nthompson

Automatic differentiation only works on functions which are locally complex analytic. It fails on things that fall outside that model, but are still differentiable. Daubechies wavelets are a good example of this.

They do not have their own power station. They have the Bull Run coal plant and hydro plants in the area. They do coordinate with TVA before a run.

Pulsed femtosecond lasers have repeat rates in the megahertz. The total energy is very high. When I took laser physics in grad school, they were able to drop a razor blade through the beam and slice it in half. That was in 2013.

So yeah, pulsed lasers can do it, and I'm certain the Air Force would rather be using them. They are finnicky though.

The product lineup is solid; even if they go bankrupt, the debt owners will simply wipe out the shareholders, prune away the less profitable parts of the business, and scale back the expensive R&D ambitions. The Model 3 will still be produced since the fixed costs are already paid.

(Not my view that they actually will go bankrupt. But failure due to overspending on fixed costs tends to work out differently than being unable to cover marginal costs.)

Yeah, but medical bill collections has way less weight on your credit than (say) a car bill past due.

They send so many people to collections that even creditors don't care about it anymore.

Do you work in medical billing? My experience is just the opposite, they try to extract marginal costs from those people.

Buddy of mine breaks his collarbone, gets some pins put in. They drop him a bill for $25k.

He says "I'll give you $1500 now, or you can send me to collections."

They took it; now I use this technique all the time.

They make up a number which is how much they hope to get out of you, and you should return the favor by make up another number. Then scream at each other on the phone for a few hours before coming to terms.

Sad that it's come to this, but medical billing is a shell game. You can play it too.

He's making a joke that the arbitrage could generate infinite amounts of money by generating clean power with coal power.

haha they ought to try that.

The Idaho legislature is totally dominated by farmers (I mean this literally: The Idaho congressmen are primarily farmers.). These farmers are allowed way better deals on hooking up solar and providing it to the grid than city consumers. In addition, a large number of farmers already have solar panels since grid hookups are very expensive.

The "California arbitrage" has been very profitable for Idaho for many years: This involves selling California renewable hydro, for which they pay a premium, and buying coal from Utah to replace it. (Ever driven north of SLC to Idaho on I-15? Those high voltage transmission lines are there for a reason.)

If I had to bet, I would suspect the lines from the Nevada coal plant also supply California, and Idaho Power will sell the solar production there.

Location: Knoxville, Tennessee

Remote: Yes

Willing to relocate: No

Technologies: C++/HPC/Python/JS/Numerical Analysis/Signal Processing

Email: [email protected]

I have written multiple scientific desktop apps, scientific web apps, written multithreaded and CUDA HPC codes in C++, lots of scientific Python code for low-CPU apps, scientific visualizations in Three.js and D3.js, and I wrote much of boost.math, which you can clone and look at my commits. My boost commits are basically a list of "glue" tools for my projects, quadrature, denoising, interpolators, statistics, so on. Fairly experienced in Eigen for linear algebra.

Can you selectively grow semiconducting tubes, or metallic tubes, or do you only get a mixture of semiconducting and metallic?

That sounds tough. You also have a code size/speed trade off that must be managed. Where did yours land?

Awesome list of questions, btw.