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

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Decomposition of toluene in air mixtures under electron beam irradiation
    Autorzy:
    Sun, Y.
    Chmielewski, A. G.
    Bułka, S.
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/148028.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    toluene
    4-chlorotoluene
    decomposition
    electron beam
    Opis:
    The model gases of toluene-air mixtures were prepared by blowing technical air into liquid toluene and then irradiated with an ILU-6 accelerator located at the Institute of Nuclear Chemistry and Technology (INCT), Poland. It was found that the decomposition efficiency of toluene increases with absorbed dose and decreases with initial concentration of toluene. At 14.5 kGy dose, the decomposition efficiencies of toluene were 50, 37 and 34.5% for the initial concentrations of toluene 32.0, 63.4 and 78.0 ppm, respectively. At 58.0 kGy dose, the decomposition efficiencies of toluene were 93.8 and 78.1%, the initial concentrations of toluene being 32.0 and 63.4 ppm, respectively. Benzaldehyde was identified as one of the by-products of toluene decomposition in an air mixture. The decomposition efficiency and by-product formation under EB irradiation were compared between toluene and 4-chlorotoluene.
    Źródło:
    Nukleonika; 2009, 54, 2; 65-70
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of decomposition of dichloroethylenes (trans-DCE, cis-DCE, 1,1-DCE)/air under electron beam irradiation
    Autorzy:
    Sun, Y.
    Chmielewski, G.
    Bułka, S.
    Zimek, Z.
    Nichipor, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/146568.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    trans-dichloroethylene
    cis-dichloroethylene
    1,1-dichloroethylene
    electron beam
    decomposition
    mechanism
    Opis:
    On the basis of the experimental results, computer simulations of decomposition of dichloroethylenes for three isomers (trans-DCE, cis-DCE, 1,1-DCE) in air under electron beam were carried out. Computer code “Kinetic” and “Gear” method were used. Calculation results well agree with the experimental results. Decomposition efficiency of DCE is mainly determined by Cl- dissociated secondary electron attachment, followed by Cl radical addition reaction with DCE.
    Źródło:
    Nukleonika; 2007, 52, 2; 59-67
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The kinetics of 1,1-dichloroethene (CCl2=CH2) and trichloroethene (HClC=CCl2) decomposition in dry and humid air under the influence of electron beam
    Autorzy:
    Nichipor, H.
    Dashouk, E.
    Yacko, S.
    Chmielewski, A.
    Zimek, Z.
    Sun, Y.
    Vitale, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148600.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    1,1-dichloroethene
    trichloroethene
    electron beam decomposition
    theoretical model
    kinetics calculation
    Opis:
    New experimental data related to the removal of C2H2Cl2 and C2HCl3 in dry and humid (300 ppm of H2O) air at atmospheric pressure and a temperature of 25°C under the influence of electron beam in the dose range 1 < D < 100 kGy are published. Taking into account these experimental data, theoretical models of the decomposition of both compounds and computer simulations were performed by the present authors to find the kinetics of such processes. The influence of active atoms Cl, O and OH radicals on the VOC degradation process has been established. The theoretical model of C2H2Cl2 degradation under the influence of electron beam in dry and humid air describes the C2H2Cl2 decay and formation of the main products like Cl2, COCl2, CO, CO2, HCl, HCOCl and C2H2Cl2O. The results of calculation of the kinetics of C2H2Cl2 decomposition were compared with data obtained experimentally for the C2H2Cl2 concentration range 321-2213 ppm. It was established that the relation between the rate constants of intermediate product decomposition: C2H2Cl3O Ţ C2H2Cl2O + Cl; (k1) C2H2Cl3O Ţ COCl2 + CH2C2; (k2) should be k1/k2 = 40. The theoretical model of C2HCl3 degradation under the influence of electron beam in dry and humid air describes the C2HCl3 decay and formation of the main products like Cl2, COCl2, CO, CO2, HCl, HCOCl and C2HCl3O. A detailed comparison of experimental and theoretical data for the C2HCl3 concentration 108-3206 ppm shows that the relation between the rate constants of intermediate product decomposition: C2HCl4O Ţ C2HCl3O + Cl; (k3) C2HCl4O Ţ COCl2 + CHCl2; (k4) should be k3/k4 =10. It was also found that O2+ ions have been formed in a gas mixture as a result of charge transfer process from N2+ ions, partly in excited form, which may lead to charge transfer to C2HCl3 and degradation of those particles. According to performed calculation, it can be stated that in humid air (300 ppm of H2O) VOC degradation is occurring mainly due to a chain reaction stimulated by Cl atoms, but also OH radicals are playing an important role. In the described gas mixture, the OH radicals are formed in the following reactions: O2+) + H2O + M Ţ (O2+)H2O + M O2+ (H2O) + H2O Ţ O2 + (H3O+)OH (H3O+)OH + H2O Ţ H3O+ + OH + H2O VOC degradation process under the influence of electron beam is more effective in humid air than in dry air for the same initial VOC concentration level. This conclusion is also supported by experimental data. --------------------------------------------------------------------------------
    Źródło:
    Nukleonika; 2003, 48, 1; 45-50
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stable isotope deuterium as a natural tracer of mixing processes in rivers
    Autorzy:
    Palige, J.
    Ptaszek, S.
    Zimnicki, R.
    Chmielewski, A. G.
    Wierzchnicki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146756.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    stable isotopes
    tracer
    deuterium
    oxygen-18
    river
    water flow
    Opis:
    The possibility of application of naturally existing differences in isotope contents 18O/16O, 2H/1H in waters for investigation of transport and mixing of various waters in the tributary-river system is presented. Experiments carried out on the Bug-Narew rivers-Zegrze Lake and the BugoNarew-Vistula rivers systems have indicated that the hydrogen isotope ratio 2H/1H can be used as an intrinsic tracer of natural mixing processes occurring in rivers. The IRMS methodology was used for isotope ratio measurement of water samples. The degrees of water mixing as a function of distance from the confluence point of rivers were determined. The obtained results indicate that in water systems where the natural differences in ?2H are higher than 5‰ this technique can replace the time-consuming and expensive dye (or radiotracer) dispersion tests for evaluation of pollutant transport in rivers.
    Źródło:
    Nukleonika; 2008, 53, 2; 63-67
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical study of dose and dose rate effect on trichloroethylene (HClC=CCl2) decomposition in dry and humid air under electron beam irradiation
    Autorzy:
    Nichipor, H.
    Yacko, S.
    Sun, Y.
    Chmielewski, A. G.
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146819.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    trichloroethylene
    electron beam decomposition
    computer simulation
    Opis:
    Experimental data related to C2HCl3 (TCE) removal in dry and humid (200-1000 ppm of H2O) air, respectively, in ambient conditions under electron beam irradiation in the dose range of 1-40 kGy has been published in the literature. Based on the experimental results a theoretical model of C2HCl3 decomposition was proposed for the kinetic mechanism of such process. The active radicals of Cl, O and OH play an important role in the decomposition of TCE. According to the calculations performed, the Cl- dissociative electron attachment predominates in the initial stage of C2HCl3 decomposition. Cl radical accelerates this degradation by chain process in both humid and dry air, respectively. The OH radical produced in humid air also enhances the decomposition process of TCE.
    Źródło:
    Nukleonika; 2008, 53, 1; 11-16
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on biological activity of chitosan after radiation processing
    Autorzy:
    Gryczka, U.
    Gawrońska, A.
    Migdał, W
    Gawroński, S. W.
    Chmielewski, A. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148626.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    chitosan
    biostimulators
    ionizing radiation
    willow
    biomass
    Opis:
    In recent years there is a trend in industry to limit the usage of chemical compounds. Natural polymers are new promising materials that possess important properties like biodegrability or lack of toxicity. Radiation processing of natural occurring polymers is an area of current research for development of new applications. The aim of this study was to determine the impact of ionizing radiation modification on bioactivity of a natural polysaccharide. Chitosan with different molecular weights was investigated as a biostimulator – a biologically active substance that stimulates some growth processes in plants. Chitosan in solid state was irradiated with electron beam from an electron beam accelerator Elektronika 10-10 with a dose range from 50 to 300 kGy. The effects of irradiation on the molecular weight of chitosan were investigated by viscosity and GPC measurements. Non-irradiated and irradiated chitosan at concentrations 0.001, 0.01, 0.1 and 1 g/dm3 were used for greenhouse tests of its activity for growth promotion of Salix viminalis L. var. gigantea plant. Uniform rooted cuttings (20 per combination) were selected for the test and cultivated in aerated hydroponics culture containing Hoagland’s nutrient solutions plus respective amounts of chitosan. After six weeks of plant exposure to chitosan, data of selected parameters of plant growth were collected. In most cases, except the highest concentration, both forms of chitosan had stimulatory effect on leaf area, length of roots and of newly developed shoots. Also fresh and dry weights of these organs were greater in chitosan treated plants. The highest concentration of chitosan was stimulatory only for a number of roots and newly developed shoots while for other parameters was inhibitory. In comparable concentrations the stimulatory effect was greater for chitosan irradiated in comparison with the non-irradiated one.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 73-76
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation of lithium titanate by sol-gel method
    Autorzy:
    Deptuła, A.
    Łada, W.
    Olczak, T.
    Sartowska, B.
    Chmielewski, A.
    Alvani, C.
    Casadio, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/147573.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Opis:
    Medium sized spherical particles of Li2TiO3 (with diameters below 100 mi m) can be prepared from peroxy lithium titanate solution (stabilized with citric acid) by a modified INCT variant of the sol-gel process. The process consists of the following main steps: (I) formation of aqueous phase emulsion in 2-ethylhexanol-1 containing the surfactants 1v/o SPAN-80 and 1v/o Ethomen S-15 (EH); (II) gelation of emulsion drops by extraction of water with partially dehydrated EH; (III) filtration and washing with carbon tetrachloride or acetone; (IV) non-destructive thermal treatment. The tritium release from sol-gel process preparation of Li2TiO3 micro-spheres was found very close to that observed for other traditional material however, the new process is more efficient than other processes because of the morphology of the sintered specimens.
    Źródło:
    Nukleonika; 2001, 46, 3; 95-100
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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