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    Wyświetlanie 1-9 z 9
    Tytuł:
    Type of modulation identification using Wavelet Transform and Neural Network
    Autorzy:
    Walenczykowska, M.
    Kawalec, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/201661.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    modulation identification
    artificial neural networks
    continuous wavelet transform (CWT)
    identyfikacja modulacji
    sztuczne sieci neuronowe (SSN)
    transformacja falkowa (CWT)
    Opis:
    Automatic recognition of the signal modulation type turned out to be useful in many areas, including electronic warfare or surveillance. The wavelet transform is an effective way to extract signal features for identification purposes. In this paper there are M-ary ASK, M-ary PSK, M-ary FSK, M-ary QAM, OOK and MSK signals analysed. The mean value, variance and central moments up to five of continuous wavelet transform (CWT) are used as signal features. The principal component analysis (PCA) is applied to reduce a number of features. A multi-layer neural network trained with backpropagation learning algorithm is considered as a classifier. There are two research variants: interclass and intraclass recognition with a wide range of signal-to-noise ratio (SNR).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 257-261
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Wall Thickness and Mould Temperature on Structure and Properties of Thin Wall Ductile Iron Castings
    Autorzy:
    Górny, M.
    Kawalec, M.
    Witek, G.
    Rejek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/382589.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallography
    mechanical properties
    ductile iron
    austenitic ductile iron
    high Ni alloying
    mould temperature
    thin wall casting
    metalografia
    właściwości mechaniczne
    metal ciągliwy
    żeliwo sferoidalne
    Opis:
    The excellent property combination of thin wall ductile iron castings (TWDI), including thin wall alloyed cast iron (e.g. austenitic TWDI) has opened new horizons for cast iron to replace steel castings and forgings in many engineering applications with considerable cost benefits. TWDI is considered as a potential material for the preparation of light castings with good mechanical and utility properties, the cost of which is relatively low. In this study, unalloyed and high Ni-alloyed (25% Ni) spheroidal graphite cast iron, with an austenitic metallic matrix were investigated. The research was conducted for thin-walled iron castings with 2, 3 and 5mm wall thickness, using different mould temperature (20°C, and 160°C) to achieve various cooling rates. The metallographic examinations i.e. characteristic of graphite nodules, metallic matrix, and primary grains of austenite dendrites (in high-nickel NTWDI) and mechanical properties were investigated. The study shows that homogeneity of the casting structure of thin-walled castings varies when changing the wall thickness and mould temperature. Finally, mechanical properties of thin-walled ductile iron castings with ferritic-pearlitic and austenitic metallic matrix have been shown.
    Źródło:
    Archives of Foundry Engineering; 2019, 2; 55-59
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An analysis of Chosen Image Formation Algorithms for Synthetic Aperture Radar with FMCW
    Autorzy:
    Okoń-Fąfara, M.
    Serafin, P.
    Kawalec, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/227061.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    signal processing
    synthetic aperture radar
    time domain correlation
    range-Doppler algorithm
    range migration algorithm
    Opis:
    The modelling of FMCW SAR systems, due to long signal duration time, commonly used start-stop approximation for pulsed radars causes errors in the image. Continuous motion of the radar platform results in additional range-azimuth couplings and range walk term that should be considered in processing of signal from this type of radar. The paper presents an analysis of the following algorithms: Time Domain Correlation (TDC), Range Doppler Algorithm (RDA), and Range Migration Algorithm (RMA). The comparison of the algorithms is based on theoretical estimation of their computation complexity and the quality of images obtained on the basis of real signals of FMCW SAR systems.
    Źródło:
    International Journal of Electronics and Telecommunications; 2016, 62, 4; 323-328
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prototype of Wideband Air Sonar Based on STM32
    Autorzy:
    Okoń-Fąfara, M.
    Kawalec, A.
    Fąfara, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/176827.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    imaging air sonar
    STM32
    ultrasonic transducer
    Opis:
    The paper presents a project of a low-cost prototype version of a wideband air sonar and the problems occurring during its development process. The aim of this work was to design a short range air sonar capable of creating the reflectivity map of its surroundings using an arbitrary shape wideband signal. The transmitting and receiving transducers that have been chosen for this application typically work in pulsed operation modes. Therefore, dedicated output and input circuits had to be designed to expand its capabilities without information losses. The signal generation, transmission, reception and storage are managed by a Discovery evaluation board with a STM32 microcontroller. The receiving data are saved on a SD card and are processed off-line.
    Źródło:
    Archives of Acoustics; 2017, 42, 4; 761-765
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Abrasive Wear Resistance of Chromium Cast Iron
    Autorzy:
    Kopyciński, D.
    Piasny, S.
    Kawalec, M.
    Madizhanova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381907.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    abrasive wear resistance
    white cast iron
    carbides
    odporność na ścieranie
    żeliwo białe
    węgliki
    Opis:
    The resistance of cast iron to abrasive wear depends on the metal abrasive hardness ratio. For example, hardness of the structural constituents of the cast iron metal matrix is lower than the hardness of ordinary silica sand. Also cementite, the basic component of unalloyed white cast iron, has hardness lower than the hardness of silica. Some resistance to the abrasive effect of the aforementioned silica sand can provide the chromium white cast iron containing in its structure a large amount of (Cr, Fe)7C3 carbides characterised by hardness higher than the hardness of the silica sand in question. In the present study, it has been anticipated that the white cast iron structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand the application area of castings under the harsh operating conditions of abrasive wear. Moreover, the study compares the results of abrasive wear resistance tests performed on the examined types of cast iron. Tests of abrasive wear resistance were carried out on a Miller machine. Samples of standard dimensions were exposed to abrasion in a double to-and-fro movement, sliding against the bottom of a trough filled with an aqueous abrasive mixture containing SiC + distilled water. The obtained results of changes in the sample weight were approximated with a power curve and shown further in the study.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1; 63-66
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthetic Aperture Radar Using Emitters of Opportunity
    Autorzy:
    Serafin, P.
    Kawalec, A.
    Leśnik, C.
    Pyć, M.
    Pietrasiński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226408.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Synthetic Aperture Radar (SAR)
    passive SAR
    Opis:
    The capability of a radar imaging system to stay undetected while gathering data is one of the most desired for military reconnaissance systems. This is particularly difficult to achieve for synthetic aperture radar (SAR), that have to emit electromagnetic energy all the time during the operation and to move along a strictly defined route. Therefore the idea of a passive imaging system although encountering many constraints seems to be very interesting. The possibilities of a passive synthetic aperture radar system working with different types of emitters of opportunity are described in the paper. Impact of signal characteristics on image quality and geometry issues are discussed among others. Results of computer simulations of such a system implementing different imaging algorithms as well as the results of the experiment performed with passive SAR system model are presented.
    Źródło:
    International Journal of Electronics and Telecommunications; 2012, 58, 4; 357-362
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the structure and abrasive wear resistance of white cast iron with precipitates of carbides
    Analiza struktury oraz odporność na zużycie ścierne żeliwa białego z wydzieleniami węglików
    Autorzy:
    Kopyciński, D.
    Kawalec, M.
    Szczęsny, A.
    Gilewski, R.
    Piasny, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/351529.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    abrasive wear resistance
    white cast iron
    intermetallic phase
    type of carbides: (Fe,Cr)3C
    (Fe,Cr)7C3
    VC
    TiC
    odporność na ścieranie
    żeliwo białe
    fazy międzymetaliczne
    węgliki typu (Fe, Cr)3C (Fe, Cr)7C3
    Opis:
    The resistance of castings to abrasive wear depends on the cast iron abrasive hardness ratio. It has been anticipated that the white cast iron structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand the application area of castings under the harsh operating conditions of abrasive wear. Detailed metallographic analysis was carried out to see the structure obtained in selected types of white cast iron, i.e. with additions of chromium and vanadium. The study compares the results of abrasive wear resistance tests performed on the examined types of cast iron.
    Odporność żeliwa na zużycie ścierne zależy od stosunku twardości metalu i ścierniwa. W pracy założono kształtowanie struktury żeliwa białego w wyniku zmiany rodzaju osnowy metalowej oraz węglików, co znacznie rozszerza obszar zastosowania odlewu w trudnych warunkach zużycia ściernego. Przeprowadzono szczegółowa analizę metalograficzną struktury wybranych gatunków żeliwa białego t.j.: chromowego oraz wanadowego. W niektórych przypadkach zaproponowano koncepcje sterowania ilością i rodzajem węglików w osnowie metalowej żeliwa lub wprowadzania dodatkowych węglików do struktury eutektycznej tego rodzaju żeliwa. Ponadto w pracy porównano wyniki badań odporności na zużycie ścierne analizowanych gatunków żeliwa.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 3; 973-976
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Was reduced pollen viability in Viola tricolor L. the result of heavy metal pollution or rather the tests applied?
    Autorzy:
    Slomka, A
    Kawalec, P.
    Kellner, K.
    Jedrzejczyk-Korycinska, M.
    Rostanski, A.
    Kuta, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/19806.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    We used different tests to assess the effect of high soil concentrations of heavy metals on pollen viability in plants from metallicolous (MET) and nonmetallicolous (NONMET) populations. The frequency of viable pollen depended on the test applied: MET plants showed no significant reduction of pollen viability by acetocarmine, Alexander, MTT and X-Gal dye testing, but a drastic reduction of pollen viability in MET flowers (MET 56% vs 72% NONMET) by the FDA test. There was no correlation between pollen viability estimated in histochemical tests and pollen germination in vitro or in vivo. We discuss the terminology used to describe pollen viability as determined by histochemical tests.
    Źródło:
    Acta Biologica Cracoviensia. Series Botanica; 2010, 52, 1; 123-127
    0001-5296
    Pojawia się w:
    Acta Biologica Cracoviensia. Series Botanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sensors and systems for the detection of explosive devices - an overview
    Autorzy:
    Bielecki, Z.
    Janucki, J.
    Kawalec, A.
    Mikołajczyk, J.
    Pałka, N.
    Pasternak, M.
    Pustelny, T.
    Stacewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/221624.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    explosive device sensors
    detection of explosive materials
    Opis:
    The paper presents analyses of current research projects connected with explosive material sensors. Sensors are described assigned to X and γ radiation, optical radiation sensors, as well as detectors applied in gas chromatography, electrochemical and chemical sensors. Furthermore, neutron techniques and magnetic resonance devices were analyzed. Special attention was drawn to optoelectronic sensors of explosive devices.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 1; 3-28
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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