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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Strings that can vibrate forever (almost)
Date: Fri, 24 May 2024 18:35:22 +1000
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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