Thermal noise is one of the most fundamental limits to the sensitivity in weak equivalence principle test with a rotating torsion pendulum. Velocity damping and internal damping are two of many contributions at the th...Thermal noise is one of the most fundamental limits to the sensitivity in weak equivalence principle test with a rotating torsion pendulum. Velocity damping and internal damping are two of many contributions at the thermal noise, and which one mainly limits the torsion pendulum in low frequency is difficult to be verified by experiment. Based on the conventional method of fast Fourier transform, we propose a developed method to determine the thermal noise limit and then obtain the precise power spectrum density of the pendulum motion signal. The experiment result verifies that the thermal noise is mainly contributed by the internal damping in the fiber in the low frequency torsion pendulum experiment with a high vacuum. Quantitative data analysis shows that the basic noise level in the experiment is about one to two times of the theoretical value of internal damping thermal noise.展开更多
目的对比观察玻璃体腔注射康柏西普联合内界膜剥除与单纯内界膜剥除治疗顽固性糖尿病黄斑水肿(DME)的疗效。方法回顾性病例对照研究。将临床确诊为继发于糖尿病视网膜病变(DR)的顽固性黄斑水肿并行内界膜剥除术治疗的患者36例(36只眼)...目的对比观察玻璃体腔注射康柏西普联合内界膜剥除与单纯内界膜剥除治疗顽固性糖尿病黄斑水肿(DME)的疗效。方法回顾性病例对照研究。将临床确诊为继发于糖尿病视网膜病变(DR)的顽固性黄斑水肿并行内界膜剥除术治疗的患者36例(36只眼)纳入研究,将患者分为玻璃体腔注射康柏西普联合内界膜剥除组(联合组)16例(16只眼)和单纯内界膜剥除组(对照组)20例(20只眼)。比较两组患者手术前及手术后1、3、6个月时的最佳矫正视力(BCVA)、黄斑中心视网膜厚度(CMT)及并发症发生情况。结果联合组视网膜厚度降低明显,视力提高快,手术后1、3、6个月平均CMT分别为(343.13±74.50)μm、(300.50±60.82)μm、(267.88±56.30)μm,手术后平均CMT和log MAR BCVA与手术前比较,差异均有统计学意义(P<0.05)。对照组手术后1月视力提高不明显,与手术前比较差异无统计学意义(P=0.097)。手术后1、3、6个月视网膜厚度逐步降低,分别为(406.10±94.84)μm、(327.65±88.91)μm、(275.30±61.09)μm。组间比较,联合组手术后1个月平均log MAR BCVA和CMT均优于对照组,差异有统计学意义(P<0.05)。结论玻璃体腔注射康柏西普联合内界膜剥除能更有效促进顽固性糖尿病黄斑水肿的吸收,提高患者视力。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11575160 and 11275075)the Natural Science Foundation of Key Projects of Hubei Province,China(Grant No.2013CFA045)
文摘Thermal noise is one of the most fundamental limits to the sensitivity in weak equivalence principle test with a rotating torsion pendulum. Velocity damping and internal damping are two of many contributions at the thermal noise, and which one mainly limits the torsion pendulum in low frequency is difficult to be verified by experiment. Based on the conventional method of fast Fourier transform, we propose a developed method to determine the thermal noise limit and then obtain the precise power spectrum density of the pendulum motion signal. The experiment result verifies that the thermal noise is mainly contributed by the internal damping in the fiber in the low frequency torsion pendulum experiment with a high vacuum. Quantitative data analysis shows that the basic noise level in the experiment is about one to two times of the theoretical value of internal damping thermal noise.
文摘目的对比观察玻璃体腔注射康柏西普联合内界膜剥除与单纯内界膜剥除治疗顽固性糖尿病黄斑水肿(DME)的疗效。方法回顾性病例对照研究。将临床确诊为继发于糖尿病视网膜病变(DR)的顽固性黄斑水肿并行内界膜剥除术治疗的患者36例(36只眼)纳入研究,将患者分为玻璃体腔注射康柏西普联合内界膜剥除组(联合组)16例(16只眼)和单纯内界膜剥除组(对照组)20例(20只眼)。比较两组患者手术前及手术后1、3、6个月时的最佳矫正视力(BCVA)、黄斑中心视网膜厚度(CMT)及并发症发生情况。结果联合组视网膜厚度降低明显,视力提高快,手术后1、3、6个月平均CMT分别为(343.13±74.50)μm、(300.50±60.82)μm、(267.88±56.30)μm,手术后平均CMT和log MAR BCVA与手术前比较,差异均有统计学意义(P<0.05)。对照组手术后1月视力提高不明显,与手术前比较差异无统计学意义(P=0.097)。手术后1、3、6个月视网膜厚度逐步降低,分别为(406.10±94.84)μm、(327.65±88.91)μm、(275.30±61.09)μm。组间比较,联合组手术后1个月平均log MAR BCVA和CMT均优于对照组,差异有统计学意义(P<0.05)。结论玻璃体腔注射康柏西普联合内界膜剥除能更有效促进顽固性糖尿病黄斑水肿的吸收,提高患者视力。
