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    Wyświetlanie 1-4 z 4
    Tytuł:
    Spanning Trees of the World Trade Web: Real-World Data and the Gravity Model of Trade
    Autorzy:
    Skowron, P.
    Karpiarz, M.
    Fronczak, A.
    Fronczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1388204.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    89.75.-k
    89.65.Gh
    89.65.-s
    Opis:
    In this paper, we investigate the statistical features of the weighted international-trade network. By finding the maximum weight spanning trees for this network we make the extraction of the truly relevant connections forming the network's backbone. We discuss the role of large-sized countries (strongest economies) in the tree. Finally, we compare the topological properties of this backbone to the maximum weight spanning trees obtained from the gravity model of trade. We show that the model correctly reproduces the backbone of the real-world economy.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3A; A-123-A-128
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal Variability of Physicochemical Parameters of Water Quality on Length of Uszwica River
    Autorzy:
    Bogdał, A.
    Kowalik, T.
    Ostrowski, K.
    Skowron, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/124285.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    ecological potential
    water pollution
    physicochemical indices
    eutrophication
    Opis:
    The Uszwica river catchment is located in the central part of Lesser Poland province, within Brzeski and Bocheński districts. The river is 61.2 km long, and its catchment area is 322.5 km2. It is characterized by forest-agricultural land use and high share of residential areas of both compact (the city of Brzesko) and dispersed nature. In the abiotic terms, the Uszwica in its upper course may be classified as a flysch stream (type 12). From the moment of joining the Niedźwiedź, stream until its discharge into the Vistula at km 151+700 it is a sand and clay lowland river (type 19). Hydrochemical research were conducted in the years 2011 and 2012 at two measurement-control points – one located near the mouth of the river (point 1) and one located about 7.5 km downstream from the city of Brzesko (point 2). Each month 18 water quality parameters were determined and they underwent comparative and statistical analyses. Basic descriptive statistics were calculated for both measurement-control points. Then, they were used to determine the ecological potential of the river and to evaluate water quality parameters with respect to its suitability as fish habitat and eutrophication risk. Significance of differences between the values of individual parameters recorded at different measurement-control points was estimated using non-parametric Mann-Whitney U test for α = 0.05. The same test was used to determine the significance of differences between individual parameters for the winter and summer season at each point. Analysis of the results revealed that water flowing via developed areas (point 2) was significantly less saturated with oxygen and contained higher amounts of suspended solids, organic matter and nutrients, as compared to the section of the river flowing mainly through extensively used agricultural areas. Therefore, the ecological potential of the river was considered good in its lower course and poor upstream from point 2. Disturbances in seasonal concentrations of some biogenic factors indicated high degree of water pollution in the middle course of the Uszwica. However, due to intense self-purification, water quality in the lower course was similar to that in natural conditions. On the entire investigated section of the Uszwica does not meet water quality requirements for salmonids and cyprinids, but the habitats are more favorable near the mouth of the river. Waterassessed at point 2 may be classified as eutrophic due to high concentration of total phosphorus.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 1; 161-170
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental and Practical Aspects of the use of Peat for Agriculture and Energy Aims
    Autorzy:
    Kowalczyk-Juśko, A.
    Onuch, J.
    Kościk, B.
    Skowron, P.
    Chołody, M.
    Kosidło, A.
    Rawski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/124083.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    peat
    physical properties
    energy value
    power generation
    improving soil quality
    Opis:
    The aim of this study was to evaluate physical and energetic parameters of peat. Utility of the peat in horticulture and power generation were also estimated. Peat was mined from the Klejniki deposit, (Hajnówka municipality, Podlaskie province) in the north-eastern part of Poland. It was found that peat can be used for power generation, in the air-dry moisture condition. Peat parameters are similar to lignite. It can also be suitable for the production of horticultural substrates and incorporated into soil as a component for improving physical and chemical properties. The examined peat fulfills the requirements of for agricultural applications.
    Źródło:
    Journal of Ecological Engineering; 2016, 17, 4; 138-142
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of the effectiveness of various parasitological methods in detecting nematode eggs in different types of soil
    Autorzy:
    Zdybel, J.M.
    Sroka, J.
    Karamon, J.
    Bilska-Zając, E.
    Wójcik-Fatla, A.
    Kłapeć, T.
    Skowron, P.
    Siebielec, G.
    Jadczyszyn, T.
    Cencek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/28763034.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2023, 30, 3; 425-431
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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