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    Wyświetlanie 1-3 z 3
    Tytuł:
    Experimental and modelling investigation of caesium adsorption on soil samples around DAE facility, India
    Autorzy:
    Maity, Sukanta
    Sandeep, Police
    Sahu, Sanjay Kumar
    Kumar, A. Vinod
    Powiązania:
    https://bibliotekanauki.pl/articles/1030685.pdf
    Data publikacji:
    2020
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CEC
    Laboratory batch method
    caesium
    chemical parameters
    distribution coefficient (Kd)
    equilibration time
    isotherm
    rate constant
    Opis:
    The kinetics and thermodynamics behind the sorption process of Cs (Caesium) on the soil are important to understand as these studies give information about the mobility of Cs in the environment. In the present study, sorption kinetics and the parameters influencing sorption (viz. time of contact, competing ions, temperature, solution pH and Cs concentration) were studied on the soil samples collected from Tarapur area. Site-specific distribution coefficient (Kd) of Cs was also estimated in soil samples collected from different locations across Tarapur, India using laboratory batch method. The effect of soil parameters (viz. pH, cation exchange capacity, organic matter and CaCO3) on Kd values of Cs was also investigated. The data of Cs adsorption on the soil is well fitted with the pseudo-second-order kinetic equation with the correlation coefficient (R2) value of 0.99. The rate constant (k2) of Cs adsorption (at 25 ºC) on collected soil samples was found to be 3.33×105 g µg-1 min-1. In the present study, Cs adsorption data were well fitted with Freundlich and Dubinin–Radushkevich (D–R) isotherm models. The change of enthalpy (ΔH), entropy (ΔS) and Gibbs free energy (ΔG) were estimated for the Cs adsorption on soil samples. Results showed that the adsorption process was exothermic (ΔH = -3.69 J mol−1) and favoured at a lower temperature. The calculated ΔG value (< 0) indicates that the Cs sorption on the soil is a spontaneous process. The Kd values were found to the range of 58 ± 2 to 275 ± 10 kg-1. The parametric study indicated CEC to have a stronger influence as compared to pH, OM and CaCO3 in the soil samples.
    Źródło:
    World Scientific News; 2020, 139, 2; 201-220
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, spectral and thermal study of (2E,6E)-2,6-bis(4-aminobenzylidene)cyclohexanone
    Autorzy:
    Patel, Jignesh P.
    Parsania, P. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1063056.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    (2E
    6-bis(4-aminobenzylidene)cyclohexanone
    6E)-2
    Anderson-Freeman method
    Photoactive diamine
    kinetic parameters
    thermal stability
    Opis:
    (2E,6E)-2,6-bis(4-aminobenzylidene)cyclohexanone (BABC) was synthesized by two-step reaction of p-nitrobenzaldehyde and cyclohexanone followed by its reduction. The structure of BABC was supported by UV-Vis, FTIR, 1HNMR and mass spectral data. DSC endothermic transition at 230.6 ºC is assigned as melting transition followed by decomposition reaction. BABC is thermally stable up to 240 ºC and followed three step degradation kinetics. Various kinetic parameters were determined by Anderson-Freeman method and discussed.
    Źródło:
    World Scientific News; 2019, 124, 2; 312-318
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some applications of Noether’s theorem
    Autorzy:
    Montiel-Pérez, J. Yaljá
    López-Bonilla, J.
    López-Vázquez, R.
    Vidal-Beltrán, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1166045.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Complex Riemann-Silberstein vector
    Duality rotations
    Ignorable variable
    Invariance of the action
    Lanczos variational method
    Linear differential equation of second order
    Maxwell equations
    Noether’s theorem
    Variation of parameters
    Variational symmetry
    Opis:
    If the action S= ∫_(t_1)^(t_2)▒〖L(q,〗 (q,) ̇t) dt is invariant under the infinitesimal transformation t ̃=t+ε τ(q,t), q ̃_r= q_r+ε ξ_r (q,t),r=1,… ,n, with ε=constant ≪1, then the Noether’s theorem permits to construct the corresponding conserved quantity. The Lanczos approach employs to ε= q_(n+1) as a new degree of freedom, thus the Euler-Lagrange equation for this new variable gives the Noether’s constant of motion. Torres del Castillo and Rubalcava-García showed that each variational symmetry implies the existence of an ignorable coordinate; here we apply the Lanczos approach to the Noether’s theorem to motivate the principal relations of these authors. The Maxwell equations without sources are invariant under duality rotations, then we show that this invariance implies, via the Noether’s theorem, the continuity equation for the electromagnetic energy. Besides, we demonstrate that if we know one solution of p(x)y''+q(x)y'+r(x)y=0, then this Lanczos technique allows obtain the other solution of this homogeneous linear differential equation.
    Źródło:
    World Scientific News; 2018, 106; 69-80
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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