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Papers by mohammad abdollahzadeh

Eurasian Journal of Analytical Chemistry, Jul 5, 2017

In this study, microstrainer application in recycle of Spent Filter Backwash Water (SFBW) has bee... more In this study, microstrainer application in recycle of Spent Filter Backwash Water (SFBW) has been investigated. The results show that physicochemical and biological quality of SFBW can be added to the inlet water but it must be treated with microstrainer filter. The SFBW was passed through standard membrane with 5,18,40,70 µm size and filtered SFBW was analyzed. 5, 18 and 40 µm membrane showed respectively the best results. Applying 5 µm membrane that the best results found removing amount of biological factors include: diatom 85.77 to 90 percent, Cyanophyceae 100%, Crustacean 100%, Rotifer 100%, and removing percent of physicochemical parameters include: Turbidity 44.78%, Iron 51.24% and Manganese 35.35%. In present study 18 µm membrane is economical membranes because after filtering the SFBW with 18 µm membrane can be added to the inlet water.

Journal of ocean engineering and marine energy, Jul 31, 2020

The friction on the water–solid interfaces continues to be the most important factor for the ener... more The friction on the water–solid interfaces continues to be the most important factor for the energy loss in many marine and submarine applications. Therefore, different techniques have been developed and are available to reduce friction and, as a result, the overall cost. In the past decades, the use of structured surfaces has been given considerable attention because of their specific characteristics such as their abilities in pressure drop reduction. However, an appropriate optimization method is required to find the best surface structure. In the present study, we consider a microgrooved substrate and examine the performance of three shapes including rectangular, elliptical, and trapezoidal cross-sections for the geometry of the grooves. A genetic algorithm is employed, as an optimization tool, and is coupled with the volume of fluid method, as a computational fluid dynamics method, and the drag is minimized. The configurations are compared and the optimum geometry is determined. The results indicate that about 22% decrease in the drag can be achieved. The best solution is considered and the effect of the velocity (capillary number) on the drag is determined. Furthermore, the amount of water that is penetrated into the grooves is discussed.

Eurasian Journal of Analytical Chemistry, 2017

In this study, microstrainer application in recycle of Spent Filter Backwash Water (SFBW) has bee... more In this study, microstrainer application in recycle of Spent Filter Backwash Water (SFBW) has been investigated. The results show that physicochemical and biological quality of SFBW can be added to the inlet water but it must be treated with microstrainer filter. The SFBW was passed through standard membrane with 5,18,40,70 µm size and filtered SFBW was analyzed. 5, 18 and 40 µm membrane showed respectively the best results. Applying 5 µm membrane that the best results found removing amount of biological factors include: diatom 85.77 to 90 percent, Cyanophyceae 100%, Crustacean 100%, Rotifer 100%, and removing percent of physicochemical parameters include: Turbidity 44.78%, Iron 51.24% and Manganese 35.35%. In present study 18 µm membrane is economical membranes because after filtering the SFBW with 18 µm membrane can be added to the inlet water.

Article history: Received 25 September 2014 Received in revised form 26 October 2014 Accepted 25 ... more Article history: Received 25 September 2014 Received in revised form 26 October 2014 Accepted 25 November 2014 Available online 29 December 2014

Journal of Ocean Engineering and Marine Energy, 2020

The friction on the water–solid interfaces continues to be the most important factor for the ener... more The friction on the water–solid interfaces continues to be the most important factor for the energy loss in many marine and submarine applications. Therefore, different techniques have been developed and are available to reduce friction and, as a result, the overall cost. In the past decades, the use of structured surfaces has been given considerable attention because of their specific characteristics such as their abilities in pressure drop reduction. However, an appropriate optimization method is required to find the best surface structure. In the present study, we consider a microgrooved substrate and examine the performance of three shapes including rectangular, elliptical, and trapezoidal cross-sections for the geometry of the grooves. A genetic algorithm is employed, as an optimization tool, and is coupled with the volume of fluid method, as a computational fluid dynamics method, and the drag is minimized. The configurations are compared and the optimum geometry is determined. The results indicate that about 22% decrease in the drag can be achieved. The best solution is considered and the effect of the velocity (capillary number) on the drag is determined. Furthermore, the amount of water that is penetrated into the grooves is discussed.

2020 28th Iranian Conference on Electrical Engineering (ICEE)

This essay addresses an observer-based robust fuzzy sliding mode controller design to maintain st... more This essay addresses an observer-based robust fuzzy sliding mode controller design to maintain stability and better tracking of a nonlinear system. To suppress the chattering phenomenon, a fuzzy sliding mode controller (sf) is used. Also, a neural network is utilized to generate gain of the optimal controller. The performance of the designed controller is evaluated with the Magnetic Levitation System (MLS), which has a sever nonlinearity in its model. Also, the Extended Kalman Filter (EKF) is utilized to approximate the states of this system accurately in the presence of perturbation and environmental noise. The simulation results are reported to show the effectiveness of the proposed method.

Eurasian Journal of Analytical Chemistry, Jul 5, 2017

In this study, microstrainer application in recycle of Spent Filter Backwash Water (SFBW) has bee... more In this study, microstrainer application in recycle of Spent Filter Backwash Water (SFBW) has been investigated. The results show that physicochemical and biological quality of SFBW can be added to the inlet water but it must be treated with microstrainer filter. The SFBW was passed through standard membrane with 5,18,40,70 µm size and filtered SFBW was analyzed. 5, 18 and 40 µm membrane showed respectively the best results. Applying 5 µm membrane that the best results found removing amount of biological factors include: diatom 85.77 to 90 percent, Cyanophyceae 100%, Crustacean 100%, Rotifer 100%, and removing percent of physicochemical parameters include: Turbidity 44.78%, Iron 51.24% and Manganese 35.35%. In present study 18 µm membrane is economical membranes because after filtering the SFBW with 18 µm membrane can be added to the inlet water.

Journal of ocean engineering and marine energy, Jul 31, 2020

The friction on the water–solid interfaces continues to be the most important factor for the ener... more The friction on the water–solid interfaces continues to be the most important factor for the energy loss in many marine and submarine applications. Therefore, different techniques have been developed and are available to reduce friction and, as a result, the overall cost. In the past decades, the use of structured surfaces has been given considerable attention because of their specific characteristics such as their abilities in pressure drop reduction. However, an appropriate optimization method is required to find the best surface structure. In the present study, we consider a microgrooved substrate and examine the performance of three shapes including rectangular, elliptical, and trapezoidal cross-sections for the geometry of the grooves. A genetic algorithm is employed, as an optimization tool, and is coupled with the volume of fluid method, as a computational fluid dynamics method, and the drag is minimized. The configurations are compared and the optimum geometry is determined. The results indicate that about 22% decrease in the drag can be achieved. The best solution is considered and the effect of the velocity (capillary number) on the drag is determined. Furthermore, the amount of water that is penetrated into the grooves is discussed.

Eurasian Journal of Analytical Chemistry, 2017

In this study, microstrainer application in recycle of Spent Filter Backwash Water (SFBW) has bee... more In this study, microstrainer application in recycle of Spent Filter Backwash Water (SFBW) has been investigated. The results show that physicochemical and biological quality of SFBW can be added to the inlet water but it must be treated with microstrainer filter. The SFBW was passed through standard membrane with 5,18,40,70 µm size and filtered SFBW was analyzed. 5, 18 and 40 µm membrane showed respectively the best results. Applying 5 µm membrane that the best results found removing amount of biological factors include: diatom 85.77 to 90 percent, Cyanophyceae 100%, Crustacean 100%, Rotifer 100%, and removing percent of physicochemical parameters include: Turbidity 44.78%, Iron 51.24% and Manganese 35.35%. In present study 18 µm membrane is economical membranes because after filtering the SFBW with 18 µm membrane can be added to the inlet water.

Article history: Received 25 September 2014 Received in revised form 26 October 2014 Accepted 25 ... more Article history: Received 25 September 2014 Received in revised form 26 October 2014 Accepted 25 November 2014 Available online 29 December 2014

Journal of Ocean Engineering and Marine Energy, 2020

The friction on the water–solid interfaces continues to be the most important factor for the ener... more The friction on the water–solid interfaces continues to be the most important factor for the energy loss in many marine and submarine applications. Therefore, different techniques have been developed and are available to reduce friction and, as a result, the overall cost. In the past decades, the use of structured surfaces has been given considerable attention because of their specific characteristics such as their abilities in pressure drop reduction. However, an appropriate optimization method is required to find the best surface structure. In the present study, we consider a microgrooved substrate and examine the performance of three shapes including rectangular, elliptical, and trapezoidal cross-sections for the geometry of the grooves. A genetic algorithm is employed, as an optimization tool, and is coupled with the volume of fluid method, as a computational fluid dynamics method, and the drag is minimized. The configurations are compared and the optimum geometry is determined. The results indicate that about 22% decrease in the drag can be achieved. The best solution is considered and the effect of the velocity (capillary number) on the drag is determined. Furthermore, the amount of water that is penetrated into the grooves is discussed.

2020 28th Iranian Conference on Electrical Engineering (ICEE)

This essay addresses an observer-based robust fuzzy sliding mode controller design to maintain st... more This essay addresses an observer-based robust fuzzy sliding mode controller design to maintain stability and better tracking of a nonlinear system. To suppress the chattering phenomenon, a fuzzy sliding mode controller (sf) is used. Also, a neural network is utilized to generate gain of the optimal controller. The performance of the designed controller is evaluated with the Magnetic Levitation System (MLS), which has a sever nonlinearity in its model. Also, the Extended Kalman Filter (EKF) is utilized to approximate the states of this system accurately in the presence of perturbation and environmental noise. The simulation results are reported to show the effectiveness of the proposed method.