International Journal of Systems Applications, Engineering & Development

ISSN: 2074-1308
Volume 12, 2018

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Volume 12, 2018

Title of the Paper: On Stabilizing Fractional Order Time Delay Systems by First Order Controllers


Authors: Karim Saadaoui

Pages: 8-11

Abstract: In this paper, the problem of stabilizing fractional order time delay systems by first order controller is investigated. The proposed solution is based on finding a set of global stability regions in the controller’s parameter space. One of the controller’s parameters is fixed and the stability region in the space of the remaining parameters is determined using the D-decomposition method. An illustrative example is given to show the effectiveness of the proposed approach.

Title of the Paper: Numerical Simulation of Near Field and Far Field Brine Discharge from Desalination Plants (A Case Study in Persian Gulf)


Authors: Ahmad Rezaee Mazyak, Mehdi Shafieefar, Alireza Shafieefar

Pages: 1-7

Abstract: Seawater desalination has gained importance in coastal countries where conventional water sources are insufficient or overexploited. Seawater desalination contributes to mitigate water scarcity. Brine is a sub-product of desalination plants and is usually discharged into seawaters, with potentially negative effects on marine ecosystems. The process of desalination is not per se environmentally friendly and seawater desalination plants also contribute to the wastewater discharges that affect coastal water quality. Therefore, modelling of the brine discharge dispersion is crucial in the design of coastal desalination plants. In this paper, the salinity dispersion pattern of discharged saline water from the outfall pipeline of SAKO desalination facilities is studied to check the possibility of recirculation and fulfilment of environmental criteria. The SAKO desalination plant has a production capacity of 1,000,000m3/day and is located in northern coast of Persian Gulf, Bandar Abbas, Iran. The salinity dispersion process of a brine jet with ambient water includes near and far field regions. In this research, CORMIX II was used to model the near field process and then check the environmental criteria. The environmental criterion indicates that the excess salinity in a 200 meter diameter from the outfall should be less than 10% of the ambient salinity. Near field simulations indicate that salinity increment in 18 meter distance from the outfall will be about 4.17 PSU which is less than the 42 PSU ambient salinity. Hence, the environmental criteria are thoroughly met. The results of the near field model have been used as input data for the far field model (HD model). The far field model covers north of Qeshm Island and is set up to check recirculation criteria. Results of this simulation have been extracted in the intake location and they show that there is no salinity increment trend at the intake. Consequently, recirculation problem will not happen. Also, results show that the optimization of near field dilution of brine discharge plays an extremely important role in checking the possibility of recirculation and environmental criteria.