@j_bertolotti@mathstodon.xyz
@j_bertolotti@mathstodon.xyz avatar

j_bertolotti

@j_bertolotti@mathstodon.xyz

Associated Professor of Physics at the University of Exeter.
Scientific visualizations (grouped under the hastag #PhysicsFactlet).
He/lui/on. All opinions are my own fault.

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j_bertolotti, to random
@j_bertolotti@mathstodon.xyz avatar

On one hand Mathematical notation is arbitrary, and if you properly define what you mean by a term/symbol, you can choose whatever you want.
On the other hand any time you use terminology or notation with a meaning different from the usually accepted one, you are putting a lot of unnecessary cognitive burden on the reader.
And it is the reader's right to just decide the effort of understanding you is just not worth it.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@robinadams Which shows that people doing Maths and people doing Philosophy are usually interested in different questions.

j_bertolotti,
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@franco_vazza I mean, plenty of people ready to defend natural units, so I guess that one is a lost battle 🤷‍♂️

franco_vazza, to Astro
@franco_vazza@mastodon.social avatar


This small observational/theoretical review about the seeding of cosmic ray electrons by cluster radio galaxies by myself and Andrea Botteon just got accepted

https://arxiv.org/abs/2403.16068

I described it briefly in this past thread:
https://mastodon.social/

I think it's a good one overall, and helpful "to the community".
It only has the big fault of being published by MDPI Galaxies, what do you think?

Opinion poll below:⬇️

image/png
image/png

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@franco_vazza Bad idea. For the same reason as it is a bad idea to publish with Elsevier even if 0.1% of their journals are good.

eb, to random
@eb@social.coop avatar

What’s wrong babe? You’ve hardly created any shareholder value today

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@eb Sorry, I got confused and used all of my stock to make a risotto.

amberage, to random
@amberage@eldritch.cafe avatar

question from a complete novice:

I was trying to iron a crease into my chinos and I just couldn't get them to line up nicely. I laid side seam on side seam for both legs, but from the knee upwards, the legs wouldn't lie flat and the crease I ended up ironing was wobbly at best.

What am I doing wrong? How do I do that better?

I iron on a table (with a heat-resistant ironing blanket underneath), not a board, if that's relevant.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@amberage Maybe silly question: are these well-worn throusers? Because well-worn chinos tend to deform a bit on the knees and not lie flat anymore.

eniko, to random
@eniko@peoplemaking.games avatar

has anyone made an isometric dark souls clone yet

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@eniko If I had any skill in making games I would probably make a hybrid between FF tactics and Dark Souls.
(Disclaimer: It is probably a good thing I have a job that has nothing to do with making games.)

j_bertolotti, to random
@j_bertolotti@mathstodon.xyz avatar

Targeted advertisement: I will steal all of your data to make a profile of you so accurate we will know you better than yourself. And then we will manipulate you into giving us all of your money 😈

Also targeted advertisement: I see you just bought a washing machine. Here is the adverto for another washing machine, just in case you want a second one 🤪

fullfathomfive, to random
@fullfathomfive@aus.social avatar

jk rowling: there are only four types of people in the world - smart, brave, evil and miscellaneous. a magic hat tells you which one you are when you are 11 years old, and it will never change

harry potter fan: omg i'm such a miscellaneous

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@benroyce
As much as I liked Ender's Game, it was not exactly full of people treated decently.
@fullfathomfive

carnage4life, to random
@carnage4life@mas.to avatar

Ghost kitchens seem like a great idea in theory but in practice they found out that cooking food doesn’t scale like software.

Chain restaurants that ran them on the side during the pandemic became overworked serving both delivery and in-person customers so quality suffered.

On the other hand, brands that only existed in apps like Uber Eats while cooking out of some warehouse had such low quality users learned to avoid them.

Another trend that was a COVID phenomenon

https://www.nytimes.com/2024/04/12/business/ghost-kitchens-restaurants-pandemic.html?ugrp=m&unlocked_article_code=1.kk0.KQpV.--bnyk3G2KfO&smid=url-share

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@carnage4life Ok, I read "ghost chickens" three times in a row, and I was a little bit disappointed when I finally read it properly 🤣

j_bertolotti, (edited ) to random
@j_bertolotti@mathstodon.xyz avatar

Through the years I made a LOT of scientific visualizations (), and lately I ran out of steam.
To get some motivation back I decided to go through a standard undergrad Physics textbook and try to create as many visualizations as I can for it.
Should I go for:

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@MotionMountain Just to say that I have already done a bunch of wavefunctions animations.

j_bertolotti,
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It looks like I will go (slowly) through Ashcroft/Mermin, making at least a few animation per chapter, to try to help visualizing some of the concepts.

j_bertolotti, to random
@j_bertolotti@mathstodon.xyz avatar

Context: "The Incredible Machine" was one of the greatest games ever made.
(This is a statement of facts and not subject to discussion.)

Now has made something almost as fun that runs in a tab of your browser: https://xkcd.com/2916

j_bertolotti, (edited ) to random
@j_bertolotti@mathstodon.xyz avatar

Advice for anyone designing airports: if you don't want me to bring liquids on the plane (which btw is a silly rule) you also provide a place where to empty my bottles before the controls.
Or you get water in your bins. Your choice.

atomicpoet, to random
@atomicpoet@atomicpoet.org avatar

Just bought the Middle-Earth Shadow Bundle on Steam. It includes:

  • Middle-Earth: Shadow of War
  • Middle-Earth: Shadow of War Expansion Pass
  • Middle-Earth: Shadow of Modor
  • Middle-Earth: Shadow of Modor GOTY Edition Upgrade

The price of each of these individual items is $112.96. But today, I’m paying C$8.99.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@c0dec0dec0de
I suspect I am one of the few who was utterly unimpressed with the nemesis system. It largely boiled down to die to a random goon because of a silly mistake (and because I can't aim), have them come back later to hunt me and get slaughtered in seconds (the hand-to-hand combat is very forgiving once you get the basics).

@atomicpoet

kerstinsailer, to random
@kerstinsailer@sciences.social avatar

Tomorrow I'll set off on my first conference travel since 2019 to Switzerland.
In the 2010s I went to 3-4 conferences a year (and greatly enjoyed it) then the pandemic and put things to a grinding halt.
Hoping my energy management and pacing regime will work but also excited to see old conference buddies again and learn about new research.
Also excited about the train journey (including the scenic Gotthard route)

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@kerstinsailer Uni of Exeter wants me to book via their portal, which is ok for national train travels. But trying to book a train that will cross the border (let alone a train in a different country) is a madness-inducing experience ☹️

sfera314, to random
@sfera314@mathstodon.xyz avatar

Atrocious doubt: I need some help.

Two identical homogeneous planets (same mass) orbit around a star with the same circular orbit (r1=r2).
Planet 1 has no spin (1 day = 1 year) whilst planet 2 has some spin (such that, say, 1 day = 1/365 year).
With this information what can be said about the planet's orbital speed around the star? (v1>v2, v1=v2 or v1<v2)?

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@sfera314 Quick guess without thinking too much: the spin and orbital dynamics are decoupled, so the two planets move ar the very same speed.

j_bertolotti, to physics
@j_bertolotti@mathstodon.xyz avatar

Refraction

j_bertolotti, to physics
@j_bertolotti@mathstodon.xyz avatar

Thinking more and more seriously that I should create a "Tutorials in Physics" journal that doesn't publish new research, but tutorials on advanced but relatively settled topics, aimed at first year PhD students who need an introduction to the topic.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@Thcoudreau Only partially. A review and a tutorial are not the same thing.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@Rycaut You need to have a target audience in mind when you write. Which doesn't preclude what you write to be interesting to more people.

j_bertolotti, to random
@j_bertolotti@mathstodon.xyz avatar
carnage4life, to random
@carnage4life@mas.to avatar

A bunch of gamers in France are trying to get regulators to stop game companies from shutting down online games after a few years.

They argue that they bought a good that the seller has rendered inoperable not a service.

This won’t work. You can’t force companies to maintain online services forever.

https://www.pcgamer.com/gaming-industry/stop-killing-games-campaign/

j_bertolotti,
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@carnage4life As others have said: just give people the code necessary to run their own servers.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@carnage4life From the article linked: "Scott isn't asking developers to operate game servers until the heat death of the universe, suggesting a compromise: When a developer has decided to stop supporting a game, it should furnish owners with some way to keep playing—usually that'd be private server support—with the understanding that some features may be lost in the transition."

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