Wszystkie pola: Yadav, R. R. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Size Dependent Acoustical Properties of bcc Metal
Autorzy:: Yadav, R. R.
Pandey, D. K.
Powiązania:: https://bibliotekanauki.pl/articles/2043375.pdf
Data publikacji:: 2005-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 62.20.Dc
62.65.+k
63.20.Kr
Opis:: The ultrasonic attenuation is evaluated at 300 K along [100], [110], and [111] directions for the characterization of bcc metal Ta. The size of the metal is considered in nanorange. Ultrasonic velocity, Grüneisen parameter and acoustic coupling constant that depend on second and third order elastic constants are calculated for determination of ultrasonic attenuation coefficient. Second and third order elastic constants of the bcc metal Ta at nanoscale at 300 K are also calculated starting with only two basic parameters. For the information about defects at nanoscale, the dislocation drag coefficients are calculated for the metal at different size along [100] orientation. The ultrasonic attenuation increases with the size of material as the size variation of the thermal conductivity and the thermal relaxation time. There is significant increase in the attenuation up to 150 nm.
Źródło:: Acta Physica Polonica A; 2005, 107, 6; 933-946
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Steady Oseen’s flow past a deformed sphere: an analytical approach
Autorzy:: Srivastava, D. K.
Yadav, R. R.
Yadav, S.
Powiązania:: https://bibliotekanauki.pl/articles/280226.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: Stokes drag
Oseen’s drag
axially symmetric arbitrary body
axial flow
Opis:: In a recent authors’ paper, the general expression of Stokes drag experienced by a deformed sphere in both longitudinal and transverse flow situations was calculated in terms of the deformation parameter up to the second order. In this paper, Oseen’s correction to the axial Stokes drag on the deformed sphere is presented by using Brenner’s formula in general, first and then applied to prolate and oblate the deformed spheroid up to the second order of the deformation parameter. Numerical values of Oseen’s correction is obtained with respect to the deformation parameter and Reynolds number. The corresponding variations are depicted in figures. Some particular cases of a needle shaped body and flat circular disk are considered and found to be in good agreement with those existing in the literature. The import ant applications are also highlighted.
Źródło:: Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 661-673
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Stokes flow around slowly rotating concentric previous spheres
Przepływ stokesowski wokół powolnie wirujących koncentrycznych kul przepuszczalnych
Autorzy:: Srivastava, D. K.
Yadav, R. R.
Yadav, S.
Powiązania:: https://bibliotekanauki.pl/articles/140159.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: rotation of concentric spheres
fluid sink
slow viscous flow
Stokes approximation
wirowanie kul koncentrycznych
zlew płynu
lepki powolny przepływ
aproksymacja Stokes'a
Opis:: In this paper, the problem of concentric pervious spheres carrying a fluid sink at their centre and rotating slowly with different uniform angular velocities Ω₁, Ω₂ about a diameter has been studied. The analysis reveals that only azimuthal component of velocity exists and the torque, rate of dissipated energy is found analytically in the present situation. The expression of torque on inner sphere rotating slowly with uniform angular velocity Ω₁, while outer sphere also rotates slowly with uniform angular velocity Ω₂, is evaluated. The special cases like, (i) inner sphere is fixed (i.e. Ω₁ = 0), while outer sphere rotates with uniform angular velocity Ω₂, (ii) outer sphere is fixed (i.e. Ω₂ = 0), while inner sphere rotates with uniform angular velocity Ω₁, (iii.) inner sphere rotates with uniform angular velocity Ω₁, while outer rotates at infinity with angular velocity Ω₂; have been deduced. The corresponding variation of torque with respect to sink parameter has been shown via figures. AMS subject classification – 76 D07.
W artykule rozważa się problem koncentrycznych kul przepuszczalnych, ze zlewem płynu w centrum, które wirują powoli wokół średnicy z jednostajnymi prędkościami kątowymi Ω₁ i Ω₂. Analiza wykazała, że istnieje tylko azymutalny składnik prędkości, a moment obrotowy i szybkość rozpraszania energii są w istniejących warunkach wyznaczane analitycznie. Wyprowadzono wyrażenie na moment obrotowy na powierzchni wewnętrznej kuli powolnie wirującej z jednostajną prędkością kątową Ω₁, podczas gdy kula zewnętrzna także powolnie wiruje z jednostajną prędkością kątową Ω₂. Zbadano także przypadki szczególne, takie jak: (i) kula wewnętrzna jest nieruchoma (tzn. Ω₁ = 0), podczas gdy kula zewnętrzna wiruje z jednostajną prędkością kątową Ω₂, (ii) kula zewnętrzna jest nieruchoma (tzn. Ω₂ = 0), podczas gdy kula wewnętrzna wiruje z jednostajną prędkością kątową Ω₁, (iii) kula wewnętrzna wiruje z jednostajną prędkością kątową Ω₁, podczas gdy kula zewnętrzna wiruje w nieskończonej odległości z prędkością kątową Ω₂. Na wykresach przedstawiono zależności między zmianami momentu obrotowego a parametrami zlewu.
Źródło:: Archive of Mechanical Engineering; 2013, LX, 2; 165-184
0004-0738
Pojawia się w:: Archive of Mechanical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Electro-Optical Behavior of Dye Doped Nematic Liquid Crystal
Autorzy:: Yadav, S.
Pandey, K.
Misra, A.
Manohar, R.
Powiązania:: https://bibliotekanauki.pl/articles/1505061.pdf
Data publikacji:: 2011-06
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.70.M-
42.79.Kr
Opis:: We report electro-optical behavior of a dye doped nematic liquid crystal. The dye doped cells have shown some improvement in some parameters important for the display devices such as threshold voltage $(V_{th})$, splay elastic constant, rotational viscosity and response time. The suppression of screening effect improves the threshold voltage for the doped sample.
Źródło:: Acta Physica Polonica A; 2011, 119, 6; 824-828
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Salinity stress effects on the growth, morphological, physiological, and biochemical properties of Melia (Melia dubia Cav.) plant
Autorzy:: Kumar, R.
Banyal, R.
Singh, A.
Yadav, R.K.
Sharma, P.C.
Powiązania:: https://bibliotekanauki.pl/articles/2078273.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Instytut Dendrologii PAN
Tematy:: Melia
salt stress
growth
physiology
phenology
biochemical
Opis:: Salinity stress severely affects the growth, physiological and developmental processes in plant species. Melia dubia is an ecologically and economically important tree species of the Indian subcontinent. However, systematic information with respect to the species salt tolerance potential is completely lacking. Under salt stress conditions, determining suitable soil EC range is required for the better survival, growth and productivity of the tree species. In present study, we investigated the effects of different soil salinity (EC 4, 8, and 12) levels on the ion homeostasis, physio-biochemistry, morphology, and growth of M. dubia plant. Results revealed that increase in soil salinity causes higher Na+ content and Na+/K+ ratio, while lower K+ content, in the leaf tissues of M. dubia. The physiological processes such as the photosynthetic rate, stomatal conductance, internal CO2 concentration, and transpiration rate were adversely affected with the increased salt stress levels. Morphological parameters, such as internodal length, petiole length, leaf length, and leaf width also decreased (P<0.05) under saline stress conditions. Results further indicat- ed that salinity levels significantly (P<0.05) affected the M. dubia growth, and the growth rate was found optimum upto 8 EC, thereafter it slightly decreased with the increased salt stress to 12 EC. Our findings showed that increased salinity stress causes significant changes in the physiological, morphological, and growth pattern of M. dubia. Therefore, based on present experiment, we found M. dubia suitable for the salt affected soils of EC 8 with optimum growth rate and at EC 12 with the moderate (20–25%) growth reduction.
Źródło:: Dendrobiology; 2021, 86; 56-68
1641-1307
Pojawia się w:: Dendrobiology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The effects of viscosity on the structure of shock waves in a non-ideal gas
Autorzy:: Anand, R.
Yadav, H.
Powiązania:: https://bibliotekanauki.pl/articles/1075490.pdf
Data publikacji:: 2016-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 52.35.Tc
47.55.Kf
47.40.-x
Opis:: This work presents the structure of viscous shock front in a non-ideal gas. The analytical expressions for the particle velocity, temperature, pressure and change-in-entropy within the shock transition region are derived taking into consideration the Landau and Lifshitz equation of state for non-ideal gas. The effects on the structure of shock front due to the variations of the coefficient of viscosity, Mach number, adiabatic exponent and parameter of non-ideality of the gas are investigated. The model developed in the paper is valid only for small values of Mach number M i.e., M<2.5.
Źródło:: Acta Physica Polonica A; 2016, 129, 1; 28-34
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Effect of demand boosting policy on optimal inventory policy for imperfect lot size with backorder in fuzzy environment
Autorzy:: Yadav, D.
Singh, S. R.
Kumari, R.
Powiązania:: https://bibliotekanauki.pl/articles/206244.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:: learning curve
advertisement
signed distance
triangular fuzzy number
backorder
inventory model
Opis:: This paper investigates an Economic Order Quantity (EOQ) model with backorder by taking imprecise demand rate with dependence upon the frequency of advertisement. The formulated model also incorporates learning effects on percentage of defective items present in each lot. Due to imprecision in demand, the obtained profit function is fuzzy. To determine the optimal values, we determine the equivalent crisp profit function by applying the signed distance method. Optimal order quantity and backorder level are obtained by using algebraic method in place of differential calculus. A numerical example is used to study the behavior of the model with respect to different inventory parameters. All calculations are performed with MATLAB 7.4.
Źródło:: Control and Cybernetics; 2012, 41, 1; 191-212
0324-8569
Pojawia się w:: Control and Cybernetics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Recent Scenario of Solid Waste Management in India
Autorzy:: Nandan, Abhishek
Yadav, Bikarama Prasad
Baksi, Soumyadeep
Bose, Debajyoti
Powiązania:: https://bibliotekanauki.pl/articles/1182742.pdf
Data publikacji:: 2017
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: 3R concept
Collection
Disposal
Landfilling
Municipal Solid Waste
Segtegation
Treatment
Waste generation
Opis:: Industrialization becomes very significant for developing countries like India having large number of population. Rapid increase in urbanization and per capita income lead to high rate of municipal solid waste generation. In recent times, E-waste and plastic waste also contribute considerably to total waste stream due to utilization of electronic and other items. These wastes may cause a potential hazard to human health or environment if any of the aspects of solid waste management is not managed effectively. In India, approach towards Solid waste management is still unscientific. Solid Waste collection efficiency in India is around 70% (Sharholy et al. 2007), while same is almost 100% in the developed countries. Even today, large portion of solid waste is dumped indiscriminately on outskirts of towns or cities without any prior treatment. This leads to groundwater contamination and increase in air pollution due to leachate percolation and release of gases respectively. Various study reveals that out of total solid waste, 80% can be utilized again either by recycling or reusing. Improper waste segregation and other factors lead recycling sector to work on outdated technology. However, plastic and paper recycling have been especially growing due to continuous increasing consumption of both the commodities. This study describes about current status of municipal solid waste management in different regions of India. It further summarizes a collective, systematic effort which improves implementation of legal frameworks, institutional arrangements, financial provisions, technology, operations management, human resource development, and public participation and awareness of Integrated SWM systems.
Źródło:: World Scientific News; 2017, 66; 56-74
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: The Structure of the (100) Surface of Ag-In-Gd 1/1 Approximant
Autorzy:: Hars, S.
Sharma, H.
Smerdon, J.
Yadav, T.
Tamura, R.
Shimoda, M.
McGrath, R.
Powiązania:: https://bibliotekanauki.pl/articles/1203006.pdf
Data publikacji:: 2014-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.44.Br
68.35.Bs
68.37.Ef
71.23.Ft
Opis:: Scanning tunneling microscopy is employed to characterise the structure and morphology of the (100) surface of the Ag-In-Gd 1/1 approximant. The surface prepared by the usual method of sputter-annealing produces step-terrace structure. Observed step heights are consistent with the lattice constant of the bulk. Scanning tunneling microscopy on terraces reveals cluster-like protrusions arranged with a square unit cell as expected from the bulk. It has not been possible to assign the terraces to the specific bulk planes because of lack of atomic resolution on terraces.
Źródło:: Acta Physica Polonica A; 2014, 126, 2; 479-481
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Leaching of Al-Based Polygrain Quasicrystalline and Related Crystalline Surfaces
Autorzy:: Yadav, T.
Mishra, S.
Pandey, S.
Singh, D.
Lowe, M.
Tamura, R.
Mukhopadhyay, N.
Srivastava, O.
McGrath, R.
Sharma, H.
Powiązania:: https://bibliotekanauki.pl/articles/1373698.pdf
Data publikacji:: 2014-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.44.Br
81.16.Hc
61.66.Dk
68.37.Hk
Opis:: In the present investigation, we have studied leaching on polygrain Al-based quasicrystalline $(i-Al_{63}Cu_{25}Fe_{12})$ as well as crystalline (B2 phase; $Al_{55}Cu_{30}Fe_{15})$ alloy surfaces using a 10 mole NaOH solution. The surface was leached at varying times from 30 min to 8 h and subsequently characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray analysis. Leaching of the samples for 30 min generated a homogeneous layer. However further leaching for 1-8 h yielded nano-size particles on the surface. Spherical microstructure has been observed on the Al-Cu-Fe crystalline surface whereas on the quasicrystalline surface a petal-like microstructure appeared. The implications of the evolution of different microstructures in the context of structure, stability and activity are discussed. The results are compared with the microstructure of leached polygrained samples containing a mixture of different surface orientations.
Źródło:: Acta Physica Polonica A; 2014, 126, 2; 629-632
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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