The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform
Hadi Arvanaghi - One of the best experts on this subject based on the ideXlab platform.
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Effect of Drain Pipes on Uplift Force and Exit Hydraulic Gradient and the Design of Gravity Dams Using the Finite Element Method
Geotechnical and Geological Engineering, 2021Co-Authors: Ali Taheri Aghdam, Farzin Salmasi, John Abraham, Hadi ArvanaghiAbstract:The effects of diameter and location of Drain Pipes on the uplift force and exit hydraulic gradient for a gravity dam are investigated. A numerical model of a gravity dam is simulated using the finite element method. The results indicate that Drain Pipes under a gravity dam reduce the uplift force and exit hydraulic gradient. The optimal location of the Drain pipe with respect to reducing uplift force is 0.25 L (where L is the dam width) from the dam heel, and is 0.75 L with respect to the exit hydraulic gradient. In addition, with increasing Drain depth, the uplift force first decreases and then increases. The Drain pipe diameter has little effect on uplift force and exit hydraulic gradient and thus its selection should depend on other considerations. When the Drain pipe is located at its optimum location with respect to minimizing the uplift force, the volume of dam materials is reduced ~ 30–50%.
Ali Taheri Aghdam - One of the best experts on this subject based on the ideXlab platform.
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Effect of Drain Pipes on Uplift Force and Exit Hydraulic Gradient and the Design of Gravity Dams Using the Finite Element Method
Geotechnical and Geological Engineering, 2021Co-Authors: Ali Taheri Aghdam, Farzin Salmasi, John Abraham, Hadi ArvanaghiAbstract:The effects of diameter and location of Drain Pipes on the uplift force and exit hydraulic gradient for a gravity dam are investigated. A numerical model of a gravity dam is simulated using the finite element method. The results indicate that Drain Pipes under a gravity dam reduce the uplift force and exit hydraulic gradient. The optimal location of the Drain pipe with respect to reducing uplift force is 0.25 L (where L is the dam width) from the dam heel, and is 0.75 L with respect to the exit hydraulic gradient. In addition, with increasing Drain depth, the uplift force first decreases and then increases. The Drain pipe diameter has little effect on uplift force and exit hydraulic gradient and thus its selection should depend on other considerations. When the Drain pipe is located at its optimum location with respect to minimizing the uplift force, the volume of dam materials is reduced ~ 30–50%.
Richard J. Meinersmann - One of the best experts on this subject based on the ideXlab platform.
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Effect of chemical sanitizers with and without ultrasonication on Listeria monocytogenes as a biofilm within polyvinyl chloride Drain Pipes.
Journal of food protection, 2008Co-Authors: Mark E. Berrang, Joseph F. Frank, Richard J. MeinersmannAbstract:As part of a biofilm in a floor Drain, Listeria monocytogenes is exceedingly difficult to eradicate with standard sanitizing protocols. The objective of these studies was to test the use of ultrasonication to break up biofilm architecture and allow chemical sanitizers to contact cells directly. L. monocytogenes biofilms were created in model polyvinyl chloride Drain Pipes. Chemical sanitizers (quaternary ammonium, peroxide, or chlorine) were applied to the Drain Pipes with and without a 30-s ultrasonication treatment. Controls using sterile water were included for comparison. L. monocytogenes cells were enumerated from the liquid in the Drain and the inside wall surface of the pipe. All chemicals lowered numbers of planktonic cells from 6.6 log CFU/ml in the water control to
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effect of chemical sanitizers with and without ultrasonication on listeria monocytogenes as a biofilm within polyvinyl chloride Drain Pipes
Journal of Food Protection, 2008Co-Authors: Mark E. Berrang, Joseph F. Frank, Richard J. MeinersmannAbstract:As part of a biofilm in a floor Drain, Listeria monocytogenes is exceedingly difficult to eradicate with standard sanitizing protocols. The objective of these studies was to test the use of ultrasonication to break up biofilm architecture and allow chemical sanitizers to contact cells directly. L. monocytogenes biofilms were created in model polyvinyl chloride Drain Pipes. Chemical sanitizers (quaternary ammonium, peroxide, or chlorine) were applied to the Drain Pipes with and without a 30-s ultrasonication treatment. Controls using sterile water were included for comparison. L. monocytogenes cells were enumerated from the liquid in the Drain and the inside wall surface of the pipe. All chemicals lowered numbers of planktonic cells from 6.6 log CFU/ml in the water control to < 100 CFU/ml. Attached cells were also affected by the chemical sanitizers. Approximately 6.0 log CFU/cm2 of the inner wall surface was detected in water control Pipes, and ultrasonication did not lower these numbers. With or without ultrasonication, the peroxide-based sanitizer was effective for reducing the numbers of attached L. monocytogenes cells, resulting in approximately 2.0 log CFU/cm2. Both the chlorine- and quaternary ammonium-based sanitizers reduced the number of attached L. monocytogenes cells to a lesser degree, resulting in 4.2 to 4.4 log CFU/cm2. However, addition of ultrasonication improved the performance of both these sanitizers, causing a further reduction to 3.1 and 2.9 CFU/ cm2 for quaternary ammonium- and chlorine-based chemicals, respectively. These results indicate that a peroxide-based sanitizer alone can be very effective against biofilm L. monocytogenes in Drain Pipes, and the addition of ultrasonication can improve the effectiveness of chlorine or quaternary ammonium sanitizers.
Farzin Salmasi - One of the best experts on this subject based on the ideXlab platform.
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Effect of Drain Pipes on Uplift Force and Exit Hydraulic Gradient and the Design of Gravity Dams Using the Finite Element Method
Geotechnical and Geological Engineering, 2021Co-Authors: Ali Taheri Aghdam, Farzin Salmasi, John Abraham, Hadi ArvanaghiAbstract:The effects of diameter and location of Drain Pipes on the uplift force and exit hydraulic gradient for a gravity dam are investigated. A numerical model of a gravity dam is simulated using the finite element method. The results indicate that Drain Pipes under a gravity dam reduce the uplift force and exit hydraulic gradient. The optimal location of the Drain pipe with respect to reducing uplift force is 0.25 L (where L is the dam width) from the dam heel, and is 0.75 L with respect to the exit hydraulic gradient. In addition, with increasing Drain depth, the uplift force first decreases and then increases. The Drain pipe diameter has little effect on uplift force and exit hydraulic gradient and thus its selection should depend on other considerations. When the Drain pipe is located at its optimum location with respect to minimizing the uplift force, the volume of dam materials is reduced ~ 30–50%.
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Investigating reduction of uplift forces by longitudinal Drains with underlined canals
ISH Journal of Hydraulic Engineering, 2017Co-Authors: Farzin Salmasi, Rahman Khatibi, Bahram NouraniAbstract:A provision of Drainage systems with underlined canals is investigated aiming to reduce uplift forces and to increase canal stability when groundwater surface is high, without which failure is likely from subsequent heaving and cracking of canal lining. The investigation generates sufficient data for typical 2D canal cross-sections by numerically solving a wide range of configurations using a provision of Drain Pipes. The generated data comprise the correlation between uplift forces and the various configuration parameters in terms of effects of position of the Drain Pipes, their size and hydraulic factors, such as the effect of phreatic surface. These data-sets were used to develop both regression model and an Artificial Neural Network model. Results showed that application of Drain Pipes under the canal bed at appropriate positions is effective in reducing groundwater depth and thereby reducing uplift pressures.
John Abraham - One of the best experts on this subject based on the ideXlab platform.
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Effect of Drain Pipes on Uplift Force and Exit Hydraulic Gradient and the Design of Gravity Dams Using the Finite Element Method
Geotechnical and Geological Engineering, 2021Co-Authors: Ali Taheri Aghdam, Farzin Salmasi, John Abraham, Hadi ArvanaghiAbstract:The effects of diameter and location of Drain Pipes on the uplift force and exit hydraulic gradient for a gravity dam are investigated. A numerical model of a gravity dam is simulated using the finite element method. The results indicate that Drain Pipes under a gravity dam reduce the uplift force and exit hydraulic gradient. The optimal location of the Drain pipe with respect to reducing uplift force is 0.25 L (where L is the dam width) from the dam heel, and is 0.75 L with respect to the exit hydraulic gradient. In addition, with increasing Drain depth, the uplift force first decreases and then increases. The Drain pipe diameter has little effect on uplift force and exit hydraulic gradient and thus its selection should depend on other considerations. When the Drain pipe is located at its optimum location with respect to minimizing the uplift force, the volume of dam materials is reduced ~ 30–50%.
