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Loffhagen Detlef Becker Markus M. Czerny Andreas K. Klages Claus-Peter 《Plasma Chemistry and Plasma Processing》2021,41(1):289-334
Plasma Chemistry and Plasma Processing - A time-dependent, spatially one-dimensional fluid-Poisson model is applied to analyze the impact of small amounts of tetramethylsilane (TMS) as precursor on... 相似文献
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Sterilisation of plastic packaging materials for food, pharmaceutical or cosmetic products with 60Co γ-irradiation in the presence of oxygen can result in the formation of volatile substances. These may subsequently induce off-odours in these materials that might be regarded as negative by the consumers. Trace volatiles and odorous substances of polypropylene, irradiated with 60Co γ rays at 10 and 20 kGy, respectively, were collected and analysed by gas chromatography–olfactometry (GC–O), GC–MS and GC–GC–MS. The methodology was successfully applied for identification of 29 characteristic odorants in a non-irradiated control sample and 38 odorants in γ-irradiated polypropylene samples. Selected odour-active compounds were quantified using GC–GC–MS in combination with stable isotope dilution assays. The quantitative data mirrors the compositional changes in volatile odorous substances from polypropylene during treatment with ionising γ rays in a 60Co-irradiation plant. 相似文献
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B. M. Margoschcs W. Hinner L. Friedmann K. Fuchs E. Neufeld Mauricy Frischer A. Grün W. Czerny M. Nahptali D. Holdes und deutsche Kommission zur Schaffung einheitlicher Untersuchungsverfahren für die Fettindustrie 《Fresenius' Journal of Analytical Chemistry》1927,72(1-2):64-67
Ohne Zusammenfassung 相似文献
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M. Czerny 《Zeitschrift für Physik A Hadrons and Nuclei》1929,53(5-6):317-325
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W. Feldheim und M. Czerny 《Fresenius' Journal of Analytical Chemistry》1958,162(3):193-197
Zusammenfassung Die Abbauprodukte des Vitamins C, die 2,3-Diketo-L-gulonsäure und dis L-Threonsäure, wurden hergestellt und ihre Lösungen papierchromatographisch charakterisiert. Der in Chromatogrammen von Ascorbinsäure enthaltendem Material häufig auftretende Fleck mit dem Rf-Wert 0,11–0,14 ist als der 2,3-Diketo-L-gulonsäure zugehörig erkannt worden. Der Rf-Wert der als Vergleichssubstanz herangezogenen 2-Keto-L-gulonsäure beträgt 0,14–0,16, der ihrer Alkalisalze 0,10–0,12. 相似文献
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Czerny AM Bénard P Chahine R 《Langmuir : the ACS journal of surfaces and colloids》2005,21(7):2871-2875
A carbon adsorbent was produced and used to volumetrically measure nitrogen adsorption isotherms from 93 to 298 K and up to 7 MPa. The isosteric heat of adsorption was determined to range between -9.5 and -16 kJ/mol. The excess adsorption isotherms were modeled using an approach based on a modified Dubinin-Astakhov adsorption model, adapted for excess adsorption, which provided an accurate fit for all supercritical isotherms. An expression for the differential energy of adsorption as a function of pressure was developed using the Dubinin-Astakhov isotherm. The energy of adsorption for the isotherms measured was found to range from -8 to -15 kJ/mol as a function of pressure. 相似文献
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