The environmentally friendly gas C4F7N has been considered a potential replacement for SF6 due to its excellent insulation. At present, research on and mixture mainly focuses insulation performance, but few people study surface discharge mechanism variation law. In order the characteristics of C4F7N/CO2 mixture, fluid model was established simulated by COMSOL, which used streamers during discha...

HIGHLIGHTS Monitoring system with analysis through intelligent techniques. Predictive assessment of the operating conditions circuit breakers. lightning arresters in face atmospheric discharges. Process detection and localization internal faults SF6 substations.

To study the effects of different intravitreal gases on intraocular tissues, adult pigmented rabbits were given 0.4 mL intravitreal injections of air, 50% sulfur hexafluoride (SF6) and air, 100% SF6, 50% perfluoropropane (C3F8), or 100% C3F8. On postinjection days 1, 4, 7, and 14, the eyes were removed and the iris, ciliary body and retina processed for light and electron microscopy. Histopatho...

BACKGROUND Isoexpansile concentrations of intraocular gases are typically used as tamponading agent in macular hole surgery. Using a small volume of the pure form of these gases may achieve the same result without increasing the incidence of postoperative complications. The purpose of this study was to evaluate the anatomical and visual outcomes following macular hole surgery with 2 cc pure (10...

Chloride (Cl), stable isotope ratios of water (dO and dH), sulfur hexafluoride (SF6), tritium (H), carbon-14 (C), noble gases (He, Ne, and Ar), and hydrometry were used to characterize groundwater-surface water interactions, in particular infiltration rates, for the Lower Namoi River (New South Wales, Australia). The study period (four sampling campaigns between November 2009 and November 2011)...

We performed single-breath washout (SBW) tests in which He and sulfur hexafluoride (SF6) were inspired throughout the vital capacity inspirations or were inhaled as discrete boluses at different points in the inspiration. Tests were performed in normal gravity (1 G) and in up to 27 s of microgravity (microG) during parabolic flight. The phase III slope of the SBW could be accurately reconstruct...

Several reports have been published on methods for treating hypotony maculopathy. Currently, the preferred choice of treatment depends on the severity of the illness. We experienced four cases of traumatic hypotony maculopathy and treated them by various methods. Cases 1-3 were treated by various surgical treatments. Case 1 was treated by combined cataract surgery and pars plana vitrectomy. The...

High resolution X-ray spectroscopic studies on free SF6 molecules and SF6 clusters near the S 2p ionization thresholds are reported. Spectral changes occurring in clusters for the intense molecular-like S 2p1/2,3/2 → 6a1g-, 2t2g-, and 4eg-resonances are examined in detail. Neither gas-to-cluster spectral shifts nor changes in peak shape are observed for the pre-edge 6a1g-band. Significant chang...

Sulfur dioxide (SO2) is a typical sulfur hexafluoride (SF6) decomposition by product in gas insulated switchgear (GIS). Online monitoring and analyzing SO2 gas concentration can timely and effectively evaluate the insulation performance of SF6-gas-insulated apparatus. In this study, pure and 3 at % Cu-doped SnO2 microspheres were synthesized via a simple and facile hydrothermal method, and were...

To provide additional validation data for the multizone airflow and contaminant model, CONTAMW, experiments were performed in an occupied 3-story townhouse in Reston, VA. A tracer gas, sulfur hexaflouride (SF6), was manually injected within one room of the house and the concentration of SF6 was measured in each zone. This same process was then recreated in CONTAMW and the resulting predictions ...