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    Wyświetlanie 1-9 z 9
    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:
    Structure and properties of nanomaterials produced by severe plastic deformation
    Autorzy:
    Pakieła, Z.
    Garbacz, H.
    Lewandowska, M.
    Drużycka-Wiencek, A.
    Suś-Ryszkowska, M.
    Zieliński, W.
    Kurzydłowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146207.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    nanocrystalline metals
    severe plastic deformation
    mechanical properties
    Opis:
    In recent years, a number of methods for refining the structure of metals by severe plastic deformation (SPD) have been developed. Some of those methods permit grain refinement to a nanometric level. These methods include, among others, high pressure torsion (HPT), equal channel angular pressing (ECAP) and hydrostatic extrusion (HE). The aim of this paper was a more detailed description of these methods and presentation of exemplary applications of these methods for structure refinement and improvement of mechanical properties of chosen materials. The results obtained in the present study show that the microstructures of the materials subjected to SPD studied in this work displayed considerable refinement, characterised by the formation of nanosized grains. Such a refinement resulted in increased tensile strength and hardness of the SPD materials studied in this work. In view of the results obtained on a large number of metals and alloys, a conclusion can be drawn that SPD could become an attractive way of processing materials for variety of applications.
    Źródło:
    Nukleonika; 2006, 51,suppl.1; 19-25
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of the compress sensing theory for improvement of the TOF resolution in a novel J-PET instrument
    Autorzy:
    Raczyński, L.
    Moskal, P.
    Kowalski, P.
    Wiślicki, W.
    Bednarski, T.
    Białas, P.
    Czerwiński, E.
    Gajos, A.
    Kapłon, Ł.
    Kochanowski, A.
    Korcyl, G.
    Kowal, J.
    Kozik, T.
    Krzemień, W.
    Kubicz, E.
    Niedźwiecki, S.
    Pałka, M.
    Rudy, Z.
    Salabura, P.
    Gupta-Sharma, N.
    Silarski, M.
    Słomski, A.
    Smyrski, J.
    Strzelecki, A.
    Wieczorek, A.
    Zieliński, M.
    Zoń, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/146280.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    compressed sensing
    positron emission tomography
    time-of-flight
    Opis:
    Nowadays, in positron emission tomography (PET) systems, a time of fl ight (TOF) information is used to improve the image reconstruction process. In TOF-PET, fast detectors are able to measure the difference in the arrival time of the two gamma rays, with the precision enabling to shorten signifi cantly a range along the line-of-response (LOR) where the annihilation occurred. In the new concept, called J-PET scanner, gamma rays are detected in plastic scintillators. In a single strip of J-PET system, time values are obtained by probing signals in the amplitude domain. Owing to compressive sensing (CS) theory, information about the shape and amplitude of the signals is recovered. In this paper, we demonstrate that based on the acquired signals parameters, a better signal normalization may be provided in order to improve the TOF resolution. The procedure was tested using large sample of data registered by a dedicated detection setup enabling sampling of signals with 50-ps intervals. Experimental setup provided irradiation of a chosen position in the plastic scintillator strip with annihilation gamma quanta.
    Źródło:
    Nukleonika; 2016, 61, 1; 35-39
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of hit time and hit position of annihilation quanta in the J-PET detector using the Mahalanobis distance
    Autorzy:
    Sharma, N. G.
    Silarski, M.
    Bednarski, T.
    Białas, P.
    Czerwiński, E.
    Gajos, A.
    Gorgol, M.
    Jasińska, B.
    Kamińska, D.
    Kapłon, Ł.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krzemień, W.
    Kubicz, E.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Rundel, O.
    Słomski, A.
    Strzelecki, A.
    Wieczorek, A.
    Wiślicki, W.
    Zieliński, M.
    Zgardzińska, B.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/146937.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    J-PET detector
    Mahalanobis distance
    time resolution
    threshold levels
    Opis:
    The J-PET detector being developed at the Jagiellonian University is a positron emission tomograph composed of the long strips of polymer scintillators. At the same time, it is a detector system that will be used for studies of the decays of positronium atoms. The shape of photomultiplier signals depends on the hit time and hit position of the gamma quantum. In order to take advantage of this fact, a dedicated sampling front-end electronics that enables to sample signals in voltage domain with the time precision of about 20 ps and novel reconstruction method based on the comparison of examined signal with the model signals stored in the library has been developed. As a measure of the similarity, we use the Mahalanobis distance. The achievable position and time resolution depend on the number and values of the threshold levels at which the signal is sampled. A reconstruction method as well as preliminary results are presented and discussed.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 1; 765-769
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studies of unicellular microorganisms Saccharomyces cerevisiae by means of positron annihilation lifetime spectroscopy
    Autorzy:
    Kubicz, E.
    Jasińska, B.
    Zgardzińska, B.
    Bednarski, T.
    Białas, P.
    Czerwiński, E.
    Gajos, A.
    Gorgol, M.
    Kamińska, D.
    Kapłon, Ł.
    Kochanowski, A.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krzemień, W.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Rajfur, Z.
    Rudy, Z.
    Rundel, O.
    Sharma, N. G.
    Silarski, M.
    Słomski, A.
    Strzelecki, A.
    Wieczorek, A.
    Wiślicki, W.
    Zieliński, M.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147902.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    environmental scanning electron microscopy (ESEM)
    free volume
    inverted microscopy
    positron annihilation
    positronium
    yeasts
    Opis:
    Results of positron annihilation lifetime spectroscopy (PALS) and microscopic studies on simple microorganisms, brewing yeasts, are presented. Lifetime of ortho-positronium (o-Ps) were found to change from 2.4 to 2.9 ns (longer-lived component) for lyophilized and aqueous yeasts, respectively. Also hygroscopicity of yeasts in time was examined, allowing to check how water – the main component of the cell – affects PALS parameters, thus lifetime of o-Ps were found to change from 1.2 to 1.4 ns (shorter-lived component) for the dried yeasts. The time sufficient to hydrate the cells was found below 10 hours. In the presence of liquid water, an indication of reorganization of yeast in the molecular scale was observed. Microscopic images of the lyophilized, dried, and wet yeasts with best possible resolution were obtained using inverted microscopy (IM) and environmental scanning electron microscopy (ESEM) methods. As a result, visible changes to the surface of the cell me mbrane were observed in ESEM images.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 1; 749-753
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix
    Autorzy:
    Wieczorek, A.
    Zgardzińska, B.
    Jasińska, B.
    Gorgol, M.
    Bednarski, T.
    Białas, P.
    Czerwiński, E.
    Gajos, A.
    Kamińska, D.
    Kapłon, Ł.
    Kochanowski, A.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krzemień, W.
    Kubicz, E.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Rundel, O.
    Sharma, N. G.
    Silarski, M.
    Silarski, A.
    Strzelecki, A.
    Wiślicki, W.
    Zieliński, M.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147132.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    free volume
    positron annihilation
    polystyrene
    positronium
    scintillator
    Opis:
    The polystyrene doped with 2,5-diphenyloxazole as a primary fluor and 2-(4-styrylphenyl)benzoxazole as a wavelength shifter prepared as a plastic scintillator was investigated using positronium probe in wide range of temperatures from 123 to 423 K. Three structural transitions at 260, 283, and 370 K were found in the material. In the o-Ps intensity dependence on temperature, the significant hysteresis is observed. Heated to 370 K, the material exhibits the o-Ps intensity variations in time.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 1; 777-781
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Searches for discrete symmetries violation in ortho-positronium decay using the J-PET detector
    Autorzy:
    Kamińska, D.
    Gajos, A.
    Czerwiński, E.
    Bednarski, T.
    Białas, P.
    Gorgol, M.
    Jasińska, B.
    Kapłon, Ł.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krzemień, W.
    Kubicz, E.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Rundel, O.
    Sharma, N. G.
    Silarski, M.
    Słomski, A.
    Strzelecki, A.
    Wieczorek, A.
    Wiślicki, W.
    Zieliński, M.
    Zgardzińska, B.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/147408.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    discrete symmetries
    J-PET
    ortho-positronium
    Opis:
    In this paper, we present prospects for using the Jagiellonian positron emission tomograph (J-PET) detector to search for discrete symmetries violations in a purely leptonic system of the positronium atom. We discuss tests of CP and CPT symmetries by means of ortho-positronium decays into three photons. No zero expectation values for chosen correlations between ortho-positronium spin and momentum vectors of photons would imply the existence of physics phenomena beyond the standard model. Previous measurements resulted in violation amplitude parameters for CP and CPT symmetries consistent with zero, with an uncertainty of about 10−3. The J-PET detector allows to determine those values with better precision, thanks to the unique time and angular resolution combined with a high geometrical acceptance. Achieving the aforementioned is possible because of the application of polymer scintillators instead of crystals as detectors of annihilation quanta.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 1; 729-732
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing optimization with parallel computing for the J-PET scanner
    Autorzy:
    Krzemień, W.
    Bała, M.
    Bednarski, T.
    Białas, P.
    Czerwiński, E.
    Gajos, A.
    Gorgol, M.
    Jasińska, B.
    Kamińska, D.
    Kapłon, Ł.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Kubicz, E.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Rundel, O.
    Sharma, N. G.
    Silarski, M.
    Słomski, A.
    Stola, K.
    Strzelecki, A.
    Trybek, D.
    Wieczorek, A.
    Wiślicki, W.
    Zieliński, M.
    Zgardzińska, B.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/148285.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    data aquisition system (DAQ)
    parallel computing
    TOF-PET
    Opis:
    The Jagiellonian Positron Emission Tomograph (J-PET) collaboration is developing a prototype time of flight (TOF)-positron emission tomograph (PET) detector based on long polymer scintillators. This novel approach exploits the excellent time properties of the plastic scintillators, which permit very precise time measurements. The very fast fi eld programmable gate array (FPGA)-based front-end electronics and the data acquisition system, as well as low- and high-level reconstruction algorithms were specially developed to be used with the J-PET scanner. The TOF-PET data processing and reconstruction are time and resource demanding operations, especially in the case of a large acceptance detector that works in triggerless data acquisition mode. In this article, we discuss the parallel computing methods applied to optimize the data processing for the J-PET detector. We begin with general concepts of parallel computing and then we discuss several applications of those techniques in the J-PET data processing.
    Źródło:
    Nukleonika; 2015, 60, No. 4, part 1; 745-748
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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