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Wyszukujesz frazę "Zieliński, S." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Is a Multi-Slider Interface Layout Responsible for a Stimulus Spacing Bias in the MUSHRA Test?
    Autorzy:
    Zieliński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/177197.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    audio quality assessment
    subjective quality evaluation
    listening tests
    psychoacoustics
    multi stimulus test with hidden reference and anchors
    MUSHRA
    Opis:
    The multi-stimulus test with hidden reference and anchors (MUSHRA) is commonly used for subjective quality assessment of audio systems. Despite its wide acceptance in scientific and industrial sectors, the method is not free from bias. One possible source of bias in the MUSHRA method may be attributed to a graphical design of its user interface. This paper examines the hypothesis that replacement of the standard multi-slider layout with a single-slider version could reduce a stimulus spacing bias observed in the MUSHRA test. Contrary to the expectation, the aforementioned modification did not reduce the bias. This outcome formally supports the validity of using multiple sliders in the MUSHRA graphical interface.
    Źródło:
    Archives of Acoustics; 2015, 40, 4; 585-594
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing capabilities of Atomic Force Microscopy by tip motion harmonics analysis
    Autorzy:
    Babicz, S.
    Smulko, J.
    Zieliński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/199918.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    atomic force microscopy (AFM)
    harmonics
    van der Waals forces
    Opis:
    Motion of a tip used in an atomic force microscope can be described by the Lennard-Jones potential, approximated by the van der Waals force in a long-range interaction. Here we present a general framework of approximation of the tip motion by adding three terms of Taylor series what results in non-zero harmonics in an output signal. We have worked out a measurement system which allows recording of an excitation tip signal and its non-linear response. The first studies of spectrum showed that presence of the second and the third harmonics in cantilever vibrations may be observed and used as a new method of the investigated samples characterization.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 535-539
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ultrasonic flow measurement with high resolution
    Autorzy:
    Grzelak, S.
    Czoków, J.
    Kowalski, M.
    Zieliński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221448.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrasonic flowmeter
    time-to-digital converter
    programmable logic device
    time measurement
    Opis:
    The ultrasonic flowmeter which is described in this paper, measures the transit of time of an ultrasonic pulse. This device consists of two ultrasonic transducers and a high resolution time interval measurement module. An ultrasonic transducer emits a characteristic wave packet (transmit mode). When the transducer is in receive mode, a characteristic wave packet is formed and it is connected to the time interval measurement module inputs. The time interval measurement module allows registration of transit time differences of a few pulses in the packet. In practice, during a single measuring cycle a few time-stamps are registered. Moreover, the measurement process is also synchronous and, by applying the statistics, the time interval measurement uncertainty improves even in a single measurement. In this article, besides a detailed discussion on the principle of operation of the ultrasonic flowmeter implemented in the FPGA structure, also the test results are presented and discussed.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 2; 305-316
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High resolution time-interval measurement systems applied to flow measurement
    Autorzy:
    Grzelak, S.
    Kowalski, M.
    Czoków, J.
    Zieliński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221586.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FPGA
    time-to-digital converter
    multi-segment delay line
    carry chain
    Opis:
    The designing process of high resolution time interval measurement systems creates many problems that need to be eliminated. The problems are: the latch error, the nonlinearity conversion, the different duty cycle coefficient of the clock signal, and the clock signal jitter. Factors listed above affect the result of measurement. The FPGA (Field Programmable Gate Array) structure also imposes some restrictions, especially when a tapped delay line is constructed. The article describes the high resolution time-to-digital converter, implemented in a FPGA structure, and the types of errors that appear there. The method of minimization and processing of data to reduce the influence of errors on the measurement is also described.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 1; 77-84
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    The silting-up prevention in the geothermal absorbent openings of Geothermal Energy Plant Pyrzyce
    Autorzy:
    Noga, B.
    Marjanowski, J.
    Biernat, H.
    Kulik, S.
    Zieliński, B.
    Nalikowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/184948.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    energia geotermalna
    absorpcja
    geothermal energy
    absorption openings
    silting-up
    soft acidising
    super soft acidising
    Opis:
    The paper presents precipitation results from cold thermal water deposits that are the main cause of clogging in absorbent geothermal wells and borehole areas. As a result of physical and chemical analysis, laboratory tests and observation of the operation of a geothermal installation, a new method was developed to prevent the precipitation of sludge from cooled thermal water. The method being a modification of soft acidising was tentatively named as a super soft acidising method.
    Źródło:
    Chemical and Process Engineering; 2014, 35, 2; 205-216
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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