Wavelength-mode pulse interleaver on the silicon photonics platform

We report an 8-channel wavelength-mode optical pulse interleaver on a silicon photonic chip.Wavelength-and mode-division multiplexing techniques are combined to increase the repetition rate of the pulses without adding the complexity of a single dimension.The interleaver uses a cascaded Mach–Zehnder interferometer architecture as a wavelength-division(de)multiplexer,an asymmetric directional coupler as a mode(de)multiplexer,and various lengths of silicon waveguides as delay lines.A pulse sequence with a time interval of 125 ps is implemented with the repetition rate being eight times that of the initial one.The demonstrated wavelength-mode multiplexing approach opens a new route for the generation of high-speed optical pulses.     

荧光小分子在有机薄膜中的固定化及其应用

将荧光小分子化学固定于基质表面是实现表面功能化的有效途径,是研究固体基质表界面性质的有效方法,也为设计制备荧光传感薄膜材料提供了新的思路。本文按高分子膜固定法、LB膜固定法和自组装膜固定法分类综述了荧光小分子在固体基质表面的固定化。讨论了膜表面固定化荧光小分子在表界面性质研究、阳离子和中性分子的化学传感以及表界面电子转移和能量转移研究等方面的应用,并对新的固定化方法进行了展望。     

Curvilinear Poincaré vector beams

We develop a method for completely shaping optical vector beams with controllable amplitude, phase, and polarization gradients along three-dimensional freestyle trajectories. We design theoretically and demonstrate experimentally curvilinear Poincaré vector beams that exhibit high intensity gradients and accurate state of polarization prescribed along the beam trajectory.     

联立薛定谔方程的不传播光孤子和传播光孤子

映射法是一种非常经典、有效而且非常成熟的一种求解非线性演化方程的方法,其最大的特点是可以有无穷多个不同形式的设解,使得最终求得的解丰富多彩。传统的方法是在行波约化的前提下,即在常微分方程下进行映射。将这种方法进行扩展,推广成变系数的非行波约化下的映射,取得了成功,并利用改进的里卡蒂(Riccati)方程映射法,得到了联立薛定谔方程(负KdV方程)新的精确解。根据所得到的解模拟出了联立薛定谔方程的不传播光孤子(时间光孤子和亮-暗脉冲光孤子)和传播光孤子,以及光孤子的中和现象。     

线性分式规划优化分析的元模型方法

1引言线性分式规划(LFP): min f(x)=(p~Tx α)/(q~Tx β) s.t. Ax=b (1) x≥0有着重要的应用背景,特别在经济管理中受到广泛关注．例如,以净收益率为优化目标函数的海洋运输问题;当价格系数为随机变量时,优化目标为获得满意的收益水平概率最大的资源分配问题等[11]．线性分式规划是一类特殊的非线性规划,除一般的非线性规划求解方法外,它还有一些特殊的专用算法．这里,我们要考虑的问题是;当右端资源约束向量在一定范围内(即L≤b≤U,L,U分别为b的下界和上界)变化时,目标函数的最优值如何变化?我们把这一问题称之为线性分式规划的优化分析．     

组合化学的研究进展

综述了组合化学的起源、发展历史及原理;介绍了化合物库建立的基本方法;同时重点阐述了组合化学的研究进展及其在药物、催化剂、材料等领域中的应用情况,并对组合化学的发展做出展望。     

COMPUTATION OF FLEXURAL PROPERTIES OF HA/PLLA COMPOSITE USING A CELL MODEL APPROACH

A three-dimensional finite element analysis was conducted to evaluate the feasibility of predicting the flexural properties of hydroxyapatite-reinforced poly-L-lactide acid (HA/PLLA) biocomposite using three different schemes. The scheme 1, originated from a beam analysis, was used to determine the flexural modulus analytically while the scheme 2 and 3 were designed to have different loading and boundary conditions using a finite element cell modeling approach. An empirical approach using Chow's formula and experimental data were used for comparison with the predicted results. In order to reduce the computational time and save the storage space involved in determining the effect of varying particle volume fractions on the flexural properties of HA/PLLA, a superelement technique was applied. The results using the scheme 3 and the Chow's formula were found to be in reasonable agreement with experimental results over the range of particle volume fraction. In addition to the Chow's formula, local stress distribution and the failure processes in HA/PLLA were simulated using the finite element technique.     

MULTI-FIELD COUPLING BEHAVIOR OF SIMPLY-SUPPORTED CONDUCTIVE PLATE UNDER THE CONDITION OF A TRANSVERSE STRONG IMPULSIVE MAGNETIC FIELD

In order to study the multi-field coupling mechanical behavior of the simply-supported conductive rectangular thin plate under the condition of an externally lateral strong impulsive magnetic field, that is the dynamic buckling phenomenon of the thin plates in the effect of the magnetic volume forces produced by the interaction between the eddy current and the magnetic fields, a FEM analysis program is developed to characterize the phenomena of magnetuelastic buckling and instability of the plates. The critical values of magnetic field for the three different initial vibrating modes are obtained, with a detailed discussion made on the effects of the length-thickness ratio a/h of the plate and the length-width ratio a/b as well as the impulse parameterτon the critical value BOcr of the applied magnetic field.     

硬质聚氨酯泡沫塑料动态力学性能的研究

介绍了用分离式Ｈｏｐｋｉｎｓｏｎ压杆对硬质聚氨酯泡沫塑料（ＲＰＵＦ）进行的一种高应变率实验，第一次完整地给出了ＲＰＵＦ在１０￣３ｓ￣（－１）高应变率下的动态应力应变曲线，并对ＲＰＵＦ的动态力学性能及其吸能缓冲机理作了简单的分析。     

基于技术进步的经济增长因素分析

本文考虑技术进步的生产函数以及在规模收益可变的条件下,利用我国的年度数据对其进行了估计和检验;得到的结果区别于其他文献的结果:资本和劳动的投入是目前我国经济增长的主要动力并且规模报酬是递增的,技术进步对经济增长的影响很小并且是相反的.