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    Wyświetlanie 1-6 z 6
    Tytuł:
    Wzorce do badania penetracji materiałów filtracyjnych
    Standard filters for penetration tests of filtering materials
    Autorzy:
    Makowski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/179288.pdf
    Data publikacji:
    2008
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    wzorce filtracji
    ochrona układu oddechowego
    materiały filtracyjne
    badania
    standard filters
    filtering materials
    tests
    Opis:
    W artykule przedstawiono opracowane wzorce filtracji służące do oceny powtarzalności wskazań aparatury pomiarowej stosowanej do wyznaczania penetracji aerozoli testowych przez materiały filtracyjne stosowane w sprzęcie ochrony układu oddechowego. Wzorce mogą być stosowane do oceny rezultatów z użyciem zarówno aerozolu chlorku sodu, jak i mgły oleju parafinowego.
    This article presents developed standard filters that can be used for assessing the repeatability of tests stands for performing penetration tests of standard aerosols through filtering materials which are used in the manufacture of respiratory protective devices. Standard filters can be used for estimating test results obtained with the use of both sodium chloride and paraffin oil mist.
    Źródło:
    Bezpieczeństwo Pracy : nauka i praktyka; 2008, 4; 12-14
    0137-7043
    Pojawia się w:
    Bezpieczeństwo Pracy : nauka i praktyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of evolutionary algorithm to design minimal phase digital filters with non-standard amplitude characteristics and finite bit word length
    Autorzy:
    Słowik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/202324.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    artificial intelligence
    evolutionary algorithms
    digital filters
    minimal phase
    finite bits word length
    Opis:
    In this paper an application of evolutionary algorithm to design minimal phase digital filters with non-standard amplitude characteristics and with finite bit word length is presented. Four digital filters with infinite impulse response were designed using the proposed method. These digital filters possess: linearly falling characteristics, linearly growing characteristics, nonlinearly falling characteristics, and nonlinearly growing characteristics, and they are designed using bit words with an assumed length. This bit word length is connected with a processing register size. This register size depends on hardware possibilities where digital filter is to be implemented. In this paper, a modification of the mutation operator is introduced too. Due to this modification, better results were obtained in relation to the results obtained using the evolutionary algorithm with other mutation operators. The digital filters designed using the proposed method can be directly implemented in the hardware (DSP system) without any additional modifications.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 125-135
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fir Filters Compliant with the IEEE Standard for M Class PMU
    Autorzy:
    Duda, K.
    Zieliński, T. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221798.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phasor estimation
    Phasor Measurement Unit
    FIR filter
    cosine window
    flat-top window
    Opis:
    In this paper it is shown that M class PMU (Phasor Measurement Unit) reference model for phasor estimation recommended by the IEEE Standard C37.118.1 with the Amendment 1 is not compliant with the Standard. The reference filter preserves only the limits for TVE (total vector error), and exceeds FE (frequency error) and RFE (rate of frequency error) limits. As a remedy we propose new filters for phasor estimation for M class PMU that are fully compliant with the Standard requirements. The proposed filters are designed: 1) by the window method; 2) as flat-top windows; or as 3) optimal min-max filters. The results for all Standard compliance tests are presented, confirming good performance of the proposed filters. The proposed filters are fixed at the nominal frequency, i.e. frequency tracking and adaptive filter tuning are not required, therefore they are well suited for application in lowcost popular PMUs.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 4; 623-636
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Accredited Calibration Laboratory for Sound Measurements
    Autorzy:
    Podgórski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/114156.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    ISO / IEC 17025 standard
    accreditation of calibration laboratory
    calibration of sound level meter
    acoustic calibrator
    band-pass filters
    personal sound exposure meter
    Opis:
    The article presents basic concepts related to accredited calibration laboratories in accordance with ISO/IEC 17025. It describes in detail one of the only few existing in Poland calibration laboratories which deals with instruments for sound measurements. This laboratory is an interesting case as it is the only one in Poland, located in a company developing new instruments, producing, selling them and conducting their service in all over the world. Thanks to this location, the laboratory is able to provide their services not only in Poland but also abroad, which could affect revenues. In the paper laboratory equipment is presented and the innovative ways to increase measurement throughput is discussed. The calibration and measurement capability developed on the basis of uncertainty budgets is given. The activities carried out during the calibration are presented as well as the contents of the first page of the certificate. In the conclusions the strengths of the laboratory are listed.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 8; 250-253
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Particle filter test procedure and quality standard for diesel engines
    Autorzy:
    Mayer, A.
    Czerwinski, J.
    Kasper, M.
    Leutert, G.
    Heeb, N.
    Ulrich, A.
    Jaussi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/242255.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    combustion engines
    diesel engines
    particle filters
    quality air standards
    air pollution
    Opis:
    A new approach is needed to test particle filters for retrofitting Diesel engines. Considering the toxicity of the particles as also the physical and chemical attributes of particle filters, the optimal scheme is to test the components themselves independent of the deployment. That scheme ensures the highest effectiveness with least effort. It also enables evaluation of worst-case situations and assesses the hazards of secondary emissions. The Swiss standard SNR 277 205, which mandates the VERT test procedure, is a first step in that direction. Occupational health specialists have studied the toxicity of ultraflne particles for more than 100 years. Extremely toxic are the particles intruding into the lung. Larger particles, which are always naturally present, are intercepted in the upper respiratory paths. The body then expels these larger particles rapidly via the mucus and cilia. The new manmade particles less-than l mi m, however massively intrude into the fine pulmonary alveoli, which do not have the cleansing mechanism. The targeted efficiencies for evaluating modern filters are evident from the progress achieved. Many filters have filtration rates exceeding 99.9%, albeit the directives [4] only require 97%.
    Źródło:
    Journal of KONES; 2009, 16, 2; 305-314
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vert particle filter test procedure and quality standard for new and in-use diesel engines
    Autorzy:
    Mayer, A.
    Czerwinski, J.
    Kasper, M.
    Leutert, G.
    Heeb, N. V.
    Ulrich, A.
    Jaussi, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/247808.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    internal combustion engines
    diesel engines
    ecology
    filters
    particulates
    Opis:
    A new approach is needed to test particle filters for retrofitting Diesel engines. Considering the toxicity of the particles as also the physical and chemical attributes of particle filters, the optimal scheme is to test the components themselves independent of the deployment. That scheme ensures the highest effectiveness with least effort. It also enables evaluation of worst-case situations and assesses the hazards of secondary emissions. The Swiss standard SNR 277 205, which mandates the VERT test procedure, is a first step in that direction. The solution is derived from the physics of the filter media. The filtration of fine particles essentially depends on the particle size and the space velocity. The attributes of the emitting engine are only insignificantly relevant. Hence the physics and chemistry of particle filters can be investigated independent of the engine and its deployment duty. This concept facilitates a very thorough investigation of the size-dependent filtration, aging susceptibility, secondary emissions and extreme situations. Filter systems, which pass this detailed test, perform equally well in every retrofit configuration. This filter test concept was implemented 1998 in the VERT project and is successful for assessing retrofltting [4]. VERT approved fllter systems are already deployed in the Low Emission Zones of Europe, North and South America.
    Źródło:
    Journal of KONES; 2010, 17, 4; 313-322
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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