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    Wyświetlanie 1-5 z 5
    Tytuł:
    Fast Neutron Activation Analysis of gold by inelastic scattering, 197Au(n,ngamma)197Aum, by means of Plasma Focus device
    Autorzy:
    Verri, G.
    Mezzetti, F.
    Da Re, A.
    Rapezzi, L.
    Gribkov, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/146754.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    activation
    gold
    neutron
    plasma focus
    Opis:
    The application of a Fast Neutron Activation Analysis (FNAA) technique on samples of pure gold, irradiated by a plasma focus of 7 kJ, has been investigated. The reaction was the inelastic scattering of neutrons, 197Au(n,n'gamma)197Aum. To avoid problems connected with peculiar features of the neutron emission from this kind of source, a preliminary standardisation of the method has been carried out. The results obtained have a practical interest in view of possible applications to the technology of extraction of minerals.
    Źródło:
    Nukleonika; 2000, 45, 3; 189-191
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An internal standard for Fast Neutron Activation Analysis spectra obtained by means of Plasma Focus devices
    Autorzy:
    Verri, G.
    Tartari, A.
    Rapezzi, L.
    Mezzetti, F.
    Gribkov, V. A.
    Da Re, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147122.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    gold
    inelastic scattering
    lead
    mineral resources
    NAA
    plasma focus
    Opis:
    The behaviour of Pb activation peaks, which appear in an X-ray spectrum of Fast Neutron Activation Analysis (FNAA) performed by means of a Plasma Focus (PF) neutron source and an NaI scintillator counter, has been studied. The PF device generates neutron bursts of different intensities. To know the exact neutron flux illuminating a sample during PF discharges an external neutron counter is usually used. The nature and behaviour of the indicated peaks suggest that one could use one of them as an internal standard for neutron production measurement instead of an external counter. This technique allows more reliable and accurate determinations of the presence of various elements.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 103-105
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary study on X-ray source from Plasma Focus device for fast radiography
    Autorzy:
    Da Re, A.
    Mezzetti, F.
    Tartari, A.
    Verri, G.
    Rapezzi, L.
    Gribkov, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/147243.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    X-ray sources
    Opis:
    Plasma derived flash X-ray sources may find potential applications in medicine and industry. Notwithstanding, as is the case of Plasma Focus (PF) devices, their characterisation in term of photon energy, temporal and spatial beam stability is far to be considered satisfactory. In this work, a radiographic approach, which avoids the effects caused by the intrinsic instability of the pinch output of a PF machine, is proposed and an attenuation curve can be attained even in presence of Xray emission instability. Using two radiographic films for each shot exposition symmetrically positioned and collimated to the pinch region the mean energy of the photons in the X-ray beam are evaluated. The X-ray emission symmetry from the pinch region was then utilised to control the validity of the proposed methodology.
    Źródło:
    Nukleonika; 2001, 46, suppl. 1; 123-125
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of diagnostic tools for Plasma Focus derived X-ray source
    Autorzy:
    Angeli, E.
    Bonifazzi, C.
    Da Re, A.
    Marziani, M.
    Tartari, A.
    Frignani, M.
    Mannucci, S.
    Mostacci, D.
    Rocchi, F.
    Sumini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147434.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    plasma focus
    electron impact ionization
    characteristic X-ray lines
    bremsstrahlung
    material heating
    dosimetry
    Opis:
    The energy spectra of X-rays generated by the impact of electron beams on high- and medium-Z targets following the pinch implosion of Plasma Focus (PF) devices are discussed in terms of the possible mechanisms of X-ray production following electron impact ionization. In addition, the temperature measurement of the PF inner electrode is reported and some results have been proved useful in order to optimize the device functionalities.
    Źródło:
    Nukleonika; 2006, 51, 1; 15-20
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Virtual 3D modeling of the ammonoid conch to study its hydrostatic properties
    Autorzy:
    Moron-Alfonso, D.A.
    Peterman, D.J.
    Cichowolski, M.
    Hoffmann, R.
    Lemanis, R.E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082232.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cephalopoda
    Ammonoidea
    virtual modeling
    3D
    conch
    CT-scan
    morphometry
    Cretaceous
    Antarctica
    Opis:
    Computed tomography has provided a wealth of biological data that now stands beside a vast, more traditional, morphometric database. By exploiting these two resources, we present a novel methodology to construct intricate, virtual cephalopod shells. As a case of study, we applied this method to Maorites seymourianus using data obtained from a previous work. For this purpose, evaluation of the conch geometry, and the definition of new parameters such as the segment width expansion rate (SWER), segment height expansion rate (SHER), the segment thickness expansion rate (STER), and three indices related, were introduced. The conch geometry of M. seymourianus follows a spiral that can be defined by a polynomial function. While similar to a logarithmic function, a polynomial fit is preferred because it reveals higher values of whorl expansion at the early ontogenetic phase and lower values reaching the adult body chamber. Results on the hydrostatic properties of the virtual models indicate that M. seymourianus would have a near neutral buoyancy, ranging from slightly positive to slightly negative, depending upon parameters that influence organismal mass. Positions of the center of mass and the center of buoyancy indicate that the studied species would have a relatively low hydrostatic stability, estimating a shell orientation of approximately 74–76° with respect to the vertical, with the aperture slightly inclined downwards relative to the horizontal plain.
    Źródło:
    Acta Palaeontologica Polonica; 2020, 65, 3; 467-480
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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