| A Comprehensive Strategy for Saturation Decompression with Nitrogen- Oxygen |
04 FEB 85 |
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| Authors:
R. D. Vann; DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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 | This paper began by discussing an empirical method for finding the ascent rates from saturation dives. These rates were estimated in a subsequent analysis. The estimates are easily modified and can be refined with additional data and other decompression models. A brief review of doppler bubble measurements suggests several conclusions. First, the relationship between bubbles and decompression sickness is qualitatively similar for a variety of decompression exposures. Second, most decompression ... |
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| Decompression Mechanisms and Decompression Schedule Calculations |
20 JAN 1984 |
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| Authors:
R. D. Vann; DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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| A theoretical method has been developed to predict space craft and space suit atmospheres. The method used to analyze stage decompression procedures which have been tested for the Shuttle. The effect of exercise during compression and bottom time has been studied with rats during an 18 minute air dive at 350 fsw. Seventeen resting rats and 27 exercising rats out of 2 groups of 108 rats developed decompression sickness. A ... |
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| A Theoretical Method for Selecting Space Craft and Space Suit Atmospheres |
1984 |
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| Authors:
R. D. Vann; J. R. Torre-Bueno; DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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| A theoretical method for selecting space craft and space suit atmospheres is described. The method assumes that gas bubbles cause decompression sickness and that the risk increases when a critical bubble volume is exceeded. The method is consistent with empirical decompression exposures for humans under conditions of nitrogen equilibrium between the lungs and tissues. Space station atmospheres are selected so that flight crews may decompress immediately from sealevel to station ... |
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| Decompression from Saturation Dives |
84 |
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| Authors:
R. D. Vann; DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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| During the early 1970's, about 20 helium-oxygen man-exposures were conducted at Duke University to depths of 720 to 1000 fsw for bottom times up to 4 hours. Decompression took place on a modified Buhlmann scheldule with an inspired oxygen partial pressure (P102) of 0.8 ATM. Decompression sickness was rare, but pulmonary oxygen toxicity forced a reduction in P102 to 0.6 ATM. In subsequent dives at this lower P102 with the ... |
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| Air and Nitrox Saturation Decompression: A Report of 4 Schedules and 77 Subjects |
84 |
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| Authors:
R. G. Eckenhoff; R. D. Vann; DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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| The third schedule (US Navy heliox saturation decompression schedule) appears to produce a higher incidence of DCS than the other schedules when used in air or nitrox exposures. Keywords include: dividing; humans; decompression; inert gas; saturation. |
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| Decompression from a Deep Nitrogen/Oxygen Saturation Dive. A Case Report |
19 OCT 1983 |
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| Authors:
P. D. Barry; R. D. Vann; D. A. Youngblood; R. E. Peterson; P. B. Bennett; DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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| Ten divers participated in a 4.5 day nitrogen/oxygen saturation dive to 165 fsw. There were daily 2 hour excursions to 200 fsw. The divers breathed air during the excursions and 0.5 ATM oxygen in nitrogen at 165 fsw. The final decompression began 6 hours after the last excursion. The oxygen partial pressure was 0.5 ATM from 165 to 45 fsw, and air was used from 45fsw to the surface. By ... |
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| Air and Nitrox Saturation Decompression: A Report of 4 Schedules and 74 Subjects |
1983 |
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| Authors:
R. G. Eckenhoff; R. D. Vann; DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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| Seventy-four subjects were decompressed from air or nitrogen-oxygen saturation exposures at 60 to 132 feet sea water gauge (fswg) using four different decompression schedules. A twenty hour schedule for decompression from an air saturation-excursion profile at 60 fswg resulted in pain-only decompression sickness (DCS) symptoms in two of twenty-three subjects. A thirty- two hour schedule from a different air saturation profile at 65 and 75 fswg resulted in DCS symptoms ... |
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| The Development of Predictive Engineering Formulations for Diver Heating. Volume 1 |
1982 |
204 pages |
| Authors:
Charles E. Johnson; James D. Collins; DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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 | Predictive heat transfer equations have been developed to estimate the local supplementary heating necessary to support a resting diver. These formulations consider the diver's passive thermal protection in the form of a diving dress and the effects of his ambient environment upon the dress' thermal resistance. The mathematical model performs a numerical analysis on discrete composite layers comprised of the skin, dry protective suit, breathing gas mixture, and the surrounding ... |
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| The Development of Predictive Engineering Formulations for Diver Heating. Volume 2 |
1982 |
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| Authors:
Charles E. Johnson; James D. Collins; DUKE UNIV MEDICAL CENTER DURHAM N C F G HALL LAB FOR ENVIRONMENTAL RESEARCH
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| Contents: Appendix A -- Organization of the Direct Access Experimental Data Files; Appendix B -- Composite Data File Listings for Files RHL1AR1, DTP1ART, DTP2AR1, and DTP3AR1; Appendix C -- Determination of the Viscosity (mu), Thermal Conductivity (k), and Other Properties for A 95% Helium - 5% Oxygen Gas Mixture; Appendix D -- Interactive Program Documentation; Appendix E -- Interactive Program Flow Chart; Appendix F -- Interactive Program Listing; Appendix G ... |
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