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Joined 2 years ago
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Cake day: August 3rd, 2023

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  • Drones work now because they are $1000 (random number in the right range), while a patriot missile is $4 billion dollars each. Sure you could shoot a drone down with one, but if you do the enemy will just send more and bankrupt you.

    I agree with the point but these numbers are some orders of magnitude off. A patriot missile is typically 4 million dollars (so not billion). Drones vary widely depending on the type. Man-portable scouting drones can go as low as a few hundred dollars. I don’t think a patriot missile would ever target something that small flying that low though. The Iranian Shahed is estimated to cost around $30-50k. Russia produces its own upgraded version (better navigation systems, bigger warheads, etc.) that costs around $80k.

    Even then, you can make 50 drones for the cost of a single patriot. The economics are not favourable.





  • Another big factor is that every plant is effectively a completely custom design. Because of how few nuclear plants are constructed, every new one tends to incorporate technological advancements to enhance safety or efficiency. The design also has to be adapted to the local climate and land layout. This makes every single plant effectively one of a kind.

    It also tends to be built by different contractors, involving different vendors and electric utilities every time. Other countries have done better here (e.g. China and France) mostly due to comprehensive government planning: plopping down lots of reactors of the same design, done by the same engineers. Although these countries are not fully escaping cost increases either.

    You are completely correct that regulation is also a big factor. Quality assurance and documentation requirements are enormously onerous. This article does a pretty decent job explaining the difficulties.



  • A system I work with gives all keys a string value of “Not_set” when the key is intended to be unset. The team decided to put this in because of a connection with a different, legacy system, whose developers (somehow) could not distinguish between a key being missing or being present but with a null value. So now every team that integrates with this system has to deal with these unset values.

    Of course, it’s up to individual developers to never forget to set a key to “Not_Set”. Also, they forgot to standardise capitalisation and such so there are all sorts of variations “NOT_SET”, “Not_set”, “NotSet”, etc. floating around the API responses. Also null is still a possible value you need to handle as well, though what it means is context dependent (usually it means someone fucked up).


  • VAT is a universal tax on goods. A tariff is basically a tax that applies only to imported goods. So a tariff distorts the market, making imports from a region more expensive relative to other regions, or domestic goods.

    Note that basically any tax is bad from an economic perspective. However for the government to function revenues must be raised. It is considered better for market efficiency to raise revenues in such a way as to least distort the market. Tariffs are a very distorting instrument, VAT is generally considered less distorting because it affects all parts of the market equally.


  • No magnetic confinement fusion reactor in existence has ever generated a positive output. The current record belongs to JET, with a Q factor of 0.67. This record was set in 1997.

    The biggest reason we haven’t had a record break for a long time is money. The most favourable reaction for fusion is generally a D-T (Deuterium-Tritium) reaction. However, Tritium is incredibly expensive. So, most reactors run the much cheaper D-D reaction, which generates lower output. This is okay because current research reactors are mostly doing research on specific components of an eventual commercial reactor, and are not aiming for highest possible power output.

    The main purpose of WEST is to do research on diverter components for ITER. ITER itself is expected to reach Q ≥ 10, but won’t have any energy harvesting components. The goal is to add that to its successor, DEMO.

    Inertial confinement fusion (using lasers) has produced higher records, but they generally exclude the energy used to produce the laser from the calculation. NIF has generated 3.15MJ of fusion output by delivering 2.05MJ of energy to it with a laser, nominally a Q = 1.54. however, creating the laser that delivered the power took about 300MJ.




  • Are we painting Stalin as a good guy here? He only fought Germany because they tried to invade. Before that he repeatedly made attempts to court Nazi Germany. He signed a nonaggression pact, made an agreement to secretly divide Eastern Europe together, and continued trading. Stalin didn’t really give a shit about the fascism part, he only cared once his own territory and sphere of influence were threatened. Same as all the other major allies, btw. Everyone tried appeasement first, nobody really cared about the fascism.

    “Saving Europe from Hitler” paints it as a selfless act of heroism when really everyone was mostly concerned with maintaining their own power.




  • I advise everyone to ignore this article and read the actual paper instead.

    The gist of it is, they gave the LLM instructions to achieve a certain goal, then let it do tasks that incidentally involved “company communications” that revealed the fake company’s goals were no longer the same as the LLM’s original goal. LLMs then tried various things to still accomplish the original goal.

    Basically the thing will try very hard to do what you told it to in the system prompt. Especially when that prompt includes nudges like “nothing else matters.” This kinda makes sense because following the system prompt is what they were trained to do.


  • sushibowl@feddit.nltomemes@lemmy.worldLayaway
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    4 months ago

    Here’s the thing, though. There’s no interest charged to the customer. I think Klarna makes its money just because companies pay them money for integrations and for the ability to advertise that customers can buy now pay later and such. And at least in the case of my company’s integration with Klarna, Klarna takes all the risk. They’re lending customers money and hoping the customers pay it back. My employer gets the money up front and isn’t out any money if the customer doesn’t pay.

    Your company pays a transaction fee just like with a credit card. Except it’s usually roughly twice as expensive as a credit card. This is what allows Klarna to take on all that risk, generally. For your company this is essentially a marketing expense. Offer a convenient way to pay in return for a few percent of the transaction (3-6% + a fixed fee, $0.30 perhaps).

    Klarna generally partners with some financial firm to finance these short term loans, and they use the merchant fee to pay interest. These can be as high as 25% APR. It’s a high risk loan.


  • sushibowl@feddit.nltomemes@lemmy.worldLayaway
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    4 months ago

    This is how they make money. It’s the only way they make money.

    That is not correct. Klarna is functionally a payment processor, like an advanced type of credit card, and charges the merchant fees per transaction. For example, see here. They are highly cagey about specific fees until you actually sign up, and it depends on region and business size. But interchange fees are where the majority of their revenue comes from. To my knowledge, the fees are typically 3 percentage points above what the merchant would pay for a credit card transaction.

    The reason merchants still accept Klarna despite the high fees is of course, improved conversion rates and decreased risk. Klarna assumes all the risk of the customer not paying, the shop gets all of the money instantly and doesn’t have to worry about it for the most part. That mainly makes it attractive for high margin shops that don’t mind spending lots on marketing to get a few extra sales (fashion, perfume, high end electronics).

    I’m not too knowledgeable on how Klarna deals with late fees, but I’m pretty sure it differs per country they operate in. Many places have regulations limiting the abuse of late fees. I wouldn’t be surprised if the US is not that kind of place, and people who are late get fucked with fees.

    In general, I agree with the second part of your comment and I do not recommend using any buy-now-pay-later kind of scheme, because you’re taking on additional risk for no real reason. Lots of stuff can happen even through no fault of your own (check engine light? Job downsizing?) that will affect your expected future income.