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It employs a magnetic tuning technique to realize the double tuning ability at the same time including the operating frequency tuning and the coupling effect tuning.
To attenuate these vibrations, the Department of MEMC at the VUB has developed a dynamic vibration absorber called the Double Tuned Rail Damper (DTRD).
The rotational inertial double tuned mass damper (RIDTMD) is a type of passive mass damper which includes a physical mass as well as a rotational mass.
The ac shunt passive filter group is located between the converter transformer and the converter reactor, comprised of a high-pass filter to filter out the harmonics at frequencies higher than the carrier frequency and a double tuned filter to filter 5th and the harmonic at twice carrier frequency of the VSC.
The double tuned mass dampers (DTMD), consisting of one larger mass block (i.e. one larger tuned mass damper (TMD)) and one smaller mass block (i.e. one smaller TMD), have been proposed to seek for the mass dampers with high effectiveness and robustness for the reduction of the undesirable vibrations of structures under the ground acceleration.
Unlike staggered tuning, double tuning usually tunes both resonators to the same resonant frequency.
An alternative to double tuning that avoids this loss of bandwidth is staggered tuning.
However, staggered tuning requires more stages and has lower gain than double tuning.
Double tuning, as compared to single tuning, has the effect of widening the bandwidth of the amplifier and steepening the skirt of the response.
A folded four-ring quadrature birdcage coil was designed and constructed with a double-tune configuration of an outer high-pass coil for 1H (400 MHz) and inner low-pass coil for 23Na (105.72 MHz at 9.4 T).
The modern version has four to six main melodic strings, plus two to four others; some of the strings may be paired in double courses tuned in unison or at the octave.
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