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Wyszukujesz frazę "Michalski, M.M." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Structure and Properties of Nd-Fe-B Alloy Subjected to HDDR Process
    Autorzy:
    Szymański, M.
    Michalski, B.
    Leonowicz, M.
    Miazga, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/352047.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HDDR
    magnets hydrogenation
    Nd-Fe-B alloy
    neodymium magnets
    magnets recycling
    Opis:
    In this paper the Hydrogenation, Disproportionation, Desorption and Recombination (HDDR) route was tested, for the Nd-Fe-B master alloy, as a prospective procedure for recycling of sintered scrap neodymium magnets. The HDDR method is based on the hydrogen induced reversal phase transformation of Nd-Fe-B alloy: Nd2Fe14B + (2±x) H2 = 2NdH2±x + Fe2B + 12Fe. Microstructural observations (SEM), phase constitution studies (XRD) and measurement of magnetic properties (VSM) were done to investigate the HDDR transformation progress. It was observed that disproportionation reaction starts at the grain boundaries, where the Nd-rich phase is located. Average grain size was reduced and coercive material was produced as a result of the HDDR process. Obtained results are similar to literature data.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 217-220
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A microwave plasma potential in producer gas cleaning — preliminary results with a gas derived from a sewage sludge
    Autorzy:
    Kordylewski, W.
    Michalski, J.
    Ociepa, M.
    Wnukowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175493.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sewage sludge
    gasification
    tar
    microwave plasma
    Opis:
    The paper presents an attempt to evaluate the impact of coal and coal mine methane cocombustion on the physics of the heat exchange in an 140 t/h pulverized-coal boiler through an analysis of 21 combinations of the boiler operating parameters – three different boiler loads (50, 75, and 100%) and seven values of the fired gas thermal contribution (0–60%). The obtained results are the temperature distribution of flue gas and steam in the boiler characteristic points, the heat transfer coefficient values for the boiler individual elements expressing the nature of changes in the heat transfer and the change in the boiler efficiency depending on how much gas is actually fired. An increase in the amount of co-fired gas involves a temperature increase along the flue gas path. This is the effect of the reduction in the amount of heat collected by the evaporator in the furnace. For these reason, the flue gas temperature at the furnace outlet rises by 9 K on average per a 0.1 increment in the fired gas thermal contribution. The temperature rise improves the heat transfer in the boiler heat exchangers – for the first- and the secondstage superheater the improvement totals 2.8% at a 10 pp. increase in the fired gas thermal contribution. However, the rise in the flue gas temperature at the boiler outlet involves a drop in the boiler efficiency (by 0.13 pp. for a rise in the fired gas thermal contribution by 0.1).
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2017, 137; 19-39
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sizing of prosumer hybrid renewable energy systems in Poland
    Autorzy:
    Bartecka, M.
    Terlikowski, P.
    Kłos, M.
    Michalski, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/200243.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid renewable energy system
    prosumer
    energy efficiency
    techno-economic analysis
    optimal power source sizing
    Opis:
    Nowadays the demand for renewable energy sources is constantly growing. There are several reasons of such state, including requirements for energy-efficient new buildings and reduction of greenhouse gas emissions. An exemplary solution that may help to reduce “traditional” primary energy consumption is local energy source utilization. The article presents a simplified feasibility study of hybrid energy system under Polish law and economic conditions for a self-government unit, that is legally obliged to apply means of energy efficiency improvement. The aim of this paper is to provide a simple algorithm to find optimal hybrid PV and wind power source sizing for a prosumer. Resource data used in analyses are imported from Photovoltaic Geographical Information System and cover a period of one year. The paper includes two different methodologies applied to solve the problem of optimal hybrid energy system sizing. The first approach is heuristic and based on monthly energy balancing while the second is iterative and takes into account hourly energy balance. The results from both methods are compared and verified by HomerPro software, that shows significant differences between two algorithms. At the end economic assessment based on Net Present Value method is performed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 4; 721-731
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simultaneous Measurement of the DPOAE Signal Amplitude and Phase Changes
    Autorzy:
    Michalski, W.
    Bochnia, M.
    Dziewiszek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/177027.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    signals
    double-phase-sensitive detection
    guinea pigs
    Opis:
    Although the phenomenon of otoacoustic emission has been known for nearly 30 years, it has not been fully explained yet. One kind of otoacoustic emission is distortion product of the otoacoustic emission (DPOAE). New aspects of this phenomenon are constantly discovered and attempts are made to interpret correctly the obtained results. This paper discusses a new method of measuring DPOAE signals based on double phase-sensitive detection, which makes possible a real-time measurement of the DPOAE signal amplitude and phase. The method was applied for measurements of DPOAE signals in guinea pigs. Sample records are presented and the obtained results are discussed.
    Źródło:
    Archives of Acoustics; 2011, 36, 3; 499-508
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New insights into the signaling and function of cytokinins in higher plants
    Autorzy:
    Ciesielska, A.
    Ruszkowski, M.
    Kasperska, A.
    Femiak, I.
    Michalski, Z.
    Sikorski, M.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/81076.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    signal transduction
    cytokinin
    phytohormone
    histidine
    legume plant
    symbiosis
    organogenesis
    cell division
    elongation
    differentiation
    reproduction
    sex determination
    biotic stress
    abiotic stress
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2012, 93, 4
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    E-learning jako narzędzie poprawy dostępu do edukacji akademickiej w opinii studentów i nauczycieli akademickich Uniwersytetu Gdańskiego
    E-learning as a Tool to Improve Access to Academic Education, in the Opinion of Both Students and Academics of the University of Gdańsk
    Autorzy:
    Chaberek-Karwacka, G.
    Malinowska, M.
    Michalski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2031577.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    blended learning
    niestacjonarne studia
    Uniwersytet Gdański
    extramural study programmes
    University of Gdansk
    Opis:
    Współczesne szkolnictwo wyższe w naszym kraju stoi przed licznymi wyzwaniami zewnętrznymi, takimi jak niekorzystne procesy demograficzne obniżające liczbę studentów podejmujących studia, starzenie się populacji, itd. [Demograficzne… 2011; Migracje… 2013; Sytuacja… 2014; Grzelak- -Kostulska 2016]. Dlatego też, w myśl idei „Long Life Learning” ważne jest, aby wspierać dorosłych w ukończeniu edukacji uniwersyteckiej, podnoszeniu kwalifikacji czy wreszcie dokształcaniu się w wieku podeszłym [Chabior 2001; Krawczyk 2009]. W przypadku opracowania pojęcie uczących się przez całe życie zawężono do studentów, biorących udział w procesie uczenia się, który prowadzi do uznawanych oficjalnie kwalifikacji [por. Chaberek-Karwacka 2015; Deschacht, Goeman 2015]. Zazwyczaj ponowne przystąpienie tych studentów do formalnego systemu edukacji następuje po pewnym okresie przerwy w nauce. Dodatkowo ich zaangażowanie edukacyjne różni się znacznie od młodszych studentów ze względu na rodzinę i/lub obowiązki służbowe. To powoduje, że ważne jest, aby studia przebiegały w sposób jak najbardziej dostosowany do potrzeb tej grupy studentów.
    Contemporary higher education in Poland is facing numerous challenges, such as population decline, the problem of the quality of university management, lack of skilled human resources, population aging, etc. Therefore, in accordance with the idea of Life Long Learning, it is important to support adults in their further education. It is essential that the learning process should be as convenient as possible. To facilitate education for extramural students, the Institute of Geography at the University of Gdańsk has introduced the system of blended learning. The aim of the paper is to present the results of a survey conducted among students and teaching and scientific staff of the Institute of Geography at the University of Gdańsk on the implementation of a curriculum based on the method of blended learning. Among the teachers, the idea had as many supporters as opponents. The benefits of this form of teaching, as indicated by both students and teachers, include saving time and facilitating education. Among disadvantages of e-learning, students enumerated technical problems, but above all, inconvenient hours of mandatory chats and problems with missed deadlines to submit their papers. In addition, teachers pointed out problems with assessing students’ work autonomy. The indicated problems probably arise from a lack of sufficient knowledge about e-learning methods.
    Źródło:
    Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN; 2016, 260; 108-117
    0079-3493
    Pojawia się w:
    Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN
    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
      Wyświetlanie 1-7 z 7

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