List of Articles Roozbeh Aghamajidi

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  1 - Study the Important Parameters for Increasing Soil Bearing Capacity of Troubled Soil for The Implementation of Hydraulic Structures with Utilizing Cement
  Amirabbas Kamanbedast Roozbeh AGHA MAJIDI
  The increasing need to soil as the main aggregates in water projects and water supply channels and the lack of quality and the necessary geotechnical properties of soil in soil improvement today, all with the use of materials and additives are put into consideration. Mo More

  The increasing need to soil as the main aggregates in water projects and water supply channels and the lack of quality and the necessary geotechnical properties of soil in soil improvement today, all with the use of materials and additives are put into consideration. Modulus of elasticity indicates the amount of soil strain against a certain amount of tension. Whatever the value of this parameter is, the more dirt the stresses incurred will have less deformation. The aim of this research effect of modulus of elasticity and the density changes of cement and clay soil compressive strength is a problem. Clay soil samples in this research only and clay soil-cement mixing with 10% and the percentage of moisture in the density of the optimum, 85, 95 and 100 per cent were single-pivot about the test. The results of the experiments indicate that cement by adding elasticity modulus up to 420 times more and increase the elasticity modulus of cement, to shelf a few times (depending on the density) increased. As the density of the sample is, the more it is more greatly increased. Clay compressive strength of cement also has a 20 times increase. Manuscript profile
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  2 - Laboratory Study of SimultaneousCoarse-gradient Roughness and Positive Slope on Hydraulic Jump Length in Classical Stilling Basin
  Roozbeh AGHA MAJIDI Amir hossein Nozari
  Hydraulic structures such as stilling basins, mainly are used for the purpose of energy dissipation in the lower zone of overflows, chute and diversion dams, in order to control hydraulic jump. In this research, the rate and effect of the jump is determined by laborator More

  Hydraulic structures such as stilling basins, mainly are used for the purpose of energy dissipation in the lower zone of overflows, chute and diversion dams, in order to control hydraulic jump. In this research, the rate and effect of the jump is determined by laboratory tests. In these experiments, the sharp roughness of the bed of basin and also the change in the slope of the basin( structure ) from 0 to 0.3 percent were tested and parameters such as flow rate, initial depth, secondary depth, jump length of water surface profile, water head on overflow crown and water head prior to overflow were accurately measured. The analysis of data showed that the sharp roughness can effectively reduce the length of jump to to 35.5%. For sharp shape roughness, with an increase in the landing rate, the ratio y2 / y1 increases by an average of 6.5%. For a Froude number with a sharp roughness setting, the Lj / y2 ratio decreases by an average of 1.2%. Manuscript profile
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  3 - Study and estimation of the useful life of the dam under the influence of input sediments deposited with using Karun 92 software
  roozbeh AGHA MAJIDI mohammad rafiee Rafiee
  the sediment accumulation in the reservoirs places upstream and downstream of the dam under the influence of ecosystem changes. In order to increase the volume of regulated water in the river basin and prevent the introduction of river sediments into the dam reservoir a More

  the sediment accumulation in the reservoirs places upstream and downstream of the dam under the influence of ecosystem changes. In order to increase the volume of regulated water in the river basin and prevent the introduction of river sediments into the dam reservoir and as a result of increasing the useful life of the dam and the optimal management of water resources in the given time, the required data from the relevant companies from the Tangab Dam was obtained and Using Karun's analysis software, based on the calculations performed by the software, the modified volume (after sedimentation) after one year and after 50 years from the beginning of operation, using the method of increasing the level to The order of 1021.646 million cubic meters and 605.664 million cubic meters, and also for the method of reducing the level of these numbers is equal to 1021.6 million million Rmkb and 064/580million cubic meters is estimated. Given the reservoir type and sediment volume, the curves of hp and h'p are plotted. According to the power plant's level, the reservoir level of the dam increases with the calculation of sediment distribution by increasing the level after 110 years from the plant's level of utilization, and this also occurs in the method of reducing the level after 100 years. Manuscript profile
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  4 - Investigation of water head variation& relation to empirical Coefficient n of Stepped short Shaft Spill way
  roozbeh AGHA MAJIDI mohammad nasre. isfahani
  These spillways (Stepped shaft spillways) pass more flow discharges through themselves in comparison to smooth spillways theoretically. Therefore knowing of flow behavior of these Spillways, help using better and more efficiently. Moreover, using vortex breaker has grea More

  These spillways (Stepped shaft spillways) pass more flow discharges through themselves in comparison to smooth spillways theoretically. Therefore knowing of flow behavior of these Spillways, help using better and more efficiently. Moreover, using vortex breaker has great effect on passing Flow through Shaft Spillway. For using more efficiently, the risk of flow water head on the crest decreases to less than fluid vapor water head on the crest , called cavitation’s, should be prevented as far as possible. At this research, it has been tried to study different behavior of Stepped chamber and different vortex breaker shapes on spillway flow. From the viewpoint of the effects of flow regime changes on spillway, changes of step dimensions, and the change of type of flow range will Studied Effectively. And finally the best the relation between water head on the crest and Discharge Coefficient are determined. Manuscript profile
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  5 - Influential study of differential parameters in order to election of the type of special pumping stations and the suitable electric pumps
  Roozbeh AGHA MAJIDI محمدجواد نصراصفهانی
  The pumping station is a collection of pumps, driving forces and auxiliary equipment e.g., collector system, power supply system, and control and protection systems. Small pumping stations are usually designed in the simplest possible way for the ease of operation of au More

  The pumping station is a collection of pumps, driving forces and auxiliary equipment e.g., collector system, power supply system, and control and protection systems. Small pumping stations are usually designed in the simplest possible way for the ease of operation of auxiliary equipment. However, as the capacity of the pumping station increases, the technical complexity and design of peripheral equipment increases, which requires its own design according to the conditions, type of work, and location of the project. The choice of the type of station building, the type and capacity of the main and reserve pumps, in accordance with the special conditions of each project are contingent upon the nature of the plan. This study evaluates the basics of designing pumping stations, taking into account the above-mentioned issues, focusing on the system of pumping and transferring water from Dasht Zozen to the central site of the water supply facilities of Sangan Industries. Manuscript profile