Re: Strings that can vibrate forever (almost)

On 24/05/2024 12:50 am, john larkin wrote:

On Thu, 23 May 2024 05:08:10 GMT, Jan Panteltje <alien@comet.invalid>
wrote:
 

Strings that can vibrate forever (kind of)
  https://www.sciencedaily.com/releases/2024/05/240522130402.htm
Source:
Delft University of Technology
Summary:
Researchers have engineered string-like resonators capable of vibrating longer at ambient temperature
than any previously known solid-state object -- approaching what is currently only achievable near absolute zero temperatures.
Their study pushes the edge of nanotechnology and machine learning to make some of the world's most sensitive mechanical sensors.
>
Interesting for inertial navigation!
>
Mechanical 214 kHz resonator with a Q of 6.6 billion at room temperature
see paper:
  https://www.nature.com/articles/s41467-024-48183-7
   figure 4
 

It might not have the stability or tempco of a quartz crystal. The SiN
string will surely have a different thermal expansion factor than the
silicon substrate.
 It would be cool to have a worldwide (or even in space) array of
thousands of 3-axis gravitational wave detectors, instead of just
three single-axis sites. We could image g-waves at high resolution.

It's a project in  progress, but the projected launch date is currently 2035. I may survive long enough to see the launch.
https://en.wikipedia.org/wiki/Laser_Interferometer_Space_Antenna
--
Bill Sloman, Sydney