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At 02:12 PM 5/9/96 -0700, you wrote: >While there is some gas phase in the blood at start, tissues still are >modeled in bubble models. Abyss (RGBM) has compartments with >1,2,5,10,20,40,80,120,240,480 and 720 min tissue half-times. > >I was stating my feeling that somehow the models seem to get more >unpredictable at the middle tissues. As I get closer to the filling of >the middle tissues, I seem to get more fatigue. However, I may not have >enough experience to make a significant statistical universe. While gas >phase is cause of the DCS symptoms, how the tissues add gas phase as >they supersaturate still controls the number of bubble seeds. > Abyss uses 32 compartments for the 4 Inert Gases we track and Model. As well, we use Dynamic halftimes for all of the compartments. As an example. For Nitrogen, during the Ongassing phase using the Abyss 150 Algo we use the following halftimes for the 32 compartments. As you will notice this has allowed us to refine the middle tissue zone much better than the other models. 02.65, 05.30, 07.94, 10.07, 12.20, 15.37, 18.50, 22.53, 26.50, 31.80, 37.00 45.05, 53.00, 66.25, 79.00, 96.73, 114.0, 129.8, 146.0, 165.6, 185.0, 212.0 238.0, 271.6, 304.0, 351.1, 397.0, 450.5, 503.0, 635.0, 795.0, 1060. This array is then modified to account for thermal stress and workload, as well as changing from Ongassing to Offgassing. The end result is that we have well over 100 halftimes per tissue per gas in use while computing decompression. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Christopher M. Parrett, President Abysmal Diving Inc. 6595 Odell Place, Suite G. Boulder CO, 80301 USA Makers of ABYSS, Advanced Dive Planning Software. Phone: (303) 530-7248 Fax: (303) 530-2808 File Transfer Site: ftp://abysmal.com/users/abysmal NEW WWW Site... World Wide Web Site: http://www.flinet.com/gulfstream/abyss/
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