Ontogenetic Changes in Vulnerability of the Prawn <Emphasis Type="Italic">Fenneropenaeus indicus</Emphasis> to UV-B Radiation Help Explain Ontogenetic Habitat Shifts     

Gopikrishna?Mantha  Ali?M.?Al-Aidaroos  Mohsen?M.?O.?El-Sherbiny  Sathianeson?Satheesh  Sambhu?Chithambaran  Carlos?M.?DuarteEmail author 《Estuaries and Coasts》2016,39(3):839-845

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Estimation of the Rock Load in Non-squeezing Ground Condition Using the Post Failure Properties of Rock Mass     

Mohsen Soleiman Dehkordi  H. A. Lazemi  K. Shahriar  Masoud Soleiman Dehkordi 《Geotechnical and Geological Engineering》2015,33(4):1115-1128

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Kinematic and dynamic analysis of North-Tehran tectonic wedge formed in south central Alborz, Iran     

Sareh Rajabi  Mohsen Eliassi 《Journal of the Geological Society of India》2012,80(5):731-737

To answer the question ??Whether the North-Tehran tectonic wedge is a dynamic tectonic wedge or not??? we applied paleostress techniques to investigate fault slip data. The mean reduced stress tensor is defined for all stabilized stress regions. Unscaled Mohr??s circles drawn for fault slip data were used to obtain the relative slip tendency of clusters on diagrams. It showed that the slip tendency in the vicinity of fault junction is much lower than expected. The mean??₁ defined for a combination of fault slip data trends N14°E nearly parallel with the overall pressure in Iranian crust at the latitude of Central Alborz. This trend suggests the least effect of boundary faults and the wedge between them on stress orientations inside the wedge. Finally, the stress trajectory map was prepared showing the configuration and relative intensity of ??₁. The map did not illustrate any convergence in ??₁ trajectories and the consequent concentration of stress and seismic potential in fault junction. That is a direct evidence for disagreeing the dynamicity of this tectonic wedge.  相似文献   

Statistic and genetic investigation of faults in North Tehran tectonic wedge (South Central Alborz)     

Sareh Rajabi  Mohsen Eliassi  Abdollah Saidi 《Arabian Journal of Geosciences》2012,5(6):1269-1277

In this research, we have focused on the geometrical characteristics of young faults in North Tehran tectonic wedge which is confined with the Mosha and North Tehran faults, the most outstanding active faults in Alborz fold-thrust belt. The statistical, genetic, and kinematic relationships between internal faults, boundary faults, and the stress regime in the area (at the finite state of deformation path) are considered in detail with the help of rose diagrams and Riedel??s model. On this basis, all faults with diverse mechanisms have been classified into different Riedel fractures and their orders of formation are identified. Pattern of faults implies a more or less N?CS compression at the period of faulting. Consideration of geometry and tectonic setting of abundant normal faults have led to propose folding and listric faulting model to explain the origin of normal faults in a compressional tectonic region. These structural models represent the mechanism of normal faulting in response to compression in crustal and upper crustal scales, respectively.  相似文献   

Multicomponent theory of buoyancy instabilities in magnetized plasmas: the case of magnetic field parallel to gravity     

A.?K.?NekrasovEmail author  Mohsen?Shadmehri 《Astrophysics and Space Science》2011,333(2):477-490

We investigate electromagnetic buoyancy instabilities of the electron-ion plasma with the heat flux based on not the magnetohydrodynamic (MHD) equations, but using the multicomponent plasma approach when the momentum equations are solved for each species. We consider a geometry in which the background magnetic field, gravity, and stratification are directed along one axis. The nonzero background electron thermal flux is taken into account. Collisions between electrons and ions are included in the momentum equations. No simplifications usual for the one-fluid MHD-approach in studying these instabilities are used. We derive a simple dispersion relation, which shows that the thermal flux perturbation generally stabilizes an instability for the geometry under consideration. This result contradicts to conclusion obtained in the MHD-approach. We show that the reason of this contradiction is the simplified assumptions used in the MHD analysis of buoyancy instabilities and the role of the longitudinal electric field perturbation which is not captured by the ideal MHD equations. Our dispersion relation also shows that the medium with the electron thermal flux can be unstable, if the temperature gradients of ions and electrons have the opposite signs. The results obtained can be applied to the weakly collisional magnetized plasma objects in laboratory and astrophysics.  相似文献   

Application of ASTER and Landsat TM Data for Geological Mapping of Esfandagheh Ophiolite Complex,Southern Iran     

Mohsen Pournamdari  Mazlan Hashim  Amin Beiranvand Pour 《Resource Geology》2014,64(3):233-246

This research developed an approach to enable the discrimination of lithological units and detection of host rock of chromitite bodies within ophiolitic complexes using the advanced spaceborne thermal emission and reflection radiometer (ASTER) and Landsat thematic mapper (TM) satellite data. Three main ophiolite complexes located in southern Iran were selected for the study. A specialized band ratio (4/1, 4/5, 4/7) of ASTER, minimum noise fraction (MNF) components and spectral angle mapper (SAM) on ASTER and Landsat TM data were used to distinguish ophiolitic rock units. Results show that the specialized band ratio was able to identify different rock units and serpentinized dunite as host rock of chromitites within ophiolitic complexes. Minimum noise fraction components of ASTER and Landsat TM data are suitable for distinguishing ophiolitic rock complexes at a regional scale. The integration of SAM and feature level fusion used in this investigation discriminated the ophiolitic rock units and provided geological map for the study area, including identification of high potential areas (serpentinite dunite) for chromite exploration targets.  相似文献   

Water use at Luxor,Egypt: consumption analysis and future demand forecasting     

Ayman A. Ahmed  Graham E. Fogg  Mohsen A. Gameh 《Environmental Earth Sciences》2014,72(4):1041-1053

Water resources in Egypt are becoming scarce and the demand for clean drinking water supply is one of the most important priorities of the Egyptian government in recent years. Analyzing water use and future demand forecasting is a primitive clue for water demand management. Water in Luxor is used for agricultural, residential, institutional, commercial, and touristic purposes. The results of water use analysis indicated that for the time period from 1983 to 2012, agriculture is the highest consumer of water which reached about 94.76–97.38 % followed by residential water consumption (1.90–3.05 %), institutional water consumption (0.71–1.75 %), and touristic water consumption (0.02–0.43 %), respectively. The future demand forecasting results revealed that the present situation may continue to rise in the next 50 years which will increase the water demand with a water deficit ranging between 15 and 114 MCM/year. To fill the gap between the present water consumption and future residential, institutional, commercial, and touristic water demand, additional municipal facilities, and improvement and management of water supply/demand are needed. To cope with the predicted future water demand, it is recommended to improve the on-farm irrigation, reduce the demand for irrigation water, rationalize the irrigation water use, and enhance the integrated role of water users in integrated water resources management.  相似文献   

The effects of hydrometer reading times on the spatial variability of soil textures in southeast Iran     

Alireza Owji  Isa Esfandiarpour Boroujeni  Ardavan Kamali  Seyed Javad Hosseinifard  Mohsen Bagheri Bodaghabadi 《Arabian Journal of Geosciences》2014,7(4):1491-1499

Soil texture is an important physical soil property that may contribute to variations in many soil functions as well as nutrient storage and availability, water retention, and soil erosion. Although several methods for determining the texture classes of soil particles have been proposed, differences among hydrometer reading times have presented challenges in determining the precise soil texture classes. Therefore, this study was conducted to evaluate the effects of hydrometer reading time on the spatial variability of soil textures in the Rafsanjan area, southeast Iran. To accomplish this, 77 soil samples were collected on a 500-m square sampling grid from depths of 0–40, 40–80, and 80–120 cm, and their particle sizes were determined through analysis for 40 s, 2 h, 6.5 h, and 8 h using the Bouyoucos hydrometer method. The results showed a strong spatial correlation in the soil particles among sampling soil layers and across the study area. Moreover, the differences among hydrometer reading times did not have a significant impact on determination of coarse soil texture classes, although they did influence determination of the finer classes. Although the 8 h reading time provided the most accurate response with respect to mechanical analysis of a soil, after 6.5 h the hydrometer could also largely (more than 80.0 %, on average) achieve this goal. Additionally, the 2 h hydrometer reading time could also be useful for the initial assessment or general overview of the soil texture in a certain region; however, it is not recommended for precision agriculture or site-specific management.  相似文献   

Source parameters estimation of 2003 Bam earthquake Mw 6.5 using empirical Green’s function method,based on an evolutionary approach     

Ahmad Nicknam  Reza Abbasnia  Yasser Eslamian  Mohsen Bozorgnasab  Ehsan Adeli Mosabbeb 《Journal of Earth System Science》2010,119(3):383-396

We determine the source parameters for 2003 (Mw 6.5) Bam, Iran, earthquake using an empirical Green’s function summation approach to model ground motions recorded by two strong motion stations at approximately 45 km epicentral distance. We introduce a genetic algorithm technique to optimize the fit to observed elastic response spectra. The proposed genetic algorithm technique allows us to explore the sensitivity of the results to multiple source parameters, including hypocenter location, focal mechanism (Strike and Dip), P-wave velocity in depth, fault dimension and rupture and healing velocities.  相似文献   

Optimization of Bottom Friction Coefficient Using Inverse Modeling in the Persian Gulf     

Ranji  Zahra  Soltanpour  Mohsen 《Ocean Science Journal》2021,56(4):331-343

Ocean Science Journal - A practical method for the calibration of the ocean circulation model is introduced using measured water levels along the Persian Gulf coastlines. Dimensional analysis is...  相似文献