Decompression.org ftp site

Folders full of decompression-related technical articles and computer code are at the site:

ftp://decompression.org/pub/

My folder is:
ftp://decompression.org/pub/Maiken/

Therein, I've placed a series of quantitative comparisons between VPM-B and other popular decompression methods.

For a wide range of depths and gas mixtures, the commercial programs V-Planner (running VPM-B) and GAP  (Running RGBM and Gradient Factor) produce VPM and RGBM tables that are linearly correlated. For many dives the decompression schedules under the two methods are virtually identical. On the other hand, the GF tables generally require much longer decompressions for long bottom times. So, VPM and RGBM tables are much more similar to one another than either is to GF.

During 1999 and 2000, David Yount, Erik Baker and I collaborated to extend the VPM decompression algorithm to model repetitive, deep decompression diving. The following material includes publications as well as behind-the-scenes discussions of technical aspects of the VPM as applied to the real world of diving.

UHMS Meeting
Stockholm, June, 2000.

David Yount passed away just prior to this presentation of the details of the latest development of his VPM diving decompression algorithm. 

Mahalo David! How fortunate you were to see your pioneering work in decompression theory come to fruition.

A poster, in powerpoint format, describes A New VPM Algorithm for Repetitive Dives , David E. Yount, Eric B. Maiken, and Erik C. Baker

The Reverse Diving Profiles Workshop
Washington D.C., November, 1999.

The RDPW conference was reviewed on pages 4,5, and 6 of the Spring 2000 issue of the the EUBS newsletter (European Underwater and Baromedical Society).

The "VPMechanics" Series of Mathematica Notebooks

RDPW3A.htm Tracks the compartment tensions and supersaturation gradients of a reverse dive profile posted by Erik Baker on the deco mailing list. 9/13/99

VPMechanics1.htm Discusses the VPM algorithm, with application to a 100 fsw air dive. 9/14/99

VPMechanics2.htm Looks at the time dependence of the supersaturation gradient for the air dive in VPM1 and evaluates the integral of Pss as a risk function. 9/15/99

VPMechanics3.htm Considers the roles of actual dive depth and equivalent air depth in setting ascent schedules in air and nitrox diving. 10/22/99

VPMMechanics4.htm Evaluates VPM supersaturation gradients throughout the permeable and impermeable regimes. 9/23/99 

VPMechanics5.htm Joins the hypobaric and hyperbaric forms of the VPM M-values. 9/26/99 

VPMechanics6.htm Looks at how the VPM parameters and dive conditions affect the allowed supersaturation gradients. 10/4/99

VPMechanics7.htm How a diver's descent rate influences the minimum ascent gradients.  10/23/99

VPMechanics8.htm How a diver's ascent rate affects the minimum ascent gradients. 10/14/99

VPMechanics9.htm A close look at the dynamic critical volume method for non-decompression diving. 11/1/99

VPMechanics10.htm Repetitive diving and the VPM. 11/1/99

Technical Notes on Bubble Model Decompression

Technical VPM

Technical RGBM