Numerical analysis of mode locking in multi-core photonic crystal fiber

With linearly coupled nonlinear Schrodinger equations, numerical analysis has been performed on the mode locking forming pro-cedure of a fiber laser in the linear cavity configuration. The fiber is Yb-doped multi-core photonic crystal fiber and semiconductor saturable absorber mirror (SESAM) is adopted as the nonlinear transmission element to start mode locking. Because of the noise randomness, initial pulse would be picked out by SESAM in one or more cores which makes the multi-core mode locking quite different from single-core one. The two situations are compared and fully discussed. Mode locking in multi-core photonic crystal fiber laser can be realized only if the couple coefficient between the cores and the temporal overlap between the pulses in different cores are large enough.     

分散在松节油中的金超微粒子的性质

用金属蒸气的低温基质隔离法制备了分散在松节油中的金超微粒子。它对松节油有催化氧化作用,使α-蒎烯和β-蒎烯氧化成马鞭草烯醇、马鞭草烯酮、桃金娘烯醇、桃金娘烯醛和松香芹醇。     

硫酸铝法合成碱式碳酸钠铝的研究

介绍了无机阻燃剂的生产和发展，应用正交试验法进行了碱式碳酸钠铝的实验室研究。     

模糊分析方法在复相材料组织及性能设计上的应用

利用模糊分析的方法，确定了复相材料组织参量对性能的隶属函数．并运用模糊线性加权变换对４种不同组织参量的铁素体（Ｆ）－马氏体（Ｍ）双相钢的强度、塑性进行了评判与分析     

Agrobacterium-mediated transformation of herbicide resistance in creeping bentgrass and colonial bentgrass

Embryogenic calli were induced from the seeds of creeping bentgrass ( Agrostis palustris Huds. ) cv. Regent and colonial bentgrass ( Agrostis Tenuis Sibth. F1. Oxen. ) cv. Tiger. The embryogenic calli were precultured on fresh medium for 4-7 days and then co-cultivated with Agrobacterium tumefaciens, LBA4404,which contains plasmid vector-pSBGM harboring bar coding region, synthetic green fluorescent protein (sGFP) coding region and matrix attachment region (MAR) . After 3 days of co-cultivation, the calli were washed thoroughly and transferred to MS medium containing 2 mg/L of 2, 4-D, 12-15 mg/L phosphinothricin (PPT) and 250 mg/L of cefotaxime. After 2-3 months of selection, the actively growing calli of ‘Regent‘ and ‘Ti-ger‘ were transferred to MS medium with 12-15 mg/L PPT and 250 mg/L cefotaxime for regeneration. The putative transformants were maintained on MS medium with 3 mg/L PPT for long period but control died within 1 month. After establishing in greenhouse, the transformants also showed strong resistance to 0.4 % of herbi-cide Basta but control plants died within 2 weeks. Under confocal microscope, both young leaves and roots showed significant GFP expression. PCR analysis revealed the presence of a DNA fragment of GFP gene at the expected size (380 bp) in the transformants and its absence in a randomly selected control plant.     

关于高能核乳胶实验中的平均自由程问题

本文给出了在高能重离子与核乳胶相互作用中测定各种类型作用的平均自由程的一般方法和测定射弹碎片局域平均自由程的两种方法,并介绍了广义平均自由程等概念。     

没有增长限制条件的四阶非线性方程两点边值问题解的存在性

在没有增长限制条件下,本文证明了四阶非线性方程两点边值问题解的存在性,推广了文献[1][2]中的结果。     

木材含水率的测试方法

介绍了木材含水率的测试方法、工艺、自动控制的设计思想，给出了各部分的测量电路．     

DGN—2型气体监测仪

为了提高对毒气及有害气体监测的智能化，提高监测仪器的准确度，利用ＭＣＳ－５１系列单片机研制了精确度高的智能化监测仪．它具有体积小、重量轻、可靠性强等优点