Bibliographies thématiques / High O2 pressure

Littérature scientifique sur le sujet « High O2 pressure »

Auteur : Grafiati
Publié le 25 mai 2024

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Articles de revues sur le sujet "High O2 pressure"

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Azyazov, V. N., M. V. Zagidullin, V. D. Nikolaev, M. I. Svistun et N. A. Khvatov. « Transport of high-pressure O2(1Δ) ». Quantum Electronics 24, no 3 (31 mars 1994) : 229–32. http://dx.doi.org/10.1070/qe1994v024n03abeh000059.

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van Blankenstein, J. H., C. J. Slager, L. K. Soei, H. Boersma et P. D. Verdouw. « Effect of arterial blood pressure and ventilation gases on cardiac depression induced by coronary air embolism ». Journal of Applied Physiology 77, no 4 (1 octobre 1994) : 1896–902. http://dx.doi.org/10.1152/jappl.1994.77.4.1896.

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In this study the time course of cardiac depression after selective intracoronary injection of air bubbles was investigated in six anesthetized pigs (30 +/- 2 kg) with different mixtures of ventilation gases and different mean arterial blood pressures (MAP). Air bubbles of 150 microns diam were injected into the left anterior descending coronary artery (LADCA) in a volume of 2 microliters/kg body wt. In each animal an injection of air bubbles was applied during ventilation with N2-O2 and a MAP of 77 +/- 3 mmHg (N2-O2/low pressure) or 111 +/- 3 mmHg (N2-O2/high pressure) and during ventilation with pure O2 and a MAP of 77 +/- 3 mmHg (O2/low pressure) or 110 +/- 3 mmHg (O2/high pressure). Systemic hemodynamic variables such as left ventricular pressure, its peak first derivatives, and MAP changed < 10% after injection of air bubbles. During N2-O2/low pressure, systolic segment length shortening in the LADCA region (SS-LADCA) decreased from baseline and did not return to baseline within the 10 min after injection of air bubbles. During N2-O2/high pressure and O2/low pressure, SS-LADCA was decreased between 60 and 120 s, whereas for O2/high pressure this period was from 60 to 90 s. By calculating the time integral of the deviation from baseline of SS-LADCA, it could be demonstrated that the depression of regional myocardial function was less severe during O2/high pressure and O2/low pressure than during N2-O2/low pressure. We conclude that, when coronary air embolism occurs during hypertension and during ventilation with pure O2 instead of a normal N2-O2 mixture, the resulting depression of regional myocardial function is reduced.
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Levi, A., et D. Sasselov. « Partitioning of Atmospheric O2 into High-pressure Ice in Ocean Worlds ». Astrophysical Journal 926, no 1 (1 février 2022) : 72. http://dx.doi.org/10.3847/1538-4357/ac4500.

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Abstract Planets with a few percent water by mass may have a high-pressure ice mantle separating the rocky interior from both the ocean and atmosphere. Here we examine whether the partitioning of O2 into high-pressure ice can constrain the atmospheric abundance of O2 produced by water photolysis in the atmosphere. We find that the partition coefficient of dissolved O2 between high-pressure ice and liquid water is about unity. We show that the solubility of O2 in high-pressure water ice yields an upper value for the atmospheric abundance of O2 that depends on the ocean surface temperature. The atmospheric pressure of O2 has a maximum of approximately 3000 bars. The latter drops to a few hundred bars as the surface temperature of the ocean approaches supercritical conditions.
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Silva, S. M., R. C. Herner et R. M. Beaudry. « 407 Regulation of Carbon Flux as a Function of O2 and CO2 Atmospheres in Asparagus Tips ». HortScience 34, no 3 (juin 1999) : 514B—514. http://dx.doi.org/10.21273/hortsci.34.3.514b.

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The purpose of this work was to investigate the influence of O2 and CO2 partial pressures on glycolytic carbon flux, phosphorylated intermediates, phosphate, pyrophosphate, and phosporylated nucleotides in asparagus spears tips stores at 1 °C. The effects of CO2 (0, 5, 10, and 20 kPa) combined with O2 pressures ranging from 0.1 to 16 kPa (1% O2 = 1.013 kPa O2 at 1 atm) were investigated. Spears were enclosed within a low-density polyethylene (LDPE) package (for the 5-, 10-, and 20-kPa CO2 treatments) having a surface area of 462 cm2 and enclosed in 1.95-L glass jars. Low O2 enhanced the interconversion of phosphoenolpyruvate (PEP) to pyruvate (PYR) and F6P to F1,6P2 relative to high O2. When spears tips at 16 kPa O2 were compared to those at harvest, little change occurred in the adenylate or phosphate pools. PPi and ATP contents decreased as the O2 partial pressure declined below 16 kPa O2. In general, as CO2 increased, PPi and ATP decreased, while Pi, ADP, and AMP increased. The adenylate energy charge (AEC) declined with a decline in the O2 partial pressure, declining most rapidly below 2 kPa O2. Low O2 reduced AEC relative to high O2. Increasing CO2 partial pressure reduced AEC, an effect not evident at lower O2. The data suggest low O2 and elevated CO2 impair oxidative phosphorylation and induce nonsustaining carbon metabolism, which may limit asparagus spear survival under O2-deficient conditions.
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Yang, Ming, Veena M. Bhopale et Stephen R. Thom. « Separating the roles of nitrogen and oxygen in high pressure-induced blood-borne microparticle elevations, neutrophil activation, and vascular injury in mice ». Journal of Applied Physiology 119, no 3 (1 août 2015) : 219–22. http://dx.doi.org/10.1152/japplphysiol.00384.2015.

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An elevation in levels of circulating microparticles (MPs) due to high air pressure exposure and the associated inflammatory changes and vascular injury that occur with it may be due to oxidative stress. We hypothesized that these responses arise due to elevated partial pressures of N2 and not because of high-pressure O2. A comparison was made among high-pressure air, normoxic high-pressure N2, and high-pressure O2 in causing an elevation in circulating annexin V-positive MPs, neutrophil activation, and vascular injury by assessing the leakage of high-molecular-weight dextran in a murine model. After mice were exposed for 2 h to 790 kPa air, there were over 3-fold elevations in total circulating MPs as well as subgroups bearing Ly6G, CD41, Ter119, CD31, and CD142 surface proteins—evidence of neutrophil activation; platelet-neutrophil interaction; and vascular injury to brain, omentum, psoas, and skeletal muscles. Similar changes were found in mice exposed to high-pressure N2 using a gas mixture so that O2 partial pressure was the same as that of ambient air, whereas none of these changes occurred after exposures to 166 kPa O2, the same partial pressure that occurs during high-pressure air exposures. We conclude that N2 plays a central role in intra- and perivascular changes associated with exposure to high air pressure and that these responses appear to be a novel form of oxidative stress.
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Howland, R. J., et K. Newman. « A high-precision automatic closed-circuit respirometer for small animals ». Journal of Applied Physiology 58, no 3 (1 mars 1985) : 1031–33. http://dx.doi.org/10.1152/jappl.1985.58.3.1031.

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An automatic apparatus for the continuous measurement of O2 consumption of small laboratory animals is described. By use of a high-sensitivity pressure transducer with associated circuitry together with a peristaltic O2 delivery system, the closed respirometer chamber is maintained at atmospheric pressure +/- 0.5 mmH2O. O2 delivery is measured to within 0.25 ml by recording rotations of the peristaltic pump, following calibration by the withdrawal of a preset volume of air from the chamber. Static trials (with the chamber empty) indicate a high degree of reproducibility of data with the chamber pressure remaining at atmospheric pressure +/- 0.5 mmH2O as a result of the proportional, as opposed to fixed-volume, delivery of O2. Trials with mice and rats have likewise produced data with a high degree of reproducibility.
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Rostain, J. C., M. C. Gardette-Chauffour et R. Naquet. « Occurrence of high-pressure nervous syndrome at constant pressure during change of mixture ». Journal of Applied Physiology 63, no 5 (1 novembre 1987) : 1919–25. http://dx.doi.org/10.1152/jappl.1987.63.5.1919.

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Three professional divers have performed a dive to 450 msw. From 200 msw and during the first 64 h on the bottom, they breathed a H2-He-O2 mixture with 54–56% H2. At this time a switch was performed to a mixture with 30% H2, and 8 h later a second switch was performed to 0% H2. In the H2-He-O2 mixture the clinical symptoms of high-pressure nervous syndrome (HPNS) were not present and the electroencephalogram changes were slight. The switch of the mixture induced an isobaric HPNS of high intensity. Twenty-four hours later the HPNS decreased, but the clinical symptoms persisted throughout the stay in the He-O2 mixture. The appearance of isobaric HPNS during the switch might be due to the disappearance of the narcotic substance which suppressed or masked the clinical symptoms; it might also be due to the sudden increase in the partial pressure of He, which was equivalent to a fast compression.
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Loubeyre, Paul, et René LeToullec. « Stability of O2/H2 mixtures at high pressure ». Nature 378, no 6552 (novembre 1995) : 44–46. http://dx.doi.org/10.1038/378044a0.

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Mills, S. J., et F. Nestola. « Elasticity and high-pressure structure of arsenoflorencite-(La) : insights into the high-pressure behaviour of the alunite supergroup ». Mineralogical Magazine 76, no 4 (août 2012) : 975–85. http://dx.doi.org/10.1180/minmag.2012.076.4.13.

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AbstractArsenoflorencite-(La), ideally LaAl3(AsO4)2(OH)6, was studied at high pressure by single-crystal X-ray diffractometry. The unit cell was determined at nine pressures up to 7.471(8) GPa; no evidence of a phase transformation was found in this range. The pressure volume data (refined simultaneously) were fitted to a third-order Birch Murnaghan equation of state which gave V0 = 710.71(8) Å3, KT0 = 106(2) GPa and K' = 9.2(9). These values were confirmed independently from an FE–fE plot. The crystal structure was refined at 1.596, 3.622, 5.749 and 7.471 GPa, the first time this has been done for a member the alunite supergroup. The compressibility of arsenoflorencite-(La) is strongly anisotropic, with βc > βa. The main compression mechanism was found to be governed by the internal angle O3 La O2 of the La polyhedron, where the O2 and O3 atoms move toward the c axis during compression.
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Lundegaard, Lars F., Christophe Guillaume, Malcolm I. McMahon, Eugene Gregoryanz et Marco Merlini. « On the structure of high-pressure high-temperature η-O2 ». Journal of Chemical Physics 130, no 16 (28 avril 2009) : 164516. http://dx.doi.org/10.1063/1.3118970.

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Thèses sur le sujet "High O2 pressure"

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Masquelet, Matthieu Marc. « Large-eddy simulations of high-pressure shear coaxial flows relevant for H2/O2 rocket engines ». Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47522.

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The understanding and prediction of transient phenomena inside Liquid Rocket Engines (LREs) have been very difficult because of the many challenges posed by the conditions inside the combustion chamber. This is especially true for injectors involving liquid oxygen LOX and gaseous hydrogen GH₂. A wide range of length scales needs to be captured from high-pressure flame thicknesses of a few microns to the length of the chamber of the order of a meter. A wide range of time scales needs to be captured, again from the very small timescales involved in hydrogen chemistry to low-frequency longitudinal acoustics in the chamber. A wide range of densities needs to be captured, from the cryogenic liquid oxygen to the very hot and light combustion products. A wide range of flow speeds needs to be captured, from the incompressible liquid oxygen jet to the supersonic nozzle. Whether one desires to study these issues numerically or experimentally, they combine to make simulations and measurements very difficult whereas reliable and accurate data are required to understand the complex physics at stake. This thesis focuses on the numerical simulations of flows relevant to LRE applications using Large Eddy Simulations (LES). It identifies the required features to tackle such complex flows, implements and develops state-of-the-art solutions and apply them to a variety of increasingly difficult problems. More precisely, a multi-species real gas framework is developed inside a conservative, compressible solver that uses a state-of-the-art hybrid scheme to capture at the same time the large density gradients and the turbulent structures that can be found in a high-pressure liquid rocket engine. Particular care is applied to the implementation of the real gas framework with detailed derivations of thermodynamic properties, a modular implementation of select equations of state in the solver. and a new efficient iterative method. Several verification cases are performed to evaluate this implementation and the conservative properties of the solver. It is then validated against laboratory-scaled flows relevant to rocket engines, from a gas-gas reacting injector to a liquid-gas injector under non-reacting and reacting conditions. All the injectors considered contain a single shear coaxial element and the reacting cases only deal with H₂-O₂ systems. A gaseous oyxgen-gaseous hydrogen (GOX-GH₂) shear coaxial injector, typical of a staged combustion engine, is first investigated. Available experimental data is limited to the wall heat flux but extensive comparisons are conducted between three-dimensional and axisymmetric solutions generated by this solver as well as by other state-of-the-art solvers through a NASA validation campaign. It is found that the unsteady and three-dimensional character of LES is critical in capturing physical flow features, even on a relatively coarse grid and using a 7-step mechanism instead of a 21-step mechanism. The predictions of the wall heat flux, the only available data, are not very good and highlight the importance of grid resolution and near-wall models for LES. To perform more quantitative comparisons, a new experimental setup is investigated under both non-reacting and reacting conditions. The main difference with the previous setup, and in fact with most of the other laboratory rigs from the literature, is the presence of a strong co-flow to mimic the surrounding flow of other injecting elements. For the non-reacting case, agreement with the experimental high-speed visualization is very good, both qualitatively and quantitatively but for the reacting case, only poor agreement is obtained, with the numerical flame significantly shorter than the observed one. In both cases, the role of the co-flow and inlet conditions are investigated and highlighted. A validated LES solver should be able to go beyond some experimental constraints and help define the next direction of investigation. For the non-reacting case, a new scaling law is suggested after a review of the existing literature and a new numerical experiment agrees with the prediction of this scaling law. A slightly modified version of this non-reacting setup is also used to investigate and validate the Linear-Eddy Model (LEM), an advanced sub-grid closure model, in real gas flows for the first time. Finally, the structure of the trans-critical flame observed in the reacting case hints at the need for such more advanced turbulent combustion model for this class of flow.
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Dahab, Hassan-Dahab. « Synthèse, cristallochimie et propriétés physiques de nickelates de terre rare (La, Nd) de structure dérivée de la perovskite à degré d’oxydation inusuel ». Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0047.

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Ces travaux qui s’inscrivent dans le cadre d’une collaboration entre l’ICMCB et l’institut Néel portent sur les nickelates (RE1-xSrxNiO2 ou RE = La et Nd) sous forme de poudres. Dans le cadre de cette thèse je présente la synthèse et design chimique de ces nouveaux matériaux par voie chimique innovante, incluant la chimie douce (voie citrate – nitrate), la synthèse sous haute pression d’oxygène (PO2 < 650 bars) (phases RENiO3) à haute température (T = 900°C) et enfin la réduction topochimique utilisant l’hydrure de calcium CaH2 à basse température (T<300°C), dans le but de stabiliser le Ni(+I) dans un environnement plan carré (RENiO2). La caractérisation physico-chimique des composés synthétisés, via les rayons X et de la microscopie électronique couplée à une sonde EDX a mis en évidence une limitation intrinsèque de la solubilité du Sr. Ensuite, nous avons étudié les propriétés physiques intrinsèques des matériaux synthétisés, par différentes techniques de laboratoire, telles que des mesures de transport électrique, de chaleur spécifique et de susceptibilité magnétique, mais aussi des mesures complémentaires qui font appel aux grands instruments : DRX sous pression physique (ESRF), diffusion élastique et inélastique de neutrons (ILL, ISIS, étude des excitations et ordre magnétique). Nous avons établi le schéma de champ cristallin et la possible présence d’un ordre magnétique intrinsèque à NdNiO2 et Nd1-xSrxNiO2. Enfin de nouvelles phases de type RENiO2.5 ont été stabilisées. Une structure cristalline originale qui stabilise trois états de valence du nickel a été proposée pour le composé NdNiO2.5. Ce dernier présente un ordre ferrimagnétique autour de 270 K
This work, which is part of a collaboration between the ICMCB and the Néel Institute, focuses on nickelates (RE1-xSrxNiO2 or RE = La and Nd) in the form of powder (bulk samples). Within this thesis, I present the synthesis and chemical design of these new materials using an innovative chemical route, including soft chemistry (citrate – nitrate route), synthesis under high oxygen pressure (PO2 < 650 bars) (RENiO3 phases) at high temperature (T = 900°C) and finally topochemical reduction using calcium hydride CaH2 at low temperature (T<300°C), with the aim of stabilizing Ni(+I) in a square planar environment (RENiO2). The physicochemical characterization of the as-synthetized compounds via laboratory X-ray diffraction and electron microscopy coupled to an EDX probe evidenced an intrinsic solubility limit of the Sr atoms. We then studied the intrinsic physical properties of the synthesized materials, not only by different laboratory techniques, such as electrical transport measurements, specific heat and magnetic susceptibility, but also using complementary measurements in large scale facilities instruments: XRD under physical pressure at the ESRF, elastic and inelastic neutron diffraction at the ILL and at ISIS for the study of magnetic excitations and magnetic order. We have established the crystal field diagram and the possible presence of an intrinsic magnetic order in NdNiO2 and Nd1-xSrxNiO2. Finally, new phases of the RENiO2.5 type have been synthetized. An original crystal structure that stabilizes three valence states of nickel has been proposed for the compound NdNiO2.5. The latter presents a ferrimagnetic order around 270 K
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Hahn, Jörg. « Untersuchung der Reaktion von Wasserstoffatomen mit Sauerstoffmolekülen (H+O2+M → HO2+M) in weiten Druck- und Temperaturbereichen ». Doctoral thesis, 2004. http://hdl.handle.net/11858/00-1735-0000-0006-AD4E-D.

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Livres sur le sujet "High O2 pressure"

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F, Morea S., Wu S. T. 1933- et United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, dir. Advanced high pressure O2/H2 technology. [Washington, DC] : National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1985.

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Hendrickx, Jan F. A., André van Zundert et Andre De Wolf. Inhaled anaesthetics. Sous la direction de Michel M. R. F. Struys. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199642045.003.0014.

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Inhaled anaesthetic drugs are administered via the lungs to provide ‘general anaesthesia’. They are considered complete anaesthetics because they in and by themselves can in most patients ensure all clinical end-points that are required for ‘general anaesthesia’ (unconsciousness, immobility, and haemodynamic stability). The dose–response curve of each clinical end-point is conveniently defined by its mid-point, the end-expired concentration Fa that ensures response suppression in 50 % of the patients (MACawake, MAC, and MACBAR). By understanding the dose–response curves and the factors that influence them (pharmacodynamics), the target Fa and the dose of other drugs can be selected in each individual patient. This target Fa is achieved by adjusting the carrier fresh gas flow (O2, air, N2O) and agent vaporizer setting Fd. ‘Pharmacokinetics’ is the study of the factors that affect the partial pressure cascade from the vaporizer down to the site of action. Because IADs are transported down a partial pressure gradient, Fa will always try to approach the inspired concentration Fi, a process that is described by the Fa/Fi ratio over time. Both Fa and Fi are routinely measured. N2O remains widely used, with scientific scrutiny rather than belief finally delineating its advantages and disadvantages. Xenon, the near-ideal agent, is discussed briefly because it may enter clinical practice despite its cost because of its potential advantages in a yet to be defined subgroup of high-risk patients. The carrier gas N2 is often overlooked, but deserves careful analysis to help the reader understand how rebreathing affects its kinetics in a circle breathing system.
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Chapitres de livres sur le sujet "High O2 pressure"

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Stocchetti, Nino, A. Chieregato, M. Marchi, M. Croci, R. Benti et N. Grimoldi. « High Cerebral Perfusion Pressure Improves Low Values of Local Brain Tissue O2 Tension (PtiO2) in Focal Lesions ». Dans Intracranial Pressure and Neuromonitoring in Brain Injury, 162–65. Vienna : Springer Vienna, 1998. http://dx.doi.org/10.1007/978-3-7091-6475-4_47.

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Del Gallo, Maddalena, Loretta Gratani et Giorgio Morpurgo. « Selection at the Chemostat of Azospirillum brasilense Cd N2-Fixing at High O2 Pressure ». Dans Azospirillum IV, 75–82. Berlin, Heidelberg : Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73072-6_10.

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Seino, Hiroshi, Kozo Ishizaki et Masasuke Takata. « High Total and High Oxygen Partial Pressure Effects on Bi-Sr-Ca-Cu-O Superconductor During O2-HIP Sintering ». Dans Advances in Superconductivity II, 177–80. Tokyo : Springer Japan, 1990. http://dx.doi.org/10.1007/978-4-431-68117-5_37.

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Hlastala, Michael P., et Albert J. Berger. « Blood Gas Transport and Tissue Gas Exchange ». Dans Physiology of Respiration, 96–113. Oxford University PressNew York, NY, 2001. http://dx.doi.org/10.1093/oso/9780195138467.003.0006.

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Abstract Storage and transport of 02 and CO2 in blood are accomplished by special mechanisms. Hemoglobin is instrumental to the storage of both O2 and CO2 in a way that is interactive, a feature that enhances the exchange of each gas and provides a reserve when 02 demand increases. Like inert gases, 02 dissolves in blood in direct proportion to its partial pressure. This relationship is described by Henry’s law: The proportionality constant relating 02 content (C0,) to 02 partial pressure (P02) isb02, the blood solubility coefficient, commonly expressed as ml gas (STPD) dissolved in 100 ml (1 dl) blood for every mm Hg of partial pressure. The value of bb differs for each gas (02 and CO2) and varies with temperature. More gas dissolves in liquid as temperature decreases. For blood at 37°C,b02 is approximately equal to 0.003 ml · dl-1 • mm Hg-1• This low solubility allows only a small portion of 02 to be dissolved in blood at physiological partial pressures (80 to 100 mm Hg). At a normal arterial P02 of 100 mm Hg, only 0.3 ml 02 can be stored as dissolved gas in each dl of blood. This does not, however, meet normal metabolic demands. This requirement is met by hemoglobin with its high O2 storage capability.
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Piantadosi, Claude A. « Climbing Higher ». Dans The Biology of Human Survival, 164–80. Oxford University PressNew York, NY, 2003. http://dx.doi.org/10.1093/oso/9780195165012.003.0015.

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Abstract Most of the world’s population lives at or near sea level, where their ancestors lived for thousands of generations. Because the human body is adapted to life at sea level, it must make physiological adjustments to the decrease in atmospheric pressure at higher altitudes. These adjustments are true physiological adaptations that appear to have evolved out of the survival advantage that tolerance to O2 deprivation affords the body. The amount of O2 in the atmosphere declines as altitude increases, exposing the body to hypoxia, which produces the same effects as certain disorders of cardiopulmonary function. At sea level the air column above Earth exerts a force approximately equivalent to the weight of a column of mercury (Hg) 760 millimeters (29.9 inches) high. This height of mercury, placed in a barometer, exactly counterbalances the normal sea level pressure of Earth, 1 ATA, or 1 bar (1000 millibars). On ascent to altitude barometric pressure falls because the atmosphere is less dense owing to the lower weight of the air column above it. Atmospheric pressure falls more rapidly at attitude than might be predicted from the weight of the air column because as one ascends there is less compression of the air from the gas above it.
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Epstein, Irving R., et John A. Pojman. « Apparatus ». Dans An Introduction to Nonlinear Chemical Dynamics. Oxford University Press, 1998. http://dx.doi.org/10.1093/oso/9780195096705.003.0008.

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In the previous chapter, we developed a set of conceptual and mathematical tools for analyzing the models and experimental data that form the subject matter of nonlinear chemical dynamics. Here, we describe some of the key items of experimental apparatus used to obtain these data so that the reader can better appreciate the results discussed in the following chapters and can learn how to begin his or her own investigations. The first several sections are devoted to measurements of temporal behavior, with emphasis on the techniques used to monitor reactions in time and on the reactors in which these reactions are studied. The final section focuses on the study of spatial patterns and waves in chemical systems. It is possible, by methods that we shall discuss later, to reconstruct the qualitative dynamics of a system from the measurement of only a single variable. However, the more species whose concentrations can be measured, the easier it is to elucidate a mechanism and the more rigorously that mechanism can be tested. The most impressive study of multiple species in a chemical oscillator was carried out by Vidal et al. (1980), who were able, by a combination of techniques, to monitor the concentrations of Ce4 + , Ce3+ , Br2, Br-, bromomalonic acid, O2, and CO2 in the BZ reaction. In the following sections, we will look at the most widely employed techniques: spectroscopic and potentiometric methods. In principle, and occasionally in practice, essentially any technique that can be used to detect changes in concentration can be utilized to monitor the systems that we are interested in. Approaches that have been employed to date include polarography, high-pressure liquid chromatography, and calorimetry. If there are absorbing species, ultraviolet and/or visible (UV/vis) spectroscopy offers rapid response time and high sensitivity for monitoring concentrations, particularly if the species of interest have spectra with relatively little overlap. Measurements can be made in a cuvette placed in a standard UV/vis spectrophotometer, but this configuration has several limitations.
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Actes de conférences sur le sujet "High O2 pressure"

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Babaeva, Natalia Yu, Mark J. Kushner et Ramesh A. Arakoni. « O2(1Δ) production in high pressure flowing He/O2 plasmas : scaling and quenching ». Dans 2007 IEEE Pulsed Power Plasma Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/ppps.2007.4345523.

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Pellegrini, Rocco Carmine, Claudio Bruno et Eugenio Giacomazzi. « Kinetics Simulations of High Pressure CH4-O2 Mixtures ». Dans 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-5092.

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Petersen, E., D. Davidson, M. Roehrig et R. Hanson. « Shock-induced ignition of high-pressure H2-O2-Ar and CH4-O2-Ar mixtures ». Dans 31st Joint Propulsion Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-3113.

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Di Rosa, Michael, Kurt Klavuhn et Ronald Hanson. « LIF spectroscopy of NO and O2 in high-pressure flames ». Dans 34th Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-844.

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Burke, Michael, Yiguang Ju, Frederick Dryer, Marcos Chaos et Stephen Klippenstein. « Kinetic Modeling of the H2/O2 Reaction in High-Pressure Flames ». Dans 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-93.

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Schley, gemann, G, C.-AHagemann,, et V. Golovitchev. « Comparison of high pressure H2/O2 rocket model-engine reference simulations ». Dans 31st Joint Propulsion Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-2429.

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KRUELLE, G., W. MAYER et C. A. SCHLEY. « Recent advances in H2/O2 high pressure coaxial injector performance analysis ». Dans 26th Joint Propulsion Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1990. http://dx.doi.org/10.2514/6.1990-1959.

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Burke, Michael, Yiguang Ju et Frederick Dryer. « Negative Pressure Dependence of High Pressure Burning Rates of H2/O2 Flames at Lean Conditions ». Dans 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-776.

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Spalding, Martin, Herman Krier et R. Burton. « Chemical kinetics of boron combustion in high pressure Ar/F/O2 mixtures ». Dans 34th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-3823.

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Barmashenko, Boris D., et Salman Rosenwaks. « Modeling of high-pressure O2(1^) generators for chemical oxygen-iodine lasers ». Dans Ninth International Symposium on Gas Flow and Chemical Lasers, sous la direction de Costas Fotakis, Costas Kalpouzos et Theodore G. Papazoglou. SPIE, 1993. http://dx.doi.org/10.1117/12.144538.

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