光纤-氮系统的受激拉曼散射

在实验上,对三种不同长度的石英光纤进行了高温高压扩氮制成了光纤氮拉曼增益介质,给出了测试SRS光谱的实验装置、光谱及传输模式照片.在理论上和实验上讨论了阈值条件和谱线宽度与抽运光功率之间的关系,实验结果和理论计算基本符合.同时,在实验上还观测到微弱的氮分子和石英分子间的耦合模式. 关键词： 光纤-氮系统 受激拉曼散射 传输模式 阈值条件     

数理统计在泡桐缘材营造技术上的应用

本文针对泡桐育椽存在的问题，应用正交试验，多重比较，方差分析等方法进行泡桐椽材营造技术研究，找出适合椽材林生长的优化组合和最佳育椽模式，经运行取得了较高的经济效益。     

北京τ–c工厂(BTCF)快速蒙特卡罗模拟方法的开发和应用

参考国内外现有的τ-c工厂及其探测器的设计结果,给出了BTCF探测器的总体指标. 根据这些指标设计并开发了用于BTCF物理研究的快速蒙特卡罗模拟方法,并用此方法对一系列重要的物理课题进行了蒙特卡罗模拟. 文中描述了该模拟方法的设计思想、程序流程以及这种方法在BTCF可行性研究乃至预制研究阶段的优越性,同时也给出了对若干重要物理问题的模拟结果. 从而论证了建造BTCF的必要性和不可替代性.     

Phonon Dispersion in Ca70Mg30 Metallic Glass

The phonon dispersion curves （PDC） of Ca70Mg30 metallic glass has been studied at room temperature in terms of phonon eigen frequencies of longitudinal and transverse modes employing three different approaches proposed by Hubbard and Beeby （J. Phys. C： Solid State Phys. 13 （1969） 556）, Takeno and Goda （Prog. Theor. Phys. 45 （1971） 331; 47 （1972） 790） and Bhatia and Singh （Phys. Rev. B 31 （1985） 4751）. The well recognized model potential of Gajjar et al. is employed successfully to explain electron-ion interaction in the metallic glass. The effective pair potential is used to generate the pair correlation function g（r）. The local field correction function （Int. J. Mod. Phys. B 17 （2003） 6001） is used for the first time to introduce the exchange and correlation effects on the aforesaid properties. The present findings of PDCs are found to be in agreement with the available theoretical as well as experimental data. The thermodynamic and elastic properties, i.e. longitudinal and transverse sound velocities, isothermal bulk modulus, modulus of rigidity, Poisson＇s ratio, Young＇s modulus and Debye temperature, are also investigated successfully.     

Bagging算法在混合适应性样条中的应用

本文通过分析Bagging算法在混合适应性样条估计中的作用，提出了一种新的空间适应性非参数函数估计算法．模拟研究表明该算法在空间适应性上具有明显优势，在估计精度和稳定性方面也可与其他同类方法相媲美，并且易于推广到多元情形．     

Statistical Characterization of Boundary Fluctuations in the HT—7 Tokamak

The statistical properties of plasma fluctuations are characterized in the boundary region of HT-7 tokamak. A non-Gaussian feature is observed in fluctuations of ion saturation current and floating potential in most of the scrape-off layer regions. The statistical properties of fluctuations have a clear radial dependence, showing a near-Gaussian character in the proximity of the velocity shear layer location and another region where the poloidal velocity has a trend to zero. Fluctuations show a bursty character with pulses asymmetric in time and the time asymmetry reaches the minimum around the shear layer. From the results, we can see an obvious coupling of the pulses and the poloidal flow.     

NANOPARTICLE DESIGN AND HANDLING——CHALLENGES FOR ENGINEERS AND PARTICLE TECHNOLOGISTS

In this paper, the opportunities and challenges which future applications based on nanoparticles offer to engineers are described. New high-added value products induce us to rethink ways to control nanoparticle design and handling. Several challenges are described and typical solutions are given: (1) finding relevant engineering tasks outside traditional process industry; (2) the importance of mixing reactants; (3) obtaining monodisperse particles; (4) gaining efficient control via electric forces and (5) developing multi-step processes which allow more control over particle properties.     

等束宽超短脉冲光束的远场特性

利用角谱法和复解析信号法推导出了等束宽超短高斯脉冲光束在远场的解析传输公式及其傅里叶谱.研究了若干个甚至一个光周期数的等束宽超短高斯脉冲光束的远场特性，并与等衍射长度超短高斯脉冲光束作了比较.研究表明，等束宽超短高斯脉冲光束在远场存在脉冲展宽、光谱变窄、离轴光谱红移、轴上光谱蓝移等特性. 关键词： 角谱法 复解析信号法 等束宽超短高斯脉冲光束     

不同分布混合序列的强收敛速度

讨论了(～ρ)混合序列的强收敛性,获得了与独立情形几乎一致的结果,推广了著名的Marcinkiewicz-Zygmund强大数律.