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    Wyświetlanie 1-7 z 7
    Tytuł:
    Modelowanie i symulacja w naukach ekonomicznych
    Modelling and simulation in the ecomomic sciences
    Autorzy:
    Ohirko, I.
    Zaniewski, I.
    Ogirko, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/314487.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    ekonomia matematyczna
    modelowanie matematyczne
    symulacja matematyczna
    mathematical economics
    mathematical modeling
    mathematical simulation
    Opis:
    Celem pracy było określenie roli i miejsca modelowanie i symulacji w naukach ekonomicznych. Matematyczna gospodarka to jest zestaw metod matematycznych, pozwalających przedstawić teorie i przeanalizować problemy w gospodarce. To zaprzecza, że matematyka nie pozwala ekonomii sformować znaczące, testowane propozycje. Mowa matematyki pozwala ekonomistom konkretyzować, pozytywne wymogi o spornych czy dokładnych tematach, które były by niemożliwe bez matematyki. Dużo co teorii z ekonomicznej jest teraz obecne w terminach matematycznych modeli ekonomicznych.
    The aim of the research was to define a role and a place of modelling and simulation in the economic sciences. Mathematical economics is the application of mathematical methods to represent theories and analyze problems in economics. It is argued that mathematics allows economists to form meaningful, testable propositions about wide-ranging and complex subjects which could less easily be expressed informally. The language of mathematics allows economists to make specific, positive claims about controversial or contentious subjects that would be impossible without mathematics. Much of economic theory is currently presented in terms of mathematical economic models, a set of stylized and simplified mathematical relationships asserted to clarify assumptions and implications.The aim of the research was to define a role and a place of modelling and simulation in the economic sciences. Mathematical economics is the application of mathematical methods to represent theories and analyze problems in economics. It is argued that mathematics allows economists to form meaningful, testable propositions about wide-ranging and complex subjects which could less easily be expressed informally. The language of mathematics allows economists to make specific, positive claims about controversial or contentious subjects that would be impossible without mathematics. Much of economic theory is currently presented in terms of mathematical economic models, a set of stylized and simplified mathematical relationships asserted to clarify assumptions and implications.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 6; 1742-1747
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    "Puszcza Slupecka" Nature Reserve near Warsaw as an example of a young forest abundant in ancient-forest species
    Autorzy:
    Dembicz, I.
    Zaniewski, P.
    Kozub, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/878438.pdf
    Data publikacji:
    2012
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Źródło:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2012, 16
    1896-1908
    Pojawia się w:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Current state, habitat and potential invasiveness of Montia linearis (Douglas ex Hook.) Greene in Poland
    Autorzy:
    Dembicz, I.
    Kozub, L.
    Zaniewski, P.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/59192.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    present state
    habitat
    biological invasion
    Montia linearis
    narrowleaf miner's lettuce
    weed dispersal
    intensive agriculture
    cattle
    animal breeding
    meadow
    non-native species
    Polska
    Opis:
    Montia linearis is a vascular plant originating from western North America. The expansion of this species has been observed for several decades. For the first time M. linearis was found in Europe in 1989. Further six populations were documented by 2004 within the continent: three in Poland, two in Denmark and one in Hungary. Apart from discovering a new population of M. linearis, we confirmed two out of the three previously known localities of the species in Poland. All the currently known populations of M. linearis occupied predominantly meadow habitats, especially intensively managed sites. Some individuals were also found in disturbed sites with bare soil. The studied species inhabited soils of various types with broad range of fertility as well as humidity. Montia linearis populations reached densities up to 87 individuals per 0.04 m2. The number of seeds produced by an individual was between 10 and 55 in 90% of the studied specimens, however much more fertile specimens were also observed. As the previously presented hypothesis of M. linearis dispersal with rail transport seemed not to be well supported, the connection between the M. linearis presence and cattle husbandry is considered. It is possible that the species can be transferred with living animals or manure. The species was able to survive for at least 26 years within once inhabited site. Further spread of M. linearis within Europe is highly probable. The aim of the study is to: (i) describe the current state of populations of M. linearis in Poland, (ii) provide information on habitat preferences and biology of the species, (iii) assess the invasiveness potential of M. linearis in Poland.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2015, 84, 3
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rezerwat przyrody Puszcza Słupecka jako przykład młodego lasu o wysokim bogactwie gatunkowym porostów
    Puszcza Slupecka Nature Reserve as an example of young forest abundant in lichen species
    Autorzy:
    Zaniewski, P.T.
    Topolska, K.
    Kozub, L.
    Dembicz, I.
    Wierzbicka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/882717.pdf
    Data publikacji:
    2015
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
    Tematy:
    rezerwaty przyrody
    rezerwat Puszcza Slupecka
    porosty
    grzyby naporostowe
    bogactwo gatunkowe
    gatunki wskaznikowe lasow puszczanskich
    Calicium adspersum
    Chaenotheca stemonea
    Chrysotrix candelaris
    wystepowanie
    Źródło:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2015, 17, 3[44]
    1509-1414
    Pojawia się w:
    Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synantropizacja flory roślin naczyniowych rezerwatu Wieliszewskie Łęgi (środkowa Polska)
    Synanthropization of vascular plant flora in the Wieliszewskie Legi Nature Reserve (central Poland)
    Autorzy:
    Zaniewski, P.T.
    Dembicz, I.
    Zaniewska, E.
    Kanabus, A.
    Kozub, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2136714.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    rezerwaty przyrody
    rezerwat Wieliszewskie Legi
    flora
    rosliny naczyniowe
    sklad gatunkowy
    synantropizacja
    wskaznik synantropizacji
    apophytization
    kenophytization
    anthropophytization
    disturbance
    embankments
    transformation into oak-hornbeam
    forest
    transformation into alder carr
    Mazovia
    Opis:
    Understanding human influence on vegetation dynamics is important from both conservation and human management perspectives. The Wieliszewskie Łęgi Reserve, located in central Poland, is a young forest area that was cut off from the flood waters of the Narew river in 1963, but since then has been constantly and intensively supplied with water from overflows under the dike. On the southern side, adjacent to the reserve, there are patches of valuable meadows, rushes and scrub communities. The aim of this study was to determine the degree of synanthropization of the flora in the Wieliszewskie Łęgi reserve and to assess changes occurring in its vegetation. The vascular plant flora of the reserve and its southern vicinity was surveyed in 2017 and the plant communities within the study area were mapped. In the area of the reserve, we observed a total of 264 vascular plant species, whereas for the entire area under study, 314 spe- cies were recorded. Of these, 14 were classified as valuable. The high species richness was mainly due to the presence of a large number of apophytes – native species quickly colonizing sites transformed by man. Therefore the degree of naturalness of the reserve's flora was relatively low, which is most likely due to the lack of refugia for typical forest species. A number of plant communities of non-forest, scrub and forest character, typical for swampy, wet, semixeric as well as dry habitats were recorded. Succession, manifested by the disappearance of non-forest and scrub communities and progression of forest communities, is superimposed on the processes of transformation into semixeric oak-hornbeam communities in the highest areas and carr com- munities in the lowest areas. A low proportion of kenophytes (16 species) and a zero value of the index of fluctuation changes indicate a relative resistance of the reserve to invasion by alien species.
    Źródło:
    Leśne Prace Badawcze; 2021, 82, 2; 47-66
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vascular plants of the Maly Borek Nature Reserve in the Augustow Forest (NE Poland)
    Autorzy:
    Pawlikowski, P.
    Wolkowycki, D.
    Zaniewski, P.
    Dembicz, I.
    Torzewski, K.
    Zarzecki, R.
    Cakala, A.
    Kotowska, K.
    Galus, M.
    Topolska, K.
    Kozub, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/878343.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Tematy:
    vascular plant
    nature reserve
    red list
    species list
    coniferous forest
    indicator species
    ancient forest plant species
    Maly Borek Nature Reserve
    Augustow Forest
    Polska
    Opis:
    During the survey of the Mały Borek nature reserve (Augustów Forest, NE Poland) 236 species of vascular plants were recorded, including 10 plant species red-listed in Poland and 19 species protected under the Polish law. The most valuable species were sedges typical of the boreal coniferous forests: Carex vaginata, C. globularis and C. loliacea. The presence of neophytes was very limited (1,3% of the flora) in the area studied. The principal aim of the establishment of the reserve was the conservation of old-growth coniferous forests with long ecological continuity. Since the reserve studied consists mainly of old-growth coniferous forests, the number of species regarded as ancient forest indicators is lower (54 species) than in the well-preserved reserves with deciduous stands in north-east Poland, but still rather high. The most valuable, threatened species are bound to wetland forests that are presently disturbed due to drainage. Restoration of the former hydrological conditions is essential for the preservation of the vascular plants in the reserve.
    Źródło:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2013, 17
    1896-1908
    Pojawia się w:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rare and threatened plants of the mires in the intensively managed landscape of the Gory Sudawskie region (north-eastern Poland)
    Autorzy:
    Pawlikowski, P.
    Jarzombkowski, F.
    Wolkowycki, D.
    Kozub, L.
    Zaniewski, P.
    Bakanowska, O.
    Banasiak, L.
    Baranska, K.
    Bielska, A.
    Biereznoj, U.
    Galus, M.
    Grzybowska, M.
    Kapler, A.
    Karpowicz, J.
    Sadowska, I.
    Zarzecki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/878566.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Przyrodniczy w Poznaniu
    Źródło:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana; 2009, 13
    1896-1908
    Pojawia się w:
    Roczniki Akademii Rolniczej w Poznaniu. Botanika-Steciana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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