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    Wyświetlanie 1-8 z 8
    Tytuł:
    Seasonal changes of carbohydrate content in Antarctic krill (Euphausia superba Dana)
    Autorzy:
    Kołakowski, Edward
    Szyper-Machowska, Lidia
    Powiązania:
    https://bibliotekanauki.pl/articles/2053142.pdf
    Data publikacji:
    1989
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctic krill
    carbohydrate fractions
    seasonal variations
    Źródło:
    Polish Polar Research; 1989, 10, 2; 133-139
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal changes in nitrogen fractions in the Antarctic krill (Euphausia superba Dana), Part 1. Basic nitrogen fractions
    Autorzy:
    Kołakowski, Edward
    Powiązania:
    https://bibliotekanauki.pl/articles/2053273.pdf
    Data publikacji:
    1987
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Antarctic krill
    chemical composition
    nitrogen fractions
    Źródło:
    Polish Polar Research; 1987, 8, 2; 159-165
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physico-Chemical Parameters Determining the Variability of Actually and Potentially Available Fractions of Heavy Metals in Fluvial Sediments of the Middle Odra River
    Autorzy:
    Ibragimow, A.
    Walna, B.
    Siepak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/204885.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heavy metals
    available fractions
    single extraction
    Odra River
    Opis:
    The occurrence of heavy metals (Cd, Cr, Cu, Ni, Pb, Zn) has been determined in the fluvial sediment samples collected along three transects in the Middle Odra River (western Poland) with a width of 360 m. The total concentrations of the metals were obtained after HNO3 microwave digestion and the available fractions of heavy metals were determined by single extraction procedures using two extractants: 0.01M CaCl2 and 0.05M EDTA. The measurement of physico-chemical parameters was also performed. The determination of total and available fractions of heavy metals, except potential available fractions of Cr, revealed high concentrations of studied elements detected in the sediment samples characterized by high content of coarse and very coarse-grained sand fraction and high content of organic matter. It was found that the concentrations of total and available fractions of metals could increase along with the content of organic matter, Eh values and concentrations of H+. Apart from the above, those concentrations become the lowest, the higher the content of medium grain size fractions is. Furthermore, the amounts of CaCl2 and EDTA extractable metals increase in the sediments samples characterized by the lowest total and available concentrations of heavy metals.
    Źródło:
    Archives of Environmental Protection; 2013, 39, 2; 3-16
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interactions of ostrich egg yolk lipoproteins with seminal plasma of fractionated ejaculates and their effects on post-thaw boar semen quality
    Autorzy:
    Fraser, L.
    Zasiadczyk, Ł.
    Strzeżek, J.
    Kordan, W.
    Mańkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087484.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    boar semen
    ejaculate fractions
    egg yolk lipoproteins
    cryopreservation
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 3; 463-473
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of synthesis methods in position optimisation and selection of tuned mass damper (TMD) parameters for systems with many degrees of freedom
    Autorzy:
    Dymarek, Andrzej
    Dzitowski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1409049.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    structural control system
    vibration
    simple fractions
    synthesis
    rational functions
    dynamic characteristics
    Opis:
    The paper formulates and formalises a method for selecting parameters of the tuned mass damper (TMD) for primary systems with many degrees of freedom. The method presented uses the properties of positive rational functions, in particular their decomposition, into simple fractions and continued fractions, which is used in the mixed method of synthesis of vibrating mechanical systems. In order to formulate a method of tuning a TMD, the paper discusses the basic properties of positive rational functions. The main assumptions of the mixed synthesis method is presented, based on which the general method of determining TMD parameters in the case of systems with many degrees of freedom was formulated. It has been shown that a tuned mass damper suppresses the desired resonance zone regardless of where the excitation force is applied. The advantages of the formulated method include the fact of reducing several forms of the object’s free vibration by attaching an additional system with the number of degrees of freedom corresponding to the number of resonant frequencies reduced. In addition, the tuned mass damper determined in the case of excitation force applied at a single point can be attached to any element of the inertial primary system without affecting the reduction conditions in this way. It results directly from the methodology formalised in the paper. As part of the paper, numerical calculations were performed regarding the tuning of the TMD to the first form of free vibration of a system with 3 degrees of freedom. The parameters determined were subjected to analysis and verification of the correctness of the calculations carried out. For the considered case of a system with 3 degrees of freedom together with a TMD, time responses of displacement, from each floor, were generated to excitation induced by a harmonic force equal to the first form of vibration of the basic system. In addition, in the case of the parameters obtained, the response of the inertial element system to which the TMD was attached to random white noise excitation was determined.
    Źródło:
    Archives of Control Sciences; 2021, 31, 1; 185-211
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Carbonaceous materials in petrochemical wastewater before and after treatment in an aerated submerged fixed-bed biofilm reactor
    Autorzy:
    Trojanowicz, K.
    Wojcik, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/185052.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Chemical Oxygen Demand fractions
    petrochemical wastewater
    biofilm reactor
    zapotrzebowanie tlenu
    petrochemiczne ścieki
    reaktor
    Opis:
    Results of the studies for determining fractions of organic contaminants in a pretreated petrochemical wastewater flowing into a pilot Aerated Submerged Fixed-Bed Biofilm Reactor (ASFBBR) are presented and discussed. The method of chemical oxygen demand (COD) fractionation consisted of physical tests and biological assays. It was found that the main part of the total COD in the petrochemical, pretreated wastewater was soluble organic substance with average value of 57.6%. The fractions of particulate and colloidal organic matter were found to be 31.8% and 10.6%, respectively. About 40% of COD in the influent was determined as readily biodegradable COD. The inert fraction of the soluble organic matter in the petrochemical wastewater constituted about 60% of the influent colloidal and soluble COD. Determination of degree of hydrolysis (DH) of the colloidal fraction of COD was also included in the paper. The estimated value of DH was about 62%. Values of the assayed COD fractions were compared with the same parameters obtained for municipal wastewater by other authors.
    Źródło:
    Chemical and Process Engineering; 2016, 37, 3; 373-382
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Content and mobility of strontium in forest soils according to north-south transect in Poland
    Zawartośc i mobilność strontu w glebach leśnych Polski w transekcie północ-południe
    Autorzy:
    Jeske, A.
    Gworek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/205400.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    strontium
    strontium fractions
    soil
    plants
    bioaccumulation
    stront
    frakcje strontu
    gleba leśna
    rośliny
    bioakumulacja
    Opis:
    The investigation was carried out on forest soils collected from areas subject to variable pollution. The fraction of strontium was analyzed in soil samples from north-eastern Poland (Borki forest division), treated as a non-polluted region (natural background) and in soil samples from central (Rogów forest division) and south-western Poland (Świerklaniec forest division). The sequential extraction procedure was applied in this study to separate the fractions of strontium. Five fractions were analyzed in every genetic horizon according to the Tessier method. The concentration of strontium was also analyzed in the plants. Both results were compared in order to evaluate the mobility and bioavailability of the trace elements in the environment. The content, distribution and bioavailability of the strontium fractions were investigated with particular emphasis on the contaminated study sites. Total content of strontium in surface horizons depended on the localization. Among analysed fractions strontium, in organic soil horizons, regardless of localization, occurred predominantly in mobile fractions in all examined soils.
    Obiektem badań były gleby i rośliny pochodzące z kompleksów leśnych zlokalizowanych na terenach o zróżnicowanej antropopresji. Dlatego też obiekty badań zlokalizowano na obszarach o wzrastającym gradiencie zanieczyszczeń począwszy od Polski północnej przez centralną do południowej (Górny Śląsk). Frakcje strontu oznaczano w próbkach gleb rdzawych i płowych. Frakcje strontu w glebach oznaczono metodą sekwencyjnej ekstrakcji według Tessier’a i in. Zawartość strontu oznaczono także w wybranych gatunkach roślin. Celem badań było zidentyfi kowanie form mobilnych strontu i określenie z jakimi składnikami gleby związany jest ten pierwiastek. Otrzymane wyniki wskazują na wyraźny wzrost całkowitej zawartości oraz form mobilnych strontu w poziomach powierzchniowych w zależności od lokalizacji. Ponadto stront w formach mobilnych dominował jedynie w poziomach organicznych badanych gleb.
    Źródło:
    Archives of Environmental Protection; 2013, 39, 4; 113-122
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coal Cleaning Versus the Reduction of Mercury and other Trace Elements’ Emissions from Coal Combustion Processes
    Autorzy:
    Zajusz-Zubek, E.
    Konieczyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/204840.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    heavy metals
    steam coals
    coal wet cleaning
    densimetric fractions
    mercury emission reduction
    metale ciężkie
    spalanie węgla
    proces czyszczenia węgla
    redukcja emisji rtęci
    Opis:
    Samples of steam coal used in heat and power plants as well as densimetric fractions obtained on a laboratory scale by dense organic liquid separation have been examined. The contents of ash, mercury, chromium, cadmium, copper, nickel and lead have been determined in coal, in the light and medium fraction as well as in the refuse. The degree of removal of mineral matter and the examined heavy metals as well as the coal combustible parts yield have been determined. Examination of 5 coals revealed that it is possible to remove 41% of mercury and more than 35% of other heavy metals bound to mineral matter in coal.
    Źródło:
    Archives of Environmental Protection; 2014, 40, 1; 115-127
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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