Accurate and reliable triggering is one of the most important issues with high power pseudospark switch, because it not only has an impact on the design of discharge chamber of switch, but also has an influence on the...Accurate and reliable triggering is one of the most important issues with high power pseudospark switch, because it not only has an impact on the design of discharge chamber of switch, but also has an influence on the dynamic range of operation voltage, repetition frequencies and lifetime of switch. The unique feature of pseudospark switch is its hollow cathode geometry. The hollow cathode effect produced by the hollow cathode provides the protection of the switch for the triggering unit from erosion by high discharge plasma. In this paper, a zinc oxide (ZnO) surface flashover triggering is presented. This trigger unit possesses an excellent time delay (80 ns - 360 ns) and jitter (20 ns - 50 ns) at the switch voltage of 30 kV - 2 kV. The emitted plasma electron density is high enough to trigger switch reliably down to switch voltage of 440 V.展开更多
为评价触发点疗法联合磁振热疗法治疗慢性颈肩部疼痛的临床疗效,选取66例慢性颈肩部疼痛患者,随机分为对照组和实验组,对照组患者行磁振热治疗,实验组患者行触发点疗法联合磁振热疗法,每周治疗5次,共治疗两周。于治疗前后对两组患者进...为评价触发点疗法联合磁振热疗法治疗慢性颈肩部疼痛的临床疗效,选取66例慢性颈肩部疼痛患者,随机分为对照组和实验组,对照组患者行磁振热治疗,实验组患者行触发点疗法联合磁振热疗法,每周治疗5次,共治疗两周。于治疗前后对两组患者进行临床总有效率评价,并对两组患者进行视觉模拟评分法(visual analog scale,VAS)评分、颈椎功能障碍指数(neck disability index,NDI)评分、日常生活活动能力(activities of daily living,ADL)评分比较。结果发现:实验组患者总有效率为93.9%,对照组患者总有效率为66.7%,比较有统计学差异(P<0.05);治疗前,两组患者组间VAS评分、NDI评分及ADL评分无统计学差异(P>0.05);治疗前后,两组患者组内VAS评分、NDI评分及ADL评分比较有统计学差异(P<0.05);治疗后,两组患者组间VAS评分、NDI评分及ADL评分比较有统计学差异(P<0.05)。触发点疗法联合磁振热治疗可以减轻慢性颈肩部疼痛患者的疼痛情况,改善患者颈肩部的功能障碍,提高患者的日常生活活动能力。展开更多
基金The project supported by the National Nature Science Foundation of China(No.10035020)
文摘Accurate and reliable triggering is one of the most important issues with high power pseudospark switch, because it not only has an impact on the design of discharge chamber of switch, but also has an influence on the dynamic range of operation voltage, repetition frequencies and lifetime of switch. The unique feature of pseudospark switch is its hollow cathode geometry. The hollow cathode effect produced by the hollow cathode provides the protection of the switch for the triggering unit from erosion by high discharge plasma. In this paper, a zinc oxide (ZnO) surface flashover triggering is presented. This trigger unit possesses an excellent time delay (80 ns - 360 ns) and jitter (20 ns - 50 ns) at the switch voltage of 30 kV - 2 kV. The emitted plasma electron density is high enough to trigger switch reliably down to switch voltage of 440 V.
文摘为评价触发点疗法联合磁振热疗法治疗慢性颈肩部疼痛的临床疗效,选取66例慢性颈肩部疼痛患者,随机分为对照组和实验组,对照组患者行磁振热治疗,实验组患者行触发点疗法联合磁振热疗法,每周治疗5次,共治疗两周。于治疗前后对两组患者进行临床总有效率评价,并对两组患者进行视觉模拟评分法(visual analog scale,VAS)评分、颈椎功能障碍指数(neck disability index,NDI)评分、日常生活活动能力(activities of daily living,ADL)评分比较。结果发现:实验组患者总有效率为93.9%,对照组患者总有效率为66.7%,比较有统计学差异(P<0.05);治疗前,两组患者组间VAS评分、NDI评分及ADL评分无统计学差异(P>0.05);治疗前后,两组患者组内VAS评分、NDI评分及ADL评分比较有统计学差异(P<0.05);治疗后,两组患者组间VAS评分、NDI评分及ADL评分比较有统计学差异(P<0.05)。触发点疗法联合磁振热治疗可以减轻慢性颈肩部疼痛患者的疼痛情况,改善患者颈肩部的功能障碍,提高患者的日常生活活动能力。
