飞秒激光参数对三态阶跃型分子Autler-Townes分裂的影响

利用三态模型和含时波包法, 研究了K₂分子在强飞秒泵浦-探测激光场中泵浦/探测场强、波长对光电子能谱Autler-Townes(AT)分裂的影响．通过分别改变两激光场的场强或者波长预测AT峰移和间距,并且首次量化了AT分裂的峰移和间距．光电子能谱在共振时显示为对称双峰,失谐时为非对称双峰。AT分裂间距随泵浦场强增大而增大,但不因探测场强改变而改变．     

基于光腔衰荡光谱的宽范围水汽探测

介绍基于光腔衰荡光谱技术的光学湿度测量装置．该装置具有高真空兼容性,衰荡腔由低膨胀的殷钢制成,并利用其自身的自由光谱范围实现光谱的自标定．使用单个在1.39 μm的半导体激光器,实 现了从真空、高纯氦气中痕量水汽,一直到大气湿度的测量,可测量的水汽分压范围极大：0.1 μPa～1 kPa．该光学湿度计可用于作为基本水汽标准,以及测定低温下水(冰)的蒸气压．     

SOI环形光波导谐振腔双层石墨烯调制器（英文）

在片上光互连系统中,电光调制器起到将电信号调制为光信号的作用,是光互联系统中的核心部件之一。调制器的3dB带宽决定着载波所能携带的最大信息量,是衡量调制器性能的核心参数。利用石墨烯和高Q环形谐振腔设计成具有CMOS结构的新型调制器,其集成了石墨烯的宽带吸收、载流子迁移率高等材料优势和高Q值环形光学谐振腔的光程放大的结构优势,通过理论计算,其3dB调制带宽可以达到100GHz。同时,基于微环谐振腔的石墨烯电光调制器结构可以方便的与光互联系统中的波分复用器相集成,从而提升片上光互联系统的集成度和降低技术复杂性。     

表面活性剂辅助二氧化硅纳米颗粒在非水基液中的分散研究（英文）

研究了粒径10~100nm的二氧化硅纳米颗粒在非水基液中的表面活性剂辅助分散。结合颗粒表面特定官能团结构,针对性选择了合适的表面活性剂,氢键桥梁作用和长链分子空间位阻作用抑制了颗粒团聚行为。当表面活性剂体积分数6%的时候,动态光散射测试结果表明颗粒中位尺度30.2nm,与透射电镜测试结果吻合,展现了良好的分散性。     

非晶碳氧化硅纳米线的合成与光致发光

利用直流电弧放电合成非晶碳氧化硅(SiCO)纳米线,不使用催化剂和模板,独立的SiCO 纳米线沉积在石墨锅的表面．通过XRD、SEM、TEM、XPS、FTIR等对SiCO纳米线进行了表征．结果表明,纳米线长度为20～100 μm,直径为10～100 nm,Si原子同C原子和氧原子分享成键组成SiCO单元．SiCO纳米线的光致发光谱在454和540 nm呈现了强而稳定的白色发光峰． SiCO纳米线的生长机制为等离子辅助气―固生长机制．     

傅里叶变换红外光谱仪中动镜系统的设计

为提升傅里叶变换红外光谱仪的整体性能,基于立体角镜与平面镜组合的光学结构,设计了一种柔性支撑机构的摆动型动镜机构.建立和分析该机构控制模型,设计了相适应的反馈控制算法.结果表明:该结构具有无摩擦、抗震性好等优点;光学结构能够很好地补偿动镜摆动造成的倾斜与横移误差,保证仪器的重复性与稳定性;通过对控制算法参量的调整,动镜机构的扫描准确度优于98.4%.在4cm-1的光谱分辨率条件下,使用该动镜机构所测得的红外光谱信噪比优于80000:1,能够满足高准确度定量分析的要求.     

A new orthogonal evolutionary algorithm based on decomposition for multi-objective optimization

The diversity of solutions is very important for multi-objective evolutionary algorithms to deal with multi-objective optimization problems (MOPs). In order to achieve the goal, a new orthogonal evolutionary algorithm based on objective space decomposition (OEA/D) is proposed in this paper. To be specific, the objective space of an MOP is firstly decomposed into a set of sub-regions via a set of direction vectors, and OEA/D maintains the diversity of solutions by making each sub-region have a solution to the maximum extent. Also, the quantization orthogonal crossover (QOX) is used to enhance the search ability of OEA/D. Experimental studies have been conducted to compare this proposed algorithm with classic MOEA/D, NSGAII, NICA and D2MOPSO. Simulation results on six multi-objective benchmark functions show that the proposed algorithm is able to obtain better diversity and more evenly distributed Pareto fronts than other four algorithms.     

Singly Periodic Solutions of the Allen-Cahn Equation and the Toda Lattice

The Allen-Cahn equation ? Δu = u ? u ³ in ?² has family of trivial singly periodic solutions that come from the one dimensional periodic solutions of the problem ?u″ =u ? u ³. In this paper we construct a non-trivial family of singly periodic solutions to the Allen-Cahn equation. Our construction relies on the connection between this equation and the infinite Toda lattice. We show that for each one-soliton solution to the infinite Toda lattice we can find a singly periodic solution to the Allen-Cahn equation, such that its level set is close to the scaled one-soliton. The solutions we construct are analogues of the family of Riemann minimal surfaces in ?³.     

Numerical solution of one‐dimensional Burgers' equation

In this article, an iterative method for the approximate solution of a class of Burgers' equation is obtained in reproducing kernel space . It is proved the approximation converges uniformly to the exact solution u(x, t) for any initial function under trivial conditions, the derivatives of are also convergent to the derivatives of u(x, t), and the approximate solution is the best approximation under the system © 2014 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 31: 1251–1264, 2015