Recent comments in /f/explainlikeimfive

Flair_Helper t1_j23kugj wrote

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professorjaytee t1_j23k39q wrote

I used to drive an electric forklift; we had two at a warehouse where I worked. Under typical heavy use we'd need to swap out the batteries in each forklift every two hours or so. That said, it was one heavy MF of a battery. Better to have two people changing one together, although I could do it by myself.

Not sure how practical that would be for a heavier vehicle, with a typically longer desired battery life (range) and consequently (in total) much heavier batteries.

Charging each forklift battery took eight hours or more, so we couldn't wait for them. Swapping one only took five minutes. We had to keep a number of spare batteries constantly charging on an array of rechargers just to keep both our vehicles constantly working all day long (ten hours). We had five for each. Yep... we had ten rechargers and twelve batteries total for our two forklifts.

Sure, we could have used four smaller batteries instead of one, but then we'd need four rechargers in place of each one. That would've been forty chargers required. If smaller units sped up the charging time by a factor of four, then we'd still need the original ten chargers each.

How that would play out with tens of thousands of cars, and even more thousands of battery units constantly sitting in more thousands of rechargers...? Not well, I think.

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truckedoff t1_j23g2ti wrote

Divorce is expensive as for complications that will depend on the people contesting it if you can agree on everything and simply want a divorce makes it a lot cheaper and easier but if your arguing over everything then it will drag on and the solicitors are the ultimate winners..... I've been divorced once and separated over 13 years from the present wife.

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I_bims_der_Jens t1_j23eoyu wrote

So a video game is just a collection of files which can be copied at will to any computer. An important subset of this files contain executable code, a program. Now in principle any computer could run the same code, but the publishers of video games want to restrict the users of their product to those who paid for it.

One way to do this using physical media, e.g. DVDs, is done by removing important pieces of the code (or encrypting it) which is stored in a normal fashion on the DVD. Then at startup of the game, in order to continue it requires these pieces (or a key for decryption) and reads them from parts of the DVD which is hard to copy exactly, so people can not just create and distribute copies of the DVD. This works because end-user DVD burning equipment has much higher read-fidelity than write-fidelity. A skilled cracker could analyze this process at the program's startup and just patch the missing pieces directly into the program and upload it.

A much better and modern approach is DRM like Denuvo. Obviously the companies who make DRM are quite secretive about its working so we have to rely on the crackers who try to circumvent the protection. It usually works by online-activating the program of the game and fingerprinting it to the end-users environment and hardware. So every user then has a slightly different program installed which at startup or even while playing tries to make sure it is run at the very same computer on which it was activated. A cracker must try to analyze the program, which had a lot of senseless data added (obfuscation) in order to prevent being analyzed. They then have to find all functionality in the program which prevents execution on the wrong user hardware and remove that parts of the program. Finally they can upload a program which runs on any user's hardware without online-activation.

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Sigurdeus t1_j23chdw wrote

I'll add to this, too: my flow has generally been on the lighter side, cramps has been mild and my two pregnancies were quite easy (started easily, there was nausea but no throwing up, I was really tired but generally not too bad). Childbirths were relatively easy and quick, too (still the most brutal and painful thing I've been through, but, relatively).

I wonder if anyone has done any reasearch of this matter. It'd be interesting.

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crookedriverguy t1_j23bzi2 wrote

Well, you're overlooking a concept here that *might* work:
Car maker Nio offers battery swaps for customers with a "battery as a service" deal. A swap at designated stations are claimed to take 5 minutes

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explainlikeimfive-ModTeam t1_j23bofc wrote

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explainlikeimfive-ModTeam t1_j23bnql wrote

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ForceOfAHorse t1_j23b7cp wrote

The most important part of this conscious choice is that... Nobody wants that. Most use cases for cars these days are short trip to work-store-home. Nobody needs to swap batteries. People just charge at their destinations.

There are few problems with electric cars that can be solved with upgrading infrastructure, but battery swapping stations are definitely not one of those.

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bremidon t1_j2378i2 wrote

You need to actually take a deeper look before being quite so confident.

You are semi-correct though: it *is* a conscious choice. You are just completely wrong on the reasons.

Here are the real reasons:

  • We do not have enough batteries. We need every single battery we can make to be in a car, not sitting around somewhere doing nothing.
  • Swapping stations are bulky and expensive. It is *much* more efficient and effective to use the same amount of space and money to make chargers than swapping stations. We are not talking 10 or 20% better, but more like 10 to 20 times better.
  • Your "5 minutes" only works if you compare a single car charging to a single car swapping. Because you cannot have so many swapping stations, you are going to end up with queues, and that will drastically change things up. Even just a 4 car queue is going to put charging and swapping on fairly level ground.
  • There are legal issues surrounding the batteries. If you bought them, then what happens when you get new ones swapped in? What if you deliberately swapped out defective batteries just to get better ones? If you don't own them, how does that work? Who is responsible for the batteries currently in your car?

I want to make clear that none of these things are unsolvable, but they *are* major headwinds. We are having trouble building out just a charger network; waiting for a swapping network would delay things by at least 10 years or more.

Only the first one is guaranteed to be solved, more or less on its own. In 5-10 years we can strike it from the list. The last one is probably the next easiest, but I expect it will take at least 10 years for all the legal difficulties to wind their way through courts.

The middle two are tough, though. As charging times keep coming down and the ability to charge at home keeps increasing, the use case for swapping gets smaller and smaller. Perhaps it will end up being a thing in some bigger cities, but it will probably never be the standard.

Bonus Reason: Because of all of the previous reasons, it is less expensive (and makes the car lighter and safer) to make the batteries part of the structure. So unless someone can quickly solve all those earlier points, the carmakers are going to all gravitate towards swapping being physically impossible. This reduces the use case for creating a swapping system and the whole idea simply collapses in on itself.

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tminus7700 t1_j236y0c wrote

> It's a powder form of purified uranium

It is not purified uranium. It is uranium oxide. Before being reduced to the metal.

https://en.wikipedia.org/wiki/Yellowcake

>Yellowcake (also called urania) is a type of uranium concentrate powder obtained from leach solutions, in an intermediate step in the processing of uranium ores. It is a step in the processing of uranium after it has been mined but before fuel fabrication or uranium enrichment.

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