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Search Results: 1 - 10 of 3777 matches for " Seyed Mohsen "
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Zonation and Prediction of Land Subsidence (Case Study-Kerman, Iran)  [PDF]
Seyed Mahmood VaeziNejad, Mohamad Mohsen Tofigh, Seyed Morteza Marandi
International Journal of Geosciences (IJG) , 2011, DOI: 10.4236/ijg.2011.22011
Abstract: Drought and Immethodical ground water withdrawal in recent years has caused numerous problems such as subsidence due to falling of subsurface water table, the reduction of water quality, etc. in cities across the world. This research as a case study deals with harmful effects of subsurface water withdrawal in the city of Kerman and practical monitoring of the subsidence and makes prediction of land subsidence. The artificial neural network has been used for modeling the monitored results and prediction of future subsidence. A surveying network with more than 500 installed benchmarks in an area of 334 square kilometer has been used to measure the subsidence of the city area. Benchmarks were installed in the beginning of 2004 and were monitored at the end of 2004, 2006, and 2007. For modeling, extra data were obtained from Iranian Surveying Organization for the years before 2004. The resulting model showed that, the subsidence varies between zero and 15cm per year in different parts of the City, which depends on the subsurface-layered soils, their compressibility, and the manner of subsurface water withdrawal.
Simulation and Analysis of Carrier Dynamics in the InAs/GaAs Quantum Dot Laser, Based upon Rate Equations  [PDF]
Ahmadreza Daraei, Seyed Mohsen Izadyar, Naser Chenarani
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.31018
Abstract:

In this paper, simulation of InAs/GaAs quantum dot (QD) laser is performed based upon a set of eight rate equations for the carriers and photons in five energy states. Carrier dynamics in these lasers were under analysis and the rate equations are solved using 4th order Runge-Kutta method. We have shown that by increasing injected current to the active medium of laser, switching-on and stability time of the system would decrease and power peak and stationary power will be increased. Also, emission in any state will start when the lower state is saturated and remain steady. The results including P-I characteristic curve for the ground state (GS), first excited state (ES1), second excited state (ES2) and output power of the QD laser will be presented.

Sequence Stratigraphy and Sea Level Fluctuations of the Ab-Deraz Formation, Based on Palynological Evidence and Magnetic Susceptibility Method “Kopet-Dagh Sedimentary Basin, Northeastern Iran”  [PDF]
Farshid Yousefimoghadam, Seyed Mahmood Hoseininezhad, Mohsen Allameh
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.55024
Abstract: Ab-deraz Formation is one of the Lithostratigraphic units of upper cretaceous (Middle Touronian-Santonian) in Kopet-Dagh sedimentary basin, located in northeastern Iran. The aims of this study are separating sequence units and determining sea level Fluctuation by using palynological factors and comparison via magnetic susceptibility which is used for the first time in Ab-deraz Formation. Assuming the average MS magnitude as the proxy for mean sea level changes, positive Magnetic Susceptibility (MS) values were considered to present sea level falls and negative values for sea level rises. Based on these data a curve showing water level fluctuations throughout the stratigraphic column was prepared which shows a general trend of regression from base to the top of the formation. To test accuracy of this method, magnetic susceptibility results were compared with those gained from palynology and palynofacies studies. Based on the changes in palynological factors (the terrestrial/marine particles ratio, C/PPC ratio, diversity and abundance of dinoflagellate), palynofacies, for separate sequences, three sequences of the third type with four sequence boundaries, (3 boundaries of the type II and one boundary of the type I) were differentiated, confirming the results gained from magnetic susceptibility method.
Comparison of Cancellous Bone Histomorphometry Between Young Men and Women
Shahtaheri Seyed Mohsen
Pakistan Journal of Biological Sciences , 2006,
Abstract: The study of micro architecture of cancellous bone is important factor in diagnosis of bone diseases such as osteoporosis. Bone mineral density depends on factors like sex, age, genetic and environment. Bone mass, number of trabeculae, trabecular thickness decrease with aging in both sexes. The aim of this study was to investigate trabecular bone architecture in young healthy men and women. Iliac crest bone biopsies were taken from 53 healthy Caucasian men and women (28 men and 28 women, ages 20-49). The histomorphometry of cancellous bone was compared in undecalcified sections of iliac crest bone biopsies. Sections (8 μm) were analyzed by an automated trabecular analysis system (TAS) which measures a comprehensive range of structural variables such as bone volume, trabecular separation, number, connectivity and width. Although variables like bone volume, bone surface and trabecular thickness in men were more than women but this difference was not significant. Trabecular separation in men was less than women and this was significant. In addition number of trabecular nodes and index of node to terminus in men was more than women which this difference was not significant. Trabecular length was more in men than women and this was significant. In conclusion despite no significant difference in some of the above variables there is more mechanical strength due to less separation and more trabecular length in trabecular bone architecture in young men in comparison with young women.
Investigation of Power Factor Behavior in AC Railway System Based on Special Traction Transformers  [PDF]
Mohsen Kalantari, Mohammad Javad Sadeghi, Seyed Saeed Fazel, Siamak Farshad
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.211081
Abstract: The single-phase traction load has essentially an unbalance characteristic at the Point of Common Coupling (PCC), which injects harmonic into the utility grid. In this paper, the effect of harmonic distortion and unbalance loading are investigated simultaneously for electrical railway systems. Special traction transformers (i.e. single-phase, V/V, Wye-Delta, Scott, and Le Blanc) are used between the utility grid and the traction load. For analysis, different defini-tions of power factors are considered, which are presented by IEEE Std.1459. The detailed simulation study is made with MATLAB/SIMULINK program to represent the impacts of harmonic components and unbalance loading on the power factor behavior in the Electrical Railway systems.
Dasht-e Lut in Iran, the Most Complete Collection of Beautiful Geomorphological Phenomena of Desert  [PDF]
Abdollah Yazdi, Mohammad Hashem Emami, Seyed Mohsen Shafiee
Open Journal of Geology (OJG) , 2014, DOI: 10.4236/ojg.2014.46019
Abstract:

Given special tectonic and climatic conditions, Iran has the most diverse land-forms and beautiful geological phenomena, which could attract many scientific, adventurous tourists and geological researchers. The present study aims at studying and introducing wonderful geomorphological attractions and numerous geotourism potentials of very hot paradise of the earth, e.g. Dasht-e Lut of Iran, a desert which contains a collection of exclusive desert relieves and geological and geomorphological records of the world. Such unique perspectives as the biggest Nebkhas of the world, the largest Yardangs or Kaluts of the world, the hottest point of the earth, as well as rare species of desert structures such as salt marshes and salt polygons, Gandom Beryan Hill, massive sand dunes, Barchans, clay zones in pretty shapes, saline river , etc., present a vast and diverse extension of geographical beauties and phenomena of the desert. Using library studies, interpretation of satellite images and field studies, this study has been conducted. The results of the studies show that Lut Desert has considerable capability for carrying out complementary studies as well as effect on economic development process in national and international levels. In addition, geotourism development obstacles in Lut Desert are identified, and such solutions as development of ways for access to attractions, erection of geotourism development centers, advertisement and introduction of the desert's attractions, dispatch of guides with tourists, promotion of the region security, extension of accommodations and… for better use of the potentials of the desert, are provided. Furthermore, towards developing the region geotourism, some other fun and exciting activities such as sand skiing, racings and desert rallies, endurance cycling, sun bath, star observation, camel riding and so on, are suggested. Obviously, having various desert attractions and multiple geotourism potentials, Dasht-e Lut has the capability of being considered among global geoparks of UNESCO.

Estimation of Species Richness of Permian Foraminifera in Non-Parametric Methods and Investigation of Its Change Trend in Central Alborz, Western Tethys  [PDF]
Mohammad Medadi, Hossein Mosaddegh, Seyed Mohsen Aleali, Mahmoud Reza Majidifard
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.75045
Abstract: Species richness of foraminifera assemblages in the Permian succession, contains Dorud, Ruteh and Nessen Formations, in Central Alborz—North of Iran, was estimated and studied based on lithostratigraphy and microbiostratigraphy of Permian. We used four non-parametric estimators to investigate the species richness: Chao 2, Jackknife 1, Jackknife 2 and bootstrap. These methods estimates the species richness based on the presence/absence data of each taxon identified in the samples. We use the submenu of quadrat richness in “Past” [1] software to estimate richness in regional chronostratigraphic stages.The results show that the estimated diversity of foraminiferal assemblages with the exception of late Yakhtashian, increased constantly from Asselian to Murgabian with the highest diversity of foraminifera seen in the Murgabian. The main decrease in foraminiferal species richness happened during the Midian which corresponds to the kamura cooling event.
Petrology and Geochemical Properties of the Granitoid Complex of Chahar-Gonbad, Southeast Iran  [PDF]
Abdolhamid Ansari, Seyed Jamal Sheikh Zakariaii, Sara Dargahi, Mohsen Arvin
Open Journal of Geology (OJG) , 2017, DOI: 10.4236/ojg.2017.76058
Abstract: The Chargonbad batholite is located in Sirjan and southeast of magmatic zone of Urumieh-Dokhtar. The main volume of this rocks consisted of Granodiorite and Monzogranite, but it’s also consists of Quartzdiorite, Tonalite and Syenogranite. They have allotrimorphic granular texture with subordinate porphyritic texture. Their enclaves consist of: xenoliths enclaves, microgranular mafic enclaves (Diorite to Quartzdiorite in composition) and autolite enclaves (Tonalite, granodiorite and monzogranite in composition). The Chargonbad batholite rocks are also cut by different types of dykes which are mainly consisted of dykes and veins of pegmatic stage, microgranular dykes (andesit and andesit basaltic in composition) and microgranular dykes that are similar to mafic enclaves. Evidence shows that regional examples represent properties of granitoids type I. As well as, Granite of Granitoid body of this area has magnesium nature and shows the cordellarian granites features. Based on the tectonomagmatic environment determination diagrams, all samples from the Chahargonbad study area located in the arc island setting due to subduction and show the characteristic of active continental margin setting.
Facies Analysis, Depositional Environment of the Lower Permian Deposits of Chili Formation in Kalmard Block, Eastern Central Iran (Darin Section)  [PDF]
Javad Shahraki, Mohammad Javad Javdan, Seyed Mahmood Pahlavan Hashemi, Mohsen Jami, Mahdiyeh Nastooh, Seyed Mohammad Kalvandi
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.58049
Abstract: Early Permian deposits in north of Kalmard region recognize with formal group of Khan; they have various features in the different place. This group includes four different formations from lower to the upper part: Chili, Sartakht and Hermez. These formations consist of carbonate rocks. Chili Formation has 104 m, thickness in Darin section and consists of limestone with intermediates of shale and marland sandstone. Lower boundary of this formation is disconformable with Gachal formation. The upper boundary is separated by unconformity from the upper part Sartakht formation according to the lithological characters and microscopic studies, cause identifications of beach, intertidal, open and semi-restricted lagoon, shoals and bar and open marine sub-environ- ments for the Chili Formation. Vertical changes of microfacies and depth changes curve show much more thickness of shoals and bar microfacies, and little thickness of open and semi-re- stricted lagoon and open marine microfacies. Deposits of Chili Formation in Darin section deposited in the gentle gradient Homoclinal ramp in the south of Paleotethys Ocean. Two depositional sequences have been identified in this formation, based on recognized Fusulinid, show age of Sakmarian, which has adaptation with Lower Absaroka III.
RETRACTED: Lead in Karvandar River Basin Sediment, Sistan and Balouchestan, IRAN  [PDF]
Javad Shahraki, Mohammad Javad Javdan, Seyed Mahmood Pahlavan Hashemi, Mohsen Jami, Mahdiyeh Nastooh, Seyed Mohammad Kalvandi
Open Journal of Geology (OJG) , 2015, DOI: 10.4236/ojg.2015.58048
Abstract: Short Retraction Notice

The paper does not meet the standards of \"Open Journal of Geology\".

This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.

The full retraction notice in PDF is preceding the original paper, which is marked \"RETRACTED\".

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