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    Wyświetlanie 1-8 z 8
    Tytuł:
    Influence of Configuration Interaction on the Magnetic Circular Dichroism Spectra of C$\text{}_{60}$ Molecule
    Autorzy:
    Pilch, M.
    Pawlikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929816.pdf
    Data publikacji:
    1993-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.55.Be
    Opis:
    A$\text{}_{1}$/D$\text{}_{0}$ and D$\text{}_{0}$ characteristics of magnetic circular dichroism and absorption spectra are studied for the low-energy A$\text{}_{g}$ → T$\text{}_{1u}$ transitions in the C$\text{}_{60}$ molecule in terms of the self-consistent field Parieser-Parr-Pople method applied in the full configuration interaction-1 treatment. The effects are discussed at different levels of configuration interaction and the results are compared to the earlier ones obtained From the CNDO/S method. We argue that the earlier treatment fails to account correctly for the experimental magnetic circular dichroism and absorption spectra of C$\text{}_{60}$ molecule. This is most probably due to deficiency of the configuration interaction basis set and/or to the intrinsic parametrization of complete neglect of differential overlap method.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 6; 1049-1054
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Circular Dichroism Study of the Light-Harvesting PCP Complexes Within the Vibronic Multistate Dimer Theory
    Autorzy:
    Pilch, M.
    Pawlikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1887493.pdf
    Data publikacji:
    1991-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.55.Ad
    33.10.Lb
    Opis:
    Chiral properties of peridinin-chlorophyll-protein (PCP) light-harvesting complexes are studied in terms of vibronic dimer theory previously applied to study certain structural aspects of α-crustacyanin pigments. On the base of CD spectra it is shown that the peridinin dimer acts as a chiral group in PCP complexes and its geometrical structure is such that the peridinin monomers cannot be coplanar. Certain observations concerning the energy transfer process in PCP complexes in vivo are also made.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 5; 619-626
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jahn-Teller and Herzberg-Teller Couplings in Absorption and Magnetic Circular Dichroism Spectra of (E+E)∗e Systems
    Autorzy:
    Pilch, M.
    Pawlikowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1920742.pdf
    Data publikacji:
    1992-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.10.Lb
    33.55.Be
    Opis:
    Model calculations are reported for an (E+E)∗e system including linear and quadratic Jahn-Teller and Herzberg-Teller vibronic interactions. The effects of these interactions on magnetic circular dichroism and absorption spectra are compared with experimental observations on CoF$\text{}^{3-}$$\text{}_{6}$ salts.
    Źródło:
    Acta Physica Polonica A; 1992, 81, 6; 619-627
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Application of Double-layer Curtains for Shaping Acoustics of Concert Halls
    Autorzy:
    Pilch, A.
    Karlińska, A.
    Snakowska, A.
    Kamisiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1196822.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.55.-n
    43.55.Dt
    43.58.-e
    Opis:
    Requirements concerning adjustment of acoustical parameters are nowadays more and more frequently numbered among design assumptions adopted for newly constructed concert halls and other auditoriums planned to play different functions. Investors usually require that the newly designed interiors can be used for such different purposes as playing orchestral music, performing theatre spectacles, screening movies, or holding lectures. This means the necessity to undertake studies on new technologies allowing to excert effective control over acoustics of multipurpose auditoriums. This paper proposes to use acoustic curtains as an effective means of modification of acoustic absorptivity of rooms. A design solutions for such curtains is described together with basics of the theory allowing to predict their acoustic properties. Results of sound absorption coefficient calculations performed for selected systems on the grounds of airflow resistivity values assumed for the used fabrics are verified by means of results of measurements performed in the impedance tube. It is proven that double-layer curtains show more balanced sound absorption characteristics compared to single-layer curtains and therefore represent a more convenient option when used for acoustical adaptation of rooms. Based on model studies, design solutions with double-layer curtains is developed for two concert halls that allow to adjust acoustic properties of the interiors to the required functions.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4A; A-113-A-116
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Study of Sound Scattering Structures for the Purposes οf Room Acoustic Enhancement
    Autorzy:
    Kamisiński, T.
    Rubacha, J.
    Pilch, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537465.pdf
    Data publikacji:
    2010-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.20.Fn
    43.55.Br
    43.58.+z
    Opis:
    Acoustic structures are currently classified mainly in terms of their acoustic absorption and insulation properties. Knowing the sound scattering parameter can significantly improve the useful value of materials and identify their best applications. Currently no studies are performed in Poland on the sound scattering coefficients of materials. This is due to a complex measurement procedure and a lack of legal requirements. The authors have attempted to make such measurements on the basis of the standard ISO 17497-1:2004: Acoustics - Sound-scattering properties of surfaces - Part 1: Measurement of the random-incidence scattering coefficient in a reverberation room. Measurement and calculation methods are presented, and problems encountered during this study have been described. This issue is of particular importance, especially in the acoustic design of interiors.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 1; 83-86
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlling Structural and Functional Features of Photosynthetic Antenna
    Autorzy:
    Fiedor, L.
    Fiedor, J.
    Pilch, M.
    Susz, A.
    Tworzydło, J.
    Michalik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419488.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.15.nr
    87.15.Cc
    87.64.ks
    Opis:
    In order to gain control over the assembly and functioning of photosynthetic antenna, we have developed methods to manipulate pigment composition of bacterial LH1 complexes via their reconstitution with modified bacteriochlorophylls or carotenoids, major photoactive cofactors of these antennae. In the present work we show how the reconstitution and pigment exchange approach is applied to control structural and functional parameters of LH1 and its subunits. The size of the subunits and the energy of the first excited singlet state can be controlled via the use of detergent while the thermodynamics of LH1 formation can be modified using carotenoids and/or a co-solvent. Carotenoids affect the efficiency of the intracomplex energy transfer, while the replacement of native bacteriochlorophyll a with its Ni-substituted analog allows one to control the excited state properties of LH1. These results show that LH1 is a very promising model system applicable for the design of bio-inspired device performing solar energy conversion.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 255-258
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Pressure and Intensity Methods in Evaluating the Directional Diffusion Coefficient
    Autorzy:
    Pilch, A.
    Kamisiński, T.
    Zastawnik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400088.pdf
    Data publikacji:
    2013-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.55.-n
    43.55.Ka
    43.55.Mc
    43.20.Ei
    Opis:
    The directional diffusion coefficient characterizes directional uniformity of acoustic energy reflected from a structure. The goal of the paper is to check whether different measurement methods of that coefficient give comparable results and can be used for different diffusing structures. ISO 17497-2:2012 recommends two basic measurement methods for this parameter, both based on sound pressure analysis. In the first method, one microphone and a measurement manipulator is used (the space method), while in the second one, 19 microphones placed on the sound-reflecting plane are required (the boundary method). In the standard it is assumed (as usually in the room acoustics), that the acoustic energy is proportional to the square of sound pressure, what is true only for the plane wave. Correctness of this assumption was checked by the modified space method where the sound intensity probe was installed instead of microphone. The test revealed that pressure methods gave comparable results for both low- and high-diffusion structures, with the boundary method giving moderately higher values for low-diffusion structures and slightly higher for high-diffusion structures. The results obtained in the intensity method were comparable with the pressure method except for the 2000 Hz frequency range.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 6; 1054-1058
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neutron Diffraction Study and Deformation Behavior of a Composite Based Mg Alloy Reinforced by Short Saffil Fibers
    Autorzy:
    Farkas, G.
    Máthis, K.
    Pilch, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402148.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.64.Bx
    88.30.mj
    61.72.Hh
    Opis:
    In the present work neutron diffraction has been applied for ex situ investigation of residual stresses in Mg-4%Al-1%Ca (AX41) magnesium alloy reinforced with short Saffil fibers. Samples were deformed in compression at room temperature. Two types of fiber arrangement were investigated. In both samples the fibers were homogeneously distributed and arranged in parallel planes with a random fiber orientation. In the first sample these planes were parallel with the loading axis and in the second one they were perpendicular to the loading direction. Significant dependence of both the mechanical properties and residual strains on the fibers orientation was observed. Sample with parallel fiber arrangement showed higher hardness and lower ductility. Further the increment of residual tensile lattice strain in the matrix with a macroscopic deformation is much higher than in the other case. It was found that the residual strain evolution strongly depends on the orientation of grains in the matrix.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 758-761
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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