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Topic: Sulfurhexafluoride


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In the News (Sun 21 Jul 19)

  
  Aboveground tank leak detection system and method - Patent 5048324
The apparatus of claim 1, wherein said liquid phase tracer means is selected from the group consisting of halogenated methanes, halogenated ethanes, sulfurhexafluoride, perfluorodecalin, and perfluoro 1,3 dimethylcyclohexane.
The apparatus of claim 21, wherein said different and distinct volatile liquid phase tracer means is selected from the group consisting of halogenated methanes, halogenated ethanes, halogenated ethenes, sulfurhexafluoride, perfluorodecalin, and perfluoro 1,3 dimethylcyclohexane.
The tracer is preferably selected from the group consisting of fluorinated halocarbons, methanes, and ethanes having a boiling point in the liquid phase in the range of about -72.degree.
www.freepatentsonline.com /5048324.html   (6640 words)

  
 Surge voltage arrester arrangement - Patent 4029997   (Site not responding. Last check: 2007-10-22)
Apparatus as in claim 3 wherein said insulating gas is sulfurhexafluoride.
Typically, the insulating gas used will be sulfurhexafluoride SF.sub.6 although other gases which form negative ions may also be used.
In contrast thereto, the spark gap arrays 40 to 43 of the present invention are installed within a container 73 indicated in dot-dash lines on the Figure and which is filled with an insulating gas.
www.freepatentsonline.com /4029997.html   (3727 words)

  
 [No title]   (Site not responding. Last check: 2007-10-22)
Low lying phonon states of the cluster and the interaction of these states with rovibrational states of a probe molecule will be treated by quantum Monte Carlo theory.
Computed quantities include lifetime broadening, shifts and splittings in infrared and Raman spectra of probe molecules such as sulfurhexafluoride or diatomic iodine.
By comparing theory with experimental measurements, the host-host and host-impurity couplings can be determined and used to study other energy dissipation processes in quantum fluids.
www.cs.utexas.edu /users/yguan/NSFAbstracts/Abstracts/MPS/CHE.MPS.a9318737.txt   (221 words)

  
 APStracts 2:0497A, 1995.   (Site not responding. Last check: 2007-10-22)
Anomalous behavior of helium and sulfurhexafluoride during single -breath tests in sustained microgravity.
We performed single breath wash-in tests for helium and sulfurhexafluoride in 4 subjects exposed to 14 days of microgravity ([mu]G) during the Spacelab flight SLS-2.
Subjects inspired a vital capacity breath of 5% He, 1.25% SF6,, remainder oxygen, and then exhaled to residual volume at 0.5 l/sec.
www.uth.tmc.edu /apstracts/1995/jap/November/497a.html   (285 words)

  
 Airport Lighting Relays
Reliable 2-pole high voltage relay developed for use for switching airport runway lighting with over 20 years of trouble-free use up to 2400V, 50/60Hz, 20 amp maximum interrupt, has been now upgraded to also handle up to 5000V 50/60Hz, 12 amps maximum interrupt.
Unit is air insulated, does not require vacuum, oil or sulfurhexafluoride insulation or a leak tight container.
Has a 100 AMP continuous capability, a peak 1 minute test of 30KV and operates with 115V or 230V 50/60Hz actuator.
www.rossengineeringcorp.com /airport_lighting_relays.htm   (81 words)

  
 diyAudio Forums Archive - What if you build a sub with helium in it?
The speed of sound in sulfurhexafluoride would be about half that of the speed of sound in air.
Sulfurhexafluoride is oderless and inflammable, so no problems there (could have found that out yourself btw).
Due to a quirk in the english language, there are many, both words flamable and inflamable mean that the substance will burn.
www.diyaudio.com /forums/showthread/t-65687.html   (3346 words)

  
 Anticipation Builds for Kyoto Finale
Carbon dioxide, methane and nitrous oxide would be regulated at the Kyoto meeting.
A separate target will be set for perfluorocarbons, hydrofluorocarbons and sulfurhexafluoride at future climate conferences.
Developed nations are still desperately seeking a tangible commitment from developing countries that will pass for "meaningful participation" and mollify the US Senate.
www.globalwarming.org /article.php?uid=318   (863 words)

  
 ToothWoman.net
Nitrous Oxide can be a great way to make dental visits more comfortable but if you’ve had recent ophthalmic surgery, there could be serious adverse interactions.
Perfluoropropane and Sulfurhexafluoride are used in ophthalmic surgery, and a normal part of their use, is the development of a “gas bubble” in the eye.
The bubble with perfluoropropane can last for 8 weeks, and the bubble with Sulfurhexafluoride for 2 weeks.
www.toothwoman.net /news/june02.htm   (748 words)

  
 January 5, 2002
Craig Hunter will be mixing up 19,000 liter tanks of iron sulfate and mixing it with sulfurhexafluoride (an inert chemical tracer).
The relatively large amounts of iron (several tons) will be mixed with tiny amounts of tracer (a few hundred grams) and both will be diluted to vanishingly small quantities such that their very detection will comprise a major analytical challenge.
The presence of both sulfurhexafluoride and helium-3 will enable Kevin and Rikk to measure gas exchange and mixing in the surface waters.
www.mbari.org /expeditions/SOFeX2002/January5.htm   (1222 words)

  
 Environmental Research at LDEO
In September of 1993, Lamont-Doherty's Geochemistry group requested support for research development activities aimed at broadening the Institute's environmental agenda.
FY 1994: The project team designed and constructed a new gas chromatographic system for measurement of sulfurhexafluoride (SF-6) and tested it in a pilot study on the Hudson River.
The system allows the labeling of certain water parcels (e.g., waste water outlets) in rivers and estuaries and tracing their spread over periods of several weeks.
www.columbia.edu /cu/ord/FY97/GlobalSystemsInitiative/GSIERaLDEO.html   (699 words)

  
 Welcome To Home Energy Magazine Online
In addition to numerous indoor and two outside temperature sensors, the testing protocol required global horizontal and principal glazing orientation solar radiation, whole-building power consumption and power consumption outside the building envelope, and relative humidity.
We performed blower door tests to determine changes in effective leakage area resulting from superwindow installation, and we measured infiltration directly by monitoring the dilution rate of sulfurhexafluoride tracer gas injected into the air within the houses.
The building load coefficient, effective heat capacitance, and solar heat gain were calculated from the data for each of the 20 houses both before and after superwindow installation.
homeenergy.org /archive/hem.dis.anl.gov/eehem/94/940910.html   (2559 words)

  
 IngentaConnect Cold-air ventilation and the nocturnal boundary layer structure a...
The ballast facet of a goods station with its railway track leading towards the rural surroundings of the city of Osnabrück, Germany, was studied in terms of its thermal behaviour and its significance as an urban ventilation path for nocturnal cold-air transport from the rural surroundings.
The investigations are based on sulfurhexafluoride (SF) tracer experiments, tethersonde soundings and energy-balance measurements.
Although the ballast facet absorbs much of the incoming solar radiation during the day it is able to cool significantly throughout the night.
www.ingentaconnect.com /content/schweiz/mz/2004/00000013/00000005/art00010   (365 words)

  
 ECI European Chemical Industries Ltd. - Emcepren 80IG   (Site not responding. Last check: 2007-10-22)
EMCEPREN 80 IG is a thermoplastic insulating glass sealant based on synthetic rubber.
is an exellent barrier against water vapour and gases such as Argon or Sulfurhexafluoride.
EMCEPREN 80 IG has good adhesion to all material used in the insulting glass industry, such as glass, aluminium, anodised surfaces or stainless steel.
www.ecilimited.com /emcepren80ig.htm   (244 words)

  
 Ideal Gases and the Kinetic Theory   (Site not responding. Last check: 2007-10-22)
The average kinetic energy is proportional to the temperature (in K) of the gas.
Note that the nature or kind of gas does not enter into these equations so the assumptions should be true whether we're talking about oxygen or sulfurhexafluoride.
Using these assumptions, Maxwell, Boltzmann, and Clausius developed mathematical models of the behavior of these gases.
neon.chem.uidaho.edu /~honors/ideal.html   (433 words)

  
 Diffusive gas transport through flooded rice systems
Plant parameters were estimated from published data and experiments independent of the validation experiment.
An independent experiment is described in which the diffusion coefficient of sulfurhexafluoride (SF
The model was validated by experiments in which transport of SF
www.agu.org /pubs/crossref/2001/2001JD900176.shtml   (365 words)

  
 Infrared Gas Imaging Techology products Sherlock harmful gases emissions
GIT develops and sells infrared gas imaging products (Sherlock®) that allow for the visualization and quantification of otherwise invisible and harmful gases that can cause both severe damage to the environment, and catastrophic explosions at oil, gas, chemical and power plants.
GIT’s technology can “see,” detect and quantify a range of gases, such as explosive volatile organic compounds, greenhouse gases such as carbon dioxide, methane and sulfurhexafluoride.
Quantification of greenhouse gases is crucial in light of increasingly rigid federal, state, local and international regulations including the Kyoto Treaty, The Gas Star Program and the Regional Greenhouse Gas Initiative.
gitint.com /index.htm   (170 words)

  
 Transcranial Duplex Imaging With a Sulfurhexafluoride Echocontrast Agent: Enhancement and Diagnostic Quality -- ...
Transcranial Duplex Imaging With a Sulfurhexafluoride Echocontrast Agent: Enhancement and Diagnostic Quality -- Schweikert et al.
Articles by Schweikert, K. Articles by Lyrer, P. Transcranial Duplex Imaging With a Sulfurhexafluoride Echocontrast Agent: Enhancement and Diagnostic Quality
CONTACT US Copyright © 2002 by American Society of Neuroimaging Privacy Policy
jon.sagepub.com /cgi/content/abstract/12/1/19   (201 words)

  
 EME - Your partner for energy and process optimization   (Site not responding. Last check: 2007-10-22)
EME - Your partner for energy and process optimization
HVS circuit breakers use sulfurhexafluoride SF6 for insulation and interruption.
They are used in installations with rated voltages up to 36 kV, rated currents up to 1250A and rated breaking capacities up to 25 kA.
www.eme.be /eng/productdetail.asp?productid=1536479949   (101 words)

  
 Energieliteratuur: Non-CO2 greenhouse gas emissions resulting from 4 selected products used by households in the ...   (Site not responding. Last check: 2007-10-22)
Non-CO2 greenhouse gas emissions resulting from 4 selected products used by households in the Netherlands
Non-CO2 greenhouse gases (GHGs) such as methane, CH4, nitrous oxide, N2O hydrofluorcarbons, HFCs, perfluorcarbons, PFCs and sulfurhexafluoride (SF6) can contribute significantly to the enhanced greenhouse effect'.
In a study executed by ECN and RIVM it was found that in the period 1990-1995 the contribution of non-CO2 GHGs to the total emission of GHGs in the Netherlands was about 25% 2.
www.energie.nl /nel/nl01e0572.html   (443 words)

  
 Solvay Polymer for Membranes - Filter Membrane Polymers - Ultra filtration - Microfiltration - Nanofiltration
The outcome of these together with other information is the body of the "green paper on PVC" issued in 2000
A basket of 6 gases, Carbondioxide (CO2), Methane (CH4), Dinitrogenoxide (N2O), HFCs, PFCs and Sulfurhexafluoride (SF6) which have a Global Warming Potential (GWP) and therefore have an impact on Climate Change
Fluorine containing hydrocarbons which have no negative impact on the ozone and are mainly used for refrigeration, air-conditioning and insulation applications; they have replaced ozone depleting chlorinated hydrocarbons
www.solvaymembranes.com /services/glossary/0,,445-2-0,00.htm   (2902 words)

  
 February 17, 2002
All values are tentative and as yet, uncalibrated but the relative magnitude of the properties should be correct and they indicate some very significant findings.
Over the last few days, we mapped the surface distribution of parameters, sniffing as we went using sulfurhexafluoride (SF6) as our guide.
Note fl dots indicate position that SF6 sample was taken.)
www.mbari.org /expeditions/SOFeX2002/february17.htm   (1630 words)

  
 PIER PROJECT FINAL REPORT - Publication # CEC-500-2005-121
Download Report in Acrobat PDF (94 pages, 602 kilobytes)
This report is the first to present information on the methane (CH4), hydrofluorcarbon (HFC), perfluorcarbon (PFC), and sulfurhexafluoride (SF6) abatement potential in California.
This study summarizes and customizes currently available information on the mitigation potential of a variety of options for reducing non-carbon dioxide (non-CO2) greenhouse gas (GHG) emissions in California.
www.energy.ca.gov /pier/final_project_reports/CEC-500-2005-121.html   (2177 words)

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