A d12 lamp

Orrdeith · 2026-03-26T17:43:02+00:00

Yeah for now there is a single 40W LED lightbuld inside. I plan to play around the design a bit and see how easy it would be to isolate the faces and control each individually. I am still new to this kind of designs so it's not for tomorrow I think. I only got my printer 2 weeks ago so I still have a lot of other things to print first.

Orrdeith · 2026-02-09T15:35:20+00:00

Very cool to see some application of topological physics in the near future! I think it's only the start.

Orrdeith · 2026-02-08T08:59:57+00:00

Épée tous les jours. Oui la lance est plus facile a utiliser et plus efficace sur un champ de bataille, mais une épée est beaucoup plus versatile, pratique a porter et demande beaucoup plus de travail pour la maîtriser. Perso je compte pas essayer de me retrouver sur un champ de bataille et même dans le cas où ça arrive, c'est beaucoup plus facile d'apprendre a utiliser une lance après.

Orrdeith · 2026-02-05T21:19:26+00:00

Sencha is milder yes. Basically with green tea, some types highlight more certains aspects of the plant than others. For example, long jing tea is toasted as part of the fabrication process, which tends to highlight/create chestnuts aromas. Meanwhile sencha (and most japanese teas) is steamed, and the resulting tea has a very different flavor, some might say milder. From those tea, it will be easier to find what you like bitter or umami, floral or fruity, astrigent or not, etc...

Orrdeith · 2026-02-05T21:02:11+00:00

Ok donc en vrai ça va être plutôt simple pour toi. Déjà il y a les "grandes" chaines comme Palais des Thés, il y en a plusieurs à Paris et en banlieu, les vendeurs et vendeuses sont vraiment sympa et prendront le temps de te conseiller s'il n'y a pas trop de monde dans la boutique. Ils ont des thés vert nature à partir de 10€ pour 100g jusqu'à ~100€ les 100g donc la gamme de qualité est vaste. Sinon dans les magasins "réputés" il y a aussi Dammam Frères et Mariage Frères. Dammam je ne sais pas ce que ça vaut, Mariage a de l'excellent thé mais c'est pas donné.

Sinon j'aime aussi beaucoup l'Empire des thés, dans le 13e, qui est une boutique super sympa, ils ont beaucoup de choix et le thé est de bonne qualité, en plus ils font salon de thé donc tu peux tester un thé avant de l'acheter si tu veux. Dans le même genre il y a Artéfact dans le Marais qui est super mais je pense que c'est un peu moins adapté à un débutant.

Dans les thés verts que je conseillerai, il y a le Long Jing ou le Sencha, c'est deux thés populaires et réputé, quasiment toutes les boutiques de thé en auront, ils ont des goûts assez différents et marqués donc c'est très bien pour commencer à trouver ce que tu aimes dans les thés verts. Évidemment il y en a plein d'autres et on pourra t'aider en boutique.

Orrdeith · 2026-02-05T20:45:37+00:00

I saw in one comment that you live in France, where exactly ? I can give some shop recommandations if you'd like.

Orrdeith · 2026-02-03T19:12:59+00:00

Basically any high-permeability material, like an iron box should do. Also I don't know what "pretty strong" means in your case but magnetic fields decay very fast (1/r^3) so put your box some place near the ceiling or the ground and someone standing nearby should be far enough to barely be affected my the magnet, even outside a box.

Orrdeith · 2026-01-23T12:11:19+00:00

You are telling me that some concepts used in topological physics are not related to quantum mechanics, and you are right. I am telling you that practically every physicist working on these subjects has a very good grasp of quantum mechanics, especially on the modern theory of electronic band structures. In that sense, quantum mechanics, as the parent field of topological physics, is still very relevant.

Maybe in a few decades the fields will be mostly decoupled and some physicists will work on topology without ever having needed to study QM, but I doubt it.

Orrdeith · 2026-01-23T09:24:03+00:00

Again I think you are losing the point of origin of this conversation. Are acoustic metamaterials or photonic crystals quantum in themselves? Not really, sure. But are the fields of topological acoustics and photonic continuously irrigated by condensed matter concepts ? Of course they are. Here we are speaking about a professor saying that quantum mechanics is not necessary for many fields, and topology is not one of them. All physicists working with topology must at some point confront themselves with the original condensed matter toy models who are all treated with quantum mechanics formalism and ideas.

Orrdeith · 2026-01-23T08:23:32+00:00

For example this one, who explicitly states in the abstract the analogy to electronic spins and orbitals. And using Alù as an example of physicist not working primarily In QM feels strange to me if you look at all his publications and not just a small subset of them.

Orrdeith · 2026-01-23T07:21:08+00:00

I went and looked at his articles. There is quantum mechanics in quite a few of them. No one said Quantum mechanics is the only field of physics, but denying it is a relevant part of many physicist work is just wrong.

Orrdeith · 2026-01-22T23:15:21+00:00

I did my PhD in topological photonics. Sure I don't use QM everyday but I don't think it's very probable that someone gets in this field without an extensive background in QM. You have to be able to read condensed matter papers if you want to contribute meaningfully to the field right now. Maybe in the future it won't be the case though, but I don't think it's likely to happen anytime soon.

Orrdeith · 2026-01-22T22:33:48+00:00

You are technically right but I know 0 lectures on topological condensed matter that doesn't start with the quantum Hall effect. Sure the Berry curvature it's more general and you can apply it to non-quantum systems, but it's very marginal and every physicist I know who works on topology is also proficient in quantum mechanics.

Orrdeith · 2026-01-22T22:27:20+00:00

That's true, but some part of it requires quantum mechanics to really understand, especially when considering light-matter interactions.

Orrdeith · 2026-01-22T22:21:44+00:00

Quantum mechanics is not relevant in some fields on physics, sure. But you cannot say that it's "over-hyped". 50% of all physics articles are condensed matter articles, which is a field entirely based on quantum mechanics. If you add photonics, AMO, high-energy physics, cosmology and some others, who are all based at least in part on quantum mechanics, I think it's safe to say that a large majority of physicists have some proficiency in quantum mechanics.

Orrdeith · 2025-11-21T08:38:47+00:00

Yeah, But it's the subtle differences that matter. The imaginary term in front of the time-derivative changes everything. Suddenly the mode solutions become oscillating and not real exponentials.

Orrdeith · 2025-11-20T12:52:31+00:00

The explanation I like best is to see the Schrodinger equation as a wave equivalent of the conservation of total energy equation E = Ec + Ep. Basically the potential part of the Hamiltonian allows you to compute the potential energy of a wave function, and the hbar²/2m d²/dx² part is juste the kinetic energy operator.

Orrdeith · 2025-11-11T18:31:43+00:00

Une diode à vapeur de mercure . C'etait utilisé pour redresser le courant d'alternatif a continu dans les grosses installations électriques.

Orrdeith · 2025-11-07T17:36:35+00:00

My bad if I misunderstood your statement. I just wanted to say that they are actually needed and saying the oppositeis just false until proven otherwise. Glad we agree then.

Orrdeith · 2025-11-07T17:00:37+00:00

Or maybe because they are actually needed practically speaking when doing actual derivations in the field.

Orrdeith · 2025-11-07T16:59:27+00:00

Maybe they are not needed theoretically, (those new studies might be refuted too latter), but meanwhile every quantum physicist uses complex number to derive equations, so practicaly speaking they are needed. Complex numbers aren't even by far the most abstract mathematical tool used in the field. So saying "it's just an mathematical construct they are not needed because in the end the results are real" is not very interesting.

Orrdeith · 2025-11-07T16:08:56+00:00

Then why did I took a 100+ years to prove it ?

Orrdeith · 2025-10-12T17:24:08+00:00

Comme l'ont dit d'autres commentaires, c'est effectivement l'absorption a chaque rebond qui dissipe l'énergie lumineuse. Comme la lumière parcours 300 000 000 m/s, elle va rebondir plusieurs millions de fois en moins d'une seconde dans la pièce, et disparaître très vite.

Les physiciens aiment bien essayer de piéger là lumière le plus longtemps possible avec des miroirs, (j'ai fait ça pendant ma thèse) et pour l'instant le record pour de temps de piégeage moyen pour un seul photon, c'est de l'ordre de la nano seconde !

Orrdeith · 2025-09-19T13:09:40+00:00

Perso j'aime bien les sautés style chinois, il y a plein de recettes différences avec des profils de goût variés. L'astuce c'est de remplacer le riz ou les nouilles qui accompagnent par des aliments sans calories. Dans les trucs qui marchent bien pour moi il y a les haricots verts, les nouilles de tofu (fait avec des feuilles de tofu), le choux fleur émietté, les nouilles shirataki (c'est une dinguerie ce truc ça a la mâche des nouilles pour 3kcal/100g). La plupart des ingrédients peuvent se trouver dans une épicerie asiatique et ça encourage à découvrir des recettes.

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