• 0 Posts
  • 28 Comments
Joined 1 year ago
cake
Cake day: June 30th, 2023

help-circle
  • Porque no los dos?

    Rabbit hole incoming: If you have to pick one, I suppose it depends on what metric you are trying to maximize. One doublestacked intermodal train car takes two long haul trucks off the road. One Siemens Venture passenger train car takes 74 people, or about 50 cars at 1.5 people per car, off the road. You can generally run longer freight trains than passenger trains, but 25x to normalize for VMT (which could be used as an approximate measure of direct health impacts from driving: crash risk, elevated blood pressure, obesity. It could also be used to approximate societal impacts of car culture: real estate dedicated to surface parking, voting bloc size that supports car-centric planning and development regulations) is probably excessive. On the other hand, if we normalize for emissions (hard to find data here, but as far as I can tell trucks are on the order of 10x as emissive), that gets us down to 5x train length, which is about on par (northeast corridor trains are typically in the 1/6 of a mile range, and median freight train length is somewhere in the 1-1.5 mile range from what I could find), and if we use infrastructure damage/maintenance cost (trucks are about two orders of magnitude worse than even today’s SUV saturated passenger car market, I’m assuming without reason or evidence that damage to steel rail infrastructure between a freight and a passenger car scales significantly less harshly for the sake of simplicity), things look downright strongly in favor of freight traffic. At the end of the day, it probably just depends on which use case has more unmet demand on a case by case basis. Of course, both pale when compared to the opportunity that high speed rail gives to take short haul flights out of the sky, but that is another set of analysis and does partially correlate to the elevated infrastructure cost of high speed rail vs conventional rail.










  • Hign speed rail is really more effective at cutting down short domestic flight and the number of cars driving on interstates than it is at enabling car-free lifestyles. Not to say it doesnt help with that, but the correct tool for that job is local transit and bikable/walkable communities, which both Houston and DFW are working on, even if they are under constant threat of regression by the irresponsible actions of TXDOT aka the highway widening mafia


  • If someone is being paid to work in those expensive areas, the pay should be sufficient to live in or near those expensive areas. It’s entitlement for the employer class that this isn’t the case. The implications of it not being the case (the existence of a class of people in these areas that struggle to afford basic necessities, the extension of psyche-degrading and environmentally destructive commutes, the tearing apart of our societal fabric that comes from isolated suburban commuting living) are all horrificly negative at scale. You may live and work in a situation that is independent of those negatives (you found a good enough paying job in a low cost of living area, or maybe even you work remote, or you don’t mind the isolation and destructive nature of the exurban commute) and that is good for you, but to imply that the whole nation needs to follow your example or stop complaining shows a sore lack of awareness about how scalable the solution you personally found is.









  • Blower is specifically referring to coolers that are designed to blow air through the GPU heats ink and then out the back of the case. In contrast, open air coolers use (typically more numerous and larger fans) to force air at the GPU heats ink but without much concern for where it goes after that, so the air ends up partially blown out the back of the case, and partially recirculate back into the rest of the case where the case fans are hopefully promoting enough exchange that ambient temps remain sufficiently low. The recirculation is less than ideal, but is offset by the larger fans and heatsinks for a typically quieter and cooler solution. The fans can be larger because they are blowing on the larger side/cross section of the heat sink. Pass through are a somewhat newer variant of open air coolers common on newer Nvidia cards that push or pull air through a heat sink that is not blocked on one side of a pc so air flows though the heat sink with less back pressure for more efficient dissipation at the expense of a more compact PCB to put all the GPU components on