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Wyszukujesz frazę "Singh, P. P." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Third-Order Nonlinear Optical Properties and Reverse Saturable Absorption in 2,3-Butanedione Dihydrazone Using z-Scan Technique
    Autorzy:
    Singh, V.
    Aghamkar, P.
    Lal, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400281.pdf
    Data publikacji:
    2013-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.65.-k
    42.70.Mp
    42.70.Nq
    Opis:
    Using chemical route a 2,3-butanedione dihydrazone (BDDH) compound was prepared. The third-order nonlinear optical properties of BDDH were investigated by using single beam z-scan technique with Q-switched, frequency doubled Nd:YAG laser (λ = 532 nm) at 5 ns pulse. Effect of excitation intensity on nonlinear optical properties has been studied and found that experimental and computed values are well in agreement. Also, we found the measured nonlinear optical coefficients are nearly ten times larger than the reported. The excited state absorption cross-section of BDDH was found to be larger than that of the ground state absorption cross-section, indicating the reverse saturable absorption.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 1; 39-44
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical Shift of X-Ray K-Absorption Edge of Ni in Some of its Compounds and its Correlation with Partial Charge
    Autorzy:
    Singh, V. K.
    Chetal, A. R.
    Sarode, P. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933455.pdf
    Data publikacji:
    1995-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    Opis:
    X-ray absorption Ni K-edge spectra are recorded for the following systems: Ni metal, Ni(NO$\text{}_{3}$)$\text{}_{2}$ • 6H$\text{}_{2}$0, Ni$\text{}_{3}$(PO$\text{}_{4}$)$\text{}_{2}$ • 6H$\text{}_{2}$0, NiSO$\text{}_{4}$ • 6H$\text{}_{2}$0, NiCO$\text{}_{3}$, NiO and La$\text{}_{2}$NiO$\text{}_{4}$ using a Cauchois-type bent crystal spectrograph. The chemical shift of these systems is correlated with the partial charge determined using Sanderson's method. On the basis of regression analysis a relation ΔE = A$\text{}_{0}$ + A$\text{}_{1}$q + A$\text{}_{2}$q$\text{}^{2}$ -A$\text{}_{3}$q$\text{}^{3}$ + A$\text{}_{4}$q$\text{}^{4}$ between the chemical shift, ΔE, and the partial charge, q, has been suggested. The discrepancy in the shift of NiO and La$\text{}_{2}$NiO$\text{}_{4}$ has also been discussed.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 6; 1003-1008
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of van Hove Singularity on T$\text{}_{c}$ in Rb doped C$\text{}_{60}$
    Autorzy:
    Agrawal, B. K.
    Agrawal, S.
    Yadav, P. S.
    Srivastava, P.
    Srivastava, R.
    Singh, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2035748.pdf
    Data publikacji:
    2003-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Jb
    74.62.Fj
    74.70.Wz
    Opis:
    In the present study we investigate the role of van Hove singularity on the optimization of T$\text{}_{c}$ in Rb doped fullerenes C$\text{}_{60}$ Rb$\text{}_{3}$. A first principles self-consistent full potential linear muffin-tin orbital method using density functional theory in local density approximation was employed. The doped Rb atoms are of two types occupying the tetrahedral and interstitial positions in the fcc lattice. The added Rb atoms fill the t$\text{}_{1u}$ band of the undoped fullerenes C$\text{}_{60}$ up to half which makes C$\text{}_{60}$Rb$\text{}_{3}$ conducting. Saddle points leading to van Hove singularities are observed in the neighbourhood of the symmetry point L. The shifting of the van Hove singularity with the volume of the lattice is investigated. We observe a saddle point just at the Fermi level for a lattice constant of 14.435Å. The highest value of T$\text{}_{c}$ should thus be observed at the above lattice constant. This result is in excellent agreement with the observed high value of T$\text{}_{c}$ measured in C$\text{}_{60}$Rb$\text{}_{3}$ for a lattice constant of 14.435Å.
    Źródło:
    Acta Physica Polonica A; 2003, 103, 5; 477-482
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Volumetric, Optical, Acoustical and Viscometric Study of Molecular Association in Binary Mixtures of Butylamine with 1-Butanol and Tert-Butanol
    Autorzy:
    Singh, S.
    Parveen, S.
    Shukla, D.
    Gupta, M.
    Shukla, J. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047348.pdf
    Data publikacji:
    2007-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.35.+d
    62.60.+v
    82.60.Lf
    Opis:
    Density (ρ), refractive index (n), ultrasonic velocity (u), and viscosity (η) were measured for the binary mixtures formed by butylamine with 1-butanol and tert-butanol at temperatures 293, 303, and 313 K over the entire composition range. Excess molar volume V$\text{}_{m}^{E}$, molar refraction deviation ΔR$\text{}_{m}$, deviation in ultrasonic velocity Δu, viscosity deviation Δη, and excess Gibb's free energy of activation for viscous flow ΔG$\text{}^{*E}$ were derived from the experimental data and the computed results were fitted to the Redlich-Kister polynomial equation. The values of V$\text{}_{m}^{E}$, ΔR$\text{}_{m}$, Δu, Δη, and ΔG$\text{}^{*E}$ were plotted against the mole fraction of butylamine. The observed positive and negative values of excess parameters for both the mixtures were explained on the basis of intermolecular interactions present in these mixtures. The higher negative values of V$\text{}_{m}^{E}$ and ΔR$\text{}_{m}$ and positive values of Δu, Δη, and ΔG$\text{}^{*E}$ for butylamine + 1-butanol mixture suggest that specific interactions are taking place in butylamine + 1-butanol mixture, while weak dipole-dipole induced forces and dispersive forces seem to be responsible for butylamine + tert-butanol mixture. Furthermore, different empirical relations were used to correlate the binary refractive indices. An excellent agreement was found between experimental and theoretical values.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 6; 847-858
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Refractive Indices, Order Parameter and Optical Transmittance Studies of a Nematic Liquid Crystal Mixture
    Autorzy:
    Singh, A. K.
    Manohar, R.
    Shukla, J. P.
    Biradar, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047089.pdf
    Data publikacji:
    2006-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.-v
    42.70.Df
    Opis:
    Measurements of ordinary refractive index, birefringence, density, and order parameter were made on a technologically important nematogen and the data obtained for its nematic and isotropic phase were reported. A modified wedge method was used for the measurement of the birefringence (δ n). The nematic-isotropic phase transition temperature matches very well as is exhibited from the value of refractive indices and densities obtained using different techniques. The optical anisotropy and density data were used to determine the order parameter and principal polarizability of the nematic mixture using the Vuks approach and their temperature dependence was discussed. The macroscopic order parameter was obtained and compared with microscopic order parameter. These two values agree very well.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 4; 485-493
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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