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    Wyświetlanie 1-5 z 5
    Tytuł:
    Generalized morphisms of abelian m-ary groups
    Autorzy:
    Gal'mak, Alexander
    Powiązania:
    https://bibliotekanauki.pl/articles/728778.pdf
    Data publikacji:
    2001
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    n-ary endomorphism
    m-ary group
    (m,n)-ring
    Opis:
    We prove that the set of all n-ary endomorphisms of an abelian m-ary group forms an (m,n)-ring.
    Źródło:
    Discussiones Mathematicae - General Algebra and Applications; 2001, 21, 1; 47-55
    1509-9415
    Pojawia się w:
    Discussiones Mathematicae - General Algebra and Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heterostructure photonic crystal multichannel drop filter based on microcavities and ring resonators
    Autorzy:
    Amirkhani-Shahraki, A
    Shahraki, M N
    Mosavi, M.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/174469.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    finite difference time domain method
    ring resonators
    heterostructure
    microcavities
    photonic crystal integrated circuits
    Opis:
    In this paper, a heterostructure photonic crystal multichannel drop filter based on ring resonators and microcavities is presented. This structure has been made in the form of a two-dimensional square lattice with two regions with refractive indexes of 3.464 and 3.86. The refractive indexes are so chosen as to allow the easy and practical fabrication of the device. The presented heterostructure photonic crystal multichannel drop filter consists of a waveguide, two ring resonators and a microcavity. This microcavity is placed at the end of the bus waveguide. The ring resonators have been installed in two regions with different refractive indexes. These ring resonators act as energy couplers, and at their resonance frequencies, they capture the electromagnetic energy which is transmitted in the bus waveguide. Filter characteristics have been obtained by using the finite difference time domain method. Finally, we will demonstrate that in the optimal structure, at ports B and D (vertical), drop efficiencies close to 90% and 67%, respectively, can be obtained within the third communication window, and at port C (horizontal), an efficiency of almost 80% can be achieved within the second communication window.
    Źródło:
    Optica Applicata; 2014, 44, 1; 5-15
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Coupling in Core-Ring Photonic Crystal Fibers
    Autorzy:
    Palka, N.
    Ciurapiński, W.
    Wojcik, J.
    Szustakowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811539.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.81.Bm
    42.81.Cn
    42.81.Dp
    Opis:
    Experimental investigations of light coupling from a core into a ring caused by microbendings in photonic crystal fibres are shown. We present a setup arrangement, mode fields with and without coupling and a plot of power transfer versus localisation of the modulator along the fibre. We also show the most probable explanation of the obtained data.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6A; A-157-A-161
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First record of Tomato black ring virus [TBRV] in the natural infection of Cucumis sativus in Poland
    Autorzy:
    Pospieszny, H
    Jonczyk, M.
    Borodynko, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/65241.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    serology
    infection
    natural infection
    Polska
    satellite RNA
    tomato black ring virus
    cucumber
    Cucumis sativus
    Źródło:
    Journal of Plant Protection Research; 2003, 43, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of juniper stands and the impact of environmental parameters on growth in the drought-stressed forest-steppe zone of Central Anatolia
    Autorzy:
    Kahveci, G.
    Alan, M.
    Köse, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077936.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Dendrochronology
    dendroecology
    tree-ring width
    exposure
    Opis:
    Juniper is one of the three main tree species in Central Anatolia, where it grows under extreme environmental conditions. Although dendrochronological studies of juniper are challenging because of cross-dating problems, these types of studies on long-lived tree species have the potential to provide long time series, which reflect changes in climatic conditions. Juniper has been neglected as a scientific research subject in Turkey due to degraded populations and low economic expectations. This study analysed the distribution and present state of Juniperus spp. (Juniperus excelsa M. Bieb., Juniperus oxycedrus L., and Juniperus foetidissima Willd.) stands and used dendrochronological data to examine relationships between growth and environmental parameters. We hypothesised that there may be differences in the radial growth of juniper in areas of different exposure in drought regions. During a field survey, we sampled 31 plots of 25 m × 20 m and data, including information on wood cores, were collected. For dendrochronological investigation, 95 wood cores were manually measured and cross-dated. Residual chronologies of tree-ring width series of juniper from four wind directions and regional chronology of Kirikkale and Ankara Province were provided and similarities between the chronologies were tested using Gleichläufigkeits test. The relationships be- tween climate parameters and growth were examined using a simple correlation analysis and multiple lin- ear regression model analysis in SAS 9.0 program and response function analysis in the DENROCLIM2002 program. The results of this study indicated that Juniperus spp. in Central Anatolia are sensitive to envi- ronmental parameters and mainly respond to changes in precipitation. Juniper show differences in radial growth in areas of different exposure in drought regions. We conclude that juniper may offer an excellent opportunity for large-scale dendrochronological and dendroecological studies in drought regions.
    Źródło:
    Dendrobiology; 2018, 80; 61-69
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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