hwillis

design for manufacturing is a part of engineering

That's the efficiency of the device, not the laser. This device does not include a laser.

That said, I don't know of any diode lasers that are that bad. Lasers for this fiber are probably 50%+ efficient and even the high frequency laser diodes are still 30%+

top comment, just keep scrolling down farther: https://www.zhihu.com/question/637763289

Simple answer: no. Ferromagnetic hysteresis increases with temperature, and the hysteresis here is stronger at lower temperatures. The amount of hysteresis they see at low temperatures is also too much to explain with undetected contamination. Plus, the scientists posted a picture of them fully floating a sample upside-down, which is pretty hard to explain away.

Complex answer: Maybe. Copper sulfide does a lot of weird things, and it's very easy to screw with ferromagnetism in unexpected ways. It's totally possible there's a lot of iron in this sample, and the huge incentive for room temperature superconductors is a powerful temptation to slant your data... or fabricate it entirely: https://www.science.org/content/article/plagiarism-allegatio...

That's my alma mater :(

> You only need to learn the solver once, and you can re-use it for all kinds of problems. (Assuming that your instances don't have to be solved with low latency.

Mostly I run into this issue trying to script/hack together something quickly in a language I don't use very often. Ie usually missing a clean environment, working builds, nice package control. Like I want to do something in lua for a plugin, or python for some blender thing, etc etc.

It's just one more hassle that makes the whole thing frustratingly not worth it. That toolbox is a neat link though, thanks!

> Hierarchical graphs: city-level, inter-room in building, intra-room.

Handmade? It's always annoying to me when you have a small NP-hard problem (graph partitioning is definitely a recurring one for me) and you want to just throw some box algorithm at it without having to shop around for a library that you have to learn.

I remember there was a while in college where I didn't understand why A* in an RTS would be such a hard thing... and then I watched a video or read something that pointed out that if you don't want units walking through each other then every single moving thing is constantly re-pathing around every other unit. New respect for command and conquer.

The biggest trip-up is the pronunciation of "prototypically", and you had "typically" in your original. Maybe it's overfitting to a stilted proto-typically? Could try with a different, less similar sentence

You can see the FDA tests here:

https://www.fda.gov/drugs/science-and-research-drugs/drug-qu...

It's not something they do for very many drugs or very often.

If there were any market incentive whatsoever for that, it would already exist. The FDA does not have magical anticompetitive powers that make people care less. We have private and public postal services and railroads operating alongside each other.

The best case scenario is that there is enough market will to allow a lab to monopolize the market, leaving you with the same problems as today but with even less standing in the way of fraud, like companies just paying for good reviews. The realistic case is that no such testing would happen, just like it was before the FDA.

Much more likely they had a strict time limit (internally or externally imposed) on what they considered biodegradable. If you make it stronger but thinner, bacteria can break it up much faster which leads to faster breakdown. By comparison the bag being loud seems pretty irrelevant if it's just not possible to make a thicker bag degrade faster.

Also, many biodegradable plastics are more brittle than more common plastics. They only way to keep the bag flexible in that case is to make it thinner.

In that time, global EV sales have increased by over 450%: https://www.iea.org/energy-system/transport/electric-vehicle...

The prevailing opinion was that lithium would stay expensive or go up even more. The price also has not stabilized and may well continue to drop; this is an in-progress update.

It's not unsprung. The wheel and gear bit are the only unsprung parts; think of it like the motor attaching directly to the wheel bearing, and the wheel is able to move vertically on the bearing.

I think this only works with RWD, because the turning wheels can't be sprung without also having to rotate the springs.

It would be a better suspension (closer to racing suspensions) than standard, because wheels wouldnt toe in/out when they moved down/up. Looks expensive as hell though

> I think what happens is companies will get better at understanding who is and who isn't spending time working (I am careful not to use word "productive").

It's not clear to me that there's much of an incentive for this, and I think it requires more effort on the part of decision-makers than sending an email telling everyone to come back to the office.

Direct oversight has always been a very minor part of performance metrics, compared to word-of-mouth or deliverables. WFH still has those two factors, all it's missing is the direct oversight. I can only see manager support for this at places where managers are regularly checking over your shoulder, which is already crazy.

Misleading way of looking at it. Lithium and sodium are not the major cost (or weight, or volume) inputs to making batteries, and crustal occurrence is very distantly related to cost. We mine things from places with 100x-1mx higher concentrations than natural. Water concentrates lithium into brines and clays for us. Sodium's low density causes it to create massive domes underground that are extremely recoverable. In contrast many metals aren't naturally concentrated.

Lithium batteries aren't made of lithium. They're made of nickel- or iron, or manganese, or cobalt. In iron and manganese batteries the #1 price factor is the manufacturing- the energy, solvents, and machinery used to deposit materials onto film.

Likewise sodium batteries are not made of sodium. There's 13x more iron in them than sodium. There may also be large amounts of manganese or vanadium. The cost of manufacturing is also higher per kWh.

It's a face transplant, not surgery to make someone else's face look like his. Of course it doesn't look natural.

Natural isn't good. Rotationplasty is way, way better than any of the alternatives (amputation, transderal prosthesis etc). It involves reattaching the foot to the knee backwards so that the ankle acts like a new knee.

https://walkwithoutpain.com.au/wp-content/uploads/2016/05/ba...

You walk almost naturally and keep more strength than any electronic prosthesis. It's has less pain than an amputation and no phantom limb sensation. It may look primitive, but it's far and away superior to anything else right now.

It has been 6 months. This is a CNS nerve, so you'd usually expect to see something in 3-6 months. CNS nerves are much less likely to heal, and it was 3 months between the eye being removed and the transplant.

IMO it seems unlikely that there will be any restoration of vision, but having an eye at all is an absolutely incredible accomplishment surgically. All those tiny things being attached inside the skull is just amazing.

It's not the standard of care, a doctor said it SHOULD be standard of care. Transplants for nonvital organs are very rare. It has been possible to transplant things like arms and legs for a long time- see Guðmundur Felix Grétarsson, who is able to feel things in his arms now and use them for light tasks.

https://en.wikipedia.org/wiki/Gu%C3%B0mundur_Felix_Gr%C3%A9t...

But maybe 100 people total have transplanted arms. They are rare because insurance doesn't cover them; medically they're considered investigational. Growing nerves back is still a complete crapshoot, and you'll certainly never get back normal function.

That's a pretty significant issue, because even arm transplants compromise your life in new and terrible ways. You're required to take prednisone, ciclosporin etc for the rest of your life. You trade off one crippling disability for another- a massively compromised immune system. Potentially that can kill you, if you get sick and are unlucky.

You can open a door and use a broom with a hook. You get very little quality of life from feeling tingles in your elbow. Is that worth risking your life and taking expensive steroids every day which can drastically change the way you think and feel? Probably not.

Is it worth it to be able to hold hands with your wife? To be able to feel the heat of a coffee mug? To not need help putting your arms on? Medical literature does not typically value those things. Objectively they're small, momentary inconveniences. Many, many people are happy without them. They might mean the world to others.

In cases like the OP it's cut and dry, IMO. Look at him (image fairly disturbing): https://static.scientificamerican.com/sciam/assets/Image/202...

That tissue on his face, even after 50+ surgeries, is agonizing. There just isn't enough skin and what's left is fragile. Cuts and blisters get pulled open and don't want to heal. Every movement sucks. That person would not mind wearing someone elses face; they aren't wearing their own face any more. It's completely unsurprising that their quality of life is improved, even with all the immunosupressants.

> “The donor hero was a young man in his 30s who came from a family that strongly supports organ donation. He, in support by his family, generously donated tissues leading to this successful face and eye transplant, but also saved three other individuals between the ages of 20 and 70, donating his kidneys, liver, and pancreas,” said Leonard Achan, RN, MA, ANP, president and CEO of LiveOnNY.

https://nyulangone.org/news/nyu-langone-health-performs-worl...

> There's no need for the CCP to tell TikTok to politically polarize the content they show to people.

That's exactly what the parent was saying.

> China's benefit to encourage moves in both directions

It's disingenuous to suggest that people are talking about tiktok because they think it's just an inherently divisive app. If people want to ban apps that polarize people, twitter would certainly be higher on the list.

> Does China control TikTok? Yes.

No. Not in any meaningful way. The data and employees are in the US. Every intelligence agency in the US is watching those buildings and reading their data. The US has no laws against inspecting every single packet sent internationally, the employees are subject to US laws, and tiktok has distanced itself from china.

https://www.cnn.com/2020/07/07/tech/tiktok-leaving-hong-kong...

They are not meaningfully different from any other US company. It's not like they don't give data to china:

https://www.businessinsider.com/google-gave-user-data-to-hon...

Tiktok is just the new banana republic, the new gulf war, etc. The US government is aggressively anti-competitive with non-domestic corporate threats to its largest industries. It has always attempted to destroy competition and maximize domestic control of furs, then produce, then oil, and now social media and advertising.

That's absolutely evidence of the opposite. If china thought they could use the app's algorithms to promote national unity, they would do that. They have their own exclusive app.

China thinks its effective at wasting time. Children also aren't allowed to play video games monday through friday, and are limited to 1 hour per day otherwise- a law which existed before douyin limits: https://www.bbc.co.uk/news/technology-58384457

The country that is obsessive about its children and their productivity, the country famous for kids competing in chess and abacus and piano... that country is just banning douyin because it's a time waster.

?? Fines are not the price a government is willing to sell something for. They are a mechanism of enforcement when it's otherwise not realistic or possible to enforce rules. You levy fines when you can't just arrest people or similar, not because you're okay with the behavior.

All you're saying is that we should tax things we don't like, which... duh. We do that- see alcohol, cigarettes, etc. Actual taxes work way better than fines, since they take into account the revenue involved instead of just being an arbitrary number. But an obvious consequence is that you aren't actually banning the thing, and in the case of a digital product like tiktok you're not even discouraging it.

If you levied a recurring fine on tiktok in return for allowing them to do what they want, you're actively encouraging them to collect and sell as much data as they possibly can, to recoup the fixed cost of doing business with you.

that doesn't sound very subsonic

> Ah, there's the rub.

It'll have a range of ~90 miles. Since motorcycles all have pretty similar weight and aerodynamics (specifically: very bad), you can compare different models with the same power pretty reasonably.

The efficiency of the battery, electronics, and motor are all >>80%. If they were lower, they'd be on fire. The difference between 80% and 90% efficient is only 12.5% extra power to the wheels. The actual energy lost is all in the drag and the speed you ride- even the weight doesn't matter much because the tires don't deform nearly as much as car tires, while the air drag is actually about the same as a sedan.

For comparison a gas motorcycle will get 150-200 miles on a tank, but even that is very very dependent on how you're riding.

> Not sure how heavy a electric motorcycles battery would be, possibly 100 lbs? That's a lot harder. 50 lbs would be a one person job for a wide range of consumers.

A 6.4 kWh (80-100 miles) battery like the one in the OP is ~60 lbs at the lightest. A larger battery like the 17.3 kWh (160-180 miles) one in a high-end Zero weighs 160+ lbs.

When I was in middle school and daydreamed about sci fi futures and robot wars, I wondered about a giant steel bow as a robotic sniper's weapon.

A 4' tungsten needle at high subsonic speed would be a scary thing. Maximum range of 5+ km, almost silent, and able to punch through meters of concrete. It's not quite an anti-tank weapon, but if it hit a car or a person it would just leave a hole and a thump. It'd go right through an engine block and bury itself into the ground so deeply that the hole would fill itself back.

I've also seen what a modern broadhead can do to a moose. Warning: this video is horrible.

https://youtu.be/3VhEYvHdVa0?si=vsK_aWdSxJ3ylYpU&t=70

That arrow goes right through the ribcage and shreds a lung. The animal coughs up a pint of blood immediately. In less than a minute it passes out from blood loss.

All to say... maybe we wouldn't kill people on the scale of a nuclear bomb. But if humans really tried to go to war with arrows, it would be awful. Guns are better at killing than they ever have been, but bows have also gotten better.

The most common GPU on steam stats is a 3060. The AMD 7800/7700 do 90% and 70% better on benchmarks. So if you have either of those, you're getting nearly twice the FPS that the most common steam user would see.

I mean, you shouldn't be charitable. Those clothes drying aren't 20 subdivision wide because they're detailed. The logs have five sides they don't have all those segments along their length because they're detailed. At absolute best, they didn't go back and fix the topology. At worst those were development assets that were thrown together in 5 minutes and then never replaced.

banking does sometimes require actual money still, much more so if you're poorer. What's another institution that has offices everywhere, ships things every day, and privately and securely stores things for huge numbers of customers? Remember, DMVs/RMVs are state-level.

Hell, they're even surprisingly used to keeping large amounts of valuable paper safe. It wasn't that long ago that you could make a lot of money stealing stamp sheets.

1. They're talking about all energy (cars, heat, and electricity), not just electricity.

2. Demand is up in this scenario, not supply, because of all the things being electrified.