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    Wyświetlanie 1-6 z 6
    Tytuł:
    Theoretical Study of the Effect of Light on Nematic to Isotropic Phase Transition
    Autorzy:
    Suresha, B.
    Radhakrishna, M.
    Govind, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493611.pdf
    Data publikacji:
    2011-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.30.-v
    64.70.M-
    Opis:
    Optical response of liquid crystals is very important from the point of view of applications of liquid crystals in display and data storage devices. Experiments have shown that UV rays incident on nematic liquid crystals doped with photoactive azo compounds lower the nematic isotropic transition temperature $(T_{NI})$. This is attributed to the transformation of photoactive trans isomer to cis isomer due to UV rays. We have earlier developed a mean field model involving molecular explanation for two lengths in which the mutual orientation of near neighbor molecules changes from an antiparallel to a parallel configuration as the temperature lowered. In this paper, this model is extended to include the length change from trans to cis isomer. The calculated values of change in $T_{NI}$ qualitatively agree with experimental trends.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 3; 462-467
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Visible Light Irradiation on Positronium Formation in Polyethylene at Low Temperature
    Autorzy:
    Ito, Y.
    Hirade, T.
    Hamada, E.
    Suzuki, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2007996.pdf
    Data publikacji:
    1999-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    Opis:
    The effect of visible light exposing on the ortho-positronium formation in polyethylene was studied. Lifetime spectra of positrons in polyethylene were measured in the temperature range between 50 K and 370 K. It was observed that the visible light quenches the enhancement of ortho-positronium intensity (I$\text{}_{3}$) at lower temperature than ca. 250 K - the glass transition temperature of polyethylene. On the other hand, the lifetime of ortho-positronium component (τ$\text{}_{3}$) was not affected by the presence of the visible light.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 4; 533-538
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Laser Light Ellipticity on Hanle Electromagnetically Induced Absorption Amplitude and Line Width
    Autorzy:
    Dimitrijević, J.
    Grujić, Z.
    Mijailović, M.
    Arsenović, D.
    Panić, B.
    Jelenković, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1815474.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Gy
    32.70.Jz
    Opis:
    Using the $\text{}^2S_{1//2}$ $F_g$=2→$\text{}^2P_{3//2}$ $F_e$=3 transition in $\text{}^{87}Rb$, we analyzed the interaction between the arbitrarily polarized laser light and Zeeman sublevels in the Hanle configuration. We studied theoretically and confirmed experimentally that the effect of the laser light polarization on the electromagnetically induced absorption strongly depends on the laser light power. For the same atomic transition, and for single laser light power (3 mW), it was recently shown that electromagnetically induced absorption line widths increase with polarization ellipticity and that electromagnetically induced absorption amplitude has maximum for certain laser light polarization different than linear. Here, we present results for amplitudes and widths of electromagnetically induced absorption for different laser light polarizations and for the laser light power≤ 200μW. It is verified that for small laser light power maximal electromagnetically induced absorption amplitude is for the linear polarization, whereas for larger power maximum of the electromagnetically induced absorption is at higher polarization ellipticity.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 841-845
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Dimple Potential on Ultraslow Light in a Bose-Einstein Condensate
    Autorzy:
    Tarhan, D.
    Uncu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490935.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.50.Gy
    67.85.Hj
    Opis:
    We investigate the propagation of ultraslow optical pulse in atomic Bose-Einstein condensate in a harmonic trap decorated with a dimple potential. The role of dimple potential on the group velocity and time delay is studied. Since we consider the interatomic scattering interactions, nonlinear Schrödinger equation or the Gross-Pitaevskii equation is used in order to get the density profile of the atomic system. We find large group delays of order 1 ms in an atomic Bose-Einstein condensate in a harmonic trap with a deep dimple potential.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1; 141-143
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of the Red Light on Reactive Oxygen Species Production by Neutrophils in Vitro
    Autorzy:
    Nawrocka-Bogusz, H.
    Jaroszyk, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1490445.pdf
    Data publikacji:
    2012-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.50.W-
    87.17.-d
    82.30.Cf
    Opis:
    The aim of this study was to investigate the effect of the red light (630 nm) upon reactive oxygen species production by neutrophils in vitro. Blood samples were used for the study. The flow cytometry method was used for estimation of hydrogen peroxide production. A statistically significant decrease of reactive oxygen species production by neutrophils was observed. The level of the decrease varied and it was dependent on the kind of spectrum of applied signals and different levels of energy light.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 1A; A-057-A-060
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetochiral Effect in H$\text{}_{h}$ and V$\text{}_{h}$ Components of Rayleigh Light Scattering by Diamagnetic Molecular Systems
    Autorzy:
    Woźniak, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028894.pdf
    Data publikacji:
    2001-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.15.Kr
    33.20.Fb
    33.55.-b
    78.20.Ls
    Opis:
    A static magnetic field B$\text{}^{0}$, acting on a chiral liquid perpendicular to the propagation direction of an optical beam, is shown to induce a magnetochiral change of Rayleigh light scattering which is different in sign for the light scattered parallel and antiparallel to B$\text{}^{0}$. It is related to the electric dipole and magnetic dipole or/and electric quadrupole moments induced simultaneously in a chiral molecule by electric dipole interaction with electromagnetic radiation. For diamagnetic molecules the effect is described by linear and nonlinear polarizabilities, responsible also for circular birefringence (natural optical activity and the Faraday effect) as well as axial (magnetochiral) birefringence.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 4; 517-528
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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