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    Wyświetlanie 1-15 z 15
    Tytuł:
    Chemiczne aspekty energetyki jądrowej w projekcie Narodowego Centrum Badań i Rozwoju "Technologie wspomagające bezpieczny rozwój energetyki jądrowej"
    Chemical aspects of nuclear power in the National Centre of Research and Development project „Technologies supporting the safe development of nuclear power”
    Autorzy:
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/214495.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    chemia cyklu paliwowego
    chemia wody układu chłodzącego
    generacja wodoru
    fuel cycle chemistry
    chemistry of water cooling system
    hydrogen generation
    Opis:
    Artykuł przedstawia najważniejsze rezultaty prac prowadzonych w ramach trzech zadań projektu strategicznego Narodowego Centrum Badań i Rozwoju „Technologie wspierające rozwój bezpiecznej energetyki jądrowej” dotyczących chemicznych aspektów energetyki jądrowej. W realizacji tych zadań koordynowanych przez Instytut Chemii i Techniki Jądrowej uczestniczyło 14 różnych instytucji.
    The article presents the most important results of three research tasks in NCBR (National Centre of Research and Development) strategic project “Technologies supporting the safe development of nuclear power” related to chemical aspects of nuclear energy production. Fourteen institutions coordinated by the Institute of Nuclear Chemistry and Technology had been working on different topic related to those research tasks.
    Źródło:
    Postępy Techniki Jądrowej; 2015, 2; 14-15
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strategiczny projekt badawczy Narodowego Centrum Badań i Rozwoju pt. „Technologie wspomagające rozwój bezpiecznej energetyki jądrowej” Zadanie badawcze Nr 7 pt. „Analiza procesów generacji wodoru w reaktorze jądrowym w trakcie normalnej eksploatacji i w sytuacjach awaryjnych z propozycjami działań na rzecz podniesienia poziomu bezpieczeństwa jądrowego”
    Strategic research project of the National Centre for Research and Development „Technologies Supporting Development of Safe Nuclear Power Engineering” Research task No. 7 „Study of hydrogen generation processes in nuclear reactors under regular operation conditions and in emergency cases, with suggested actions aimed at upgrade of nuclear safety”
    Autorzy:
    Michalik, J.
    Kocia, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/214146.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    wodór w reaktorach LWR
    awaria LOCA
    koszulki paliwowe z Zircaloy’u
    radioliza wody reaktorowej
    pasywne autokatalityczne rekombinatory wodoru (PAR)
    hydrogen in LWR reactors
    LOCA (Loss Of Coolant Accident)
    Zircaloy fuel claddings
    radiolysis of reactor water
    Passive Autocatalytic Recombiner (PAR)
    Opis:
    Niniejsza publikacja przedstawia najważniejsze rezultaty prac wykonanych w ramach zadania badawczego nr 7 pt. „Analiza procesów generacji wodoru w reaktorze jądrowym w trakcie normalnej eksploatacji i w sytuacjach awaryjnych z propozycjami działań na rzecz podniesienia poziomu bezpieczeństwa jądrowego”. Zadanie realizowane było w ramach strategicznego projektu badawczego „Technologie wspomagające rozwój bezpiecznej energetyki jądrowej” powołanego przez Narodowe Centrum Badań i Rozwoju (NCBR) jako wsparcie dla zaplecza naukowego atomistyki w ramach działań związanych z programem rozwoju energetyki jądrowej w Polsce. Głównym celem tego projektu było przygotowanie jednostek badawczych do udziału w polskim programie jądrowym.
    This publication presents the main results of research task No. 7 „Study of hydrogen generation processes in nuclear reactors under regular operation conditions and in emergency cases, with suggested actions aimed at upgrade of nuclear safety”, which was carried out as part of a strategic research project “Technologies Supporting Development of Safe Nuclear Power Engineering” established by the National Centre for Research and Development (NCBR) under the framework of government program for development of nuclear energy in Poland. The main goal of that project was to enforce the readiness of research units for participation in Polish nuclear program.
    Źródło:
    Postępy Techniki Jądrowej; 2015, 3; 8-14
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Foreword
    Autorzy:
    Michalik, J.
    Halada, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146179.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 1-2
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR and ESEEM study of silver clusters in ZK-4 molecular sieves
    Autorzy:
    Sadło, J.
    Michalik, J.
    Kevan, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/146217.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ZK-4
    EPR
    ESEEM
    silver clusters
    Opis:
    Silver clusters generated by g-irradiation in ZK-4 zeolites – isostructural with Linde type A (LTA) zeolite, have been studied by electron paramagnetic resonance (EPR) spectroscopy. It was shown that even a small decrease of cation capacity resulting from a lower Si/Al ratio in the framework affects distinctly silver agglomeration. In dehydrated ZK-4 with Si/Al = 1.2 and 2.4 only silver dimers are stabilized, whereas in Linde 4A silver hexamers were trapped. In ZK-4 exposed to H2O and CH3OH, silver tetramers Ag43+ efficiently are formed. The results of electron spin echo envelope modulation (ESEEM) showed that the adsorbate molecules are in close vicinity to the clusters. It was postulated that in zeolites with low cation capacity the adsorbate molecules make difficult Ag0 migration promoting the reactions with Ag+ cations located in the same sodalite cage.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 49-54
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    X- and Q-band EPR study on dosimetric biomaterials
    Autorzy:
    Strzelczak, G.
    Sadło, J.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148148.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EPR
    X- and Q-band
    dosimeters
    bone powder and arcidae shell
    radicals
    Opis:
    Electron paramagnetic resonance (EPR) spectroscopy (X- and Q-band) was used for identification of stable radicals in: compact bone powder, shell of arcidae mollusc and crystalline alanine. The aim of our investigation was to analyze the complex EPR spectra of these materials and to identify paramagnetic species contributing to it. The most successful results were obtained in the EPR study (X- and Q-band) on deproteinized and irradiated bone powder and arcidae shell at room temperature.
    Źródło:
    Nukleonika; 2009, 54, 4; 247-250
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    50 lat bankowania i sterylizacji radiacyjnej tkanek w Polsce
    Autorzy:
    Kamiński, A.
    Komender, J.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/214115.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    bank tkanek
    sterylizacja przeszczepów
    sterylizacja radiacyjna
    Źródło:
    Postępy Techniki Jądrowej; 2013, 3; 13-17
    0551-6846
    Pojawia się w:
    Postępy Techniki Jądrowej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study on sugar radicals utilized for detection of radiation treatment of food
    Autorzy:
    Guzik, G. P.
    Stachowicz, W.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146706.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    density functional theory (DFT)
    dried fruits
    electron paramagnetic resonance (EPR)
    irradiation
    mannose
    sorbose
    Opis:
    Radicals produced by ionizing radiation in sugars, the components of dried and raw fruits give rise to stable multicomponent electron paramagnetic resonance (EPR) signals unidentified so far. The subject of the present EPR study is to identify the radicals stabilized in gamma-irradiated crystalline sugars, D(+)mannose and L(-)sorbose extracted from cranberries (Vaccininum oxycoccos) and rowan berries (Sorbus aucuparia), respectively. EPR measurements and density functional theory (DFT) simulations were employed for that purpose.
    Źródło:
    Nukleonika; 2012, 57, 4; 545-549
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on stable radicals produced by ionizing radiation in dried fruits and related sugars by electron paramagnetic resonance spectrometry and photostimulated luminescence method – I. D-fructose
    Autorzy:
    Guzik, G. P.
    Stachowicz, W.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147212.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    fructose
    PPSL
    EPR
    irradiation
    detection
    food products
    Opis:
    Stability of sugar born radicals separated from irradiated Iranian dried raisins and from D-fructose by Sigma Aldrich has been studied at room temperature by EPR and PPSL methods in a period of 360 days. It has been proven for the first time experimentally that the complex EPR spectrum of irradiated sugars is changed in time and after heating. Hence, this made it possible to distinguish spectral lines of two specific radicals contributing to the formation of multicomponent spectra, recorded in both time dependent and heating experiments. The radicals measured by EPR and energy traps detected by PPSL decay at room temperature in a similar way, suggesting a similar distribution of both species in sugar crystallites. We think that our experimental approach might be useful to study interrelation between the formation and trapping of radicals and energy accumulated in crystalline matrices. In order to achieve the isolation of individual sugars from fruits the extraction and specific separation procedures have been adapted with the use of methanol, ethanol and water solvents. Our results clearly show that radicals induced by radiation in fruits (with fructose born radicals as major constituent) are stable enough at room temperature for easy identification of irradiated raisins using the EPR method.
    Źródło:
    Nukleonika; 2008, 53, suppl. 2; 89-94
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of irradiated dried fruits using EPR spectroscopy
    Autorzy:
    Guzik, G. P.
    Stachowicz, W.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148844.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dried fruits
    electron paramagnetic resonance (EPR)
    fructose
    glucose
    irradiation
    Opis:
    The dominating carbohydrates in fruits are monosaccharides like fructose, glucose, sorbose and mannose. In dehydrated fruits, concentration of monosaccharides is higher than in fresh fruits resulting in the formation of sugar crystallites. In most of dried fruits, crystalline fructose, and glucose dominate and appear in proportion near to 1:1. Irradiation of dried fruits stimulates radiation chemical processes resulting in the formation of new chemical products and free radicals giving rise to multicomponent EPR signal which can be detected for a long period of time. For that reason, it is used as a marker for the detection of radiation treatment of dried fruits. It has been found that EPR spectra recorded in dried banana, pineapple, papaya, and fig samples resemble the EPR spectrum obtained by computer addition of fructose and glucose spectra taken in proportion 1:1. The decay of radiation induced EPR signals proceeds in dried fruits fast during the first month of observation and becomes much slower and almost negligible after prolonged storage. However, it remains intense enough for EPR detection even one year after processing. The radiation induced EPR signal is easily detected in dried fruits exposed to 0.5 kGy of gamma rays. Thus, the EPR method of the detection of irradiated fruits can be used for the control of dried fruits undergoing quarantine treatment with 200–300 Gy of ionizing radiation.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 627-631
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Silica materials with biocidal activity
    Autorzy:
    Chmilewska, D.
    Łukasiewicz, A.
    Michalik, J.
    Sartowska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/146229.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    biocides
    quaternary N-alkylammonium salts
    silver metallized coatings
    Opis:
    Pathogenic microorganisms like fungi, bacteria and algae are harmful to human beings and animals. Moreover, they contribute to the destruction of building materials by their biodegradation. Therefore, they create serious hazard for the natural environment. To prevent these phenomena, different materials with biocidal activity are being developed. In elaboration of such materials, one of the most difficult problems to be solved is the achievement of their high effectiveness in controlling harmful microorganism population with the guarantee of safety of their application to the natural environment and humans. As a result of investigation carried out in the INCT on new biocides based on quaternary N-alkylammonium salts (QAC), mainly benzalkonium chloride, and water glass (WG) large group of new silica materials with biocidal activity were synthesised. Possibilities of technology modification in order to obtain different profitable properties of materials are presented in the paper. Preliminary investigations concerning biocidal activity against selected mould fungi, bacteria and algae were performed. Results of microbiological investigations proved stable effectiveness of biocides for protection from harmful microorganisms growth, which does not decrease even after washing of biocidal material with water. Silica materials with biocidal activity due to structural binding of biocidal agent (QAC) can be applied in building industry as materials of high ecological safety.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 69-72
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study of γ-irradiated feather keratin and human fingernails concerning retrospective dose assessment
    Autorzy:
    Strzelczak, G.
    Sterniczuk, M.
    Sadło, J.
    Kowalska, M.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148231.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EPR spectroscopy
    keratin
    melanin
    radicals
    fingernails
    dosimetry
    Opis:
    In this paper we report the results of comparative EPR studies on free radicals generated in γ-irradiated powder samples of feather keratin powder and human fingernails. In degassed samples of both materials irradiated at 77 K the major component of EPR spectrum represents sulphur-centred radicals in cysteine residues. It quickly decays after air admission at room temperature while a singlet assigned to semiquinone melanin radicals remains the only one seen. The singlet recorded with fingernails decays slowly at room temperature and might be potentially useful for dose assessment by EPR. The advantages and limitations of fingernails EPR dosimetry are discussed.
    Źródło:
    Nukleonika; 2013, 58, 4; 505-509
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study of highly stable methyl radicals trapped in synthetic H-rho zeolite
    Autorzy:
    Danilczuk, M.
    Sadło, J.
    Lund, A.
    Yamada, H.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147860.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    methyl radicals
    zeolite rho
    EPR
    radiolysis
    Opis:
    Methyl radicals generated by ă-irradiation in the proton form of synthetic rho zeolite exposed to CH4 have been investigated by electron paramagnetic resonance (EPR) in the temperature range 110-370 K. Depending on the methane adsorption temperature two EPR spectra of oCH3 radicals were recorded. The isotropic quartet observed after CH4 adsorption at room temperature was assigned to oCH3 radicals freely rotating in the middle of octagonal prism. After adsorption at 413 K, the isotropic quartet is overlapped with the second signal characterized with anisotropy of hyperfine splitting and g-value. It is postulated that anisotropic signal represents the oCH3 radicals located in á-cages and strongly interacting with silicaalumina framework. The mechanisms of radiolytic formation of methyl radicals and the possible stabilization sites are also discussed.
    Źródło:
    Nukleonika; 2005, 50,suppl.2; 51-54
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electron paramagnetic resonance studies on silver atoms and clusters in regularly interstratified clay minerals
    Autorzy:
    Yamada, H.
    Sadlo, J.
    Tamura, K.
    Shimomura, S.
    Turek, J.
    Michalik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147360.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    EPR spectroscopy
    regularly interstratified clay minerals
    silver atoms
    gamma irradiation
    Opis:
    The formation and stabilization of reduced silver species in the regularly interstratified clay minerals, trioctahedral smectite/chlorite (tri-Sm/Ch) and dioctahedral smectite/mica (di-Sm/M), have been studied by electron paramagnetic resonance (EPR) spectroscopy. Both minerals loaded with Ag+ cations after degassing and dehydration were g-irradiated at 77 K and monitored by EPR as the temperature increased. Some samples were exposed to water or methanol vapor after dehydration. In both hydrated and dehydrated samples only the doublets assigned to Ag0 atoms were observed with no evidence of the formation of Ag clusters. However, the EPR parameters of silver atoms in both matrices are different. In tri-Sm/Ch the narrow anisotropic EPR lines overlap with the broader isotropic lines, whereas in di-Sm/M only broad lines are recorded. The hyperfine splitting - Aiso(Ag0) is larger in tri-Sm/Ch than in di-Sm/M. Also the stability of Ag0 in both clay minerals is distinctly different. Ag0 doublet in di-Sm/M disappears completely above 230 K, whereas in tri-Sm/Ch it is still recorded at 310 K. It is proposed, basing on the EPR results that Ag0 atoms appear at different sites in both matrices: - in tri-Sm/Ch in the middle of smectite interlayer and in hexagonal cavities in the silicate sheets of tetrahedron layer and in di-Sm/M in hexagonal cavities only. When samples had been exposed to methanol before irradiation, the silver clusters become stabilized in the interlayer sites. In tri- Sm/Ch matrix the silver dimer Ag2+ formed by g-irradiation at 77 K is transformed to tetrameric cluster, Ag43+ at 150 K. In di-Sm/M the radiation-induced silver agglomeration proceeds in a similar way, but with a slower rate and Ag tetramer is formed only above 190 K. In both clay minerals, Ag43+ clusters decay above 250 K.
    Źródło:
    Nukleonika; 2004, 49, 4; 131-136
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR study on biominerals as materials for retrospective dosimetry
    Autorzy:
    Sadło, J.
    Michalik, J.
    Stachowicz, W.
    Strzelczak, G.
    Dziedzic-Gocławska, A.
    Ostrowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146095.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    dosimetry
    EPR dating
    accidental dosimetry
    hydroxyapatite
    Opis:
    Stable paramagnetic species, induced by irradiation in biominerals, can be successfully used as an EPR dosimeter in numerous domains of scientific activity. In hydroxyapatite, the main mineral component of bones, the most stable signal is assigned to CO2 - ion radical. The signal is dose dependent and allows to determine the absorbed dose in a wide range till 20 kGy, with detection limit for tooth enamel below 1 Gy. The additive dose method was applied to EPR dating of archeological objects and EPR dosimetry after accidental overexposing during radiotherapy. It was found that the age of remains excavated from the “tomb of giants” belonging to Nuraghic culture developed in Sardinia island is about 3160 years old (1160 years BC). The dose obtained by patients during the accident at the Białystok Oncological Center was evaluated at about 75 Gy. Searching for potential dosimeters among other biominerals shows that mollusc shells have very promising properties. The lowest dose detection limit was found for an Arcidae shell. Both fresh water and sea mollusc shells are useful to be used for dosimetry in the low dose range.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 95-100
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The correlation between the meteorological conditions and the concentration of radionuclides in the ground layer of atmospheric air
    Autorzy:
    Krajny, E.
    Ośródka, L.
    Wojtylak, M.
    Michalik, B.
    Skowronek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148116.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    atmospheric air
    meteorology
    neural network
    radionuclides
    Opis:
    The main goal of this work was to find correlation between the concentrations of radionuclides in outdoor air and the meteorological conditions like: air temperature, atmospheric pressure, wind velocity and amount of precipitation. Because the sampling period of radionuclides concentrations in air was relatively long (7 days), the average levels of meteorological parameters have been calculated within the same time. Data of radionuclide concentrations and meteorological data have been analyzed in order to find statistical correlation. The regression analysis and one of the AI methods, known as neural network, were applied. In general, analysis of the gathered data does not show any strong correlation between the meteorological conditions and the concentrations of radionuclides in air. A slightly stronger correlation we found for radionuclides with relatively short half-lives. The only positive correlation has been found between the Be-7 concentration and air temperature (at the significance level á=0.05). In our opinion, the lack of correlation was caused by a too long sampling time in measurements of radionuclides in outdoor air (a whole week). Results of the analysis received by means of the artificial neuron network are better. We were able to find certain groups of meteorological conditions, related with the corresponding concentrations of particular radionuclides in air. Preliminary measurements of radon progeny concentration support the thesis that the link between changes of meteorological parameters and concentrations of radionuclides in ambient air must exist.
    Źródło:
    Nukleonika; 2001, 46, 4; 189-194
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-15 z 15

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