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Wyszukujesz frazę "Keller, B." wg kryterium: Autor


Wyświetlanie 1-7 z 7
Tytuł:
Spectroscopic Properties of Neodymium Perchlorates in 2-Halogeno Derivatives of Ethanol. Part II
Autorzy:
Keller, B.
Legendziewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1929789.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Wc
78.55.Hx
Opis:
The spectroscopic studies of anhydrous neodymium perchlorate in two series of 2-halogeno derivatives of ethyl alcohol are presented. The changes of intensities of $\text{}^{4}$I$\text{}_{9}\text{}_{/}\text{}_{2}$ → $\text{}^{2}$G$\text{}_{7}\text{}_{/}\text{}_{2}$, $\text{}^{4}$G$\text{}_{5}\text{}_{/}\text{}_{2}$ hypersensitive transitions are discussed within the framework of Mason's polarizability mechanism. Anomalous dependence of band intensities was found for the 2-fluoro derivatives. The linear relation of oscillator strength vs. solvent polarizability was broken for the 2-bromine and 2-iodine derivatives of ethyl alcohol. The effort was made for explanation of such strange results.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 903-907
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparison of Optical Properties of Eu$\text{}^{3+}$ Ions in the Silica Gel Glasses Obtained by Different Preparation Techniques
Autorzy:
Legendziewicz, J.
Stręk, W.
Sokolnicki, J.
Keller, B.
Borzechowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1945686.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Wc
78.55.Hx
71.55.Jv
Opis:
Silica sol-gel glasses doped with Eu$\text{}^{3+}$ ions were obtained by different preparation techniques. The absorption, emission and excitation spectra of the obtained glasses were measured in the range of 77-300 K. The energy level diagrams of Eu$\text{}^{3+}$ ions were derived. An intensity analysis of f-f transitions was performed. In particular, polymeric structure behaviour of europium compounds entrapped in silica gels glasses was temperature controlled during the preparation of glasses. Their optical properties were investigated.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 461-468
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reactive distillation for multiple-reaction systems: optimisation study using an evolutionary algorithm
Autorzy:
Keller, T.
Dreisewerd, B.
Górak, A.
Powiązania:
https://bibliotekanauki.pl/articles/185082.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nonequilibrium-stage model
Pareto front
multi-objective optimization
diethyl
carbonate
ethyl methyl carbonate
model równowagi
optymalizacja wielokryterialna
dietyl
węglan
etylo-węglan metylu
Opis:
Reactive distillation (RD) has already demonstrated its potential to significantly increase reactant conversion and the purity of the target product. Our work focuses on the application of RD to reaction systems that feature more than one main reaction. In such multiple-reaction systems, the application of RD would enhance not only the reactant conversion but also the selectivity of the target product. The potential of RD to improve the product selectivity of multiple reaction systems has not yet been fully exploited because of a shortage of available comprehensive experimental and theoretical studies. In the present article, we want to theoretically identify the full potential of RD technology in multiple-reaction systems by performing a detailed optimisation study. An evolutionary algorithm was applied and the obtained results were compared with those of a conventional stirred tank reactor to quantify the potential of RD to improve the target product selectivity of multiple-reaction systems. The consecutive transesterification of dimethyl carbonate with ethanol to form ethyl methyl carbonate and diethyl carbonate was used as a case study.
Źródło:
Chemical and Process Engineering; 2013, 34, 1; 17-38
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Czynniki wpływające na populację puszczyka Strix aluco na terenie Lasów Sobiborskich
Factors affecting breeding population of the Tawny Owl Strix aluco in Sobibor Forest
Autorzy:
Wozniak, B.
Wozniak, P.
Chodkiewicz, T.
Keller, M.
Powiązania:
https://bibliotekanauki.pl/articles/881547.pdf
Data publikacji:
2016
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Leśny Zakład Doświadczalny. Centrum Edukacji Przyrodniczo-Leśnej w Rogowie
Tematy:
Lasy Sobiborskie
ptaki
populacje zwierzat
populacje legowe
liczebnosc
zageszczenie populacji
sowy
puszczyk
Strix aluco
wielkosc zniesienia
wielkosc legu
sukces legowy
wybiorczosc siedliskowa
Źródło:
Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej; 2016, 18, 4[49A]
1509-1414
Pojawia się w:
Studia i Materiały Centrum Edukacji Przyrodniczo-Leśnej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exposure to environmental factors and relationship to allergic rhinitis and/or asthma
Autorzy:
Azalim, S.P.
Camargos, P.
Alves, A.L.
Senna, M.I.B.
Sakurai, E.
Schwabe Keller, W.
Powiązania:
https://bibliotekanauki.pl/articles/50599.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2014, 21, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication and Characterization of Thin Films of the Organic Superconductor α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$
Autorzy:
Moldenhauer, J.
Wachtel, H.
Schweitzer, D.
Gompf, B.
Eisenmenger, W.
Bele, P.
Brunner, H.
Keller, H. J.
Powiązania:
https://bibliotekanauki.pl/articles/1933377.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Kn
73.50.-h
81.15.Gh
Opis:
α-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$ is a quasi-two-dimensional organic metal with a metal-insulator phase transition at 135 K. Thermal treatment at about 80°C leads to the metallic system α$\text{}_{t}$-(BEDT-TTF)$\text{}_{2}$I$\text{}_{3}$, which becomes superconducting below 8 K. Thin films of the α-phase (thickness between 500 and 3000 Å) have been evaporated in high vacuum onto several substrates and characterized by means of X-ray diffraction, scanning electron microscopy, atomic force microscopy and low field microwave absorption. Depending on the temperature of the substrate and the evaporation rate, the films exhibit different degrees of microcrystallinity, which under certain conditions can be strongly reduced and a completely covering film can be obtained. X-ray diffraction spectra reveal a high orientation with the c-axis perpendicular to the substrate and as well the successful conversion into the α$\text{}_{t}$-phase by tempering. Scanning electron microscopy and atomic force microscopy investigations prove that the conversion takes place without reducing the mechanical quality of the films. Low-field microwave-absorption experiments show that the α$\text{}_{t}$-films become superconducting with an onset at 9 K.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 823-827
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ocena możliwości włączenia Lasów Sobiborskich do sieci obszarów Important Birds Areas oraz obszarów specjalnej ochrony ptaków
Possibility of inclusion of the Sobibór Forests into Importand Birds Areas and Special Protection Areas networks
Autorzy:
Kanclerska, K.
Karpińska, O.
Woźniak, B.
Grzębkowski, M.
Aftyka, S.
Belcik, M.
Bożycki, L.
Celej, M.
Chodkiewicz, T.
Kuszner, M.
Litwiniak, K.
Pawelec, M.
Pietrasz, K.
Rożycki, A.L.
Sikora, D.
Smith, L.
Stasiak, K.
Szewczuk, W.
Sliwiński, S.
Tylkowski, S.
Woźniak, M.
Woźniak, P.
Wójciak, J.
Żołądek, K.
Keller, M.
Powiązania:
https://bibliotekanauki.pl/articles/985820.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
ochrona przyrody
Lasy Sobiborskie
walory przyrodnicze
fauna
ptaki
ochrona zwierzat
Europejska Siec Ekologiczna Natura 2000
obszary specjalnej ochrony ptakow
bird protection areas
nature 2000 network
Opis:
One of the greatest challenges of nature conservation is to identify and locate networks of protected areas, which will preserve the biodiversity. The paper aims to show the ornithological value of the Sobibór Forests (E Poland) and to emphasize the fact that the network of Important Bird Areas (IBA) and Special Protection Areas within Natura 2000 (SPA) may require additions. The study was conducted in the period of 2008−2016, mainly on forested areas occupying 256 km2. The Sobibór Forests are characterized by a large diversity of habitats, but are mainly covered by Scots pine Pinus sylvestris. High diversity of wetlands and marshlands make the Sobibór Forest unique within the country. Three methodologies were used to estimate population size of chosen species: sampling, census and random observations. 31 species from Annex I of the Birds Directive plus 25 species of SPEC or non−SPECE category were observed which allows to consider this area as one of the most valuable for avifauna in Poland. Six breeding species classify the Sobibór Forests as the IBA and SPA. These species include Black Stork Ciconia nigra (8−13 breeding pairs), Common Crane Grus grus (80−120 breeding pairs), Grey Great Owl Strix nebulosa (0−7 breeding pairs i.e. 50−100% of Polish breeding population), Eagle Owl Bubo bubo (6 breeding pairs), White−backed Woodpecker Dendrocopos leucotos (40−70 breeding pairs) and Grey−headed Woodpecker Picus canus (20−40 breeding pairs). Six other species show potential for qualification, but not enough data has been collected yet. The list of this specie includes: Short−toed Snake Eagle Circaetus gallicus, Common Snipe Gallinago gallinago, Stock Dove Columba oenas, European Nightjar Caprimulgus europaeus, Collared Flycatcher Ficedula albicollis and Bluethroat Luscinia svecica. The Sobibór Forests occupy a small area compared to other IBA forests. However, the number of breeding species classifies the surveyed area as 7th among other IBAs. Moreover all eligible species may be considered as a bioindicators of the natural state of the forest. This is proof of the high natural value of this area.
Źródło:
Sylwan; 2018, 162, 02; 146-154
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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