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    Wyświetlanie 1-8 z 8
    Tytuł:
    Influence of Microstructure and Heat Transfer Surface on the Thermal Power of Cast Iron Heat Exchangers
    Autorzy:
    Mróz, M.
    Orłowicz, A. W.
    Tupaj, M.
    Lenik, M.
    Kawiński, M. J.
    Kawiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079819.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vermicular cast iron
    heat exchanger
    thermal power
    calorimetric test
    żeliwo wermikularne
    wymiennik ciepła
    moc cieplna
    test kalorymetryczny
    Opis:
    The paper presents the results of calorimetric tests of segment elements of fireplace inserts. The aim of the work was to optimize their thermal power by replacing the previously used gray cast iron with flake graphite with gray iron with vermicular graphite and replacing the existing geometry of the heat transfer surface with a more developed one. It turned out that the thermal power of the test segments made of cast iron with vermicular graphite was higher compared to the segments of the same shape made of gray cast iron with flake graphite. It was found that the use of segments made of vermicular cast iron with a ferritic matrix allowed for an increase in the thermal power value by dozen percent, compared to segments of the same shape made of vermicular cast iron with a pearlitic matrix. The test results showed that the thermal power of the test segments depends on the variant of the development of both the heat receiving surface and the heat giving off surface. The highest value of the thermal power was obtained when ribbing in the form of a lattice was used on both of these surfaces, and the lowest when using flat surfaces.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 4; 93-96
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ekonomia behawioralna w polskim systemie emerytalnym
    Behavioural economics in the Polish pension system
    Autorzy:
    Kawiński, Marcin
    Sieczkowski, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2196939.pdf
    Data publikacji:
    2022
    Wydawca:
    Kancelaria Sejmu. Biuro Analiz Sejmowych
    Tematy:
    behavioural economics
    pension security system
    pension reforms
    financial planning
    Opis:
    The article explores behavioural aspects of pension schemes. It begins with fundamental changes in social security schemes, described as financialisation, marketisation and privatisation. These processes provided background for the development of behavioural mechanisms. However, in practise, behavioural economics is usually narrowed to the patterns which are most frequently used and which are believed to be effective. The goal of the article is to check this effectiveness. A detailed analysis of different pension schemes shows that this effectiveness differs significantly and cannot be considered as a default feature. The authors argue that certain behavioural mechanisms have already been used in the Polish pension scheme, and the effectiveness analysis shows that effectiveness depends on the framework of the decision-making process.
    Źródło:
    Studia BAS; 2022, 4(72); 103-121
    2080-2404
    2082-0658
    Pojawia się w:
    Studia BAS
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ductile Cast Iron Microstructure Adjustment by Means of Heat Treatment
    Autorzy:
    Mróz, M.
    Orłowicz, A. W.
    Tupaj, M.
    Kupiec, B.
    Kawiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/947626.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ductile cast iron
    heat treatment
    microstructure
    żeliwo sferoidalne
    obróbka cieplna
    mikrostruktura
    Opis:
    The study presented in this paper concerned the possibility to apply a heat treatment process to ductile cast-iron thin-walled castings in order to remove excessive quantities of pearlite and eutectic cementite precipitates and thus meet the customer’s requirements. After determining the rates of heating a casting up to and cooling down from 900°C feasible in the used production heat treatment furnace (vh = 300°C/h and vc = 200°C/h, respectively), dilatometric tests were carried out to evaluate temperatures Tgr, TAc1start, TAc1end, TAr1start, and TAr1end. The newly acquired knowledge was the base on which conditions for a single-step ferritizing heat treatment securing disintegration of pearlite were developed as well as those of a two-step ferritization process guaranteeing complete disintegration of cementite and arriving at the required ferrite and pearlite content. A purely ferritic matrix and hardness of 119 HB was secured by the treatment scheme: 920°C for 2 hours / vc = 60°C/h / 720°C for 4 hours. A matrix containing 20–45% of pearlite and hardness of 180–182 HB was obtained by applying: 920°C for 2 hours or 4 hours / vc = 200°C/h to 650°C / ambient air.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 3; 37-40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic Testing of Vermicular Cast Iron Microstructure
    Autorzy:
    Tupaj, M.
    Orłowicz, A. W.
    Mróz, M.
    Kupiec, B.
    Pająk, D.
    Kawiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837866.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vermicular cast iron
    vermiculatization method
    microstructure
    ultrasonic testing
    graphite precipitation surface density
    żeliwo wermikularne
    wermikulatyzacja
    mikrostruktura
    badanie ultradźwiękowe
    Opis:
    The paper presents results of a study on the effect of passage of time on magnesium content in iron alloys and the effect of magnesium content on the number of vermicular graphite precipitations per unit surface area and value of the longitudinal ultrasonic wave velocity for two different vermicularization methods. The study was carried out with the use of inspection bar castings. For specific production conditions, it has been found that in case of application of both the cored wire injection method and the method of pouring liquid metal over magnesium master alloy on ladle bottom, the satisfactory level of magnesium content in the bottom-pour ladle, for which it was still possible to obtain castings with vermicular graphite, was 0.018% Mg. In case of the cored wire injection method, the “time window” available to a pouring station at which castings of vermicular cast iron are expected to be obtained, was about 5 minutes. This corresponds to the longitudinal ultrasonic wave velocity values exceeding 5500 m/s and the number of graphite precipitations per unit surface area above 320 mm-2. In case of the master alloy method, the respective “time window” allowing to obtain castings of vermicular cast iron was only about 3 minutes long. This corresponds to the longitudinal ultrasonic wave velocity value above 5400 m/s and the number of graphite precipitations per unit surface area above 380 mm-2.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 36-40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Structure on Thermal Power of Cast-iron Heat Exchangers
    Autorzy:
    Mróz, M.
    Orłowicz, A. W.
    Tupaj, M.
    Jacek-Burek, M.
    Radoń, M.
    Kawiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382256.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heat exchanger
    gray cast iron
    thermal power
    wymiennik ciepła
    żeliwo szare
    ciepło
    Opis:
    The objective of the study reported in this paper was to determine the effect of structure on thermal power of cast-iron heat exchangers which in this case were furnace chambers constituting the main component of household fireplace-based heating systems and known commonly as fireplace inserts. For the purpose of relevant tests, plate-shaped castings were prepared of gray iron with flake graphite in pearlitic matrix (the material used to date typically for fireplace inserts) as well as similar castings of gray cast iron with vermicular graphite in pearlitic, ferritic-pearlitic, and ferritic matrix. For all the cast iron variants of different structures (graphite precipitate shapes and matrix type), calorimetric measurements were carried out consisting in determining the heat power which is quantity representing the rate of heat transfer to the ambient environment. It has been found that the value of the observed heat power was affected by both the shape of graphite precipitates and the type of alloy matrix. Higher thermal power values characterize plate castings of gray iron with vermicular graphite compared to plates cast of the flake graphite gray iron. In case of plates made of gray cast iron with vermicular graphite, the highest values of thermal power were observed for castings made of iron with ferritic matrix.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 27-30
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przegląd teorii finansów gospodarstw domowych w kontekście współczesnych uwarunkowań polityki publicznej
    An overview of the household finances theories in the light of contemporary public policy
    Autorzy:
    Kawiński, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/1185192.pdf
    Data publikacji:
    2015-02-02
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Tematy:
    household finances
    public policy
    life cycles
    finanse gospodarstw domowych
    polityka publiczna
    cykle życia
    Opis:
    Celem artykułu jest syntetyczna prezentacja teorii finansów gospodarstw domowych w obszarze ekonomii, socjologii oraz psychologii. Przegląd teorii, niezależnie od dziedziny nauki, pokazuje na postępujący wzrost złożoności oraz indywidualizacji finansów gospodarstw domowych. Jednocześnie rozszerzeniu uległ zakres badań (o aspekty socjologiczne i psychologiczne decyzji podejmowanych przez i w ramach gospodarstwa domowego), co przyczynia się znacząco do lepszego odwzorowania rzeczywistości w teoriach ekonomicznych. Rozwój koncepcji dotyczących funkcjonowania gospodarstw domowych wskazuje wyraźnie na rosnące znaczenie ich finansów. Nie oznacza to bynajmniej zmniejszenia roli polityki publicznej w zakresie zapewnienia bezpieczeństwa ekonomicznego gospodarstw domowych. Wręcz przeciwnie, rosnąca finansjalizacja budżetów gospodarstw domowych stawia przed polityką publiczną nowe wyzwania. Stan budżetów gospodarstw domowych coraz silniej oddziałuje na ogólną sytuację gospodarczą, a dla osiągnięcia założonego poziomu skuteczności wymagana jest większa precyzja w konstrukcji rozwiązań publicznych.
    The aim of this paper is a synthetic presentation of the theory of household finances in the area of economics, sociology and psychology. An overview of the theories, regardless of the field of science, shows a progressive increase in the complexity and individualisation of household finances. At the same time the extension of the scope of the research (of sociological and psychological aspects of decisions made by and within a household) has contributed significantly to a better representation of reality in economic theories. The development of the concept regarding the functioning of households clearly shows the growing importance of household finances. This does not mean reducing the role of public policy in ensuring the economic security of households. On the contrary, the growing financialisation of household budgets poses new challenges to public policy. The condition of household budgets increasingly affects the overall economy and in order to achieve the target level of effectiveness, greater precision in the design of public solutions is required.
    Źródło:
    Studia z Polityki Publicznej; 2015, 2, 1(5); 9-27
    2391-6389
    2719-7131
    Pojawia się w:
    Studia z Polityki Publicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Operating Performance of a Cast-Iron Heat Exchanger by Application of a Copper Alloy Coating
    Autorzy:
    Mróz, M.
    Orłowicz, A. W.
    Tupaj, M.
    Jacek-Burek, M.
    Radoń, M.
    Kawiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380088.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vermicular graphite cast iron
    CuTi2Cr coating
    heat flow rate
    heat exchanger
    improvement of performance
    żeliwo grafitowe wermikularne
    powłoka CuTi2Cr
    natężenie przepływu ciepła
    wymiennik ciepła
    poprawa wydajności
    Opis:
    The paper deals with possibility to improve operating performance of cast-iron heat exchangers by providing them with a copper alloy (CuTi2Cr) with the use of the flame spraying method. A test exchanger was cast of a gray cast iron with vermicular graphite in ferritic-pearlitic matrix obtained in production conditions at KAW-MET Iron Foundry with the wire method used to vermicularize the material. The test samples were two plates cast in sand molds, of which one was given a flame-sprayed CuTi2Cr coat on one side. The operating performance of such model cast-iron heat exchangers, with and without CuTi2Cr coating, was tested on a set-up for determining the heat flow rate (thermal power) transferred by the heat exchanger to environment. The obtained results indicate that the value of the heat flow rate characterizing the CuTi2Cr-coated cast-iron heat exchanger was by 10% higher compared to the flow rate of heat conveyed to environment by the heat exchanger without coating.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 84-87
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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