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Wyszukujesz frazę "Bhadauria, S." wg kryterium: Autor

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Kinetics studies and mechanism evolution of the epoxidation of styrene over nanoporous Au doped TS-1
    Autorzy:
    Saxena, S.
    Dwivedi, R.
    Bhadauria, S.
    Chumbhale, V. R.
    Prasad, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/778059.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    kinetyka
    epoksydowanie
    Au/TS-1
    styren
    tlenek styrenu
    kinetics
    epoxidation
    styrene
    Styrene Oxide
    Opis:
    A kinetic investigation of the slurry phase epoxidation of styrene with hydrogen peroxide has been carried out, for the first time, over nanoporous Au doped TS-1 catalyst, in a batch reactor, in the temperature range of 313-333 K. It was found that product selectivity and the rate of reaction are greatly influenced by concentrations of styrene and hydrogen peroxide. Kinetics studies reveal that the mechanism of the reaction is of the "Redox" type. The rate equation, r = k 1k2POPH/ (k1PO+ k2PH) deduced, assuming a steady state involving two stage oxidation-reduction process, represent the data most satisfactorily for the conversion of styrene to styrene oxide. A tentative mechanism of the process has also been suggested.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 4; 72-78
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chaotic convection of viscoelastic fluid in porous medium under G-jitter
    Autorzy:
    Bhadauria, B. S.
    Singh, A.
    Singh, M. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/265559.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    teoria nieliniowa
    grawitacja
    konwekcja
    non-linear theory
    gravity modulation
    chaotic convection
    Opis:
    The present article aims at investigating the effect of gravity modulation on chaotic convection of a viscoelastic fluid in porous media. For this, the problem is reduced into Lorenz system (non-autonomous) by employing the truncated Galerkin expansion method. The system shows transitions from periodic to chaotic behavior on increasing the scaled Rayleigh number R. The amplitude of modulation advances the chaotic nature in the system while the frequency of modulation has a tendency to delay the chaotic behavior which is in good agreement with the results due to [1]. The behavior of the scaled relaxation and retardation parameter on the system is also studied. The phase portrait and time domain diagrams of the Lorenz system for suitable parameter values have been used to analyze the system.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 37-51
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The complex Ginzburg Landau model for an oscillatory convection in a rotating fluid layer
    Autorzy:
    Manjula, S. H.
    Kiran, P.
    Reddy, P. Raj
    Bhadauria, B. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/266148.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konwekcja
    teoria nieliniowa
    liczba Nusselta
    convection
    finite amplitude
    nonlinear theory
    rotation modulation
    Nusselt number
    Opis:
    A weakly nonlinear thermal instability is investigated under rotation speed modulation. Using the perturbation analysis, a nonlinear physical model is simplified to determine the convective amplitude for oscillatory mode. A non-autonomous complex Ginzburg-Landau equation for the finite amplitude of convection is derived based on a small perturbed parameter. The effect of rotation is found either to stabilize or destabilize the system. The Nusselt number is obtained numerically to present the results of heat transfer. It is found that modulation has a significant effect on heat transport for lower values of ωf while no effect for higher values. It is also found that modulation can be used alternately to control the heat transfer in the system. Further, oscillatory mode enhances heat transfer rather than stationary mode.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 75-91
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural convection in a hydrodynamically and thermally anisotropic non-rectangular porous cavity: effect of internal heat generation/absorption
    Autorzy:
    Chandran, P.
    Sacheti, N. C.
    Bhadauria, B. S.
    Singh, A. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/264468.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konwekcja naturalna
    materiały porowate
    przepuszczalność
    dyfuzyjność cieplna
    źródło ciepła
    natural convection
    trapezoidal cavity
    porous medium
    permeability
    thermal diffusivity
    Darcy's law
    heat source/sink
    Opis:
    Laminar natural convection in a trapezoidal porous vertical cavity has been investigated in this work. It is assumed that the porous enclosure is filled up with a permeable material subject to hydrodynamic and thermal anisotropy, the flow being governed by the Darcy law as applicable to a non-isotropic medium. It is further assumed that (i) there is heating at the left vertical wall and cooling at the right wall of the enclosure and (ii) the flow domain is subject to the presence of heat source or heat sink. The partial differential equations governing the resulting free convection have been solved numerically in the non-dimensional forms. There arises a number of parameters relating to buoyancy, internal heating, cavity aspect ratio and inclination of the upper surface to the horizontal. The influence of these parameters has been illustrated and analyzed through contours of streamlines and isotherms. We have also discussed the role of internal heating as well as anisotropy on the heat transfer characteristics.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 3; 595-609
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability analysis and internal heating effect on oscillatory convection in a viscoelastic fluid saturated porous medium under gravity modulation
    Autorzy:
    Bhadauria, B. S.
    Singh, M. K.
    Singh, A.
    Singh, B. K.
    Kiran, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/265014.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    analiza stabilności
    grawitacja
    ciecz lepkosprężysta
    nonlinear stability analysis
    complex Ginzburg-Landau equation
    gravity modulation
    internal heating
    bifurcation
    Opis:
    In this paper, we investigate the combined effect of internal heating and time periodic gravity modulation in a viscoelastic fluid saturated porous medium by reducing the problem into a complex non-autonomous Ginzgburg-Landau equation. Weak nonlinear stability analysis has been performed by using power series expansion in terms of the amplitude of gravity modulation, which is assumed to be small. The Nusselt number is obtained in terms of the amplitude for oscillatory mode of convection. The influence of viscoelastic parameters on heat transfer has been discussed. Gravity modulation is found to have a destabilizing effect at low frequencies and a stabilizing effect at high frequencies. Finally, it is found that overstability advances the onset of convection, more with internal heating. The conditions for which the complex Ginzgburg-Landau equation undergoes Hopf bifurcation and the amplitude equation undergoes supercritical pitchfork bifurcation are studied.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 4; 785-803
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First report of leaf spot disease of Aloe vera caused by Fusarium proliferatum in India
    Autorzy:
    Avasthi, S.
    Gautam, A.K.
    Bhadauria, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/66778.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plant disease
    leaf spot disease
    Aloe vera
    Fusarium proliferatum
    pathogenicity
    India
    Opis:
    Severe leaf spot disease was observed on Aloe vera plants in the winters of 2011 and 2012 during a survey of various nurseries of Gwalior, India. Irregular, sunken, dark creamish brown spots having reddish brown margin were noticed on both surfaces of the leaves. The causal organism was consistently isolated from symptomatic leaves on potato dextrose agar media (PDA). A total 59 isolates of fungi were recovered from diseased A. vera leaves, and 37 isolates were identified as belonging to the genus Fusarium. On the basis of morphological characteristics and internal transcribed spacer (ITS) region of rDNA amplified using the primers ITS4/ITS5 the pathogen was identified as Fusarium proliferatum (Matsushima) Nirenberg and pathogenicity of the isolate was confirmed by using Koch’s postulates. To the best of our knowledge, this is the first report of leaf spot disease caused by Fusarium proliferatum on A. vera plants in India.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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