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    Wyświetlanie 1-5 z 5
    Tytuł:
    Dobór lotniczych czarno-białych materiałów światłoczułych dla potrzeb fotogrametrii i teledetekcji
    Autorzy:
    Dębski, W.
    Walczykowski, P.
    Żukowicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/130318.pdf
    Data publikacji:
    2004
    Wydawca:
    Stowarzyszenie Geodetów Polskich
    Tematy:
    film lotniczy
    obraz fotograficzny
    ortofotomapa
    film air
    photographic image
    orthophotomap
    Źródło:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji; 2004, 14; 1-10
    2083-2214
    2391-9477
    Pojawia się w:
    Archiwum Fotogrametrii, Kartografii i Teledetekcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Turbine stage expansion model including internal air film cooling and novel method of calculating theoretical power of a cooled stage
    Autorzy:
    Trawiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/2134930.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas turbine
    expansion line
    air film cooling
    theoretical stage power
    Opis:
    Systematic attempts to maximise the efficiency of gas turbine units are achieved, among other possibilities, by increasing the temperature at the inlet to the expansion section. This requires additional technological solutions in advanced systems for cooling the blade rows with air extracted from the compressor section. This paper introduces a new mathematical model describing the expansion process of the working medium in the turbine stage with air film cooling. The model includes temperature and pressure losses caused by the mixing of cooling air in the path of hot exhaust gases. The improvement of the accuracy of the expansion process mathematical description, compared with the currently used models, is achieved by introducing an additional empirical coefficient estimating the distribution of the cooling air along the profile of the turbine blade. The new approach to determine the theoretical power of a cooled turbine stage is also presented. The model is based on the application of three conservation laws: mass, energy and momentum. The advantage of the proposed approach is the inclusion of variable thermodynamic parameters of the cooling medium. The results were compared with the simplified models used in the literature: separate Hartsel expansion, mainstream pressure, weighted-average pressure and fully reversible. The proposed model for expansion and the determination of theoretical power allows for accurate modelling of the performance of a cooled turbine stage under varying conditions.
    Źródło:
    Archives of Thermodynamics; 2022, 43, 3; 3--27
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical estimation of film thickness with an air-assisted spray gun
    Autorzy:
    Baytok, Yusuf Mert
    Erek, Aytunc
    Saf, Orcun
    Powiązania:
    https://bibliotekanauki.pl/articles/38901122.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    air-assisted spray gun
    film thickness
    discrete phase model
    DPM
    breakup
    Opis:
    The main goal of this study is to present the effects of spraying parameters on the numerical evaluations of the fundamental behaviors of an air-assisted spray gun during the formation of child droplets in the spray flow field and material deposition on the target surface. For this purpose, first of all, the air-assisted spray gun geometry was created using the Solidworks software. Then, a computational domain with a 3D, unstructured grid structure was generated using the ANSYS-Workbench meshing tool. Numerical calculations were conducted using ANSYS-Fluent 2020-R2 commercial software. Different breakup models and their effects on the child droplet size were investigated. By coupling the Taylor analogy breakup (TAB) model and discrete phase model (DPM), the droplet size, trajectory, and coating thickness calculations were made under different atomizing air pressures. Also, the effects of spraying distance and droplet size on coating thickness and the critical Weber (We) number on the atomized particle diameter and particle speed were investigated. The results show that with the increase in atomizing air pressure, droplet sizes decrease and the film thickness on the center of the target surface and droplet speeds increases. Also, increasing the critical Weber number makes it more difficult to atomize the droplets.
    Źródło:
    Engineering Transactions; 2023, 71, 2; 241-263
    0867-888X
    Pojawia się w:
    Engineering Transactions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lithium-Ion Conductive Film Membrane of Li0.3La0.57TiO2 Perovskite Structure and its Application in Li-Air Batteries
    Autorzy:
    Rhee, Chang-Kyu
    Chun, Young-Bum
    Kang, Suk Hoon
    Kim, Whung-Whoe
    Cao, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203738.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lithium-ion conductive film
    membrane
    Li0.3La0.57TiO2
    perovskite structure
    Li-air batteries
    Opis:
    Impacts of precursor solution recipe, processing parameters, and pellet thickness on the lithium ionic conductivity of the ceramic materials with perovskite structure of Li0.3La0.57TiO3 were investigated and new method was proposed to synthesize Li0.3La0.57TiO3 solid state electrolyte. The results showed that ionic conductivity of Li0.3La0.57TiO3 membrane which was synthesized by firstly forming colloidal TiO2 (i.e., TiO2 sol) and then Li+ and La+ were added to the colloidal TiO2 was on the order of 10-5 S/cm. It also showed that the temperatures corresponding to a full decomposition for L0.3La0.57TiO3 is about 750°C and materials start forming perovskite structure when temperature reaches about 900°C and the lithium ionic conductivity gains about 21% increase when the pellet thickness is reduced to about ¼
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 191--194
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fire fighting in tanks with the use of operational inset system
    Autorzy:
    Yemialyanau, V.
    Malashanka, S.
    Charnevich, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/136862.pdf
    Data publikacji:
    2011
    Wydawca:
    Szkoła Główna Służby Pożarniczej
    Tematy:
    technology of subsurface fire extinguishing
    vertical steel tank
    fluorine-containing film-forming foam concentrate
    integrated equipment for operational inset
    storage of compressed air
    high-pressure foam generator
    Opis:
    Description of equipment set for operational inset, which is used to supply air-mechanical fire extinguishing foam in vertical steel tanks through the process of technological communication. The proposed equipment set is a promising way of petroleum and petroleum products extinguishing in vertical steel tanks, which are not equipped with stationary fire extinguishing systems of subsurface fire extinguishing.
    Źródło:
    Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej; 2011, 42; 231-234
    0239-5223
    Pojawia się w:
    Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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