منابع مشابه
Effects of helium and 40% O2 on graded exercise with self-contained breathing apparatus.
Maximal exercise performance is decreased when breathing from a self-contained breathing apparatus (SCBA), owing to a ventilatory limitation imposed by the increased expiratory resistance. To test the hypothesis that decreasing the density of the breathing gas would improve maximal exercise performance, we studied 15 men during four graded exercise tests with the SCBA. Participants breathed a d...
متن کاملEffects of self-contained breathing apparatus on ventricular function during strenuous exercise.
The purpose of this study was to investigate left-ventricular function during strenuous exercise with the self-contained breathing apparatus (SCBA). With the use of two-dimensional echocardiography, images of the left ventricle (LV) were acquired during sustained exercise (3 x 10 min) under two conditions: 1) SCBA, or 2) low resistance breathing valve. Twenty healthy men volunteered for the stu...
متن کاملQuantitatively Measuring In situ Flows using a Self-Contained Underwater Velocimetry Apparatus (SCUVA)
The ability to directly measure velocity fields in a fluid environment is necessary to provide empirical data for studies in fields as diverse as oceanography, ecology, biology, and fluid mechanics. Field measurements introduce practical challenges such as environmental conditions, animal availability, and the need for field-compatible measurement techniques. To avoid these challenges, scientis...
متن کاملExperimental and modeling study of thermal exposure of a self-contained breathing apparatus (SCBA).
An experimental apparatus designed to study firefighter safety equipment exposed to a thermal environment was developed. The apparatus consisted of an elevated temperature flow loop with the ability to heat the air stream up to 200°C. The thermal and flow conditions at the test section were characterized using thermocouples and bi-directional probes. The safety equipment examined in this study ...
متن کاملSelf-contained CLI Assemblies
High-level programming languages and bytecode-based virtual execution environments have become popular in software development. Bytecode-based runtimes extend embedded system by techniques to improve safety, help portability and interoperability. The ECMA/ISO Common Language Infrastructure (CLI) specifies a bytecodebased execution environment (Common Language Runtime) and a comprehensive class ...
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ژورنال
عنوان ژورنال: Nature
سال: 1918
ISSN: 0028-0836,1476-4687
DOI: 10.1038/102205c0