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Wyszukujesz frazę "Tyagi, V." wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Road Traffic Noise Attenuation by Vegetation Belts at Some Sites in the Tarai Region of India
    Autorzy:
    Tyagi, V.
    Kumar, K.
    Jain, V. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/950218.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    noise
    attenuation
    traffic
    frequency
    vegetation belt
    Tarai
    Opis:
    Noise measurements have been carried out at eleven different sites located in three prominent cities of the Tarai region of India to evaluate the effectiveness of vegetation belts in reducing traffic noise along the roadsides. Attenuation per doubling of distance has been computed for each site and excess attenuation at different 1/3 octave frequencies has been estimated. The average excess attenuation is found to be approximately 15 dB over the low frequencies (200 Hz to 500 Hz) and between 15 dB to 20 dB over the high frequencies (8 kHz to 12.5 kHz). Over the critical middle frequencies (1-4 kHz), the average excess attenuation (between 10-15 dB) though not as high, is still significant, with a number of sites showing an excess attenuation of 15 dB or more at 1 kHz. The results indicate that sufficiently dense vegetation belts along the roadsides may prove as effective noise barriers and significant attenuation may be achieved over the critical middle frequencies (1-4 kHz).
    Źródło:
    Archives of Acoustics; 2013, 38, 3; 389-395
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rotational excitation of diatomic molecule: time dependent study
    Autorzy:
    Maan, A.
    Tyagi, A.
    Prasad, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1050796.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    collision
    rotational excitation
    probabilities
    impact parameter
    collisional velocity
    Opis:
    Recent experimental evidences have prompted us to study the dynamics of laser-assisted rotational excitation of a diatomic molecule due to an ion impact. The collision time between the ion and the molecule is very small (few atomic units) and the laser pulses considered are of picosecond range. We study the evolution of the rotational probabilities by varying the various laser parameters (pulse shape, field strength, pulse width, frequency) and collision parameters (impact parameter b, collisional velocity v). It is found that the probabilities of the rotational states depend strongly on the laser pulse parameters and the collision parameters. The study is more emphasised by studying ⟨J^{2}⟩ (a parameter defining the extent of the rotational excitation) and ⟨J_{z}⟩ for the system under concern. For higher value of b, the maximum value obtained by ⟨J^{2}⟩ increases and vice versa. Also, the molecule enters the transient mode for large b and v.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1266-1273
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Morphology and Magnetic Coupling in ZnO:Co and ZnO:Ni Co-Doped with Li
    Autorzy:
    Persson, C.
    Jayakumar, O.
    Sudakar, C.
    Sudarsan, V.
    Tyagi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505447.pdf
    Data publikacji:
    2011-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Nr
    71.55.Gs
    75.50.-y
    Opis:
    $Zn_{0.95}Co_{0.05}O$ and $Zn_{0.97}Ni_{0.03}O$ nanorods, prepared by a solvothermal method, show intriguing morphology and magnetic properties when co-doped with Li. At low and moderate Li incorporation (below 10 and 3 at.% Li in the Co- and Ni-doped samples, respectively) the rod aspect ratio is increased and room temperature ferromagnetic properties are enhanced, whereas the ferromagnetic coupling in $Zn_{0.97}Ni_{0.03}O$ is decreased for Li concentrations < 3 at.%. First-principles theoretical analyses demonstrate that Li co-doping has primarily two effects in bulk $Zn_{1- x}M_{x}O$ (with M = Co or Ni). First, the Li-on-Zn acceptors increase the local magnetic moment by depopulating the M 3d minority spin-states. The magnetic coupling is Ruderman-Kittel-Kasuya-Yosida-like both without and with Li co-doping. Second, Li-on-Zn prefer to be close to the M atoms to compensate the M-O bonds and to locally depopulate the 3d states, and this will help forming high aspect nanostructures. The observed room temperature ferromagnetism in Li co-doped $Zn_{1- x}M_{x}O$ nanorods can therefore be explained by the better rod morphology in combination with ionizing the magnetic M atoms.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 2; 95-98
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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