Although there were internal documents, I don't believe any public papers were ever published on this project. The group's purpose was to identify technologies and get a head start on medical technologies useful in the 10 to 15 year time frame, and the company kept the work quiet. This project was about building a gas chromatograph on a chip to analyse blood gasses in real time non-invasively. In addition to etching the chromatograph tube as a channel, we also fabricated an on-chip thermal conductivity sensor and a "no moving parts" valve and compressor using fluidic logic also on the chip. We actually had the components working and were looking at building an integrated prototype that would self-calibrate and be able to do 10 samples/second of samples obtained through the skin. My "vacuum tube on a chip" experiment was something I tried using parts from those other experiments. The interesting thing we found was that heaters became unnecessary when the dimensions got very small, due to "surface electron clouds" or tunnelling we didn't have the time to find out. I do have an SEM picture of the sensor (which also worked as a heater) which I have posted at http://www.eastjesus.net/tech/... if you're interested in seeing it. We worked closely with Dr. Henry Guckel at the University of Wisconsin. He was profoundly knowledgeable and helpful on that project and I later worked with him again on a separate optical computing/imaging project later (more on that elsewhere in that web site). If you haven't already, you might want to look into some of his other work which was published. Best of luck and let me know if I can be of more assistance.