> The idea that might can make right in the modern world turned out to be false;
The idea of racial might has been disproven, but international might (including allies) very much still makes right. The undisputed winners of WWII were the USSR and the US, both with internationalist ideologies and very strong industrial bases. One might say that inclusive might makes right. (Another lesson would be to stay out of the fight and build up industrial capacity, supporting your allies by proxy while the other parties wear themselves down.)
The USSR certainly didn't stay out of the fight; but your point is taken. Inclusive might was proven more effective than exclusive might.
One of these states collapsed and was replaced by nation-states which are more or less inclusive of minorities, more or less democratic; some very much so, others not at all. The other, although it still projects power around the world, is riven by internal dissent and the type of self-questioning of its own history and validity that would never fly in a nationalist, expansionist, authoritarian state like Germany or Japan during the war.
Some people think that's a sign of weakness for the US, but since the US's hold on the world hasn't lapsed perhaps we should consider it a sign of strength. In that case it's not just inclusive might, but self-reflection against the foundations of "might" that lets one write and rewrite history by appealing to people stuck in less flexible systems.
Does the NTSB look into train derailments? Would be interesting to see whether the systems engineering for trains hauling large quantities of industrial chemicals is on par with that of airlines. If not, it probably should be.
There are defect detectors on rail lines, "hot box" detectors [1] [2], that are infrared detectors used to observe and report bearing failures on a train. My understanding of the situation is that with the current rail labor configuration, railroad workers are only permitted ~90 seconds to verify the operational capacity of the wheelset on a rail car vs a previous average of 3 minutes.
Also, more importantly, someone at a railroad indicated "crews are no longer notified of the defects. The dispatch makes that call and then notifies the crew", which means train operators might not even be aware they have a dangerous car in operation (and the data indicates a bearing can fail outright within minutes of being observed as being "hot" [3]).
High level, this is a result of "Precision Railroading" [4], which is just a fancy term of running a railroad with just enough labor to continue to operate. Congress voted to prevent union railroad labor from striking [5], so what actions take place after this incident remain to be seen. The Purpose Of The System Is What It Does [6], and as designed, this system is configured to extract billions of dollars in profits from rail freight operations [7] while avoiding liability for any damages caused or labor costs that can be avoided.
Right now all this stuff have human involvement, but we're adding the building blocks to make software stop relying on humans for they day-to-day operation
Absolutely wrong. Minors can legally own their own property, including "IP". However, guardians can restrict a minor's access to that property. They cannot legally take it and assume ownership of it.
In other countries the population will unite after natural disasters, and leadership is usually given credit for the response as long as they continue support for local response efforts set up in the immediate aftermath. Why would popularity of the leader drop so quickly due to an earthquake? It's been what 36 hours. At this point almost all committed resources will still be highly local...
Potentially because they cut off social media essential to life-saving efforts, and focus on managing optics rather than providing concrete help? Just a stab in the dark, but who knows.
Well, either Erdogan knows he's deeply unpopular, so he/his lackeys has to censor all the bad news and criticism so he/they can look a bit better, or he's afraid he's deeply unpopular, which means a bit of self-awareness of what a raging asshole dictator but useless leader he is... Fun times!
A leader that actually cares but is overwhelmed would probably not be afraid of admitting that, s/he could rally the population together to overcome the tragedy despite their lack of resources. I think Dubya managed to convey this with 9/11, no one really knew how bad decisions by his administration lead to the threat being unnoticed. Meanwhile with Erdogan, he's been the boss for many years, the public probably thinks: The government's not able to rescue people effectively? Well, that's because it's been a kleptocracy for a long time.
While three stoves was probably ahistorical for most homes, a fire which heats the home and is also used to cook (food in ceramic containers) was absolutely commonplace. In particular, a controlled cooking fire in the center of a single-room thatched-roof home was the template for much of Europe, Asia, and for some of the North American natives, albeit at different points in their history.
Franklin stoves sold like hotcakes too, didn’t they? As an improvement over the hearth and the pot arm, which were themselves improvements over the three stone fire (which is still used by an alarming number of humans today).
Worth mentioning also (moving away from the poor now) wingback furniture, flannel pajamas with caps, canopy beds, bedwarmers with hot rocks or coals from the fire, three-piece wool suits during the day, etc...
Only need to look so far as Canada for financial supporters of a protest movement getting cut off from the financial system in midwinter. Now imagine that was centralized and could be done without informing anyone outside the central bank.
It is possible (and pretty easy) to use FreeCAD in a way that it will generate faulty STL files. It all depends on how you did the modelling in FreeCAD. I think it's an example of how there are many ways to accomplish something in it, but some of those ways are wrong -- and you won't know it at the time.
What I do when I get a faulty STL out of it is to use other programs to fix the STL. That gets me there. And many slicers these days (especially Prusa) are getting much better at doing this themselves, making it less necessary to do it as a separate step.
Hey there. Yes, I've had really good luck with exporting STL (and STEP) files for slicing in Cura or Prusa Slicer. My STEP files have been imported into MasterCAM for generating CNC milling gcode and it seems good.
As mentioned in a previous reply, a lot has been improved in three years so it's probably worth giving it another go and filing a bug if you find an issue.
I do a lot of this. Sometimes I do notice PrusaSlicer complaining about the geometry, but I can't remember seeing an instance where the export was broken beyond the slicer's ability to cope with it.
There might be something specific in your workflow that's running into a bug I see though. If you still see problems today it might be worth a bug report.
Just to add to this: 0.18 was the first version of FreeCAD I ever used. 0.20.2 is dramatically better in several important respects, to the point where 0.19 and even 0.20.0 feel like major regressions if I ever have to open them. It's well worth giving newer versions a try.
Yes, it works fine since years. I have made around 200 objects (and many iterations on each) using the Part Design workbench, that have been 3d printed with Cura. STL export has never been a problem.
I was going to disagree with you, but a back of the envelope calculation shows that the energy of computer production is probably equivalent to that of a few hundred hours of use, and so if you can save 10% on energy you are probably environmentally justified in switching to a new device. This is very counterintuitive to me.
To first order the upper bound for carbon cost of production/recycling is going to be a multiple of the energy required to melt the components. Call that multiple four: production of raw materials + reshaping in factory + recycling of materials at EOL + energy cost for assembly. So a rough upper limit of the energy to switch a computers would be four times the energy to heat the computer's mass in water (4 J/gC) up to the melting point of silica (1900 C), and a rough lower bound would be the same using the heat capcity and melting point of iron (10x lower heat capacity, 1500 C), and neglecting assembly. For 1 kg of material, that gives a range of 1.8 and 32 MJ. Now you can compare to the energy used. For myself, I'm on a 2 kg laptop that draws up to 250W, but conservatively 50W. That adds up to 32 MJ/kg in 400 h. If I can reduce the energy use by 5W with a new model, that will pay itself back in 2 years of workday computation. Crazy.
Caveat: there will be additional non-CO2 environmental costs. Most components are not recycled, and resource extraction is also environmentally damaging.
The only remark I'd have here is that the cost to produce is amortized over the course of producing several hundred or even thousands of units. It's still there but is greatly reduced per unit I think.
That's an American problem. The Amtrack sleeper I went on was much much more shaky than any of the trains I have been on in Europe or Asia (except for maybe a commuter train in Norway). I think it has something to do with running trains on rails with hundred year old wooden ties.
My guess would be that in order for a standalone air purifier to work one has to limit the ventilation, which quickly leads to high CO2 concentrations in small urban flats.
Yes correct. The CO2 increases by humans and air purifiers do not remove CO2 or bring in fresh air. To have the air purifier work effectively you need to keep your windows and doors closed.
> To have the air purifier work effectively you need to keep your windows and doors closed.
Isn’t it the case that you can open windows to the extent that the air purifier CADR can cope with the influx? Then they are still “effective”. The relative air quality inside and outside is also highly relevant. I say this as someone with AGs, since I frequently do this dance when CO2 rises.
If your outside air is clean enough that you can afford to open a window with a purifier running, you probably don't need the purifier. I have two Xiaomi ones running 24/7, with CADR 300-350 on both. In colder months (which are 7-8 per year) they're running at maximum speed for most of the time (~2300-2400 RPM). Every window and door is shut, all gaps are plugged with expanding foam. Even with all that, the indoor PM2.5 almost never goes below 2-5 µg/m³, with jumps up to 30-40 µg/m³ when it's really bad outside.
Opening a window even for a few millimeters is enough for PM 2.5 to go to a significant portion of what's happening outside (which is almost always hundreds of micrograms, sometimes thousands), and no purifier can beat that. Maybe if I put ten of them in a row, but it's expensive and noise will be unbearable.
I have 2x 400m3 CADR purifiers and 4x AirGradients to monitor to Home Assistant. But I live in a fairly clean air city. It’s the pollen count that can be high. I suppose my point was I often trade going from 0 to 6 PM2.5 to reduce CO2 from 1200 to 600 for a while. Whether or not that is smart is one for the jury.
Sorry, probably not much help from me here. I've been using DIY stations thrown together from ESP32 development boards and low-cost Plantower sensors (PMS5003 and PMS7003). They're surprisingly accurate — my measurements over the past three years closely match the official government data (which is collected using calibrated "professional" air quality stations priced at $10k or more).
It's cheap, but you have to do everything yourself. A friend of mine did something similar, but using ESPHome and Home Assistant, and I think he didn't have to write any code at all, just a bit of YAML to tie it all together.
Most indoor air purifiers have low purifcation thoroughput compared to the space they are designed for (30 min to 5% PM2.5 concentration migh be a typical filtration rate). If you model that as an exponential decay it's about 10% per minute, so a leak of unfiltered air which would replace 1% of room air per minute would result in a steady state of ~9% unfiltered air, or twice the contamination the filter was rated for.
It really depends on the outside pollution levels. In our experience indoor purification reduction with air purifiers correlate with outdoor pollution levels. So if it's really bad outside opening the windows just a little bit will already let a lit of dirty air on with which the purifier might not be able to effectively cope with.
The idea of racial might has been disproven, but international might (including allies) very much still makes right. The undisputed winners of WWII were the USSR and the US, both with internationalist ideologies and very strong industrial bases. One might say that inclusive might makes right. (Another lesson would be to stay out of the fight and build up industrial capacity, supporting your allies by proxy while the other parties wear themselves down.)