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Wyszukujesz frazę "Ismael, A.A." wg kryterium: Autor

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    Wyświetlanie 1-7 z 7
    Tytuł:
    Alexandrium minutum cysts in sediment cores from the Eastern Harbour of Alexandria, Egypt
    Autorzy:
    Ismael, A.A.
    Khadr, A.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48863.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sediment core
    cyst
    Alexandria
    organic carbon
    Egypt
    Alexandrium minutum
    Opis:
    Alexandrium minutum cysts were studied in sediment cores from its type locality, the Eastern Harbour of Alexandria, following the disappearance of the species from the plankton since 1994. Three cores were sampled in the summer of 1999 along the north-south axis of the harbour. The sediments were subjected to grain size analysis and their organic carbon content was determined. The sediments consisted of medium, coarse and very coarse sand. Grain size and organic carbon content were negatively and significantly correlated in core 1 but followed a parallel trend in cores 2 and 3. Seven dinoflagellate cysts, representing 6 genera were identified from the cores. Their relative abundance showed a remarkable difference. A. minutum cysts contributed a maximum of 17.4% to the total cysts. The distribution profile of A. minutum cysts in the cores reflects the bloom duration but not its productivity. The cyst distribution in the cores is the resultant of two opposite processes, the sedimentation rate and the continuous erosion of the bottom sediments, which is not related to sediment texture.
    Źródło:
    Oceanologia; 2003, 45, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ecological indices as a tool for assessing pollution in El-Dekhaila Harbour (Alexandria, Egypt)
    Autorzy:
    Ismael, A.A.
    Dorgham, M.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/48906.pdf
    Data publikacji:
    2003
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    biomass
    euglenophyte
    Cyanoprokaryota
    temperature
    pollution
    Alexandria
    chlorophyte
    El-Dekhaila Harbour
    salinity
    phytoplankton
    Egypt
    Opis:
    Statistical analyses of data concerning the phytoplankton standing crop and biomass were applied as a tool for assessing pollution in El-Dekhaila Harbour. Univariate and multivariate analysis showed a succession of three clusters associated with salinity and temperature variations. The first and third clusters comprised mainly diatoms and dinoflagellates. The second cluster, richer in species, was dominated by brackish water cyanophytes, chlorophytes and euglenophytes. The diversity index ranged from 0.08 to 2.41. A high diversity was associated with high evenness, reflecting the multidominance pattern of cluster (2). On the other hand, multiple correlations between salinity and standing crop, richness and evenness, were negative and significant, but positive with the diversity index. The ABC curve showed that the k-dominance curve for numerical abundance extends above that for the biomass when clusters 1an d 3 are dominant. Both curves coincide more or less for another segment of the curve but when cluster 2 becomes dominant the numerical abundance curve runs below that of the biomass. Such a pattern may indicate unpolluted or moderate to heavily polluted conditions in El-Dekhaila Harbour. The present study reveals that the combination of univariate and multivariate analysis with the ABC curve provides a promising tool for the characterization of phytoplankton dynamics under stress conditions. On the other hand, the phytoplankton community in El-Dekhaila Harbour is stressed not by the inflow of brackish water but rather by the inflow of sea water. This is indicated by the higher diversity and evenness, and by the ABC curve during the dominance of cluster (2).
    Źródło:
    Oceanologia; 2003, 45, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Test results of the damaged T-section beams
    Wyniki badań doświadczalnych uszkodzonych belek o przekroju teowym
    Autorzy:
    Ismael, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2068360.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    belka teowa
    ugięcie belki
    nośność
    nośność resztkowa
    T-beam
    beam deflection
    bearing capacity
    load carrying capacity
    residual load carrying capacity
    Opis:
    The aim of the paper is the experimental determination of residual bearing capacity prototypes - beams with damaged shelf. Tests conducted to study the effect of beam damage on its residual load carrying capacity. In this paper it is proved that the type of damage affects the residual load-bearing captivity, the nature of the occurrence and the further development of cracks, the beam deflection.
    W artykule przedstawiono wyniki badań doświadczalnych belek teowych z uszkodzoną półką. Badania wykonano w celu przestudiowania wpływu uszkodzeń na resztkową nośność belek. Udowodniono, że rodzaj uszkodzenia wpływa na resztkową nośność, charakter występowania i dalszy rozwój rys oraz ugięcie belek.
    Źródło:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo; 2013, 19 (169); 20--25
    0860-7214
    Pojawia się w:
    Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation of turbulent flow field at downstream-facing round nosed pier
    Autorzy:
    Günal, M.
    Ismael, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1068628.pdf
    Data publikacji:
    2016-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    47.85.-g
    47.80.Cb
    Opis:
    Bridge pier in a flow induce turbulence and vortices that increase the risk of sediment bed scouring. The turbulent flow field around downstream-facing round nosed pier in a scoured bed was examined experimentally. The opposite bridge pier was embedded in a non-uniform soil with d₅₀=1.45 mm and σ_{g} =3.16. Experiments were carried out under live-bed condition. Flow velocities were measured with acoustic Doppler velocimeter. Measurement was conducted at the pier front. Result shows that the time-average velocity field, turbulent intensities and turbulent kinetic energy at different depths and distances from the original bed level differs. These results are benefiting for validation of three-dimensional flow model and turbulence close to the bridge pier.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 1; 126-127
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computing the Metric Dimension of a Graph from Primary Subgraphs
    Autorzy:
    Kuziak, Dorota
    Rodríguez-Velázquez, Juan A.
    Yero, Ismael G.
    Powiązania:
    https://bibliotekanauki.pl/articles/31342126.pdf
    Data publikacji:
    2017-02-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    metric dimension
    metric basis
    primary subgraphs
    rooted product graphs
    corona product graphs
    Opis:
    Let G be a connected graph. Given an ordered set W = {w1, . . ., wk} ⊆ V (G) and a vertex u ∈ V (G), the representation of u with respect to W is the ordered k-tuple (d(u, w1), d(u, w2), . . ., d(u, wk)), where d(u, wi) denotes the distance between u and wi. The set W is a metric generator for G if every two different vertices of G have distinct representations. A minimum cardinality metric generator is called a metric basis of G and its cardinality is called the metric dimension of G. It is well known that the problem of finding the metric dimension of a graph is NP-hard. In this paper we obtain closed formulae for the metric dimension of graphs with cut vertices. The main results are applied to specific constructions including rooted product graphs, corona product graphs, block graphs and chains of graphs.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2017, 37, 1; 273-293
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Closed Formulae for the Strong Metric Dimension of Lexicographic Product Graphs
    Autorzy:
    Kuziak, Dorota
    Yero, Ismael G.
    Rodríguez-Velázquez, Juan A.
    Powiązania:
    https://bibliotekanauki.pl/articles/31340465.pdf
    Data publikacji:
    2016-11-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    strong metric dimension
    strong metric basis
    strong metric generator
    lexicographic product graphs
    Opis:
    Given a connected graph G, a vertex w ∈ V (G) strongly resolves two vertices u, v ∈ V (G) if there exists some shortest u − w path containing v or some shortest v − w path containing u. A set S of vertices is a strong metric generator for G if every pair of vertices of G is strongly resolved by some vertex of S. The smallest cardinality of a strong metric generator for G is called the strong metric dimension of G. In this paper we obtain several relationships between the strong metric dimension of the lexicographic product of graphs and the strong metric dimension of its factor graphs.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2016, 36, 4; 1051-1064
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of explants type and orientation on growth and development of Mandevilla sanderi (Hemsl.) Woodson in vitro
    Autorzy:
    Kozak, D.
    Parzymies, M.
    Świstowska, A.
    Marcinek, B.
    Ismael, B.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/12663898.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Tematy:
    plant cultivation
    Brazilian jasmine
    Mandevilla sanderi
    ornamental plant
    flowering plant
    pot plant
    commercial plant
    plant growth
    plant development
    plant regeneration
    explant type
    multiplication
    decapitation
    defoliation
    in vitro culture
    tissue culture
    cultivation experiment
    Opis:
    Mandevilla sanderi is an important commercial ornamental pot plant. Traditional vegetative propagation is limited due to the low rate, therefore there is a need to develop an alternative, more efficient method. There is an interest in development of micropropagation technology for the species, as it allows to obtain a lot of offsprings in a relatively short time. The aim of the present work was to estimate an influence of explants type and position on regeneration of Mandevilla sanderi in tissue culture. Four different types of explants (leafy shoot tips, decapitated leafy shoot tips, defoliated shoot tips, decapitated and defoliated shoot tips) were used in the experiment, which were placed on the media vertically, while defoliated shoot tips were placed horizontally or vertically upside down. The explants were cultivated on a Murashige and Skoog (MS) medium supplemented with 1 mg·dm–3 benzyladenine (BA) and 0.5 mg·dm–3 indole-3-butyric acid (IBA). It was noted that both explants orientation and positioning, influenced the multiplication rate. Defoliated shoot tips placed horizontally were characterized by higher multiplication rate (6.8) in comparison to upside down vertical positioning (3.2). It was also observed that removal of shoot apex improved axillary branching, while defoliation of shoots placed in a normal position reduced multiplication rate.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2019, 18, 4; 111-119
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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