Nunsen Chai distributed heat source PDP-11 computation

Tom's student in the early 1980s, using a PDP-11/23 (16-bit, 10 MB hard drives at ~$1000) with weekend-long runs, extended Rosenthal's point-source solution to a distributed heat source on the GTA arc, computing variable depth-to-width ratios via Green's function superposition. Chai is now number two at Taiwan Semiconductor Manufacturing.

But in fact my heat source is not a single-valued point-located source, it's a series of heats. There's a distribution to the heat source. The Green's function can take all these solutions and put them into an integral. Now you have not a point heat source algebraic solution — you have an integral solution, and you use integral calculus. If you want to see this — I don't think I gave you the paper, maybe I did — it's a paper written by myself and Nunsen Chai back in the early 80s, using a PDP 11/23 computer.