scuba (version 1.8-0)

pickmodel: Standard Decompression Models

Description

Selects one of a list of standard Haldane-type decompression models, identified by the name of the model.

Usage

pickmodel(model)

Arguments

model

The name of the model. A character string.

Value

An object of class "hm" representing a Haldane-type decompression model.

Note

If the argument model is missing, then the list of available options for model is printed.

Details

A Haldane-type decompression model describes the diver's body as a set of independent compartments connected directly to the breathing gas and governed by classical diffusion.

This function is a convenient way to select one of the commonly used decompression models of Haldane type.

The argument model is partially matched to one of the following:

"Haldane"

The original Haldane (1908) model with 5 compartments.

"USN"

The first model used by the US Navy, with 6 compartments.

"DSAT"

The DSAT model, with 8 compartments, underlying the PADI recreational dive planner tables.

"Workman65"

The model of Workman (1965) with 9 compartments.

"ZH-L16A"

The `theoretical' model ZH-L16A of Buehlmann with 17 compartments.

The result is an object (of class "hm") in the format required for use by commands such as haldane, ndl and showstates.

The data for the USN and Haldane models are taken from Wienke (1994), page 127 ff. The DSAT model is taken from Bookspan (1995), pp 16 and 23. The Workman 65 model is taken from Tikvisis and Gerth (2003), Table 10.1.1, page 440. The ZH-L16A parameters were taken from Buehlmann et al (2002) Table 25, page 158.

References

Bookspan, J. (1995) Diving physiology in plain English. Undersea and Hyperbaric Medicine Society, Kensington, Maryland (USA). ISBN 0-930406-13-3. Boycott, A.E. Damant, G.C.C. and Haldane, J.B. (1908) The prevention of compressed air illness. Journal of Hygiene (London) 8, 342--443.

Brubakk, A.O. and Neuman, T.S. (eds.) (2003) Bennett and Elliott's Physiology and Medicine of Diving. 5th Edition. Saunders. ISBN 0-7020-2571-2

Buehlmann, A.A. (1983) Dekompression - Dekompressionskrankheit. Springer-Verlag. Buehlmann, A.A., Voellm, E.B. and Nussberger, P. (2002) Tauchmedizin. 5e Auflage. Springer-Verlag.

Tikvisis, P. and Gerth, W.A. (2003) Decompression Theory. In Brubakk and Neuman (2003), Chapter 10.1, pages 419-454.

Wienke, B.R. (1994) Basic diving physics and applications. Best Publishing Co. Workman, R.D. (1965) Calculation of decompression schedules for nitrogen-oxygen and helium-oxygen dives. Research Report 6-65. US Navy Experimental Diving Unit. Washington DC.

See Also

ndl, haldane, showstates

Examples

   pickmodel("Z")
   ndl(30, model=pickmodel("Z"))