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>From: <Christina_Young@Wa*.Me*.co*>
>
>To all you physiology gurus out there,

Well I'm certainly not a physiology guru, but...

>
>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?  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?  Does Bruce monitor techdiver?

The approach taken in the RGBM is based on the so-called thermodynamic
decompression models which attempt to model bubble growth as
well as tissue saturation. They generate decompression schedules
by trying to keep the bubbles below some specified size.

The resulting tables apparently tend to have deeper and shorter
stops.

I like the approach as it seems intuitively to be a better model
for the actual physical processes involved than the Haldanean
models.

As to testing, I would imagine that if you had a model which predicted
the free phase bubble growth, you could correlate it with doppler
scores. I believe that this is one of the things Chris Parrett is
intending to do in integrating the RGBM into ABYSS.

I believe Bruce was working with Scubapro for a while on DC
design. I don't know how far that work proceeded.

Bruce doesn't follow techdiver as far as I know (looking at
his other activities listed in the bio in his books, I am
not suprised - he wouldn't have time!)

His last known email address was: brw@be*.la*.go*

Regards,

David.
______________________________________________________________________________
David Giddy,			                 |    Voice: +61 3 253 6388
Telstra Research Laboratories,                   |      Fax: +61 3 253 6144
P.O. Box 249, Rosebank MDC, 3169, AUSTRALIA      | Internet: d.giddy@tr*.oz*.au*
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