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Wyszukujesz frazę "Bielak, M." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Dokładność pomiaru wybranymi dalmierzami laserowymi w środowisku leśnym
    Measurements accuracy of selected laser rangefinders in the forest environment
    Autorzy:
    Brach, M.
    Bielak, K.
    Drozdowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/993397.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    geodezja lesna
    drzewostany
    pomiary
    dalmierze laserowe
    dalmierz ForestPro
    dalmierz TruPulse 360
    polozenie drzew
    ciagi busolowe
    dokladnosc pomiaru
    forest geodesy
    forest inventory
    laser rangefinder
    silvicultural planning
    Opis:
    Paper presents results of measurement accuracy evaluation of two laser rangefinders (TruPulse and ForestPro integrated with MapStar compass) mounted on monopod and tripod under the forest conditions. The precise data on spatial coordinates of 34 trees in the Rogów Arboretum and 8 points from the geodetic control network in the Głuchów Forest were used. The results show that the measurement sets equipped with ForestPro and MapStar were more accurate than TruPulse ones. However, no significant influence of applied stands on the measurement accuracy was observed.
    Źródło:
    Sylwan; 2013, 157, 09; 671-677
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of nitrogen in carrier confinement potential engineering and optical properties of GaAs-based quantum wells heterostructures
    Autorzy:
    Pucicki, D.
    Bielak, K.
    Dawidowski, W.
    Ściana, B.
    Tłaczała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/174427.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    dilute nitrides
    optical properties
    carrier confinement
    photoluminescence
    Opis:
    In this work, the authors present the results of optical characterization of GaAs-based multiple quantum well heterostructures, together with energy band structure analysis. The optical properties were investigated by applying photoluminescence spectroscopy. Structures with GaInNAs, GaInAs and GaNAs multiple quantum wells emitting around 1 μm, grown by atmospheric pressure metalorganic vapor phase epitaxy, were compared in this work. The role of nitrogen in quantum well carriers confinement potential was analysed. The photoluminescence intensities of the samples were correlated with the analysis of energy band structures and the overlaps of the carriers’ wave functions. In addition, the main carrier activation energies were estimated based on photoluminescence temperature dependence and the Arrhenius plots analysis. It was deduced that the thermal photoluminescence decay is most probably related to the escape of electrons whereas the holes, independently of the potential well depth, are additionally confined by the local inhomogeneities or by the Coulomb interaction with the confined electrons.
    Źródło:
    Optica Applicata; 2016, 46, 2; 255-263
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wielocechowa ocena potomstwa populacji buka zwyczajnego (Fagus sylvatica L.) z południowo-wschodniej Polski w początkowych latach wzrostu
    Multivariable evaluation of the early growth performance of European beech (Fagus sylvatica L.) provenances from south-eastern Poland
    Autorzy:
    Buraczyk, W.
    Szeligowski, H.
    Studnicki, M.
    Drozdowski, S.
    Bielak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/989437.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    hodowla lasu
    drzewa lesne
    buk zwyczajny
    Fagus sylvatica
    proweniencje
    drzewa potomne
    przezywalnosc
    wzrost roslin
    cechy fenologiczne
    jakosc hodowlana
    doswiadczenia proweniencyjne
    Nadlesnictwo Losie
    genetic variability
    growth parameters
    morphological traits
    phenology
    progeny testing
    Opis:
    European beech is one of the most important broadleaved tree species in Poland and will play probably even more significant role in the future due to the predicted climate change. The main objectives of this study was to analyse and compare the growth parameters and morphological traits between 23 European beech provenances from south−eastern Poland (fig. 1). The research was conducted on the experimental plot established in Łosie Forest District in 2006. The experiment employed a randomized complete block design consisting of 92 plots (23 provenances×4 blocks). On each plot 100 trees representing given provenance were planted in 1.5×1.5 m spacing. In the spring and autumn 2015 we measured and determined the following parameters for the subsample of 36 trees on each plot: survival rate, tree height, diameter at breast height, diameter of the branch at the middle height of the crown length, stem straightness, crown shape, tendency to create forks, mean angle between stem and branches and spring phenology. We also included different eco−physiographical characteristics for each provenances (tab. 1). We performed basic statistics to describe mean values and standard errors (fig. 2, tab. 2) and finally we quantified the interaction between traits and eco−physiographical characteristics by Principal Component Analysis (PCA) (fig 3, tab. 3). The obtained results indicates that under growth conditions on experimental trial in Łosie Forest District, the provenances from lower elevated regions with lower precipitation and higher mean temperature (i.e. more arid conditions; Kielce and Narol provenances) were characterized by thicker dbh and branch dimeters in contrast to regions from southern Poland (Łosie, Bricza 1, Stary Sącz and Nawojowa). European beech provenances from regions with more humid conditions and lower mean annual temperature, as well as shorter vegetation season are characterized by higher survival rate. They are also higher than other provenances, but reveal the lower ratio dbh to branch diameter.
    Źródło:
    Sylwan; 2016, 160, 12; 981-992
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność wybranych cech potomstwa buka zwyczajnego (Fagus sylvatica L.) na powierzchni testowania w Nadleśnictwie Łosie
    Variability of selected features in progeny of the common beech (Fagus sylvatica L.) grown on the experimental plot in the Losie Forest District
    Autorzy:
    Szeligowski, H.
    Buraczyk, W.
    Drozdowski, S.
    Bielak, K.
    Widawska, Z.
    Będkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/979509.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drzewa lesne
    buk zwyczajny
    Fagus sylvatica
    proweniencje
    drzewa potomne
    zmiennosc cech
    przezywalnosc
    wysokosc drzew
    piersnice drzew
    fenologia
    wartosc hodowlana
    doswiadczenia proweniencyjne
    Nadlesnictwo Losie
    common beech
    provenance
    variability
    silvicultural value
    lesnictwo
    hodowla lasu
    Opis:
    This paper presents the genetic variability in the growth parameters and morphological traits, as well as the silvicultural quality of progeny of 23 European beech (Fagus sylvatica L.) provenances from south−eastern Poland. The research was conducted on the experimental plot established in the Łosie Forest District in spring 2006. After 10 years, during the spring and autumn, we determined and measured the spring phenology and survival rate, the diameter at breast height (dbh), the tree height, and the straightness of trunk. The results obtained point out the considerable variability of analysed features, both within and between different beech populations (tab.). Highest and lowest survival rates are noted for the beeches from Lutowiska and Leżajsk (populations 451 and 461), respectively (fig. 2). Lowest mean height and dbh were achieved by beeches from Bircza (453), while the tallest and broadest trees were from the Kielce population (390) (fig. 3−4). The overall silvicultural assessment based on survival, height, dbh, spring phenological phases and straightness of the trunk revealed that the most valuable populations of beech are those originating from Kielce (390), Bircza (454), Strzyżów (459), Lesko (452), Rymanów (457) and Lutowiska (451). In turn, the analysis resulted in least favourable assessments for beeches from Bircza (453) and Gromnik (362). Thus, we confirmed also that trees of local origin are not always best−adapted to (and do not always grow best in) the place they originate from. The obtained results are highly relevant from the principles of creating the seed source regions for beech in Poland, as the proper selection of a population for the given place of growth may yield benefits for forest ecology and management.
    Źródło:
    Sylwan; 2019, 163, 03
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    AP-MOVPE Technology and Characterization of InGaAsN p-i-n Subcell for InGaAsN/GaAs Tandem Solar Cell
    Autorzy:
    Dawidowski, W.
    Ściana, B.
    Zborowska-Lindert, I.
    Mikolásek, M.
    Latkowska, M.
    Radziewicz, D.
    Pucicki, D.
    Bielak, K.
    Badura, M.
    Kováč, J.
    Tłaczała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226630.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dilute nitrides
    AP MOVPE
    subcell
    tandem solar cell
    J-V characteristics
    Opis:
    Tandem (two p-n junctions connected by tunnel junction) and multijunction solar cells (MJSCs) based on AIIIBV semiconductor compounds and alloys are the most effective photovoltaic devices. Record efficiency of the MJSCs exceeds 44% under concentrated sunlight. Individual subcells connected in series by tunnel junctions are crucial components of these devices. In this paper we present atmospheric pressure metal organic vapour phase epitaxy (AP-MOVPE) of InGaAsN based subcell for InGaAsN/GaAs tandem solar cell. The parameters of epitaxial structure (optical and electrical), fabrication process of the test solar cell devices and current-voltage (J-V) characteristics are presented and discussed.
    Źródło:
    International Journal of Electronics and Telecommunications; 2014, 60, 2; 151-156
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technology and properties of low-pressure metalorganic vapour phase epitaxy grown InGaAs/AlInAs superlattice for quantum cascade laser applications
    Autorzy:
    Badura, M.
    Bielak, K.
    Ściana, B.
    Radziewicz, D.
    Pucicki, D.
    Dawidowski, W.
    Żelazna, K.
    Kudrawiec, R.
    Tłaczała, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/173549.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    InGaAs
    AlInAs
    superlattice
    metalorganic vapour phase epitaxy
    MOVPE
    quantum cascade laser
    QCL
    Opis:
    Quantum cascade laser is one of the most sophisticated semiconductor devices. The active region of the quantum cascade laser consists of hundreds thin layers, thus the deposition precision is the most crucial. The main technique for the fabrication of quantum cascade laser structure is molecular beam epitaxy, however, the prevalence of metalorganic vapour phase epitaxy techniques in the fabrication of semiconductor structures causes a perpetual work on the improvement production of the entire quantum cascade laser structure by the metalorganic vapour phase epitaxy. The paper presents technological aspects connected with the metalorganic vapour phase epitaxy growth of InGaAs/AlInAs low-dimensional structures for quantum cascade laser active region emitting ~9.6 μm radiation. Epitaxial growth of superlattice made of InGaAs/AlInAs lattice matched to InP was conducted at the AIXTRON 3x2″ FT system. Optical and structural properties of such heterostructures were characterised by means of high resolution X-ray diffraction, photoluminescence, contactless electroreflectance and scanning electron microscope techniques. Epitaxial growth and possible solutions of structure improvements are discussed.
    Źródło:
    Optica Applicata; 2016, 46, 2; 241-248
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zagrożone gatunki drzew Białowieskiego Parku Narodowego (Rezerwat Ścisły)
    Threatened tree species of the Bialowieza National Park (the Strict Reserve)
    Autorzy:
    Brzeziecki, B.
    Keczyński, A.
    Zajączkowski, J.
    Drozdowski, S.
    Gawron, L.
    Buraczyk, W.
    Bielak, K.
    Szeligowski, H.
    Dzwonkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1007075.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    hodowla lasu
    Bialowieski Park Narodowy
    rezerwaty scisle
    Obreb Ochronny Orlowka
    stale powierzchnie obserwacyjne
    sklad gatunkowy
    drzewa lesne
    grab
    lipa
    swierk
    olsza
    brzoza
    dab
    sosna
    jesion
    klon
    wiaz
    topola osika
    zageszczenie populacji
    liczebnosc
    struktura grubosci
    gatunki dominujace
    gatunki zagrozone
    diameter distribution
    dynamic status
    large−scale inventory
    long−term trend
    natural forest
    permanent plot
    population density
    population dynamics
    strict protection
    Opis:
    An assessment of the current dynamic status of tree species occurring in the Strict Reserve of the Białowieża National Park is presented. On the basis of long−term trends and analysis of large−scale inventory data, the three major groups of trees are distinguished: 1) ‘safe’ group, containing hornbeam and lime, 2) ‘presently safe, but declining in a long−term run’ group, involving spruce, birch and alder, and 3) ‘threatened and highly threatened’ group, consisting of oak, pine, ash, maple, elm and aspen.
    Źródło:
    Sylwan; 2012, 156, 04; 252-261
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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