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Wyszukujesz frazę "Prakash, R." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Soil microbial and nutrient dynamics influenced by irrigation-induced salinity and sewage sludge incorporation in sandy - loam textured soil
    Autorzy:
    Ankush
    Prakash, R.
    Kumar, R.
    Singh, V.
    Harender
    Singh, V.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082943.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    sewage sludge
    saline irrigation
    soil
    microbial
    biomass carbon
    enzyme activity
    Opis:
    The use of sewage sludge in agriculture is known to be environmentally friendly as it is a practical way of recycling municipal waste. A short-term experiment was carried out to study the changes in soil chemical and microbiological properties influenced through the addition of sewage sludge along with saline irrigation under a pearl millet-wheat crop rotation. There were three irrigation (canal water (0.35 dS m-1), 8 and 10 dS m-1 electrical conductivity saline water) and five fertilizer treatments (control-F1, sewage sludge (5 t ha-1)-F2, sewage sludge (5 t ha-1) +50% recommended dose of fertilizer (RDF)-F3, sewage sludge (5 t ha-1)+75% RDF-F4 and RDF-F5). The results showed that soil organic carbon, and available nitrogen, and phosphorus were reduced significantly under saline conditions but there was an increase in available potassium with the increasing salinity levels of the irrigation water. A significant reduction in soil microbial biomass carbon and enzyme activities was caused by 8 and 10 dS m-1 as compared to 0.35 dS m-1 at different growth stages of crops. Treatment F4 attained the highest soil microbial activity at each crop growth stage by a significant margin among all of the fertilizer treatments, which is associated with a substantial build-up of organic carbon and available NPK in the soil. Soil microbial activities followed a particular trend: at 35 and 75 days after sowing>harvest>sowing in pearl millet and wheat, respectively. Sewage sludge dumping is a major problem in India, and the present study suggests that by applying sewage sludge, soil biological health is improved; therefore its use in agriculture is recommended to farmers.
    Źródło:
    International Agrophysics; 2020, 34, 4; 451-462
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal convection in a ferromagnetic fluid layer with magnetic field dependent viscosity: a correction applied
    Autorzy:
    Prakash, J.
    Kumar, R.
    Kumari, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/178325.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ferromagnetic convection
    magnetic field dependent viscosity
    stationary convection
    Rayleigh number
    Opis:
    The effect of magnetic field dependent (MFD) viscosity on thermal convection in a horizontal ferromagnetic fluid layer has been investigated numerically. A correction is applied to Sunil et al. [24] which is very important in order to predict the correct behavior of MFD viscosity. Linear stability analysis has been carried out for stationary convection. The MFD viscosity parameter δ as well as the measure of nonlinearity of magnetization M3, both have a stabilizing effect on the system. Numerical results are also obtained for large values of magnetic parameter M1 and predicted graphically.
    Źródło:
    Studia Geotechnica et Mechanica; 2017, 39, 3; 39-46
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of the Hong-Mandel higher-order squeezing and amplitude odd-power squeezing in even coherent state by its superposition with vacuum state
    Autorzy:
    Kumar, P.
    Kumar, R.
    Prakash, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054884.pdf
    Data publikacji:
    2017-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    coherent state
    non-classical features of optical field
    the Hong-Mandel higher-order squeezing
    amplitude n th-power squeezing
    phase shifting operator
    Opis:
    We study the Hong-Mandel 2n th-order squeezing of the Hermitian operator, X_θ ≡ X₁cosθ + X₂sinθ and amplitude n th-power squeezing of the Hermitian operator, Y_θ^{(n)} ≡ Y₁^{(n)}cosθ + Y₂^{(n)}sinθ in superposed state |ψ⟩ = K[|α,+⟩ + re^{iφ}|0⟩], of vacuum state and even coherent state defined by |α,+⟩ = K_+[|α⟩+|-α⟩]. Here operators X_{1,2} are defined by X₁ + iX₂ = a, operators Y_{1,2}^{(n)} are defined by Y₁^{(n)} + iY₂^{(n)} = aⁿ, a is the annihilation operator, α, θ, r and φ are arbitrary and the only restriction on these is the normalization condition of the superposed state. We show that the Hong-Mandel 2n th-order squeezing and amplitude odd-power squeezing exhibited by even coherent state enhance in its superposition with vacuum state. Variations of these higher-orders squeezing with different parameters near its maxima have also been discussed.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 6; 1485-1490
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The onset of convection in a rotating multicomponent fluid layer
    Autorzy:
    Prakash, J.
    Singh, V.
    Kumar, R.
    Kumari, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/281283.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    multicomponent convection
    principle of exchange of stabilities
    oscillatory motions
    complex growth rate
    concentration Rayleigh number
    Lewis number
    Opis:
    The onset of convective instability is analysed in a rotating multicomponent fluid layer in which density depends on n stratifying agents (one of them is heat) having different diffusivities. Two problems have been analysed mathematically. In the first problem, a sufficient condition is derived for the validity of the principle of the exchange of stabilities. Further, when the complement of this condition holds good, oscillatory motions of neutral or growing amplitude can exist, and thus it is important to derive upper bounds for the complex growth rate of such motions when at least one of the bounding surfaces is rigid so that exact solutions of the problem in closed form are not obtainable. Thus, as the second problem, bounds for the complex growth rates are also obtained. Above results are uniformly valid for quite general nature of the bounding surfaces.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 477-488
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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