内旋流流化床内颗粒运动规律的试验与数值研究

通过冷态试验与数值模拟研究了不同布风下装有∧字型布风板的内旋流流化床的流动特性，并进行了对比．气固两相数值模拟结果表明，固相流场产生了大尺度旋流，而且与试验观察到的现象相似．对固相颗粒速度分析表明非均匀布风使内旋流流化床的底部和顶部产生了气、固两相强烈的横向和纵向运动．相比较来说，对称的非均匀布风扩散能力要比均匀布风的扩散能力强．

Fluid-Solid Interaction in Particle-Laden Flows

Liu Qingquan, Singh V.P

Aberration measurement of projection optics in lithographic tools based on two-beam interference theory

The degradation of image quality caused by aberrations of projection optics in lithographic tools is a serious problem in optical lithography. We propose what we believe to be a novel technique for measuring aberrations of projection optics based on two-beam interference theory. By utilizing the partial coherent imaging theory, a novel model that accurately characterizes the relative image displacement of a fine grating pattern to a large pattern induced by aberrations is derived. Both even and odd aberrations are extracted independently from the relative image displacements of the printed patterns by two-beam interference imaging of the zeroth and positive first orders. The simulation results show that by using this technique we can measure the aberrations present in the lithographic tool with higher accuracy. (c) 2006 Optical Society of America.

Yb：铅锌镧碲酸盐玻璃的热学、光谱和激光性质

研究了摩尔组分为70TeO2-(20-x)ZnO-xPbO-5La2O3-2.5K2O-2．5Na2O(x=0，5，10，15，20)的新型多元铅锌镧碲酸盐激光玻璃，外掺Yb2O3为玻璃摩尔组分的1％，测试了试样的物理性质及吸收光谱、荧光光谱和荧光寿命，计算了Yb^3+的吸收截面、受激发射截面、荧光有效线宽等光谱参数，结果表明：该系列玻璃都具有良好的热学稳定性((Tx-Tg)>195℃，高于TZN玻璃(118℃))；当X=15时，样品具有较好的光谱性质：高的受激发射截面(1．25pm^2)、长的荧光寿命(

普罗托品在制备治疗老年性痴呆症药物中的应用

本发明属生物医学技术领域，具体地说，涉及普罗托品在制备治疗老年性痴呆症药物中的应用。本发明选用从滇产植物紫金龙中用现有技术提取的纯天然产物普罗托品，通过用普罗托品对小鼠记忆获得障碍、胆碱酯酶、小鼠神经细胞钠、钾和钙离子通道的影响的研究，表明普罗托品具有胆碱酯酶抑制作用和非选择性离子通道阻断作用，即具有胆碱酯酶抑制剂、吡咯烷酮类化合物和银杏叶提取物的优点，对老年性痴呆症等各种记忆障碍会有更好的治疗作用。普罗托品具有作为制备治疗老年性痴呆症等各种记忆障碍药物的用途。

Exploring factors shaping population genetic structure of the freshwater fish Sinocyclocheilus grahami (Teleostei, Cyprinidae)

Phylogeographical analyses on Sinocyclocheilus grahami samples from seven localities within the Lake Dianchi Basin in China were conducted to explore the main factors shaping population structure within this species. Phylogenetic and network analyses reve

改变捕光色素比例用于提高微藻光合效率

改变微藻的捕光色素系统比例被认为是提高其光合作用效率的有效途径,但对其基本原理尚不清楚.以空间飞行后分离的微藻突变株为材料,通过对其生长、光合放氧、色素比例、低温荧光发射和电子传递速率等的研究发现,微藻突变株的捕光色素比例改变引起的光能高效传递和利用,有可能是引起其光合作用效率提高及生长加快的原因.

汉江中下游春季浮游甲壳动物群落结构的空间差异

2002年4月,在汉江中下游从丹江口坝上至其河口沿途设17个采样点,共采集到浮游甲壳动物10科26属33种,其中桡足类4科10属11种,枝角类6科16属22种。根据各采样点的种类组成和数量分布,采用Shannon Wiener指数、Simpson指数和Pielou均匀度指数分析了不同江段浮游甲壳动物的群落多样性特征,并运用SOM人工神经网络方法对其群落结构的空间差异进行了比较。结果表明,汉江中下游江段浮游甲壳动物的密度分布呈现出中游高于下游的特征,而物种丰度和群落多样性指数则是下游高于中游;中游上段的属于

Optical bistability in InP/GaInAsP equilateral-triangle-resonator microlasers

Optical bistability is reported in InP/GaInAsP equilateral-triangle-resonator (ETR) microlasers, which are fabricated by planar technology. For a 30 mu m side ETR microlaser with a 2-mu m-wide output waveguide connected to one of the vertices of the ETR, hysteresis loops are observed for the output power versus the injection current from 215 to 235 K. The laser output spectra are measured in the upper and lower states of the hysteresis loop, which show strong mode competition among transverse modes. The hysteresis loops are demonstrated by two-mode rate equations with asymmetric cross gain saturation and different output efficiencies. (C) 2009 Optical Society of America

Controlled growth of III-V compound semiconductor nano-structures and their application in quantum-devices

This paper reviews our work on controlled growth of self-assembled semiconductor nanostructures, and their application in light-emission devices. High-power, long-life quantum dots (QD) lasers emitting at similar to 1 mu m, red-emitting QD lasers, and long-wavelength QD lasers on GaAs substrates have successfully been achieved by optimizing the growth conditions of QDs.

High-power and low-threshold-current-density GaAs/AlGaAs quantum cascade lasers

We report on the realization of GaAs/AlGaAs quantum cascade lasers with an emission wavelength of 9.1 mu m above the liquid nitrogen temperature. With optimal current injection window and ridge width of 24 and 60 mu m respectively, a peak output power more than 500 mW is achieved in pulsed mode operation. A low threshold current density J(th) = 2.6 kA/cm(2) gives the devices good lasing characteristics. In a drive frequency of 1 kHz, the laser operates up to 20% duty cycle.

Quantum-well anisotropic forbidden transitions induced by a common-atom interface potential

A prominent effect of the interface potential (IP) [E. L. Ivchenko and A. Yu. Kaminski, Phys. Rev. B 54, 5852 (1996); O. Krebs and P. Voisin, Phys. Rev. Lett. 77, 1829 (1996)], the optical anisotropy of the forbidden transitions in quantum wells has been observed by reflectance-difference spectroscopy. Predictions by the heavy-light-hole coupling IP models are qualitatively consistent with all the observed features of the forbidden and the allowed transitions. The fact that the predicted value of the relative, transition strength, which depends on neither the IP strength nor the electric field, disagrees with the observed one indicates that coupling involving X and/or L bands may also be important. [S0163-1829(99)04227-7].