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Wyszukujesz frazę "Kowal, P." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    A Simulation Model of the Radio Frequency MIMO-OFDM System
    Autorzy:
    Kowal, M.
    Kubal, S.
    Piotrowski, P.
    Zieliński, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226276.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MIMO-OFDM
    Simulink
    simulator
    Opis:
    The paper presents a simulation model of the radio frequency MIMO-OFDM system. The simulation model was made in Matlab Simulink environment. It contains the transmitter, the receiver and the telecommunication channel models. The telecommunication channel model consists of models used during development of technical documentation of IEEE 802.11n. Signals generated at the transmitter output are fully compatible with signals described in IEEE 802.11n [1]. Simulations are conducted on a radio frequency, so they can be compared with results of measurements of real systems.
    Źródło:
    International Journal of Electronics and Telecommunications; 2011, 57, 3; 323-328
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Operational characteristic of wireless WiMax and IEEE 802.11x systems in underground mine environments
    Autorzy:
    Kowal, M.
    Kubal, S.
    Piotrowski, P.
    Zieliński, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/227021.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WLAN
    WiMAX
    throughput
    delay
    mine environment
    Opis:
    The paper presents research results pertaining to transmission parameters of wireless communication systems, based on WiMax and IEEE 802.11x radio interfaces. Research was performed in severe operating conditions of an underground mine - testing various parameters, such as: throughput, delays and maximum range.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 1; 81-86
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the Production Process of High-Strength Products from Aluminum-Magnesium Alloys for their Direct Processing into Sheets Via Cold Rolling
    Autorzy:
    Ściężor, W.
    Mamala, A.
    Kowal, R.
    Kwaśniewski, P.
    Franczak, K.
    Strzępek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/353274.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloys
    twin roll casting
    cold rolling
    hardness
    Opis:
    Modern metal forming processes of non-ferrous metals, particularly aluminum and its alloys, are increasingly based on integrated technologies combining numerous operations in one process line. The subject of this paper focuses on the possibility of using materials after mould casting (simulating a continuous casting process between cylindrical crystallizers - Twin Roll Casting method) for the direct cold rolling process. As a part of this research a pilotage study on metallurgical synthesis and mould casting process of Al-Mg alloys with the magnesium contents of 5%-10%, testing their mechanical, electrical and structural properties as well as susceptibility to cold plastic deformation. This process was carried out with the measurement of strength parameters and confirmed the possibility of cold rolling alloys with a casting structure without prior hot deformation.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1487-1493
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Mechanical Properties of Strips Obtained in TRC Line
    Autorzy:
    Mamala, A.
    Ściężor, W.
    Kwaśniewski, P.
    Grzebinoga, J.
    Kowal, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/352065.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    twin roll casting
    hardness
    anisotropy
    segregation
    Opis:
    Twin Roll Casting technology belongs to modern, integrated method of processing aluminum and its alloys. This method includes preparation of liquid metal and its continuous casting between the rotating cylindrical crystallizers, optional homogenizing treatment, cold rolling and optional interoperation or final heat treatment. Final products of TRC method are strips with a thickness from few to several millimeters, which can be directly subjected to cold rolling process to afford a sheet. Properties of final product are limited by the material’s condition, its chemical composition and also selected path of its processing technology. The paper presents research results of chemical composition and mechanical properties of strips obtained in Twin Roll Casting processing line.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1101-1108
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Metallic Additives to Polymer Matrix on Properties of Composite Adhesives Dedicated for Light Metal Joining
    Autorzy:
    Mamala, A.
    Kwaśniewski, P.
    Nowak, A.
    Grzebinoga, J.
    Ściężor, W.
    Kowal, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/353945.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polymer-metal composites
    thermal conductivity
    epoxy matrix adhesives
    reinforcement with particles of non-ferrous metals
    Opis:
    The most recent and promising trends in development of renewable sources of energy are Combined Heat and Power (CHP) systems. The newest solutions from this field are hybrid compact solar panels. The correct operation of both systems, i.e. the photovoltaic panel and the heat exchanger requires an effective connection between the two. The adhesives utilized to interconnect above elements should provide a stable and hermetic joint able to withstand mechanical and thermal impacts of the surrounding environment factors. The paper presents the research results over the impact of the type and the amount of reinforcing phase on the physical and mechanical properties of epoxy resin matrix composites reinforced with particles of non-ferrous metals (Ag, Cu, W, Al), dedicated as adhesives for connections between photovoltaic panels and heat exchangers. Based on the experimental findings the usefulness of classical analytic models for valuation of polymer-metal composites properties was validated.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2287-2294
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of Mechanical and Electrical Properties and Structure of Selected Aluminum Alloy Sheets Produced from TRC Semi-Products
    Autorzy:
    Ścięźor, W.
    Kiesiewicz, G.
    Kowal, R.
    Franczak, K.
    Grzebinoga, J.
    Mamala, A.
    Kwaśniewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/351003.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    twin roll casting
    cold rolling
    structure
    hardness
    electrical conductivity
    Opis:
    Modern manufacturing methods of non-ferrous metals, especially aluminum and its alloys, are more and more often based on integrated technologies combining multiple operations in a single process. One of the most popular methods for producing flat components by cold working is twin roll casting technology (TRC). It allows to eliminate from manufacturing the extremely expensive hot rolling operation, as the TRC semi-product (strip) can be directly cold rolled. The results of mechanical and electrical properties and structure examination of strips after casting were presented in the paper. The effect of cold rolling parameters on post-process mechanical properties and structure of sheets was investigated too.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2237-2245
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Al-Ag Alloys for Electrical Conductors with Increased Current Carrying Capacity
    Autorzy:
    Mamala, A.
    Knych, T.
    Kwaśniewski, P.
    Kawecki, A.
    Kiesiewicz, G.
    Sieja-Smaga, E.
    Ściężor, W.
    Gniełczyk, M.
    Kowal, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/353878.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    new Al-Ag alloys
    electrical conductors
    increased current carrying capacity
    Opis:
    The paper shows a new idea of aluminium alloys. New alloys with specially selected alloying element i.e. silver have electrical conductivity similar to pure aluminium at ambient temperature and better than pure aluminium electrical conductivity at increased temperatures. Al-Ag alloys for electrical applications (mainly for electrical conductors) due to high electrical conductivity at increased temperatures at the level of the maximum conductor working temperatures give possibility of better current capacity of conductors. The experimental results of basic mechanical properties and the electric conductivity versus temperature relation are shown in the paper as well as examples of the tested material operational properties. The summary gives theoretical analysis based on examples of the potential applications of Al-Ag alloys (new conductor designs) which provide the benefits of the new solutions in comparison to traditional conductors.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1875-1880
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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