WolfLink @ WolfLink @sh.itjust.works

Posts

0

Comments

752

Joined

1 yr. ago

I have these battery packs that magnetically stick to the back of my phone and charge it. Just slap it on and forget about it.

It makes my phone hot and wastes a lot of power (I can also charge from the same battery packs using a cable, and I get noticeably more charge).

But it’s real convenient when you don’t want to worry about it. I use them at conventions or when I’m out hiking or skiing.

I’ve had 8 joy cons drift. 6 of them I sent in to have Nintendo fix, the last pair I fixed myself with Hall effect sticks. I’ve also replaced some friends joycons with Hall effect sticks.

All potentiometer based controllers can drift eventually, the problem is the joycons are very thin and drift fairly quickly. Normally it takes years of heavy usage (think a competitive smash player jamming the thing back and forth) to become a problem. Joy cons fail under relatively average usage in a year or two, which is not normal.

Everyone assumes the Switch 2 joysticks are going to have the problem because they look almost exactly the same as the Switch 1 joysticks.

If the ISP doesn't provide V6 though it's time to switch ISPs.

cries in USA

I got a huge reduction in random login attempts when I changed my ssh port away from the default.

(Of course I also have actual security measures like log in by key only)

I went ahead and read the article. I know a bit about quantum computing. Here’s my summary of it:

Entanglement is a useful resource for quantum networking, enabling things like quantum-secure communication and distributed quantum computing.

TLDR The paper describes algorithms to more efficiently create a form of entanglement that’s useful from the error-prone “dirty” entanglement you get from entanglement-generating hardware.

When you make entanglement, it often doesn’t come out perfect, and you need a technique to “distill” “good” entangled states out of a collection of “dirty” entangled states.

The typical “rules” for this involve two parties that create dirty shared entanglement (shared entanglement means a pair of entangled qubits, but each party has one of the qubits). They can then do whatever they like with their qubits individually and can communicate (over classical channels e.g. the internet) but they can’t do anything “quantum” between the two of them.

This paper analyzes the case where there is a 3rd party that follows these same rules but has been previously set up as an “entanglement battery”, which means preparing it in a special state from which entanglement can be “borrowed” or “returned” to the battery using only local operations and classical communication.

In particular it’s looking for “reversible” (meaning no loss in total entanglement over the process) “entanglement manipulation” (changing the entanglement from one form into another, presumably more useful form). It goes into a lot of analysis as to what the limits on this process are, and makes analogies to how engines work in thermodynamics.

I think I have had an instructor put a mirror in the pool before lol

I doubt someone who has only ever read about swimming could do it in deep, cold water. But they are talking about taking it to a swimming pool to practice. I think they’ll be fine.

Probably. Take it to the shallow part of a pool (where you can stand up if you need to) and practice until you are comfortable trying more.

Also, watch some videos. I think it’s easier to learn something like swimming by watching others than by reading about it.

The extra $20 is for taking the test again with the answer sheet next to you

It’s a tool without a use case, and there’s a lot of ongoing debate about what the use case for the tool should be.

It’s completely valid to want the tool to just be a tool and “nothing more”.

When done well it greatly expands the game’s replayability.

When done poorly it feels bland and boring.

You should have to fill it in by climbing a big tower

I live in a bigger US city that does have a metro. It’s not bad for doing longer trips in certain directions, when it’s working. But it breaks down at least a few times a year, and if you have to make a transfer to another train to make it to your destination, it’s often literally faster to walk.

Considering each chair is built for that specific member, I think you have to take each chair owner’s anatomy into account.

Coffee

I spent a few $1000 on the computer, I’ll spend $100 more to make it look fancy

Private servers are not always a viable alternative option for players as the protections we put in place to secure players’ data, remove illegal content, and combat unsafe community content would not exist and would leave rights holders liable.

Then it sounds like the legislation enforcing leaving private servers on the table should also move the liability to whoever is hosting the servers. I’d be surprised if it doesn’t work that way already tbh.

But can electromagnetism at all emerge if the quantum mechanics dont exist to emerge things like magnetism and some of the behavior of electrons?

Short answer: yes.

Technically the world can’t exist without all of its physics. But that’s kinda backwards from how you study it. Quantum mechanics isn’t “more correct” than classical mechanics, it’s more that it’s “more detailed”.

If you want to model an electromagnet, an electronic circuit, light (in most macroscopic situations), how permanent magnets interact, electrostatic situations like how static electricity makes your hair stand up, lightning, the magnetic fields of celestial bodies like the Earth and Sun (they are big electromagnets), etc. you will use “classical” electromagnetism (meaning Newton’s mechanics, possibly with Einstein’s modifications, and Maxwell’s equations).

If you want to model material science situations, like determining what material to make a diode or transistor out of, or if a given material can become a permanent magnet, you will likely need quantum mechanics to help model the interactions of electrons on the atomic scale. The section on Wikipedia you were looking at is about this kind of material science. You do this by combining the same “classical electromagnetic” equations with Schrödinger’s equations for quantum mechanics.

diamagnetism, paramagnetism and ferromagnetism can be fully explained only using quantum theory

The magnetic properties of certain materials (e.g. why an unmagnetized piece of iron sticks to a magnet of either polarization), the way permanent magnets work, is best explained by quantum mechanics.

However, the electromagnetic force itself doesn’t “arise” from quantum mechanics, and you can explain things like electromagnets and a lot of common electric circuits (until you need a transistor) quite well without considering quantum mechanics.

Usually you take the “classical” formula for a force and to inform your quantum mechanical model of particles, and that’s how you can arrive at things like deriving how permanent magnets work with the help of w quantum mechanics.

Generally, a lot of material science and chemistry is inherently quantum mechanical because the way atomic orbitals and molecular bonds work is heavily quantum mechanical.