抛物阱中极化子效应对D-心的影响

采用改进的LLP方法在考虑体声子影响的情况下研究了抛物量子阱中电子-LO声子相互作用对D^-心能量的影响.研究结果表明,阱宽较小时,D^-心的基态能量和结合能随着阱宽L的增大而急剧减小;阱宽较大时,能量的减小比较缓慢,最后接近体材料中的三维值.并且得出了电子-LO声子相互作用可使D^-心的结合能有显著的提高.     

液体闪烁体衰减长度和光产额的测量

简要介绍了用于反应堆中微子实验的液体闪烁体的成分, 描述了液闪衰减长度和光产额的测量原理、方法、装置及过程, 给出了不同配比的液闪的光产额和衰减长度的测量结果, 并对液闪光产额和衰减长度的性能及影响因素进行了研究. 测量结果表明, 这些液闪可以满足中微子实验的需求.     

Geometry Parameter Optimization of Large Cross-Sectional S-Shaped Bent Rib Waveguides for Silicon Based Optical Switches

By using a genetic algorithm, geometry parameters of large cross-sectional S-bend rib waveguides are optimized aiming at the least total loss when the propagation loss is considered. Optimized results axe presented as an example of S-bend rib waveguides based on silicon-on-insulator （SOI） 4 × 4 optical switches. The value of 2 dB/cm is given to the propagation loss according to the experimental results. The simulation results indicate that the total loss drops from 1.0002rib down to 0.4375dB without considering a lateral offset. If the offset is adopted, the total loss reduces from 0.5463dB to 0.2365dB. In addition, the effect of the rib height ratio on the loss is analysed, and the optimal ratio is obtained to be 0.55.     

Evolution of Voronoi/Delaunay Characterized Micro Structure with Transition from Loose to Dense Sphere Packing

Micro structures of equal sphere packing （ranging from loose to dense packing） generated numerically by discrete element method under different vibration conditions are characterized using Voronoi/Delaunay tessellation, which is applied on a wide range of packing densities. The analysis on micro properties such as the total perimeter, surface area, and the face number distribution of each Voronoi polyhedron, and the pore size distribution in each Voronoi/Delaunay subunit is systematically carried out. The results show that with the increasing density of sphere packing, the Voronoi//Delaunay pore size distribution is narrowed. That indicates large pores to be gradually substituted by small uniformed ones during densification. Meanwhile, the distributions of face number, total per/meter, and surface area of Voronoi polyhedra at high packing densities tend to be narrower and higher, which is in good agreement with those in random loose packing.     

多模光场与二能级原子相互作用的纠缠交换与保持

利用全量子理论，研究了M个二能级原子分别与M个多模光场依赖于强度耦合的相互作用过程.结果表明，控制原子穿越腔场的时间，能够实现量子纠缠信息的传递与保持，即t₁=π/(2λ)时，原子和腔场中的纠缠态可以相互交换，其结果利用数值计算原子纠缠度得以证明；当t₂=π/λ时，原子和腔场中的纠缠态可以各自保持.     

Quantum Tunneling of Spinor Bose–Einstein Condensates in an Optical Lattice

We have studied tunneling of spinor Bose–Einstein condensate in an optical lattice. It is found that, when the system being prepared in a squeezed coherent state, there exist the quantum tunneling between lattices l and l+1, l and l−1, respectively. In particular, when the optical lattice is infinitely long and the spin excitations are in the long-wavelength limit, quantum tunneling disappear between lattices l and l+1, and that l and l−1, in this case the magnetic soliton appears.     

高性能新型中频节能电源技术探讨

本文论述了IGBT技术特性及技术规格并对国内外现状进行了分析，提出了IGBT在节能方面的优势。     

PRI变换对脉冲雷达信号PRI检测的性能分析

传统的雷达脉冲列去交错算法很容易出现信号的脉冲重复间隔及其整数倍(即子谐波)同时存在的现象,给雷达脉冲串的去交错造成了困难。介绍了PR I变换的脉冲重复间隔估计算法,该算法几乎完全抑制了出现在自相关函数中的子谐波,同时研究了该算法对稳定重频、抖动重频、参差重频、滑变重频等各类信号的PR I检测性能。计算机仿真结果表明,这种算法适用性较强。     

一种四通道AGC中频放大组件的设计研制

介绍了一种四通道中频放大组件的设计研制。其输入频率为(70±12)MHz,工作温度为-40~ 70℃时,四通道输出幅度一致性≤1 dB;动态范围≥70 dB;输出电平(Vpp)为1~1.5 V;输出电平波动(动态范围内)≤1 dB。     

Zitterbewegung in quantum field theory

Traditionally, the zitterbewegung （ZB） of the Dirac electron has just been studied at the level of quantum mechanics. Seeing the fact that an old interest in ZB has recently been rekindled by the investigations on spintronic, graphene, and superconducting systems, etc., this paper presents a quantum-field-theory investigation on ZB and obtains the conclusion that, the ZB of an electron arises from the influence of virtual electron-positron pairs （or vacuum fluctuations） on the electron.