This is a terrible take, and I say this having a PhD in Physics.
Many physicists have written popular articles and books for the general population. Eg Einstein, Stephen Hawking, Brian Cox. Improving accessibility of advanced concepts is nothing to scoff at.
Somehow I got a 7 out of 9, even though I felt like I was mostly guessing. Surface vs deep lines have more rumble but that’s about it that I consciously knew of.
I did a bunch of research on similar Tc superconductors back during my
PhD.
7K is considered “warm” from a cryogenics point-of-view because you can just dunk your sample into a dewar of liquid helium at 4.2K. You can even get it cooler, down to about 1K, using evaporative cooling techniques. [1]
It’s getting to lower temperatures than this when things start getting complicated. Eg a closed-cycle evaporative He3 system can get you down to 200 mK, or you can bite the bullet and use a dilution fridge down to around 10mK.
FYI link is below, for the off-chance someone is curious.
(not sure what are the unwritten rules of self-promotion here, but hopefully providing a link in a sub-comment instead of the comment itself makes it okay-ish?)
Does annybody worry about sabotage if you don’t tip? Eg the cashier does something to your food? “Nice muffin you got there, I’d hate for it to get accidentally sneezed on.”
I recently bought my mom flowers for her birthday. Despite the price showing no delivery fee, the final price included $15 delivery charge, $8 service charge, taxes, and then asked me for a tip.
I chose no tip, expecting the delivery and service charge should cover everything.
The flowers were left on her front porch in below-freezing weather, they didn’t even knock or ring the doorbell. Luckily my mom happened to open the door and saw them before they completely froze.
So was the delivery person incompetent, or acting out because I didn’t add additional tip?
Two thoughts on situations where the 555 may be preferable, if anyone has experience how these compare :
1. Low-noise applications. I’d naively expect the 555 to be less noisy than a clocked digital microcontroller, though it’s been awhile since I’ve worked in this space.
2. Low power applications. How does latent power draw compare between a 555 and a typical low power microcontroller?
> Low power applications. How does latent power draw compare between a 555 and a typical low power microcontroller?
The 555 is very power hungry compared to a typical cheap low-power microcontroller. IIRC there are lower power variants but the 555 still fundamentally does timing by draining current through a resistor, which is going to result in losses.
> I’d naively expect the 555 to be less noisy than a clocked digital microcontroller
TTL ones were exceptionally noisy because the output transistors "shot through" - both output transistors would conduct for a moment shorting the supply rail to ground and crowbarring ridiculous interference onto other parts of the circuit.
And there's another reason not to recommend them - no one sane has used the bipolar version since the Carter administration but they're still out there and it's another pitfall for beginners.
"Home & Garden Television". Lots of shows about flipping houses, etc.
It used to be far more instructional (Julia Child-esque) before it and Food Network got swept up in the reality TV craze. It still has the "bones" of its former self though.
Many physicists have written popular articles and books for the general population. Eg Einstein, Stephen Hawking, Brian Cox. Improving accessibility of advanced concepts is nothing to scoff at.
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