Very sad that the #anime hashtag (and possibly others) is now being spammed by posts that all look like this:
[link] [something within square brackets] Japanese text, many hashtags
picture
Unfortunately they seem to come from different servers, not just one. Has anyone found a way to filter them out? Or am I the only one annoyed by this?
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Edit: simply blocking the domain bsky.brid.gy seems to work.
I wonder if there's a way to avoid seeing posts from people bridging from Bluesky or whatever it's called. Is it enough to mute or block "@bsky.brid.gy"?
[#]rstats #emacs #fediverse
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Does anyone have some interesting references or reviews about the "method" of multipole expansion, typically used in electromagnetism and astrophysics, but from a purely mathematical point of view? Cheers! #mathematics #maths
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New One Punch Man (redraw) chapter out!
https://cubari.moe/read/gist/OPM/210/1/
Check out also the great extra material in chapter 162.5:
https://cubari.moe/read/gist/OPM/162-5/1/
(and it goes without saying: buy these volumes at your nearest manga store, as they become available 😍 )
[#]onepunchman #manga
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NASA Rocket Engine Fireplace
https://plus.nasa.gov/video/nasa-rocket-engine-fireplace/
[#]nasa #science #holiday
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Following users / following hashtags:
Pros & cons of each?
[#]mastodon
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Let me try a little physics riddle here on Mastodon. This riddle is really meant as a moment of self-reflection for physics teachers (in particular I invite you to compare what answers you'd give within Relativity Theory)
We're in the context of Newtonian mechanics.
There are three small bodies. In the inertial coordinate system (t, x, y, z), we know the following about the three bodies (at a given instant of time):
Now consider a new coordinate system (t', x', y', z') related to the first by a Galileian boost:
t' = t, x' = x – u⋅t, y' = y, z' = z
with u = 1 m/s
Questions:
Can you give definite answers to these three questions, and motivate your answers with simple physical principles? Note that by "definite answer" I don't necessarily mean an answer with a definite numerical value.
[#]physics #physicseducation #physicsed #science #scienceeducation #mechanics
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Dear Fediversians! Does any of you know if in Japanese and Chinese the term for the physical quantity "momentum" literally translates to "quantity of motion"? This is the case in many languages, for instance Spanish ("cantidad de movimiento"), French ("quantité de mouvement"), Italian ("quantità di moto"), Swedish ("rörelsemäng").
Edit: maybe the creators of the great https://jisho.org have an answer about Japanese? @jisho
Cheers!
[#]physics #japanese #chinese
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"A 15-minute intro to involute gears"
"Involute gears are everywhere: toys, kitchen appliances, cars. But what's so special about their shape?"
https://lcamtuf.substack.com/p/a-15-minute-intro-to-involute-gears
[#]physics #science #scienceeducation
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Just stumbled for the first time on this collection of diamond-open-access journals, SciPost:
https://scipost.org/
It looks like a great initiative! Sharing just in case you have never heard of it either or in case you have something to share about it.
[#]physics #publishing #openaccess #science #academia
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Happy birthday, Italo Calvino! 🎂 🎂 🎉 🎉 📖 ✍️ ❤️
https://english.elpais.com/culture/2023-10-14/italo-calvino-the-writer-who-shrank-the-size-of-hell.html
https://www.nypl.org/blog/2023/10/11/where-start-italo-calvino
https://italocalvino.org/
[#]italocalvino #literature
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Looks like the Nobel Prize committee has forgotten what Physics is.
[#]physics #NobelPrize
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Dear fellow physics teachers (especially of continuum-mechanics-related disciplines): do you have any suggestions, thoughts, personal experiences, and references about nice graphical representations of the flux of a vector quantity – for instance momentum flux (in momentum transport)?
Cheers!
PS: what tags can be good & appropriate for a request like the present one?
[#]physicseducation #physics #continuummechanics #fluidmechanics #AAPT
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Happy birthday, Buster! 🎂 💪 🎬 ❤️
https://www.youtube.com/watch?v=mlh9g2876-Y
https://www.youtube.com/watch?v=IT6M5Qgg2cY
[#]busterkeaton #cinema #stuntmen
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We have a paper that tries to introduce clinicians (and people working with machine learning), in a very friendly way and with a concrete example, to Bayesian methods. More precisely to "Bayesian nonparametric population inference" (also called "nonparametric exchangeable inference" or "nonparametric density regression"):
https://doi.org/10.31219/osf.io/8nr56
The paper guides the clinician from the hypothetical problem of predicting Alzheimer onset in four patients, given some predictors from each patient and previous trials, to the (again hypothetical) problem of deciding upon a treatment.
This method allows for a quantitative and yet intuitively understandable assessment of hypotheses, even when the hypotheses come in degrees rather than as artificial binary pairs. And it has further advantages:
The text is addressed to clinicians, statisticians, and researchers in machine learning. The emphasis is on the understanding of the ideas involved, rather than on the maths.
If you have the time to take a look and if you find it valuable, then I'd be thankful if you boosted this reach-out post. Also happy to receive comments about unclear passages and errors of course.
Cheers!
[#]bayesian #statistics #clinicaltrials #medicaldecisionmaking #medicine #rstats #MachineLearning
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Dear #Emacs and #ESS and #eglot users, I wonder if I can have your help:
I work on R files with ESS. I wanted to try eglot's functionality, so I installed the R package languageserver (https://cran.r-project.org/package=languageserver) and activated eglot (M-x eglot).
After some use, I decided it isn't for me right now (I'd need to spend too much time on customization). So I shut down the eglot server with M-x eglot-shutdown.
But now I see that whenever I visit a .R file, the eglot-like "linter" annotations and syntax highlighting are on. Yet if I invoke M-x eglot-shutdown I get the message "[eglot] No servers!". In order to make the highlighting go away, I have to start the eglot server and then shut it down.
So what is going on? Is ESS somehow calling the languageserver functionality? Or is there some customization I should do? I don't see customization options related to ESS and language servers. Or is this a bug?
Thank you for your hints! 🙏
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https://www.lieffcabraser.com/antitrust/academic-journals/
https://www.forbes.com/sites/michaeltnietzel/2024/09/16/scientists-file-antitrust-lawsuit-against-six-journal-publishers/
https://www.reuters.com/legal/litigation/academic-publishers-face-class-action-over-peer-review-pay-other-restrictions-2024-09-13/
"On September 12, 2024, Lieff Cabraser and co-counsel at Justice Catalyst Law filed a federal antitrust lawsuit against six commercial publishers of academic journals, including Elsevier, Springer Nature, Taylor and Francis, Sage, Wiley, and Wolters Kluwer, on behalf of a proposed class of scientists and scholars who provided manuscripts or peer review, alleging that these publishers conspired to unlawfully appropriate billions of dollars that would otherwise have funded scientific research."
"Deutsche Bank aptly describes the Scheme as a “bizarre” “triple pay system” whereby “the state funds most of the research, pays the salaries of most of those checking the quality of the research, and then buys most of the published product.”"
[#]academia #paywall #publishing #science
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Question on combination of semi-transparent colours in plots:
If I plot a line or rectangle, say in blue, and then another one on top in red, then I'll only see the red one.
If I use transparent colours, then I'll be partly able to see the blue line beneath.
My question: which opacity (alpha) value should one use so that the result is "commutative"? that is, so that visually I see the same if I first plot the transparent-blue and then the transparent-red, or vice versa? Would an alpha=0.5 achieve this?
And what if I have three colours? Is there an alpha that would give the same visual result regardless of the permutation?
I'll do some visual experiments to check this, but I'm grateful to anyone who could point me to some work where the mechanics behind this and its result are explained :)
Cheers!
[#]rstats
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Looks like #Emacs 30.0.90 is out!
https://git.savannah.gnu.org/cgit/emacs.git/
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When reporting a credibility interval, maybe also you, like I, are sometimes undecided between a 95%, a 90%, and an 89% interval (the last is common in the Bayesian literature). Well it turns out that the 89% interval has the following special property – for what it's worth:
Knowing whether the true value is within or without the 89% interval, corresponds to almost exactly 0.5 shannons of uncertainty (more precisely 0.4999 Sh). That is, the uncertainty is half that of a 50% credibility interval, measured on the log-scale of Shannon information.
The 90% interval corresponds to 0.469 Sh. The 95% one, to 0.286 Sh.
So if one reports 50% and 89% credibility intervals, one is reporting 1 Sh and 0.5 Sh of uncertainty.
The remarks above don't pretend to be more than a curiosity :)
[#]probability #bayes #informationtheory #rstats
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