液芯波导中受激动力学散射与受激拉曼散射的竞争

研究了液芯波导中受激拉曼散射和受激动力学散射的阈值随泵浦激光脉宽的变化，发现受激动力学散射的阈值随泵浦脉冲前沿增长率增大而下降。研究了受激动力学散射和受激拉曼散射的竞争，结果表明受激动力学散射可分解为两种成分，其中与瞬态泵浦功率密度增长率相关的成分在大于阈值的泵浦脉冲前沿处于竞争优势，与瞬态泵浦功率密度相关的成分在高泵浦功率密度处于竞争优势，并讨论了其相应的机制。     

Generation of the numerator=2 rational harmonic mode-locked pulses in fiber ring lasers

In conventional rational harmonic mode-locking, optical pulse trains with the repetition rate of (pn+1)f_c are generated when the modulation frequency of the in-cavity modulator is set at f_m = (n+1/p)f_c, where n and p are both integers, f_c is the fundamental cavity frequency. In this paper, we report that rational harmonic mode locking phenomenon takes place in the fiber lasers when the modulation frequency is set at f_m =(n+2/p)f_c. The pulse generations are experimentally demonstrated when the numerator of the rational corresponds to 2 in 5th and 7th order rational harmonic mode-locking.     

用Applet在网页上实现动态水中倒影

介绍了用Java Applet程序在网页上制作静态图片的水中倒影的总体实现方案，详细说明了其中涉及的主要技术和方法，也提出了有待解决的几个问题。     

磷砷化镓黄色发光二极管

采用掺氨砷压法在磷化镓衬底上外延生长掺碲n型的GaAs0.15P0.85:N/GaP材料,制成磷砷化镓黄色发光二极管,测量了其光学和电学性能.讨论了影响器件发光效率的因素.     

《大学物理》多媒体教学实践点滴

本文总结了在基础物理课程中实施多媒体教学改革的情况，对教师和学生进行了广泛调查，调查结果表明，多媒体教学方式有利于增强课堂效果和提高教学质量。     

单镜Cu/CuBr激光器放大自发辐射光脉冲的弛予振荡

本文首次报道了单镜Cu/CuBr激光器的放大自发辐射光脉冲具有弛予振荡,得出弛予振荡的实验观律。此外,还探测到这种放大的自发辐射光脉冲光强的时空分布比较均匀,其空间相干性优于同一种工作物质的激光辐射。     

CYTOCHEMICAL STUDY OF ELECTRON MICROSCOPY ON FRUCTOSE 1,6-DIPHOSPHATASE AND URIDINE DIPHOSPHOGLUCOSE PYROPHOS PHORYLASE IN THE MESO PHYLL CELLS OF Stevia rebaudiana BERTONI

The subcellular localizations of fructose 1,6-diphosphatase (FDPase, EC 3.1.3.11) and uridine diphos-phoglucose pyrophosphorylase (UDPG PPlase, UTP:α-D-glucose-I-phosphate uridylytransferase, EC 2.7.7.9) in the mesophyll cells of a new sweetener plant (Stevia rebaudiana Bertoni), both of which arecritical in carbohydrate metabolism, were determined and the activities of both enzymes in the leaves ofdifferent ages were compared in this study. This experiment reveals: FDPase is a membrane-bound enzymeand is specifically localized on the thylakoid membranes of chloroplasts and the plasmic membranes.FDPase is only found on the thylakoid membranes of chloroplasts in the young mesophyll cells, while it isfound on both the thylakoid membranes of chloroplasts and the plasmic membranes in the mature meso-phyll cells. UDPG PPlase is distributed in the cytoplasmic matrix freely, and is localized on Golgi flat-tened sacs and Colgi vesicles in a membrane-bound form. In this study, it is suggested that the chloropla     

微生物降解体系中反-4-甲基-环己烷酸的气相色谱-质谱法测定

建立了微生物降解体系中反-4-甲基-环己烷酸(4MCCA)的气相色谱-质谱测定方法。分别采用孔径为0.45和0.22μm滤膜对微生物降解体系中的4MCCA样品进行减压过滤,去除菌体;用0.1 mol/L H2SO4调节滤液至pH 2～3;二氯甲烷萃取定容。利用气相色谱-质谱的选择离子模式检测,外标法定量。本方法的线性范围为0.10～100 mg/L,相关系数为0.9994,检出限和定量限分别为0.10 ng和0.34 ng,日内和日间精密度分别为2.7%～6.6%和1.5%～11.3%。采用本方法测定了150 mg/L 4MCCA在微生物降解体系中的降解情况,24,48和96 h时4MCCA的降解率分别为24.7%,51.8%和55.0%。