增色散对蛋鸡生产性能和鸡蛋品质改良的初步研究

增色散由辣椒、红花、黄芪、女贞子等味中草药精制而成。通过试验表明，试验组比对照组产蛋率提高９．６４％（Ｐ＜０．０１）；饲料报酬提高９．５７％；蛋黄色泽提高２．１３级；鸡蛋破损率降低１２．９％；蛋壳重量有所提高。

飞秒孤子在色散渐增光纤中谱压缩的数值分析

通过数值求解修正了的广义非线性薛定谔方程,研究了孤子在色散渐增光纤中的谱压缩进程.详细分析了入射脉冲峰值功率对输出脉冲的谱宽和中心波长的影响,并描述了脉冲的脉宽、谱宽及啁啾在光纤中的演化过程.计算结果表明,脉宽200fs、中心波长1550nm的基孤子在群速度色散从-1ps2/km至-11ps2/km线性变化的长100m的色散渐增光纤中传输时,脉冲谱宽由12.6nm压缩至5.2nm,即可获得最大压缩比为2.42.

Antibacterial Activity of Herbal Preparations against Staphylococcus aureus and Streptococcus agalactiae in Cow Mastitis

[Objective] This study aimed to analyze the antibacterial activity of herbal preparations against Staphylococcus aureus and Streptococcus agalactiae in cow mastitis. [Method] The crude drug solutions of four different prescriptions for Zengrujianniusan were prepared through reflux extraction. Their antibacterial activity in vitro against Staphylococcus aureus and Streptococcus agalactiae in cow mastitis were investigated. [Result] All the four different prescriptions exhibited antibacterial activity against S. aureus and S. agalactiae. Among them, prescription Ⅲ was extremely sensitive, and had the best bactericidal effect. The other three prescriptions were highly sensitive. [Conclusion] This study provides a theoretical basis for the development of herbal preparations for the treatment of cow mastitis.

基于啁啾补偿技术的自相似脉冲压缩光纤设计

为了获得高功率优质的超短脉冲光源,利用色散渐增光纤产生的强线性啁啾对自相似脉冲进行了啁啾补偿光纤设计。首先利用色散补偿光纤得到了半峰全宽为52.6fs、峰值功率为684.5W的超短脉冲输出。在此基础上研究了色散渐增的补偿光纤设计,讨论了色散线性渐增光纤和色散指数渐增光纤对自相似脉冲的压缩影响。当色散渐增系数取1km^(-1),5km^(-1),10km^(-1)时,通过数值仿真得出了最短的输出脉宽、峰值功率以及所需的补偿光纤长度。结果表明,色散渐增光纤能缩短补偿光纤的长度,减小脉冲压缩时产生的损耗,得到半峰全宽为61.8fs和64.4fs的高功率超短脉冲输出。这一结果对自相似脉冲压缩光纤的设计是有帮助的。