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Finally, a semi-empirical model is derived to predict the extra attenuation peak frequency.
At this particular period, the dense dislocation structure starts to transform to cells, which temporally accompanies long, free dislocations absorbing much ultrasonic energy to produce the attenuation peak.
This study revealed an attenuation peak independent of the applied stress at around 30% of the creep life and a minimum value at 50%.
The result indicated that the stiffened diaphragm improved the smoothness of the sound pressure curve for the speaker, which produced a mid-frequency dip difference (ΔdB) of 1.9 dB and an attenuation peak frequency (fpeak) of 4220 Hz.
For extensive green roofs, a pronounced attenuation peak is found when varying the layer thickness, leading to a maximum reduction of up to 10 dB, relative to an acoustically rigid roof, for the octave band of 1000 Hz.
Similar(55)
Elastic resonances of the beams and acoustic resonances of the cavities can be excited by sound producing several attenuation peaks in the low frequency range.
Such a structural configuration contributes to a significant enhancement in dielectric loss capacity, presenting three main attenuation peaks at the frequencies of 6.6 GHz, 13.5 GHz and 17.1 GHz, respectively.
A straightforward approach in flood management is the attenuation of peak discharges through an appropriate detention system.
To facilitate engineering practice, a series of formulas for evaluating attenuation of peak total stress and pore water pressure are proposed.
It is shown that passive attenuation of peak transient deceleration is possible by coupling the beam to a tuned one-degree-of-freedom (1-dof) oscillator.
It was found that the water-reserved roof has the functions of heat storing, temperature attenuation, and peak temperature appearance time lagging, leading to the reduced roof heat transfer by around 55%.
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CEO of Professional Science Editing for Scientists @ prosciediting.com