@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.

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

eniko, to random
@eniko@peoplemaking.games avatar

ive gotten enough practice at kitsune tails during development that maybe i'll speedrun it for a while after it launches

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@eniko As long as you don't use glitches you purposefully left in the game to get your speedrunning times better, I'd say that you should definitively run it, and put your runs somewhere where I can watch them 🙂

seamsay, to physics
@seamsay@mathstodon.xyz avatar

Anyone on mathstodon got a better answer to this question? I feel like somebody could do better than I did.

https://aus.social/

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@seamsay Already several good answers in that thread. Doesn't seem worthwhile to go and add one more.

j_bertolotti, to random
@j_bertolotti@mathstodon.xyz avatar

: The "Ashcroft/Mermin Project"
I will try to (likely very slowly) go through the classic textbook "Solid State Physics" by Ashcroft and Mermin and make one or more animation/visualization per chapter.
This will (hopefully) help people digest the topic and/or be useful to lecturers who are teaching about it. As with all my animations, feel free to use them.
The idea is that the animations are a companion to the book, so I will give only very brief explanations here.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

#PhysicsFactlet: The "Ashcroft/Mermin Project" Chapter 4: Crystal Lattices
Once we have the Bravais lattice, we can fully describe a crystal structure by specifying how the atoms are arranged around the lattice points (i.e. the "basis").

2D representation of how to combine a Bravais lattice and a basis to form a crystal structure. On the left the Bravais lattice (small gray dots) starts as a square lattice and becomes a triangular one. In the middle the basis (black dots), that starts as a single "atom", changes into two atoms, and then three atoms. On the right the resulting crystal structures.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

Released into the and uploaded to together with the script used to generate it: https://commons.wikimedia.org/wiki/File:Crystal_Structure_as_Lattice_and_Basis.gif

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

Released into the and uploaded to together with the script used to generate it: https://commons.wikimedia.org/wiki/File:Ashcroft-Reciprocal_Lattice.gif

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

: The "Ashcroft/Mermin Project" Chapter 5: The reciprocal lattice
The "reciprocal" of a Bravais lattice is the set of k-vectors that yield a plane wave with the same periodicity of the Bravais lattice (i.e. effectively the Fourier transform of the lattice).

On the left a Bravais lattice (initially cubic) shown as grey spheres, and on the right its reciprocal lattice. The bRavais lattice is gradually deformed, showing how the reciprocal lattice changes with it.

j_bertolotti, to machinelearning
@j_bertolotti@mathstodon.xyz avatar

If you are looking for a #PhD and are interested in working on #OpticalComputing for #MachineLearning (and to spend some time in the UK and some time in Australia), contact me!
Got the funding but the official advert is not out yet. Will update when it is (but the deadlines are going to be short).

j_bertolotti, to random
@j_bertolotti@mathstodon.xyz avatar

#VideoGameReview
A few days back I finished #Spiritfarer, and I have opinions.
If you don't know it, Spiritfarer is a 2020 resource management game with some platforming element. The general idea is that you are in a sort of land of the dead, and have to collect the spirits of the departed and take care of them until they feel ready to move on.
Let's start with the positives: this is 100% a "cosy" game with essentially no penalty for failing anything beside the time it takes to try again. It is also beautifully drawn and animated, and the idea that you have to keep piling weirdly shaped buildings on your boat gives it a very distinctive vibe.
Despite the fact that there are a large number of largely anonymous souls "living" in the archipelago the game is set in, you only help a relatively small number, and each of them has a well defined story and personality. The idea is that by the time you finally bring them to the "everdoor", you got attached to them and their departure feels emotional. Does it work? It depends. The souls cover a wide spectrum, and different people will resonate with some and not resonate with other. I personally only really felt for two of them (an old kind lady developing dementia and a young kid), but I understand that different people might get attached to different characters.
The moment to moment gameplay is largely about collecting resources, so you can build stuff that allows you to collect more and different resources. It is not a very original game loop, but it is well done and it works. For about half of the game.
Problem is, while you bring more souls to the everdoor, you have fewer souls to attend to, and after a while you find yourself with a ton of pointless stuff.

toddo, to random
@toddo@sfba.social avatar

One thing: I really wish the MSM would stop saying "hush money to a porn star" and "cover up an affair". He was convicted of ELECTIONS FRAUD. This matters. Having sex (barely consensual if it all) with a porn actor is NOT illegal, nor is lying about it to your wife. Spending campaign money to influence an election by manipulation of information and the media: Illegal. This is about elections and core democratic principles.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@thisisskaly
Let me guess: you didn't read the post before commenting.
@toddo

NanoRaptor, to random
@NanoRaptor@bitbang.social avatar

What are some numbers in your field that anyone else in the field would identify without even thinking about it, but folk outside may have no idea. Just the numbers, no explanations. Yet.

105 148 210 297 420 594 841 1189

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@NanoRaptor
1/137

vicgrinberg, to random
@vicgrinberg@mastodon.social avatar

I'm amazed by folks who have orderly office cupboard. This is my variant of as cleaned up as it gets 😅

#AboutToday

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@vicgrinberg Spoiler: that is clean and ordered enough to be a photo in a furniture catalogue 😜

lisyarus, to random
@lisyarus@mastodon.gamedev.place avatar

In other news, made an icosahedron from coloured magnets

image/jpeg

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@lisyarus Fiddling with those things is so addictive I could never stop long enough to actually make a pattern more complicated than a cube 🤣

MissingThePt, to random
@MissingThePt@mastodon.social avatar

You’ll have to pry my American paper out of my cold, dead hands.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@MissingThePt To be fully honest, we are very happy for you to keep it.

QuantumWitch, to pixelart
@QuantumWitch@mastodon.gamedev.place avatar

Ren finds a spooky place, in Quantum Witch

#indiegame #indiedev #pixelart

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@QuantumWitch Is that witch really quantum? 🤔
oTheirJob 🙃

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@QuantumWitch Maybe if nobody is looking at her she gets delocalized and spread all over the screen? 🤣

j_bertolotti, to random
@j_bertolotti@mathstodon.xyz avatar

#PhysicsFactlet
The human eyes have "only" 3 different colour receptors, so multiple spectra can be perceived as the same colour.
(And this without considering all the ways the signal is processed before you actually "see" it.)
#Optics #Colour #Color #Vision

On the left, the absorption spectra of the 3 human colour receptors, with a varying spectrum (shown as a black line) on top. On the right a disk coloured with the RGB equivalent of that spectrum.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@nish Today I learnt a new word! 😃

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

Released into the #PublicDomain and uploaded to #WikimediaCommons together with the #Mathematica script used to generate it: https://commons.wikimedia.org/wiki/File:ColorVSspectrum.webm

j_bertolotti, to DnD
@j_bertolotti@mathstodon.xyz avatar

What is destiny? Destiny is a DM that spent a lot of time preparing for the session and is not going to have any of your shenanigans.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@franco_vazza With a #DnD hashtag I assumed the context was clear 😉

oblomov, to random Italian
@oblomov@sociale.network avatar

Ma quanto sono inutili i timesheet?

Ora chiederò che venga inserito anche il tempo per compilare i timesheet nella rendicontazione.

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@oblomov Recursive timesheets! 😱

j_bertolotti, to random
@j_bertolotti@mathstodon.xyz avatar

Is there a list of news outlets that were once reputable and are now enshittified to the ground?
(Possibly including tech news websites.)

lisyarus, to random
@lisyarus@mastodon.gamedev.place avatar

I'm at this stupid stage of the project when I can't randomly prototype anymore kuz I have specific plans, but I don't have a solid foundation to work with yet, so I have to invent it on the way, and it's hard.

Still, I'm making progress. Here's some grass spreading mechanic :)

video/mp4

j_bertolotti,
@j_bertolotti@mathstodon.xyz avatar

@lisyarus Deadly spike traps springing below the feet of people? 🙃

j_bertolotti, to random
@j_bertolotti@mathstodon.xyz avatar

Trying to mass-delete old emails from gmail is like pulling teeth 😖
Now I remember why I postponed it for years.

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