3D shape measurement of larger complex objects based on fringe cycle correction

The grating fringe on the reference plane is broadened in the intersecting axis system because of oblique-angle projection. In order to solve this problem, we study the theoretical model of the temporal phase unwrapping method based on the fringe cycle correction. We also study the 3D shape measurement theoretical model of the larger complex objects after considering the coordinate deviation and lens distortion. Experimental results demonstrate that the fringe cycle on the reference plane can be corrected to a constant value, the lens distortion can be corrected, and 3D shape of larger complex objects can be accurately measured.     

渐变带隙氢化非晶硅锗薄膜太阳能电池的优化设计

利用一维微电子-光电子结构分析软件(AMPS-1D)在AM1.5G(100 mW/cm2)、室温条件下模拟和比较了有、无渐变带隙氢化非晶硅锗(a-SiGe:H)薄膜太阳能电池的各项性能.计算结果表明:渐变带隙结构电池具有较高的开路电压(V oc)和较好的填充因子(FF),转换效率(E ff)比非渐变带隙电池提高了0.477%.研究了氢化非晶硅(a-Si:H)、氢化非晶碳化硅(a-SiC:H)和氢化纳米晶硅(nc-Si:H)三种不同材料的窗口层对a-SiGe:H薄膜太阳能电池性能的影响.结果显示:在以nc-Si:H为窗口层的电池能带中,费米能级E F已经进入价带,使得窗口层电导率及电池开路电压有所提高,又由于ITO与p-nc-Si:H的接触势垒较低,使得接触处的电场降低,更有利于载流子的收集.另一方面,窗口层与a-SiGe:H薄膜之间存在较大的带隙差,在p/i界面由于能带补偿作用形成了价带势垒(带阶)?E v,阻碍了空穴的迁移,因此我们在p/i界面引入缓冲层,使得能带补偿作用得到释放,更有利于空穴的迁移和收集,得到优化后单结渐变带隙a-SiGe:H薄膜结构太阳能电池的转换效率达到了9.104%.     

Longitudinal conductivity in ABC-stacked trilayer graphene under irradiating of linearly polarized light

We study the effect of linearly polarized light on the band structure and longitudinal conductivity in ABC-stacked trilayer graphene. The linearly polarized light can induce a pair of additional points in ABC-stacked trilayer graphene, where conduct and valence bands touch. The locations of these points are determined by the amplitude of the light. Furthermore, the layer pseudospin polarization can be controlled by the light. When the Fermi energy locates at Dirac points, i.e., E_f=0, the longitudinal conductivity shows resonance phenomena when the light is present. Away from the Dirac points, the longitudinal conductivity is unchanged as varying E_f for weak light field at larger Fermi energy, and the amplitude of longitudinal conductivity can be controlled by tuning the light field amplitude. Moreover, the effect of linearly polarized light on resonance phenomena in k-cubic Rashba-Dresselhaus system under the irradiating of linearly polarized light is discussed.     

离子束溅射Ge量子点的应变调制生长

采用离子束溅射技术制备了单层和双层Ge量子点, 通过原子力显微镜对比了不同Si隔离层厚度和不同掩埋量子点密度情况下表层量子点的尺寸和形貌差异, 系统研究了掩埋Ge量子点产生的应变对表层量子点的浸润层及形核的影响, 并用埋置应变模型对其进行解释. 实验结果表明, 覆盖Ge量子点的Si隔离层中分布着的应变场, 导致表层量子点浸润层厚度的降低, 从而增大点的体积; 应变强度随隔离层厚度的减小而增加, 造成表层量子点形状和尺寸的变化; 此外, 应变还调控了表层量子点的空间分布. 关键词： Ge量子点 埋层应变 离子束溅射     

Sb2O3的丰度对（1-x）La0.6Dy0.1Sr0.3MnO3/（x/2）（Sb2O3）电输运性质的影响

用固相反应法制备(1-x)La0.6Dy0.1Sr0.3MnO3/x/2(Sb2O3)(x=0.00,0.02,0.15)样品,通过X射线衍射(XRD)图谱,扫描电子显微镜(SEM)照片及SEM能谱(EDS),ρ～T曲线研究样品的结构及电输运性质.结果表明:Sb离子没有进入Mn位,Sb2O3包覆在La0.6Dy0.1Sr0.3MnO3颗粒表面,Sb2O3起助熔剂作用,使得复合样品的颗粒变大且大小相对均匀;复合样品的绝缘体-金属转变温度TP较纯的La0.6Dy0.1Sr0.3MnO3的TP提高20K左右,对x=0.15的样品电阻高峰值比纯的La0.6Dy0.1Sr0.3MnO3的峰值电阻率增大两个数量级,用自旋极化隧穿理论予以解释.     

火花通道长度对激光触发开关特性的影响

利用超高速相机,在曝光时间100 ns时,对不同能量下激光在氮气气体开关中形成的火花通道进行拍照,得到了不同焦距下激光波长266 nm时激光火花通道长度与激光能量的关系。开展了激光触发气体火花开关的实验研究,激光触发开关延时、抖动随激光能量的增加而减小。将火花通道长度与激光触发开关的特性进行了分析,气体开关的抖动随着激光火花通道长度的增加而减小,当火花通道沿电极间轴向长度达到开关电极间距40%时,开关的抖动为亚ns量级。     

A convolution-type semi-analytic DQ approach to transient response of rectangular plates

The convolution-type Gurtin variational principle is known as the only variational principle that is, from the mathematics point of view, totally equivalent to the initial value problem system. In this paper, the equation of motion of rectangular thin plates is first transformed to a new governing equation containing initial conditions by using a convolution method. A convolution-type semi-analytical DQ approach, which involves differential quadrature （DQ） approximation in the space domain and an analytical series expansion in the time domain, is proposed to obtain the transient response solution. This approach offers the same advantages as the Gurtin variational principle and, at the same time, is much simpler in calculation. Numerical results show that it is very accurate yet computationally efficient for the dynamic response of plates.     

顶空气相色谱法测定甲氧苄啶中的残留丙烯腈

采用顶空进样模式,以HP-624毛细管色谱柱为分离柱,二甲亚砜为溶剂,氮气作载气,FID为检测器,用气相色谱法测定甲氧苄啶中的残留丙烯腈。丙烯腈的线性范围为0．25～200．10μg,相关系数为0．9999,检出限为0.05μg,测定结果的相对标准偏差为3．4％,平均回收率为100．5％。     

分子激发态光谱和动力学

分子激发态光谱和动力学对于了解分子的电子结构及电子运动、核振动和分子转动之间的相互作用有重要的意义.我们建立起了一套红外－红外双共振实验平台,开展了碱金属双原子分子微扰增强双共振研究,取得了一些重要结果.利用XUV激光结合高分辨光电子能谱的方法,我们研究了一些重要分子离子的光谱,如：CH3CN+/CD3CN+ 的电子运动与核振动之间的相互作用（Jahn-Teller 效应）.     

非晶态固体的结构可以决定性能吗?

晶态固体的力学性能与塑性变形主要由结构缺陷,比如位错的运动决定.而在非晶态固体中结构如何决定性能,仍然是固体力学、材料学和凝聚态物理学共同关心但尚未解决的核心问题之一.传统材料学研究的经典范式为"结构决定性能".遵循这一信条,已经有大量的实验表征与理论、模拟研究,尝试将非晶态固体的某种结构特征与性能建立一一对应关系.但是,科学界对于非晶固体结构-性能关系成立与否,以及背后隐藏的规律知之甚少.本文针对非晶态固体的变形机制以及其微结构特征,基于分子动力学模拟,定量评估短程简单结构与中长程复杂结构在决定非晶态固体动力学性能方面的效用.通过海量抽样每种具体玻璃结构的激活能(标识激发难易程度),尝试将结构参数与激活能建立定量关系,从而揭示出非晶态固体结构-性能关系的隐藏主控因素为结构的空间关联,受限比几何结构本身更关键.只有某种结构在空间上呈现亚纳米级的空间关联长度,这种完备结构才有可能有效地决定非晶态固体的力学性能,而短程简单结构则无效.进一步,给出了评价非晶态固体结构预测性能有效性的普适定量方法,为建立广义无序物质的结构-性能关系提供了筛选准则.