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    Wyświetlanie 1-5 z 5
    Tytuł:
    On Surface Waves in Materials with Negative Poisson Ratio
    Autorzy:
    Zieliński, P.
    Twaróg, D.
    Trzupek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1808576.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Opis:
    True surface wave, i.e. a resonance with infinite lifetime is found within a bulk band in a model of thin planar layer coating a continuous auxetic substrate. Conditions for the existence of this wave are given.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 513-515
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress Induced Phononic Properties and Surface Waves in 2D Model of Auxetic Crystal
    Autorzy:
    Trzupek, D.
    Twaróg, D.
    Zieliński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1809972.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.D-
    68.35.Ja
    62.20.dj
    Opis:
    Elastic stiffness parameters are determined in a 2D model system of rigid rods interacting by harmonic force constants. Any positive ("normal" crystal) or negative (auxetic crystal) Poisson ratio can be obtained in this model as a function of the external stress. Conditions for opening an absolute stop band (phononic crystal) and for various kinds of surface waves are obtained.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 576-578
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Dynamics and Phononic Properties of 2D Field Tunable Auxetic Crystal
    Autorzy:
    Twaróg, D.
    Trzupek, D.
    Zieliński, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1810018.pdf
    Data publikacji:
    2009-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.D-
    68.35.Ja
    62.20.dj
    Opis:
    The lattice in-plane dynamics is studied as a function of external field in a model of auxetic crystal consisting of rigid polar rods and of elastic springs. The phase speed of the transverse acoustic wave propagating parallel to the polar rods is shown to be higher than the speed of the longitudinal wave at strong fields. An absolute stop band for the lattice waves opens in the whole Brillouin zone with increasing field. The surface waves and resonances at a surface parallel to the rods are studied. Infinitely narrow resonances called exceptional surface waves are found within bulk bands at certain specific values of the parameters characterizing the surface. Generally, the surface layer should be significantly heavier and stiffer than the substrate for the phenomenon to occur.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 2; 579-582
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emission Measurements of Geogenic Greenhouse Gases in the Area of “Pusty Las” Abandoned Oilfield (Polish Outer Carpathians)
    Autorzy:
    Guzy, P.
    Pietrzycki, D.
    Świerczewska, A.
    Sechman, H.
    Twaróg, A.
    Góra, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/124987.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    greenhouse gas
    methane
    carbon dioxide
    Outer Carpathians
    Opis:
    The Carpathians may play a significant role as a supplier of greenhouse gases to the atmosphere. Unfortunately, most of the discovered oil and gas deposits are recently only historical objects. An example is the Sękowa-Ropica Górna-Siary oil deposit located in the marginal part of the Magura Nappe where oil had been extracted in dug wells until the mid XX century. One of such extraction sites is the “Pusty Las” oilfield. In that area, 10 methane and carbon dioxide emission measurement sites were located, among which 4 in dried dug wells and 6 in dig wells still filled with oil and/or water. Dynamics of methane and carbon dioxide concentration changes were measured with the modified static chambers method. Gas samples were collected immediately after the installation of the chamber and again, after 5 and 10 minutes. In the case of reclaimed or dry dug wells, static chamber was installed directly at the ground surface. In wells still filled with oil and/or water the chamber was equipped with an “apron” mounted on special sticks. The dynamics of concentrations changes varied from -0.871 to 119.924 ppm∙min-1 for methane and from -0.005 to 0.053% obj∙min-1 for carbon dioxide. Average methane emission was 1.9 g∙m-2∙d-1 and that of carbon dioxide was 26.95 g∙-2∙d-1. The measurements revealed that an abandoned oil field supplies significant amounts of greenhouse gases to the atmosphere although the emission of methane is lower than that measured e.g. in mud volcanoes located in various parts of the world.
    Źródło:
    Journal of Ecological Engineering; 2017, 18, 4; 100-109
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Light to Heavy Nuclear Systems, Production and Decay of Fragments Studied with Powerful Arrays
    Autorzy:
    Casini, G.
    Morelli, L.
    Barlini, S.
    Piantelli, S.
    D'Agostino, M.
    Baiocco, G.
    Marchi, T.
    Abbondanno, U.
    Ademard, G.
    Appannababu, S.
    Bini, M.
    Bonnet, E.
    Borderie, B.
    Bougault, R.
    Bruno, M.
    Chbihi, A.
    Cinausero, M.
    Degerlier, M.
    Fabris, D.
    Frankland, J.
    Gelli, N.
    Gramegna, F.
    Gruyer, D.
    Gulminelli, F.
    Kordyasz, A.
    Kozik, T.
    Kravchuk, V.
    Kulig, P.
    Le Neindre, N.
    Lopez, O.
    Maurenzig, P.
    Olmi, A.
    Pasquali, G.
    Pârlog, M.
    Poggi, G.
    Rivet, M.
    Rosato, E.
    Sosin, Z.
    Spadaccini, G.
    Stefanini, A.
    Twarog, T.
    Valdrè, S.
    Vient, E.
    Raduta, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402639.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    25.70.Gh
    25.70.Pq
    25.70.Mn
    29.40.-n
    Opis:
    Reactions between heavy-ions at various energy regimes produce many nuclear fragments which can be populated in highly excited states. The study of these fragments, detected at the end of their particle decay, is important to investigate nuclear forces and structure effects. In recent years there have been many efforts to extend these studies towards the drip-lines, i.e. to systems far from the β-stability valley, by using accelerated radioactive beams. The development of such infrastructures is accompanied by the development of more powerful detectors and associated electronics, capable to identify ions with very different sizes and kinetic energies. Here we give two examples which show how advanced arrays can contribute to the studies on nuclear phenomena. The examples come from the European FAZIA collaboration and from recent campaigns with the GARFIELD apparatus, the latter in operation at the INFN Legnaro Laboratory (Italy) where the SPES RIB facility is under construction.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1548-1551
    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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