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    Wyświetlanie 1-7 z 7
    Tytuł:
    Specyfika leśnictwa regionów Ukrainy
    The specificity of forestry in different regions of the Ukraine
    Autorzy:
    Boiko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/45322.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    lesnictwo
    Ukraina
    Polesie
    lasostep
    step
    Polwysep Krymski
    Karpaty
    gospodarka lesna
    lasy
    ciecia pielegnacyjne
    ciecia rebne
    odnowienia lasu
    Źródło:
    Leśne Prace Badawcze; 2012, 73, 1
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ skały macierzystej na produkcyjność lasów dębowych lasostepu lewobrzeżnej Ukrainy
    The influence of parent material on the productivity of oak forests in the forest-steppe zone of Left-Bank Ukraine
    Autorzy:
    Raspopina, S.
    Neyko, I.
    Boiko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/46314.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    Ukraina
    lasostep
    drzewostany debowe
    produkcyjnosc drzewostanow
    czynniki siedliska
    skaly macierzyste
    sklad granulometryczny
    gleby
    sklad chemiczny
    Źródło:
    Leśne Prace Badawcze; 2011, 72, 2
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Określanie lesistości Polesia Ukraińskiego na podstawie wyników klasyfikacji sezonowych obrazów kompozytowych Landsat 8 OLI
    Estimation of forest cover in Ukrainian Polissia using classification of seasonal composite Landsat 8 OLI images
    Autorzy:
    Lakyda, P.
    Myroniuk, V.
    Bilous, A.
    Boiko, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/979663.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    Ukraina
    Polesie
    lesistosc
    teledetekcja
    zdjecia satelitarne
    satelita Landsat 8 OLI
    forest cover
    remote sensing
    random forest
    ikonos−2
    ndvi
    Opis:
    Training dataset for modelling of forest cover was created after classification of multispectral satel− lite imagery IKONOS−2 with spatial resolution 3.2 m (acquisition date – 12.08.2011). As a result, we created binary forest cover map with 2 categories: ‘forest’ and ‘not−forest’. That allowed us to compute the tree canopy cover for each pixel of Landsat 8 OLI, using vector grid with cell size of 30×30 m. Classification model was developed using training dataset that included 17,000 observations, 10,000 of them represented results of IKONOS−2 classification. Aiming to avoid errors of agricultural lands inclusion into forest mask because of lack of data, additionally we collected about 7000 random observations with canopy cover 0% that had been evenly distributed within unforested area. Random Forest (RF) model we developed allowed us to create continuous map of forests within study area that represents in each pixel value of tree canopy closeness (0−100%). To convert it into a discrete map, we recoded all values less than 30% as ‘no data’ and values from 30 to 100% as 1. Forest mask for two selected administrative districts of Chernihiv region (NE Ukraine) was created after screening map from small pixel groups that covered area less than 0.5 ha. Obtained results were compared with Global Forest Change (GFC) map and proved that GFC data can be used for forest mapping with tree canopy closeness threshold 40%. On considerable areas of abandoned agricultural lands in the analysed regions of Ukraine, forest stands are formed by Scots pine, silver birch, black alder and aspen. Existence of such forests substantially increases (on 6−8%) the forested area of Gorodnya and Snovsk districts of Chernihiv region – comparing to official forest inventory data. However, such stands are not protected and have high risks to be severed by wildfires, illegal cuttings with aim to renew the agricultural production, by diseases, insects and other natural disturbances.
    Źródło:
    Sylwan; 2019, 163, 09; 754-764
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zróżnicowanie sezonowe składu pokarmu sarny europejskiej na terenie Żytomierskiego Polesia Ukrainy
    The diet of the roe deer (Capreolus capreolus) in the forest ecosystems of Zhytomirske Polesie of the Ukraine
    Autorzy:
    Krasnov, V.
    Shelest, Z.
    Boiko, S.
    Gulik, I.
    Sieniawski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1310939.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    Ukraina
    Polesie Zytomierskie
    fauna
    sarna europejska
    Capreolus capreolus
    sklad pokarmu
    zmiany sezonowe
    foraging ecology
    stomach content analysis
    diet components
    Opis:
    The botanical composition of the European roe deer diet in the radioactively contaminated forest ecosystems of Zhytomirske Polesie of the Ukraine was investigated. Deer were caught monthly over a two–year period on three plots in forest habitats typical for Zhytomirske Polesie (fresh and moist mixed coniferous forests and mixed broadleaved forests). An analysis of the stomach contents of hunted deer showed that they consumed leafy as well as leafless stems, grasses, fruits and mushrooms depending on the season and availability of forest plants. Each season was characterized by one major dietary component. In the spring, the main component of the deer diet was the stems of woody plants. 44 species of vascular plants (3% of the natural flora of the region) were identified in the roe deer diet including 41 species of Magnoliophyta, of which 34 species of Magnoliopsida and 7 species of Liliopsida, 2 species of Polipodiophyta and one species of Pinophyta. Species such as aspen (Populus tremula), oak (Quercus robur), blackberry (Rubus nessensis) and bilberry (Vaccinium myrtillus) were consumed year-round.
    Źródło:
    Leśne Prace Badawcze; 2015, 76, 2; 184-190
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radioaktywne skażenie składu pokarmu sarny europejskiej Capreolus capreolus na terenie Żytomierskiego Polesia Ukrainy
    Radioactive contamination of dietary components of the roe deer in the forests of Zhytomirske Polesie of Ukraine
    Autorzy:
    Krasnov, V.
    Shelest, Z.
    Boiko, S.
    Gulik, I.
    Sieniawski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1311644.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    zwierzeta lowne
    sarny
    sarna europejska
    Capreolus capreolus
    pokarm
    sklad pokarmu
    podrost
    podszyt
    krzewinki
    grzyby
    skazenia radioaktywne
    cez promieniotworczy
    zawartosc cezu
    zmiennosc sezonowa
    Polesie Zytomierskie
    Ukraina
    radioactive contamination
    roe deer diet
    137Сs
    Zhytomirske Polesie of Ukraine
    Opis:
    This paper presents a study on radioactive contamination of dietary components of the roe deer (Capreolus capreolus) in Zhytomirske Polesie (Ukraine). Studies were conducted on two research plots in forests with similar levels of radioactive contamination, 29 ± 8 kBq/m2 - 55 ± 17 kBq/m2, in mixed coniferous forests and mixed broadleaved forests, which are the dominant forest types of the area. The highest level of radionuclide accumulation was observed in young oak seedlings. The dynamics for oak sprouts indicate that the accumulation coefficient reaches a maximum in September and August in the mixed coniferous and mixed broadleaved forests respectively. A comparison of mean values of the 137Cs accumulation coefficients in the shoots of undergrowth plants confirms that an increase in soil fertility leads to a reduction of radionuclides in plant phytomass. In the mixed broadleaved forests, average values of the coefficient of 137Cs accumulation in phytomass of blackberry was 26% and of raspberries 58% lower compared to mixed coniferous forests. The maximum contamination of phytomass was observed in August for oak, in October for aspen, and in July for birch. The highest specific activity of 137Cs in raspberry shoots occurs during the three summer months, whereas the peak in blackberry occurs from August to September. The dynamics of the specific activity of 137Cs in blueberry, cranberry and heather show an increase in radioactive contamination of phytomass towards the end of the growth period. The maximum concentration of 137Cs in shoots of heather and bilberry was recorded in October and for blueberry in August. Mushrooms in mixed coniferous forests can be ranked as follows according to the degree of 137Cs contamination: Cantharellus < Boletus edulis < Russula < Leccinum < Xerocomus badius < Paxillus involutus. In mixed broadleaved forests the ranking is Cantharellus < Boletus edulis < Russula < Xerocomus badius < Leccinum < Paxillus involutus. Within one habitat type, we observed fairly significant variations in 137Cs accumulation in fruit bodies of fungi species.
    Źródło:
    Leśne Prace Badawcze; 2015, 76, 3; 221-228
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bending strength (modulus of rupture) and modulus of elasticity of MDF different density at various temperature
    Wytrzymałość na zginanie i moduł sprężystości MDF o zmiennej gęstości i zmiennej temperaturze
    Autorzy:
    Kulman, S.
    Boiko, L.
    Antsyferova, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/8140.pdf
    Data publikacji:
    2015
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Źródło:
    Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2015, 91
    1898-5912
    Pojawia się w:
    Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Physicomechanical Properties of Nanostructured (TiHfZrNbVTa)N Coatings after Implantation of High Fluences of N⁺ (10¹⁸ cm¯²)
    Autorzy:
    Pogrebnjak, A.
    Bondar, O.
    Borba, S.
    Piotrowska, K.
    Boiko, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030134.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.46.-w
    62.20.Qp
    Opis:
    New classes of high-entropy alloys, which consist of at least 5 main elements with atomic concentrations 5-35 at.%, are under great interest in modern material science. It is also very important to explore the limits of resistance of high-entropy alloy nitrides to implantation by high-energy atoms. Structure and properties of nanostructured multicomponent (TiHfZrNbVTa)N coatings were investigated before and after ion implantation. We used the Rutherford backscattering, scanning electron microscopy with energy dispersive X-ray spectroscopy, high resolution transmission electron microscopy and scanning transmission electron microscopy with local microanalysis, X-ray diffraction and nanoindentation for investigations. Due to the high-fluence ion implantation (N⁺, the fluence was 10¹⁸ cm¯²) a multiphase structure was formed in the surface layer of the coating. This structure consisted of amorphous, nanocrystalline and initial nanostructured phases with small sizes of nanograins. Two phases were formed in the depth of the coating: fcc and hcp (with a small volume fraction). Nitrogen concentration reached 90 at.% near the surface and decreased with the depth. Nanohardness of the as-deposited coatings varied from 27 to 34 GPa depending on the deposition conditions. However, hardness decreased to a value of 12 GPa of the depth of the projected range after ion implantation and increased to 23 GPa for deeper layers.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 217-221
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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