光束偏转法自动测试激光等离子体冲击波系统的研制

根据光束偏转原理，研制了激光等离子体冲击波自动测试系统的硬件和软件。该系统使用计算机与可编程序控制器作为上下位机，采取上下位机通讯的方式控制步进电机及二维移动架的移动，以改变探测光的相对位置，并利用单模光纤和光电倍增管将探测到的光偏转信号传入数字示波器进行存储，最后计算机将示波器中采集到的光偏转信号进行分析处理。使用该系统对激光等离子冲击波的衰减过程进行了实际测试，得到了较为理想的实验结果。     

纳米级包覆层厚度对染料敏化太阳电池中电子注入效率和电子寿命的影响

选取氧化钐作为包覆材料, 采用浸渍法对已烧结好的纳米TiO₂多孔薄膜电极进行修饰, 并将其应用于染料敏化太阳电池中, 研究了纳米级氧化钐包覆层厚度及均匀性对染料敏化太阳电池中电子注入效率和电子复合过程的影响和作用机制. 结果表明, 包覆层厚度对电子注入效率和电子复合具有明显影响, 且电子注入效率和电子寿命随包覆层厚度的增加而呈现相反的变化趋势, 包覆层厚度在0.4 nm以内, 电池性能最好.     

Mean-square composite-rotating consensus of second-order systems with communication noises

We study the mean-square composite-rotating consensus problem of second-order multi-agent systems with communication noises, where all agents rotate around a common center and the center of rotation spins around a fixed point simultaneously. Firstly, a time-varying consensus gain is introduced to attenuate to the effect of communication noises. Secondly, sufficient conditions are obtained for achieving the mean-square composite-rotating consensus. Finally, simulations are provided to demonstrate the effectiveness of the proposed algorithm.     

不确定二阶多智能体系统的鲁棒最优一致

针对不确定二阶多智能体系统,研究了其鲁棒最优一致性问题.首先,基于每个智能体所获得的邻居信息,设计了一个使多智能体系统达到一致的控制协议.其次,研究了多智能体系统的最优一致性问题,给出了系统在满足一定性能指标下达到一致的条件.再次,基于该条件,利用Schur补引理和线性矩阵不等式技术,给出了不确定系统达到鲁棒最优一致的条件.最后,通过仿真验证了所得结果的可行性.     

Nodeless superconductivity in a quasi-two-dimensional superconductor AuTe_2Se_(4/3)

We performed ultra-low temperature thermal conductivity measurements on the single crystal of a new gold-based quasi-two-dimensional superconductor Au Te_2Se_(4/3), which has a superconducting transition temperature Tc = 2.70 K. A negligible residual linear term κ0/T in zero magnetic field is observed, which suggests fully gapped superconducting state.Furthermore, the field dependence of κ0/T is similar to that of the multi-band s-wave superconductor Ba Fe1.9 Ni0.1 As2 at low field. These results reveal multiple nodeless superconducting gaps in this interesting quasi-two-dimensional superconductor with Berezinsky–Kosterlitz–Thouless topological transition.     

Subsolidus Phase Relations in the TiO_2-NiO-WO_3 System

The subsolidus phase relationships of the system TiO2-NiO-WO3 were investigated, aiming at exploring new potential visible-light active photocatalysis systems. After the solid-state chemistry reaction in air between 1000 and 1150 ℃, X-ray diffraction(XRD) data showed that two binary compounds and three ternary-phase regions were contained in this ternary system. No new ternary compound was discovered under our experiment conditions. None of these phases in this system revealed a remarkable homogeneity range.     

核磁共振碳谱研究:烷烃化学位移和(CSS)与分子路径指数矢量(VPM)

系统研究了核磁共振碳谱和化学位移规律及其定量构谱关系(QSSR).本文研究了一组十元素分子路径指数矢量VPM,并发现它与烷烃化学位移和CCS有良好线性相关性.采用多元线性回归进行准确估计与预测,结果优良.     

Au掺杂对TiO_2薄膜表面态及电荷传输性能的影响

采用两步法合成了不同Au掺杂量的TiO_2薄膜材料,并通过循环伏安(CV)和电化学阻抗谱(EIS)探究了不同Au掺杂量TiO_2薄膜的表面态数量及其在禁带中的分布情况.借助强度调制光电流/电压谱(IMPS/IMVS)研究了薄膜内电子传输时间和寿命及界面电荷转移性能等.结果表明,适量Au(摩尔分数0.2%)的掺入可有效降低薄膜的表面态数量,优化表面态分布情况,提高电子在TiO_2/染料/电解质界面的电阻,从而改善电子的传输性能,提升太阳电池的光电转换效率.     

Multiband nodeless superconductivity near the charge-density-wave quantum critical point in ZrTe_(3-x)Se_x

It was found that selenium doping can suppress the charge-density-wave(CDW) order and induce bulk superconductivity in ZrTe_3. The observed superconducting dome suggests the existence of a CDW quantum critical point(QCP) in ZrTe_3-xSex near x ≈ 0.04. To elucidate the superconducting state near the CDW QCP, we measure the thermal conductivity of two ZrTe_(3-x)Se_x single crystals(x = 0.044 and 0.051) down to 80 m K. For both samples, the residual linear term κ_0/T at zero field is negligible, which is a clear evidence for nodeless superconducting gap. Furthermore, the field dependence of κ_0/T manifests a multigap behavior. These results demonstrate multiple nodeless superconducting gaps in ZrTe_(3-x)Se_x,which indicates conventional superconductivity despite of the existence of a CDW QCP.     

基于二相滤波的可重构光学物理不可克隆函数设计

通过研究光学散斑提出一种二相滤波的可重构光学物理不可克隆函数设计方案.首先利用微粒空间布朗运动引起的随机偏差,结合光干涉和衍射机理,实现随机、不可克隆的光学散斑;然后,采用模式选择和二相滤波的方法,实现物理不可克隆函数数据可重构并降低系统误差;最后,通过电荷耦合器件系统采集光学散斑图像,进行二值化和冯诺依曼处理,实现随机性高、鲁棒性强和可重构的物理不可克隆函数输出.制备了10组光学物理不可克隆函数样品并进行测试,每组样品可产生512位二进制数据.实验结果表明所设计的光学物理不可克隆函数输出数据通过美国国家标准技术研究测试,不同工作模式下随机性达99%,二相滤波后系统误差降低3%.