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Wyszukujesz frazę "Taheri, A." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Numerical modeling of gas flow in coal pores for methane drainage
    Autorzy:
    Taheri, A.
    Sereshki, F.
    Ardejani, F. D.
    Mirzaghorbanali, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/970686.pdf
    Data publikacji:
    2016
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    coal mining
    methane drainage
    gas flow
    numerical simulation
    górnictwo węgla
    odmetanowanie
    przepływ gazu
    symulacja numeryczna
    Opis:
    The sudden explosion of methane during underground coal mining is a major dilemma. To mitigate its occurrence and reduce the extent of methane diffusion, gas drainage operations are carried out before mining. This paper investigates methane gas flow in a coal block in order to calculate the pressure of gas and its molecule velocity for methane gas drainage operation. A coal piece surrounded by cleats was used for geometrical modeling and numerical simulation. Movements of fluid and gas molecules in a porous mediumwere successfully simulated. The numerical solution is based on COMSOL Multiphysics software. The validity of the numerical simulation was assessed using an analytical model with satisfactory results.
    Źródło:
    Journal of Sustainable Mining; 2016, 15, 3; 95-99
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geochemistry of siliciclastic rocks from the Shemshak Group (Upper Triassic-Middle Jurassic), northeastern Alborz, northern Iran : implications for palaeoweathering, provenance, and tectonic setting
    Autorzy:
    Taheri, A.
    Jafarzadeh, M.
    Armstrong-Altrin, J. S.
    Mirbagheri, S. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060454.pdf
    Data publikacji:
    2018
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Shemshak Group
    geochemistry
    provenance
    palaeoweathering
    tectonic setting
    Neotethys
    Opis:
    Combined petrographic and geochemical data of the siliciclastic sedimentary rocks from the Shemshak Group in the northeastern Alborz Mountains, north of Iran are described, together with their implications for palaeoweathering, their provenance, and tectonic setting. Based on field observations and modal composition, the sandstones are classified as litharenites. The chemical index of alteration (CIA) indicated that the source terrains underwent a moderate intensity of chemical weathering. The index of chemical variation (ICV) values indicated that the Shemshak Group rocks were immature and related to a source area with an active tectonic regime. Major, trace and rare earth element (REE) data suggested the domination of mixed sedimentary (recycled) and igneous rocks in the source area of the Shemshak Group. Petrographic and geochemical characteristics of Shemshak Group rocks suggest an active continental margin (ACM), which corresponds to the collision of the Iran plate with the Turan plate.
    Źródło:
    Geological Quarterly; 2018, 62, 3; 522--535
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical and mechanical properties of hemp seed
    Autorzy:
    Taheri-Garavand, A.
    Nassiri, A.
    Gharibzahedi, S.M.T.
    Powiązania:
    https://bibliotekanauki.pl/articles/24904.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Opis:
    The current study was conducted to investigate the effect of moisture content on the post-harvest physical and mechanical properties of hemp seed in the range of 5.39 to 27.12% d.b. Results showed that the effect of moisture content on the most physical properties of the grain was significant (P<0.05). The results of mechanical tests demonstrated that the effect of loading rate on the mechanical properties of hemp seed was not significant. However, the moisture content effect on rupture force and energy was significant (P<0.01).The lowest value of rupture force was obtained at the highest loading rate (3mm min-1)and in the moisture content of 27.12% d.b. Moreover, the interaction effects of loading rate and moisture content on the rupture force and energy of hemp seed were significant (P<0.05).
    Źródło:
    International Agrophysics; 2012, 26, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical properties of safflower stalk
    Autorzy:
    Shahbazi, F.
    Nazari Galedar, M.
    Taheri-Garavand, A.
    Mohtasebi, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/24924.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    safflower
    Young's modulus
    bending stress
    mechanical property
    moisture content
    physical property
    safflower stalk
    shearing stress
    specific shearing energy
    stalk
    Źródło:
    International Agrophysics; 2011, 25, 3
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and numerical investigation of friction coefficient effects on defects in horizontal tube bending process
    Autorzy:
    Taheri Kahnamouei, J.
    Fattahi, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/279854.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    tube bending
    wrinkle
    simulation
    friction
    wall thickness change
    Opis:
    The aim of this paper is to investigate defects in a thin-walled tube bending process (without using mandrel and booster) and effects of friction between the dies and tube on wrinkles. In the tube bending process, there are several effective parameters such as wall thickness, outer diameter-to-wall thickness ratio, centerline bending radius-to-outer diameter ratio and friction coefficient. Any mismatch in the selection of the process parameters would cause defects inducing undesirable variations in wall thickness and cross-section distortion. In this work, firstly, tubes with several wall thickness values are bent, and the final depths of wrinkling and wall thickness change are reviewed. Then, to study the process numerically, numerical simulations are carried out. Then, a series of experimental tests are carried out to verify the simulation results. A comparison between numerical and experimental results shows a reasonable agreement. Finally, in order to obtain a suitable friction condition, the effects of friction coefficients on defects are studied. For this purpose, a series of simulations has been carried out. It shows that at a certain friction coefficient, a minimum wrinkling depth can be observed and variations in the friction coefficient between the dies and tube has no effective influence on wall thinning and thickening.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2015, 53, 4; 837-846
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanocrystalline Nickel Oxide (NiO) Thin Films Grown on Quartz Substrates: Influence Of Annealing Temperatures
    Autorzy:
    Hajakbari, F.
    Taheri Afzali, M.
    Hojabri, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033487.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Tv
    81.07.Bc
    81.15.cd
    Opis:
    In the present investigation, nanocrystalline NiO thin films were prepared by thermal oxidation annealing of DC magnetron sputtered Ni thin films on quartz substrates. The effect of annealing temperature on the films structural, morphological and optical properties was investigated. The XRD analysis shows that all prepared films were of NiO with cubic structure and (200) orientation. The thickness of NiO films was in range of 40-100 nm. The average crystallite size is found to increase from 16 to 36 nm and the optical band gap energy decreases from 3.62 to 3.38 eV by increasing the annealing temperature from 400°C to 600°C. The AFM and SEM results show that the annealing temperature effectively influences the surface morphology of the films.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 417-419
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Genetic diversity and taxonomic studies of Allium akaka and A. elburzense native to Iran using morphological characters
    Autorzy:
    Jafari, S.
    Hassandokht, M.R.
    Taheri, M.
    Kashi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1851.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Ogrodnictwa
    Źródło:
    Journal of Horticultural Research; 2017, 25, 1
    2300-5009
    Pojawia się w:
    Journal of Horticultural Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes in fruit yield and photosynthesis parameters in different olive cultivars (Olea europaea L.) under contrasting water regimes
    Autorzy:
    Golmohammadi, M.
    Sofalian, O.
    Taheri, M.
    Ghanbari, A.
    Rasoli, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/12714532.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Przyrodniczy w Lublinie. Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie
    Opis:
    The evergreen tree olive (Olea europaea L.) is the only species of the genus Olea that produces edible fruits with high ecological and economic value. This tree species has developed a series of physiochemical mechanisms to tolerate drought stress and grow under adverse climatic environments. One of these mechanisms is photosynthesis activities, so that as yet little information achieved about the relations between olive production and photosynthetic parameters under drought conditions. An experiment was carried out during two consecutive years (2015–2017) to study the response of 20 different olive tree cultivars (Olea europaea L.) to drought stress. Several parameters like net photosynthetic rate (PN), stomatal conductance (GS), transpiration rate (TE), photosynthetic pigments (total chlorophyll, chlorophyll a, b and carotenoid) and fruit yield were measured. The results of combined analysis of variance for fruit yield and other measured traits showed that year, drought treatment, cultivar main effects and their interactions were highly significant. The results indicated that drought stress reduced all traits, however GS (42.80%), PN (37.21%) and TE (37.17%) significantly affected by drought. Lower reduction in photosynthetic performance (PN, GS and TE) in the cultivar T7 compared to other olive cultivars allowed them to maintain better fruit yield. Principal component analysis (PCA) identified two PCs that accounted for 82.04 and 83.27% of the total variation in photosynthetic parameters under optimal and drought stress conditions, respectively. Taken together, mean comparison, relative changes due to drought and biplot analysis revealed that cultivars ‘T7’, ‘Roghani’, ‘Koroneiki’, ‘Korfolia’ and ‘Abou-satl’ displayed better response against drought stress. According to our results, one olive cultivar namely ‘T7’, could be used in olive breeding programs to improve new high yielding cultivars with drought tolerance for use in the drought-prone environments.
    Źródło:
    Acta Scientiarum Polonorum. Hortorum Cultus; 2020, 19, 3; 135-147
    1644-0692
    Pojawia się w:
    Acta Scientiarum Polonorum. Hortorum Cultus
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of external wedge on the photoneutron dose equivalent at a high energy medical linac
    Autorzy:
    Hashemi, , S. M.
    Raisali, G.
    Taheri, M.
    Majdabadi, A.
    Ghafoori, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147071.pdf
    Data publikacji:
    2011
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    photoneutron
    linac
    polycarbonate (PC)
    external wedge
    radiotherapy
    Opis:
    Medical linacs used in radiotherapy produce bremsstrahlung spectra. In the energy range from 8 to 25 MV medical linacs produce, besides the clinically useful electron and photon beams, secondary neutrons. The aim of this study was to investigate the effect of an external wedge filter on the photoneutron dose equivalent produced by a medical linac at patient plane. Polycarbonate (PC) films were used for the determination of photoneutron dose equivalent produced by a Varian 2100 C/D linac working at 18 MV photon mode. Neutron dose equivalent was measured at distances 0, 10, 20 and 50 cm from the center of the X-ray beam for open field and after inserting a wedge filter. It was noted that by inserting the external wedge in the path of the X-ray beam, the photoneutron dose equivalent was increased compared to open field. It can be concluded that an external wedge, made from heavy materials may act like the other components of linac head, producing undesired photoneutrons and thus increasing patient dose.
    Źródło:
    Nukleonika; 2011, 56, 1; 49-51
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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