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    Wyświetlanie 1-3 z 3
    Tytuł:
    Experimental Investigation of Interfacial Conditions between Fluid and Porous Layer Formed by Periodic Arrays of Circular and Non-Circular Cylinders
    Autorzy:
    Cihat Baytaş, A.
    Erdem, D.
    Acar, H.
    Cetiner, O.
    Başcı, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030800.pdf
    Data publikacji:
    2018-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    flows through porous media
    interfacial flows
    interface slip coefficient
    interface geometry
    composite channel
    PIV
    boundary condition
    Opis:
    In this experimental study, a flow through a two-dimensional channel partially containing porous media is investigated. A two-layer structure comprising of a saturated porous layer with an overlaying fluid flow layer in a rectangular horizontal channel is designed for the experiments. Flow characteristics at the interface between clear fluid and porous layer are investigated. The porous layer consists of cylindrical rod bundle placed horizontally on the side walls of the channel in arranged square arrays. In the experiments, water white oil is used as the working fluid to match the refractive index of the cylindrical rods made of Plexiglas. Visualizations and measurements have been acquired by digital particle image velocimetry system for the velocity profiles which help us to evaluate the interface velocity and slip coefficient at the interface region. The measurement of interface velocity profile is repeated for circular, square, and 45^{°} rotated square cylindrical rods to understand the effects of the structure of the interface region. It has been observed that dimensionless slip or interface velocity depends significantly on the surface structure at the interface region when cylindrical rods each with circular, square, and 45^{°} rotated square cross-sections are used as porous medium. The volumetric flow rate can be changed according to the cross-sections of cylindrical rods. The permeability for the different arrangements of cylindrical rods is computed by an analytical study. The dimensionless slip velocity, slip coefficient, particle image velocimetry images, experimental and numerical velocity vector maps, and velocity profiles at the interface are presented.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 5; 1314-1323
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of 2D Hybrid Cellular Automata with Periodic Boundary
    Autorzy:
    Acar, E.
    Uguz, S.
    Akin, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033502.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.10.Yn
    02.10.Ox
    07.05.Kf
    Opis:
    We investigate main theoretical aspects of two-dimensional linear-hybrid cellular automata with periodic boundary condition over the Galois field GF(2). We focus on the characterization of two-dimensional hybrid linear cellular automata by way of a special algorithm. Here we set up a relation between reversibility of cellular automata and characterization of two-dimensional hybrid linear cellular automata with a special boundary conditions, i.e. periodic case. The determination of the characterization problem of special type of cellular automaton is studied by means of the matrix algebra theory. It is believed that this type of cellular automata could find many different applications in special case situations, e.g. image processing area, textile design, video processing, DNA research, etc., in the near future.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 432-436
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular phylogenetic analysis resolving the taxonomic discrepancies among Salix L. species naturally found in Turkey
    Autorzy:
    Acar, P.
    Degirmenci, F.O.
    Duman, H.
    Kaya, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2130185.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Salix L.
    cpDNA
    nrDNA
    molecular phylogeny and dating
    Turkey
    Opis:
    Detailed phylogenetic relationships and molecular dating are still quite rare for the complex and diverse genus Salix L. Here we focus on the taxonomic status and phylogeny of twenty-six Salix taxa naturally found in Turkey using the chloroplast DNA regions (trn T-F, matK, and rbcL) to unravel the relationship among them. The status of Salix species was also checked in the phylogenetic tree constructed with the data from Internal Transcribed Spacer (ITS) region of nuclear gene, including 158 accessions from the GenBank and 126 newly generated sequences of 26 Salix taxa (24 species) naturally found in Turkey. The phylogenetic analysis of the sequence data from both the chloroplast (cpDNA) and nuclear (nrDNA) DNA regions enabled a reliable classification of the genus at the subgeneric level (Salix and Vetrix) with high posterior probability/ bootstrap values as 1/100. The study provides important information on the Salix phylogenetic placements and diverging times of S. pentandroides, S.apoda, S. armenorossica, S. pseudomedemii, S. pedicellata subsp. pedicellata, S. pseudodepressa, S. amplexicaulis, two subspecies of S.triandra, and two endemic species of Turkey (S. purpurea subsp. leucodermis and S. rizeensis) for the first time. Taxonomically, S. amplexicaulis and S. rizeensis previously classified under the subgenus Vetrix were clustered phylogenetically under the subgenus Salix. Subgenera Salix species appears to be diverged from the subg. Vetrix in Eocene (ca. 45.1 Mya) while the estimated divergence times of subg. Salix and subg. Vetrix dated back to 23.1 and 21.65 Mya, respectively. However, divergence times among species within Salix and Vetrix subgenera of Turkey seem to be around the Pliocene period. Molecular phylogenetic relationship between Salix species native to Turkey and Salix species from the world were mainly associated with taxonomic hierarchy, rather than geographic proximity.
    Źródło:
    Dendrobiology; 2022, 87; 13-26
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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