目的急性脑梗死患者血清尿酸水平与脑微出血(cerebral microbleed,CMB)的相关性研究。方法连续性收录作者医院2012-01/2015-01月收治的急性脑梗死患者220例,根据磁共振成像(magnetic resonance imaging,MRI)结果分为CMB组(n=90)和非CMB...目的急性脑梗死患者血清尿酸水平与脑微出血(cerebral microbleed,CMB)的相关性研究。方法连续性收录作者医院2012-01/2015-01月收治的急性脑梗死患者220例,根据磁共振成像(magnetic resonance imaging,MRI)结果分为CMB组(n=90)和非CMB组(n=130)。分析比较入院当天和出院时血尿酸水平与CMB的相关性。结果入院时CMB组患者尿酸水平明显低于非CMB患者,2组比较差异具有统计学意义(P<0.05),CMB重度亚组患者明显高于轻度亚组患者,2组比较差异具有统计学意义(P<0.05)。对于CMB诊断价值方面,可见入院时尿酸的曲线下面积(area under the curve,AUC)为0.802,cut-off值为284.22,敏感性为80.30%、特异性为75.71%。出院时尿酸的AUC为0.713,cut-off值为260.31,敏感性为79.14%,特异性为82.22%。入院时尿酸(r=0.722,P<0.05)和出院时尿酸(r=0.682,P<0.05)水平与CMB均呈正相关。结论急性脑梗死患者血尿酸水平与CMB密切相关,是诊断CMB的潜在生物学标记物。展开更多
We report a single-frequency linearly polarized Q-switched fiber laser based on an Nb_(2)GeTe_(4)saturable absorber(SA).The Nb_(2)GeTe_(4)SA triggers passive Q-switching of the laser,and an un-pumped Yb-doped fiber to...We report a single-frequency linearly polarized Q-switched fiber laser based on an Nb_(2)GeTe_(4)saturable absorber(SA).The Nb_(2)GeTe_(4)SA triggers passive Q-switching of the laser,and an un-pumped Yb-doped fiber together with a 0.08-nmbandwidth polarization-maintaining fiber Bragg grating(FBG)acts as an ultra-narrow bandwidth filter to realize singlelongitudinal-mode(SLM)oscillation.The devices used in the laser are all kept polarized,so as to ensure linearly polarized laser output.Stable SLM linearly polarized Q-switching operation at 1064.6 nm is successfully achieved,producing a laser with a shortest pulse width of 1.36μs,a linewidth of 28.4 MHz,a repetition rate of 28.3 kHz-95.9 kHz,and a polarization extinction ratio of about 30 dB.It is believed that the single-frequency linearly polarized pulsed fiber laser studied in this paper has great application value in gravitational wave detection,beam combining,nonlinear frequency conversion,and other fields.展开更多
文摘目的急性脑梗死患者血清尿酸水平与脑微出血(cerebral microbleed,CMB)的相关性研究。方法连续性收录作者医院2012-01/2015-01月收治的急性脑梗死患者220例,根据磁共振成像(magnetic resonance imaging,MRI)结果分为CMB组(n=90)和非CMB组(n=130)。分析比较入院当天和出院时血尿酸水平与CMB的相关性。结果入院时CMB组患者尿酸水平明显低于非CMB患者,2组比较差异具有统计学意义(P<0.05),CMB重度亚组患者明显高于轻度亚组患者,2组比较差异具有统计学意义(P<0.05)。对于CMB诊断价值方面,可见入院时尿酸的曲线下面积(area under the curve,AUC)为0.802,cut-off值为284.22,敏感性为80.30%、特异性为75.71%。出院时尿酸的AUC为0.713,cut-off值为260.31,敏感性为79.14%,特异性为82.22%。入院时尿酸(r=0.722,P<0.05)和出院时尿酸(r=0.682,P<0.05)水平与CMB均呈正相关。结论急性脑梗死患者血尿酸水平与CMB密切相关,是诊断CMB的潜在生物学标记物。
基金Project supported by the National Natural Science Foundation of China(Grant No.62275272)the Training Program for Excellent Young Innovators of Changsha,China(Grant No.KQ2206003).
文摘We report a single-frequency linearly polarized Q-switched fiber laser based on an Nb_(2)GeTe_(4)saturable absorber(SA).The Nb_(2)GeTe_(4)SA triggers passive Q-switching of the laser,and an un-pumped Yb-doped fiber together with a 0.08-nmbandwidth polarization-maintaining fiber Bragg grating(FBG)acts as an ultra-narrow bandwidth filter to realize singlelongitudinal-mode(SLM)oscillation.The devices used in the laser are all kept polarized,so as to ensure linearly polarized laser output.Stable SLM linearly polarized Q-switching operation at 1064.6 nm is successfully achieved,producing a laser with a shortest pulse width of 1.36μs,a linewidth of 28.4 MHz,a repetition rate of 28.3 kHz-95.9 kHz,and a polarization extinction ratio of about 30 dB.It is believed that the single-frequency linearly polarized pulsed fiber laser studied in this paper has great application value in gravitational wave detection,beam combining,nonlinear frequency conversion,and other fields.
