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Chris, Okay, I've been using Kentucky windage. Keep up the good work. JC >At 10:40 AM 5/7/96 -0400, you wrote: >John: > >We have tried to address this very issue in the latest version of Abyss by >using the RGBM model. > > >RGBM/ABYSS Implementation > > The Reduced Gradient Bubble Model (RGBM) is a dual phase (dissolved and >free gas) algorithm for diving calculations. Incorporating and coupling >historical Haldaniean dissolved gas transport with bubble excitation and >growth, the RGBM extends the range of computational applicability of >traditional methods. The RGBM is correlated with diving and exposure data >on more complete physical principles. Much is new in the RGBM algorithm, >and troublesome multidiving profiles with higher incidence of DCS are a >target here. Some highlighted extensions for the ABYSS implementation of >the Buhlmann basic algorithm include: > >1. Standard Buhlmainiann nonstop time limits; > >2. Restricted repetitive exposures, particularly beyond 100 ft, based on >reduction in permissible bubble diffusion gradients within 2 hr time spans; > >3. Restricted yo-yo and spike (multiple ascents and descents) dives based on >excitation of new bubble seeds; > >4. Restricted deeper-than-previous divers based on excitation of very small >bubble seeds over 2 hr time spans: > >5. Restricted multiday diving based on adaptation and regrowth of new bubble >seeds; > >6. Smooth coalescence of bounce and saturation limit points using 32 tissue >compartments; > >7. Consistent treatment of altitude diving, with proper zero point >extrapolation of limiting tensions and permissible bubble gradients (through >zero as pressure approaches zero); > >8. Algorithm linked to diving data (tests), Doppler bubble, and laboratory >micronuclei experiments; > >9. Overall, parameters in RGBM/ABYSS are conservative, but flexible and easy >to change or fit to new data. > > > >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ >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/ > >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. > > John Chatterton
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