六种酞菁锌配合物：交叉聚合法合成、分离、光谱和电化学性质

使用2种前驱体1和2(1=4,5-二(4-甲酯基)酚氧取代邻苯二甲腈,2=4-二缩三乙二醇单甲醚取代邻苯二甲腈)与Zn(OAc)₂·2H₂O在DBU(1,8-二氮杂双环[5.4.0]十一碳-7-烯)催化下,在正戊醇中进行酯交换及交叉聚合反应得到6种酞菁锌配合物。通过简单的硅胶柱色谱,可以将这6种配合物Zn[Pc(BP)₄](3),Zn[Pc(BP)₃(TEG)](4),Zn[Pc(BP)₂(TEG)₂]-opp(5),Zn[Pc(BP)₂(TEG)₂]-adj(6),Zn[Pc(BP)(TEG)₃](7)和Zn[Pc(TEG)₄](8)进行分离。对合成的6种化合物进行了质谱,元素分析,紫外-可见吸收光谱,核磁共振谱表征。另外,对这些化合物的电化学性质也进行了研究。     

A new distribution scheme of decryption keys used in optical verification system with multiple-wavelength information

A new distribution scheme of decryption keys used in optical verification systems is proposed. The encryption procedure is digitally implemented with the use of an iteration algorithm in computer. Three target images corresponding to three wavelengths are encoded into three sets of phase-only masks （POMs） by a special distributing method. These three sets of POMs are assigned to three authorized users as the personal identification. A lensless optical system is used as the verification system. In the verification procedure, every two of the three authorized users can pass the verification procedure cooperatively, but only one user cannot do. Numerical simulation shows that the proposed distribution scheme of decryption keys not only can improve the security level of verification system, but also can bring convenience and flexibility for authorized users.     

压缩态光场平衡零拍探测的位相锁定

平衡零拍探测是测量量子光场的重要方法之一. 通过对相位灵敏光学参量放大器注入的信号进行位相调制, 然后利用平衡零拍探测系统测量光学参量放大器输出的压缩光. 将相位灵敏光学参量分别运转在参量放大和参量缩小, 通过观察噪声谱中的调制信号就可确定测量的量子光场是正交振幅或位相分量. 通过解调位相调制信号可获得误差信号, 实现锁定平衡零拍探测系统本底光与待测光场相对位相为零(对应于待测光场振幅噪声分量). 关键词： 平衡零拍探测 位相锁定     

Bearing splitting and near-surface source ranging in the direct zone of deep water

Sound multipath propagation is very important for target localization and identification in different acoustical zones of deep water. In order to distinguish the multipath characteristics in deep water, the Northwest Pacific Acoustic Experiment was conducted in 2015. A low-frequency horizontal line array towed at the depth of around 150 m on a receiving ship was used to receive the noise radiated by the source ship. During this experiment, a bearing-splitting phenomenon in the direct zone was observed through conventional beamforming of the horizontal line array within the frequency band 160 Hz–360 Hz. In this paper, this phenomenon is explained based on ray theory. In principle, the received signal in the direct zone of deep water arrives from two general paths including a direct one and bottom bounced one, which vary considerably in arrival angles. The split bearings correspond to the contributions of these two paths. The bearing-splitting phenomenon is demonstrated by numerical simulations of the bearing-time records and experimental results, and they are well consistent with each other. Then a near-surface source ranging approach based on the arrival angles of direct path and bottom bounced path in the direct zone is presented as an application of bearing splitting and is verified by experimental results. Finally,the applicability of the proposed ranging approach for an underwater source within several hundred meters in depth in the direct zone is also analyzed and demonstrated by simulations.     

快速高分离液相色谱-串联质谱法测定植物组织中雌激素玉米赤霉醇类化合物

应用快速高分离液相色谱-串联质谱仪(RRLC-MS/MS),建立了植物组织中玉米赤霉醇类化合物(α-玉米赤霉醇、β-玉米赤霉醇、α-玉米赤霉烯醇、β-玉米赤霉烯醇、玉米赤霉酮、玉米赤霉烯酮)的检测方法.植物组织样品采用乙腈提取,碱性水溶液反萃取,经混合阴离子(MAX)固相萃取柱进行净化和富集后,用RRLC-MS/MS检测,多反应监测(MRM)模式下进行定性与定量分析.结果表明:玉米赤霉醇类化合物在0～20 μg/kg的线性范围内均具有良好的线性关系,方法检出限(LOD)为0.5 μg/kg,定量限(LOQ)为1.0 μg/kg,6种玉米赤霉醇类化合物的平均回收率为75.8%～105.4%,相对标准偏差为2.4%～12.1%.本方法可用于植物组织中玉米赤霉醇类化合物含量的测定.     

利用波矢滤波超表面实现超衍射成像

超衍射成像是当前光学领域的研究热点.本文利用一种不对称分裂环超表面结构来实现超衍射成像,该结构由上下两个不对称的金属环组成,通过集体陷模共振可实现对入射光的波矢选择性透过.当物体发出或反射的光照射到超表面上时,入射角大于某一角度的入射光会被共振电场耦合吸收或反射,只有低空间频率的光波可以通过,从而减小衍射的影响,实现超衍射成像.数值模拟结果表明了这一方法的可行性.     

Probe gain via four-wave mixing based on spontaneously generated coherence

We have studied the probe gain via a double-Λ atomic system with a pair of closely lying lower levels in the presence of two probe and two coherent pump fields. The inversionless gain can be realized by using nondegenerate four-wave mixing under the condition of spontaneously generated coherence(SGC) owing to near-degenerate lower levels. Note that by using SGC, two probe fields can be amplified with more remarkable amplitudes, and the gain spectra of an extremely narrow linewidth can be obtained. Last but not least, our results show that the probe gain is quite sensitive to relative phases due to the SGC presence which allows one to modulate the gain spectra periodically by phase modulation, and can also be influenced by all laser field intensities and frequencies, and the angles between dipole elements.     

基于密集波分复用的20 Gbit/s大气激光通信

针对目前高速率信息传输的迫切需求,设计并实验了两路数字信号密集波分复用(DWDM)的大气激光通信结构。两路激光波长分别为1 539.76 nm和1 540.55 nm,采用强度调制,光信号经复用和放大后,由光学天线发射,经1 km大气信道传输,在接收端对光谱、波形和眼图进行了测量。实验结果显示,在弱湍流情况下,实现了两路光信号的解复用,并得到了较为清晰的波形图和眼图。两路数字信号的传输速率为20 Gbit/s时,Q因子仍达到5以上。     

角度测量装置在模拟法描绘静电场中的应用

针对现有仪器不能直接对静电场进行定量测量的弊端,利用角度测量装置的测量功能实现对静电场分布的直接定量测量。首先,利用单臂测试探针找到等势点后,利用角度测量装置测量出等势点的极坐标(极径和极角);找到几个不同电势的若干等势点后,利用计算机绘制静电场的等势面和电场线。这样做不仅能直接对静电场的分布进行定量测量,极大地提高实验效率和实验精度,而且将计算机技术引入普通物理实验,促进了物理实验的信息化及多学科知识的融合。