Recent investigations have focused on the use of active phase imbalance schemes using series connected FACTS devices for subsynchronous resonance (SSR) and power swing damping. This paper compares the effectiveness of TCSC and SSSC based single phase compensation schemes with the corresponding three phase schemes. Controllability of swing modes as well as torsional modes is compared by using a ...

With the migration toward low supply voltages in low-power SRAM designs, threshold and supply voltage fluctuations will begin to have larger impacts on the speed and power specifications of SRAM’s. We present techniques based on replica circuits which minimize the effect of operating conditions’ variability on the speed and power. Replica memory cells and bitlines are used to create a reference...

Since the early 1970s, the states of the Tenth Federal Reserve District have experienced wide swings in economic activity and interstate migration. The swings in migration not only reflect the region’s economic performance but also have important consequences for future economic activity. This article discusses recent trends and prospects for migration into and out of the district. The first se...

welcome unanimity in UK media treatment of a recent paper on measles, mumps, rubella (MMR) vaccine in the Archives of Disease in Childhood. This was a review by David Elliman of St George’s Hospital and Helen Bedford of the Institute of Child Health, London, of all the evidence concerning alleged links with autism and inflammatory bowel disease. They concluded that there were no such links –— b...

PURPOSE: Large price swings for individual drugs complicate the hospital purchasing process, both increasing costs and adversely affecting patient treatment therapy. The objectives for this study are, for a large regional hospital buyer, to describe price changes for individual drugs, therapeutic classes, and drug companies, and to determine factors associated with large price swings. METHODS: ...