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Search Results: 1 - 10 of 168000 matches for " Heidari E "
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Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
Moghiseh,E; Heidari,A;
Journal of soil science and plant nutrition , 2012, DOI: 10.4067/S0718-95162012005000028
Abstract: gypsiferous and saline soils are among the major soils of arid and semi-arid regions of the world. although numerous studies on salic, gypsic and petrogypsic horizons have been carried out, the co-occurrence of gypsum and halite and their morphological expression are still poorly documented. eight pedons located on a co-alluvial fan (bam area, southeast iran) were described, sampled and analyzed for physico-chemical and micromorphological characteristics based on standard methods. the highest amounts of gypsum (~ 60 %) comprising xenotopic gypsum and/or fibrous bassanite pseudomorph remaining behind after xenotopic gypsum dehydration were determined in the surface crust and in the underlying 2byz horizon. at a depth of 15 cm, a horizon cemented by gypsum and halite was observed. the highest amount of gypsum was determined at the upper part of this horizon followed by a sharp decreasing trend towards the lower depth. the amount of halite increases with increasing depth towards the bottom of 3byzm horizon. deeper, in the 5byz horizon the quantity of gypsum increases drastically and coarse elongated gypsum pendants dominate. micromorphological observations demonstrate that the dominant cementing agent is halite rather than gypsum. however, due to inexistence of petrosalic diagnostic horizon in keys to soil taxonomy, these soils are to be classified as petrogypsic haplosalids at subgroup level in soil taxonomy. in wrb taxonomy, they are classified as petrosalic solonchaks. co-occurrence of gypsum and halite in the same horizon, their specific layering and vertical distribution patterns in the studied pedons might be considered as indicators for polygenetic soils in this area.
Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
Moghiseh,E; Heidari,A;
Journal of soil science and plant nutrition , 2012, DOI: 10.4067/S0718-95162012005000028
Abstract: gypsiferous and saline soils are among the major soils of arid and semi-arid regions of the world. although numerous studies on salic, gypsic and petrogypsic horizons have been carried out, the co-occurrence of gypsum and halite and their morphological expression are still poorly documented. eight pedons located on a co-alluvial fan (bam area, southeast iran) were described, sampled and analyzed for physico-chemical and micromorphological characteristics based on standard methods. the highest amounts of gypsum (~ 60 %) comprising xenotopic gypsum and/or fibrous bassanite pseudomorph remaining behind after xenotopic gypsum dehydration were determined in the surface crust and in the underlying 2byz horizon. at a depth of 15 cm, a horizon cemented by gypsum and halite was observed. the highest amount of gypsum was determined at the upper part of this horizon followed by a sharp decreasing trend towards the lower depth. the amount of halite increases with increasing depth towards the bottom of 3byzm horizon. deeper, in the 5byz horizon the quantity of gypsum increases drastically and coarse elongated gypsum pendants dominate. micromorphological observations demonstrate that the dominant cementing agent is halite rather than gypsum. however, due to inexistence of petrosalic diagnostic horizon in keys to soil taxonomy, these soils are to be classified as petrogypsic haplosalids at subgroup level in soil taxonomy. in wrb taxonomy, they are classified as petrosalic solonchaks. co-occurrence of gypsum and halite in the same horizon, their specific layering and vertical distribution patterns in the studied pedons might be considered as indicators for polygenetic soils in this area.
Polygenetic saline gypsiferous soils of the Bam region, Southeast Iran
E Moghiseh,A Heidari
Journal of Soil Science and Plant Nutrition , 2012,
Abstract: Gypsiferous and saline soils are among the major soils of arid and semi-arid regions of the world. Although numerous studies on salic, gypsic and petrogypsic horizons have been carried out, the co-occurrence of gypsum and halite and their morphological expression are still poorly documented. Eight pedons located on a co-alluvial fan (Bam area, southeast Iran) were described, sampled and analyzed for physico-chemical and micromorphological characteristics based on standard methods. The highest amounts of gypsum (~ 60 %) comprising xenotopic gypsum and/or fibrous bassanite pseudomorph remaining behind after xenotopic gypsum dehydration were determined in the surface crust and in the underlying 2Byz horizon. At a depth of 15 cm, a horizon cemented by gypsum and halite was observed. The highest amount of gypsum was determined at the upper part of this horizon followed by a sharp decreasing trend towards the lower depth. The amount of halite increases with increasing depth towards the bottom of 3Byzm horizon. Deeper, in the 5Byz horizon the quantity of gypsum increases drastically and coarse elongated gypsum pendants dominate. Micromorphological observations demonstrate that the dominant cementing agent is halite rather than gypsum. However, due to inexistence of petrosalic diagnostic horizon in Keys to Soil Taxonomy, these soils are to be classified as Petrogypsic Haplosalids at subgroup level in Soil Taxonomy. In WRB Taxonomy, they are classified as Petrosalic Solonchaks. Co-occurrence of gypsum and halite in the same horizon, their specific layering and vertical distribution patterns in the studied pedons might be considered as indicators for polygenetic soils in this area.
Effect of Sodium Chloride on Lipoxygenase Activity, Hydrogen Peroxide Content and Lipid Peroxidation Rate in the Seedlings of Three Pistacia Rootstocks
M. Heidari,E. Tafazoli
Journal of Science and Technology of Agriculture and Natural Resources , 2005,
Abstract: One of the main criteria for salt tolerance is cell membrane stability under stress. Reactive oxygen species (ROS), activity of lipoxygenase (Lox) and lipid peroxidation are considered to be destructive to cell membrane under salt stress. In this study, the effects of 0, 75 and 150 mM NaCI, over a period of 14 days on the activity of lipoxygenease, the amount of hydrogen peroxide (H2O2) and malon dialdehyde (MDA. as a lipid peroxidation) in the leaves of Pistacia vera L. (cv. 'Qazvini' and wild 'Sarakhs' pistachio) and 'Mastic' (P. mutica F. & M.) were studied. The results indicated that by increasing salinity Lox activity increased in the leaves of all the three rootstocks. This activity reached a climax on the 7th day and then decreased on the 14th day. Among the three species, Mastic reached the highest amount of the Lox activity on the 14th day with the lowest amount of Lox reduction. The amounts of H2O2 in the leaves of all the three rootstocks increased, on the 14th day the highest amount of hydrogen peroxide was found in 'Mastic' and 'Sarakhs' after treating them with 150 mM NaCl. The amounts of MDA were also reached the highest level in all three rootstocks on the 7th and 14th days. The results also indicated the possibility of the use of lipid peroxidation index and Lox activity for selecting salt tolerant Pistacia rootstocks. More studies are needed for understanding the biochemical changes and enzyme activities in Pistacia rootstocks under salt stress.
Magnetic edge states in Aharonov-Bohm graphene quantum rings
R. Farghadan,A. Saffarzadeh,E. Heidari Semiromi
Physics , 2014, DOI: 10.1063/1.4842715
Abstract: The effect of electron-electron interaction on the electronic structure of Aharonov-Bohm (AB) graphene quantum rings (GQRs) is explored theoretically using the single-band tight-binding Hamiltonian and the mean-field Hubbard model. The electronic states and magnetic properties of hexagonal, triangular and circular GQRs with different sizes and zigzag edge terminations are studied. The results show that, although the AB oscillations in the all types of nanoring are affected by the interaction, the spin splitting in the AB oscillations strongly depends on the geometry and the size of graphene nanorings. We found that the total spin of hexagonal and circular rings is zero and therefore, no spin splitting can be observed in the AB oscillations. However, the non-zero magnetization of the triangular rings breaks the degeneracy between spin-up and spin-down electrons, which produces spin-polarized AB oscillations.
Local pressure of confined fluids inside nanoslit pores -- A density functional theory prediction
F. Heidari,G. A. Mansoori,E. Keshavarzi
Physics , 2013,
Abstract: In this work, the local pressure of fluids confined inside nanoslit pores is predicted within the framework of the density functional theory. The Euler-Lagrange equation in the density functional theory of statistical mechanics is used to obtain the force balance equation which leads to a general equation to predict the local normal component of the pressure tensor. Our approach yields a general equation for predicting the normal pressure of confined fluids and it satisfies the exact bulk thermodynamics equation when the pore width approaches infinity. As two basic examples, we report the solution of the general equation for hard-sphere (HS) and Lennard-Jones (LJ) fluids confined between two parallel-structureless hard walls. To do so, we use the modified fundamental measure theory (mFMT) to obtain the normal pressure for hard-sphere confined fluid and mFMT incorporated with the Rosenfeld perturbative DFT for the LJ fluid. Effects of different variables including pore width, bulk density and temperature on the behavior of normal pressure are studied and reported. Our predicted results show that in both HS and LJ cases the confined fluids normal pressure has an oscillatory behavior and the number of oscillations increases with bulk density and temperature. The oscillations also become broad and smooth with pore width at a constant temperature and bulk density. In comparison with the HS confined fluid, the values of normal pressure for the LJ confined fluid as well as its oscillations at all distances from the walls are less profound.
Legal System Governing on Water Pollution in Iran  [PDF]
Flora Heidari, Farhad Dabiri, Mehdi Heidari
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.59004
Abstract: In the present era, water contamination represents one of the considerable environmental problems. Population growth along with ever increasing industrial developments has resulted in the contamination of most of the water resources in the world, bringing about serious problems for humans and other living organisms. According to the human life on earth depends on the way different water resources are exploited, the most important way to preserve the quality of water resources is to codify appropriate regulations and standards and develop plans for proper and principled implementation of them. Therefore, it seems to be necessary to take required actions to manage water resources optimally. In this regard, one of the most significant legal tools is the law. Following a descriptive-analytic approach, the present research aims to consider legal challenges in the context of water contamination briefly. Investigations indicate that, given the limitations in water resources, in future, water contamination will raise serious problems for the country should the solutions and measures required for tackling this issue are not well incorporated into respective regulations. As such, in order to systemize the activities within this scope, it is necessary to codify a comprehensive act about different water-related topics, so as to cover all separate and sparse pieces of regulations on water. Further, acquiring help from experts when preparing the regulations with an emphasis on the inhibitory role of penalties, roles of NGOs and culture-making in the society will contribute to the successful legal protection of the quality of water resources.
The Computation of Scalar Curvature in the Four-State Mixed Spin Model and the Investigation of Its Behavior: A Computational Study  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.31005
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the authors’ name: Alireza Heidari, Foad Khademi,Jahromi and Roozbeh Amiri. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.4 334-339, 2012, has been removed from this site.
An Analytical and Numerical Approach to the Self-Consistent Method for Computing the Proportion of F2n/F2p Using the 3He and 3H Nucleuses’ Structure Function and EMC Ratio  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.31017
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the author’s name: Alireza Heidari. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.1 124-128, 2012, has been removed from this site.
New Approach to Simulating the Absorption of Gamma Radiations Using the Monte-Carlo Method: A Computational Study  [PDF]
Alireza Heidari, Mohammadali Ghorbani
Journal of Modern Physics (JMP) , 2012, DOI: 10.4236/jmp.2012.33035
Abstract: The following article has been retracted due to the investigation of complaints received against it. Mr. Mohammadali Ghorbani (corresponding author and also the last author) cheated the author’s name: Alireza Heidari. The scientific community takes a very strong view on this matter and we treat all unethical behavior such as plagiarism seriously. This paper published in Vol.3 No.3, 260-265, 2012, has been removed from this site.
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