brennanpeterson

5 ms·

1.
by brennanpeterson 1mo ago
Why? It then proves nuclear is uneconomical? Regulatory arbitration like this serves nothing? Don't get me wrong, I would love to see more nuclear, but bad nuclear is not in fact better than none.
2.
by brennanpeterson 2mo ago
So prayer beads aren't meditation? Indian traditionalists are out. Walking isn't, so zen is out. Chanting isn't, so.i guess all bhuddism is pretty much not ok. Maybe there is no true meditation. It is ok to be focused and min
3.
by brennanpeterson 2mo ago
Semiconductors are also incredibly risk averse, and requires fairly large gains to be worth the risk. There are domains (or, mems, photonic sensing, high power) where innovation has a bit more flexibility for the early going.
4.
by brennanpeterson 4mo ago
Well, you are working from all sorts of misguided assumptions about how you convert, the yield, the efficiency, the shared capital, and history. Old gen logic barely exists, and won't convert. The tools are wrong so it wouldn't yi
5.
by brennanpeterson 4mo ago
"If by some fiat I had to restrict all this writing to one sentence, this is the one I would choose: The summit of Mt. Everest is marine limestone." John McPhee from the wonderful Annals of the former world
6.
by brennanpeterson 4mo ago
It would be nice to have portfolios, but systems are broken enough that that becomes hard to see. I suspect one of the reasons for the bias to hiring PHds in fields where it really isn't necessary is at least you have a work portfolio.
7.
by brennanpeterson 6mo ago
My work laptop will stall on resize constantly, and I suspect it is due to the mess of security and backup software. Windows does have an ecosystem problem. I am also baffled by the multiple control points. I can log in to mail in 3 places.
8.
by brennanpeterson 7mo ago
None for normal.compute, since energy density is still fundamental. But the interesting option is cryogenic computing, which can have zero switching energy, and 10s of GHz clock rates Some neat startups to watch for in this space.
9.
by brennanpeterson 9mo ago
Group theory and crystallograpy without either word? I suppose I can look at this as an extension of group theory to glassy and partial.domains, but it doesn't appear to offer much more. Columnar basalt formation has been understood f
10.
by brennanpeterson 9mo ago
I also quite liked https://ocw.mit.edu/courses/res-6-011-the-art-of-insight-in-... Which is, I think, the successor and quite useful.
11.
by brennanpeterson 10mo ago
Variance, data rate/cost, and lithography. You can do lithography small but slow and expensive. But small means you need a stack, which is even more expensive. At small sizes, defectivity/variation are really difficult. So if you
12.
by brennanpeterson 10mo ago
I wonder if that is why it worked as opposed to why it sold. At least, as one of the users in that time it seems to me that the itch was the document repository with some features, and the rest was fluff for purchasing to sign off on. All
13.
by brennanpeterson 10mo ago
This isn't true. It used to be, as a new fab would appreciably add quantity. At 1M wspm in 2015, a new 100k fab at the most modern node would add effectively 20-30% capacity, and usually multiple.players at once, since all had cash. No
14.
by brennanpeterson 1y ago
Or The Crossing, which, at least for the first third is his sparest and best writing. At least, I prefer the marriage of the gothic sensibility and poetry with the classic western.
15.
by brennanpeterson 1y ago
Not sure on limbs, but for fast bone and tooth repair it works. https://www.nature.com/articles/srep31724
16.
by brennanpeterson 1y ago
We aren't far at all from on chip combs or pseudo combs, and that will be fine. More for sensors generally, but you can also have your clocks.
17.
by brennanpeterson 1y ago
Please tell me how to make a water prism to test compressive strength and deformation resistance. Water is an incompressible fluid, that is different. These are well understood terms in the field. Unfortunately, this illustrates the bounds
18.
by brennanpeterson 2y ago
The sram density is a pretty good equivalent. You can arguably do the average of sram and some logic. If you take the square root of that...you pretty much end up with (modulo a linear scale) the existing nodes. That gets you size. You then
19.
by brennanpeterson 2y ago
Spin in is an interesting tech history. As for cvd low-k, it is mostly how much C is in your silicon, and likewise how you setup the damascene etch stop. Intel was low-ish k in about 2002 on 130nm. I am not so sure tsm was first. Depends on
20.
by brennanpeterson 2y ago
Probably done with 3 separate litho/etch layers, where they etch and process in groups of 110 or so. Each of those layers can have a cell, so if you have a tlc device at a 100nm pitch, you have a density of 321*3/(1e-4)^2 bits&#x2
21.
by brennanpeterson 2y ago
It exists, though I don't know of any free or open versions
22.
by brennanpeterson 2y ago
But there are great books in this area? https://www.statlearning.com https://www.stat.cmu.edu/~cshalizi/ADAfaEPoV/ There are other fine ones, but these are very good.
23.
by brennanpeterson 2y ago
Lithography lives in the thin film approximation anyway. Timiosheko is a good reference. There are papers from Barnett or Nix that are very nice, but edges will probably end up a fem solver domain.
24.
by brennanpeterson 2y ago
True! I went a little far in the name of 'eli5'. I think it roughly holds that you gain about a factor of 1.5 in routing density by removing the power distribution, so you can relax some critical patterning. But I havent looked cl
25.
by brennanpeterson 2y ago
I am not sure where that would come from. There is nothing about dsa that means this. Dsa is one of many patterning assist technologies, just...an old one. Neat, but not 'new'. You use patterning assist to make smaller, more regu
26.
by brennanpeterson 2y ago
Half your wires deliver power, half deliver signal. So if you do both on the same side, you need twice the density of wires. If you split the delivery into two parts, you get double the density without needing to make things smaller.
27.
by brennanpeterson 3y ago
The benefit of X-ray is they go through everything (so you can see metal). The problem is they go through everything, so you have little signal. For metal/bump voids, hard to inspect any other way The harder problem for X-ray inspectio
28.
by brennanpeterson 3y ago
You are correct. You can do mask edits or short runs in some cases beam. Even more interesting is mask level overlay and CD correction using ultrafast absorption based stress fields. There are some heat technologies out there
29.
by brennanpeterson 3y ago
Very capital intensive means operating costs (wages) are a small percentage. A trailing fab has very few people running the operation. This will be a trailing fab.
30.
by brennanpeterson 3y ago
It isn't complex at all. Take the average density (average of sram and logic), take the square root of that, and you have (barring a factor) the node. The best way to understand the dimension is to look at the contacted gate pitch m2 p

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