-The Industrial Electronics Laboratory at the Swiss Federal Institute of Technology (EPFL) in Lausanne has built a prototype of a revolutionary two-wheeled vehicle. Due to its configuration with two coaxial wheels, each of which is coupled to a DC Motor, the vehicle is able to do stationary U-turns. A control system, made up of two decoupled state space controllers, pilots the motors so as to keep the system in equilibrium.See http://leiwww.epfl.ch/joe for a video demonstration of JOE.
JET was extensively modified in the 1992/93 shutdown. The new pumped divertor and many new systems were brought into operation early in 1994. Operations have progressed to 4 MA plasma current and, with substantial additional heating, H-mode confinement results confirm the expected scaling. The high power handling capability of the pumped divertor with sweeping is estimated at 20 MW for 20 s. H-mode plasmas have large Type I ELMs. With lower hybrid heating alone, 2 MA full current drive has been achieved with good efficiency, and with ICRF power, effective heating and direct electron heating have been demonstrated.
Double-conversion UPS are often the preferred choice for protecting critical loads, the typical example being IT equipment in data centres. While providing optimum protection, double-conversion UPS only provide limited efficiency. Some UPS feature a high-efficiency operating mode (so-called ECO mode) where the load is fed via the bypass path. Particularly, some Advanced ECO mode implementations combine efficiency with a very fast transfer to inverter when the utility voltage is going out of given tolerances. Traditionally, market adoption of these technologies has been limited, following concerns on exposure of the load to utility disturbances. This paper aims to clear these concerns by presenting experimental results from testing real IT equipment with UPS protection operating in Advanced ECO Mode. Particularly, the system has been exposed to common power quality events on the UPS input utility, while evaluating the residual effect on the IT equipment power supply.
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