超导体与磁体间的三维磁力及磁场测试装置研制

本文研制的三维磁力测试夹具和三维霍耳探头,可以实现:1)直接测量出磁体与磁体、磁体与超导体等之间的三维磁力随两者之间相对位置的变化规律;2)直接测量出任何磁体或组合磁体在空间的三维磁场分布;3)通过将三个三维霍尔探头或九个单独的霍尔探头分别按研究内容的需要固定在所要研究的空间区域,再改变磁体与磁体之间、或磁体与超导体等之间的相对位置,从而在测量出它们之间的相互作用力的同时,测量出由于它们之间因相对位置改变而引起的动态磁场分布变化;还可以得到磁体接近超导体时磁场进入超导体的动态变化规律等.该套测试装置,将工作效率提高到原来的300%以上.这对研究磁性材料的宏观磁性质具有非常重要的意义.     

两共轴平行圆环电流之间的电磁作用力

利用纽曼公式,并引人一个数学关系式,计算出两共轴平行圆环电流的互感,通过求其微分,给出了其相互作用力的解析表达式,并通过数值计算和作图,讨论了相互作用力与两圆环半径、圆心距离的关系及其极值点的意义,得到了一个关于两共轴圆环电流之间的电磁作用力的具体、形象和直观的物理图景．     

定量脉冲产生电路

采用CMOS数字集成电路设计了特殊的脉冲电路，该电路能够根据设定输出指定数目的脉冲。     

Ni、Co/AAO纳米有序阵列复合结构光吸收特性的比较研究

在多孔阳极氧化铝(AAO)模板中分别沉积金属镍(Ni)、钴(Co),制备了Ni／AAO和Co／AAO纳米有序阵列复合结构,对其光吸收特性进行了比较研究。实验结果表明．相同结构参量的模板中,Ni、Co纳米粒子的表观形状随沉积时间的变化规律基本一致．但Co/AAO及Ni／AAO复合结构的光吸收特性却有较大差异。Ni／AAO复合结构表现出间接带隙半导体的光学特征．而Co／AAO复合结构具有直接带隙半导体的光学特征。同时,随金属沉积量的增加,Ni／AAO吸收边的红移量仅约为13nm．而Co/AAO复合结构的吸收边红移量却超过了80nm。用Maxwell-Garnett(M-G)理论分析了导致二者光吸收特性存在较大差异的主要原因。     

简述科里奥利加速度

  参照现有大学物理层次的科里奥利加速度的各种讲法,本文运用尽可能简短的文字,通过一个特例勾勒出科里奥利加速度的基本概念。     

Spatial Soliton Solutions in a Harmonic Potential

The F-expansion technique and the homogeneous nonlinear balance principle have been applied for solving a general （19-1）-dimensional nonlinear Schrodinger equation （NLSE） with varying coetficients and a harmonic potential. A family of （1＋1）D spatial solitons has been obtained. The evolution features of exact solutions have been investigated.     

用于太赫兹光源的准等时性储存环的设计

介绍了一种获得准等时性储存环的方案,即调节Lattice参数,在色散段引入负色散函数从而降低线性滑相因子,获得短束团。根据此方案设计了用于相干太赫兹光源的准等时性储存环,结果给出了线形光学函数曲线以及粒子的动力学孔径,表明了通过调节四极铁参数可以达到降低束团长度获得准等时性储存环的目的。还设计了用于准等时性储存环弯铁处的真空室的3维模型,并对其类腔体部分的本征模进行了计算,得到特性阻抗与品质因数的比值在10-3量级以下,表明类腔体部分对束流的影响很小。     

Dynamic Fracture Toughness and Failure Mechanisms of ZnO Whiskers Secondary Reinforced Composites

Quasi-static and dynamic fracture properties and damage mechanism of glass fiber polymer composites embeaaea with different mass percentages of ZnO whiskers are investigated by using an Instron Testing machine and a Split- Hopkinson pressure bar. According to the experimental results and linear fracture mechanics, the quasi-static fracture toughness Kic and the dynamic fracture toughness Kid under various impact velocities of specimens are obtained. Fracture mechanism is investigated by fractography analysis with a scanning electron microscope. The experimental results show that the mass percentage of ZnOw has little influence on the quasi-static fracture toughness, but a little influence on the dynamic fracture toughness and time of initial fracture point of specimens by the reason of various fracture mechanisms.     

某空间望远镜相关跟踪系统摆镜的设计与研究

分析了相关跟踪系统摆镜的设计要求,对摆镜的减重方式进行了研究.选择SiC材料作为镜体材料,设计了三种镜体结构.使用Ansys作为求解器对所设计的镜体结构进行了自重条件下的静力分析,以及频率为100 HZ、振幅±0.1 mrad时的瞬态动力学分析,并给出了不同镜体结构下的计算结果比较.为便于处理有限元结果数据和光学表征参量的关系,在MATLAB环境下编写了统一数据处理程序.计算结果表明所设计的三种方案能够满足光学系统的性能要求.     

Conceptual design of Hefei advanced light source

The conceptual of Hefei Advanced Light Source, which is an advanced VUV and Soft X-ray source, was developed at NSRL of USTC. According to the synchrotron radiation user requirements and the trends of SR source development, some accelerator-based schemes were considered and compared; furthermore storage ring with ultra low emittance was adopted as the baseline scheme of HALS. To achieve ultra low emittance, some focusing structures were studied and optimized in the lattice design. Compromising of emittance, on-momentum and off-momentum dynamic aperture and ring scale, five bend acromat (FBA) was employed. In the preliminary design of HALS, the emittance was reduced to sub nm·rad, thus the radiation up to water window has full lateral coherence. The brilliance of undulator radiation covering several eVs to keVs range is higher than that of HLS by several orders. The HALS should be one of the most advanced synchrotron radiation light sources in the world.