Generally, capsules that burn up in the atmosphere rather than landing are useful for boosting, but if you have to have a heat shield on the bottom of your spacecraft (and the docking port generally on the top), you can't have thrusters that point along the center of mass line of the station. Dragon's thrusters aren't quite so well pointed due to this problem, so boosting with dragon would be very inefficient.
Isn't this a bit dated? I certainly agree that the shared memory semantics are a critical distinction, but in addition to the 256Kb per SM shared memory, NVIDIA Volta GPUs have 128kB L1$ per SM, and a unified 6MB L2$. I don't think these caches are entirely /not worth discussing/.
Attribution of weather events is a nontrivial task due to the complexity of weather systems. This is one of the groups that does: https://www.worldweatherattribution.org/
Tldr, climate change is making many (but not all) of recent extreme weather events more likely or more extreme.
We looked at using these in a previous job that had a very tight tolerance on RF frequency tolerance. Vibration tolerance makes the use of crystals difficult.
Unfortunately, the phase noise of this device wasn't good enough to be the frequency source for the radio itself, so we would have had to use the CSAC to discipline a tcxo. By the time we did that, it really wasn't that advantageous.
It looks like they have a low-noise option that includes a tcxo now, but (no surprise), it doesn't appear to have a operating vibration spec.
What you're looking for is Trust Vector Control(ler). Most modern rocket engines physically gimbal the engine around with ~two linear actuators around a fixed point at the top of the engine. All of the plumbing and connections to the rest of the rocket must then be flexible.
I still have this problem where my mom's iMac will occasionally send a SMS (sent via macOS Messages and delivered via her iphone) to the email address in my contact, rather than my phone number. Somehow it thinks that xxxx@yyy.com is a phone number, but +1xxxxxxxxxx isn't. Tmobile then takes the SMS and forwards it to xxxx@yyy.com, as happened to you. So frustrating at how hard this is for Apple to get right. I don't even have iMessage, but I guess that's the point -- interoperability, where it exists with Apple products, will be usable enough to get started but just buggy enough to be infuriating.
Thermally, the helicopter cannot keep itself warm through winter due to decreasing solar power generation. Over the next few months, as the solar generation goes down leading into winter, the energy available for flight (rather than survival) will decrease and go negative at some point.
You've brought up the key piece here, the scope of refurbishment. If engines become a Ship of Theseus problem, then it compromises the idea that age proves a particular engine serial number reliability. I think there's a difference between the design overall being reliable (which I agree RS25 has shown), and lifetime improving a unit's reliability.
For comparison on refurb, a Falcon9 first stage with 9 engines is refurbished for $250k[1], while refurbishing 16 RS25 engines (and building a new engine controller) cost $572M[2]. Shuttle and its components weren't reused, they were rebuilt, and this (probably unfair) cost comparison shows it.
I think saying they're 'super-reliable and battle tested' is a bit strong. The SLS program has been plagued by engine problems in the last year. They've already replaced at least one fuel (preburner?) valve, and had issues with the ox (preburner?) valve during the green run.
Rocket engines are hard, they're eternally finicky. I think there are very few engines in the world (SpaceX Merlin might come close) that reasonably get more reliable after more use; RS-25...I would not put high on the list.
I gave up on reporting bugs to Apple a while ago. The experience, repeated several times over, of spending all the time to file a radar, gather all the logs and files that Apple insists on (probably reasonably), then submitting the thing and getting exactly zero feedback for the next year when you are then told to repeat all the same work on a new macos version or the radar will be automatically closed, is demoralizing. Mind you, the issues I reported were fixed/went away a few years after that (so clearly not as a result of the then-long-closed ticket), but the process just feels like a waste of time to interact with the black box of apple.
Oh goodness I thought this was just me after searching online and finding very little, if any, discussion of the bug. The issue I had wasn't on password login prompts, but on account creation prompts (i.e. password+confirm password). I had assumed it was lastpass at first, but the freeze persisted even after removing that -- on a one-day old computer.
There is truth to this in aerospace: components will be qualified to the design life of the vehicle, but the qualification campaign is intentionally conservative to envelope all possibilities and uncertainty. When the actual conditions are more benign, more life can generally be expected.
Additionally as another case, Hubble has been continuously losing gyroscopes since it was first launched. Some or all gyros were replaced during most shuttle servicing missions. Seeing the writing on the wall for servicing missions post-Columbia, NASA developed software to operate with fewer gyros at a time, allowing for fewer to be spun up at any time, but importantly, allowing for the telescope to continue to operate after more than 3 of 6 gyros had failed. The key here is that engineers can often coax more performance out of a damaged (or otherwise limited) subsystem given the incentive- this has been the case in my aerospace experience, and seemed mirrored with Hubble too.
People lose money in the stock market all the time. This feels similar to me--people bet on the market and were on the wrong side of the trade. I do have sympathy for people who are having financial trouble as a result of their decisions here, but there isn't serious talk about banning speculation on stock markets because some investors might make bad trades.
'People' can simply choose a different electricity retailer if they want a constant rate and to not worry about this. If they were adequately informed about risks, why shouldn't we be allowed to choose our path? Industrial customers usually buy on the wholesale market, it doesn't seem a stretch that consumers could benefit from that too.
Semi-related: I don't know about this image in particular, but many images taken off-Earth have their white balance adjusted so they look the way they would under Earth lighting. I'm aware this is done frequently for images from Mars, where the images are adjusted so Geologists can compare Martian rock colors to those of their Earth experience.
The helicopter doesn't have enough power generation to stay warm through the Martian winter; the solar panel that feeds it is extremely small, so at the very least, it is unlikely to last beyond the summer. Here's the thermal design paper for the helicopter:
Newpipe is the first video player I've found which has a trim-silence feature. I use the similar feature for (audio) podcasts all the time and according to pocketcasts, it saves me huge amounts of time. I've enjoyed having it for videos too.
I couldn't find it in the article if it was addressed, but I'd like to see 2017-era microcode used in the mitigations=off testing as well, to see how much of a difference that makes.
If I understand your point correctly, I think what you're describing is "engineering". This deep thinking seems like 'science' to me, while putting together those pieces of theory into new and exciting practice (products) does seem like an award - I think many people on this site are financially well compensated for such engineering, prizes and awards notwithstanding.
They no longer do this, and are now happy with just testing li ion products. There are iPads all over the station (and used by the astronauts on the SpaceX Dragon)
I think you're overestimating the difficulty of moving 500A. As GP said, liquid-cooled cables are the solution and come in reasonably-sized cable thicknesses (CCS form factor). This is ITT Cannon's product as an example: https://ittcannon.com/core/medialibrary/ittcannon/website/li...
Also note that 1000V isn't an upper bound; many vehicles under design now will be ~1000V, and I expect that to push up to at least 1500V within the next few years.
True, however this is a far smaller variation ("several tens of percent" [1]) and only happens slowly (~once per day). This is in contrast to gas turbine peaker plant with can ramp by 10-20%[2] of rated power per minute.
Specifically your point about bunker fuel, this is now out of date a bit. The International Maritime Organization rules about ultra-low sulfur fuels came into effect 1/1/2020.
Ironically though, this just affects sulfur, and so while a lot fewer people will die of air pollution as a result, the reduction in particulate matter (and complementary rise in greenhouse effect) is actually predicted to result in a marginal increase in global temperatures.
I agree with you that much of the environmental movement in the West feels inadequate or focusing in insignificant problems (plastic straws anyone?), but from my experience in the renewable industry, people are talking about this, just too few of them.
Definitely agree. However, the long tail will likely include discovering some more 'improbably' results. For example, the researchers who ultimately discovered Phosphine on Venus this week had early requests for observation time on telescopes denied and seemed to have to have been extremely persistent to finally get their chance.
One answer is to stack 3 LEDs on the die, each tuned to the center wavelength of human photo-receptors. Existing RGB LEDs emulating "white" suffer from shadowing effects where shadows have a color based on the parallax between the red, green, and blue elements in the light bulb. This is no longer an issue if you co-locate the emitters.