نتایج جستجو برای: oxygen concentration
تعداد نتایج: 570259 فیلتر نتایج به سال:
Oxygen quantification in trace amounts is essential in many fields of science and technology. Optical oxygen sensors proved invaluable tools for oxygen measurements in a broad concentration range, but until now neither optical nor electrochemical oxygen sensors were able to quantify oxygen in the sub-nanomolar concentration range. Herein we present new optical oxygen-sensing materials with unma...
Introduction: Oxygen central is one of the vital parts of the hospital that is responsible for supplying oxygen. The occurrence of any defect can result in fatality and finansial damage. Therefore, effective risk analysis is very importance in preventing and mitigating such potential accidents.The purpose of this study was to analyze the scenarios of accidents in the oxygen central unit of the ...
BACKGROUND The effect on Paco2 of high concentration oxygen therapy when administered to patients with severe exacerbations of asthma is uncertain. METHODS 106 patients with severe exacerbations of asthma presenting to the Emergency Department were randomised to high concentration oxygen (8 l/min via medium concentration mask) or titrated oxygen (to achieve oxygen saturations between 93% and ...
The growth of yeast cells to high densities at low, but constant, oxygen concentrations is difficult because the cells themselves respire oxygen; hence, as cell mass increases, so does oxygen consumption. To circumvent this problem, we have designed a system consisting of a computer-controlled gas flow train that adjusts oxygen concentration in the gas flow to match cellular demand. It does thi...
Depth profiling of Oxygen in the surface of materials is important for many oxide elements. In this research two methods of ion beam analysis techniques were used for depth profiling of oxygen in nanoporous anodic Alumina by Nuclear Reaction Analysis (NRA) ( 16O(d, p1)17O ,16O(d, p0)17O) and resonant elastic scattering (RES)( 16O(α, α)16O). By using simulation software, variation of oxygen conc...
OBJECTIVE This prospective study aimed to characterize the changes in blood lactate concentration and blood oxygen saturation in patients during the immediate postoperative period of cardiac surgery with extracorporeal circulation. METHODS Blood samples were collected from 35 patients in a rapid and random order from the arterial line and from the proximal and distal port of a pulmonary arter...
Reply re: "the efficacy of a midfacial seal drape in reducing oculofacial surgical field fire risk".
PURPOSE To evaluate the efficacy of a midface seal drape in eliminating fire risk oxygen concentrations from nasal cannulated oxygen delivery compared with a standard open oculofacial surgical field. METHODS Controlled experiment using the SimMan patient simulator and an oxygen detector. Oxygen concentrations were measured at 9 facial surgical locations with nasal cannula flow rates of 2, 4, ...
Original scientific paper Laboratory tests were conducted to study coal spontaneous combustion at low-temperature (30 ÷ 200 °C) in the air of reduced oxygen (10 ÷ 21 %) and low methane concentrations (0 ÷ 3 %). The production of carbon monoxide in coal spontaneous combustion was analysed. The test results show that both oxygen and methane concentrations affect coal spontaneous combustion. At gi...
The effect of excess point defects on the equilibrium concentration interstitial oxygen for system oxygen/SiO2 precipitates in crystalline Si is theoretically investigated. expression modified by derived. Excess vacancies are found to decrease this concentration, while self-interstitials have opposite effect. effects different conditions defect generation studied.
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