerical analyzes were referenced to the actual effects of detonation in proving ground researches. Simulation and experimental researches were performed for cylindrical charges having a diameter 45 mm and length 250 mm. Additionally the measurements of the blast wave intensity were conducted by using Held’s Method, and measurements of the blast wave overpressure in three characteristic directions relative to the charge are also discussed.
    Źródło:
    Chemik; 2014, 68, 1; 9-16
    0009-2886
    Pojawia się w:
    Chemik
    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
      Wyświetlanie 1-5 z 5

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