University of Bahrain

About: University of Bahrain is a education organization based out in Madīnat ‘Īsá, Bahrain. It is known for research contribution in the topics: Thin film & Doping. The organization has 1650 authors who have published 3405 publications receiving 48162 citations. The organization is also known as: Bahrain University & UoB.

Total and methylmercury intake associated with fish consumption in Bahrain

Abstract: This study was performed to determine the total mercury (T-Hg) and methylmercury (MeHg) concentrations in five fish species: Scomberomorus commerson, Siganus canaliculatus, Epinephelus coioides, Lethrinus nedulosus and Sardinella albella. The highest mean concentrations of T-Hg and MeHg (0.126±0.009 and 0.123±0.010 mg/kg wet weight, respectively) were found in the carnivorous fish S. commerson, whereas the lowest concentrations were determined in the herbivorous fish S. albella (0.029±0.005 and 0.028±0.005 mg/kg wet weight, respectively). MeHg was the major form of mercury accumulated in fish, comprising more than 94.6% of the T-Hg in fish samples examined in this study. The overall mean concentrations of T-Hg and MeHg found in the species studied were generally lower than those reported in earlier studies in the region and did not exceed international limits (0.5 and 0.3 mg/kg wet weight, respectively). The overall mean of T-Hg intake from fish was estimated to be 0.0003 mg/kg/week, which is less than the threshold level set by the World Health Organization (WHO) (0.0016 mg/kg/week).

Optimal switching of dynamic braking resistor, reactor or capacitor for transient stability of power systems

Abstract: Three dynamic braking strategies for transient stabilisation of a power system have been investigated. These involve resistor, resistor-reactor and resistor-capacitor switching, respectively. The switching strategies are obtained from an optimum feedback control law. The proposed controls were tested on a four-machine power system. It was observed that although all the optimal strategies were able to contain the first swing instability, the resistor-capacitor switching was the best for electromechanical as well as electrical transients control.