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


Wyświetlanie 1-3 z 3
Tytuł:
Impact of marble powder amendment on hydraulic properties of a sandy soil
Autorzy:
Farhadi-Machekposhti, M.
Valdes-Abellan, J.
Pla, C.
Benavente, D.
Pachepsky, Y.
Powiązania:
https://bibliotekanauki.pl/articles/2082885.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
saturated hydraulic conductivity
soil water
retention curve
field capacity
plant available water
pore size
distribution
Opis:
Marble powder is one of carbonate rock amendments that is used to improve soil reaction. We hypothesized that the powdered marble addition can cause favorable changes in hydraulic properties of sandy soils. Six levels of marble powder addition to an aridisol soil (0%; M0; 5%; M5; 10%; M10; 15%; M15; 20%; M20 and 25%, M25; by bulk volume) were analyzed in triplicate. The saturated hydraulic conductivity and soil water retention curves were obtained. Pore space properties were investigated using soil water retention curves, mercury intrusion porosimetry and scanning electron microscopy. The saturated hydraulic conductivity significantly decreased (between 83 and 97% for M5 and M25 respectively) and parameters α and n of the van Genuchten model significantly decreased in marble-amended soils. Both field capacity and permanent wilting point increased with the addition of marble powder. Plant-available water, increased significantly until 10% of marble powder application; higher percentages of application did not provide additional significant changes in the plant-available water. Pore space distributions from soil water retention curves parameters showed an increase in the pore size range and a decrease in the average pore size; pore space distribution from the scanning electron microscopy also showed the presence of a new family of dominant pore sizes which was not detected by the soil water retention curves parameters approach. It was concluded that the addition of marble powder can improve the ability of soil to store water providing an advantage for irrigation water management in water scarce environments. Further research will have to address the impact of marble powder amendment under field semi-arid conditions.
Źródło:
International Agrophysics; 2020, 34, 2; 223-232
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lattice Boltzmann simulation of natural convection flow around a horizontal cylinder located beneath an insulation plate
Autorzy:
Mehrizi, A. A.
Farhadi, M.
Afrouzi, H. H.
Shayamehr, S.
Lotfizadeh, H.
Powiązania:
https://bibliotekanauki.pl/articles/949135.pdf
Data publikacji:
2013
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
free convection
isothermal cylinder
Lattice Boltzmann method (LBM)
Opis:
In this paper, two-dimensional heat transfer solution of natural convection around an isothermal cylinder located beneath an insulation wall is studied. The effects of distance ratio of the cylinder to the wall as well as the impact of the dimensionless Rayleigh number in the flow and heat transfer are taken into account. Solving the flow equations for L/D ratio with values 0.5, 0.7, and 1.5 and the Rayleigh number ranging from 1000 to 40000 is carried out. The results are compared with the experimental data which present a good agreement. The results indicate that the effect of weakened natural convection flow in the cylinder commences when decreasing L/D ratio from the value 1.5 to 0.5 leading to a decline in heat transfer and the Nusselt number. This process occurs in all values of the Rayleigh number. For the ratio number greater than 1.5, the impact of adiabatic wall is neglected, and there is no significant influence on the natural convection flow. Increasing the angle from 0◦to180◦results in a fall in the Nusselt number which is as a consequence of growth in the distances of isothermal lines.
Źródło:
Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 729-739
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and Characterization of ZnO Nanostructures by Polymeric Precursor Route
Autorzy:
Razavi, R.
Loghman-Estarki, M.
Farhadi-Khouzani, M.
Powiązania:
https://bibliotekanauki.pl/articles/1490862.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.-n
Opis:
Zinc oxide nano- and submicrostructures have been synthesized controllably by polymeric precursor method (Pechini). In this approach, zinc acetate $Zn(CH_3COO^{-})_2 \cdot 2H_2O$, citric acid and ethylene glycol were used as the source of $Zn^{2+}$, the chelating agent and the connecting agent, respectively. The microstructure of the ZnO nano- and submicrostructures was characterized by X-ray diffractometry and scanning electron microscopy and the optical property was investigated by the room temperature photoluminescence spectra. The effect of ethylene glycol to citric acid mole ratio on the morphology and structure of the products was discussed.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 98-100
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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