This paper studies the energy-saving adaptive robust precision motion control of a single-rod hydraulic cylinder through the use of programmable valves. The programmable valves used in this study is a unique combination of five proportional cartridge valves connected in such a way that the meter-in and meter-out flows can be independently controlled by four of the valves as well as a true cross...

in islamic civilization, rhetoric is the product of a great attempt to find out the secrets of quranic language; nevertheless, the achievements of such studies have been mechanically applied to persian which, compared to arabic, has a different linguistic system and literary conventions. this approach has brought about problems in defining literary terms, internal rhythm being one of them. this...

Wind friction threshold speeds (V,t) for particle movement were determined in a low pressure boundary layer wind tunnel at an atmospheric pressure of 5.3 mb. The results imply that for comparable pressures on Mars, the minimum V,t is about 2.5 m/sec, which would require free-stream winds of 50 to 135 m/sec, depending on the character of the surface and the atmospheric conditions. The correspond...

We have used a quartz crystal microbalance to study the dynamical properties of thin films of solid nitrogen adsorbed on a lead substrate in the temperature range 4 K,T,14 K. Simple mechanical models relate the frequency shift and the Q of the microbalance to the friction at the N2 /Pb interface. By varying either the magnetic field or the temperature, the Pb substrate could be prepared in the ...

We did an experimental study on Taylor-Couette flow in between two coaxial cylinders of length L = 220 mm and radii r i = 110 and r o = 120, respectively, the fluid-filled 'Taylor-Couette gap' or TC-gap being h = 10 mm, thus gap ratio η = r i /r o = 0.917, and gap aspect ratio L/h = 22). Both cylinders are rotating independently, with angular frequencies ω i,o , The torque T on the inner cylind...