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    Wyświetlanie 1-4 z 4
    Tytuł:
    Cosmic future of nuclear and particle physics
    Autorzy:
    Wrochna, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/147930.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    astronomy
    nuclear physics
    particle physics
    astroparticle physics
    Opis:
    Abstract Astronomy and nuclear or particle physics are often considered as two opposite extremes, but in fact their common part is not empty and still enlarging. In this brief review we trace their common roots and we look for their common future. We predict that soon they will de facto merge in terms of phenomena being studied, theories used to describe them as well as experimental techniques. We gave several examples, devoting special attention to the "Pi of the Sky" project searching for optical flashes of astrophysical origin.
    Źródło:
    Nukleonika; 2005, 50,suppl.3; 25-31
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gamma-ray computed tomography as a tool to evaluate porosity changes along depth for surface crusted soils
    Autorzy:
    Pires, L. F.
    Bacchi, O. O. S.
    Reichardt, K.
    Dias, N. M. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/146838.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gamma-ray attenuation
    soil density
    soil structure
    soil surface sealing
    241 Am
    applied nuclear physics
    gamma tomography
    Opis:
    Assessment of changes in porosity (ö) along depth for soils with surface crusting is difficult because conventional soil physical investigation tools are destructive and usually require a long period of time for preparation and analysis of the samples. Computed tomography (CT) has frequently been used as a method to evaluate soil structure in a nondestructive, sensitive, and rapid manner. CT data can be used for measuring at a millimetric scale changes in ö along depth for soils with surface crusting. The main objective of this work was to investigate the sensibility of the gamma-ray CT to assess soil structural changes along depth in samples presenting structural crust. CT images were taken with a first generation scanner of 1.14 mm resolution along eight different soil layers within the 0 28 mm depth. Porosity increased along depth up to the 14 17.5 mm layer. Through the analysis of the ö distribution of each layer it was possible to show that the sealed surface layer presented ö values of approximately 30%, while the other layers were greater than 30% up to 60% (macropore regions). The sealing crust thickness was estimated to be in the range of 2.3 3.5 mm.
    Źródło:
    Nukleonika; 2007, 52, 3; 125-131
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stable Bose-Einstein correlations
    Autorzy:
    Csörgo, T.
    Hegyi, S.
    Zajc, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/147334.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    particle correlations
    Bose-Einstein correlations
    HBT
    Lévy distributions
    multiparticle production in high energy particle and nuclear physics
    Opis:
    The shape of Bose-Einstein (or HBT) correlation functions is determined for the case when particles are emitted from a stable source, obtained after convolutions of large number of elementary random processes. The two-particle correlation function is shown to have a stretched exponential shape, characterized by the Lévy index of stability 0 < alfa less-than or equal to 2 and the scale parameter R. The normal, Gaussian shape corresponds to a particular case, when alfa = 2 is selected. The asymmetry parameter of the stable source, beta is shown to be proportional to the angle, measured by the normalized three-particle cumulant correlations.
    Źródło:
    Nukleonika; 2004, 49,suppl.2; 7-10
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Warsaw cyclotron: present status and plans of development
    Autorzy:
    Choiński, J.
    Czosnyka, T.
    Dworski, J.
    Jastrzębski, J.
    Kownacki, J.
    Kulczycka, E.
    Kurzyński, J.
    Miszczak, J.
    Stolarz, A.
    Sudlitz, K.
    Sura, J.
    Zemło, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/148689.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    accelerators physics
    cyclotrons
    application of cyclotron in nuclear
    atomic and solid state physics
    Opis:
    The operation of the Warsaw heavy ion cyclotron is presented. Technical solutions adopted were intended to accommodate the needs of different groups of users requiring a wide scope of beam species and energies. The accelerating structure of the machine, with two 45 degree dees, allows for the operation in the harmonics modes from 2 to 6 (first harmonic mode is also possible, although the acceleration of protons and deuterons is currently not within the scope of interest). Available energies range from 2 to about 10 MeV/amu due to the wide range of the stripping extraction system. Development of the multiturn stripping extraction technique was necessary to achieve the flexibility in energy variation, otherwise not reachable due to the highly saturated iron structure, which makes impossible the change of magnetic field and radio-frequency within the desirable limits. At present, the cyclotron, equipped with the ECR ion source, is capable of delivering ion beams from gaseous media up to Ar. Available ion beam species, their energies and intensities obtained up-to-date are shown. An overview of the experiments performed on the Warsaw cyclotron, including basic nuclear physics research, solid state physics and materials science, is intended to demonstrate the potential of the facility. The efficiency of the cyclotron and the ion beam line optics is discussed, as well as the plans for the future upgrade of the cyclotron and its infrastructure.
    Źródło:
    Nukleonika; 2003, 48,suppl.2; 109-115
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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