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中国稀土学会2021学术年会

作者： Song Enhai He Fanquan Zhou Yayun Zhiguo Xia Zhang Qinyuan State Key Laboratory of Luminescent Material and Devices and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices South China University of Technology

The discovery of highly efficient broadband near infrared (NIR) emission material is urgent and crucial for constructing NIR lighting sources and the emerging ***,a series of NIR emission hexafluorides ABMF:Cr(A=Na,K,Rb,Cs;B=Li,Na,K,Cs;M=Al,Ga,Sc,In) peaking at～733-801 nm with a full width at half maximum (FWHM) of～98-115 nm are synthesized by a general ammonium salt–assisted synthesis *** from the pre-ammoniation of the trivalent metal sources,the Crcan be more efficiently doped into the ABMF and simultaneously prevent the generation of competitive ***,NaScF:Cr(λ=774 nm,FWHM=～108 nm) with optimal Crdoping concentration of 35.96%shows a high internal quantum efficiency of 91.5%and an external quantum efficiency of～40.82%.A lighting emitting diode(LED) device with a NIR output power of～291.05 m W at 100 m A driven current and a high photoelectric conversion efficiency of 20.94%is *** general synthesis strategy opens up new avenues for the exploration of Crdoped high efficiency phosphors,and the as-obtained record NIR output power demonstrates for NIR LED lighting sources applic

关键词： High efficiency Cr3+ hexafluoride NIR LED lighting sources

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The Use of SF6and GIS to Study Farfield Modeling of Ocean Outfall Plumes in Florida

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Journal of Environmental Protection 2014年第11期5卷 1037-1052页

作者： Frederick Bloetscher Fernando J. Pleitez Thomas Romah Ahmed Albasri Chase Dickinson Husayn El Sharif Kevin Matthews Trung-Duong Nguyen Lucrece Riche Frank Youngman Thomas P. Carsey Jack Stamates John R. Proni Applied Research Center (ARC) Florida International University Miami FL USA Atlantic Oceanographic and Meteorological Laboratory Ocean Chemistry Division Miami FL USA Florida Atlantic University Civil Engineering Department Boca Raton FL USA

In June, 2004 and February, 2007, in field tracer studies were conducted on the Hollywood and South Central outfalls, using sulfur hexafluoride (SF6) as a tracer. The objective of these studies was to determine if the tracer could be detected in the farfield at significant distance, and if so, could this data be used to construct a model of the farfield plume. Prior models for farfield plume movement do not appear to comport well with the conditions in southeast Florida. Extensive research was conducted in southeast Florida on 4 outfalls, which led to the development of nearfield dilution equations for same. However farfield modeling of outfall plumes was difficult to accomplish because the tracers used are not detectable for significant distances. The SF6 resolved that problem and as a result the Hollywood outfall was used to construct a model. Two methods were investigated for modeling the plume, 1) the Eureqa formulation method and 2) the Gamma-Curve method. The concentrations in the x-y plane were first found by using the Eureqa formulation to calculate the concentration at each grid point given its depth and the concentration of the centerline at the same latitude. The plume models were generated using MATLAB that matched with the results actually seen in the field.

关键词： Ocean Outfall Treated Sewage Effluent Disposal Farfield Modeling Sulfur hexafluoride

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High Density Fluorine Negative-Ion Source Generated by Utilizing Magnetized SF6

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Journal of Modern Physics 2014年第2期5卷 89-91页

作者： M. Abid Imtiaz Tetsu Mieno Department of Physics Faculty of Science Shizuoka University Shizuoka-shi Japan

In a magnetized plasma column generated from an electronegative gas, negative-ions accumulate around the plasma column via radial diffusion. In this study, a dc discharge is applied in SF6 gas to produce a plasma column, and the radial density profile of negative-ions is measured by Langmuir probes using the modified Bohm criterion. The gas pressure and discharge current dependences of negative-ion density are also measured. It is found that the negative-ion density of 8.0 × 1017 m-3 is obtained around the plasma column at r = 1.0 cm when SF6 pressure is 0.13 Pa and discharge current is 0.50 A. The negative-ion density has radial gradient, and the electron density is much lower in this region.

关键词： Fluorine Negative-Ion Ion Source String-Type Plasma Radial Diffusion Langmuir Probe Magnetized Plasma Sulfur hexafluoride

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SF6Byproducts in High-Humidity Environment: an Experimental Evaluation between 200oC and 500oC

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Journal of Electromagnetic Analysis and Applications 2011年第6期3卷 179-183页

作者： Yu Wang Li Li Weijian Yao Guangdong Power Grid Company

Abstract: In the occurrence of arc discharges, spark discharges, corona discharges and overheated faults in electrical equipment, SF 6would be decomposed to complicated byproducts, such as SO2 , H2S and HF. Analyzing these byproducts is an effective method to judge the internal operation condition of electric equipment. In order to study characters of SF6byproducts at different temperature of overheated faults in the electric equipment, a series of overheated faults of electric equipment were simulated. SF6is very stable and not significantly decomposed at 200oC, 250oC and 300oC. SF6is significantly decomposed to SO2, H2S and HF at 350oC. The concentration of SO2, H2S and HF was 7.2, 1.6 and 1.9 μL/L after heating for 5 hours in environment of SF6with 3616 μL/L water, and it was increased to 23.0, 3.0 and 1.2 μL/L 3 hours later. SF6is more easily to be decomposed and decomposed more rapidly at higher temperature. The concentration of SO2, H2S and HF was 62.2, 15.6 and 3.6 μL/L after heating for 5 hours in environment of SF6with 4064 μL/L water, and it was increased to 91.4, 25.2 and 2.3 μL/L 3 hours later. SF6will be decomposed to format HF, which is strongly corrosive and whose concentration is likely to decrease when it is above a certain concentration.

关键词： Sulfur hexafluoride Overheating Faults Byproducts Sulfur Dioxide Sulfureted Hydrogen Hydrofluoric Acid

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浅谈六氟化硫气体介质的危害

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管理观察 2008年第14期 148-150页

作者：张瑞梅胜利油田电力管理总公司

SF6气体因其优异的绝缘、灭弧性能及化学稳定性,已被广泛地应用在电力设备中,如高压断路器、变压器、互感器、电容器、避雷器、熔断器、管道母线等。随着SF6气体使用量的增加,范围的扩大,人们对其在使用过程中产生的危害有进一步的认识... 详细信息

SF6气体因其优异的绝缘、灭弧性能及化学稳定性,已被广泛地应用在电力设备中,如高压断路器、变压器、互感器、电容器、避雷器、熔断器、管道母线等。随着SF6气体使用量的增加,范围的扩大,人们对其在使用过程中产生的危害有进一步的认识。至2030年,六氟化硫气体将被禁止使用。

关键词：六氟化硫气体Sulphur hexafluoride gas 绝缘材料Insulation materials 高压开关设备HV switchgears 环境污染envi ronment pollution

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