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Showing 1 to 20 of 28 for “"Sulfur hexafluoride"”.
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Evaluation of sulfur hexafluoride as a mobile phase for supercritical fluid chromatography
… phases make it more important. In this work sulfur hexafluoride is evaluated as a mobile phase for supercritical fluid chromatography. The separation of a model aromatic hydrocarbon mixture using different packed columns and operational parameters with UV as a detector is presented. The …
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Measurements of the second hyperpolarizabilty of argon, methane, carbon tetrafluoride, and sulfur hexafluoride
… tetrafluoride (CF{dollar}\sb6{dollar}), and sulfur hexafluoride (SF{dollar}\sb6{dollar}) by means of the dc Kerr effect in the gas phase. Measurements were made over a range of densities and extrapolated to the zero density limit. The results obtained have an uncertainty of 1.7%, 1.1%, 0.8%, …
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Saturation Behavior of Sulfur Hexafluoride at High Pressure With High-Incident Laser Flux
Made available in DSpace on 2014-12-10T19:06:57Z (GMT). No. of bitstreams: 1 7219788.pdf: 2265668 bytes, checksum: 68e85171138218e33767ef10dd332863 (MD5) Previous issue date: 1972
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Nitrous oxide as a substitute for sulfur hexafluoride in the ANSI/ASHRAE 110 Method of hood performance evaluation
… for laboratory hood containment performance. Sulfur hexafluoride is specified as the gas most suitable for this test and is most commonly used. Sulfur hexafluoride use has potential negative environmental repercussions as it is a potent greenhouse gas with a global warming potential 22,800 …
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High Pressure Light Scattering Studies of Dense Fluids (Collision, Induced, Lineshape)
… collision induced light scattering in methane, sulfur hexafluoride and carbon dioxide.
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Optimization of Reactive Ion Etching to Fabricate Silicon Nitride Stencil Masks in SF6 Plasma
… This project deals with the optimization of a sulfur hexafluoride and oxygen RIE. In this process, 0.5µm thick silicon nitride membranes are coated with 20nm of copper (hard mask) and 200nm of poly (methyl methacrylate) (resist). The desired patterns are then formed in the resist by electron …
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Fluctuations, Phase Separation and Wetting Films near Liquid-Gas Critical Point
… near the critical point of two pure fluids (sulfur hexafluoride and carbon dioxide) using a defocused grid method. The specially designed cell containing the pure fluid was heated and, as a result, a low contrast line appeared on the wetting film that corresponded to a sharp change in the …
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Compressible flows of dense gases in boundary layers
… mean flows over flat plates. Flows of nitrogen, sulfur hexafluoride, and toluene over adiabatic walls are examined; in addition, flows of nitrogen over heated and cooled walls are studied. Results indicate a breakdown of the standard correlations for the recovery factor and the Nusselt number due …
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Analysis of Kelvin-Helmholtz Instabilities Developing from Oblique Shock Interaction with a Heavy Gas Column
… experiments, the gas column consists of pure sulfur hexafluoride infused with ~11% acetone gas by mass. A misalignment of the pressure and density gradients (from the shock wave) results in three-dimensional vorticity deposition on the gaseous interface. This is the main mechanism responsible …
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Electrochemical conversion of a fluorinated greenhouse gas using a lithium battery configuration
… to convert the most potent greenhouse gas, sulfur hexafluoride (SF 6), into benign solids Li2S and LiF under room temperature conditions at an electrode - electrolyte interface. Galvanostatic discharge demonstrated that the reaction between Li and SF 6 is capable of delivering modest cell …
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Oblique shock interactions with gas cylinder interfaces
… quiescent air to form the column. The first is sulfur hexafluoride (SF6) which generates the well-known Richtmyer-Meshkov Instability (RMI) when impulsively accelerated by a shock wave. This instability is formed due to the misalignment of the pressure and density gradients during the …
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Observation and Measurement of the Growth of the Primary Instabilities of the Richtmyer-Meshkov Instability and Observation of Secondary Instabilities
… of air interacting with a cylindrical column of sulfur hexafluoride saturated with acetone. The experimental study is performed at two Mach numbers, 1.7 and 2.1, both with a maximum variation of 10% of either Mach number. The measurements of the size of these features of interest were compared to …
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Planar and oblique shock wave interaction with a droplet seeded gas cylinder
… The heavy gas cylinder is produced by injecting sulfur hexafluoride pre-mixed with glycol vapor into the test section of a tiltable shock tube through a co-flowing nozzle, with the gravity-driven flow of the heavy gas stabilized by an annular flow of air in the downward direction. Droplets in the …
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Development and Evaluation of a Permeation Plug Release Vessel (PPRV) for the Release of Perfluoromethylcyclohexane (PMCH) in Underground Mine Tracer Gas Studies
The use of sulfur hexafluoride (SF6) as a tracer gas for analyzing underground mine ventilation systems has been practiced for over 30 years. As a result, the methods used to release, sample, and analyze SF6 are well accepted. Although improvements are still being made to enhance the analysis of …
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Molecular dynamics simulation of nanoporous graphene for selective gas separation
… on two different gas mixtures - a helium-sulfur hexafluoride mixture, for which the large difference in molecular size lends itself to a size-based separation approach, and a hydrogen-methane mixture, which is relevant to natural gas processing. Our simulations show that graphene membranes …
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A TEST METHODOLOGY FOR MEASURING GASEOUS CONTAMINANT TRANSFER IN ENERGY WHEELS
… The EATR values for carbon dioxide and sulfur hexafluoride were nearly equal, indicating that carbon dioxide does not transfer by adsorption/desorption. A proposed test method for determining the contribution of adsorption/desorption in gaseous contaminant transfer in energy wheels was …
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Predicting the Spatial Output Field of a Laser Beam in a Thermally Self-Induced Inhomogeneous Medium
… LACE microfabrication of borosilicate glass in a sulfur hexafluoride process gas with a 10.6 micron wavelength laser beam are given. These results show how the surface morphology of the glass wafer is changed by the inhomogeneous laser beam interaction with the process gas.
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Oblique shock interactions With perturbed density interfaces
… Two gases are considered. The first gas is sulfur hexafluoride (SF6), which generates the well known Richtmyer-Meshkov Instability (RMI) when accelerated by a shock wave. This instability is formed due to a mis-alignment of the pressure and density gradients during impulsive acceleration. …
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Age of air and the circulation of the stratosphere
… model. We apply the theory to satellite data of sulfur hexafluoride (SF6) and nitrous oxide to derive the first observationally-based estimates of the global meridional overturning circulation strength at all levels in the stratosphere. These two independent global satellite data products agree …
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Thermophony in real gases
… such as air, argon, helium, oxygen, nitrogen and sulfur hexafluoride. Unlike previous approaches, the presented model can be applied to different kinds of thermophones and various gases, taking into account the thermodynamic properties of thermophone materials and of adjacent gases, degrees of …
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