Results 271 to 280 of about 6,019,713 (343)

Breathing under high ambient pressure

Journal of Applied Physiology, 1966
Abstract : The acute effect of high ambient pressure on expiratory airflow was studied in healthy, adult males in the ambient pressure range from 1.0 to 7.0 atmospheres absolute pressure (Ata), using a hyperbaric chamber. Changes in flow were assessed with the maximum expiratory flow-volume curve.
G P, Lord, G F, Bond, K E, Schaefer
openaire   +2 more sources

Ambient pressure air/oxygen blender

Journal of Biomedical Engineering, 1992
This article presents a unique air/oxygen mixing device specifically designed for respiratory therapy applications where compressed air is not available. The need for such a device has increased drastically over recent years because of the increasing number of ventilator-dependent patients being cared for in private homes, which often lack facilities ...
D W, Guillaume, D, DeVries
openaire   +2 more sources

An ambient pressure, direct hydrogenation of ketones

Chemical Communications, 2023
We report two bifunctional (pyridyl)carbene-iridium(i) complexes that catalyze ketone and aldehyde hydrogenation at ambient pressure.
Long Zhang, Zhiyao Lu, Andrew R. Rander, Travis J. Williams   +3 more
openaire   +2 more sources

Ambient air, by near-ambient pressure XPS

Surface Science Spectra, 2019
Near-ambient pressure x-ray photoelectron spectroscopy (NAP-XPS) is a less traditional form of XPS that allows samples to be analyzed at relatively high pressures, i.e., at 2500 Pa or higher. With NAP-XPS, XPS can analyze moderately volatile liquids, biological samples, porous materials, and/or polymeric materials that outgas significantly.
Dhananjay I. Patel, Stephan Bahr, Paul Dietrich, Michael Meyer, Andreas Thißen, Matthew R. Linford   +5 more
openaire   +1 more source

Numerical investigation on the effect of ambient pressure on mechanical smoke extraction efficiency in tunnel fires

Fire safety journal, 2020
This paper has analyzed the ambient pressure on the effect of the efficiency of the mechanical smoke extraction system in tunnel fires. These were simulated by Large Eddy Simulation (LES) with Fire Dynamics Simulator (FDS).
Tiantian Tan, Longxing Yu, Long Ding, Zihe Gao, J. Ji   +4 more
semanticscholar   +1 more source

Influence of cycling aging and ambient pressure on the thermal safety features of lithium-ion battery

, 2020
The fire and explosion risks of lithium-ion batteries (LIBs) pose serious threat to the transport and application of LIBs on the aircraft. Therefore, the study of corresponding thermal safety problems in flight condition is of great importance.
Song Xie, Lixiang Ren, Xiaoyong Yang, Haibin Wang, Qiang Sun, Xiantao Chen, Yuanhua He   +6 more
semanticscholar   +1 more source

Atomic-scale electron microscopy at ambient pressure

Ultramicroscopy, 2008
We demonstrate a novel nanoreactor for performing atomic-resolution environmental transmission electron microscopy (ETEM) of nanostructured materials during exposure to gases at ambient pressures and elevated temperatures. The nanoreactor is a microelectromechanical system (MEMS) and is functionalized with a micrometer-sized gas-flow channel, electron ...
J F, Creemer, S, Helveg, G H, Hoveling, S, Ullmann, A M, Molenbroek, P M, Sarro, H W, Zandbergen   +6 more
openaire   +2 more sources

Ambient-pressure superconductivity onset above 40 K in (La,Pr)3Ni2O7 films

Nature
The discovery of Ruddlesden–Popper (RP) bilayer nickelate superconductors under high pressure has opened a new chapter in high-transition-temperature superconductivity1, 2, 3, 4, 5, 6, 7–8.
Guangdi Zhou, Wei Lv, Heng Wang, Zihao Nie, Yaqi Chen, Yueying Li, Haoliang Huang, Weiqiang Chen, Yujie Sun, Qi-Kun Xue, Zhuoyu Chen   +10 more
semanticscholar   +1 more source

Behavior of hydrogen hollow-cone spray depending on the ambient pressure

, 2020
Hydrogen as a fuel is feasible for future sustainable mobility. Because hydrogen has a low volumetric energy density, high-pressure hydrogen is required for high-speed fuel injection.
Sanguk Lee, Gyeonggon Kim, C. Bae
semanticscholar   +1 more source

Exercise ventilatory mechanics at increased ambient pressure

Journal of Applied Physiology, 1978
Transpulmonary pressure, lung volume, and flow rate were recorded in two healthy subjects performing graded exercise between 1 and 10 ATA. At simulated depths greater than 4 ATA, exercise was terminated by severe choking dyspnea at levels of work, oxygen consumption, heart rate, and ventilation significantly lower than during maximum exercise at 1 ATA.
L D, Wood, A C, Bryan
openaire   +2 more sources