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    Wyświetlanie 1-5 z 5
    Tytuł:
    Photoluminescence and positron annihilation lifetime studies on pellets of ZnO nanocrystals
    Autorzy:
    Karbowski, A.
    Fedus, K.
    Patyk, J.
    Bujak, Ł.
    Służewski, K.
    Karwasz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148001.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    photoluminescence (PL)
    positron annihilation lifetime spectroscopy (PALS)
    X-ray diffraction (XRD)
    ZnO nanocrystals
    Opis:
    We explore the interrelationships between the X-ray diffraction patterns, the photoluminescence spectra and the positron lifetimes obtained from circular pellets composed of commercial ZnO nanoparticles. The experimental results are studied as a function of thermal treatment at different temperatures. X-ray diffractograms reveal the temperature- independent wurtzite phase structure of nanocrystals and show huge enlargement of ZnO grains after annealing at temperatures higher than 700 centigrade. Photoluminescence measurements exhibit two emission bands : a near band edge emission in UV (small tilde 378 nm) and a defect-related broad visible peak with a maximum in the green region ( small tilde 502 nm). The significant enhancement of the green emission at the expense of UV luminescence is observed after sample sintering at 800 and 1000 centigrade. The positron annihilation lifetime spectroscopy (PALS) is applied in order to study the thermally induced evolution of defects. The lifetime components show a step-like dependence on the thermal treatment, but do not follow exactly the variation in crystallographic phases and only vaguely follow differences in photoluminescence. The positron data indicate therefore some additional structural and/or defect changes. The possible origin of green luminescence from ZnO pellets is discussed.
    Źródło:
    Nukleonika; 2013, 58, 1; 189-194
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral Dependence of Fluorescence Enhancement in LH2-Au Nanoparticle Hybrid Nanostructures
    Autorzy:
    Bujak, L.
    Brotosudarmo, T.
    Czechowski, N.
    Olejnik, M.
    Ciszak, K.
    Litvin, R.
    Cogdell, R.
    Heiss, W.
    Mackowski, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419487.pdf
    Data publikacji:
    2012-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.80.Dj
    78.47.D-
    78.67.Qa
    82.35.Np
    Opis:
    We report on the influence of plasmon resonance in spherical gold nanoparticles on the optical properties of light-harvesting complex LH2 from the purple bacteria Rhodopseudomonas palustris. Systematic studies as a function of the excitation energy and the separation distance indicate that metal enhanced fluorescence shows strong dependence upon both of these parameters. We observe substantial increase of the fluorescence from LH2 complex in a hybrid nanostructure with 12 nm silica spacer. On the other hand, the enhancement measured with laser tuned into the plasmon resonance is almost threefold compared to the off-resonance configuration. The enhancement of fluorescence intensity originates in both cases from the increase of carotenoid absorption in the LH2 complex.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 2; 252-254
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new stratigraphic position of some Early Pleistocene deposits in central Poland
    Autorzy:
    Bujak, Ł.
    Woronko, B.
    Winter, H.
    Marcinkowski, B.
    Werner, T.
    Stachowicz-Rybka, R.
    Żarski, M.
    Woźniak, P. P.
    Rosowiecka, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060173.pdf
    Data publikacji:
    2016
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Late Miocene
    Early Pliocene
    Early Pleistocene
    pollen analysis
    palaeomagnetism
    mineralogy
    Central Poland
    Opis:
    A new borehole in Rożce (SW Mazovian Lowland) drilled in 2012, combined with a wide variety of research methods (palaeomagnetism, palynological analysis, studies of plant macroremains and textural features of deposits) shed new light on the age and stratigraphic position of the Early Pleistocene deposits, formerly assigned as the Lower Pleistocene. The study focuses on the deposits from 50.7-104.0 m depth, between glacial till of the Nidanian Glaciation (ca. 0.9 Ma) and the Poznań Clays (ca. 5.322 Ma). The deposits situated directly underneath the till (50.7-60.2 m) are related to the Nidanian Glaciation and show a reversed polarity and correlate with the end of the Matuyama Epoch. The deposits from 60.2-104.0 m depth were accumulated during the Early Pliocene, i.e. approximately 5.332-4.6 million years ago. They appear to correlate with the middle part of the Gilbert Palaeomagnetic Epoch and thus they are considerably older than previously thought. The cored section indicates a stratigraphic gap of about 3.5 Ma from the Lower Pliocene to the first advance of the Scandinavian ice sheets into Poland, which are thought to have occurred in the early Middle Pleistocene. The analysed deposits accumulated under variable climatic conditions showing two periods with significant aridity alternated with two periods of increased humidity. Deposits of the arid periods contain no pollen, butaeolian sand quartz grains are found. During periods of more humid climate the area was covered by various types of mixed forest.
    Źródło:
    Geological Quarterly; 2016, 60, 1; 238--251
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plasmon Enhancement of Fluorescence in Single Light-Harvesting Complexes from em Amphidinium carterae
    Autorzy:
    Bujak, Ł.
    Piątkowski, D.
    Mackowski, S.
    Wörmke, S.
    Jung, C.
    Bräuchle, C.
    Agarwal, A.
    Kotov, N.
    Schulte, T.
    Hofmann, E.
    Brotosudarmo, T.
    Scheer, H.
    Govorov, A.
    Hiller, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807594.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.80.Nj
    87.14.E-
    87.64.M-
    Opis:
    We show that single peridinin-chlorophyll a-protein light-harvesting complexes from dinoflagellate Amphidinium carterae placed near to silver nanoparticles show strongly enhanced fluorescence emission. Single molecule spectroscopy experiments performed at room temperature point toward an enhancement of more than an order of magnitude for optimal conditions. Irrespective of the enhancement, we observe no effect of the metal nanoparticle on the fluorescence emission energy of the complex. This result provides a way to control the optical properties of biomolecules via plasmon excitations in metal nanoparticles.
    Źródło:
    Acta Physica Polonica A; 2009, 116, S; S-22-S-25
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of xenia in F1 seeds of yellow-grain winter-rye lines.
    Autorzy:
    Kaczmarek, J.
    Bujak, H.
    Kadłubiec, W.
    Grochowski, L.
    Galek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2198801.pdf
    Data publikacji:
    2001-12-20
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    rye
    quantitative xenia
    heterosis hybrid
    open pollination
    Opis:
    The object of research were F1 hybrid grains of winter rye resulting from the topcross of 90 yellow-seed inbred lines with the green-seed tester SMH-108. The degree of crossing ability and the effect of xenia on 1000-grain weight were confirmed. In the present investigation quantitative xenia was analysed with regard to the green colour of grain. In the collection of 90 inbred lines of yellow grain differences in% of crossing were ascertained and in 26.7% of the analysed lines a significant quantitative xenia (1000-grain weight) was found. Among the 90 lines as much as 28.9% gave, in conditions of open pollination, from 66 to 85% of hybrid grain. Four lines were selected, which gave a quantitative xenia in 38, 25, 20 and 12% and crossing of 57, 84, 58 and 74%. These lines may be of practical use in producing heterosis hybrids.
    Źródło:
    Plant Breeding and Seed Science; 2001, 45, 2; 3-10
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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