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    Wyświetlanie 1-24 z 24
    Tytuł:
    Visual assessment of voice disorders in patients with occupational dysphonia
    Autorzy:
    Kosztyla-Hojna, B.
    Moskal, D.
    Kuryliszyn-Moskal, A.
    Rutkowski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/50941.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2014, 21, 4
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adaptive Learning: Context and Complexity
    Autorzy:
    Dziuban, Charles
    Howlin, Colm
    Dr. Moskal, Patsy D.
    Dr. Johnson, Connie
    Eid, Mitchell
    Kmetz, Brandon
    Powiązania:
    https://bibliotekanauki.pl/articles/426270.pdf
    Data publikacji:
    2018
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Tematy:
    online courses
    academic achievement
    adaptive learning
    blended learning
    digital learning
    college students
    educational strategies
    Opis:
    Adaptive learning technologies impact higher education by modifying the traditional time constraints placed on the learning cycle, thus permitting students to compress or expand their learning spaces. Previous work by the authors has demonstrated dimensional stability in the adaptive process across universities with considerably different strategic initiatives. However, a prevailing question remains about the correspondence of student position on those components. Transformed component scores for the four stable dimensions (knowledge acquisition, engagement, growth and communication) have been contrasted for comparability in beginning Algebra, College Algebra and Nursing courses at the University of Central Florida and the Colorado Technical University on several metrics generated by the Realizeit adaptive learning platform. The results indicated considerable variability in student affinity for the underlying dimensions depending on a number of considerations such as course length, subject area, and the instructional design process. The authors have concluded that adaptive learning is a complex system in which the interaction of the elements becomes more important than individual measures for understanding the emergent property of this learning environment. Finally, they contend that the potential value added of adaptive learning must be carefully considered with respect to its opportunity cost.
    Źródło:
    e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie; 2018, 5 (77); 13-23
    1731-6758
    1731-7428
    Pojawia się w:
    e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investment in gold as an example of alternative investment - in the context of capital market in Poland
    Inwestycje w złoto jako przykład inwestycji alternatywnej w kontekście rynku kapitałowego w Polsce
    Autorzy:
    Moskal, A.
    Zawadzka, D
    Powiązania:
    https://bibliotekanauki.pl/articles/399483.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    commodity funds
    gold market
    traditional and alternative forms of investment
    fundusze surowcowe
    rynek złota
    tradycyjne i alternatywne formy inwestowania
    Opis:
    This article focuses on the issues related to the characteristics of the gold market in the world and in Poland. Its aim is to assess the effectiveness of investment in the gold market in the years 2001-2013, compared with rates of return that investors could obtain during this period by investing capital in the so-called traditional forms of investment (relating to investment portfolios, which consist of two basic classes of traditional assets: stocks and bonds). The underlying research thesis was that in the years 201-2013 investments in the gold market were more profitable than investments in traditional instruments under the conditions of the Stock Exchange in Warsaw. Methods of analysis based on tracking error (TE) and information ratio (IR) were used, designated for investment funds in the gold market in Poland. These results were compared with the values for the portfolio benchmark, which were set on the level of the market price of gold.
    W niniejszym artykule skupiono się na zagadnieniach związanych z charakterystyką rynku złota na świecie oraz w Polsce. Podjęto próbę oceny efektywności inwestycji na rynku złota w latach 2001-2013 w porównaniu ze stopami zwrotu, które inwestorzy mogli uzyskać, lokując kapitał poprzez tradycyjne formy inwestowania. Poddano również analizie osiągnięte współczynniki korelacji, odchylenia standardowego oraz błąd odwzorowania (TE) i wskaźnik informacyjny (IR) towarzyszące uwzględnionym w badaniu funduszom inwestycyjnym rynku złota. Wyniki te zestawiono z wartością wykorzystanych w analizie wskaźników uzyskanych dla portfela wzorcowego, za który przyjęto ceny na rynku złota. Przybliżono możliwości inwestycyjne na rynku złota w Polsce oraz postawiono hipotezę, która stanowi, iż w uwzględnionym okresie inwestycje na rynku złota były bardziej zyskowne niż w przypadku inwestycji na rynku giełdowym, jak i założono, że fundusze surowcowe lokujące kapitał na rynku złota spełniły swój cel inwestycyjny i były silnie skorelowane z cenami złota.
    Źródło:
    Ekonomia i Zarządzanie; 2014, 6, 3; 330-343
    2080-9646
    Pojawia się w:
    Ekonomia i Zarządzanie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Oxidation Resistance of Laser Remelted Plasma Sprayed Nicraly Coating
    Autorzy:
    Niemiec, D.
    Moskal, G.
    Carski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/351807.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NiCrAlY coatings
    laser remelted
    oxidation resistance
    Opis:
    The article presents results of research relating to the impact of laser treatment done to the surface of plasma sprayed coatings NiCrAlY. Analysis consisted microstructure and oxidation resistance of coatings subjected to two different laser melting surfaces. The test were performed at a temperature 1000°C the samples were removed from the furnace after 25, 300, 500, 750 and 1000 hours. The investigations range included analysis of top surface of coatings by XRD characterization oxides formed types and microscopic investigations of coatings morphology
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1183-1191
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, Characterization and Thermal Diffusivity of Holmium and Praseodymium Zirconates
    Autorzy:
    Stopyra, M.
    Niemiec, D.
    Moskal, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/352244.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    pyrochlores
    synthesis
    polymerized-complex method
    holmium zirconate
    praseodymium zirconate
    thermal diffusivity
    Opis:
    A2B2O7 oxides with pyrochlore or defected fluorite structure are among the most promising candidates for insulation layer material in thermal barrier coatings. The present paper presents the procedure of synthesis of holmium zirconate Ho2Zr2O7 and praseodymium zirconate Pr2Zr2O7 via Polymerized-Complex Method (PCM). Thermal analysis of precursor revealed that after calcination at relatively low temperature (700°C) fine-crystalline, single-phase material is obtained. Thermal diffusivity was measured in temperature range 25-200°C, Ho2Zr2O7 exhibits lower thermal diffusivity than Pr2Zr2O7. Additionally, PrHoZr2O7 was synthesized. The powder in as-calcined condition is single-phase, but during the sintering decomposition of solid solution took place and Ho-rich phase precipitated. This material exhibited the best insulating properties among the tested ones.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1249-1254
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of NiCrAlY Coatings Roughness on Oxidation Kinetics During Static Oxidation Test at Temperature 1000ºC And 1100ºC
    Wpływ przygotowania powierzchni na kinetykę utleniania warstw typu NiCrAlY pod wpływem statycznego utleniania w temperaturze 1000ºC i 1100ºC
    Autorzy:
    Niemiec, D.
    Moskal, G.
    Jasik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/353011.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NiCrAlY coatings
    oxidation kinetics
    surface condition
    powłoka NiCrAlY
    kinetyka utleniania
    stan powierzchni
    Opis:
    The article presents the results of research related to the impact of pretreatment plasma sprayed NiCrAlY coating on the kinetics of the oxidation. The analysis covered the shell subjected to thermal spraying. The test were performed at a temperature of 1000ºC and 1100ºC the samples were removed from the furnace after 25, 300, 500, 750 and 1000 hours. The investigations range included analysis of top surface of coatings by XRD characterization oxides formed types and microscopic investigations of coatings morphology.
    W artykule zaprezentowano wyniki badań odnoszące się do wpływu przygotowania powierzchni natryskanej plazmowo powłoki NiCrAlY na kinetykę jej utleniania. Analiza obejmowała powłoki poddane natryskiwaniu cieplnemu. Testy wykonano w temperaturze 1000ºC i 1100ºC próbki zostały wyjęte z pieca po 25, 300, 500, 750 i 1000 godzinach. Przy analizie stanu warstwy wierzchniej powłok wykorzystano badania dyfrakcyjne określające skład fazowy i badania mikroskopowe umożliwiające ocenę budowy warstwy.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 2671-2680
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Oxide Scales Formed on Different Co-Ni Based Superalloys During Isothermal Oxidation at 800 and 900°C
    Autorzy:
    Migas, D.
    Kierat, M.
    Moskal, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049616.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    γ–γ′ cobalt-based superalloys
    high temperature oxidation
    Co-Ni superalloy
    W-free cobalt superalloys
    Opis:
    In this investigation, the formation of oxide scales on different Co-Ni based superalloys of γ–γ′ type was analyzed. Co-20Ni-7Al-7W (at.%) alloy as well as its W-free modifications based on Co-Ni-Al-Mo-Nb and Co-Ni-Al-Ta systems was analyzed under conditions of high temperature oxidation at 800 and 900°C. Therefore, the alloys were isothermally oxidized at selected temperatures for 100 h in laboratory furnace. Afterwards, the oxidation products were evaluated by means of X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM). The performed tests showed that W-free alloys exhibit worse oxidation resistance compared to those of Co-Ni-Al-W alloys. After oxidation at 900°C, all alloys were prone of oxide spallation. The scales characterized by oxide peeling were mostly composed of complex Co-based oxides, including CoWO4, CoTa2O6, Co2Mo3O8, CoNb2O6.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 5-14
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Project of the Underwater System for Chemical Threat Detection
    Autorzy:
    Silarski, M.
    Hunik, D.
    Moskal, P.
    Smolis, M.
    Tadeja, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402638.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    28.41.Ak
    89.20.Dd
    28.20.Cz
    28.20.Fc
    Opis:
    In this article we describe a novel method for the detection of explosives and other hazardous substances in the marine environment using neutron activation. Unlike the other considered methods based on this technique we propose to use guides for neutron and gamma quanta which speeds up and simplifies identification. Moreover, it may provide a determination of the density distribution of a dangerous substance. First preliminary results of Monte Carlo simulations dedicated for design of a device exploiting this method are also presented.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1543-1547
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Achievements in horizontal gene transfer studies in parasitic plants
    Autorzy:
    Góralski, G.
    Denysenko-Bennett, M.
    Burda, A.
    Staszecka-Moskal, N.
    Kwolek, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2142106.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    evolution
    HGT
    horizontal gene transfer
    hosts
    parasitic plants
    Opis:
    Horizontal gene transfer (HGT) is a process that allows genetic material to flow between even distantly related organisms. It is primarily observed in bacteria and protists but also in different lineages of eucaryotes. The first HGT cases in plants were discovered at the beginning of the 21st century and have been intensively studied ever since. Researchers have placed particular emphasis on the plant kingdom, especially parasitic plants. This review presents the current state of knowledge about this phenomenon in plants, with a special focus on parasitic plants. Among the described factors facilitating HGT, close physical contact between organisms is believed to be one of the most important. It is noted especially in the case of parasitism and similar relationships. For that reason, reported occurrences of this phenomenon in holoparasites, hemiparasites, and mycoheterotrophic plants are compared. The mechanisms responsible for HGT in plants still remain unclear, however, the studies described here suggest that both DNA and RNA may play a role as a carrier in that process. Also, the transfer between genomes of different organelles in the cell, intracellular gene transfer (IGT), and its relationships with HGT are described. The occurrence of the HGT and IGT phenomena concerning different genomes: nuclear, mitochondrial, and plastid is discussed in the review. Finally, some future areas of research in the field are proposed.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2021, 63, 2; 17-28
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis Framework for the J-PET Scanner
    Autorzy:
    Krzemień, W.
    Gajos, A.
    Gruntowski, A.
    Stola, K.
    Trybek, D.
    Bednarski, T.
    Białas, P.
    Czerwiński, E.
    Kamińska, D.
    Kapłon, Ł.
    Kochanowski, A.
    Korcyl, G.
    Kowal, J.
    Kowalski, P.
    Kozik, T.
    Kubicz, E.
    Moskal, P.
    Niedźwiecki, Sz.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Salabura, P.
    Sharma, N.
    Silarski, M.
    Słomski, A.
    Smyrski, J.
    Strzelecki, A.
    Wieczorek, A.
    Wiślicki, W.
    Zieliński, M.
    Zoń, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402621.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.57.nf
    87.57.uk
    29.85.-c
    Opis:
    J-PET analysis framework is a flexible, lightweight, ROOT-based software package which provides the tools to develop reconstruction and calibration procedures for PET tomography. In this article we present the implementation of the full data-processing chain in the J-PET framework which is used for the data analysis of the J-PET tomography scanner. The framework incorporates automated handling of PET setup parameters' database as well as high level tools for building data reconstruction procedures. Each of these components is briefly discussed.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1491-1494
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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
    Tytuł:
    Time Calibration of the J-PET Detector
    Autorzy:
    Skurzok, M.
    Silarski, M.
    Alfs, D.
    Białas, P.
    Shivani, S.
    Curceanu, C.
    Czerwiński, E.
    Dulski, K.
    Gajos, A.
    Głowacz, B.
    Gorgol, M.
    Hiesmayr, B.
    Jasińska, B.
    Kisielewska-Kamińska, D.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krawczyk, N.
    Krzemień, W.
    Kubicz, E.
    Mohammed, Muhsin
    Pawlik-Niedźwiecka, M.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Raj, J.
    Rudy, Z.
    Sharma, N.
    Sharma, S.
    Shopa, R.
    Wieczorek, A.
    Wiślicki, W.
    Zgardzińska, B.
    Zieliński, M.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033283.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.20.fb
    36.10.Dr
    11.30.Er
    24.80.+y
    Opis:
    The Jagiellonian positron emission tomograph project carried out in the Institute of Physics of the Jagiellonian University is focused on construction and tests of the first prototype of PET scanner for medical diagnostic which allows for the simultaneous 3D imaging of the whole human body using organic scintillators. The J-PET prototype consists of 192 scintillator strips forming three cylindrical layers which are optimized for the detection of photons from the electron-positron annihilation with high time-and high angular resolutions. In this article we present time calibration and synchronization of the whole J-PET detection system by irradiating each single detection module with a ²²Na source and a small detector providing common reference time for synchronization of all the modules.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1641-1644
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    GPU Accelerated Image Reconstruction in a Two-Strip J-PET Tomograph
    Autorzy:
    Białas, P.
    Kowal, J.
    Strzelecki, A.
    Bednarski, T.
    Czerwiński, E.
    Gajos, A.
    Kamińska, D.
    Kapłon, Ł.
    Kochanowski, A.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krzemień, W.
    Kubicz, E.
    Moskal, P.
    Niedźwiecki, Sz.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Rundel, O.
    Salabura, P.
    Sharma, N.
    Silarski, M.
    Słomski, A.
    Smyrski, J.
    Wieczorek, A.
    Wiślicki, W.
    Zieliński, M.
    Zoń, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402623.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.57.nf
    87.57.uk
    Opis:
    We present a fast GPU implementation of the image reconstruction routine, for a novel two strip PET detector that relies solely on the time of flight measurements.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1500-1504
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    Preliminary studies of J-PET detector spatial resolution
    Autorzy:
    Pawlik-Niedźwiecka, M.
    Niedźwiecki, S.
    Alfs, D.
    Białas, P.
    Curceanu, C.
    Czerwiński, E.
    Dulski, K.
    Gajos, A.
    Głowacz, B.
    Gorgol, M.
    Hiesmayr, B.
    Jasińska, B.
    Kisielewska, D.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krawczyk, N.
    Krzemień, W.
    Kubicz, E.
    Mohammed, M.
    Pałka, M.
    Raczyński, L.
    Raj, J.
    Rudy, Z.
    Shivani, -
    Silarski, M.
    Skurzok, M.
    Sharma, N.
    Sharma, S.
    Shopa, R.
    Strzelecki, A.
    Wieczorek, A.
    Wiślicki, W.
    Zgardzińska, B.
    Zieliński, M.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1057928.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.40.Mc
    87.57.uk
    87.10.Rt
    34.50.-s
    Opis:
    The J-PET detector, based on long plastic scintillator strips, was recently constructed at the Jagiellonian University. It consists of 192 modules axially arranged into three layers, read out from both sides by digital constant-threshold front-end electronics. This work presents preliminary results of measurements of the spatial resolution of the J-PET tomograph performed with ²²Na source placed at selected position inside the detector chamber.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1645-1648
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    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:
    Hit Time and Hit Position Reconstruction in the J-PET Detector Based on a Library of Averaged Model Signals
    Autorzy:
    Moskal, P.
    Sharma, N.
    Silarski, M.
    Bednarski, T.
    Białas, P.
    Bułka, J.
    Czerwiński, E.
    Gajos, A.
    Kamińska, D.
    Kapłon, L.
    Kochanowski, A.
    Korcyl, G.
    Kowal, J.
    Kowalski, P.
    Kozik, T.
    Krzemień, W.
    Kubicz, E.
    Niedźwiecki, Sz.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Rundel, O.
    Salabura, P.
    Słomski, A.
    Smyrski, J.
    Strzelecki, A.
    Wieczorek, A.
    Wiślicki, W.
    Wochlik, I.
    Zieliński, M.
    Zoń, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402622.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.57.uk
    07.05.Kf
    Opis:
    In this article we present a novel method of hit time and hit position reconstruction in long scintillator detectors. We take advantage of the fact that for this kind of detectors amplitude and shape of registered signals depend strongly on the position where particle hits the detector. The reconstruction is based on determination of the degree of similarity between measured and averaged signals stored in a library for a set of well-defined positions along the scintillator. Preliminary results of validation of the introduced method with experimental data obtained by means of the double strip prototype of the J-PET detector are presented.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1495-1499
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multiple Scattering and Accidental Coincidences in the J-PET Detector Simulated Using GATE Package
    Autorzy:
    Kowalski, P.
    Moskal, P.
    Wiślicki, W.
    Raczyński, L.
    Bednarski, T.
    Białas, P.
    Bułka, J.
    Czerwiński, E.
    Gajos, A.
    Gruntowski, A.
    Kamińska, D.
    Kapłon, Ł.
    Kochanowski, A.
    Korcyl, G.
    Kowal, J.
    Kozik, T.
    Krzemień, W.
    Kubicz, E.
    Niedźwiecki, Sz.
    Pałka, M.
    Rudy, Z.
    Salabura, P.
    Sharma, N.
    Silarski, M.
    Słomski, A.
    Smyrski, J.
    Strzelecki, A.
    Wieczorek, A.
    Wochlik, I.
    Zieliński, M.
    Zoń, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402625.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    29.40.Mc
    87.57.uk
    87.10.Rt
    34.50.-s
    Opis:
    Novel positron emission tomography system, based on plastic scintillators, is developed by the J-PET collaboration. In order to optimize geometrical configuration of built device, advanced computer simulations are performed. Detailed study is presented of background given by accidental coincidences and multiple scattering of gamma quanta.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1505-1512
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Pilot Study of the Novel J-PET Plastic Scintillator with 2-(4-styrylphenyl)benzoxazole as a Wavelength Shifter
    Autorzy:
    Wieczorek, A.
    Moskal, P.
    Niedźwiecki, S.
    Bednarski, T.
    Białas, P.
    Czerwiński, E.
    Danel, A.
    Gajos, A.
    Gruntowski, A.
    Kamińska, D.
    Kapłon, Ł.
    Kochanowski, A.
    Korcyl, G.
    Kowal, J.
    Kowalski, P.
    Kozik, T.
    Krzemień, W.
    Kubicz, E.
    Molenda, M.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Rundel, O.
    Salabura, P.
    Sharma, N.
    Silarski, M.
    Słomski, A.
    Smyrski, J.
    Strzelecki, A.
    Uchacz, T.
    Wiślicki, W.
    Zieliński, M.
    Zoń, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402620.pdf
    Data publikacji:
    2015-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.57.uk
    29.40.Mc
    Opis:
    For the first time a molecule of 2-(4-styrylphenyl)benzoxazole containing benzoxazole and stilbene groups is applied as a scintillator dopant acting as a wavelength shifter. In this article a light yield of the plastic scintillator, prepared from styrene doped with 2 wt% of 2,5-diphenylbenzoxazole and 0.03 wt% of 2-(4-styrylphenyl)benzoxazole, is determined to be as large as 60% ± 2% of the anthracene light output. There is a potential to improve this value in the future by the optimization of the additives concentrations.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 5; 1487-1490
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Method to Produce Linearly Polarized Positrons and Positronium Atoms with the J-PET Detector
    Autorzy:
    Mohammed, Muhsin
    Białas, P.
    Curceanu, C.
    Czerwiński, E.
    Dulski, K.
    Gajos, A.
    Głowacz, B.
    Gorgol, M.
    Hiesmayr, B.
    Jasińska, B.
    Kisielewska, D.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krawczyk, N.
    Krzemień, W.
    Kubicz, E.
    Pawlik-Niedźwiecka, M.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Raj, J.
    Rudy, Z.
    Sharma, N.
    Sharma, S.
    Shivani, ---
    Skurzok, M.
    Silarski, M.
    Wieczorek, A.
    Wiślicki, W.
    Zgardzińska, B.
    Zieliński, M.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030045.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    41.75.Fr
    41.75.Ht
    77.22.Ej
    36.10.Dr
    85.75.Mm
    87.57.uk
    Opis:
    A method for creating linearly polarized positrons and ortho-positronium (o-Ps) atoms with the J-PET detector is presented. The unique geometry and properties of the J-PET tomography enable one to design a positron source such that the quantization axis for the estimation of the linear polarization of produced o-Ps can be determined on the event by event basis in a direction of the positron motion. We intend to use ²²Na or other β⁺ decay isotopes as a source of polarized positrons. Due to the parity violation in the beta decay, the emitted positrons are longitudinally polarized. The choice of the quantization axis is based on the known position of the positron emitter and the reconstructed position of the positronium annihilation. We show that the J-PET tomography is equipped with all needed components.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1486-1489
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis Procedure of the Positronium Lifetime Spectra for the J-PET Detector
    Autorzy:
    Dulski, K.
    Zgardzińska, B.
    Białas, P.
    Curceanu, C.
    Czerwiński, E.
    Gajos, A.
    Głowacz, B.
    Gorgol, M.
    Hiesmayr, B.
    Jasińska, B.
    Kisielewska-Kamińska, D.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krawczyk, N.
    Krzemień, W.
    Kubicz, E.
    Mohammed, Muhsin
    Pawlik-Niedźwiecka, M.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Raj, J.
    Rudy, Z.
    Sharma, N.
    Sharma, S.
    Shivani, Shivani
    Shopa, R.
    Silarski, M.
    Skurzok, M.
    Wieczorek, A.
    Wiślicki, W.
    Zieliński, M.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033298.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.05.Kf
    13.30.Ce
    14.60.-z
    78.47.-p
    Opis:
    Positron annihilation lifetime spectroscopy has shown to be a powerful tool to study the nanostructures of porous materials. Positron emission tomograph is a device allowing imaging of metabolic processes e.g. in human bodies. A newly developed device, the Jagiellonian PET will allow positron annihilation lifetime spectroscopy in addition to imaging, thus combining both analyses providing new methods for physics and medicine. In this contribution we present a computer program that is compatible with the Jagiellonian PET software. We compare its performance with the standard program LT 9.0 by using positron annihilation lifetime spectroscopy data from hexane measurements at different temperatures. Our program is based on an iterative procedure, and our fits prove that it performs as good as LT 9.0.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1637-1640
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Human tissue investigations using PALS technique - free radicals influence
    Autorzy:
    Jasińska, B.
    Zgardzińska, B.
    Chołubek, G.
    Pietrow, M.
    Gorgol, M.
    Wiktor, K.
    Wysogląd, K.
    Białas, P.
    Curceanu, C.
    Czerwiński, E.
    Dulski, K.
    Gajos, A.
    Głowacz, B.
    Hiesmayr, B.
    Jodłowska-Jędrych, B.
    Kamińska, D.
    Korcyl, G.
    Kowalski, P.
    Kozik, T.
    Krawczyk, N.
    Krzemień, W.
    Kubicz, E.
    Mohammed, Muhsin
    Pawlik-Niedźwiecka, M.
    Niedźwiecki, S.
    Pałka, M.
    Raczyński, L.
    Rudy, Z.
    Sharma, N.
    Sharma, S.
    Shopa, R.
    Silarski, M.
    Skurzok, M.
    Wieczorek, A.
    Wiktor, H.
    Wiślicki, W.
    Zieliński, M.
    Moskal, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1057941.pdf
    Data publikacji:
    2017-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    positron annihilation
    positronium
    free radicals
    tissues
    uterine leiomyomas
    Opis:
    The positron annihilation lifetime spectroscopy was applied to the samples of the human uterine leiomyomas and the normal myometrium tissues taken from the selected place of the uterus during a surgery. The method indicated differences in values of the measured positron annihilation lifetime spectroscopy parameters (lifetimes and intensities) between healthy and diseased tissue samples. The additional measurements were performed either in darkness or in presence of visible light which influenced the free radicals present in both kind of tissues and, as a result, made changes in free annihilation and o-Ps decay lifetime and intensity values.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 5; 1556-1558
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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