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    Wyświetlanie 1-4 z 4
    Tytuł:
    Use of trees for reducing particulate matter pollution in air
    Autorzy:
    Dzierżanowski, K.
    Gawroński, S. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/115807.pdf
    Data publikacji:
    2011
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    air contamination
    PM
    phytoremediation
    coarse particles
    urban forest
    Opis:
    Adverse health effects of environmental pollution is a frequent subject of medical and veterinary studies. One of the most dangerous air contaminants is particulate matter (PM). Planting trees as biological filters is considered as a valuable way of reducing number of particles in air. However, there is not enough research on selecting the most efficient plant species/varieties for accumulation of these pollutants. In this study, five commonly cultivated tree species were compared: silver birch, Simon’s poplar, callery pear ‘Chanticleer’, northern red oak and Swedish whitebeam, to identify the differences in accumulation levels of PM on leaf surface. Results showed that all of the tested species accumulated high amounts of PM. Whitebeam and birch were most effective in capturing particles, while lowest levels were found on oak.
    Źródło:
    Challenges of Modern Technology; 2011, 2, 1; 69-73
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the selection of the coarsest size class in flotation rate characterizations
    Autorzy:
    Orellana, Francisca
    Rivera, Marcelo
    Benítez, Matías
    Belmonte, Karyn
    Vinnett, Luis
    Powiązania:
    https://bibliotekanauki.pl/articles/24603662.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation kinetics
    froth flotation
    coarse particles
    flotation rate distribution
    Opis:
    This paper studies size-by-size batch flotation kinetics for the separation of Cu at particle sizes +75 μm, investigating the responses in the -150/+75 μm, -212/+150 μm, -300/+212 μm, -355/+300 μm and +355 μm size fractions. The kinetic results were analyzed to identify classes limited by the maximum achievable recovery or low flotation rates. Combinations of these classes were investigated, emulating the selection of the coarsest size in a kinetic study. The impact of compositing size classes was discussed, emphasizing implications in the identification of difficult-to-float components. The -212/+75 μm classes reached steady recoveries at long flotation times, whereas the -355/+212 μm classes presented sustained increasing recoveries at extended flotation times. Flotation rate distributions in the -212/+75 μm classes exhibited mound-shaped distributions, indicating low fractions of rate constants close to zero (R∞-limited case). Conversely, the -355/+212 μm classes presented reverse J-shaped distributions, with a high fraction of valuable minerals with flotation rates close to zero (rate-limited case). Combining several size classes in the definition of the coarsest size fraction in kinetic characterizations proved to hide the flotation patterns of the less massive constituents (+212 μm classes). The +75 μm and +150 μm cumulative retained classes trended towards steady recoveries, consistently leading to mounded flotation rate distributions. This study highlighted the need for reliable methodologies to select size fractions in kinetic characterizations, as their arbitrary definitions may lead to a misinterpretation of the mineral losses when compositing classes with different flotation responses.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 5; art. no. 176950
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of effective parameters on generating submicron (nano)-bubbles using the hydrodynamic cavitation
    Autorzy:
    Nazari, Sabereh
    Shafaei, Sied Ziaedin
    Hassanzadeh, Ahmad
    Azizi, Asghar
    Gharabaghi, Mahdi
    Ahmadi, Rahman
    Shahbazi, Behzad
    Powiązania:
    https://bibliotekanauki.pl/articles/1845212.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    coarse quartz particles
    bulk nanobubbles (NBs)
    fractional factorial design
    frother type
    temperature
    Opis:
    Although submicron (nano)-bubbles (NBs) have been broadly used in the laboratory flotation processes, the role of critical factors in their generation is not adequately explored in the literature. The present study investigates the effect of six key factors on generating submicron-sized bubbles and its application to coarse-sized quartz flotation. Interaction of influential factors is highlighted, which was generally overlooked in previous studies. These parameters i.e. frother type (MIBC and A65), frother dosage (50-130 mg/L), air flow rate (0.1-0.4 L/min), pressure in Venturi tube (250-400 kPa), liquid temperature (22-42 °C) and pH (6-10) were evaluated through software based statistical fractional factorial design. The size distribution of NBs produced by the principle of hydrodynamic cavitation was measured using a laser particle size analyzer (LPSA), and Sauter mean bubble diameter (d32) was considered as the response of experimental design. Batch flotation experiments were performed with and without the A65 and MIBC-NBs. The results of experimental design showed that relative intensity of the main factors followed the order of air flow rate>temperature>frother type as the most effective parameters on the bubble size. It was revealed that the lowest air flow rate (0.1 L/min) produced the smallest bubbles. Meanwhile, the d32 decreased as the liquid temperature increased, and the bubble size strongly was related to the frother type and its concentration. Indeed, with changing frother from MIBC to A65, the reduction in mean bubble size was two-fold. Interaction of frother type with its dosage, air flow rate and pressure were statistically recognized significant on the mean bubble size, which was confirmed by p-values. Finally, flotation recovery of quartz particles improved ca. 22% in the presence of NBs compared to the conventional flotation.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 5; 884-904
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badanie krzywych płynięcia sosów na bazie przecieru pomidorowego z dodatkiem wybranych cząstek o zróżnicowanej geometrii
    Flow characteristics of tomato puree with the addition of large particles of various geometries
    Autorzy:
    Probola, G.
    Warechowski, J.
    Haponiuk, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2073352.pdf
    Data publikacji:
    2018
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    lepkość
    duże cząstki
    konsystometr Bostwicka
    przystawka zanurzeniowa
    mieszadło vane
    viscosity
    coarse particles
    Bostwick consistometer
    bali measuring system
    vane impeller
    Opis:
    Celem niniejszej pracy było sporządzenie charakterystyk płynięcia modelowych układów zawiesin spożywczych zawierających dodatek dużych cząstek stałych o różnym składzie i geometrii. Wykonano pomiary konsystencji na konsystometrach Bostwicka i rynnowym oraz pomiary właściwości Teologicznych na reometrach z przystawką zanurzeniową i z mieszadłem skrzydełkowym. Stwierdzono, że większą lepkość pozorną miał przecier pomidorowy z ryżem niż przeciery z makiem i sezamem, zaś w przypadku makaronów najmniejszy przyrost lepkości przecieru powodował dodatek najkrótszych, 5-milimetrowych kawałków makaronu.
    The purpose of this work was to characterize the flow characteristics of model food suspension systems containing the addition of large solid particles, differing in composition and geometry. The consistency measurements were carried out using Bostwick and gutter consistometers, as well as measurements with the bali measuring system and vane impeller. It was found that tomato paste with rice particles showed greater apparent viscosity than puree with poppy seeds and sesame, and in the case of pasta the smallest increase of puree viscosity resulted in the addition of the shortest threads.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2018, 4; 114--115
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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