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Wyszukujesz frazę "Ahmed, L. A." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    3-Dimensional Surface Magnetic Susceptibility Distributions with Depth to Investigate Anthropogenic Pollutants Boundary in Abuja Metropolis
    Autorzy:
    Jatto, S. S.
    Sule, P. O.
    Ahmed, L. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/184649.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    vertical distribution
    soil pollution
    magnetic susceptibility
    anthropogenic pollutants
    Abuja
    Opis:
    Changes in the magnetic susceptibility of topsoil, especially in urban areas, are greatly affected by the deposition of anthropogenic metallic dust arising from industrial activities, the burning of fossil fuels, car wear, and tyre abrasion. In this study, magnetic susceptibility measurements were carried out in vertical soil profiles of 30.0 cm depth from the surface at 10.0 cm intervals in about 431 locations within the Abuja metropolis with a view to investigate the penetration ability of magnetic pollutants in the ground. From the obtained data, 3-D surface contour maps were plotted for different depths. The results show a magnetic susceptibility decrease from the surface down the ground to the depth of 30.0cm; most of the recorded susceptibilities were of an anthropogenic origin rather than pedogenic activities. This indicates that the anthropogenic dust depositions are mostly a surface phenomenon and may therefore not pose a risk to groundwater aquifers and near surface wells.
    Źródło:
    Geology, Geophysics and Environment; 2016, 42, 4; 443-448
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using Diversity for Classifier Ensemble Pruning : an Empirical Investigation
    Autorzy:
    Ahmed, M. A. O.
    Didaci, L.
    Lavi, B.
    Fumera, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/375851.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multiple classifier systems
    ensemble pruning
    diversity measures
    Opis:
    The concept of `diversity' has been one of the main open issues in the field of multiple classifier systems. In this paper we address a facet of diversity related to its effectiveness for ensemble construction, namely, explicitly using diversity measures for ensemble construction techniques based on the kind of overproduce and choose strategy known as ensemble pruning. Such a strategy consists of selecting the (hopefully) more accurate subset of classifiers out of an original, larger ensemble. Whereas several existing pruning methods use some combination of individual classifiers' accuracy and diversity, it is still unclear whether such an evaluation function is better than the bare estimate of ensemble accuracy. We empirically investigate this issue by comparing two evaluation functions in the context of ensemble pruning: the estimate of ensemble accuracy, and its linear combination with several well-known diversity measures. This can also be viewed as using diversity as a regularizer, as suggested by some authors. To this aim we use a pruning method based on forward selection, since it allows a direct comparison between different evaluation functions. Experiments on thirty-seven benchmark data sets, four diversity measures and three base classifiers provide evidence that using diversity measures for ensemble pruning can be advantageous over using only ensemble accuracy, and that diversity measures can act as regularizers in this context
    Źródło:
    Theoretical and Applied Informatics; 2017, 29, 1-2; 25-39
    1896-5334
    Pojawia się w:
    Theoretical and Applied Informatics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study of Sb₂O₃ (Sb₂O₅) and Ta₂O₅ doping effects with TeO₂ on electrical properties of δ-Bi₂O₃
    Autorzy:
    Loubbidi, L.
    Chagraoui, A.
    Villain, S.
    Bourja, L.
    Orayech, B.
    Ait Sidi Ahmed, O.
    Moussaoui, A.
    Tairi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1154652.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Je
    82.47.Ed
    Opis:
    In this study, Sb₂O₃ (Sb₂O₅) and Ta₂O₅ are used as co-dopants with TeO₂ to stabilize the delta phase of bismuth oxide (δ -Bi₂O₃). Some compositions with formula (1-x) BiO_{1.5}-(x/4) Sb₂Te₂O₉ and (1-x) BiO_{1.5}-(x/4) Ta₂Te₂O₉ (x=0.1, 0.2, 0.3, 0.6, and 0.9) have been synthesized by solid state reaction at 850°C and characterized by powder X-ray diffraction. The Bi_{0.9}Sb_{0.05}Te_{0.05}O_{1.575}, Bi_{0.9}Ta_{0.05}Te_{0.05}O_{1.575} and Bi_{0.8}Ta_{0.1}Te_{0.1}O_{1.65} retain a cubic fluorite structure of δ -Bi₂O₃ phase. The electric properties were studied by impedance spectroscopy. All samples were evaluated by calculating conductivities and activation energies. Various impedance model including constant phase element and the Warburg impedances have been used to interpret the Nyquist representations of electrical analyses.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 862-865
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of (SnO2)1-x(ZnO)x Thin Films Prepared by Spray Paralysis Technique
    Autorzy:
    Nahida, Bukhееt Hasan
    Zahra'a, Adеl Jawad
    Mohammed, Ahmed Mohammed
    Huda, Bukhееt Hasan
    Powiązania:
    https://bibliotekanauki.pl/articles/1179187.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    optical propеrtiеs
    spray pyrolysis tеchniquе
    thin films
    еnеrgy gap
    Opis:
    Thе study of thе optical propеrtiеs is usеful in thе task of dеtеrmining thе naturе of thе practical application that can bе usеd to rеcord film matеrial. Thе optical propеrtiеs of thе mixеd (SnO2)1−x(ZnO)x thin films dеpositеd on a glass substratе by spray pyrolysis tеchniquе (SPT) at a substratе tеmpеraturе 400 °C havе bееn invеstigatеd by thе transmission spеctra at room tеmpеraturе wеrе mеasurеd in thе rangе from 300 to 1100 nm.Thе optical study rеvеalеd that thе films wеrе highly absorbеd with a dirеct typе of transition. Also thе dirеct еnеrgy gap was obsеrvеd to incrеasе with incrеasing of ZnO Vol.%
    Źródło:
    World Scientific News; 2017, 83; 182-193
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generation of shock waves in dense plasmas by high-intensity laser pulses
    Autorzy:
    Pasley, J.
    Bush, I. A.
    Robinson, A. P. L.
    Rajeev, P. P.
    Mondal, S.
    Lad, A. D.
    Ahmed, S.
    Narayanan, V.
    Ravindra Kumar, D
    Kingham, R. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147346.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    shock waves
    radiation hydrodynamics
    laser–plasma interactions
    fast ignition
    inertial confinement fusion
    Doppler spectroscopy
    Opis:
    When intense short-pulse laser beams (I > 1022 W/m2, τ < 20 ps) interact with high density plasmas, strong shock waves are launched. These shock waves may be generated by a range of processes, and the relative significance of the various mechanisms driving the formation of these shock waves is not well understood. It is challenging to obtain experimental data on shock waves near the focus of such intense laser–plasma interactions. The hydrodynamics of such interactions is, however, of great importance to fast ignition based inertial confinement fusion schemes as it places limits upon the time available for depositing energy in the compressed fuel, and thereby directly affects the laser requirements. In this manuscript we present the results of magnetohydrodynamic simulations showing the formation of shock waves under such conditions, driven by the j × B force and the thermal pressure gradient (where j is the current density and B the magnetic field strength). The time it takes for shock waves to form is evaluated over a wide range of material and current densities. It is shown that the formation of intense relativistic electron current driven shock waves and other related hydrodynamic phenomena may be expected over time scales of relevance to intense laser–plasma experiments and the fast ignition approach to inertial confi nement fusion. A newly emerging technique for studying such interactions is also discussed. This approach is based upon Doppler spectroscopy and offers promise for investigating early time shock wave hydrodynamics launched by intense laser pulses.
    Źródło:
    Nukleonika; 2015, 60, 2; 193-198
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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