Although the frequency distance change model for S-wave radiation pattern proposed by Satoh (2002b) has been used in some applications, to achieve more accurate estimation and prediction of high-frequency seismic radiation, a precise frequency- and distance-dependent model for the apparent radiation pattern for both P and S waves is required.
New research demonstrates that, in mice whose brains are under attack by Alzheimer's dementia, exposure to lights that flicker at a precise frequency can right the brain's faulty signaling and energize its immune cells to fight off the disease.
That effectively stiffened the silicon, boosted the square's energy, and allowed it to vibrate at a precise frequency in air, the researchers report in the 30 September issue of Applied Physics Letters.
These coatings are shown to enable scattering reduction at a precise frequency or over a larger frequency band.
As well as being powerful, free-electron lasers have the advantage that they can be tuned to a precise frequency, allowing the beam to be adjusted for different atmospheric conditions.
This shift is generally very small, but at low temperatures it can easily be resolved with a tunable laser that generates a precise frequency of light.
The probe, mounted on a 3-dimensional micromanipulator (model H; Line Tool Co., Allentown PA, USA), is vibrated in solution about 50 µm from the cornea surface by a piezoelectric bender (made in-house) at a precise frequency (usually ∼150 200 Hz).
With the improvement of frequency standard comparison and precise frequency and phase processing technique, the high-precision frequency measurement, phase comparison, phase locked loop and signal processing are necessary.
Furthermore, in this case the precise frequency and direction of the gravitational wave source are known, so scientists know exactly where to look, rather than waiting for rare, large-amplitude events or making statistical inferences about background fluctuations.
The precise frequency and significance of these tissue changes is unknown.
