Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Zimek, Z." wg kryterium: Autor

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-15 z 15
    Tytuł:
    A review on electron beam flue gas treatment (EBFGT) as a multicomponent air pollution control technology
    Autorzy:
    Basfar, A. A.
    Fageeha, O. I.
    Kunnummal, N.
    Chmielewski, A. G.
    Licki, J.
    Pawelec, A.
    Zimek, Z.
    Warych, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148616.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fossil fuel combustion
    heavy fuel oil
    electron beam irradiation
    plasma processes
    flue gas treatment
    SO2 removal
    NOx removal
    Źródło:
    Nukleonika; 2010, 55, 3; 271-277
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Akceleratory elektronów stosowane w technice radiacyjnej (niezawodność, aspekty ekonomiczne)
    Accelerators of electrons applied in radiation processing (reliability, economic aspects)
    Autorzy:
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/214139.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    akceleratory elektronów
    technika radiacyjna
    niezawodność
    aspekt ekonomiczny
    electron accelerators
    radiation processing
    reliability
    economic aspects
    Opis:
    Rozwój technologiczny akceleratorów stosowanych w technice radiacyjnej jest dobrze widoczny w dłuższej skali czasowej. Obecnie szczególnie intensywnie kontynuowane są prace mające na celu podniesienie sprawności elektrycznej akceleratorów, obniżenie ich ceny oraz podniesienie niezawodności. W niedalekiej przyszłości możliwy będzie transfer technologii z obszaru akceleratorów badawczych stosowanych w fizyce wysokich energii, co pozwali na konstrukcję innowacyjnych urządzeń poszerzających znacząco zakres możliwości technicznych i cenowych. Blisko 3000 akceleratorów elektronów znalazło do chwili obecnej zastosowanie w technice radiacyjnej, która wykorzystuje wiązkę elektronów jako narzędzie do inicjowania pożądanych reakcji chemicznych, modyfikacji materiałów, a także wykorzystuje biobójcze działanie promieniowania jonizującego. Ogromne możliwości upowszechnienia technologii radiacyjnych są związane z wykorzystaniem radiacyjnej obróbki produktów żywnościowych oraz zastosowaniem na szeroką skalę wiązki elektronów w instalacjach związanych z ochroną środowiska. Najliczniejszą grupą akceleratorów elektronów stosowanych w technice radiacyjnej są niskoenergetyczne akceleratory o działaniu bezpośrednim. Szczególną klasą urządzeń są akceleratory rezonansowe, umożliwiające uzyskanie wysokich energii oraz mocy wiązki elektronów. Znacznym osiągnięciem aplikacyjnym była konstrukcja i instalacja rezonansowego akceleratora typu Rhodotron z mocą wiązki 560 kW i energią elektronów 7 MeV, wyposażonego w konwertor wiązki elektronów na promieniowanie hamowania. Urządzenie tego typu stanowi ekwiwalent źródła gamma o aktywności 4,4 MCi gamma Co60. Niezawodność czyli prawdopodobieństwo, że akcelerator może pełnić swoje funkcje w określonym czasie w wyznaczonych warunkach, oraz dostępność czyli czas, w którym akcelerator wypełnia swoje zadania to parametry, które w zastosowaniach przemysłowych nabierają podstawowego znaczenia. Wyroby modyfikowane radiacyjnie muszą spełniać wszystkie kryteria przydatności zgodnie z oczekiwaniami rynku, a jednocześnie technologie radiacyjne muszą wykazać się lepszymi wskaźnikami techniczno- ekonomicznymi w porównaniu do konwencjonalnych technologii aktualnie istniejących. Stąd konieczność optymalizacji decyzji inwestycyjnych głównie z uwagi na wysokość kosztów związanych z zakupem akceleratora i jego eksploatacją. Konieczne jest prowadzenie nieustannych wysiłków dla zwiększenia zrozumienia przydatności technologii radiacyjnych, co może być ważnym czynnikiem wzrostu tego przemysłu. W obecnych warunkach współpraca z przemysłem staje się niezbędnym warunkiem inicjowania i rozwijania badań aplikacyjnych niezbędnych przy opracowaniu nowych technologii radiacyjnych.
    The development of the accelerator technology applied in the radiation processing is well visible in the longer time scale. The current issues are improvement of the electric efficiency of accelerators, the lowering of their price and elevation of accelerator reliability. The transfer of accelerator technology from the field of high energy physics is quite possible in the near future. It will allow to construct innovative devices and offer significantly better technical capabilities and unit price. Nearly 3000 accelerators of electrons have been applied in radiation processing up to now. The electron beam is used as the tool to initiating desirable chemical reactions, materials modification, and decontamination of the medical products. Huge capabilities to increase implementation of radiation processing may create electron beam utilization for food products decontamination and use on the wide scale the electron beams in processes connected with the protection of the environment. Low energy direct accelerators are the most numerous group of the electron accelerators applied in the radiation technique. Resonance accelerators are the special class of devices capable to reach high energy and beam power. The considerable achievement is construction and installation of the accelerator Rhodotron type with the beam power of 560 kW and the energy of electrons 7 MeV. The described accelerator was equipped with the X-ray converter. This device comprises a direct equivalent of the gamma source with the activity 4.4 MCi of Co60. Reliability that is the probability, that the accelerator can function in the definite time in appointed conditions. Accessibility is the time, in which the accelerator functions properly. Both parameters are becoming important for industrial facilities exploitation. Products modified by radiation have to fulfill all criteria of usefulness according to market expectations. Radiation technologies have to simultaneously be characterized by better technical and economic ratings in comparison with conventional technologies. Hence the necessity of the optimization of investment decisions related to costs connected with the accelerator purchase and exploitation. The efforts are necessary for enlargement of the understanding of the radiation processing usefulness what can be the important factor of this industry growth in future. The co-operation with the industry becomes the indispensable condition of initiating and unrolling applied study related to new radiation technologies development.
    Źródło:
    Postępy Techniki Jądrowej; 2017, 1; 12-19
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Design Study on Electron Energy Spread Effect on Performance of Linac Irradiation Facility with the Aid of Electron Energy Spectrum Online Analyzer
    Autorzy:
    Bułka, S.
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2055250.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    radiation sterilization
    electron accelerator
    electron energy
    depth dose distribution
    computer modelling
    Opis:
    Ongoing energy measurement is one of the parameters such as: electron beam current, transporter speed, or scanning width, that must be recorded according to the conditions imposed in the accelerator validation procedure. Described measurement method based on the use of a secondary electron collecting electrode has been tested at the electron beam linear accelerator installation typically used for radiation sterilization. Data processing and presentation of the electron beam characteristics is based on the information obtained via dedicated pulse acquisition interface. The energy spectra parameters provide data for modeling and calculation of dose distribution for irradiation process optimization and also knowledge of accelerator RF alignment in case of service.
    Źródło:
    International Journal of Electronics and Telecommunications; 2022, 68, 1; 103--108
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of hindered amine light stabilizers on the resistance of polypropylene towards ionizing radiation
    Autorzy:
    Przybytniak, G.
    Mirkowski, K.
    Rafalski, A.
    Nowicki, A.
    Legocka, I.
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/148686.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    polypropylene
    stabilizers
    HALS
    electron beam
    apparent viscosity
    nucleation agent
    Opis:
    The influence of hindered amine light stabilizers (HALSs) on physical and mechanical properties of irradiated and non-irradiated isotactic polypropylene (PP) was studied. The stabilizers under investigation were: Tinuvin 765 (T765) and Tinuvin 622 (T622) - derivatives of 1,2,2,6,6-pentamethyl piperidine and Chimassorb 944 (C944) - a derivative of 2,2,6,6-tetramethyl piperidine. It was found that the stabilizers reduce the amount of peroxyl radicals in the amorphous phase of PP. The irradiation with electron beam causes a drop of apparent viscosity both in the original and in the modified PP however the effect is smaller in the presence of HALSs. Admixture of T622 and T765 stabilizers increases the crystallization temperature of non-irradiated PP by about 8 10°C (measured by DSC) what results from the facilitated formation of a large number small microcrystals. It was concluded that HALSs initiate two opposite tendencies - chemical protection against damage initiated by free radicals and, simultaneously, physical enhancement of sensitivity towards irradiation by the increase of nucleation density. In the studied systems, the presence of maleic anhydride does not improve compatibility between the polymeric matrix and HALSs.
    Źródło:
    Nukleonika; 2005, 50, 4; 153-159
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of ionizing radiation on the properties of PLA packaging materials
    Autorzy:
    Melski, K.
    Kubera, H.
    Głuszewski, W.
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/147073.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    packaging materials
    radiation modification of polymers
    radiation sterilization
    packaging films
    poly(lactic acid) (PLA)
    Opis:
    Poly(lactic acid) (PLA) is attractive as a substitute for classical polymer packaging material due to its biodegradability and sufficient mechanical and barrier properties. Presented research was focused on the changes of basic mechanical parameters after ionizing irradiation performed with doses in the range of 2.5–25 kGy, commonly used in radiation sterilization and preservation of foods. Two commercial available PLA packaging films were tested. The influence of radiation dose on the mechanical properties – tensile strength and elongation were determined using standardized methods. Radiation resistance of PLA is sufficient for packaging applications. The investigations of gas products of radiolysis of PLA have been made by gas chromatography after electron beam (EB) irradiations.
    Źródło:
    Nukleonika; 2011, 56, 1; 65-69
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron beam treatment of simulated marine diesel exhaust gases
    Autorzy:
    Licki, J.
    Pawelec, A.
    Zimek, Z.
    Witman-Zając, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148426.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron accelerator
    electron beam treatment
    free radicals
    marine diesel exhaust gases
    NOx removal
    seawater scrubber
    Opis:
    The exhaust gases from marine diesel engines contain high SO2 and NOx concentration. The applicability of the electron beam flue gas treatment technology for purification of marine diesel exhaust gases containing high SO2 and NOx concentration gases was the main goal of this paper. The study was performed in the laboratory plant with NOx concentration up to 1700 ppmv and SO2 concentration up to 1000 ppmv. Such high NOx and SO2 concentrations were observed in the exhaust gases from marine high-power diesel engines fuelled with different heavy fuel oils. In the first part of study the simulated exhaust gases were irradiated by the electron beam from accelerator. The simultaneous removal of SO2 and NOx were obtained and their removal efficiencies strongly depend on irradiation dose and inlet NOx concentration. For NOx concentrations above 800 ppmv low removal efficiencies were obtained even if applied high doses. In the second part of study the irradiated gases were directed to the seawater scrubber for further purification. The scrubbing process enhances removal efficiencies of both pollutants. The SO2 removal efficiencies above 98.5% were obtained with irradiation dose greater than 5.3 kGy. For inlet NOx concentrations of 1700 ppmv the NOx removal efficiency about 51% was obtained with dose greater than 8.8 kGy. Methods for further increase of NOx removal efficiency are presented in the paper.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 689-695
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functionalization of polymer surfaces by radiation-induced grafting
    Autorzy:
    Przybytniak, G.
    Kornacka, E. M.
    Mirkowski, K.
    Walo, M.
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146746.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radiation grafting
    EPR
    radicals
    radiation yield
    Opis:
    The mutual radiation grafting of acrylic acid (AAc) onto polyethylene (PE), polypropylene (PP) and polystyrene (PS) films was performed. At first stage of investigations, the influence of ionizing radiation on the trunk polymers was studied, i.e. the level of radicals stable at room temperature and radiation yield of evolved hydrogen were estimated for each polymer. The measurements were carried out using electron paramagnetic resonance (EPR) spectroscopy and gas chromatography (GC), respectively. Radiation yields of radicals as well as hydrogen emission increased in the following order PS < PP < PE. Under comparable conditions, the same relationship was found for the yield of radiation-induced grafting of AAc. A distinct correlation between content of radicals generated by ionizing radiation in polymeric matrices and grafting degree was confirmed for the studied materials. The effect of monomer and inhibitor concentrations on the efficiency of processes were studied as well.
    Źródło:
    Nukleonika; 2008, 53, 3; 89-95
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of ionizing radiation on the properties of a hydrobiodegradable aliphatic - aromatic copolyester
    Autorzy:
    Kubera, H.
    Melski, K.
    Assman, K.
    Głuszewski, W.
    Migdał, W.
    Zimek, Z.
    Czaja-Jagielska, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/146880.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    aliphatic-aromatic copolyester
    biodegradable polymer
    ionizing radiation
    Opis:
    This paper presents the results of the studies on changes of selected quality parameters of hydrobiodegradable aliphatic-aromatic copolyester (AAC). Radiation treatment was performed at the Institute of Nuclear Chemistry and Technology in Warsaw, using cobalt gamma-ray sources "Issledovatel" (dose rate 0.389 Gy/h) and "GC 5000" (8.5 Gy/h). The material was subjected to the impact of radiation doses of 5, 10, 20 and 40 kGy. Selected parameters of the packaging material, important from the standpoint of a potential application, have been studied: gaseous products of radiolysis, strength parameters in accordance with PN EN ISO 527-3, global migration PN-EN-1186-1:2002, FT-IR analysis using PCA method, contact angle measurement using the drop shape method. The results have demonstrated that there is no significant influence of ionizing radiation on AAC film parameters. Correlation between doses applied and values of measurements has not been found.
    Źródło:
    Nukleonika; 2012, 57, 4; 621-626
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of boundary effects on electron beam dose distribution formation in multilayer targets
    Autorzy:
    Kałuska, I.
    Lazurik, V. T.
    Lazurik, V. M.
    Popov, G. F.
    Rogov, Y. V.
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/148556.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    absorbed dose
    electron beam
    simulation
    Monte Carlo
    software ModeStEB
    dosimetry
    Opis:
    Computational dosimetry play a significant role in an industrial radiation processing at dose measurements in the product irradiated with electron beams (EB), X-ray and gamma ray from radionuclide sources. Accurate and validated programs for absorbed dose calculations are required for computational dosimetry. The program ModeStEB (modelling of EB processing in a three-dimensional (3D) multilayer flat targets) was designed specially for simulation and optimization of industrial radiation processing, calculation of the 3D absorbed dose distribution within multilayer packages. The package is irradiated with scanned EB on an industrial radiation facility that is based on the pulsed or continuous type of electron accelerators in the electron energy range from 0.1 to 25 MeV. Simulation of EB dose distributions in the multilayer targets was accomplished using the Monte Carlo (MC) method. Experimental verification of MC simulation prediction for EB dose distribution formation in a stack of plates interleaved with polyvinylchloride (PVC) dosimetric films (DF), within a packing box, and irradiated with a scanned 10 MeV EB on a moving conveyer is discussed.
    Źródło:
    Nukleonika; 2010, 55, 3; 363-368
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pasywne urządzenia do usuwania wodoru z obudowy bezpieczeństwa reaktora jądrowego
    Autorzy:
    Zimek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/214240.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    reaktor jądrowy
    źródła wodoru
    pasywny katalizator wodoru
    rekombinatory wodoru
    Źródło:
    Postępy Techniki Jądrowej; 2014, 1; 9-17
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation processing of polymers and semiconductors at the Institute of Nuclear Chemistry and Technology
    Autorzy:
    Zimek, Z.
    Przybytniak, G.
    Kałuska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/146107.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam accelerators
    radiation processing
    Opis:
    R&D studies in the field of radiation technology in Poland are mostly concentrated at the Institute of Nuclear Chemistry and Technology (INCT). The results of the INCT works on polymer and semiconductor modification have been implemented in various branches of national economy, particularly in industry and medicine. Radiation technology for polymer modification was implemented in the middle of the 1970-ties. Among others, the processes of irradiation and heat shrinkable products expansion have been developed. The transfer of this technology to Polish industry was performed in the middle of the 1980-ties. The present study aims at the formulation of new PE composites better suited to new generation of heat shrinkable products, for example, a new generation of hot-melt adhesives has been developed to meet specific requirements of customers. Modified polypropylene was used for the production of medical devices sterilized by radiation, especially disposable syringes, to overcome the low radiation resistance of the basic material. Modified polypropylene (PP-M) has been formulated at the INCT to provide material suitable for medical application and radiation sterilization process. Modification of semiconductor devices by EB was applied on an industrial scale since 1978 when the INCT and the LAMINA semiconductor factory successfully adopted that technology to improve specific semiconductor devices. This activity is continued on commercial basis where the INCT facilities served to contract irradiation of certain semiconductor devices according to the manufacturing program of the Polish factory and customers from abroad.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 129-132
    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:
    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
      Wyświetlanie 1-15 z 15

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies