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Seyyed Farhad Mirfakhraei,Hamid Reza Ahmadi,Ricky Chan 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.25 No.2
In this research, toggled actuator forces were examined. For achieving to this object, an actuator was installed in a toggle pattern in a S.D.O.F frame and actuator forces were investigated thru a numerical analysis process. Within past twenty years, researchers tried to use strong bracing systems as well as huge dampers to stabilize tall buildings during intensive earthquakes. Eventually, utilizing of active control systems containing actuators to counter massive excitations in structures was emerged. However, the more powerful earthquake excitations, the more robust actuators were required to be installed in the system. Subsequently, the latter process made disadvantage to the active control system due to very high price of the robust actuators as well as their large demands for electricity. Therefore, through a numerical process (Part I), influence of toggled actuator pattern was investigated. The algorithm used in the system was LQR and ATmega328 was selected as a control platform. For comparison, active tendon control system was chosen. The final results show clearly that using the toggle pattern mitigates the required actuator forces enormously leading to deploy much lighter actuators.
Naeemeh Zari,Jalal Hassan,Kourosh Tabar-Heydar,Seyyed Hamid Ahmadi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.86 No.-
An extraction method employing dispersive liquid–liquid microextraction (DLLME) and ICP-OES hasbeen developed for rapid separation, pre-concentration and determination of ultra-trace amount of Au(III). The extraction of the analyte was performed in the presence of a quaternary ammonium cation, NMethyl-N, N, N-trioctylammonium chloride, (Aliquat 336) as an extractant based on ion-associationextraction system.1-octanol and acetonitrile were used as extraction and disperser solvents, respectively. The variables affecting the extraction conditions were optimized. Calibration curve in the range of 0.3–100 ng mL 1, the detection limit of 0.09 ng mL 1, enrichment factor of 150 and extraction recovery of 74%were obtained. The precision (R.S.D. %) of the method was 6% for 5 replicates and recoveries of 10 ng mL 1Au(III). The combined DLLME method with ICP-OES can readily determine Au(III) at trace (mg L 1) levelusing only 10 mL of sample solution (tap, lake, and mining water) and ore sample without interference bythe matrices. This methodology is simple, fast, and low cost which can be used in routine analyticallaboratories.