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Cake day: June 15th, 2023

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  • Strong disagree. I ran non-ECC memory on my server and services would unexpectedly crash maybe once per week. Over the span of a year I had two databases get corrupted that cost me a lot of time to fix. I tried swapping sticks but it happened with all of them. I switched to ECC memory and the problems disappeared. I needed more memory anyway and the price delta for ECC was about $100. I didn’t have to swap CPUs or anything, AMD desktop CPUs and chipsets support it out of the box. ECC memory is absolutely worth it.


  • Not that I know of, at least not for our cubesat. The aerospace sector moves extremely slowly because of ‘flight heritage’ - basically, if it hasn’t been in multiple long-term space missions before then it’s an instant rejection. You might ask ‘then how does any new tech get into space?’ and the answer to that is ‘it generally doesn’t’. More amateur satellite developers like university programs tend to ‘move fast and break things’ but with an emphasis on ‘break’.

    Besides this suborbital flight I haven’t heard of anyone using carbon fibre frames before. I’m not a chemical engineer but I would imagine CF composites may have issues with outgassing, compared to metals. Outgassing can result in volatile compounds leaving suspension under a vacuum and depositing elsewhere, particularly bad for camera lenses and solar panels and such. Since the frame touches basically every part of the satellite, the risk here is high.


  • The original comment couldn’t understand why people were ‘raising their eyebrows’ at the price. I said because it’s basically a luxury item. Whether there are other alternatives that are even less value doesn’t factor into it. That’s the ‘door in the face’ fallacy.

    Regardless of whether a Rolls Royce is more or less ‘value’ than a Lamborghini there’s gonna be a whole bunch of people that are gonna look at that and say ‘why would you spend X times the money when it gets you from A to B just the same as a Toyota Corolla’. That’s the answer to the original question.




  • Sorry dude, I’m not paying $100 USD for a controller. The last controller I bought cost me ~$30 USD (GameSir T4 Kaleid) and has everything I need, including hall effect sticks. The steam controller having cool tech like touchpads and a gyro and whatever else is cool I guess, but I don’t need or want that. No amount of stuff like that is gonna make me spend that much on a controller.

    So yes, the steam controller price raised my eyebrows, in the same way that basically all first-party controllers do. They’re all crazily overpriced imo.



  • A solar flare is just one example of many possible causes. There are plenty of other ones. You didn’t touch on any of the others so let me explain - NASA reports on small satellite missions show that about 40% of satellites experience at least partial mission failure within their lifetime. Studies have shown the leading cause of satellite failure is propulsion systems, responsible for about half of all failures. This is not uncommon at all.

    Most altitude ranges in LEO still have debris from decades ago, the exception being below 300km, which is basically still in the atmosphere. Unfortunately, debris strikes have regularly produced debris that are flung into higher orbits, so even collisions between satellites in this range are dangerous.

    Edit: I also forgot to mention, the five day estimate (now three days actually) wasn’t for a close-call, it was for a debris-generating event.


  • Collisions aren’t theoretical, near misses are so common that there’s an entire department at NASA dedicated to detecting them and warning satellite owners to adjust course, I know because we were contacted about a possible collision involving our cubesat. Prior to megaconstellations being deployed if humanity stopped adjusting satellite orbits there would be a collision within a month, now there would be a collision within 5 days. It’s only a matter of time until both satellites on a collision course don’t have the ability to adjust course (engine failure or no propulsion/fuel/comms). In the event of a Carrington-style solar flare there’s a good chance a decent percentage of satellites would be knocked out, making this hypothetical into a reality. Further, we can only currently track objects down to about 10cm, but NASA estimates suggest about 500,000 objects exist between 1-10cm in size in LEO.


  • If there’s moisture in the filament it vaporises in the extruder, causing steam bubbles that expand and disrupt the laying down of plastic, usually causing inconsistent extrusion lines (which itself causes poor layer adhesion). Some of the filament may end up being heated in the extruder slightly longer than other bits depending on these steam bubbles, which can cause overheating issues like stringing and oozing, etc…

    Not to mention that filament that has absorbed water tends to become more brittle, which can lead to the filament snapping off before reaching the extruder. As a result, a filament’s shelf-life is usually dictated by how quickly it absorbs moisture (and also whether UV from the sun weakens it at all, but that’s a lot easier to manage).



  • Rossphorus@lemmy.worldtoAsk Lemmy@lemmy.world*Permanently Deleted*
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    11 months ago

    New Zealand.

    Our laws make carrying anything with the intent to use it as a weapon (in self defence or not) a crime - whether it’s a gun, sword, pepper spray, cricket bat, screwdriver, or lollipop stick. This makes sure that when someone robs a corner store the owner gets jailed for having a baseball bat behind the counter. It’s absurd.

    The law not only doesn’t equalise your chances, it actively forces you to be at a disadvantage when defending yourself, and by the time any police arrive the assailant is long gone. Most criminals don’t have guns (except for the multiple armed gangs of course), but plenty of them bring bladed weapons, there have been multiple cases of machete attacks.

    I’m all for gun ownership for the purpose of property defence. Including strong legal defences for home and store owners repelling assailants.

    I don’t think just anyone should be able to go and purchase a gun no questions asked, it should probably be tied to some kind of mandatory formal training, e.g. participation in army reserves. It should definitely be more difficult than getting a driver’s licence (but I also think a driver’s licence should be harder to get than it is now. The idea that you can go and sit a written test and then legally pilot a two ton steel box in areas constantly surrounded by very squishy people is kind of absurd to me).


  • Here’s the generation statistics of the BN-800 reactor I mentioned before: https://pris.iaea.org/PRIS/CountryStatistics/ReactorDetails.aspx?current=451 It’s been operating at about 70% of it’s rated capacity basically since it was first turned on, that’s large scale power generation. Breeder reactors have been in commercial use for decades (see also: Phenix and Superphenix).

    The simple reason why breeder reactors aren’t the default is because most reactors don’t need to be breeders. The two main upsides of a breeder reactor is a) breeding of nuclear material, which as I said before was only ever a concern in the very early days of nuclear power. We have thousands of years’ worth of fuel available now. b) The reuse of nuclear waste for additional power generation. Of course you have to have nuclear waste to reuse first, which necessitates many other, non-breeder reactors already being in use, so breeder reactors are usually restricted to countries that already have significant investment into nuclear power, like France, Russia, China, etc… If you don’t need to breed more nuclear fuel, and you don’t have waste to reprocess you might as well keep it simple and build a regular LWR reactor.



  • There have been plenty. For example, the CANDU series of reactors developed in the 1950s and 60s. Breeder reactors were quite popular during the early days of nuclear power, as it was initially thought that there was maybe only 100 years’ worth of (easily accessible) nuclear material on earth, rather than the thousands (or tens of thousands) of years’ worth we know of now, due to both more reserves being discovered and also easier methods of fuel enrichment being developed. The fact that breeder reactors have fallen out of favour due to abundant fuel reserves certainly says something.



  • The MSP430 is just the chip I happen to use at work, if you’re not convinced you could try looking for an actual ultra low power chip, I found the STM32U0 at 70uA/MHz and the STM32U5 at 16uA/MHz in the first result.

    Even ignoring selecting a more efficient micro, a smattering of tiny ceramic caps will buy you a few hundred microjoules for bursts. If you’re already operating at 2V you can get a 6V rated 100uF cap in a 1210 package - and that’s after considering the capacitance drop with DC biasing. Each one of those would buy you 200 microjoules, even just one ought to be plenty to wake up for a few tens of milliseconds every second to get a reading from some onboard peripheral (as an example) then go to sleep again.

    For sure, you’re not going to be doing any heavy lifting and external peripherals could be tricky, but there are certainly embedded sensor use cases where this could be sufficient.



  • Unfortunately not. The major difference between an honest bot and a regular user is a single text string (the user agent). There’s no reason that bots have to be honest though and anyone can modify their user agent. You can go further and use something like Selenium to make your bot appear even more like a regular user including random human-like mouse movements. There are also a plethora of tools to fool captchas now too. It’s getting harder by the day to differentiate.