When researchers put two fish in an unfamiliar tank or used a field-emitting dummy to mimic an intruder in a fish's home tank, both males and females tended to raise their electric-field frequencies
as they attacked.
The average bad part frequency is lower because of the reduced stiffness, but a few bad castings have higher frequencies
because the defect (a large shrink porosity) reduced the component's mass.
The high durometer polychloroprene may last longer due to its high modulus, but at high frequencies
it becomes stiffer.
In five of these seven ears, DPOAE amplitudes were significantly above the noise floor at 500 Hz, 750 Hz, and 1 kHz and below the noise floor at the higher frequencies
For example, cell phones can use frequencies
between 800 and 900 megahertz (a unit of frequency measurement).
The few birds that can echolocate use lower frequencies
, and they do so only to navigate in the dark, says J.
It is clear that the physical sound pressure is concentrated at low frequency, and we can assume that the forces through the bushings are largest at low frequencies
An octave is a doubling of frequency; there are six octaves between 125-4000 Hz, with center frequencies
of 125, 250, 500, 1000, 2000 and 4000 Hz.
Vectron International is a world leader in the design, manufacture and marketing of Frequency Control, Sensor, and Hybrid Product solutions using the very latest techniques in both bulk acoustic wave (BAW) and surface acoustic wave (SAW) based designs from DC to microwave frequencies
During the last 2 years, this time scale has been used to evaluate the relative frequencies
of NIST-7, an optically pumped cesium-beam standard, and NIST-F1, the cesium-fountain frequency standard.
The remarkable spectrum exiting the fiber, when applied as a sort of ruler, takes the ordeal out of measuring visible-light frequencies
However, balancing heat dissipation and performance characteristics in high frequencies
is a critical issue with GaAs, and is reaching to the point that the material is fast approaching the upper limits.
The comb concept, developed at the Max Planck Institute in Germany, provides a large set of equally spaced frequencies
that can be used, almost like a ruler, to make measurements of very large frequency differences, in this case a difference of 76 THz.
Virtually any strong source of radio waves can cause interference if its signals stray too near the frequencies
at which scientists are observing.
For the three test conditions, measured natural frequencies
occur at approximately 28 Hz, 40 Hz and 70 Hz for shear strains of .