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Wyszukujesz frazę "Mokhtari, M." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effects of the composite stacking sequence on the failure load of the single lap bonded joint
    Autorzy:
    Mokhtari, M.
    Madani, A.
    Benzaama, H.
    Malarino, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/280931.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    Virtual Crack Closure Technique (VCCT)
    laminate sequence
    single lap joint
    bonding defect
    Opis:
    Composite materials are widely used in aircraft structures, their relative rigidity/weight confers their advantage over metal structures, and the stacking sequence plays an important role for their use. The objective of this work is to analyze by the finite element method the mechanical behavior of a single lap joint of composite/composite type under a tensile load. In order to see the effects on the failure load, two basic parameters are taken into consideration; the stacking sequence of composite and thickness of each layer constituting the composite. Calculation of the failure load is made numerically with the ABAQUS code using the developed technique of VCCT (Virtual Crack Closure Technique) based on fracture mechanics. Finally, the influence of the bonding defect on the failure load is analyzed. The results clearly show the importance of optimizing fiber orientation and hence the stacking sequence for proper use of composite in bonded assemblies.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1257-1268
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A critical review on soil ionisation modelling for grounding electrodes
    Autorzy:
    Mokhtari, M.
    Abdul-Malek, Z.
    Gharehpetian, G.B.
    Powiązania:
    https://bibliotekanauki.pl/articles/950672.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    grounding electrodes
    grounding electrode resistance
    soil ionisation modelling
    Opis:
    Grounding electrode resistance non-linearly changes under impulse conditions due to soil ionisation phenomenon. Several models have been proposed to model soil ionisation for grounding electrodes applications. However, to date, there is yet an attempt made to compile all these works into a comprehensive review article. Therefore, this paper is written with the objective of summarizing all related works in this field as a one– stop reference. With reference to the literature, this paper is written to summarize the working principles of the soil ionisation models as well as the accuracy and performance analysis of the models. This paper, particularly highlights the deficiencies of the available models in terms of accuracy and performance. This knowledge will contribute to the development of a new accurate and efficient soil ionisation model.
    Źródło:
    Archives of Electrical Engineering; 2016, 65, 3; 449-461
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new automated stretching finite element method for 2D crack propagation
    Autorzy:
    Bentahar, M.
    Benzaama, H.
    Bentoumi, M.
    Mokhtari, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/279776.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    2D crack propagation
    FEM
    stretching finite element method (SFEM)
    stress intensity factor (SIF)
    Opis:
    This work presents a study of crack propagation with a new 2D finite element method with the stretching of the mesh. This method affects at each propagation step new coordinates of each element node of the mesh. The structure is divided to areas and each area has its own coordinate formulas. A program in FORTRAN allows us to create a parametric mesh, which keeps the same number of nodes and elements during different steps of crack propagation. The nodes are stretched using the criterion of maximum circumferential stress (MCS). The fracture parameters such as stress intensity factors in modes I and II and the orientation angles are calculated by solving the problem by the finite element code ABAQUS.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2017, 55, 3; 869-881
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Callus induction and plant regeneration of Valeriana officinalis are affected by different leaf explants and various concentrations of plant growth regulators
    Autorzy:
    Zamini, A.
    Mokhtari, A.
    Tansaz, M.
    Zarei, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/79986.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2016, 97, 4
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interactive effects of plant growth regulators and explants on direct shoot regeneration of Viola odorata
    Autorzy:
    Mokhtari, A.
    Zarei, M.
    Samsamzadeh, B.
    Moradi, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/80603.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2016, 97, 1
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A New Model for a Frequency-Dependent Non-Linear Reactor
    Autorzy:
    Mokhtari, H.
    Ghodsinya, S. R. M.
    Rajabi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/262610.pdf
    Data publikacji:
    2009
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
    Tematy:
    frequency-dependent
    inductors
    harmonic
    power quality
    Opis:
    Increase of power electronic devices has resulted in current/voltage harmonic pollution in power systems. Harmonics have adverse effects on equipment with magnetic materials. This paper investigates effects of harmonics on inductors and proposes a new model for a non-linear frequency-dependent inductor. Tbe study is based on experiments in which inductors are subjected to sinusoidal inputs at different frequencies. The accuracy of the proposed formula is also investigated.
    Źródło:
    Electrical Power Quality and Utilisation. Journal; 2009, 15, 1; 15-18
    1896-4672
    Pojawia się w:
    Electrical Power Quality and Utilisation. Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Revising the Metacognitive Awareness of Reading Strategies Inventory (MARSI) and testing for factorial invariance
    Autorzy:
    Mokhtari, Kouider
    Dimitrov, Dimiter M.
    Reichard, Carla A.
    Powiązania:
    https://bibliotekanauki.pl/articles/780595.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    metacognition
    reading comprehension
    metacognitive awareness
    reading strategies
    Opis:
    In this study, we revised the Metacognitive Awareness of Reading Strategies Inventory (MARSI), a self-report instrument designed to assess students’ awareness of reading strategies when reading school-related materials. We collected evidence of structural, generalizability, and external aspects of validity for the revised inventory (MARSI-R). We first conducted a confirmatory factor analysis of the MARSI instrument, which resulted in the reduction of the number of strategy statements from 30 to 15. We then tested MARSI-R for factorial invariance across gender and ethnic groups and found that there is a uniformity in student interpretation of the reading strategy statements across these groups, thus allowing for their comparison on levels of metacognitive processing skills. We found evidence of the external validity aspect of MARSI-R data through correlations of such data with a measure of the students’ perceived reading ability. Given that this journal is oriented to second language learning and teaching, our article also includes comments on the Survey of Reading Strategies (SORS), which was based on the original MARSI and was designed to assess adolescents’ and adults’ metacognitive awareness and perceived use of ESL reading strategies. We provide a copy of the MARSI-R instrument and discuss the implications of the study’s findings in light of new and emerging insights relative to assessing students’ metacognitive awareness and perceived use of reading strategies.
    Źródło:
    Studies in Second Language Learning and Teaching; 2018, 8, 2; 219-246
    2083-5205
    2084-1965
    Pojawia się w:
    Studies in Second Language Learning and Teaching
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cyclotron production of 68Ga via proton-induced reaction on 68Zn target
    Autorzy:
    Sadeghi, M.
    Kakavand, T.
    Rajabifar, S.
    Mokhtari, L.
    Rahimi-Nezhad, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146448.pdf
    Data publikacji:
    2009
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    production
    gallium-68
    zinc-68
    PET
    cyclotron
    Opis:
    68Ga is an important positron-emitting radionuclide for positron emission tomography. In this work 68Ga was produced via the 68Zn(p,n)68Ga nuclear reaction. 68Zn electrodeposition on a copper substrate was carried out by alkaline cyanide baths. 68Zn target was irradiated with a 15 MeV proton beam and a 150 mi A current. The production yield achieved was 136 mCi/ mi Aźh (5.032 GBq/mi Aźh). 68Ga was separated from zinc and copper by a combination of cation exchange chromatography and liquid-liquid extraction methods.
    Źródło:
    Nukleonika; 2009, 54, 1; 25-28
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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