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    Wyświetlanie 1-10 z 10
    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:
    Digital-Filter-Based Compensation of Case Effect in Sound-Level Meters
    Autorzy:
    Miękina, A.
    Podgórski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/226786.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    digital compensation
    DSP applications
    FIR filter design
    Remez algorithm
    Opis:
    The methodology for the design of a digital filter, which should compensate the effect of reflections and diffraction from the sound-level meter's casing (the so-called case effect), is presented. The coefficients of the family of the finite impulse response (FIR) filters, which were selected to fulfill the requirements of the compensation, were obtained in the MATLAB environment using the Remez algorithm. The frequency response of the selected designed filter are given. The chosen FIR filter was implemented in an on-chip Enhanced Filter Coprocessor of a fixed point 24-bit digital signal processor of a sound-level meter.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 3; 263-266
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the Pulmonary Toxicity of Inhaled Gases and Particles With Physicochemical Methods
    Autorzy:
    Sosnowski, T. R.
    Podgórski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/90050.pdf
    Data publikacji:
    1999
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    pulmonary surfactant
    surface activity
    pulsating bubble technique
    langmuir balance
    hysteresis
    histereza
    toksyczność
    wdychanie
    Opis:
    Physicochemical techniques used for evaluating the pulmonary surfactant (PS) quality are discussed as methods useful in assessing toxicity of inhaled gases and particles. Two standard devices, Langmuir-Wilhelmy film balance and pulsating bubble apparatus, are presented in detail, and the measured results of interaction between sulfuric acid and 2 models of PS material are analyzed. The evident decrease in surface activity of the pulmonary surfactant after its contact with the acid at concentrations approaching 0.001 M may be considered as an indicator of the adverse effect, which can result in several health problems. The presented approach can be used as a method of assessing pulmonary toxicity of any substances present in the breathing air.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 1999, 5, 3; 431-447
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of aerosol dispersion in fibrous filters
    Autorzy:
    Jackiewicz, A.
    Bałazy, A.
    Podgórski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/778265.pdf
    Data publikacji:
    2008
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    aerozol
    dyspersja aerozolu
    filtr włókninowy
    filtracja
    aerosol dispersion
    fibrous filters
    filtration
    Opis:
    Fractional penetration through four fibrous filters was determined experimentally at various air velocities. To describe the data obtained for multilayer sets of filters composed of up to nine layers of the same filter, the axial dispersion model was applied. This model predicts a non-exponential decrease of aerosol penetration with a filter thickness increase. The dispersion model contains two parameters, λ and Dx, which were evaluated on the basis of the experimental data. For the first time ever the axial dispersion coefficients, Dx, in fibrous filters were determined.
    Źródło:
    Polish Journal of Chemical Technology; 2008, 10, 1; 66-72
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deposition and Retention of Ultrafine Aerosol Particles in the Human Respiratory System. Normal and Pathological Cases
    Autorzy:
    Gradoń, L.
    Orlicki, D.
    Podgórski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/89980.pdf
    Data publikacji:
    2000
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    nanoparticles
    clearance
    deposition
    retention
    toxicity
    nanocząstki
    retencja
    toksyczność
    Opis:
    The particle number concentration in ambient air is dominated by nanometersized particles. Recent epidemiological studies report an association between the presence of nanoparticles in inhaled air at the workplace and acute morbidity and even mortality in the elderly. A theoretical model of deposition of 20 nm particles in the human alveolus was formulated. Gas flow structure and deposition rate were calculated for alveoli with different elastic properties of lung tissue. Data obtained in the paper show increased convective effects and diffusional rate of deposition of nanoparticles tor alveoli with higher stiffness of the alveolar wall. The retention of deposited particles is also higher in these pathological alveoli. Results of our calculations indicate a possibility of existence of a positive loop of coupling in deposition and retention of nanoparticles in the lung with pathological changes.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2000, 6, 2; 189-207
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of computer generated holograms using hot embossing nano imprint lithography
    Technologia wytwarzania replik hologramów syntetycznych w procesach tłoczenia na gorąco
    Autorzy:
    Rojek, A.
    Kowalik, A.
    Podgórski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/192198.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych
    Tematy:
    hot embossing nano imprint lithography
    nanoimprint
    computer generated holograms
    tłoczenie na gorąco
    hologramy syntetyczne
    Opis:
    The article presents the investigation to develop a technology for fabricating micro-and nanostructures of a high dimensional precision using the processes of Hot Embossing Nano Imprint Lithography. The research was carried out for three thermoplastic polymers, i.e. poly(methyl methacrylate), olefin copolymer and polycarbonate in order. The process parameters and pattern correction coefficients for shrinkage compensation have been determined. The accuracy better than 1.25 x 10-3 % has been reached for the pattern replicated onto olefin copolymer substrates.
    W artykule przedstawiono technologię wytwarzania kopii (replik) mikro- i nanostruktur o dużej precyzji wymiarowej w procesach tłoczenia na gorąco (Hot Embossing Nano Imprint Lithography). Badania prowadzono dla trzech polimerów termoplastycznych - polimetakrylanu metylu, kopolimeru olefinowego oraz poliwęglanu. określono warunki procesów i współczynniki korekty wzorów kompensujące skurcz towarzyszący kopiowaniu struktur. Uzyskano repliki, dla których względny błąd wymiarów poprzecznych wynosił poniżej 1.25 x 10-3 %.
    Źródło:
    Materiały Elektroniczne; 2018, T.46, nr 1-4, 1-4; 3-7
    0209-0058
    Pojawia się w:
    Materiały Elektroniczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The fractal characteristics of lattice media. Part I.
    Autorzy:
    Marciniak, A.
    Fijolek, A.
    Kwiecien, S.
    Podgorski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/26351.pdf
    Data publikacji:
    1996
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    lattice medium
    physical property
    topological dimension
    geometrical property
    probability dimension
    Źródło:
    International Agrophysics; 1996, 10, 4
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chaotic behavior of infinitely divisible processes
    Autorzy:
    Cambanis, S.
    Podgórski, K.
    Weron, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1289000.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    infinitely divisible process
    ergodicity and mixing
    stationary process
    stochastic representation
    Musielak-Orlicz space
    hierarchy of chaos
    Opis:
    The hierarchy of chaotic properties of symmetric infinitely divisible stationary processes is studied in the language of their stochastic representation. The structure of the Musielak-Orlicz space in this representation is exploited here.
    Źródło:
    Studia Mathematica; 1995, 115, 2; 109-127
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determinants of occupational burnout among employees of the Emergency Medical Services in Poland
    Autorzy:
    Leszczyński, P.
    Panczyk, M.
    Podgórski, M.
    Owczarek, K.
    Gałązkowski, R.
    Mikos, M.
    Charuta, A.
    Zacharuk, T.
    Gotlib, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082970.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    workload
    State Medical Emergency Services
    psychometric test
    attitude to work
    attitude to stress
    occupational (job)
    burnout
    contact with the patient
    Opis:
    Introduction. Occupational burnout is a multifaceted phenomenon and a problem often encountered among medical personnel. An example of such a group are workers of the Emergency Medical Services (EMS). The aim of the present study was to make an attempt to assess the level of job burnout among professionally active employees of the EMS and to compare the different occupational groups (paramedics, nurses of the system, doctors of the system) according to four analyzed factors. Materials and methods. A cross-sectional study was performed using an on-line questionnaire. Four factors impacting the level of burnout were analyzed: 1) attitude to work; 2) workload; 3) contact with the patient; 4) attitude to stress). The minimum possible result on the scale is 36 points and the maximum – 252. Data were analysed by means of the Cronbach’s alpha coefficient, the Spearman correlation, the Ramsey RESET test, the Chow test, VIF statistics. Results. The average score for occupational burnout was 131.0 points (SD ± 31.47). The tool’s reliability measured by means of Cronbach’s alpha was 0.910). Both nurses and doctors obtained higher results throughout the scale (βstand. 0.147 and 0.215). Significant differences were shown between the group working only in the Helicopter Emergency Medical Service (HEMS) teams and the other services (land EMS, emergency rooms, etc.) at the level of p < 0.000. Conclusions. EMS employees encounter varying degrees of threat by occupational burnout. Doctors working in the system are shown to have the highest level of burnout, while paramedics the lowest. Among all the jobs analyzed, the lowest level of occupational burnout has been demonstrated by employees of HEMS.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2019, 26, 1; 114-119
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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