Ultrasound waves are propagated in upper frequencies from the limit of human hearing and have lower wavelength and more attenuation coefficient.
In upper frequencies, load dependent effects were predominately positive and were most pronounced in the gamma band, i.e. in the MPFC, right SPL, and left DLPFC.
It gives good attenuation of ambient noise in the upper frequency band and some how medium protection in below 500 Hz.
Of the remaining 56 subcarriers, 28 are null in the lower frequency guard band while 27 are nulled in the upper frequency guard band and one is the central DC null subcarrier.
Of the remaining 56 subcarriers, 28 are null in the lower frequency guard band while 27 are nulled in the upper frequency guard band and one is the central DC null subcarrier ([25],p. 429).
Of the other 56 subcarriers, 28 subcarriers are null in the lower-frequency guard band, 27 subcarriers are nulled in the upper frequency guard band, and one is the central null (DC) subcarrier.
No significant interaction was found in the lower (F1,18 = 0.43, P = 0.5), or in the upper frequency band (F1,18 = 0.01, P = 0.9), demonstrating that the entrainment of the endogenous neural oscillations was restricted to the specific tACS frequency.
Furthermore it was ascertained that the levels generated by a locomotive in the upper frequency range are similar to those produced by damped coach wheels.
The reference scenario is defined by the system parameters corresponding to the standardized 802.15.4 MAC default values in the upper frequency band 2.4 GHz at the fixed data rate 250 Kb/s [3].
