Backrests influence the comfort of seated people. With 21 subjects sitting with three backrest heights (no backrest, short backrest, high backrest) discomfort caused by lateral, roll, and fully roll-compensated lateral oscillation was investigated at frequencies between 0.25 and 1.0 Hz. With lateral oscillation, the short backrest reduced discomfort at frequencies less than 0.63 Hz and the high...

Recent observations of the low–mass X–ray binary 4U 1636–53 with the Rossi X– ray Timing Explorer show, for the first time, a kiloHertz quasi–periodic oscillation (kHz QPO) peak separation that exceeds the neutron star spin frequency as inferred from burst oscillations. This strongly challenges the sonic–point beat frequency model for the kHz QPOs found in low–mass X–ray binaries. We detect two...

A modulated holding beam shining a VCSEL above threshold can improve modulation bandwidth by adjusting the semiconductor laser’s relaxation oscillation frequency. The improved modulation characteristics are accompanied by reduced damping rate. By choosing correct parameters, dynamical behavior of system and cavity solitons is changed.

Abstract We focuse on issues related to degradation of FPGAs which has become dominant due to scaling and quantitatively estimate the degradation of FPGAs by NBTI. We map ring oscillators on the Cyclone II FPGAs and measure the variation of oscillation frequency. In the result, the variation of oscillation frequency is 5.97%. As for degradation of FPGAs, we measure the variation of oscillation ...