@juandesant@astrodon.social
@juandesant@astrodon.social avatar

juandesant

@juandesant@astrodon.social

PhD in radio astronomy and VO; Joint ALMA Observatory Development Systems Engineer. Previously, Head of Software Product Management and Software Systems Engineer at SKAO (joined March 2014). I have worked for @iaacsic @ESO @almaobs @DataObsCL. He/him.

I try to boost only images with useful/meaningful alt-text. Might unboost after reviewing it…

Avatar: myself looking down, with a “crown” of lamps.

Background: Pen and paper sketch of ALMA by Olivia H. Wilkins.

This is a searchable profile.

This profile is from a federated server and may be incomplete. Browse more on the original instance.

juandesant, to random
@juandesant@astrodon.social avatar

Looking forward to @simon blog post about the latest OpenAI announcements😉

juandesant, to random
@juandesant@astrodon.social avatar

Hi @dansup @dansup, I cannot login to Pixelfed.social since at least yesterday, anything going on?

kottke, to random
@kottke@mastodon.social avatar

A new LoTR movie is coming: Andy Serkis is starring and directing in Lord of the Rings: The Hunt for Gollum. Peter Jackson is producing and Fran Walsh & Philippa Boyens are writing the script. https://variety.com/2024/film/news/lord-of-the-rings-movie-2026-release-warner-bros-1235997102/

juandesant,
@juandesant@astrodon.social avatar

@kottke every time I see a galore of epithets in these press releases I think of ChatGPT… maybe it was as inauthentic before, but now I cannot unsee (unread?) it…

NanoRaptor, to random
@NanoRaptor@bitbang.social avatar

If you like retro displays and simulation and blending now and then fun and prolific output go follow @MrmoTarius - that is all.

juandesant,
@juandesant@astrodon.social avatar

@NanoRaptor @MrmoTarius done, looks like a great recommendation!

kottke, to random
@kottke@mastodon.social avatar

The Sky Was Purple and Red and Yellow and On Fire. I loved the aurora borealis takeover of social media this weekend. Here’s some of the best shots taken by folks all over the world. https://kottke.org/24/05/the-sky-was-purple-and-red-and-yellow-and-on-fire

juandesant,
@juandesant@astrodon.social avatar

@kottke wow, those dutch mills look really nice with that stunning background…

astro_jcm, (edited ) to random
@astro_jcm@mastodon.online avatar

Started boiling some Weißwurst without realising I'm all out of sweet mustard, and stores are closed today. Should I...
(a) Go out and buy mustard in a gas station.
(b) Use sriracha, the only other sauce I happen to have at home right now, and risk being deported from Germany.

juandesant,
@juandesant@astrodon.social avatar

@astro_jcm süsse Senf, bitte!

mdkcore, to random
@mdkcore@hachyderm.io avatar

tar cvJf clothes.tar.xz clothes/

juandesant,
@juandesant@astrodon.social avatar

@mdkcore love the use of the XZ format to represent a “transparent container”…

NanoRaptor, to random
@NanoRaptor@bitbang.social avatar

The one true USB3 connector.

juandesant,
@juandesant@astrodon.social avatar

@NanoRaptor you missed the opportunity to “tobleronerize” it 😉

thomasfuchs, to random
@thomasfuchs@hachyderm.io avatar

Starlink train and also the sky is all weirdly purple for some reason

juandesant,
@juandesant@astrodon.social avatar

@thomasfuchs cosmic reasons!

soviet, to random Spanish

Melinka. Isla Ascensión, Región de Aysén, Chile.

Mi favorita hasta el momento.
Una aurora en toda su magnitud :aaaa:

juandesant,
@juandesant@astrodon.social avatar

@soviet ¡me encanta!

ognimaeb, to physics
@ognimaeb@astrodon.social avatar

Absolutely mind-blown by the incredible #aurora tonight! Phone pictures from my back garden and a nearby field, in Northamptonshire. I have wanted to see this all my life, and never thought I’d manage to catch it. So happy!!! #AuroraBorealis #Physics #NerdAndProud

Picture of the Aurora borealis, seen over the roof of a brick house. There are bright purple and blue streaks from left to right
Picture of an Aurora borealis, with some stars just visible. Pink, purple, and green diagonal, almost vertical streaks. The top of a roof is just visible at the bottom of the picture as a dark silhouette.
Aurora borealis. Vertical, thin purple streaks over a green background, with some red hues on the left, and a few stars. The dark outlines of some trees are visible at the bottom of the picture.

juandesant,
@juandesant@astrodon.social avatar

@ognimaeb stunning!

juandesant, to random
@juandesant@astrodon.social avatar

Is that today's Paranoid Android, or what? He sure does seem not to be having a good time…

juandesant, to random
@juandesant@astrodon.social avatar

Wish I had learned about this sooner… https://www.eventbrite.com/e/build-your-first-python-package-tickets-879586546037

jbzfn, to c64
@jbzfn@mastodon.social avatar

Making 80s Computers Talk | 1980s Commodore Speech Synthesizer | Kari

https://www.youtube.com/watch?v=1ip7K0CaC7Y

juandesant,
@juandesant@astrodon.social avatar

@jbzfn the Currah speech synthesizer also existed for the Spectrum… and of course Macintalk was there from the first Mac. Of course, being 32/16 bit was almost cheating, compared to the other 80's computers…

astro_jcm, to Astro
@astro_jcm@mastodon.online avatar

Me getting mentally ready to be super jealous of the upcoming pics from those of you living at higher latitudes.

juandesant,
@juandesant@astrodon.social avatar

@astro_jcm or you can relocate yourself to a higher latitude ;-)

Aurora borealis seen in a long exposure take near Reykjavik. White clouds are illuminated by the city lights, while several greenish iridescences can be seen in the cloud-free parts. The green light is also reflected over the sea.

juandesant,
@juandesant@astrodon.social avatar

@astro_jcm BTW, are there calculations on how far north the aurora australis would be visible? Not much of a chance with light pollution in Santiago and the current cloud coverage, I guess…

juandesant,
@juandesant@astrodon.social avatar

@astro_jcm thanks for the pointer to NOAA, I got this…

https://www.swpc.noaa.gov/products/aurora-30-minute-forecast

What is the power figure that is shown (peak of ~200 GW), the total energy input from the solar wind, or from the aurora processes themselves?

(Nerd side. note: that is more than 160 times the power required to activate a “flux capacitor”…)

juandesant,
@juandesant@astrodon.social avatar

@lolopb @astro_jcm if you already could see the colours it means it is very powerful… the second photo I posted looked like a greyish moving cloud, and only when I took the long exposure picture (30 seconds) I could see the colours.

For the first photo (the rotated C shape) we could see the colours with our own eyes.

juandesant,
@juandesant@astrodon.social avatar

@lolopb @astro_jcm if you set your iPhone on a tripod (or anything that ensure that the phone is still), you can enable much longer exposures (up to 30 seconds) in night mode… please try that!

My tripod for the aurora pictures was my car, and a boulder, respectively ;-)

juandesant,
@juandesant@astrodon.social avatar

@lolopb @astro_jcm it might not be as powerful, but it should still be visible.

For your Fuji, set it to a high ISO (beyond 3600), wide aperture, and check between 5 and 30 seconds… best of luck!

brucelawson, to random
@brucelawson@vivaldi.net avatar

brb, emailing "You shouldn't need to know all the specifics of web accessibility, Susan. The Agency, however, should. When I had a central heating boiler installed, I didn't say to the gas engineer "I assume this conforms to BS8871, BS 2328 and the Don't Blow Up The Neighbourhood Directive 1993", because I trust that they would know the rules and adhere to them.

Sadly, web agencies don't have the equivalent of CORGI registration."

juandesant,
@juandesant@astrodon.social avatar

@brucelawson thankfully, gas boilers don't have to abide to the "Elastomeric parts for parenterals and for devices for pharmaceutical use” or the “Fork-lift trucks. Hook-on type fork arms and fork arm carriages. Mounting dimensions” dimensions…

(Sorry, you nerd-sniped me there… I actually looked up the Don’t Blow Up The Neighborhood Directive 1993…)

drdrang, to random
@drdrang@fosstodon.org avatar

☃️ With thanks to @kjhealy.
https://leancrew.com/all-this/2024/05/more-than-100-pregnant/

juandesant,
@juandesant@astrodon.social avatar

@drdrang @kjhealy it took me a while to realize that the series is not the probability of the outcome never happening… but that for things that have a 1/n chance of happening on a given time… there is approximately a 1/e probability (bit worse than 1/3) that it will still not have happened after n tries, for n >= 5.

juandesant,
@juandesant@astrodon.social avatar

@drdrang @kjhealy and if you tabulate the first values…

| n | (1 - 1/n)^n |
| 1 | 0 |
| 2 | 1/4 ≈ 0.25|
| 3 | 8/27 ≈ 0.29 |
| 4 | 81/256 ≈ 0.32 |
| 5 | 1024/3125 ≈ 0.33 |

You see that except for the sure case (1/1), the number is between 1/4 and approximately 1/3 of cases where you did not succeed after n tries. That is a lot… and explains things like why many IVF patients are not lucky, or need a lot of tries.

juandesant,
@juandesant@astrodon.social avatar

@drdrang sorry if I did not myself clear.

I was misunderstanding the problem in that way, and found it very counter intuitive that when the number of trials goes to infinity, the convergence was not to one.

What I wanted to say is that for something that has a probability of 1/n with n larger than 2-3, a good approximation for the failure rate after n attempts is 1/3… But if you have more attempts, you have to fix the probability as you indicate in your answer.

juandesant,
@juandesant@astrodon.social avatar

@drdrang Which means that for IVF, which has a typical success rate per attempt between 1/3 and 1/4, after 3-4 trials there is still around 1/3 chance of not succeeding…

I’m afraid the issue is close to my heart, I did the tabulation of [1-(1-Rational(1,3))**x for x in range(1,6+1)] a number of times… and for many reasons we stopped at attempt 2, and I still think it was the best decision.

  • All
  • Subscribed
  • Moderated
  • Favorites
  • •
  • JUstTest
  • mdbf
  • everett
  • osvaldo12
  • magazineikmin
  • thenastyranch
  • rosin
  • normalnudes
  • Youngstown
  • Durango
  • slotface
  • ngwrru68w68
  • kavyap
  • DreamBathrooms
  • tester
  • InstantRegret
  • ethstaker
  • GTA5RPClips
  • tacticalgear
  • Leos
  • anitta
  • modclub
  • khanakhh
  • cubers
  • cisconetworking
  • megavids
  • provamag3
  • lostlight
  • All magazines
    •