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    Wyświetlanie 1-4 z 4
    Tytuł:
    Benzene propagation during turbulent flow in PEHD water supply pipes
    Autorzy:
    Musz, A.
    Widomski, M. K.
    Kowalska, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/208125.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    water supply system
    turbulent flow
    PEHD pipes
    benzene
    polyethylene pipes
    laboratory study
    numerical study
    numerical model
    sieć wodociągowa
    przepływ turbulentny
    rury HDPE
    benzen
    rury polietylenowe
    badania laboratoryjne
    badania numeryczne
    model numeryczny
    Opis:
    The results of laboratory and numerical studies of benzene propagation migrating from PEHD pipe to water in turbulent flow conditions have been presented. Laboratory studies were performed on 30 meter long closed-loop installation consisting of PEHD 80 32×3.0 mm polyethylene pipes during the 168 h of experiment. Measurements of benzene concentration in water were conducted by the gas chromatography-mass spectroscopy (GC-MS) method. Numerical calculations of benzene propagation in water were performed with the Fluent, Ansys Inc. Our studies showed a clear increase of benzene concentration in water resulting from its migration to water from the pipe material. The developed numerical model was positively validated.
    Źródło:
    Environment Protection Engineering; 2015, 41, 4; 5-16
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field and Laboratory Studies of the Earthworm Dendrobaena Alpina
    Autorzy:
    Kostecka, J.
    Butt, K. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/124743.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    earthworms
    Dendrobaena alpina
    field study
    laboratory culture
    population dynamics
    Opis:
    Distribution of Dendrobaena alpina covers the mountainous region of central Europe, where it has a high dominance and frequency index. This work describes data from field studies conducted over two annual cycles in the Bieszczady National Park (BNP), Poland, in different types of beech forest. Densities of this species ranged from 47–231 g·m -2 with associated biomasses of 19–90 g·m -2. Most (66%) were recovered from less than 0.1 m soil depth with a further 28% from up to 0.2 m. Further, the animals were collected alive from Lutowiska, close to the BNP to obtain baseline data on the life history of D. alpina. Mature individuals were kept in isolation and cocoon production monitored on a 2 monthly basis. Immature individuals were kept until they reached maturity, when they were paired, with combined output of cocoons regularly monitored. Cocoons were collected, had their masses determined and were incubated. Hatchability was recorded, as was estimated duration of incubation and growth to maturity. Field-collected adults had a mean mass of 1.4 g and at 15 ºC, these produced an average of 1.83 cocoons·worm -1·month -1. Zero cocoons were produced by further specimens, collected as immature, grown to maturity and maintained in isolation. Recently-matured, paired D. alpina produced an average of 1.65 cocoons·worm -1·month -3. Cocoons had a mean mass of 19 mg. At 15 ºC, cocoons produced by recently matured adults hatched after 80 days (82% viable), but after 2 months the majority of cocoons failed to hatch. Hatchling growth from an average of 18 mg to maturity required 7–11 months in the given substrate.
    Źródło:
    Journal of Ecological Engineering; 2015, 16, 5; 213-217
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of annoyance due to wind turbine noise based on pre-learned patterns
    Autorzy:
    Felcyn, Jan
    Preis, Anna
    Gogol, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/24201941.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    survey
    in-situ study
    laboratory experiment
    calibration procedure
    ankieta
    badanie in situ
    eksperyment laboratoryjny
    procedura kalibracji
    Opis:
    Annoyance due to wind turbine noise is usually assessed on the basis of surveys conducted among people living in the vicinity of turbines or in the laboratory conditions. Due to the fact that the latter are very different from natural conditions, we propose a solution to reduce this difference. Prior to the surveys, 50 participants were asked to familiarize themselves with 5 environmental signals. They were informed about the annoyance rating assigned to each signal (obtained earlier in laboratory conditions), expressed as a number between 0 (not annoying signal) and 10 (extremely annoying signal). Participants were then presented with new environmental sounds and asked to rate the annoyance caused by each sound, in accordance with the previously learned method. The analysis of our results shows that the variability of answers given by respondents at their homes is similar to those obtained earlier in laboratory conditions.
    Źródło:
    Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022310
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of dynamic characteristics of selected pneumatic systems with rractional calculus. simulation and laboratory research
    Autorzy:
    Luft, M.
    Krzysztoszek, K.
    Pietruszczak, D.
    Nowocień, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2063992.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    pneumatic Systems
    vessel's dynamic characteristics
    dynamic characteristics
    fractional calculus
    Riemann-Liouville Definition
    laboratory research
    simulation study
    Matlab
    Opis:
    The section of the paper on simulation studies presents the application of fractional calculus to describe the dynamics of pneumatic systems. In the construction of mathematical models of the analysed dynamic systems, the Riemann-Liouville definition of differ-integral of non-integer order was used. For the analysed model, transfer function of integer and non-integer order was determined. Functions describing characteristics in time and frequency domains were determined, whereas the characteristics of the analysed systems were obtained by means of computer simulation. MATLAB were used for the simulation research. The section of the paper on laboratory research presents the results of the laboratory tests of the injection system of the internal combustion engine with special attention to the verification of simulated tests of selected pneumatic systems described with the use of fractional calculus.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 835--843
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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