Ultrasonic devices oscillate files at 25-30 kHz, producing nodes and antinodes
along the file, whereas sonic devices such as EA operate at lower frequencies of about 1000 to 6000 Hz, so only one node and antinode
occur near the tip (17,18).
The slots must be placed at the antinode
locations, where the electric field reaches its maximum, because the waveguide hosts a standing wave.
The chosen impact position is very close to the antinode
of the first vibrational mode: as a result, this mode is much more energetic than other recorded modes, showing a difference of nearly 40 dB which can intensely affects the optimal performance of modal shapes reconstruction techniques.
of the vibrational shape is selected as the subsequent measurement point.
It is understood that flexural waves generated in the pole would cause it to break at the antinode
, where the curvature is maximum.
A maximum signal, therefore, indicates a pressure antinode
(a displacement node) and a minimum signal indicates a pressure node (a displacement antinode
The cavity length has been chosen to be 1.5 [lambda] with the three quantum wells centered at the antinode
of the laser optical field standing wave and the cavity radius has been taken as 5 [micro]m.
In case of fundamental wavelength there is an antinode
in the middle of the pipe length where the displacement amplitude is maximal.
We can account for proposals of (as regards the antinode
): a collinear spin AF order , an AF quantum critical point [133,134], and a 1D charge stripe order [132,135] with the addition of a smectic phase .
Wu, "Enhancing light outcoupling of organic light-emitting devices by locating emitters around the second antinode
of the reflective metal electrode," Applied Physics Letters, vol.
Figures 4 and 5 show that: (1) in terms of the current amplitudes, each current among [i.sub.1]-[i.sub.8] has both one antinode
and two troughs, which is similar to the characteristics of standing waves; (2) the distribution of the phases of [i.sub.1]-[i.sub.8] suggests that each current distributes along y direction (Figure 3).
This stimulation causes a rhythmic fluttering of the slab, and a friction tip placed at the resonance's antinode
performs a quasi-elliptical nanoscale motion.