The spectra with wavelength range of 390 nm to 660 nm of triggered lightning were observed in Guangdong Area using a slitless spectrograph. The characteristics of the lightning spectra during the initial continuous cu...The spectra with wavelength range of 390 nm to 660 nm of triggered lightning were observed in Guangdong Area using a slitless spectrograph. The characteristics of the lightning spectra during the initial continuous current and return strokes were analyzed, and the differences between the metal section and air section of the lightning channel were compared. The results showed that the metal spectra were contained in the metal section during the initial continuous current. As for the lightning channel of the return strokes, the line spectra for both the metal section and the air section were identical;neither of the two sections contained the metal spectra, but the relative intensity of its emission spectrum was different. Owing to different radiation mechanisms, the spectral structures and luminance of the two sections were not the same. Combined with the current data, it was found that there was a good positive correlation between the total spectral strength and the transferred charge. The total intensity of the lightning channel spectrum increased with the height of the channel, indicating that the radiation sequence of the lightning channel was different. High temporal resolution observations showed that the spectral line duration could be divided into three categories, in which the lines with higher excitation energy appear first and decay rapidly, while those with lower excitation energy appear later but last longer.展开更多
利用无狭缝摄谱技术获取了中国广东一次人工触发闪电通道等离子体的光谱.基于光谱诊断方法确定了该触发闪电通道电流的最大值与最小值分别为30.9 kA和25.6 kA,并采用线性电流衰减传输线模型(modified transmission line with linear cur...利用无狭缝摄谱技术获取了中国广东一次人工触发闪电通道等离子体的光谱.基于光谱诊断方法确定了该触发闪电通道电流的最大值与最小值分别为30.9 kA和25.6 kA,并采用线性电流衰减传输线模型(modified transmission line with linear current decay,MTLL)对电流进行了模拟.在此基础上,采用时域有限差分方法(finite-difference time-domain,FDTD)和传输线模型研究了不同距离处的电场分布特征,并对58 m处产生的电场进行了比较.结果发现:当回击速度取1.3×10^(8) m/s时,辐射电场与实验垂直电场偏差较大,但与FDTD方法模拟的垂直电场符合一致.进一步,采用FDTD方法、偶极子方法、电荷-磁场极限估算法研究了58 m,90 m,1.6 km的磁场分布.与实验数据比较发现:不同计算方法与实验值在58 m和90 m处有一定差异,但在1.6 km处符合一致.展开更多
目的:探讨触发点弹拨手法联合中药封包治疗前斜角肌综合征的临床效果。方法:回顾性选取2022年4月—2024年7月赣州市中医院收治的前斜角肌综合征患者82例为研究对象,根据治疗方案的不同,将患者分为对照组与观察组,各41例。两组均给予常...目的:探讨触发点弹拨手法联合中药封包治疗前斜角肌综合征的临床效果。方法:回顾性选取2022年4月—2024年7月赣州市中医院收治的前斜角肌综合征患者82例为研究对象,根据治疗方案的不同,将患者分为对照组与观察组,各41例。两组均给予常规针刺治疗,对照组针刺完毕后予常规推拿治疗,观察组针刺完毕后弹拨斜角肌触发点,并给予中药封包治疗。比较两组的中医症候积分、临床疗效、疼痛情况[视觉模拟评分法(visual analogue scale,VAS)评分]及上肢功能[臂、肩、手功能障碍(disabilites of the arm,shoulder,and hand,DASH)评分]。结果:治疗后,观察组治疗总有效率高于对照组,中医症候各项积分、VAS评分、DASH评分均低于对照组,差异均有统计学意义(P<0.05)。结论:触发点弹拨手法联合中药封包可提高前斜角肌综合征的临床疗效,缓解疼痛,提高上肢功能。展开更多
基金supported by the Open Fund of the State Key Laboratory of Severe Weather of the Chinese Academy of Meteorological Sciences (Grant No. 2019LASW-B08)as a Basic Research Project of the Chinese Academy of Meteorological Sciences (Grant No. 2015Z006. 2016Z005)
文摘The spectra with wavelength range of 390 nm to 660 nm of triggered lightning were observed in Guangdong Area using a slitless spectrograph. The characteristics of the lightning spectra during the initial continuous current and return strokes were analyzed, and the differences between the metal section and air section of the lightning channel were compared. The results showed that the metal spectra were contained in the metal section during the initial continuous current. As for the lightning channel of the return strokes, the line spectra for both the metal section and the air section were identical;neither of the two sections contained the metal spectra, but the relative intensity of its emission spectrum was different. Owing to different radiation mechanisms, the spectral structures and luminance of the two sections were not the same. Combined with the current data, it was found that there was a good positive correlation between the total spectral strength and the transferred charge. The total intensity of the lightning channel spectrum increased with the height of the channel, indicating that the radiation sequence of the lightning channel was different. High temporal resolution observations showed that the spectral line duration could be divided into three categories, in which the lines with higher excitation energy appear first and decay rapidly, while those with lower excitation energy appear later but last longer.
文摘利用无狭缝摄谱技术获取了中国广东一次人工触发闪电通道等离子体的光谱.基于光谱诊断方法确定了该触发闪电通道电流的最大值与最小值分别为30.9 kA和25.6 kA,并采用线性电流衰减传输线模型(modified transmission line with linear current decay,MTLL)对电流进行了模拟.在此基础上,采用时域有限差分方法(finite-difference time-domain,FDTD)和传输线模型研究了不同距离处的电场分布特征,并对58 m处产生的电场进行了比较.结果发现:当回击速度取1.3×10^(8) m/s时,辐射电场与实验垂直电场偏差较大,但与FDTD方法模拟的垂直电场符合一致.进一步,采用FDTD方法、偶极子方法、电荷-磁场极限估算法研究了58 m,90 m,1.6 km的磁场分布.与实验数据比较发现:不同计算方法与实验值在58 m和90 m处有一定差异,但在1.6 km处符合一致.
文摘目的:探讨触发点弹拨手法联合中药封包治疗前斜角肌综合征的临床效果。方法:回顾性选取2022年4月—2024年7月赣州市中医院收治的前斜角肌综合征患者82例为研究对象,根据治疗方案的不同,将患者分为对照组与观察组,各41例。两组均给予常规针刺治疗,对照组针刺完毕后予常规推拿治疗,观察组针刺完毕后弹拨斜角肌触发点,并给予中药封包治疗。比较两组的中医症候积分、临床疗效、疼痛情况[视觉模拟评分法(visual analogue scale,VAS)评分]及上肢功能[臂、肩、手功能障碍(disabilites of the arm,shoulder,and hand,DASH)评分]。结果:治疗后,观察组治疗总有效率高于对照组,中医症候各项积分、VAS评分、DASH评分均低于对照组,差异均有统计学意义(P<0.05)。结论:触发点弹拨手法联合中药封包可提高前斜角肌综合征的临床疗效,缓解疼痛,提高上肢功能。
