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Wyszukujesz frazę "Roth, C. C." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Application of two fracture models in impact simulations
    Autorzy:
    Fras, T.
    Roth, C. C.
    Mohr, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/200605.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    armour steel
    Lode angle parameter
    stress triaxiality
    Hosford-Coulomb model
    Johnson-Cook model
    Opis:
    The following discussion concerns modelling of fracture in steel plates during an impact test, in which both target and striker are manufactured from the same material, high-strength high-hardness armour steel – Mars® 300. The test conditions (3 mm thick targets, projectiles with different nose shapes at impact velocity lower than 400 m/s) result in severely damaged components, which results in an analysis of stress states showing material failure. Numerical analyses are performed using two material models: the Johnson-Cook approach, as traditionally used in impact simulations, accounting for the effect of stress triaxiality, strain rate and temperature and for comparison, a simulation by means of the stress triaxiality and Lode angle parameter-dependent Hosford-Coulomb model, also incorporating the effect of the strain rate on a fracture initiation. The aim of the study is to analyse the mechanisms of penetration and perforation observed in the armour steel plates and validation of the modelling approaches.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 317-325
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rectification in Fullerene (C$\text{}_{60}$)-Phthalocyanine Thin Film Sandwich Structures
    Autorzy:
    Anderson, T.
    Akselrod, L.
    Fischer, C. M.
    Roth, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933395.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Ei
    73.61.Ph
    73.40.-c
    Opis:
    Bilayer sandwich structures were fabricated by the sequential thermal evaporation of gold, copper phthalocyanine (CuPc), C$\text{}_{60}$ and gold onto sapphire substrates. When the current-voltage characteristics of a freshly made device are measured in an atmosphere of argon, fairly strong rectification is observed. When the bilayer device is exposed to ammonia vapor, the rectification slowly decreases and almost disappears. If the device is then placed under vacuum and the ammonia removed, the initial conditions slowly return. We attribute the rectification to the formation of a p-n junction.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 877-880
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Survey of Industrial Applications of Conducting Polymers
    Autorzy:
    Roth, S.
    Graupner, W.
    McNeillis, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1932275.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Le
    81.90.+c
    89.20.+a
    Opis:
    Seventeen years after the first publication of doped polyacetylene we have already seen the appearance and disappearance of commercial products based on conducting polymers. In the present report we want to summarize the status quo in this field paying attention to existing products, laboratory demonstration set-ups and promising concepts.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 699-711
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Oxygen Impurities on Electrical Properties of Fullerene C$\text{}_{60}$
    Autorzy:
    Rabenau, T.
    Roth, S.
    Kremer, R. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933397.pdf
    Data publikacji:
    1995-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    72.80.Le
    72.20.-i
    Opis:
    We present high temperature dc, ac and contactless microwave conductivity results on solid-state C$\text{}_{60}$ (films and crystals) from room temperature up to 850 K. Heating pristine samples, which were exposed to the ambient atmosphere, under dynamic vacuum at first leads to a reduction of the electrical resistance and finally, above ≈700 K, to an increase in the resistance. The decrease is ascribed to oxygen desorption and the increase to the chemical reactivity of residual chemisorbed oxygen with the C$\text{}_{60}$ host molecules, respectively. Samples, annealed above 800 K, display a reversible temperature dependence of the resistance. The high temperature regime of their resistance exhibits an activated behaviour with an universal activation energy of 2E$\text{}_{a}$ = 1.85 ± 0.04 eV for crystals and films, which is identical to the HOMO-LUMO splitting of the C$\text{}_{60}$-molecules.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 4-5; 881-884
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The uses of Betula pendula Roth among Hungarian Csangos and Szekelys in Transylvania, Romania
    Autorzy:
    Papp, N.
    Czegenyi, D.
    Hegedus, A.
    Morschhauser, T.
    Quave, C.L.
    Cianfaglione, K.
    Pieroni, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/57187.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    silver birch
    Betula pendula
    ethnobotany
    medicinal plant
    traditional knowledge
    birch sap
    Transylvania region
    Romania
    Opis:
    The aim of this work is to evaluate the ethnobotanical and ethnopharmacological use of Betula pendula Roth in various regions of Transylvania, in East and Central Romania. Silver birch is an important pioneer species in the country, which has traditionally been used in ethnomedicine, households and various customs. Among the ethnic groups, 55 informants from the Csángós and 68 from the Székelys were interviewed in six villages during field studies occurring between 2007 and 2012. Informants were asked questions about the medical and non-medical applications of B. pendula, focusing on the use of the leaf and woody parts in tools and customs, and on the collection and use of birch sap with its temporal change in local ethnomedicinal knowledge. Differences related to the use of birch among the studied areas were observed. The folk remedies prepared from the sap (“virics”) and leaves were documented in local customs, with similar symbolic roles assigned to birch used in other countries. Sap collection was performed during interviews and by manual means. Four special section types on the trunk were presented, and data concerning the nutritional and ethnomedicinal use of the sap was recorded. Both the significance and use of birch sap have drastically decreased in Transylvania due to the appearance of new phytotherapeutical sources and to social changes caused by migration of young people. We found that this phenomenon is gradually leading to the disappearance traditional harvesting techniques, frequency of use and ethnomedicinal knowledge concerning B. pendula in the studied regions.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2014, 83, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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