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Christina: >To all you physiology gurus out there, > >Ralph Landry and I have been having a discussion on Bruce Wienke's >Reduced Gradient Bubble model. Is anyone currently testing it >out in the lab, or has it only been modeled and tested on the >supercomputer at Los Alamos? This was the topic of our discussion when Bruce was here on Tuesday. The model is fairly intensive from a mathmatical standpoint, and I believe he has run all of his tests at Los Alamos with his proprietary code written in Fortran. The model, or fractions there of, are currently in use on a submersible computer. >I am especially interested in >nu ^ exc (Greek letter nu) bubble factor, which he uses to >compensate for "deeper than the previous" dives, and if it >is possible to test this model with real tissues. > >Any thoughts? What are possible ways to test something like >this? Would you use doppler, or would that not be precise >enough? I believe he used doppler scores to establish the 1-2 hour post dive bubble rise that makes the RGB model so good for repetetive diving applications. But much of it is based on hard math of bubble compression, surfactent breakage, and expected excitation resulting in predictable nuclei growth. The math for multiple bubble growth he is writting for Abyss is really quite cool. We will modeling the body as though it has a wide range of bubble nuclei of varying diameters at the start of the dive sequece. Apply a crushing force to all of them based upon max depth, and then track the growth of those that become activated. >Does Bruce monitor techdiver? No, not that I am aware of. /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ Christopher M. Parrett, President, Abysmal Diving Inc. 6595 Odell Place, Suite G. Boulder Colorado, USA 80301 Ph.303-530-7248, fx 303-530-2808 Makers of ABYSS, Advanced Dive Planning Software. Available in English, French, German, Italian, Portuguese and Swedish. Abyss, Mixed Gas, Technical Nitrox, Recreational Air. Abyss, Technical Logbooks featuring 22 integrated databases.
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