2026-05-20T18:33:08Z https://yabu.me Nat Schaeffer https://yabu.me/npub1rk4ghhyew6stdxuguluvay9s0jannpesmy347vwqy259xp04779sqdmacr https://pouet.chapril.org/system/accounts/avatars/109/263/436/998/765/934/original/9be928397893a46c.png https://pouet.chapril.org/system/accounts/avatars/109/263/436/998/765/934/original/9be928397893a46c.png https://yabu.me/nevent1qqsrv28hjzhs4zpxv0szcjwwfn6th9x3d3skv4cedprky9tgceqycjszyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmckgc720v In reply to <a href='/nevent1qqs9lely9tsxs58lz843cjc97mvt5jry4cfhxz5u5w833qwxfsk3tfcxm6gfx'>nevent1q…6gfx</a><br/>_________________________<br/><br/>which does not mean F is the smallest Lagrange number ? 2026-05-10T00:51:44Z https://yabu.me/nevent1qqs0yj4hk7at40smtv0p4c40m8j70uehexllwklnxnqax28y8gxwg9czyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmckwc0jhk In reply to <a href='/nevent1qqsw822r49rp8mzecwad7czekhunrlt0yhzxz64j6juvqn28pqm5tdq20ydlt'>nevent1q…ydlt</a><br/>_________________________<br/><br/>sorry, I&#39;m lost :<br/>You say &#34;the golden ratio has the smallest possible Lagrange number, namely √5&#34;, yet F &gt; sqrt(5)...<br/>And you also say, &#34;F is a Lagrange number and F is the smallest with this property&#34; (I understand &#39;this property&#39; to be &#39;a lagrange number&#39;).<br/>What did I misunderstand? 2026-05-09T22:21:10Z https://yabu.me/nevent1qqs8s0uupm42m4dvtwqrnwdtxvw90ttqtqyxaytevs4e6z8wmh23e2szyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmckzaxrll A stably sratified layer can lead to magnetic field generation ! This is what we show in a new paper, accepted for publication :<br/><a href="https://arxiv.org/abs/2506.18521">https://arxiv.org/abs/2506.18521</a><br/>#astrophysics <br/>The stable layer is prone to double-diffusive unstability, which reconfigures the stable layer into 2 regions, one very stable, and one convective. 2025-09-08T19:42:38Z https://yabu.me/nevent1qqsf50f8n4my9saadrxmqx5araucntv2awmqf6eu2ykk8j0509ky27czyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmckfsha38 In reply to <a href='/nevent1qqspq3q528jzktc8tusxdhuwxgkxt80lyy4mfjvz9tmpykrsu6jut0q4w9e0c'>nevent1q…9e0c</a><br/>_________________________<br/><br/>why is an infrared filter useful to reduce atmospheric turbulence ? 2025-01-15T21:10:29Z https://yabu.me/nevent1qqsp4g0jqwpvlp09jm9fu5hxyc0788v0xtmefvp3zfvpnwp8jw2r9agzyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmckje56vj In reply to <a href='/nevent1qqswkrlapgcvwjjue30hw070edvxlqvxl69gjpnu0mf5tlms87np2jsjp9tca'>nevent1q…9tca</a><br/>_________________________<br/><br/>ok, I&#39;m a bit disapointed because nobody seems to like liquid metals here!<br/>While they are not plasmas they obey the MHD equations. They would lie somewhere near the P and Q of &#34;Quantum Plasmas&#34; or a little bit below. 2025-01-09T09:49:48Z https://yabu.me/nevent1qqszfltva02zmyxq37nwxplgmwmlfw2xdr0z7sej9zg4lhez7zw6mhszyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmckze0mee In reply to <a href='/nevent1qqswypnhg5xquztmv2u8ac3a67yrcev0mmy4lfaefq3vfqucdgpylts3wsz7d'>nevent1q…sz7d</a><br/>_________________________<br/><br/>it is because the fluid/plasma will respond to this force and move accordingly.<br/>Then, the induction equation tells you that B is advected by the flow just as if it were material lines, and hence will evolve towards &#34;straight lines&#34;. 2024-12-26T22:10:04Z https://yabu.me/nevent1qqs95tyukczsv3jshga4t28v7cdyk7a8e0a7txy4lkz95lnhfz34rfszyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmckxqcrzp In reply to <a href='/nevent1qqsgf9pauf2ugn6rh2cwnj6nzgk3x9sur2s0z5tp063xlvg9eyzn8zctt0e8v'>nevent1q…0e8v</a><br/>_________________________<br/><br/>try skred. No phone number or email needed. I find it easy to use.<br/>Super secure, and not from the US.<br/><br/><a href="https://www.skred.app">https://www.skred.app</a> 2024-11-06T20:58:36Z https://yabu.me/nevent1qqsxe2307wqvn7jrufyy7rpgxn8l3wwm6y9np5mpsd07jqfeys49htczyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmck7xw44q In reply to <a href='/nevent1qqsx4dw4v6deutadgjg3h3xkvt9qk0z4dy9rkjsswrdyzpru0prfdrckrlysv'>nevent1q…lysv</a><br/>_________________________<br/><br/>may I point out an obvious bias? Those who have knee problems do not bike so much, because ... of their knee problem.<br/><br/>Same for dose-response: you stop biking because of knee problems... 2024-10-29T19:57:31Z https://yabu.me/nevent1qqs9c8enmqwnhnae56w6e2atj3phejh6eh06aehdq0z9mcnrldhu02qzyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmckam2kc8 In reply to <a href='/nevent1qqsfpc69tuy3khjlqqjp0g43s58xdm5sgl7vvc64g886gzlv6jg8n9gstxhnm'>nevent1q…xhnm</a><br/>_________________________<br/><br/>so my question is: what is the carbon intensity of solar power + 4-8 hours battery backup ?<br/>Without battery backup it is already around 40 gCO2/kWh, which is 4x wind and 10x nuclear. 2024-08-02T12:43:01Z https://yabu.me/nevent1qqs8furwxg4pmuadqlc89vk74hlfzwpa62tvenl53mgcdmkg97gcfhgzyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmck3v7dqv In reply to <a href='/nevent1qqsvkn0323hqv2vse5jvxg9prtg9jzzky8xx4vny97w72prj982kplc9scx7j'>nevent1q…cx7j</a><br/>_________________________<br/><br/>so you have 2 hours of solar power that can be stored on batteries ? How does that make a difference in:<br/>1) satisfying power demand<br/>2) carbon footprint of the whole system<br/><br/>For 1) it probably allows to use less fossils for the peak of daily demand.<br/>For 2) it will have a negative impact at the fabrication level. Can 1) be enough to offset 2) completely? I don&#39;t know. <br/>Anyway, 2h of battery backup does not help the seasonal problem at all... 2024-08-02T08:25:19Z https://yabu.me/nevent1qqsx3mdumzectk0mjfee38darlqkau5xupr6te6ejhwe6lfqej4zumgzyqw64z7un9m2pd5m3rnl3n5skp7tkwv8xrvjxhe3cq32s5c97hmckpnhgt8 In reply to <a href='/nevent1qqs2kn6erm3j9h867f5lvz9nghn00geve0umyce3vflc9n6rw7y5xyqv0ds3t'>nevent1q…ds3t</a><br/>_________________________<br/><br/>What does &#34;battery capacity to the tune of 10% of their maximum output&#34; mean?<br/>Battery capacity = energy (e.g. in Wh); power output is power (in W).<br/><br/>So is it 10% of annual energy output? Daily output? These are VERY different.<br/><br/>Solar electricity may be interesting because of a relatively low carbon footprint (although around 4x larger than wind and 10x larger than nuclear).<br/>Adding batteries increases carbon footprint a lot. 2024-08-01T23:15:49Z