We report the use of UV light to control the dynamic surface tensions of mixed surfactant systems containing sodium dodecyl sulfate, SDS, and 4,4′-bis(trimethylammoniumhexyloxy)azobenzene bromide, BTHA. The light influences the dynamic surface tension of these solutions by driving the isomerization of the azobenzene moiety from cis to trans. By combining use of the du Nouy ring, maximum bubble ...

detention rockfill dams are accounted as economically efficient structures for flood control, river bed and banks protection, flow diversion, etc. as the hydraulic behavior of these structures, when are used for flood control, is affected by the depth of water in their porous media, there are interests to predict water surface profile through the body of these structures. in this research, we d...

This paper focuses on the position tracking control issue of electrohydraulic systems (EHS). The dynamical model EHS is introduced in first place, based which a type Variable Structure Disturbance Observer (VSDO) constructed for to estimate parametric uncertainty possesses. Then, backstepping controller designed under VSDO realize high precision purpose. To avoid phenomenon differential explosi...