Modulation instability of dispersion-shifted fiber couplers

The nonlinear coupled-mode equations are rewritten by even and odd modes.We study modulation instability(MI) of dispersion-shifted fiber couplers when either even or odd mode is launched alone by using zero-dispersion wavelength relatively long(quasi-cw) pulses.The result shows that there are new types of MI in both the normal-dispersion and the anomalous-dispersion regimes.MI is concerned with forth-order dispersion and has no relation with third-order dispersion.Quasi-cw can be changed into pulses array under certain conditions.We can extract super short pulse from this.Furthermore,the bandwidth of gain spectra widens and its strength accretes as the input power increases.

复方蒲芩胶囊联合阿奇霉素治疗肺炎的临床研究

目的研究复方蒲芩胶囊联合阿奇霉素胶囊治疗肺炎的临床疗效。方法选取2015年4月—2017年4月天门市第一人民医院收治的肺炎患者120例作为研究对象,所有患者随机分为对照组和治疗组,每组各60例。对照组口服阿奇霉素胶囊,1粒/次,1次/d。治疗组在对照组基础上口服复方蒲芩胶囊,3粒/次,3次/d。两组患者均连续治疗10 d。观察两组的临床疗效,比较两组的临床症状消失时间和血清炎性因子水平。结果治疗后,对照组和治疗组的总有效率分别为78.33%、93.33%,两组比较差异有统计学意义(P<0.05)。治疗后,治疗组咳嗽消失时间、白细胞恢复正常时间、体温恢复正常时间和啰音消失时间均短于对照组,两组比较差异有统计学意义(P<0.05)。治疗后,两组超敏C-反应蛋白(hs-CRP)、白细胞计数、中性粒细胞数水平显著降低,同组治疗前后比较差异有统计学意义(P<0.05);且治疗组血清炎性因子水平明显低于对照组,两组比较差异具有统计学意义(P<0.05)。结论复方蒲芩胶囊联合阿奇霉素胶囊治疗肺炎具有较好的临床疗效,可改善临床症状,调节炎性因子水平,安全性较好,具有一定的临床推广应用价值。