Scientific American

Mathematicians make a breakthrough on 2,000-year-old problem of curves

Since ancient Greece, researchers have tried to isolate special rational points on curves. Now they have the first ever formula that applies uniformly to all curves ...
IEEE

Variable Turn Ratio Current-Source Charge Pump Power Factor Correction Converter With High Power Factor and Wide Input Voltage Range

Abstract: Power factor correction (PFC) is widely used in ac–dc converters to improve power quality. The current-source charge pump (CS-CP) PFC converter has the advantages of simple structure, easy ...
Yahoo

The Lotto Matrix: Growing Mega And A ‘Won’ That Feels Like A Loss

Add Yahoo as a preferred source to see more of our stories on Google. Mega Millions is a solid “Big Boy” with a $346 million jackpot up for grabs. Those pressed for cash can select the $156.1 million ...
IEEE

Variable Switching Frequency Techniques for Power Converters: Review and Future Trends

Abstract: Variable-frequency (VF) techniques have been widely applied in the fields of power electronics and motor drives. Based on the categories of frequency variables, the VF techniques can be ...