Increased Arterial Potassium Levels May Contribute to the Drive to Breathe at Very High Altitude

1989 ◽  
pp. 191-200 ◽  
Author(s):  
David J. Paterson ◽  
Piers C. G. Nye
Keyword(s):  
High Altitude ◽  
Very High

scholarly journals Comparison Between Pressure Swing Adsorption and Liquid Oxygen Enrichment Techniques in the Atacama Large Millimeter/Submillimeter Array Facility at the Chajnantor Plateau (5,050 m)

2021 ◽  
Vol 12 ◽  
Author(s):  
Ivan Lopez ◽  
Reinaldo Aravena ◽  
Daniel Soza ◽  
Alicia Morales ◽  
Silvia Riquelme ◽  
...  
Keyword(s):  
High Altitude ◽  
Pressure Swing Adsorption ◽  
Large Scale ◽  
High Mobility ◽  
Oxygen Enrichment ◽  
Oxygen Availability ◽  
Liquid Oxygen ◽  
High Altitudes ◽  
Pressure Swing ◽  
Very High

The Chilean workforce has over 200,000 people that are intermittently exposed to altitudes over 4,000 m. In 2012, the Ministry of Health provided a technical guide for high-altitude workers that included a series of actions to mitigate the effects of hypoxia. Previous studies have shown the positive effect of oxygen enrichment at high altitudes. The Atacama Large Millimeter/submillimeter Array (ALMA) radiotelescope operates at 5,050 m [Array Operations Site (AOS)] and is the only place in the world where pressure swing adsorption (PSA) and liquid oxygen technologies have been installed at a large scale. These technologies reduce the equivalent altitude by increasing oxygen availability. This study aims to perform a retrospective comparison between the use of both technologies during operation in ALMA at 5,050 m. In each condition, variables such as oxygen (O2), temperature, and humidity were continuously recorded in each AOS rooms, and cardiorespiratory variables were registered. In addition, we compared portable O2 by using continuous or demand flow during outdoor activities at very high altitudes. The outcomes showed no differences between production procedures (PSA or liquid oxygen) in regulating oxygen availability at AOS facilities. As a result, big-scale installations have difficulties reaching the appropriate O2 concentration due to leaks in high mobility areas. In addition, the PSA plant requires adequacy and maintenance to operate at a very high altitude. A continuous flow of 2–3 l/min of portable O2 is recommended at 5,050 m.

scholarly journals SAFETY OF USE OF HIGH ALTITUDE PROTECTION SUITS FOR KINESITHERAPY – PRELIMINARY REPORT

2020 ◽  
Vol 25 (1) ◽  
pp. 50-54
Author(s):  
Maciej Abakumow ◽  
◽  
Krzysztof Kowalczuk ◽  
Keyword(s):  
Blood Pressure ◽  
Healthy Volunteers ◽  
High Altitude ◽  
Cardiovascular System ◽  
Preliminary Report ◽  
Pressure Increase ◽  
Blood Pressure Increase ◽  
Safety Considerations ◽  
Very High

Abstract: Apart from protection from very high altitude or influence of increased gravitational accelerations protective suits sometimes are used for another applications like supporting kinesitherapy. Because of some safety considerations connected with possible cardiovascular system overload and dangerous blood pressure increase we tested if these concerns are valid. Main aim ot presented research performed with participation of healthy volunteers was to confirm that use of High Altitude Protection (HAP) suit is safe in terms of increased cardiovascular.

scholarly journals A NEW COCCID FROM CALIFORNIA AT A VERY HIGH ALTITUDE

1902 ◽  
Vol 34 (8) ◽  
pp. 193-194
Author(s):  
Edw. M. Ehrhorn
Keyword(s):  
High Altitude ◽  
Entire Body ◽  
Salmon Pink ◽  
Anal Ring ◽  
Orange Colour ◽  
Very High

Exæretopus caricis, n. sp.Adult ♀ salmon pink, shiny, about 2 mm. long and 1 mm. broad, elongage oval. Legs and antennæ light brown. ♀ secretes a mass of cotton all over her body, becoming so dense as to completely envelope the entire body, looking more like and elongated Eriococcus. This secretion extends caudad, forming a large egg-sac, which, including the whole insect, measures from 4 to 5 mm. Eggs salmon pink. Yound larvæ orange colour. Adult ♀ after boiling in K.O.H.derm remains light brown. Margin beset with fine, short, straight spines, incisions having two stout curved spines. There are numerous short conical spines scatterd over the derm with irregular rows of long fine hairs. Anal plates large and thick, each with four shor, stout spines. Anal ring with six very long, stout hairs, which extend to caudal end of plates. Antennæ long, slender, tapering, 8-jonted. Joint 3 always longest and joint 7 always shortet, each joint with one or more fine hairs, joint 8 with several long hairs.

Analysis of climatic data and forecast indices for human fascioliasis at very high altitude

1999 ◽  
Vol 93 (8) ◽  
pp. 835-850 ◽  
Author(s):  
M. V. Fuentes ◽  
M. A. Valero ◽  
M. D. Bargues ◽  
J. G. Esteban ◽  
R. Angles ◽  
...  
Keyword(s):  
High Altitude ◽  
Climatic Data ◽  
Human Fascioliasis ◽  
Very High

Corneal Thickness Changes in Very-High-Altitude Mountaineers

2010 ◽  
Vol 128 (9) ◽  
pp. 1224-1225 ◽  
Author(s):  
T. H. Mader ◽  
L. J. White
Keyword(s):  
High Altitude ◽  
Corneal Thickness ◽  
Very High

Very high altitude tethered balloon feasibility study

1995 ◽  
Author(s):  
Anthony Euler ◽  
Surjit Badesha ◽  
Larry Schroeder
Keyword(s):  
High Altitude ◽  
Feasibility Study ◽  
Tethered Balloon ◽  
Very High

Very high altitude tethered balloon trajectory simulation

1996 ◽  
Author(s):  
Surjit Badesha ◽  
Anthony Euler ◽  
Larry Schroder
Keyword(s):  
High Altitude ◽  
Tethered Balloon ◽  
Trajectory Simulation ◽  
Very High

scholarly journals Thermosphere and exosphere of hot Jupiters

2008 ◽  
Vol 4 (S253) ◽  
pp. 281-287
Author(s):  
Alain Lecavelier des Etangs
Keyword(s):  
High Altitude ◽  
Theoretical Modeling ◽  
Giant Planets ◽  
Upper Atmosphere ◽  
Escape Rate ◽  
Energy Diagram ◽  
Lyman Alpha ◽  
Hot Jupiters ◽  
First Time ◽  
Very High

AbstractHere we describe the observations and the resulting constraints on the upper atmosphere (thermosphere and exosphere) of hot Jupiters. In particular, observations and theoretical modeling of hot-Jupiter evaporation are described. The observations allowed the discovery that the planet orbiting HD209458 has an extended atmosphere of escaping hydrogen and showed the presence of oxygen and carbon at very high altitude. These observations give unique constraints on the escape rate and mechanism in the atmosphere of these planets. The most recent Lyman-alpha HST observations of HD189733b allow for the first time to compare the evaporation from two different planets in different environments. We present models to quantify the escape rate from the measured occultation depths, and an energy diagram to describe the evaporation state of hot Jupiters. Using this diagram, it is shown that few already known planets could be remnants of former giant planets.

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