刚体平面运动时瞬心两种轨迹间关系的一种证明

给出了刚体在平面平行运动时，刚体瞬心的本体极迹与空间极迹间关系的一种证明方法．     

同步辐射光源的尺寸、散射角和中心亮度计算

 同步辐射光源的尺寸、散角和中心亮度是装置的重要参数。着重讨论了同步光源的尺寸、散角和中心亮度的计算方法, 并给出了合肥同步辐射光源的结果。     

PuO2体系的分子反应动力学研究

基于ＰｕＯ２分子（Ｘ＾５Σｇ＾＋）的多体展式分析势能函数,用准经典的Ｍｏｎｔｅ－Ｃａｒｌｏ轨迹法研究了Ｏ（＾３Ｐｇ）＋ＰｕＯ（０,０）和Ｐｕ（＾７Ｆｇ）＋Ｏ２（０,０）的分子反应动力学过程。结果表明：Ｏ（＾３Ｐｇ）＋ＰｕＯ（０,０）碰撞生成少量稳定络合物ＰｕＯ２（Ｘ＾５Σｇ＾＋）,该反应是无阈能反应;而Ｐｕ（＾７Ｆｇ）＋Ｏ２（０,０）碰撞生成稳定络合物的同时,主要还发生了Ｐｕ（＾７Ｆｇ）＋Ｏ２（０     

Decay Time of 2.09 eV Luminescence of S2--Vacancy Centers and Their Optical and Thermal Stability in NaCl:S2 Crystals

An investigation was carried out on decay time of the 2.09 eV emission of S²–vacancy pair centers in NaCl crystals. When the crystal was excited by a pulsed 337 nm light from an N₂ laser, the 2.09 eV yellow luminescence principally decayed with the lifetime of 14.2 μs at low temperatures, and exhibited a weak thermal quenching with an activation energy of 51.3 meV above about 150 K. Such S^2--vacancy pair centers responsible for the 2.09 eV luminescence were thermally stable at room temperature, and not bleached even when exposed to ultraviolet lights below about 5 eV. Thus, the 2.09 eV emission center possibly can be used as a solid-state laser active center working at room temperature.     

量子微腔中原子大质心动量转移问题

讨论了双模量子环形微腔中二能级原子与腔场相互作用的动力学问题,分析了量子微腔的双模腔场和原子质心交换动量的过程。通过控制双模光场的光子数,得到了原子质心运动可同时吸收或发射多个光子的结论,从而可以实现较大的原子质心动量转移过程,使原子分束效应更为显著。     

五轴加工中心范成铣磨离轴非球面研究

离轴非球面作为非球面的一部分,是空间光学系统、天文学和高精度测量系统不可或缺的光学器件.针对空间光学对离轴非球面光学元件制造技术的重大需求,开展了离轴非球面反射镜的精密铣磨加工技术研究.分析了五轴联动范成法铣磨离轴非球面的原理,将离轴非球面所在的同轴母镜离散为一系列不同半径的球面环带,将工件坐标系建立在待加工离轴非球面...     

液态温度下Na:KCl晶体中F_B(Ⅱ)色心激光的实验研究

介绍了掺Na的KCl晶体中F_B(Ⅱ)心在液氮温度下的稳定激光运转.Q开关Nd:YAG激光的信频输出泵浦色心晶体.激光发射波长为2.420～2.542μm.对实验结果作了讨论.     

光学系统球心偏公差的优化制定方法

提出了一种简便、实用的制定光学系统球心偏公差的优化方法。     

Pitchfork bifurcation and circuit implementation of a novel Chen hyper-chaotic system

In this paper, a novel four dimensional hyper-chaotic system is coined based on the Chen system, which contains two quadratic terms and five system parameters. The proposed system can generate a hyper-chaotic attractor in wide parameters regions. By using the center manifold theorem and the local bifurcation theory, a pitchfork bifurcation is demonstrated to arise at the zero equilibrium point. Numerical analysis demonstrates that the hyper-chaotic system can generate complex dynamical behaviors, e.g., a direct transition from quasi-periodic behavior to hyper-chaotic behavior. Finally, an electronic circuit is designed to implement the hyper-chaotic system, the experimental results are consist with the numerical simulations, which verifies the existence of the hyper-chaotic attractor. Due to the complex dynamic behaviors, this new hyper-chaotic system is useful in the secure communication.     

红外序列图像中运动弱小目标检测

为检测红外序列图像中的运动弱小目标,分析了目标在序列图像中的运动特性和概率分布特性,以及目标和噪声在序列中的能量分布特性。提出连续M帧高阶累积方法来增强运动弱目标能量,用假设检验对目标和背景进行分割,通过搜寻序列运动能量中心来实现目标的多帧关联检测。通过仿真实验证明了算法对红外弱小目标检测有效性。