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Wyszukujesz frazę "Tounsi, M.S." wg kryterium: Autor

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Phytochemical characterisation and bioactive properties of Solanum sodomaeum L. fruits at two stages of maturation
    Autorzy:
    Ouerghemmi, I.
    Farhat, M.B.
    Harbeoui, H.
    Hammami, M.
    Hamdaoui, G.
    Marzouk, B.
    Tounsi, M.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/71442.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Tematy:
    phytochemistry
    bioactive property
    antibacterial property
    antioxidant activity
    essential oil
    fatty acid
    Solanum sodomaeum
    fruit
    maturation
    Opis:
    Introduction: Solanum sodomaeum L. has been observed to have several medicinal properties, in particular, in the treatment of several types of human skin cancer. Objective: The influence of the maturation stage of S. sodomaeum fruits on the total lipid contents, fatty acid profiles, essential oil yields and compositions, as well as the antibacterial and antioxidant activities of the essential oils, was investigated. Methods: The fatty acid and essential oil constituents were identified using gas chromatography (GC) and GC–mass spectrometry (GC–MS). The antioxidant properties of essential oil and vegetal oil were assessed using 1,1-diphenyl-2-picryl-hydrazyl (DPPH) scavenging and reducing power assays. The antibacterial ac-tivity of essential oil was tested using the disc diffusion assay for resistance in human pathogenic bacteria. Results: Mature fruits showed higher total lipid content (17%) and were characterised by polyunsaturated fatty acids (53.87%), represented mainly by linoleic acid (53.11%). Similar yields of essential oils were detected for immature (0.43%) and mature (0.45%) fruits. Tetrahydronaphthalene (41.79%) was detected as the major essential oil component at the immature stage versus dihydrocoumarin pentane (18.27%), hexadecanoic acid (17.43%) and 2-undecanone (13.20%) in mature fruits. The DPPH test showed that essential oils had better antioxidant properties; however, the vegetal oils showed better performance in the reducing power assay. Moreover, the essential oil of S. sodomaeum mature fruits was active against bacterial strains. Conclusions: S. sodomaeum fruits could be a valuable source of natural antioxidants and antibacterial agents.
    Źródło:
    Herba Polonica; 2018, 64, 3
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Inverse method for a one-stage spur gear diagnosis
    Autorzy:
    Akrout, A.
    Tounsi, D.
    Taktak, M.
    Abbes, M. S.
    Haddar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/949292.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Independent Component Analysis (ICA)
    source identification
    gear mechanism
    geometrical defects
    Opis:
    In this paper, a source separation approach based on the Blind Source Separation (BSS) is presented. In fact, the Independent Component Analysis (ICA), which is the main technique of BSS, consists in extracting different source signals from several observed mixtures. This inverse method is very useful in many fields such as telecommunication, signal processing and biomedicine. It is also very attractive for diagnosis of mechanical systems such as rotating machines. Generally, dynamic responses of a given mechanical system (displacements, accelerations and speeds) measured through sensors are used as inputs for the identification of internal defaults. In this study, the ICA concept is applied to the diagnosis of a one-stage gear mechanism in which two types of defects (the eccentricity error and the localized tooth defect)are introduced. The finite element method allows determination of the signals corresponding to the acceleration in some locations of the system, and those signals may be used also in the ICA algorithm. Hence, the vibratory signatures of each defect can be identified by the ICA concept. Thus, a good agreement is obtained by comparing the expected default signatures to those achieved by the developed inverse method.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 3; 617-628
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of camshaft eccentricity and follower backlash on the dynamic behaviour flexible cam mechanism
    Autorzy:
    Tounsi, M.
    Chaari, F.
    Abbes, M. S.
    Fakhfakh, A. T.
    Haddar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/329630.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    wał rozrządu
    charakterystyka dynamiczna
    symulacja
    cam
    follower
    dynamic response simulation
    camshaft eccentricity
    follower backlash
    Opis:
    A cam follower system is modelled in this work. The equation of motion and the eigenfrequencies are recovered. The computation of the dynamic response is made by mean of combined implicit Newmark-Newton Raphson algorithm. Moreover, dynamic behaviour of the follower train is analysed in presence of an eccentricity in the camshaft and backlash between the follower rods and its guide.
    Źródło:
    Diagnostyka; 2010, 2(54); 3-9
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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