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    Wyświetlanie 1-4 z 4
    Tytuł:
    Numerical modelling of the competition between the adaptive immune system and virus
    Autorzy:
    Kolev, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/206177.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    numerical modelling
    kinetic theory
    active particles
    integro-differential equations of Boltzmann type
    nonlinear dynamics
    virus
    adaptive immune system
    Opis:
    We present and analyze numerically a mathematical model of interactions between adaptive immune system and viral infection. The model is a bilinear system of partial integro-differential equations of Boltzmann type. It is a generalization of the recently proposed kinetic models that consider particular (namely, the cellmediated and the humoral) immune mechanisms used in the fight against viral infections. We use Matlab to solve complicated system of equations, present the results of computer simulations and explain their immunological meaning. The results show that the model can describe in a better way (in comparison with the previous kinetic models) real biological situations and is able to illustrate various methods of therapy.
    Źródło:
    Control and Cybernetics; 2011, 40, 3; 763-778
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient nitrate adsorption from water by aluminum powder. Kinetic, equilibrium and influence of anion competition studies
    Autorzy:
    Fakhri, Y.
    Kakavandi, B.
    Safaei, Z.
    Asadi, A.
    Mohseni, S. M.
    Golestanifar, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/208008.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    aluminium compounds
    kinetic parameters
    kinetic theory
    negative ions
    nitrates
    nitrogen removal
    particle size
    związki glinu
    parametry kinetyczne
    teoria kinetyczna
    jony ujemne
    azotany
    usuwanie azotu
    rozmiar cząstek
    Opis:
    The feasibility of aluminum powder (with particle size of 75–150 μm) for nitrate removal from aqueous solutions has been investigated. Adsorption was examined in function of initial nitrate concentration, contact time, pH and influence of other interfering anions. Maximum nitrate removal occurred at equilibrium pH of 10. The kinetics of adsorption of nitrate ions was discussed based on three kinetic models, namely: the pseudo-first order, the pseudo-second order and the intraparticle diffusion model. The experimental data fitted the pseudo-second order kinetic model very well; the rate constant was 4x10–4 g/ (mg·min) at the concentration of NO3- of 100 mg/dm3. The adsorption data followed both Langmuir (R2 = 0.808) and Freundlich (R2 = 0.865) isotherms probably due to the real heterogeneous nature of the surface sites involved in the nitrate uptake. The maximum sorption capacity of aluminum powder for nitrate adsorption was found to be ca. 45.2 mg/g at room temperature. The results indicate that aluminum powder is an interesting alternative for nitrate removal from the water.
    Źródło:
    Environment Protection Engineering; 2018, 44, 3; 19-31
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    DFT/PM3 study of the enoyl-CoA hydratase catalyzed reaction
    Autorzy:
    Pawlak, J.
    Bahnson, B.
    Anderson, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/146962.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    coenzyme-A
    density functional theory
    enoyl-CoA hydratase
    kinetic isotope effect
    ONIOM model
    stepwise mechanism
    thiolester enolate
    Opis:
    The enoyl-CoA hydratase catalyzed hydration of alfa,beta-unsaturated thiolesters has been modeled by using the crystal structure of 4-(N,N-dimethylamino)cinnamoyl-CoA bound at the active site. The quantum chemical calculation used the ONIOM mixed level procedure to permit the substrate thiolester and water molecule to be modeled using B3LYP/6-31G(d) level of theory and the active site residues modeled at a semiempirical level using the PM3 Hamiltonian. The results permitted the identification of a stable thiolester enolate intermediate, supporting a stepwise reaction mechanism. The calculation also suggests that the same proton removed from the nucleophilic water molecule is transferred to C alfa in the subsequent protonation of the enolate intermediate. This observation reconciles the stepwise mechanism with the previously reported double isotope effect study [3].
    Źródło:
    Nukleonika; 2002, 47,suppl.1; 33-36
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Free vibrations of column subjected to Euler's load with consideration of Timoshenko's theory
    Autorzy:
    Uzny, S.
    Sokół, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/128238.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    column
    Timoshenko's theory
    Bernoulli-Euler's theory
    free vibrations
    kinetic criterion of stability
    divergence instability
    characteristic curves
    kolumna
    teoria Timoshenki
    teoria Bernoulliego-Eulera
    drgania swobodne
    kinetyczne kryterium stateczności
    niestateczność dywergencyjna
    krzywe charakterystyczne
    Opis:
    In this paper the single-rod cantilever column subjected to compressive Euler's load is investigated. The boundary problem has been formulated on the basis of Hamilton's principle and Timoshenko's theory. Numerical simulations of characteristic curves have been plotted on the plane external load-vibration frequency for different magnitudes of slenderness factor of the system. The results of numerical calculations of Timoshenko's beam are compared to the ones obtained from mathematical Bernoulli-Euler's model. The comparison of the results of characteristic curves calculated by means of Timoshenko's theory and Bernoulli-Euler's model are done for first three vibration frequencies.
    Źródło:
    Vibrations in Physical Systems; 2014, 26; 319-326
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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