推广的Painlevé展开及KdV方程的非标准截断解

利用奇性流形的任意性，选用不同的展开函数及非标准截断展开于KdV方程，得到了许多用复杂隐函数表示的精确解. 关键词：     

导数光谱法测定污水中十二烷基苯磺酸钠

本文介绍了用导数分光光度法直接定量分析污水中十二烷基苯磺酸钠的方法。本法消除了混浊背景干扰，操作简便快速。应用于实际污水样品的分析，获得了良好的结果，十二烷基苯磺酸钠的校准曲线线性范围为0－82mg/L。     

Generation of 2－10ns Excimer Laser Pulse by Optical Synchronizing Wave－clipping

Ｇｅｎｅｒａｔｉｏｎｏｆ２－１０ｎｓＥｘｃｉｍｅｒＬａｓｅｒＰｕｌｓｅｂｙＯｐｔｉｃａｌＳｙｎｃｈｒｏｎｉｚｉｎｇＷａｖｅ－ｃｌｉｐｐｉｎｇＸＩＡＮＧＳｈｉｑｉｎｇ；ＬＯＵＱｉｈｏｎｇ；ＤＯＮＧＪｉｎｇｘｉｎｇ；ＭＡＮＧＹａｎｐｉｎｇ；ＷＥＩＹｕｎｒ...     

自适应零限波束形成语音增强算法鲁棒性分析

分析了双传声器自适应零限波束形成语音增强算法对传声器不一致和本底噪声的鲁棒性。结果表明:信干比越高,算法对传声器不一致的鲁棒性越差;当信干比很低时,算法对相位不一致是鲁棒的。幅度不一致会降低算法对干扰的抑制能力,但引起的目标信号失真很小。相对于传声器不一致,本底噪声对算法性能的影响较小。对自适应滤波器权值加约束和对传声器做校准可以提高算法性能。     

Spin asymmetry and s-electron itinerancy in Co/X (X=Co,Cu, V and Ta) multilayers: their dependence on the electronegativity of non-magnetic layers

The electronic structure and magnetic properties of the Co at the Co/X (X=Co, Cu, V and Ta) interfaces have been studied by first-principle discrete variational method. We have found that the spin asymmetry and the s-electron itinerancy of the Co interface layer in the Co/X systems are strongly dependent on the electronegativity of the non-magnetic layers. A large difference in the electronegativity between the non-magnetic and Co layers is unfavorable both for s-electron itinerancy and for the spin exchange split of DOS at the Fermi level. Further study on charge density has revealed that a bond is formed across the Co/V and Co/Ta interfaces.     

喷雾热解法制备的SrWO4膜的阴极射线发光

利用超声喷雾热解法制备了钨酸锶SrWO₄多晶发光膜,并研究了制备条件及掺杂对其阴极射线发光特性的影响.生成的发光膜在300℃以上退火后具有白钨矿结构,其阴极射线发光为一宽带的蓝光,包括一个位于448nm的蓝色发光带和一个位于488.6nm的蓝绿色发光带,是由阴离子络合物WO₄^2-的电荷转移跃迁引起的.发光强度随着退火温度的升高而增强,而退火气氛对其影响不大.在SrWO₄膜中掺入银离子Ag⁺和镧离子La³⁺后,不影响其发光特性,但铕离子Eu³⁺的掺入对发光特性有影响.     

Surface luminescence in ZnO nanoparticles

Spectral and time-resolved photoluminescence (TRPL) measurements were performed on ZnO nanoparticles of different sizes (17-300 nm). Under a low photon energy excitation of 2.33 eV, the time-integrated PL spectra (TIPL) clearly exhibit broad emission in the range of 1.2-2.3 eV. Upon increase of the particle size, a red-shift in the PL peak position was observed. Gaussian analysis indicates that this red-shift corresponds to the increased relative magnitude of the Gaussian combination in the low energy region. In addition, TRPL demonstrates a clear relationship between the particle diameters and the PL decay times. The shortening of the PL lifetime could be explained by a surface states model.     

Single-Proton Pickup Reaction of the Halo Nucleus ^6He on a ^9Be Target at 25 MeV/nucleon

The inclusive differential cross sections of the ^7 Li nucleus in a reaction induced by ^6He on a ^9Be target are measured at an incident energy of 25 MeV/nucleon. Finite-range distorted-wave Born approximation calculations suggest that these ^7 Li particles are formed in a direct single-proton pickup reaction ^9Be（^6He,^7 Li）^8Li. The experimental data can be well reproduced by taking into account of the contributions of both the ground states and the first excited states of ^7Li and ^8Li.     

Study of the Electrical Double Layer of a Spherical Micelle: Functional Theoretical Approach

The electrical double layer theory is the base of the colloid stability theory (DLVO theory), and the PB eq. is a key to the study of the layer1,2. For a spherical particle, the PB eq. is (1) where and are the dielectric constant of the medium, the valence of ions, the elementary charge, the concentration of ions far away from the particle, the Boltzmann's constant and the temperature of the system, respectively. Since this eq. is a second order nonlinear differential one, only the anal…