Autor: Kumar, P. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Adsorption of Zn(II) ions from aqueous environment by surface modified Strychnos potatorum seeds, a low cost adsorbent
Autorzy:: Senthil, Kumar P.
Tematy:: adsorption
isotherms
kinetics
shrinking core model
Zn(II); Pokaż więcej
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Powiązania:: https://bibliotekanauki.pl/articles/949520.pdf Link otwiera się w nowym oknie
Opis:: The surface modified Strychnos potatorum seeds (SMSP), an agricultural waste has been developed into an effective adsorbent for the removal of Zn(II) ions from aqueous environment. The Freundlich model provided a better fit with the experimental data than the Langmuir model as revealed by a high coefficient of determination values and low error values. The kinetics data fitted well into the pseudo-second order model with the coefficient of determination values greater than 0.99. The influence of particle diffusion and film diffusion in the adsorption process was tested by fitting the experimental data with intraparticle diffusion, Boyd kinetic and Shrinking core models. Desorption experiments were conducted to explore the feasibility of regenerating the spent adsorbent and the adsorbed Zn(II) ions from spent SMSP was desorbed using 0.3 M HCl with the efficiency of 93.58%. The results of the present study indicates that the SMSP can be successfully employed for the removal of Zn(II) ions from aqueous environment.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Higher order eﬃciency and duality for multiobjective variational problem
Autorzy:: Kumar, P.
Sharma, B.
Tematy:: higher order duality
variational problem
eﬃciency of higher order; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/206150.pdf Link otwiera się w nowym oknie
Opis:: In this paper, multiobjective variational programming problem is considered. Mond-Weir type higher order duality results are established by using the eﬃciency of higher order as the optimization tool. In order to prove these results, we propose the notion of generalized higher order (F,ρ,θ,m,h)−invexity.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: (F, ρ)-invexity of higher order for multiobjective fractional variational problem
Autorzy:: Kumar, P.
Sharma, B.
Tematy:: multiobjective
fractional
variational problem
efficiency of higher order
invexity
optimality
higher order duality; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Powiązania:: https://bibliotekanauki.pl/articles/206168.pdf Link otwiera się w nowym oknie
Opis:: Multiobjective fractional variational problem is considered and suﬃcient optimality conditions, characterizing eﬃciency of higher order, are obtained under the assumptions of (F,ρ)−invexity of higher order on the functionals involved. Parametric higher order dual of the above stated problem is proposed. Duality theorems are proved to relate eﬃcient solutions of higher order for primal and its dual problem using generalized class of functionals.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Thermal instability of a heterogeneous Oldroydian viscoelastic fluid heated from below in porous medium
Termiczna niestabilność niejednorodnej lepko-sprężystej cieczy Oldroyda w ośrodku porowatym ogrzewanym od spodu
Autorzy:: Kumar, P.
Mohan, H.
Tematy:: thermal instability
heterogeneous Oldroydian viscoelastic fluid
porous medium
linear stability theory; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/281686.pdf Link otwiera się w nowym oknie
Opis:: The thermal instability of an Oldroydian heterogeneous viscoelastic fluid in a porous medium is considered. Following the linearized stability theory and normal mode analysis, the dispersion relation is obtained. For stationary convection, the medium permeability and density distribution are found to have a destabilizing effect. The dispersion relation is also analyzed numerically. Sufficient conditions for non-existence of overstability are also obtained.
W artykule przedstawiono zagadnienie termicznej niestabilności niejednorodnej cieczy Oldroyda wypełniającej ośrodek porowaty.W wyniku zastosowania zlinearyzowanej teorii stateczności i analizy postaci normalnych określono funkcję dyspersji. Dla stacjonarnej konwekcji stwierdzono, że przepuszczalność ośrodka oraz rozkład gęstości destabilizują ciecz. Funkcję dyspersji wyznaczono także numerycznie. Znaleziono również warunki wystarczające do wykluczenia nadstabilności układu.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Thermosolutal instability in compressible viscoelastic dusty fluid through porous medium
Autorzy:: Kumar, P.
Mohan, H.
Tematy:: płyn lepkosprężysty
cząstki zawieszone
materiały porowate
thermosolutal instability
compressible Walters B’ viscoelastic fluid
suspended particles
porous medium; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/265807.pdf Link otwiera się w nowym oknie
Opis:: Thermosolutal instability in a compressible Walters B’ viscoelastic fluid with suspended particles through a porous medium is considered. Following the linearized stability theory and normal mode analysis, the dispersion relation is obtained. For stationary convection, the Walters B’ viscoelastic fluid behaves like a Newtonian fluid and it is found that suspended particles and medium permeability have a destabilizing effect whereas the stable solute gradient and compressibility have a stabilizing effect on the system. Graphs have been plotted by giving numerical values to the parameters to depict the stability characteristics. The stable solute gradient and viscoelasticity are found to introduce oscillatory modes in the system which are non-existent in their absence.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Oscillator Strengths of the 1s2s$\text{}^{1}$S$\text{}^{e}$ → 1s2p$\text{}^{1}$P$\text{}^{0}$ Transition in He
Autorzy:: Tiwary, S. N.
Kumar, P.
Tematy:: 31.10.+z; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1887915.pdf Link otwiera się w nowym oknie
Opis:: The paper presents configuration interaction (CI) calculations of both the length and velocity forms of the oscillator strengths for 1s2s$\text{}^{1}$S$\text{}^{e}$ → 1s2p$\text{}^{1}$P$\text{}^{0}$ transition in the He atom. For the first time the agreement between the length and velocity values to within about 0.045% has been achieved.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Modified model for shear stress distribution using TRI-1 lunar soil simulant
Autorzy:: Jayalekshmi, S.
Gireesh Kumar, P.
Tematy:: TRI-1
lunar soil simulant
modified model
shear stress distribution; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/949124.pdf Link otwiera się w nowym oknie
Opis:: In the present study, research is carried out on deriving modified analytical equations for finding shear stress distribution and known as Modified Shear Stress models (SSM) beneath plain wheels (small and large) on TRI-1 lunar soil simulant. In all four models, the Reece model, Bekker model, Wong-Reece model and Iagnemma model, normal stress and shear stress are determined, and the shear stress determination is based on the Janosi and Hanamoto (1961) model. There exists ample scope for modifying this model. A modified model for shear stress distribution is developed and the same is discussed in this paper.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

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.
Tematy:: coherent state
non-classical features of optical field
the Hong-Mandel higher-order squeezing
amplitude n th-power squeezing
phase shifting operator; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1054884.pdf Link otwiera się w nowym oknie
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.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Vorticity transport analysis in magnetic viscoelastic fluid
Autorzy:: Kumar, P.
Mohan, H.
Hoshoudy, G.
Tematy:: Rivlin-Ericksen viscoelastic fluid
suspended magnetic particles
vorticity; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/281534.pdf Link otwiera się w nowym oknie
Opis:: Results of investigation on the transport of vorticity in Rivlin-Ericksen viscoelastic fluid in the presence of suspended magnetic particles is presented here. Equations governing the transport of vorticity in Rivlin-Ericksen viscoelastic fluid in the presence of suspended magnetic particles are obtained from the equations of magnetic fluid flow. From these equations it follows that the transport of solid vorticity is coupled with the transport of fluid vorticity. Further, we find that because of thermokinetic process, fluid vorticity may exist in the absence of solid vorticity, but when fluid vorticity is zero, then solid vorticity is necessarily zero. A two-dimensional case is also studied and found that the fluid vorticity is indirectly influenced by the temperature and the magnetic field gradient.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Developing a Secure Image Steganographic System Using TPVD Adaptive LSB Matching Revisited Algorithm for Maximizing the Embedding Rate
Autorzy:: Mohan Kumar, P.
Shanmuganathan, K. L.
Tematy:: executable file
LSBMR
spatial domain
steganalysis
TPVD; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/309092.pdf Link otwiera się w nowym oknie
Opis:: Steganography is the approach for hiding any secret message in a variety of multimedia carriers like images, audio or video files. Whenever we are hiding a data, it is very important to make it invisible, so that it could be protected. A number of steganographic algorithms have been proposed based on this property of a steganographic system. This paper concentrates on integrating Tri way pixel value differencing approach and LSB matching revisited. The secret data embedded in images were images, text and audio signals so far. The proposed scheme has also come with the executable file as secret data. Also, the experimentation results show that, the important properties of a steganographic system such as imperceptibility, capacity of the carrier image and also resistance against the various steganalytic tools have also been achieved with this stego-system.
Dostawca treści:: Biblioteka Nauki

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