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    Wyświetlanie 1-7 z 7
    Tytuł:
    Using CUDA architecture for computer simulations of thermomechanical phenomena
    Autorzy:
    Michalski, G.
    Sczygiol, N.
    Leonov, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/973633.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    numerical modeling
    solidification
    distributed and parallel processing
    CUDA
    modelowanie numeryczne
    krzepnięcie
    przetwarzanie rozproszone i równoległe
    Opis:
    This paper presents a simulation of the casting solidification process performed on graphics processors compatible with nVidia CUDA architecture. Indispensable for the parallel implementation of a computer simulation of the solidification process, it was necessary to modify the numerical model. The new approach shown in this paper allows the process of matrix building to be divided into two independent phases. The first is independent from the nodal temperature values computed in successive time-steps. The second is performed on the basis of nodal temperature values, but does not require a description of the finite element mesh. This phase is performed in each time step of the simulation of the casting solidification process. The separation of these two phases permits an effective implementation of the simulation software of the casting solidification process on the nVidia CUDA architecture or any other multi-/manycore architecture. The use of GPUs nVidia for the implementation of a computer simulation of the solidification process significantly reduced the waiting time for results. In the course of computer simulations important speedup of the computations was observed.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 3; 167-174
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and characterization of high-molar-mass star-shaped poly(l-lactide)s
    Synteza i charakterystyka gwiaździstych poli(l-laktydów) o dużych masach molowych
    Autorzy:
    Michalski, A.
    Łapienis, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/947098.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    poly(l-lactide)
    stabilization
    DSC
    NMR
    thermal properties
    poli(l-laktyd)
    stabilizacja
    właściwości termiczne
    Opis:
    The synthesis of high-molar-mass linear and 6-arm star-shaped poly(l-lactide)s(PLLA’s) is presented. Dipentaerythritol and benzyl alcohol were used asinitiators and Sn(Oct)2 was applied asa catalyst in the ring-opening polymerization (ROP) of l-lactide (l-LA) carried out at 130 °C. The prepared PLLA’s were characterized by SEC (size exclusion chromatography), 1H NMR (proton nuclear magnetic resonance spectroscopy), DSC (differential scanning calorimetry), and TGA (thermogravimetric analysis). The structure of the obtained star-shaped polymers was confirmed by comparison of the radii of gyration (Rg) determined by SEC for the linear and star macromolecules. The thermal properties of PLLA’s were shown for the wide range of molar masses. Additionally, it was confirmed that Irganox stabilizer has an influence on the thermal stability of PLLA’s.
    Przedstawiono syntezę liniowych i 6-ramiennych gwiaździstych poli(l-laktydów)(PLLA) o dużych masach molowych. Polimeryzację z otwarciem pierścienia (ROP) l-laktydu(l-LA) inicjowaną dipentaerytrytem oraz alkoholem benzylowym prowadzono w temperaturze130 °C wobec Sn(Oct)2 jako katalizatora. Otrzymane PLLA scharakteryzowano za pomocą SEC (chromatografia żelowa), 1HNMR (spektroskopia magnetycznego rezonansu jądrowego), DSC (różnicowa kalorymetria skaningowa) i TGA (analiza termograwimetryczna). Strukturę otrzymanych polimerów gwiaździstych potwierdzono przez porównanie wyznaczonych w SEC promieni bezwładności (Rg) dla gwiaździstych iliniowych makrocząsteczek. Właściwości termiczne PLLA przedstawiono dla szerokiego zakresu mas molowych. Dodatkowo potwierdzono, że stabilizator Irganox ma wpływ na stabilność termiczną PLLA.
    Źródło:
    Polimery; 2018, 63, 7-8; 488-494
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The weathering-modified iridium record of a new Cretaceous–Palaeogene site at Lechowka near Chelm, SE Poland, and its palaeobiologic implications
    Autorzy:
    Racki, G.
    Michalski, M.
    Koeberl, C.
    Harasimiuk, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/20009.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Cretaceous
    geochemical anomaly
    Lechowka n.Chelm
    Paleogene
    Polska
    anomaly
    biostratigraphy
    extinction
    geochemistry
    geological setting
    iridium
    lithology
    paleobiology
    paleontology
    weathering-modified iridium
    Opis:
    In the light of integrated biostratigraphic and geochemical data, a complete shallow−marine succession across the Cretaceous–Palaeogene (K–Pg) boundary, with the critical boundary clay coupled with a burrowed siliceous chalk (“opoka” in Polish geological literature), possibly equivalent of the basal Danian Cerithium Limestone in Denmark, has been discovered at Lechówka near Chełm, SE Poland. An extraterrestrial signature marking the K–Pg boundary is confirmed by anomalously high amounts of iridium (up to 9.8 ppb) and other siderophile elements (especially Au and Ni), as well as by an elevated Ir/Au ratio consistent with a chondrite meteoritic composition. The major positive iridium spike surprisingly occurs in Maastrichtian marls, 10 cm below the boundary clay interval, which can be explained by diagenetic mobilisation and re−concentration of the impact−derived components. Thus, intensively infiltrating, humic acid−rich ground waters during the long−lasting Palaeogene weathering in tropical humid regimes were probably responsible not only for the large−scale decalcification of the Lechówka section, but also for both downward displaced position of the iridium enrichment, a dispersed profile of this anomaly and its significantly lessened value, but still approaching an increase by a factor of 100. This modified record of the K–Pg boundary event points to a careful reconsideration of the iridium anomaly as a trustworthy marker for studying the extinction patterns across the K–Pg boundary, as supported by the recent data from New Jersey, USA.
    Źródło:
    Acta Palaeontologica Polonica; 2011, 56, 1
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Steel Ball Samples, Investigated before and after Nitriding
    Autorzy:
    Fuks, H.
    Kaczmarek, S. M.
    Leniec, G.
    Michalski, J.
    Kucharska, B.
    Wach, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/355956.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    EPR-FMR
    magnetization
    iron
    nitriding surface
    Opis:
    Group of steel balls with different chemical composition, diameters and nitriding treatment parameters were investigated with using magnetic resonance and magnetization methods. Emerging nitrided regions consists of diffusion and surface layer of iron nitrides. The thickness of the individual layers depends on the type of steel and process parameters. Resonance signal shape and position were successfully described in the ferromagnetic resonance regime expected for dense iron magnetic system. Influence of the sample size, thermal treatment and carbon content on the absorption signal has been analyzed. Significant magnetic anisotropy has been revealed, as well as non-usual increasing of the magnetization as a function of temperature. It suggests, that overall antiferromagnetic ordering, destroyed by thermal movement, lead to increasing of the ferromagnetic region.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1235-1242
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First molecular characterization of Dobrava-Belgrade virus found in Apodemus flavicollis in Poland
    Autorzy:
    Kolodziej, M.
    Melgies, A.
    Joniec-Wiechetek, J.
    Michalski, A.
    Nowakowska, A.
    Pitucha, G.
    Niemcewicz, M.N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2081717.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    Polska
    phylogenetic analysis
    Apodemus flavicollis
    Dobrava-Belgrade virus
    orthohantaviruses
    Opis:
    Introduction. Dobrava-Belgrade virus (DOBV) is one of the emerging pathogens which have been reported during the last decades in Europe and have attracted the attention of researchers. The course of infection among humans may have a varied course – from the completely asymptomatic to the more severe forms, such as haemorrhagic fever with renal syndrome (HFRS). DOBV is hosted and carried by rodents like Apodemus flavicollis or A. agrarius, which occur commonly in Europe. Objective. To-date, orthohantaviruses have been reported in Poland, both in humans and animals, but detailed countryscale studies have not yet been carried out. The aim of the study was molecular characterization of a strain which was found in A. flavicollis in south-eastern Poland. Materials and method. The phylogenetic analysis of the first Dobrava-Belgrade virus found in A. flavicollis in the subcarpathian region of south-eastern Poland, presented in this study, was performed after virus proliferation in cell culture and sequencing of specific PCR products. Results. Based on genetic sequences of fragments of three segments (S, M and L), the isolated virus was assigned to the Dobrava genotype, taking into consideration the most current classification of the DOBV species. Conclusions. The Dobrava-Belgrade virus strain isolated from A. flavicollis in the subcarpathian region of south-eastern Poland, has been molecularly characterized and assigned to Dobrava genotype, thereby the occurrence of that genotype in Poland has been confirmed by molecular techniques.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 368-373
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Severe Influenza Outbreak in Western Ukraine in 2009 – a molecular-epidemiological study
    Autorzy:
    Kocik, J.
    Niemcewicz, M.
    Johns, M.
    Jerke, K.
    Michalski, A.
    Bielecka, A.
    Lasocki, K.
    Gawel, J.
    Bielawska-Drozd, A.
    Joniec, J.
    Kolodziej, M.
    Graniak, G.
    Goniewicz, M.
    Kubiak, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/50555.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Introduction: In the autumn of 2009 the authors participated in a humanitarian operation in Western Ukraine by undertaking an epidemiological investigation of an influenza-like-illness (ILI) in the L’viv Oblast region. Mobile biological survey teams took samples from civilian patients with severe acute respiratory distress syndrome, rapid transportation of the samples, and their molecular analysis in Poland to provide accurate results. Objective: The aim of the study was the molecular and epidemiological analysis of the biological samples collected. Material and Methods: Real-time reverse transcriptase polymerase chain reaction (real-time RT-PCR), multiplex PCR techniques, traditional Sanger Sequencing and classical viral culture methods were used. Results: Among the 124 influenza-like illness cases, ~50% (58) were positive for influenza A virus in WHO-CDC molecular assay, including subtyping. The specimens were further analyzed to confirm results and determine the genetic sequence. Phylogenetically, the nucleotide similarity of both the Ukraine specimens and reference A/California/7/2009 (pH1N1) was 99.2–99.3%. Oseltamivir resistance was not registered. HA1 region characterization showed an overall protein identity of 98.5–99.4%. Conclusions: An unexpected high contribution of influenza A was confirmed among ILI patients, as well as a very limited number of other detected viruses, indicate that the 2009 epidemic in western Ukraine was strongly related to novel influenza A/H1N1. The importance of swift sharing of information and reference laboratories networking in surveillance, as well as serving governments and international agencies in pursuing adequate actions, should be stressed.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2013, 20, 3
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acute respiratory distress syndrome (ARDS) in the course of influenza A/H1N1v infection – genetic aspects
    Autorzy:
    Niemcewicz, M.
    Pajak, B.
    Michalski, A.
    Kocik, J.
    Kolodziej, M.
    Joniec, J.
    Graniak, G.
    Gawel, J.
    Marciniak-Niemcewicz, A.
    Kucharczyk, K.
    Prystupa, A.
    Witczak, A.
    Lasocki, K.
    Naylor, K.
    Goniewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/49651.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2013, 20, 4
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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