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Showing 1 to 20 of 71 for “"SF6"”.
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Laser studies of relaxation processes in SF6.
Massachusetts Institute of Technology. Dept. of Chemistry. Thesis. 1971. Ph.D.
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Impulse breakdown characteristics of SF6 and its mixtures in highly non-uniform field gaps
… on positive impulse breakdown characteristics of SF6 and its mixtures in highly nonuniform field gaps has become an increasingly important subject on the gaseous dielectrics with high electric strength in high voltage apparatus. The main purpose of the present work is to acquire a better …
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Optimization of Reactive Ion Etching to Fabricate Silicon Nitride Stencil Masks in SF6 Plasma
Stencil masks are used to print ultra-high resolution patterns using helium ion/atom beam lithography and are often manufactured from thin, free-standing silicon nitride membranes. The masks have sub-200nm openings etched through the thickness of the membrane using a reactive ion etch (RIE) process …
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Analysis of a laser induced plasma in high pressure SF6 gas for high-voltage, high-current switching
… used to analyze a laser induced plasma spark in SF6 gas in order to quantify parameters such as spark length and plasma temperature. The laser spark is created through a focusing lens by the fourth-harmonic (266nm) of a 5ns FWHM pulsed Nd:YAG laser with 30mJ maximum energy output. Several …
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Investigation of the ability of RELAP5/MOD3 to model natural circulation of high pressure SF6 in the Westinghouse 1/7 scale PWR experimental facility
Thesis: M.S., Massachusetts Institute of Technology, Department of Nuclear Engineering, 1992
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CHARACTERIZATION OF BCl₃, SF₆, and BCl₃/SF₆ PLASMAS USING LANGMUIR PROBE MEASUREMENTS
A Langmuir probe study in BCl3, SF6, and mixtures of BCl3/SF6 capacitively-coupled plasmas is presented. In this study, energy distribution functions, electron temperatures (and average electron energy) and electron, positive ion, and negative ion densities were determined as a function of process …
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Tracerstudie zur Quantifizierung des Vertikaltransports in meromiktischen Seen
… wurde die Ausbreitung künstlich eingebrachter SF6-Tracerverteilungen und die Entwicklung der Temperatur- und Salzgehaltsprofile über mehrere Jahre beobachtet. Den Betrachtungen wurde zugrunde gelegt, dass die effektive Mischung analog zur Fick'schen Diffusion beschreibbar ist. Mit der …
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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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Calculation of pressure rise in electrical installations due to internal arcs considering SF 6-air mixtures and arc energy absorbers
… methods is limited. This is especially true if SF6-air mixtures have to be considered (SF6-insulated switchgear) or if arc energy absorbers are installed. In this thesis, both effects, which are important for pressure rise in the case of internal arcing, are treated. The key point of modelling …
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Widerstandsverteilung in Schaltlichtbögen von Selbstblasleistungsschaltern während der Stromnulldurchgangsphase
SF6 self-blast circuit breakers are widely used as switching elements in electrical power systems. In case of a short-circuit fault the breaker contacts are separated leading to an ignition of an electric arc. Hence, the current flow is carried by the electric arc itself. Due to a cooling of the …
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Kernspinrelaxation von Formaldehyd an Oberflächen und in der Gasphase
… von H2CO in Mischungen mit H2 bzw. SF6 bei kurzen Stoßzeiten (hohen Drücken) gemessen und mit den Vorhersagen der Theorie der Spin-Rotationswechselwirkung [Kasper et al., 1967; Chapovsky, 2001] verglichen. Um die Messwerte beschreiben zu können, muss der theoretisch vorhergesagte …
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Catalytic Decomposition of a Perfluorinated Carbon Proxy Using Alumina-based Catalysts
… catalysts were then tested to decompose SF6 using a custom-made rig. SF6 was used as a proxy to PFC’s as both produce a key decomposition product (HF) and are completely fluorinated (which leads to both being inert and potent as greenhouse gases). Therefore, the performance of the …
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Quantifying emissions of greenhouse gases from South Asia through a targeted measurement campaign
… ), nitrous oxide (N20) and sulfur hexafluoride (SF6) are powerful greenhouse gases with global budgets that are well-known but regional distributions that are not adequately constrained for the purposes of mitigation and policy initiatives. Quantifying emissions using inverse approaches at the …
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Spurenstoffuntersuchungen zur Tiefenwasserbildung und Zirkulation im Europäischen Nordmeer
Tritium/Helium, O18, SF6 und Freon Messungen aus dem Europäischen Nordmeer werden in dieser Arbeit für die Prozessstudie eines Schelfwasserabflusses sowie zur Bestimmung der Tiefenwassererneuerung und -zirkulation in der Grönlandsee benutzt. Die Prozessstudie zeigt, dass eine kombinierte …
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A detailed justification for the selection of a novel mine tracer gas and development of protocols for GC-ECD analysis of SPME sampling in static and turbulent conditions for assessment of underground mine ventilation systems
… industry standard tracer, sulfur hexafluoride (SF6). Novel tracer gases that have been successfully implemented in the past called for complex analysis methods requiring special equipment, or were designed for inactive workings. Experimentation with perfluoromethylcyclohexane (PMCH) and SF6 …
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Characterisation and analysis of a corona-stabilised switch filled with environmentally-friendly gas mixtures
… of finding an alternative switching medium to SF6 due to environmental concerns. For this purpose, a testing procedure was designed in order to test a novel gas in pulsed power, HFO-1234ze, in mixtures with N2, used as a buffer gas. Thus, decreasing the global warming potential (GWP) of the …
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Design of a high-affinity carbohydrate binding protein
… wurde ein tailspike protein des Bakteriophagen Sf6 verwendet (Sf6 TSP), das spezifisch an das O-Antigen von Shigella flexneri Y bindet. Eine inaktive Variante des Sf6 TSP wurde verwendet um einen hoch-affin bindenden Sensor für pathogene Shigella zu entwickeln. Der Shigella-Sensor wurde durch …
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Electrochemical conversion of a fluorinated greenhouse gas using a lithium battery configuration
… The electrochemical reaction between Li and SF6 in two different battery solvents has been characterized with a suite of solid and liquid phase analyses, which showed the reaction to be an 8 - electron transfer process with high Coulombic efficiency. Rotating disk electrode studies were also …
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Einfluss des Elektrodenabbrandes auf das Schaltverhalten eines SF 6-Selbstblasschalters
… breakers is to quench this electrical arc. In SF6 self blast circuit breakers, which present the newest generation of high voltage circuit breakers, the arc burns within the insulating nozzles. The high temperature of the arc leads to an ablation of the nozzle material and to a resulting gas …
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Multi-tracer Study for Groundwater Dating in Southern Oman
… were applied, i.e. noble gases, 14C, CFCs and SF6. While radiogenic 4He served as an initial qualitative dating approach, 14C tracer ages were calculated and corrected yielding mean residence times of up to 7000 years. In contrast, tracer ages derived from CFCs and SF6 data ranged from 20 to 50 …
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