Mössbauer spectroscopy of an ordered phase (superstructure) of FeNi in an iron meteorite

Mössbauer and X-ray spectra for taenite lamellae from the iron meteorite Cape York show that the lamellae contain an ordered phase with the composition FeNi, and with the structure L10. This phase has not previously been detected in meteorites.     

Some properties of q-biorthogonal polynomials

Almost four decades ago, Konhauser introduced and studied a pair of biorthogonal polynomials

     

基于因子分析法的我国各省市公路网综合绩效评价

随着区域统筹的深化发展,公路在经济发展中承载着越来越重要的作用.公路网络建设不仅是决定地域经济发展的重要因素,甚至对区域经济发展也起着重要作用.在构建公路网综合绩效指标的基础上,运用因子分析法对全国各省市的公路网及其社会经济效应进行评价,通过横向比较分析各地公路的建设与使用情况,为各省市合理有效地规划公路建设提供决策依据,促进我国区域经济协调发展.     

Design of ring resonator based all optical switch for logic and arithmetic operations – A theoretical study

In this paper, a general analysis for non-linear micro-ring resonator as all optical switch is discussed in a vertically coupled GaAs–AlGaAs micro-ring resonator by carrier injection. The ring resonator is optically pumped, which results in temporal shift of resonant wavelength by refractive index change due to carrier injection. A green laser as optical pump beam is used to shift resonant wavelength 1.5 nm of the ring resonator. Simulation, analysis and overall transfer function of single ring as well as cascaded micro-ring resonator (MRR) is studied. A single circuit, consisting of three MRRs, capable to perform all the two input sixteen logic operations is studied and reported. The same circuit can also act as half adder/subtractor and single bit data comparator.     

本我、超我和自我的斗争——用弗洛伊德人格理论解释宋江形象的复杂性

对于《水浒传》中的宋江形象历来是众说纷纭。通过引入心理学中弗洛伊德的“人格理论”来分析宋江形象的复杂性,从本我、超我和自我三层人格在宋江身上的表现来解释宋江的行为,可为宋江形象研究指出另一个视角。     

高精度透热模型研究离子中的电子-离子-振动光谱

构建了一套完整的高精度数值模型, 成功地将透热理论应用于多原子分子体系(n≥5)的高分辨电子-振动光谱理论研究. 提出了在笛卡尔坐标系下处理分子体系中势能面圆锥交叉点位置简正振动模式的方法; 发展出递归算法处理任意高阶谐振子升降算符作用下的哈密顿矩阵元, 解决了量子力学变分法中利用谐振子基函数求解薛定谔方程涉及到高阶项时的数值计算困难.     

Three-dimensionally ordered composite electrode between LiMn2O4 and Li1.5Al0.5Ti1.5(PO4)3

A novel electrode system composed of three-dimensionally ordered macroporous (3DOM) Li_1.5Al_0.5Ti_1.5(PO₄)₃ (LATP) and LiMn₂O₄ was fabricated by the colloidal crystal templating method and sol–gel process. A LATP nanoparticle for the fabrication of 3DOM-LATP was prepared by a sol–gel process. A suspension containing polystyrene (PS) beads and the LATP nanoparticles was filtrated by using a polycarbonate filter to accumulate PS beads and LATP. The accumulated PS beads had a close-packing structure, and the void between PS beads was filled with LATP nanoparticles. 3DOM-LATP was obtained by heat treatment of the accumulated composite. Li–Mn–O sol was injected by a vacuum impregnation process into the macropores of 3DOM-LATP and then was heated to form three-dimensionally ordered composite materials consisting of LiMn₂O₄ and LATP. The formation of the composite between 3DOM-LATP and LiMn₂O₄ were confirmed with scanning electron microscopy and X-ray diffraction method. The prepared composite electrode system exhibited a good electrochemical performance. Paper presented at the 11th EuroConference on the Science and Technology of Ionics, Batz-sur-Mer, Sept. 9–15, 2007.     

基于非球面透镜的空间光场光纤耦合系统研究

针对全光纤激光雷达中空间光场与单模光纤的耦合问题,设计了基于非球面透镜的望远镜光纤耦合系统.利用ZEMAX软件以单模光纤耦合效率为优化目标对其结构参量进行优化设计,然后分别用LED和激光器作为光源进行初步实验,比较直接耦合和非球面透镜耦合效果.实验结果表明,采用非球面透镜耦合可使多模光源的耦合效率比直接耦合增加约47％,与仿真结果45％非常接近,且不同芯径耦合光功率之比大略等于芯径比平方;而该耦合方式可使单模光源的耦合效率增加约20％,且耦合进不同小芯径光纤的耦合效率之比约为其芯径比平方的2.4倍,这对构建全光纤转动喇曼激光雷达系统具有重要意义.     

Generation of all carbon quaternary stereocenters at the C-3 carbon of piperidinones and pyrrolidinones and its application in natural product total synthesis

Methodologies regarding the construction of an all carbon quaternary stereocenters at C-3 of lactams have posed significant challenges in the total synthesis of natural products. This review summarizes the advancements for the construction of an all carbon quaternary stereocenters at C-3 of piperidinones and pyrrolidinones and its application in the total synthesis of biologically active and architecturally complex alkaloids.     

全光纤声光调制器的耦合模理论研究

利用适于普通通信光纤的耦合模方程,从理论上分析了一种全光纤声光调制器.并从理论上研究了基于普通通信光纤的全光纤声光调制器,得到了这种全光纤调制器的输出结果.