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Wyszukujesz frazę "Kobal, I." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Carbon-13 fractionation in the oxidation of propionate of natural isotopic composition with permanganate and manganate
    Autorzy:
    Zieliński, M.
    Fry, A.
    Zielińska, A.
    Ogrinc, N.
    Papiernik-Zielińska, H.
    Kobal, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146720.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    carbon-13
    carbon-14
    fractionation
    manganate
    oxidation
    permanganate
    propionate
    Opis:
    Carbon-13 fractionation in the oxidation of sodium propionate of natural isotopic composition with permanganate in water solution and with manganate in alkaline solution has been investigated and compared with carbon-14 kinetic isotope effects in the oxidation of (3-14C) – and (2-14C) propionate with permanganate. The experimental carbon-13 isotope ratios, R(13C/12C)cumul., corrected for dilution of R(13C/12C)a by carbon dioxide derived from all external sources and by carbon dioxide derived from (C-1) and from (C-3) of propionate at its complete and partial oxidations, used for calculation of 13C alfa KIE, provided the carbon-13 isotope effects corresponding to initial oxidation of alpha carbon, which correlate well with (2-14C) KIE determined previously, (k12/k13 -1)?100 ? 1/2(k12/k14 -1)?100 ? 1/2(4.6š0.3) at 373 K. The possibility of extension of isotope ratio measurements, using modern double collector mass spectrometers, from geochemical, biomedical, agriculture and environmental research to carbon-13 isotope effects studies in chemical organic reactions is briefly discussed.
    Źródło:
    Nukleonika; 2000, 45, 4; 221-224
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbon-13 isotope effect for decarboxylation of phenylpropiolic acid (PPA) in concentrated phosphoric acids
    Autorzy:
    Zieliński, M.
    Zielińska, A.
    Papiernik-Zielińska, H.
    Ogrinc, N.
    Kobal, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146141.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    carbon-13
    concentrated phosphoric acids
    decarboxylation isotope effects
    decarboxylation mechanism
    phenylpropiolic acid
    Opis:
    13C isotope effects on the decarboxylation of phenylpropiolic acid (PPA) in 93–97% H3PO4 and in 23% diphosphoric acid in orthophosphoric acid have been investigated from 293 to 353 K. The initial 13C fractionations in all three systems are in agreement with the 13C decarboxylation fractionations expected assuming the loss of the one carbon-carbon bond in the transition state. In 100% H3PO4 and in 23% diphosphoric acid in orthophosphoric acid later fractions of carbon dioxide are depleted in carbon-13 to a greater degree than expected, probably due to isotopic preequilibria between stable and decarboxylating forms of PPA. At 353 K and higher temperature strong deviations of the experimental rate constants and of the experimental 13C fractionations from the values extrapolated from lower temperature are observed. A tentative decarboxylation scheme operating in concentrated phosphoric acid media is proposed.
    Źródło:
    Nukleonika; 2000, 45, 2; 121-124
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A radon anomaly in soil gas at Cazzaso,NE Italy, as a precursor of an ML = 5.1 earthquake
    Autorzy:
    Vaupotič, J.
    Riggio, A.
    Santulin, M.
    Zmazek, B.
    Kobal, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/148908.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    soil gas
    Barasol probes
    anomalies
    earthquakes
    Opis:
    At Cazzaso (Friuli) in northeast Italy, radon (222Rn) activity concentration in soil gas in a borehole at a depth of 80 cm has been monitored continuously (at a frequency of once an hour) since May 2004, using a Barasol probe (Algade, France). In addition, environmental parameters (air and soil temperature, barometric pressure) have been recorded. The results have been evaluated and the relationship between radon levels and seismic activity is discussed. Correlation between radon concentration and barometric pressure has been observed. Preliminary results have shown a distinct radon anomaly prior to some earthquakes.
    Źródło:
    Nukleonika; 2010, 55, 4; 507-511
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Background outdoor radon levels in Slovenia
    Autorzy:
    Vaupotič, J.
    Kobal, I.
    Križman, M. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148834.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    outdoor air
    solid-state nuclear track detectors (SSNTD)
    outdoor radon map
    Opis:
    Radon (222Rn) activity concentration in outdoor air was measured by exposing track etch detectors at 60 points. Values were found in the range of 3.7–41.0 Bqźm–3, with a geometric mean (GM) of 11.8 Bqźm–3 and geometric standard deviation (GSD) of 2.2. An outdoor radon map of Slovenia was drawn, showing the majority of elevated values to be in the south-west part of the country that is covered by carbonates.
    Źródło:
    Nukleonika; 2010, 55, 4; 579-582
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of radon anomalies in soil gas using decision trees and neural networks
    Autorzy:
    Zmazek, B.
    Džeroski, S.
    Torkar, D.
    Vaupotič, J.
    Kobal, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/148699.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    soil gas
    anomalies
    decision trees
    artificial neural network
    earthquakes
    Opis:
    The time series of radon (222Rn) concentration in soil gas at a fault, together with the environmental parameters, have been analysed applying two machine learning techniques: (i) decision trees and (ii) neural networks, with the aim at identifying radon anomalies caused by seismic events and not simply ascribed to the effect of the environmental parameters. By applying neural networks, 10 radon anomalies were observed for 12 earthquakes, while with decision trees, the anomaly was found for every earthquake, but, undesirably, some anomalies appeared also during periods without earthquakes.
    Źródło:
    Nukleonika; 2010, 55, 4; 501-505
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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