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    Wyświetlanie 1-5 z 5
    Tytuł:
    Wytwarzanie powłok żaroodpornych na elementach turbin gazowych
    Application of heat-resistant coatings to gas turbine components
    Autorzy:
    Swadźba, L.
    Witala, B.
    Mendala, B.
    Komendera, Ł.
    Supernak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/109303.pdf
    Data publikacji:
    2011
    Wydawca:
    AXIS MEDIA
    Tematy:
    wytwarzanie powłok żaroodpornych
    elementy turbin gazowych
    proszkowanie
    metoda gazowa bezkontaktowa
    Opis:
    Tradycyjną metoda wytwarzania powłok żaroodpornych jest proszkowanie, które polega na umieszczeniu elementu podawanego procesowi w kontenerze z mieszaniną proszkową. Rozwinięciem tej metody jest metoda gazowa - bezkontaktowa. Jej główną cechą jest oddzielenie pokrywanych elementów od mieszaniny proszkowej: warto przyjrzeć sie jej zaletom.
    The traditional method of producing heat-resistant coatings is pack cementation, which involves embedding the component undergoing the process in a powder mixture. An extension of this method is the gas phase out-of-pack deposition, which is characterised by the fact that the parts to be coated are separated from the powder mixture. Advantages of the latter process deserve consideration.
    Źródło:
    Piece Przemysłowe & Kotły; 2011, 4; 25-30
    2082-9833
    Pojawia się w:
    Piece Przemysłowe & Kotły
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PVA hydrogel deformation in response to change in temperature or pH
    Autorzy:
    Kazimierska-Drobny, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2173595.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PVA
    hydrogels
    non-contact method
    thermal deformation
    pH sensitivity
    hydrożel
    metoda bezkontaktowa
    odkształcenie termiczne
    wrażliwość na pH
    Opis:
    Biocompatibility, biodegradability and non-toxicity are the main attributes of any material to be used in biomedical applications. Among all the potential stimuli, pH, salt and temperature exist naturally in the internal environment of the human body. Hence internal stimuli responsive hydrogels can be exploited for specific drug delivery and tissue replacement. Poly(vinyl alcohol) (PVA) is the world’s largest volume synthetic polymer, produced for its excellent chemical resistance, physical properties and complete biodegradability, which has resulted in broad practical applications. PVA could be considered a suitable host material due to its good thermo-stability, chemical resistance and film-forming ability. It is also an important material because of its large-scale applications. Novel data analysis techniques were developed to analyze the response of PVA to external stimuli, including temperature and/or pH. The presented non-contact method shows that the PVA polymer gel, physically cross-linked by freezing and thawing, shrinks and swells under the influence of temperature, which is a reversible phenomenon. Under the given conditions, such as temperature, pH and mechanical load, the dominant factor affecting the swelling or contraction of the hydrogel is the change in the temperature of the liquid in which the PVA hydrogel sample is immersed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136724
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of non-contact geodetic measurement techniques in dam monitoring
    Autorzy:
    Zaczek-Peplinska, Janina
    Kowalska, Maria
    Powiązania:
    https://bibliotekanauki.pl/articles/2173994.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inżynieria hydrotechniczna
    zapora
    monitorowanie
    pomiar geodezyjny
    metoda bezkontaktowa
    hydrotechnical engineering
    dam
    monitoring
    geodetic measurement
    non-contact technique
    Opis:
    The maintenance of dams, including the protection of reservoir and flood embankments, requires regular control measurements and assessment of their technical condition. The choice of measurement methods, especially in terms of their speed and reliability, become crucial especially when the facilities are endangered due to a natural disaster. However, despite the enormous rapid development of modern geodetic measurement techniques, measurements at most dams are still conducted using classical techniques, such as angular-linear or leveling measurements which require interference with the measured structure. In addition, they need to be personally performed by employees or require visual inspections of the structure or in its protection zone. This article presents non-contact geodetic measurement techniques, such as terrestrial laser scanning, remote sensing classification of intensity and thermovision images recorded with various measurement sensors, digital image correlation, digital photogrammetry, or UAV. They are presented and compared in terms of their reliability, efficiency and accuracy of the obtained data, and the possibility of their automation and integration. As surveyors and hydraulic and geotechnical engineers are increasingly turning to modern measurement technologies, the aim of this paper is to help in selecting appropriate and effective monitoring tools ensuring fast and safe measurements crucial for the safety and maintenance of concrete structures. It presents examples of research based on the use of the modern measuring techniques carried out in recent years by employees of the Faculty of Geodesy and Cartography at the Warsaw University of Technology.
    Źródło:
    Archives of Civil Engineering; 2022, 68, 3; 49--70
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PVA hydrogel deformation in response to change in temperature or pH
    Autorzy:
    Kazimierska-Drobny, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2090717.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PVA
    hydrogels
    non-contact method
    thermal deformation
    pH sensitivity
    hydrożel
    metoda bezkontaktowa
    odkształcenie termiczne
    wrażliwość na pH
    Opis:
    Biocompatibility, biodegradability and non-toxicity are the main attributes of any material to be used in biomedical applications. Among all the potential stimuli, pH, salt and temperature exist naturally in the internal environment of the human body. Hence internal stimuli responsive hydrogels can be exploited for specific drug delivery and tissue replacement. Poly(vinyl alcohol) (PVA) is the world’s largest volume synthetic polymer, produced for its excellent chemical resistance, physical properties and complete biodegradability, which has resulted in broad practical applications. PVA could be considered a suitable host material due to its good thermo-stability, chemical resistance and film-forming ability. It is also an important material because of its large-scale applications. Novel data analysis techniques were developed to analyze the response of PVA to external stimuli, including temperature and/or pH. The presented non-contact method shows that the PVA polymer gel, physically cross-linked by freezing and thawing, shrinks and swells under the influence of temperature, which is a reversible phenomenon. Under the given conditions, such as temperature, pH and mechanical load, the dominant factor affecting the swelling or contraction of the hydrogel is the change in the temperature of the liquid in which the PVA hydrogel sample is immersed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136724, 1--7
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New technical solutions of using rolling stock electrodynamical braking
    Nowe rozwiązanie techniczne do wykorzystania elektrodynamicznego hamowania obiektów liniowych
    Autorzy:
    Liudvinavičius, L.
    Lingaitis, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/375540.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    transport kolejowy
    układ hamulcowy
    metoda bezkontaktowa
    siła hamowania
    pojazd szynowy
    hamowanie elektrodynamiczne
    railway transport
    brake system
    non-contact method
    braking force
    rail vehicle
    electrodynamic braking
    Opis:
    The paper considers some theoretical and practical problems associated with the use of traction motor are operating in the generator mode (in braking). Mathematical and graphical relationships of electrodynamic braking, taking into account the requirements raised to braking systems in rail transport are presented. The latter include discontinuity of braking process, braking force regulation, depending on the locomotive speed, mass, type of railway and other parameters. Schematic diagrams of the locomotive braking and ways of controlling the braking force by varying electric circuit parameters are presented. The authors suggested contact-free regulation method of braking resistor for controlling braking force in rheostatic braking, and resistor parameters regulate with pulse regulation mode by semiconductor devices, such as new electrical components for rolling stock - IGBT transistors operating in the key mode. Presenting energy savings power systems, which are using regenerative braking-returning energy and diesel engine or any form of hybrid traction vehicles systems, circuit diagrams, electrical parameters curves.
    Źródło:
    Transport Problems; 2009, 4, 2; 23-35
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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