Research on developing a harvesting system that converts the low frequency, non-periodic, and low-acceleration vibrations present on bridges is continued and significantly extended in this work.
To enable low frequency non-destructive testing of honeycombs, it is instrumental first to characterize their sub-ultrasound wave propagation and dispersion characteristics.
From its beginning in the early 1930s, the LFR was augmented with Low Frequency Non-directional beacons (NDBs), which were simple, single-antenna transmitters, whose radio emission pattern was uniform in all directions in the horizontal plane.
In Experiment 1, the targets were low frequency non-dominant stress words and nonwords.
The effect on low frequency non-dominant words was not significant (t<1).
In each list there were 7 low frequency dominant consistent and 7 low frequency non-dominant inconsistent word targets.
In each list there were 7 low frequency dominant stress word targets, and 7 low frequency non-dominant stress word targets.
Thus, in Experiment 3 high and low frequency non-dominant stress words were presented primed by words and nonwords with the same stress (see Table 2).
Low frequency dominant stress word targets were faster (30 ms) when primed by non words, compared to when primed by low frequency non-dominant stress words, [t1 35) = 2.72, p<.05; t2 (82) = 1.92, p = . 06].
Each participant was assigned one block constructed from the two lists, one with words with non-dominant stress as primes and 7 low frequency non-dominant stress words and 7 low frequency dominant stress word targets, the second with nonword primes and a different set, but the same number, of non-dominant and dominant words as targets.
Therefore, relatively low frequency non-stationarities were filtered using Empirical Mode Decomposition [ 29, 30].
