This paper studies how random phase （namely, noise-perturbed phase） effects the dynamical behaviours of a simple model of power system which operates in a stable regime far away from chaotic behaviour in the absence...This paper studies how random phase （namely, noise-perturbed phase） effects the dynamical behaviours of a simple model of power system which operates in a stable regime far away from chaotic behaviour in the absence of noise. It finds that when the phase perturbation is weak, chaos is absent in power systems. With the increase of disturbed intensity σ, power systems become unstable and fall into chaos as σ further increases. These phenomena imply that random phase can induce and enhance chaos in power systems. Furthermore, the possible mechanism behind the action of random phase is addressed.展开更多
Chirped random-phase gratings are designed to produce experimentally a super-bunched focusing effect with a high bunching peak value of g(2)(0)=15.38±0.05 and a high visibility of 92.5%,greatly surpassing the the...Chirped random-phase gratings are designed to produce experimentally a super-bunched focusing effect with a high bunching peak value of g(2)(0)=15.38±0.05 and a high visibility of 92.5%,greatly surpassing the theoretical bunching peak of 2 of thermal light.Both slit-width-chirped and period-chirped random-phase gratings are studied theoretically and experimentally.The full width at half-maximum of the super-bunched curve decreases significantly with an increase in the slit number,focusing the photon pairs within a decreasing spot size.This super-bunched focusing effect can be useful for improving the resolution and the visibility of the correlation image simultaneously.展开更多
目的:观察上清散加味引经药治疗偏头痛急性发作的临床疗效。方法:选取北京中医药大学东直门医院脑病科门诊2023年7月—2024年6月就诊的偏头痛急性发作患者47例,采用随机数字表法分为A、B两组,在第一阶段(P1)分别使用上清散与布洛芬、模...目的:观察上清散加味引经药治疗偏头痛急性发作的临床疗效。方法:选取北京中医药大学东直门医院脑病科门诊2023年7月—2024年6月就诊的偏头痛急性发作患者47例,采用随机数字表法分为A、B两组,在第一阶段(P1)分别使用上清散与布洛芬、模拟剂与布洛芬干预,经过洗脱期后,第二阶段(P2)两组互换治疗方案,每组患者均先后接受两种不同干预方式,观察每组治疗有效率,各阶段治疗前及治疗后2 h、24 h VAS评分和伴随症状积分,服药后24 h、72 h内偏头痛复发情况,并通过对比治疗前后血清指标变化探究其可能的效应靶点。结果:P1治疗后24 h伴随症状积分、24 h VAS评分及24 h VAS评分下降程度组间差异有统计学意义(P<0.05),血清指标NO治疗前后差值组间差异显著(P<0.05,P<0.01);P2治疗后2 h、24 hVAS评分及伴随症状积分组间差异无统计学意义(P>0.05)。两阶段中上清散干预后2 h有效率为72.20%(26/36),显著高于模拟剂的34.20%(13/38)(χ^(2)=10.716,P=0.001),治疗后24 h VAS评分及2 h、24 h伴随症状积分差异有统计学意义(P<0.05),且72 h内偏头痛复发率降低(P<0.01)。结论:上清散对偏头痛急性期发作治疗有较好的临床效果,为中医药干预偏头痛提供临床参考。展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 10862001,10947011 and 70571017)
文摘This paper studies how random phase （namely, noise-perturbed phase） effects the dynamical behaviours of a simple model of power system which operates in a stable regime far away from chaotic behaviour in the absence of noise. It finds that when the phase perturbation is weak, chaos is absent in power systems. With the increase of disturbed intensity σ, power systems become unstable and fall into chaos as σ further increases. These phenomena imply that random phase can induce and enhance chaos in power systems. Furthermore, the possible mechanism behind the action of random phase is addressed.
基金National Natural Science Foundation of China(91750204,11774182,61475077)Higher Education Discipline Innovation Project(B07013)Fundamental Research Funds for the Central Universities。
文摘Chirped random-phase gratings are designed to produce experimentally a super-bunched focusing effect with a high bunching peak value of g(2)(0)=15.38±0.05 and a high visibility of 92.5%,greatly surpassing the theoretical bunching peak of 2 of thermal light.Both slit-width-chirped and period-chirped random-phase gratings are studied theoretically and experimentally.The full width at half-maximum of the super-bunched curve decreases significantly with an increase in the slit number,focusing the photon pairs within a decreasing spot size.This super-bunched focusing effect can be useful for improving the resolution and the visibility of the correlation image simultaneously.
文摘目的:观察上清散加味引经药治疗偏头痛急性发作的临床疗效。方法:选取北京中医药大学东直门医院脑病科门诊2023年7月—2024年6月就诊的偏头痛急性发作患者47例,采用随机数字表法分为A、B两组,在第一阶段(P1)分别使用上清散与布洛芬、模拟剂与布洛芬干预,经过洗脱期后,第二阶段(P2)两组互换治疗方案,每组患者均先后接受两种不同干预方式,观察每组治疗有效率,各阶段治疗前及治疗后2 h、24 h VAS评分和伴随症状积分,服药后24 h、72 h内偏头痛复发情况,并通过对比治疗前后血清指标变化探究其可能的效应靶点。结果:P1治疗后24 h伴随症状积分、24 h VAS评分及24 h VAS评分下降程度组间差异有统计学意义(P<0.05),血清指标NO治疗前后差值组间差异显著(P<0.05,P<0.01);P2治疗后2 h、24 hVAS评分及伴随症状积分组间差异无统计学意义(P>0.05)。两阶段中上清散干预后2 h有效率为72.20%(26/36),显著高于模拟剂的34.20%(13/38)(χ^(2)=10.716,P=0.001),治疗后24 h VAS评分及2 h、24 h伴随症状积分差异有统计学意义(P<0.05),且72 h内偏头痛复发率降低(P<0.01)。结论:上清散对偏头痛急性期发作治疗有较好的临床效果,为中医药干预偏头痛提供临床参考。
