this paper presents a new control method for a three-phase four-wire unified power quality conditioner (upqc) to deal with the problems of power quality under distortional and unbalanced load conditions. the proposed control approach is the combination of instantaneous power theory and synchronous reference frame (srf) theory which is optimized by using a self-tuning filter (stf) and without us...

We have corrected a problem in our computational code that determined the normal-state resistance. In general, we find a reduction of Rn when the correlations are large and there is more than one plane in the barrier. The reduction of Rn affects four figures from the original paper, and affects the conjecture about ‘‘intrinsic pinholes.’’ We discovered that our calculations had not fully conver...

We have studied the nonlinear current-voltage characteristic of a two dimensional lattice Coulomb gas by Monte Carlo simulation. We present three different determinations of the power-law exponent a(T ) of the nonlinear current-voltage characteristic, V ∼ Ia(T )+1. The determinations rely on both equilibrium and non-equilibrium simulations. We find good agreement between the different determina...

Attention is drawn to the fact that the non-linear electrical currentvoltage characteristic of porous track-etched poly(ethylene terephtalate) membranes, reported by Wolf, Siwy, Korchev and Spohr in Cell. Mol. Biol. Lett. 4 (1999) 553-565, is very similar to that observed with cross-linked polyelectrolyte gel membranes with negatively charged fixed ionic groups (cation exchange membranes). This...

An improved current-mode CMOS voltage reference derives its temperature independent characteristic from two temperature dependent currents which are summed together into a resistor to generate the reference voltage. A CMOS proportional to absolute temperature (FTAT) current generator using substrate bipolar transistors creates the current that increases with temperature. A CMOS threshold voltag...

We study transport through a semiconductor superlattice with an electric field parallel to and a magnetic field perpendicular to the growth axis. Using a semiclassical balance equation model with elastic and inelastic scattering, we find that (1) the current-voltage characteristic becomes multistable in a large magnetic field and (2) "hot" electrons display novel features in their current-volta...

For the diode circuits shown in Figure 1, consider the diodes to be ideal. The input voltage vI given to the circuit is a sinusoid with a peak value of 6V and frequency 2kHz. For each circuit (a) Derive the expression for the transfer characteristic vO versus vI for the circuit. (b) Plot the transfer characteristic vO versus vI indicating the values of all significant points and the values of t...

Because wind generators (WGs) in a wind power plant (WPP) produce different active powers due to wake effects, the reactive power capability of each WG is different. This paper proposes a hierarchical voltage control scheme for a WPP that uses a WPP controller and WG controller. In the proposed scheme, the WPP controller determines a voltage error signal by using a PI controller and sends it to...

Nanoscale superconductor/semiconductor hybrid devices are assembled from indium arsenide semiconductor nanowires individually contacted by aluminum-based superconductor electrodes. Below 1 kelvin, the high transparency of the contacts gives rise to proximity-induced superconductivity. The nanowires form superconducting weak links operating as mesoscopic Josephson junctions with electrically tun...