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    Wyświetlanie 1-4 z 4
    Tytuł:
    Microstructure and Phase Composition of the Ag-Al Film Wear Track: Through-Thickness Characterization by Advanced Electron Microscopy
    Autorzy:
    Kryshtal, O.
    Kruk, A.
    Mao, F.
    Taher, M.
    Jansson, U.
    Czyrska-Filemonowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/352230.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ag–Al alloy
    TEM
    EDX
    hexagonal phase
    electrical contact
    Opis:
    Analytical transmission electron microscopy has been applied to characterize the microstructure, phase and chemical composition of the Ag–Al wear track throughout its thickness down to the atomic level. Microscopy findings have been correlated with Ag–Al film tribological properties to understand the effect of the hexagonal solid solution phase on the tribological properties of this film. Ag–25Al (at.%) films have been produced by simultaneous magnetron sputtering of components in Ar atmosphere under 1 mTorr pressure and subjected to pin-on-disc tribological tests. It has been shown that hcp phase with (001) planes aligned parallel to the film surface dominates both in as-deposited and in tribofilm areas of the Ag–Al alloy film. Possible mechanisms of reduced friction in easily oxidized Ag–Al system are discussed and the mechanism based on readily shearing basal planes of the hcp phase is considered as the most probable one.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 251-256
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plants take action to mitigate salt stress: Ask microbe for help, phytohormones, and genetic approaches
    Autorzy:
    Hewedy, Omar A.
    Mahmoud, Ghada Abd-Elmonse
    Elshafey, Naglaa F.
    Khamis, Galal
    Karkour, Ali M.
    Abdel Lateif, Khalid S.
    Amin, Basma H.
    Chiab, Nour
    El-Taher, Ahmed M.
    Elsheery, Nabil I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174285.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    Bacillus
    ion homeostasis
    osmoprotectants
    osmotic stress
    photosynthesis
    ROS scavenging
    Opis:
    Global agriculture is a pivotal activity performed by various communities worldwide to produce essential human food needs. Plant productivity is limited by several factors, such as salinity, water scarcity, and heat stress. Salinity significantly causes short or long-term impacts on the plant photosynthesis mechanisms by reducing the photosynthetic rate of CO2 assimilation and limiting the stomatal conductance. Moreover, disturbing the plant water status imbalance causes plant growth inhibition. Up-regulation of several plant phytohormones occurs in response to increasing soil salt concentration. In addition, there are different physiological and biochemical mechanisms of salt tolerance, including ion transport, uptake, homeostasis, synthesis of antioxidant enzymes, and osmoprotectants. Besides that, microorganisms proved their ability to increase plant tolerance, Bacillus spp. represents the dominant bacteria of the rhizosphere zone, characterised as harmless microbes with extraordinary abilities to synthesise many chemical compounds to support plants in confronting salinity stress. In addition, applying arbuscular mycorrhizal fungi (AMF) is a promising method to decrease salinity-induced plant damage as it could enhance the growth rate relative to water content. In addition, there is a demand to search for new salt-tolerant crops with more yield and adaptation to unfavourable environmental conditions. The negative impact of salinity on plant growth and productivity, photosynthesis, stomatal conductance, and changes in plant phytohormones biosynthesis, including abscisic acid and salicylic acid, jasmonic acid, ethylene, cytokinins, gibberellins, and brassinosteroids was discussed in this review. The mechanisms evolved to adapt and/or survive the plants, including ion homeostasis, antioxidants, and osmoprotectants biosynthesis, and the microbial mitigate salt stress. In addition, there are modern approaches to apply innovative methods to modify plants to tolerate salinity, especially in the essential crops producing probable yield with a notable result for further optimisation and investigations.
    Źródło:
    Journal of Water and Land Development; 2022, 55; 1--16
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geotechnical evaluation of clayey soil contaminated with industrial wastewater
    Ocena geotechniczna gleby gliniastej zanieczyszczonej ściekami
    Autorzy:
    Karkush, M. O.
    Al-Taher, T. A. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/962334.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zanieczyszczenie gleby
    ścieki przemysłowe
    węglowodór ropopochodny
    gleba gliniasta
    właściwości geotechniczne
    soil contamination
    industrial wastewater
    petroleum hydrocarbon
    clayey soil
    geotechnical properties
    Opis:
    The impacts of industrial wastewater contamination on the geotechnical properties of clayey soil have been studied in the research presented in this paper. The contaminant in question is industrial wastewater released from Thi-Qar oil refinery as a by-product of production, and the soil samples obtained from Thi-Qar oil refinery plant in Al-Nassyriah (a city located in the south of Iraq). The geotechnical properties of contaminated soil samples were compared with those of intact soil to measure the effects of such a contaminant. The soil samples were obtained from three locations in the study area; representing the highly contaminated area, the slightly contaminated area, and the intact area used as a reference for comparison of test results. The results of the tests showed that the contaminant causes an increase of natural moisture content, field unit weight, Atterberg’s limits, and maximum dry unit weight, as well as an increase of the compression index and the coefficient of vertical consolidation. Also, the contaminant causes a decrease in specific gravity, the optimum moisture content initial void ratio, the swelling index, the coefficient of permeability, and cohesion between soil particles.
    Niniejsza praca została poświęcona badaniu wpływów zanieczyszczeń ściekami na właściwości geotechniczne próbek gleby gliniastej. Czynnikiem zanieczyszczającym są ścieki przemysłowe, uwalniane z rafinerii Thi-Qar jako produkty uboczne produkcji i wyrzucane bezpośrednio na glebę, powodując jej zanieczyszczenie. Ten produkt uboczny będzie dalej określany jako węglowodory ropopochodne (THP), w celu uniknięcia złożoności omawianych wpływów poszczególnych składników ścieków przemysłowych na właściwości geotechniczne gleby. Próbki gleby zostały pobrane z rafinerii Thi-Qar w mieście Al.-Nassyriah, położonym na południu Iraku, o współrzędnych geograficznych (N 305916.2, E 0461332.8). Zanieczyszczone i nierozłożone próbki gleby zostały pobrane w trzech miejscach na badanym obszarze oraz na trzech głębokościach w każdym z tych miejsc. W celu zbadania wpływu różnych stężeń węglowodorów ropopochodnych na właściwości geotechniczne gleby, przeprowadzono badanie trzech lokalizacji o bardzo zanieczyszczonym obszarze (NA1), nieznacznie zanieczyszczonym obszarze (NA2) oraz nienaruszonym obszarze (NA3).
    Źródło:
    Archives of Civil Engineering; 2017, 63, 1; 47-62
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, computational, anticancerous and antiproliferative effects of some copper, manganese and zinc complexes with ligands derived from symmetrical 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde
    Autorzy:
    Ababneh, Taher S.
    El-Khateeb, Mohammad
    Tanash, Aissar K.
    AL-Shboul, Tareq M.A.
    Shammout, Mohammad Jamal A.
    Jazzazi, Taghreed M.A.
    Alomari, Mohammad
    Daoud, Safa
    Talib, Wamidh H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849324.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    tetradentate schiff base
    symmetrical metal complexes
    DFT calculation
    spectroscopy
    anticancerous
    antiproliferative
    Opis:
    Four new symmetrical Schiff bases derived from 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl-salicylaldehyde have been synthesized and characterized by elemental analysis and different spectroscopic techniques. The reaction of 2,2’-diamino-4,4’-dimethyl-1,1’-biphenyl with two equivalents of 5-tert-butyl-, 3,5-dinitro-, 3,5-dibromo- and 3-tert-butyl-salicylaldehyde yielded 2,2’-bis(5-tert-butyl-salicylideneamino)-4,4’-dimethyl-1,1’-biphenyl (A1) as well as the 3,5-dinitro- (A2), 3,5-dibromo- (A3) and 3-tert-butyl- (A4) substituted derivatives. The tetradentate ligands were then reacted with copper-, manganese- and zinc-acetate producing the tetra-coordinate metal complexes which were characterized by FTIR, UV-Visible spectroscopy, magnetic susceptibility and elemental analysis. Zinc complexes were characterized by 1H-NMR spectroscopy. Density functional theory (DFT) calculations at the B3LYP/6-31G(d) level of theory were carried out to fully optimize and examine the molecular geometries of complexes. Subsequently, IR vibrational and UV-Vis absorption spectra were computed and correlated with the observed values and the results are in good agreement with the experimental data. The anticancerous and antiproliferative activity of the A3 ligand and its metal complexes were determined.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 1; 7-15
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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