We solve the problem of cargo transfer in high sea states over a ramp from a large, medium-speed, rollon/roll-off (LMSR) vessel to a smaller connector vessel of a surface effect ship (SES) type. Our aim is to reduce rampmotion between the LMSR and SES in order to provide a safer environment for cargo transfer. We design an air cushion actuated controller to estimate and cancel the wave disturba...

A first geophysical validation of the ASAR Wave Mode Level 2 product is performed using ASAR Wave Mode data acquired during May 2002, which have been co-located with ECMWF WAM spectra and wind speed data. First calibration results and a comparison of wind speed and wave spectral parameters are presented and discussed. The performance of the product is as expected, with very good agreement in te...

We propose an adaptive pulse-shaped orthogonal frequency division multiplexing (OFDM) scheme where the overhead and active sub-channels are adapted to jointly maximize capacity and fulfill the notching mask for coexistence with other devices operating in the same spectrum. The overhead includes the guard interval to partly compensate the channel dispersion, and the roll-off factor used by the s...

The ability of a helmet to reduce injury to the wearer in the first instance depends on whether it is securely in place during the impact. A helmet may be displaced or even ejected during a crash if it has been incorrectly fastened, worn, or inappropriately sized for the wearer's head. In the current pedal and motorcycle helmet standards, the propensity of a helmet to roll off the head in a cra...

We experimentally demonstrate an exploitation of the nonlinear softening, hardening, and veering phenomena (near crossing), where the frequencies of two vibration modes get close to each other, to realize a bandpass filter of sharp roll off from the passband to the stopband. The concept is demonstrated based on an electrothermally tuned and electrostatically driven MEMS arch resonator operated ...

In the last few years, several DACs have appeared on the market and sold as “upsampling” DACs. Upsampling DAC manufacturers claim that their products improve the sound quality of standard CDs as compared to conventional DACs and most listeners agree. What can possibility account for the improved sound quality? After all, the digital data on the CD is the same no matter what DAC is used to conve...