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Wyszukujesz frazę "Voigt, S." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Toward the origin of amniotes: Diadectomorph and synapsid footprints from the early Late Carboniferous of Germany
    Autorzy:
    Voigt, S.
    Ganzelewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/20515.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    amniote
    tetrapod
    diadectomorph
    footprint
    Late Carboniferous
    Carboniferous
    paleontology
    Germany
    Ichniotherium
    Dimetropus
    Cotylosauria
    tetrapod track
    Opis:
    Ichnotaxonomic revision of two extended sequences of large tetrapod footprints from the Westphalian A Bochum Formation of western Germany suggests assignment of the specimens to the well−known Permo−Carboniferous ichnogenera Ichniotherium and Dimetropus. Trackway parameters and imprint morphology strongly support basal diadectomorphs and “pelycosaurian”−grade synapsid reptiles, respectively, as the most likely trackmakers. The ichnofossils thereby extend the first appearance of these two important groups of basal tetrapods by about 5–10 million years, to the early Late Carboniferous, which is in accordance with the minimum age for the evolutionary origin of the clades following widely accepted phylogenetic analyses. These trackways provide not only direct evidence bearing on activity and behaviour of large terrestrial tetrapods close to the origin of amniotes, but also serve as a valuable benchmark for the assessment of controversially interpreted vertebrate tracks from other localities of similar age.
    Źródło:
    Acta Palaeontologica Polonica; 2010, 55, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zig-zag facial total-coloring of plane graphs
    Autorzy:
    Czap, J.
    Jendrol, S.
    Voigt, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/255827.pdf
    Data publikacji:
    2018
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    plane graph
    facial coloring total-coloring zig-zag coloring
    Opis:
    In this paper we introduce the concept of zig-zag facial total-coloring of plane graphs. We obtain lower and upper bounds for the minimum number of colors which is necessary for such a coloring. Moreover, we give several sharpness examples and formulate some open problems.
    Źródło:
    Opuscula Mathematica; 2018, 38, 6; 819-827
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measures to reduce the residual field and field gradient inside a magnetically shielded room by a factor of more than 10
    Autorzy:
    Voigt, J.
    Knappe-Grüneberg, S.
    Schnabel, A.
    Körber, R.
    Burghoff, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/220358.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnetic shielding
    magnetic shielded room
    msr
    residual field
    residual field gradient
    degaussing
    demagnetization
    Opis:
    Very low residual magnetic field and field gradients are essential for a number of high resolution fundamental physical experiments and for further improvement of very sensitive magnetic measurement devices. The scope ranges from spin precession experiments, e.g. with 3He or neutrons, to biomagnetic measurements, like magnetoencephalograms, and to low field MR spectroscopy. One method of reducing environmental magnetic noise is to use a magnetically shielded room (MSR). Here, measures are demonstrated to improve residual field and field gradient inside a common MSR by a factor of more than 10 by a specific degaussing procedure, material selection of prefabricated parts and active shielding. The process is independent of the shielding factor and works also properly for heavily shielded rooms.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 2; 237-248
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved contrast in ultra-low-field mri with time-dependent bipolar prepolarizing fields: theory and nmr demonstrations
    Autorzy:
    Nieminen, J. O.
    Voigt, J.
    Hartwig, S.
    Scheer, H. J.
    Burghoff, M.
    Trahms, L.
    Ilmoniemi, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220699.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    T1 dispersion
    prepolarization
    polarizing field
    ultra-low-field MRI
    Opis:
    The spin-lattice (T1) relaxation rates of materials depend on the strength of the external magnetic field in which the relaxation occurs. This T1) dispersion has been suggested to offer a means to discriminate between healthy and cancerous tissue by performing magnetic resonance imaging (MRI) at low magnetic fields. In prepolarized ultra-low-field (ULF) MRI, spin precession is detected in fields of the order of 10-100 μT. To increase the signal strength, the sample is first magnetized with a relatively strong polarizing field. Typically, the polarizing field is kept constant during the polarization period. However, in ULF MRI, the polarizing-field strength can be easily varied to produce a desired time course. This paper describes how a novel variation of the polarizing-field strength and duration can optimize the contrast between two types of tissue having different T1) relaxation dispersions. In addition, NMR experiments showing that the principle works in practice are presented. The described procedure may become a key component for a promising new approach of MRI at ultra-low fields.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 3; 327-336
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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