Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Bill Sloman Newsgroups: sci.electronics.design Subject: Re: Strings that can vibrate forever (almost) Date: Fri, 24 May 2024 18:35:22 +1000 Organization: A noiseless patient Spider Lines: 38 Message-ID: References: <1uku4jdb6r5m20nik5ncjrhbls7s68toiu@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Fri, 24 May 2024 10:35:39 +0200 (CEST) Injection-Info: dont-email.me; posting-host="cec2255e2c0bbd723c1df990466fd610"; logging-data="2375451"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+j5MQx3scmkiVTG7sDl0SDpLcBnidbxp4=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:gvNS1IQzSyLJL0t85WzL9lsna9U= In-Reply-To: <1uku4jdb6r5m20nik5ncjrhbls7s68toiu@4ax.com> Content-Language: en-US Bytes: 2572 On 24/05/2024 12:50 am, john larkin wrote: > On Thu, 23 May 2024 05:08:10 GMT, Jan Panteltje > 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