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Wyszukujesz frazę "Elnaggar, A. M." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Photoinduced Operation by Absorption of the Chalcogenide Nanocrystallite Containing Solar Cells
    Autorzy:
    Elnaggar, A. M.
    Albassam, A.
    Oźga, K.
    Jędryka, J.
    Szota, M.
    Myronchuk, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/357002.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    photovoltaic cell materials
    chalcogenide layers
    photoinduced absorption
    laser treatment
    nanocrystlalline treatment
    Opis:
    It is shown that for the solar cells containing chalcogenide nanocrystallites using external laser light, one can achieve some enhancement of the photovoltaic efficiency. Photoinduced treatment was carried out using two beams of splitted Er: glass laser operating at 1.54 μm. The light of the laser was incident at different angles and the angles between the beams also were varied. Also, the studies of nanocomposite effective structures have shown enhancement of effective nanocrystalline sizes during the laser treatment. Nanocrystallites of CuInS2 and CuZnSnS4 (CZTS) were used as chalcogenide materials. The optimization of the laser beam intensities and nanoparticle sizes were explored.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1953-1956
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insecticidal efficiency and safety of zinc oxide and hydrophilic silica nanoparticles against some stored seed insects
    Autorzy:
    Haroun, S.A.
    Elnaggar, M.E.
    Zein, D.M.
    Gad, R.I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2084748.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Callosobruchus maculatus
    hydrophilic silica nanoparticles
    Sitophilus oryzae
    Tribolium castaneum
    wheat
    zinc oxide nanoparticles
    Opis:
    The present study was conducted to evaluate the insecticidal efficiency and safety of zinc oxide nanoparticles (ZnO NPs) and hydrophilic silica nanoparticles (SiO2 NPs) against: adults of rice weevil (Sitophilus oryzae L.); red flour beetle (Tribolium castaneum Herbst.) and cowpea beetle (Callosobruchus maculatus F.) results showed that, both ZnO NPs and hydrophilic SiO2 NPs exhibited a significant toxic effect (df, F and p < 0.5) against S. oryzae and C. maculatus at the highest concentration while T. castaneum showed high resistance against the two tested materials. At the end of the experiment, recorded mortality was: 81.6, 98.3 and 58.3% at the highest concentration used for each insect (0.3, 2 and 8 gm ⋅ kg–1 of SNPs with C. maculatus, S. oryzae and T. castaneum, respectively), while mortality was 88.3, 100 and 38.3% at the highest concentration used for each insect (0.6, 2.5 and 8 gm ⋅ kg–1 of ZnO NPs with C. maculatus, S. oryzae and T. castaneum, respectively). Both tested materials caused high reductions in F1-progeny (%) with C. maculatus and S. oryzae. Histopathological examination of male mice livers showed hepatic architecture with congested blood sinusoids, binucleated hepatocytes nuclei, dilated central vein and margainated chromatin in some nuclei. Histopathological assessment of the lungs showed normal histoarchitecture. There were no differences in alveolar septa, bronchiolar and epithelium of the treated and untreated animals. Silica and zinc oxide nanoparticles have a good potential to be used as stored seed protectant alternatives if applied with proper safety precautions.
    Źródło:
    Journal of Plant Protection Research; 2020, 60, 1; 77-85
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural Transition in SrZnO Laser Pulse Deposited Alloy
    Autorzy:
    Albrithen, H. A.
    Elnaggar, M.
    Ozga, K.
    Szota, M.
    Alahmed, Z. A.
    Alanazi, A. Q.
    Alshahrani, H.
    Alfaifi, E.
    Djouadi, M. A.
    Labis, J. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/355190.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    oxide materials
    solid state alloys
    structural phase transition
    X-ray diffraction
    scanning electron microscopy
    Opis:
    We have discovered a structural transition for the SrZnO alloy films from a wurtzite to a rock-salt structure, leading to a reduction in the (112̲0)/(0001) surface energy ratio. The films were grown by pulsed laser deposition using different SrO ratios, x. We have revealed that growth at a higher temperature, 750°C, resulted in a sharp 0002 peak at a low SrO content (5%), whereas growth at a higher SrO content (10%) resulted in a non-crystalline film with minute crystallites with a (112̲0) orientation. Generally the crystallinity decreased as the SrO content increased. No results obtained for the crystalline films showed any orientation of significant peaks besides the peak attributed to the (0001) plane, suggesting epitaxial growth. Optical measurements showed difference in transmission widows of alloys with different SrO percentage, and this was correlated to SrO influence on growth mode as indicated by scanning electron imaging. The studied SrZnO films, with SrO/(SrO + ZnO) ≤ 0.25, were grown by pulsed laser deposition using different SrO ratios, x. The effects of temperature and oxygen pressure during growth on the films’ structural properties were investigated. XRD results indicate that the film crystallinity was improved as the temperature and O2 pressure increased up to 650°C and 0.5 Torr, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 1; 211-216
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Different Processing Methods on the Behavior of Minerals Content in Food Products
    Autorzy:
    Alshallash, Khalid S.
    Shahat, Mohamed
    Ibrahim, Mohamed I.
    Hegazy, Ahmed I.
    Hamdy, Ashraf E.
    Elnaggar, Ibrahim A.
    El-Wahed, Abd El-Wahed N. Abd
    Taha, Ibrahim M.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201608.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    mineral
    fruit
    processing
    canning
    dehydration
    stewing
    Opis:
    The goal of the current study was to determine the mineral content of different fruit varieties (Na, K, Ca, P, Mg, Fe, Zn, and Cu), as well as the effects of various processing methods (such as canning, drying, stewing, syrup process, and concentration of juices). All tested fruits that were subjected to various types of processing were exposed to a degree of mineral loss, varying from very little to high reduction. However, it still retains its nutritional value. All fig products have the greatest levels of most tested minerals, compared to other processed fruit products, particularly P and Fe. In turn, orange products supply higher quantities of Ca. On the other hand, apricot products have a comparable value of other minerals with those found in fig and orange products. Among canned juices, guava had the highest contents of Ca, P, and Fe, while mango scored the first juice as Mg and Zn supplying. Canned apricot halves contain the best amounts of K, Ca, P and Mg than the same products of apple and peach. Among jam products, fig jam has higher amounts of Na, Ca, P, Mg, and Fe than those found in other fruit jams. The concentration of fruit juices by vacuum-heating or dehydration of fruit produced higher mineral retentions than the fruit products that were processed by other techniques. The concentrated orange juice by vacuum-heating processing retained most of the minerals found in raw juice, also dried apricot sheet retained higher minerals than those retained in dehydrated whole apricot.
    Źródło:
    Journal of Ecological Engineering; 2023, 24, 3; 263--275
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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