eric-hu
Joined 15 years ago
Joined 15 years ago
Is it though? I'd put forward that it's in the EU's interest to foster good international relationships. Countries can get away without domestic strategic industries if they can play nice with others.
EUV lithography and etching rooms require ISO class 1 clean rooms. Those can have a maximum of 10 particles of size 0.1 microns per cubic meter.
While a shopping mall can get away with 2 - 4 air changes per hour, an ISO class 1 clean room requires 400-600 an hour, or about 10 a minute. Airflow needs to also be controlled: vertical and laminar. Every human entering the cleanroom needs to undergo an air shower with speeds of 60-90 mph to shear off loose skin flakes, hair and lint. This area needs to maintain constant positive air pressure to repel outside dust as humans move in and out.
In the EUV lithography systems, temperature control is measured in milliKelvins (0.001 C). If a wafer stage has a temperature variation of 0.05 C, the silicon expands by a few nanometers and the multimillion dollar batch is toast. Meanwhile in the same room, the EUV machine is generating extreme ultraviolet light using a plasma light source that gets to above 200,000 C. That's 40x hotter than the surface of the sun.
> I always thought of these as high-precision, not-too-high-volume processes
EUV rooms are churning out about 150 wafers an hour, 24/7. That sounds like not too high of a volume, but each wafer is about 500 cpus. So 75,000 cpus an hour.
This is something I’ve been curious about. Can you speak more about how you got into it? What kind of research did you do before getting started? Did you know anyone else who had done it before you got into it?
https://www.extension.iastate.edu/grain/topics/EstimatesofTo...
That study uses 1,043.4 mpg for the fuel economy of a 100,000 dwt ship.
Videos of transportation ship engines are cool. Each cylinder is wide enough for a person to lay down inside it.
But wait just hear me out for a second! What if we've also sufficiently lowered the definition of "GI" at the same time...
These are gusty and dry winds coming from the desert, so I assume these fires spread from some manmade source.
> Does this suggest even bigger fires are to be expected in the summer this year when it is actually hot?
I would assume so, yes. Some insurers have been pulling out of CA in 2024.