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    Wyświetlanie 1-6 z 6
    Tytuł:
    Investigating the Possibility of Regenearation by Hardfacing for Forging Tools Based on Analysis of Tool Working Conditions and Wear Evaluationy
    Autorzy:
    Widomski, Paweł
    Kaszuba, Marcin
    Krawczyk, Jakub
    Nowak, Bartłomiej
    Lange, Artur
    Sokołowski, Paweł
    Gronostajski, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2176476.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    forging tool
    regeneration
    hardfacing
    wear
    Opis:
    Tests were performed on example tools applied in hot die forging processes. After withdrawal from service due to excessive wear, these tools can be regenerated for re-use through machining and hardfacing. First, analysis of worn tools was carried out for the purpose of identifying tool working conditions and wear mechanisms occurring in the surface layer of tools during forging. Testing of worn tools included observations under a microscope, surface scanning and microhardness measurement in the surface layer. The results indicate very diverse work conditions, which suggest the application of different materials and hardfacing tool regeneration technology in individual die forging processes.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1395--1410
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption chiller in a combined heating and cooling system: simulation and optimization by neural networks
    Autorzy:
    Krzywanski, Jarosław
    Sztekler, Karol
    Bugaj, Marcin
    Kalawa, Wojciech
    Grabowska, Karolina
    Chaja, Patryk Robert
    Sosnowski, Marcin
    Nowak, Wojciech
    Mika, Łukasz
    Bykuć, Sebastian
    Powiązania:
    https://bibliotekanauki.pl/articles/2128167.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adsorption heat pump
    polygeneration
    cooling capacity
    low grade thermal energy
    artificial neural networks
    soft computing
    absorpcyjna pompa ciepła
    poligeneracja
    wydajność chłodnicza
    energia cieplna niskiej jakości
    sztuczne sieci neuronowe
    przetwarzanie miękkie
    Opis:
    Adsorption cooling and desalination technologies have recently received more attention. Adsorption chillers, using eco-friendly refrigerants, provide promising abilities for low-grade waste heat recovery and utilization, especially renewable and waste heat of the near ambient temperature. However, due to the low coefficient of performance (COP) and cooling capacity (CC) of the chillers, they have not been widely commercialized. Although operating in combined heating and cooling (HC) systems, adsorption chillers allow more efficient conversion and management of low-grade sources of thermal energy, their operation is still not sufficiently recognized, and the improvement of their performance is still a challenging task. The paper introduces an artificial intelligence (AI) approach for the optimization study of a two-bed adsorption chiller operating in an existing combined HC system, driven by low-temperature heat from cogeneration. Artificial neural networks are employed to develop a model that allows estimating the behavior of the chiller. Two crucial energy efficiency and performance indicators of the adsorption chiller, i.e., CC and the COP, are examined during the study for different operating sceneries and a wide range of operating conditions. Thus this work provides useful guidance for the operating conditions of the adsorption chiller integrated into the HC system. For the considered range of input parameters, the highest CC and COP are equal to 12.7 and 0.65 kW, respectively. The developed model, based on the neurocomputing approach, constitutes an easy-to-use and powerful optimization tool for the adsorption chiller operating in the complex HC system.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e137054, 1--11
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption chiller in a combined heating and cooling system: simulation and optimization by neural networks
    Autorzy:
    Krzywanski, Jarosław
    Sztekler, Karol
    Bugaj, Marcin
    Kalawa, Wojciech
    Grabowska, Karolina
    Chaja, Patryk Robert
    Sosnowski, Marcin
    Nowak, Wojciech
    Mika, Łukasz
    Bykuć, Sebastian
    Powiązania:
    https://bibliotekanauki.pl/articles/2173577.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adsorption heat pump
    polygeneration
    cooling capacity
    low grade thermal energy
    artificial neural networks
    soft computing
    absorpcyjna pompa ciepła
    poligeneracja
    wydajność chłodnicza
    energia cieplna niskiej jakości
    sztuczne sieci neuronowe
    przetwarzanie miękkie
    Opis:
    Adsorption cooling and desalination technologies have recently received more attention. Adsorption chillers, using eco-friendly refrigerants, provide promising abilities for low-grade waste heat recovery and utilization, especially renewable and waste heat of the near ambient temperature. However, due to the low coefficient of performance (COP) and cooling capacity (CC) of the chillers, they have not been widely commercialized. Although operating in combined heating and cooling (HC) systems, adsorption chillers allow more efficient conversion and management of low-grade sources of thermal energy, their operation is still not sufficiently recognized, and the improvement of their performance is still a challenging task. The paper introduces an artificial intelligence (AI) approach for the optimization study of a two-bed adsorption chiller operating in an existing combined HC system, driven by low-temperature heat from cogeneration. Artificial neural networks are employed to develop a model that allows estimating the behavior of the chiller. Two crucial energy efficiency and performance indicators of the adsorption chiller, i.e., CC and the COP, are examined during the study for different operating sceneries and a wide range of operating conditions. Thus this work provides useful guidance for the operating conditions of the adsorption chiller integrated into the HC system. For the considered range of input parameters, the highest CC and COP are equal to 12.7 and 0.65 kW, respectively. The developed model, based on the neurocomputing approach, constitutes an easy-to-use and powerful optimization tool for the adsorption chiller operating in the complex HC system.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e137054
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of the Late Bronze Age Foundry Process in Greater Poland: Analyzes and Simulations. Case Study of Hoard from Przybysław
    Autorzy:
    Garbacz-Klempka, Aldona
    Piękoś, Marcin
    Perek-Nowak, Małgorzata
    Kozana, Janusz
    Żak, Paweł
    Fijołek, Andrzej
    Silska, Patrycja
    Stróżyk, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2134106.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    archaeometallurgy
    copper alloys
    casting
    CALPHAD
    computer modeling
    Late Bronze Age
    Opis:
    One of the most interesting categories of artifacts for archaeometallurgical research includes deposits of bronze items, so-called “metallurgists hoards”. They contain, aside of final products, many fragments of raw material and, moreover, metallurgical tools. An important source for the studies on the history of metallurgical technology is hoard from Przybysław, Greater Poland district. Thus, the aim of the work is the identification and interpretation of bronze-working practices and strategies adopted by prehistoric communities of the Late Bronze Age and the Early Iron Age (ca. 600 BC). The examined objects are characterized in terms of their design, structure, and chemical composition. The methods chosen for the studies of artifacts include: metallographic macro- and microscopic observations using optical microscopy (OM) and scanning electron microscopy (SEM), the analysis of chemical composition with the methods of energy dispersive X-ray spectroscopy (EDS), and X-ray fluorescence (ED-XRF). The thermodynamic analysis of the alloys was performed on the basis of the CALPHAD method. The experimental melts allowed to verify the theoretical considerations and to determine the characteristic temperatures of changes. The old casting technology can be analyzed basing on computer modeling and computer simulation methods. Simulations in the MAGMASOFT® software are a good example to illustrate how to fill a mould cavity with a molten bronze for a hoop ornament. It is also an appropriate tool to determine temperature distribution in a mould. The simulations also show the possible disadvantages with this old technology.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 3; 1125--1136
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Współczesne przemiany czynników rozwoju społeczno-gospodarczego
    Autorzy:
    Konecka-Szydłowska, Barbara
    Churski, Paweł
    Dolata, Michał
    Dominiak, Joanna
    Hauke, Jan
    Herodowicz, Tomasz
    Nowak, Adam
    Perdał, Robert
    Woźniak, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/2021556.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    socio-economic development factor
    megatrends
    human capital
    social capital
    material capital
    financial capital
    innovations
    Nauki Humanistyczne i Społeczne
    Źródło:
    Studia komitetu przestrzennego zagospodarowania kraju PAN; 2018, 183; 67-88
    0079-3507
    Pojawia się w:
    Studia komitetu przestrzennego zagospodarowania kraju PAN
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oblężona twierdza – prawda – hierarchia. Wokół kodeksu etyki PTH
    Besieged fortress – truth – hierarchy. On the Code of Ethics by the Polish Historical Society
    Autorzy:
    Brzezińska, Anna
    Falkowski, Tomasz
    Kowalewski Jahromi, Piotr
    Kula, Artur
    Kuligowska, Aleksandra
    Muchowski, Jakub
    Nowak, Katarzyna
    Stasiak, Marcin
    Tatarenko, Agata
    Wiśniewski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2080710.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ethical Code of Polish Historical Society
    public history
    history as a discipline
    community of historians
    Kodeks etyki PTH
    historia publiczna
    historia jako dyscyplina
    środowisko historyków
    Nauki Humanistyczne i Społeczne
    Opis:
    The article is a commentary on the Code of Ethics of the Polish Historical Association published in March 2021. In the first part of the article, we critically discuss the Code using the metaphor of a “besieged fortress” and the categories of hierarchy and truth. In our view, by taking a defensive position, reproducing hierarchical relations within the community of historians and in relation to the public, and by placing the category of truth at the centre of the principles of the discipline, the authors of the Code do not respond to the contemporary challenges facing history. In the second part, we postulate the rebuilding of the Code on the basis of the categories of dialogue, polyphony and democracy, and we propose a number of amendments to its content.
    Źródło:
    Historyka studia metodologiczne; 2021, 51; 313-323
    0073-277X
    Pojawia się w:
    Historyka studia metodologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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