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NNTP-Posting-Date: Thu, 23 May 2024 14:50:37 +0000
From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Strings that can vibrate forever (almost)
Date: Thu, 23 May 2024 07:50:37 -0700
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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.