metal_am

I’ll bite. The capability in the US to do large castings and forgings is basically gone. Good luck getting anything with a lead time of less than a couple years. In some cases, it simply can’t be done. That’s why we’re seeing so much investment into large scale additive manufacturing.

It’s interesting how this has become such a problem again. Post WW2, the US dismantled massive, basically building size hydraulic presses in former Nazi Germany and shipped them back to the US because that was a capability we didn’t have.

Pretty much! Also like an electron microscope. TWI says they can do 100kW

It's both.

"The new two-stage High Pressure Turbine section adds advanced coatings for cooling metal parts that will enable the same metal temperatures as today’s engines despite hotter gas path temperatures."

https://web.archive.org/web/20150418191419/http://airinsight...

Tuna can’t pump water over their gills. They can never stop swimming

Mouse Without Borders has been ubiquitous on all the SEMs I’ve used (where up to three computers can be used together). I’ve never had any problems with it. Now, the SEMs on the other hand…

I wouldn’t say it’s blocked in Tennessee. KUB (the Knoxville utilities company) recently introduced fiber

Grade 1 is still pretty common for ultralight backpacking items like pots and pans due to its ductility.

Must be library dependent. I only get 5 movies per month.

You'll definitely get asked about it, but there is absolutely no requirement to join to buy anything from REI.

When people talk about weight in this context, they really mean "base weight" not including consumables or worn clothing/shoes. The general rule of thumb is about 1lb/500g of food per day.

They’re usually actively heated/cooled

A lot of the code used in scientific computing cannot be vectorized because the latter loop is dependent on the former loop (like time stepping in a simulation). It’s not really a programming style preference.

There are some great government resources for books. Your state almost certainly has something that works with the Library of Congress. https://www.loc.gov/nls/ is a good starting point. You can also search something like “your state” + “accessible media”

It might be a bug, but it’s really interesting to draw with two or three fingers.

The article somewhat downplays the historical understanding of this. (It's understandable! This is a dense topic!) The impact of spin states has been known for a looong time. My first introduction to the topic was Zener's 1955 paper The Impact of Magnetism on Metallurgy.

Forms and tooling for composites are a big one in the aerospace world. Keeps dimensional stability better through autoclave cycles.

Grad student contracts usually prohibit you from having another job.

This is a thing at US universities. There are pure teaching professors, pure research professors (who might teach one class a year), and others who do both.

How about something like MAGMA?

Farming is a hard life. There are a lot of sources of stress:

Time - If something needs to be harvested immediately, it's not uncommon to work through the nights using the lights on the equipment. There's no such thing as set hours. You're constantly on the job.

Finances - Equipment is incredible expensive and is financed via debt but margins are low. You can end up just trying to pay off the loans. That's not even mentioning the land requirements (either owned or leased).

Uncertainty - You can't control the weather. You can't control the price of corn or soybeans. Equipment breaks down. These issues can easily snowball into affecting entire operations.

Film cooling and coatings are what allow operating temperatures above the melting temperature. That doesn’t mean the metal is above its melting temperature.

It’s definitely an expense. But this doesn’t fully explain why nuclear is expensive.

-Current nuclear reactors aren’t nearly hot enough to need single crystal turbine blisks. We’re talking on the order of 300°C.

-Coal power plant routinely hit much higher temperatures in supercritical and ultra-supercritical (yes, that’s a real term) steam generators. We don’t have quite as bad a problem building coal power plants.

-We’re not currently building molten salt reactors for power generation.

You didn’t say anything that was wrong. I’m just don’t think this is the reason building reactors is so expensive.

Yes! It runs pretty well on an M1 Mac edit: there’s a .dmg on the GitHub

Just because something is reflective in the visible light spectrum doesn't mean it's as reflective in other spectrums, say near-IR.

Platinum

To give some context for other parts of the country (TN): Gas is $2.92 and electricity is ~$0.11/kWh.

10,000 miles / 32mpg * $2.92/gal = $912.50 in fuel and 10,000 miles / 3.12mi/kwh * $0.11/kwh = $353.00 in electricity

OpenFOAM is open source CFD software

You can get kinda close to that with OctoPrint running on a RaspberryPi. You'll still have to slice it manually, but you can upload the gcode and start the print from another browser tab.

Laser powder bed fusion (L-PBF) of polymers was only in its infancy in the late 80s. This was research out of UT Austin that would eventually lead to DTM. Proper L-PBF of metals (fully melted, fully dense parts) didn't come about until the late 90s in the research world. L-PBF of metals wasn't really commercialized until the 2000s.

In any case, this is lightning speed for an industry that still produces something initially designed in the 60s (Boeing 737).

For more insanity, it was initially suggested to be a return to launch site (RTLS) abort test. The mission commander shut that down in a hurry. I've always thought it was interesting that Buran could fly autonomously while the Shuttle couldn't.