Exact uncertainty analysis of the bridge dynamic response during random vehicle crossing by statistical methods par Mir Mohammad Ettefagh, Daniel Behkam Kia

“…As another important result is that the fundamental frequencies of the bridge is less sensitive to the uncertainties of the vehicles' parameters. …”
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Localização sonora em usuários de aparelhos de amplificação sonora individual Sound localization by hearing aid users par Paula Cristina Rodrigues, Aline Cabral de Oliveira, José Fernando Colafêmina, Pedro de Lemos Menezes

“…All subjects were tested with a sound localization device which had three types of square waves with fundamental frequencies at 0.5 kHz, 2 kHz and 4.5 kHz, at 70 dBA. …”
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Some topics in solid state physics par Merrett, T

“…We explain the changes in the above fundamental frequencies, and those of the harmonics, which appear when the crystal is subjected to uniaxial stress. …”