• Ultraviolet Spectral Analysis and Quantitative Detection of

    As an alternative to sulfur hexafluoride (SF 6 ) with great potential for application, heptafluoroisobutyronitrile-carbon dioxide (C 4 F 7 N-CO<sub2</sub) gas mixture has been applied in various gas-insulated equipment.

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  • Case report: Real-time contrast-enhanced ultrasonography for

    Real-time CEUS was conducted using sulfur hexafluoride (Sulfr hexafluoride; SonoVue) as a contrast agent, with a mean microbubble diameter of 2.5 mm of the phospholipid microcyst. Real-time CEUS demonstrated that the arterial, portal vein and prolonged phases were not enhanced in the focal zone of the liver (Fig. 1). The ultrasound detected several cystic

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  • Sulfur hexafluoride - Wikipedia

    Sulfur hexafluoride is also routinely used as a tracer gas in laboratory fume hood containment testing. The gas is used in the final stage of ASHRAE 110 fume hood qualification. A plume of gas is generated inside of the fume hood and a battery of tests are performed while a gas analyzer arranged outside of the hood samples for SF 6 to verify the containment properties of the fume hood.

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  • Delivery of TFPI-2 using ultrasound with a microbubble agent

    Author information: (1)Department of Biochemistry and Molecular Biology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. Here we report a new, simple and efficient method by using ultrasound and a microbubble agent (SonoVue) for delivering a gene to balloon-injured carotid arteries for restenosis prophylaxis.

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  • Halogen Gas Detector (insulating gas) from China Manufacturer

    Instrument Testing for qualitative analysis. Operators only need to open the 5750A-type sulfur hexafluoride leak detector switch, the leak will be programmed as soon as you can search a variety of gases. When the leak gas gets close to the tester, the alarm will response quickly, alarm speed and frequency increase with the increase of leakage.

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  • Macular hole surgery recovery with and without face-down

    Results: Five RCTs composed of a total of 183 eyes in the FDP group and 175 eyes in the nFDP group were included in this meta-analysis. Statistical meta-analysis revealed that the overall MH closure rate in the FDP group was significantly higher than that in the nFDP group (OR = 2.27, 95% CI: 1.02 to 5.05, P = 0.04).

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  • Thermodynamic modeling and analysis of an optical electric

    Mar 24, 2015 · 1. Sensors (Basel). 2015 Mar 24;15(4):7125-35. doi: 10.3390/s150407125. Thermodynamic modeling and analysis of an optical electric-field sensor.

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  • Is the end coming for sulfur hexafluoride, the most powerful

    Oct 15, 2020 · Paying for more environmentally friendly switchgear. According to respondents, a higher purchasing price is one of the main barriers for adoption of SF 6-free alternative.At the same time, survey participants were in principle willing to pay more for environmental-friendly switchgear options—on average up to 20% compared to their usual purchasing price.

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  • Synthesis and Dielectric Properties of

    Sulfur hexafluoride (gaz sf6) gas has been used in large-scale electrical equipment, because of its excellent high-voltage dielectric strength. However, sf 6 has been identified as a greenhouse gas, because of its high global warming potential (GWP) and extended lifetime in the atmosphere. Based on theoretical calculations, trifluoromethanesulfonyl fluoride (CF3SO2F) is a relatively eco-friendly

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  • EMISSION FACTORS DEVELOPED BASED ON PHASE VII TESTING

    perchlorate, and sulfur hexafluoride (Sulfr hexafluoride). Within each of the AP-42 sections, only emission factors for Within each of the AP-42 sections, only emission factors for criteria pollutants, carbon dioxide, hazardous air pollutants (as defined by §112(b)(1) of the Clean Air Act

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  • Analysis of Sulfur Hexafluoride in Air

    The sulfur hexafluoride analysis system is described in Hall et al. (2007) and Hall et al. (2011). Briefly, gas samples are loaded into a fixed-volume, stainless steel sample loop by flushing the loop, and then injected onto a series of packed columns using a multi-port valve.

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  • Mechanistic and Kinetic Investigations on the Thermal

    Heptafluoroisobutyronitrile (C4) has been utilized as a dielectric compound to replace sulfur hexafluoride for the sake of environmental concern. Energetic profiles of the potential energy surface for the unimolecular reaction of C4 were calculated using density functional theory (M06-2X), quadratic complete basis set (CBS-QB3), Gaussian-4, multireference Rayleigh–Schrodinger perturbation

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  • Mechanistic and Kinetic Investigations on the Thermal

    Sep 27, 2018 · Author information: (1)College of Chemistry and Molecular Sciences , Wuhan University , Wuhan , 430072 , PeopleRepublic of China. Heptafluoroisobutyronitrile (C4) has been utilized as a dielectric compound to replace sulfur hexafluoride for the sake of environmental concern.

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  • Sulfur hexafluoride Uses, Side Effects Warnings - Drugs.com

    Jan 03, 2020 · Sulfur hexafluoride is a contrast agent that is used to improve the quality of an ultrasound. Sulfur hexafluoride is used to allow certain segments of the heart, liver, or urinary tract to be seen more clearly on an ultrasound examination. Sulfur hexafluoride may also be used for purposes not listed in this medication guide.

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  • Sulfur hexafluoride - NIST

    Phase Change DataReferencesNotesGo To: Top, References, Notes Data compilation copyrightby the U.S. Secretary of Commerce on behalf of the U.S.A.All rights reserved. Data compiled as indicated in comments: BS - Robert L. Brown and Stephen E. Stein TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director AC- William E. Acree, Jr., James S. Chickos

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  • Mechanistic and Kinetic Investigations on the Thermal

    Sep 06, 2018 · Heptafluoroisobutyronitrile (C4) has been utilized as a dielectric compound to replace sulfur hexafluoride for the sake of environmental concern. Energetic profiles of the potential energy surface for the unimolecular reaction of C4 were calculated using density functional theory (M06-2X), quadratic complete basis set (CBS-QB3), Gaussian-4, multireference Rayleigh–Schrodinger perturbation

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  • Quantitative analysis of myocardial perfusion in rabbits by

    To evaluate the feasibility of real-time myocardial contrast echocardiography (RTMCE) by quantitative analysis of myocardial perfusion in rabbits, transthoracic RTMCE was performed in 10 healthy rabbits by using continuous infusion of SonoVue into the auricular vein.

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  • SULFUR HEXAFLUORIDE by portable GC 6602

    SULFUR HEXAFLUORIDE by portable GC: METHOD 5512, Issue 2, dated 15 August 1994 - Page 2 of 4 SAMPLING AND MEASUREMENT: REAGENTS: 1. Sulfur hexafluoride in air at known concentration(s) for use in field calibration. Prepared in the field by filling sample bag (see "Equipment") with verified commercial standard compressed gas*, or by injecting

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  • Sulfur hexafluoride - NIST

    IUPAC Standard InChIKey: SFZCNBIFKDRMGX-UHFFFAOYSA-N CAS Registry Number: 2551-62-4 Chemical structure: This structure is also available as a 2d Mol file; Other names: Sulfur fluoride; OC-6-11; Elegas; insulating gas; Hexafluorure de soufre; UN 1080; Esaflon; sulphur hexafluoride

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  • Sulfur hexafluoride - NIST

    Matzik, I.; Schneider, G.M., Fluid phase equilibria of binary mixtures of sulfur hexafluoride with octane, nonane, hendecane, and cis-decahydronaphthalene at temperature between 280 K and 440 K and at pressures up to 140 MPa, Ber.

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  • Correlation of carotid plaque neovascularization detected by

    Author information: (1)Department of Medical Ultrasound, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1095 Jiefang Road, Wuhan 430030, P. R. China. PURPOSE: To determine the correlation between the degree of plaque enhancement with contrast agent microbubbles and clinical symptoms in patients with

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  • Analysis of the Sensitivity of K-Type Molecular Sieve

    Sulfur hexafluoride (Sulfr hexafluoride) is widely utilized in gas-insulated switchgear (GIS). However, part of sf6 gas decomposes into different components under partial discharge (PD) conditions. Previous research has shown that the gas responses of intrinsic and 4 Å-type molecular sieve-deposited multi-wall carbon …

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  • Catalog of Guidelines and Standards for the Handling and

    in Sulfur Hexafluoride, Electrical Insulation Magazine Jan/Feb 1990 9 Institute of Electrical and Electronics Engineers, Inc. (IEEE) Boggs, S. Sulfur Hexafluoride: Introduction to the Material and Dielectric, Electrical Insulation Magazine Sep/Oct 1989 99 9 International Council on Large Electric Systems (CIGRE) CIGRE Guide for SF 6 Gas

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  • NIOSHTIC-2 Publications Search - 10003476 - Using sulphur

    However, problems such as recirculation of return into intake air, leakage from adjacent mines, lost intake air, and unknown transit flow times through stoped areas call for new ways of analyzing airflow underground. Use of sulfur hexafluoride as a tracer gas can be an effective means of analyzing these ventilation problems.

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  • DISSOCIATION OF SULFUR HEXAFLUORIDE TRACER GAS IN THE

    Dec 22, 2005 · As an odorless, non-toxic, and inert compound, sulfur hexafluoride (gaz sf6) is one of the most widely used tracer gases in indoor air quality studies in both controlled and uncontrolled environments. This compound may be subject to hydrolysis under elevated temperature to form acidic inorganic compounds such hydrogen fluoride and sulfuric acid.

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  • SULFUR HEXAFLUORIDE HAZARD SUMMARY Sulfur Hexafluoride

    * Sulfur Hexafluoride can affect you when breathed in. * Sulfur Hexafluoride can irritate the skin causing a rash or burning feeling on contact. Direct skin contact can cause frostbite. * Sulfur Hexafluoride may cause severe eye burns leading to permanent damage. * Breathing Sulfur Hexafluoride can irritate the nose and throat.

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  • CDC - NIOSH Pocket Guide to Chemical Hazards - Sulfur

    Sulfur fluoride [Note: May contain highly toxic sulfur pentafluoride as an impurity.] Colorless, odorless gas. [Note: Shipped as a liquefied compressed gas. Condenses directly to a solid upon cooling.]

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  • SULFUR HEXAFLUORIDE | CAMEO Chemicals | NOAA

    Sulfur hexafluoride (95%) 2551-62-4: Vapor 480 480 480 480 indicates greater than. A blank cell indicates the fabric has not been tested. The fabric may or may

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