SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power industry.However,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the a...SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power industry.However,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the atmosphere,it is not easily degradable and is of great potential harm to the environment.Based on pulsed dielectric barrier discharge plasma technology,the effects of H_(2)O and 0_(2) on the degradation of SF_(6) were studied.Studies have shown that H_(2)O can effectively promote the decomposition of SF_(6) and improve its degradation rate and energy efficiency of degradation.Under the action of a pulse input voltage and input frequency of 15 kV and 15 kHz,respectively,when H_(2)O is added alone the effect of 1% H_(2)O is the best,and the rate and energy efficiency of degradation of SF_(6) reach their maximum values,which are 91.9% and 8.25 g kWh^(-1),respectively.The synergistic effect of H_(2)O and O_(2) on the degradation of SF_(6) was similar to that of H_(2)O.When the concentration of H_(2)O and O_(2) was 1%,the system obtained the best rate and energy efficiency of degradation,namely 89.7% and 8.05 g kWh~(-1),respectively.At the same time,different external gases exhibit different capabilities to regulate decomposition products.The addition of H_(2)O can effectively improve the selectivity of S0_(2).Under the synergistic effect of H_(2)O and O_(2),with increase in O_(2) concentration the degradation products gradually transformed into SO_(2)F_(2).From the perspective of harmless treatment of the degradation products of SF_(6),the addition of O_(2) during the SF_(6) degradation process should be avoided.展开更多
通过控制尿素分解速率来改变体系pH的方法,将钛酸丁酯水解的胶体二氧化钛吸附到天然高分子纤维素上,得到纤维素/二氧化钛复合材料.分别以紫外光或太阳光为光源,研究纤维素/二氧化钛复合材料对甲基橙水溶液的催化降解性能.用傅里叶红外...通过控制尿素分解速率来改变体系pH的方法,将钛酸丁酯水解的胶体二氧化钛吸附到天然高分子纤维素上,得到纤维素/二氧化钛复合材料.分别以紫外光或太阳光为光源,研究纤维素/二氧化钛复合材料对甲基橙水溶液的催化降解性能.用傅里叶红外光谱仪表征了复合材料的结构.结果表明:二氧化钛与纤维素形成的氢键等分子间作用力使二氧化钛被吸附到纤维素上,复合材料出现787cm 1的O Ti O键的吸收峰.纤维素与钛酸丁酯的较佳比例为20g与4.3mL.在紫外光照射100min下,复合材料对甲基橙水溶液的光催化降解率为100%;在太阳光照射150 min,复合材料对甲基橙水溶液的光催化降解率为81%;复合材料可反复降解甲基橙水溶液5次.本实验合成的纤维素/二氧化钛复合材料具有可完全生物降解、能利用太阳光、反复催化降解甲基橙水溶液的特性,可应用于处理甲基橙等染料废水.展开更多
研究以中文社会科学引文索引(CSSCI)和Web of Science为数据来源,通过文献计量学和Citespace可视化分析,对2005-2014年期间两刊刊登的文献进行分析,从发文数量、高产出学术研究机构分布、高产出学者、高影响力学者、研究热点的演变、研...研究以中文社会科学引文索引(CSSCI)和Web of Science为数据来源,通过文献计量学和Citespace可视化分析,对2005-2014年期间两刊刊登的文献进行分析,从发文数量、高产出学术研究机构分布、高产出学者、高影响力学者、研究热点的演变、研究前沿等进行知识图谱可视化分析。研究发现:1《电化教育研究》高产出学术研究机构主要集中在师范大学,《教育技术与社会》高产出学者主要集中在我国台湾,显示出我国台湾教育技术研究在国际上的实力与水平。2何克抗、南国农、祝智庭、维果斯基(VYGOTSKYL S)、黄国祯(HWANG GJ)、乔纳森(JONASSEN D H)等学者在国内外教育技术领域具有较高影响力。3《教育技术与社会》的前沿主要包括:远程教育研究类、信息化教学设计类、创新学习方法与学习环境类、新技术新媒体研究类四类研究主题内容;《电化教育研究》的前沿主要包括:远程教育研究类、学习资源与学习环境类、创新学习方法和教学模式类、理论研究类四类研究主题内容。展开更多
基金supported by Guizhou Province (Ceneral), grant/award number Qian Ke He Zhi Cheng [2022] General 207, National Natural Science Foundation of China (No. 52307170)Natural Science Foundation of Hubei Province, China (No. 2023AFB382)。
文摘SF_(6) has excellent insulation performance and arc extinguishing ability,and is widely used in the power industry.However,its global warming potential is about 23,500 times that of C0_(2),it can exist stably in the atmosphere,it is not easily degradable and is of great potential harm to the environment.Based on pulsed dielectric barrier discharge plasma technology,the effects of H_(2)O and 0_(2) on the degradation of SF_(6) were studied.Studies have shown that H_(2)O can effectively promote the decomposition of SF_(6) and improve its degradation rate and energy efficiency of degradation.Under the action of a pulse input voltage and input frequency of 15 kV and 15 kHz,respectively,when H_(2)O is added alone the effect of 1% H_(2)O is the best,and the rate and energy efficiency of degradation of SF_(6) reach their maximum values,which are 91.9% and 8.25 g kWh^(-1),respectively.The synergistic effect of H_(2)O and O_(2) on the degradation of SF_(6) was similar to that of H_(2)O.When the concentration of H_(2)O and O_(2) was 1%,the system obtained the best rate and energy efficiency of degradation,namely 89.7% and 8.05 g kWh~(-1),respectively.At the same time,different external gases exhibit different capabilities to regulate decomposition products.The addition of H_(2)O can effectively improve the selectivity of S0_(2).Under the synergistic effect of H_(2)O and O_(2),with increase in O_(2) concentration the degradation products gradually transformed into SO_(2)F_(2).From the perspective of harmless treatment of the degradation products of SF_(6),the addition of O_(2) during the SF_(6) degradation process should be avoided.
文摘通过控制尿素分解速率来改变体系pH的方法,将钛酸丁酯水解的胶体二氧化钛吸附到天然高分子纤维素上,得到纤维素/二氧化钛复合材料.分别以紫外光或太阳光为光源,研究纤维素/二氧化钛复合材料对甲基橙水溶液的催化降解性能.用傅里叶红外光谱仪表征了复合材料的结构.结果表明:二氧化钛与纤维素形成的氢键等分子间作用力使二氧化钛被吸附到纤维素上,复合材料出现787cm 1的O Ti O键的吸收峰.纤维素与钛酸丁酯的较佳比例为20g与4.3mL.在紫外光照射100min下,复合材料对甲基橙水溶液的光催化降解率为100%;在太阳光照射150 min,复合材料对甲基橙水溶液的光催化降解率为81%;复合材料可反复降解甲基橙水溶液5次.本实验合成的纤维素/二氧化钛复合材料具有可完全生物降解、能利用太阳光、反复催化降解甲基橙水溶液的特性,可应用于处理甲基橙等染料废水.
文摘研究以中文社会科学引文索引(CSSCI)和Web of Science为数据来源,通过文献计量学和Citespace可视化分析,对2005-2014年期间两刊刊登的文献进行分析,从发文数量、高产出学术研究机构分布、高产出学者、高影响力学者、研究热点的演变、研究前沿等进行知识图谱可视化分析。研究发现:1《电化教育研究》高产出学术研究机构主要集中在师范大学,《教育技术与社会》高产出学者主要集中在我国台湾,显示出我国台湾教育技术研究在国际上的实力与水平。2何克抗、南国农、祝智庭、维果斯基(VYGOTSKYL S)、黄国祯(HWANG GJ)、乔纳森(JONASSEN D H)等学者在国内外教育技术领域具有较高影响力。3《教育技术与社会》的前沿主要包括:远程教育研究类、信息化教学设计类、创新学习方法与学习环境类、新技术新媒体研究类四类研究主题内容;《电化教育研究》的前沿主要包括:远程教育研究类、学习资源与学习环境类、创新学习方法和教学模式类、理论研究类四类研究主题内容。
