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    Wyświetlanie 1-7 z 7
    Tytuł:
    Ecology of rare water plant communities in lakes of north-eastern Poland
    Autorzy:
    Jablonska, E.
    Klosowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/57433.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    ecology
    rare species
    plant community
    lake
    Polska
    aquatic plant
    phytocoenosis
    water property
    substrate property
    comparative analysis
    Opis:
    Habitat studies were conducted on three rare plant communities dominated by Nuphar pumila, Nymphaea candida and Hydrilla verticillata in lakes of north-eastern Poland. The comparison of habitat properties of these three types of phytocoenoses with those of Nuphar lutea common in the area under study was also performed. It was demonstrated that the plant communities studied were ecologically distinct. The habitats of the phytocoenoses of N. pumila differed most significantly from those of the other phytocoenoses. They often inhabited softer waters poor in Mg2+, dissolved SiO2, but rich in total Fe, PO43−, NO3−, and were associated with acidic substrates containing lower levels of Ca2+ and Na+, but greater amounts of total Fe and NO3−. The differences in the habitats of H. verticillata and N. candida phytocoenoses were most pronounced in the case of four properties of water: Na+, K+, Cl−, and Mg+. Their values were lower in waters of the H. verticillata phytocoenoses. The habitats of all the three types of rare phytocoenoses differed considerably from those of N. lutea. The most significant differences were found between the N. lutea and N. pumila phytocoenoses and the smallest differences were between the patches of N. lutea and N. candida. The properties of water were more important in differentiating the habitats of the phytocoenoses studied than the substrate properties. Due to alkalization and increase in water hardness in the lakes studied the stands of N. pumila are among the most threatened. The patches of N. candida and H. verticillata, which occur in waters with a wider range of hardness and tolerating a slight increase in trophy, can still continue to persist in the lakes for a long time.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2012, 81, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution and habitat conditions of the phytocoenoses of Sphagnum denticulatum Bridel and Warnstorfia exannulata [B.,S. and G.] Loeske in Polish Lobelia lakes
    Autorzy:
    Szankowski, M
    Klosowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/58833.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    acidification
    phytocoenosis
    Warnstorfia exannulata
    Isoetes lacustris
    Sphagnum denticulatum
    distribution
    habitat condition
    lobelian lake
    Opis:
    Phytosociological and habitat studies of Sphagnum denticulatum and Warnstorfia exannulata phytocoenoses from Polish Lobelia lakes have been conducted. The present results were compared with data on Isoetes lacustris community. It is demonstrated that both communities of mosses are distinct with respect to their floristic composition. Moreover, they differ significantly from the patches of I. lacustris with regard to many properties of water and substrates. The phytocoenoses of S. denticulatum are associated with softer waters, poorer in Ca2+, Na+, NH4+ and dissolved organic matter, but richer in total Fe than those of I. lacustris. They are also distinguished by lower values of electrolytic conductivity. The substrates they inhabit are more strongly hydrated and richer in organic matter, total N, dissolved SiO2, Ca2+ and Na+, but poorer in PO43-. The W. exannulata phytocoenoses are also confined to softer waters with lower Ca2+, NH4+ and dissolved organic matter contents than those of I. lacustris. Their substrates are more strongly hydrated and have higher contents of organic matter, total N and Na+ but lower amounts of PO43-. In addition the waters of W. exannulata phytocoenoses are characterized by higher pH values and lower concentration of dissolved SiO2. The substrates are less acidic and richer in NO3-, but poorer in total Fe. The differences between the habitats of the S. denticulatum and W. exannulata phytocoenoses are also distinct. The former inhabit more acidic waters, richer in dissolved SiO2 and total Fe, but with lower values of electrolytic conductivity and concentration of Na+. Their substrates are distinguished by higher contents of organic matter and Ca2+, as well as by lower amount of NO3-. In view of the fact that the above phytocoenoses of mosses are distinct with respect to their floristic composition and are associated with specific habitats in which they form dense mats close to the bottom of the lake, they should be classified as distinct associations (Sphagnetum denticulati and Warnstorfietum exannulatae) in the system of aquatic communities (Class: Utricularietea intermedio-minoris).
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2004, 73, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Habitat differentiation of the Myriophyllum alterniflorum and Littorella uniflora phytocoenoses in Poland
    Autorzy:
    Klosowski, S
    Szankowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/56680.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    phytocoenosis
    Polska
    plant community
    Littorella uniflora
    Myriophyllum alterniflorum
    habitat differentiation
    Opis:
    The present study showed the ecological differentiation of phytocoenoses dominated either by Myriophyllum alterniflorum or by Littorella uniflora, which in Poland are classified within the Myriophylletum alterniflori or Myriophyllo-Littorelletum association. The properties which best differentiated the waters of the above types of phytocoenoses were calcium and factors associated with the carbonate complex (pH, electrolytic conductivity, total and carbonate hardness), and pH in the case of substrates. The most distinct differences in the habitats were found between the phytocoenoses dominated by L. uniflora from the Pomeranian Lobelia lakes and those dominated by M. alterniflorum from the Łęczna-Włodawa Lake District, in which other species from the Littorelletea uniflorae class were absent. The L. uniflora phytocoenoses are associated with soft waters poor in Ca2+ and with the lowest values of pH, electrolytic conductivity, dissolved organic matter (COD-KMnO4) and dissolved SiO2. The substrates they inhabit are mineral and more acidic. By contrast, the values of the above-mentioned properties are considerably higher in the case of the phytocoenoses from the Łęczna-Włodawa Lake District. The habitats of the M. alterniflorum phytocoenoses from the Pomeranian Lobelia lakes occupy an intermediate position and are more similar to those of M. alterniflorum from the Łęczna-Włodawa Lake District. The results obtained in this study suggest that the phytocoenoses of L. uniflora and M. alterniflorum should not be included in the same association. Further studies are, therefore, necessary to resolve this problem. The comparative analysis of the present ecological findings and data obtained from other regions of Europe show that in Poland the phytocoenoses dominated either by L. uniflora or by M. alterniflorum, in which the contribution of Littorelletea uniflorae species is appreciable, are clearly associated with soft waters and their habitats are representative of the Littorelletea uniflorae class. The massive development of the phytocoenoses with both L. uniflora and M. alterniflorum in the Lobelia lakes is not always indicative of the increase in water hardness and euthrophication of waters typical of the communities of the Littorelletea uniflorae class. The M. alterniflorum dominated phytocoenoses without other Littorelletea species could be good indicators of the above processes taking place in such water ecosystems.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2004, 73, 1
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aneuploids in the shrub birch Betula humilis populations in Poland
    Autorzy:
    Jadwiszczak, K.
    Jablonska, E.
    Klosowski, S.
    Banaszek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/58036.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    shrub birch
    Betula humilis
    plant population
    Polska
    aneuploidy
    karyology
    chromosome
    birch
    glacial relict
    Opis:
    Shrub birch (Betula humilis Schrk.) is endangered glacial relict growing in natural and drained fens and transitional mires. At present study we examined karyotypes of 103 individuals of B. humilis, collected in six populations from eastern and northeastern Poland. We found 60% of diploid individuals with 2n = 28. The rest of studied plants were aneuploids with 26, 27, 29, 30 and 31 chromosomes in their karyotypes. High frequencies of aneuploids in Polish populations of B. humilis could be a consequence of: (i) hybridization with congeneric species, (ii) stress resulting from range fragmentation, (iii) karyotype instability of individuals with 2n ≠ 28, or (iv) vegetative reproduction.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2011, 80, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New distributional data on bryophytes of poland and slovakia, 11
    Autorzy:
    Gorski, P.
    Staniaszek-Kik, M.
    Pawlikowski, P.
    Klosowski, S.
    Stefanska-Krzaczek, E.
    Domian, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/790631.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Opis:
    This work presents a list of localities for the following species: Anastrophyllum michauxii, Campylopus flexuosus, C. pyriformis, Diplophyllum obtusifolium, Fuscocephaloziopsis catenulata, Orthodicranum tauricum, Porella cordaeana and Ricciocarpos natans.
    Źródło:
    Steciana; 2017, 21, 3
    1689-653X
    Pojawia się w:
    Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability Analysis of Real-Time Simulation of a Power Transformer’s Operating Conditions
    Analiza stabilności symulacji stanów pracy transformatora elektroenergetycznego w czasie rzeczywistym
    Autorzy:
    Kłosowski, Z.
    Cieślik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/952909.pdf
    Data publikacji:
    2018
    Wydawca:
    ENERGA
    Tematy:
    symulator pracujący w czasie rzeczywistym
    stabilność symulacji
    model matematyczny transformatora
    real-time simulator
    simulation stability
    mathematical model of transformer
    Opis:
    Real-time computer simulation of a power system’s operating conditions requires the use of mathematical modelling algorithms that guarantee the execution of calculations in an assumed time and with an assumed precision. A power transformer is a power system’s basic element, the mathematical model of which is relatively complex (magnetic couplings, non-linear magnetization characteristics). Computer simulation of a transformer’s operating conditions is meant as a numerical representation of its operation. Simulation stability is another important issue in the context of the simulators’ operation in real time. This paper presents a stability analysis of real-time simulation using the numerical integration trapezoid algorithm for mathematical modelling of power transformers.
    Komputerowa symulacja stanów pracy systemów elektroenergetycznych w czasie rzeczywistym wymaga stosowania algorytmów modelowania matematycznego, które będą gwarantowały wykonanie obliczeń w założonym czasie i z określoną precyzją. Transformator elektroenergetyczny jest jednym z podstawowych elementów systemu elektroenergetycznego, którego model matematyczny jest stosunkowo złożony (m.in.: sprzężenia magnetyczne, nieliniowość charakterystyki magnesowania). Symulacja komputerowa stanów pracy transformatora jest rozumiana jako numeryczne odwzorowanie jego działania. Stabilność symulacji jest kolejnym ważnym zagadnieniem w kontekście pracy symulatorów w czasie rzeczywistym. W artykule przedstawiono analizę stabilności symulacji realizowanej w czasie rzeczywistym z zastosowaniem algorytmu trapezów całkowania numerycznego w modelowaniu matematycznym transformatorów elektroenergetycznych.
    Źródło:
    Acta Energetica; 2018, 2; 31-37
    2300-3022
    Pojawia się w:
    Acta Energetica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FPGA and ASIC implementation of the algorithm for traffic monitoring in urban areas
    Autorzy:
    Szczepański, S.
    Wójcikowski, M.
    Pankiewicz, B.
    Kłosowski, M.
    Żaglewski, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/202318.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    FPGA
    ASIC
    sensor network
    Opis:
    This paper describes the idea and the implementation of the image detection algorithm, that can be used in integrated sensor networks for environment and traffic monitoring in urban areas. The algorithm is dedicated to the extraction of moving vehicles from real-time camera images for the evaluation of traffic parameters, such as the number of vehicles, their direction of movement and their approximate speed. The authors, apart from the careful selection of particular steps of the algorithm towards hardware implementation, also proposed novel improvements, resulting in increasing the robustness and the efficiency. A single, stationary, monochrome camera is used, simple shadow and highlight elimination is performed. The occlusions are not taken into account, due to placing the camera at a location high above the road. The algorithm is designed and implemented in pipelined hardware, therefore high frame-rate efficiency has been achieved. The algorithm has been implemented and tested in FPGA and ASIC.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 2; 137-140
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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