周期性动态热效应光栅的研究

为使激光诱导动态光栅产生在空间上可分辨的高效率衍射光，光栅介质必须足够薄以满足光栅条件，但动态光栅自衍射效率却又随介质厚度的增加而增加，我们提出用相位匹配的周期性薄光栅组可解决这一矛盾，并在实验上用周期性热效应光栅对理论进行了验证。     

Propagation characteristics of a heaviside absorbing layer for TLM

The perfectly matched layer for use with the finite-difference time-domain method is adapted to our transmission-line matrix simulation as what we call a heaviside absorbing layer (HAL). It is shown that the reflection coefficient for the wave incident on a HAL is less than that of the wave incident on a matched-load termination at all angles of incidence. Furthermore, the dispersion relation of a transmission-line matrix mesh of a symmetrical condensed node with both electric and magnetic loss stubs is derived. It provides guidance on how to choose the losses of HAL and other simulation parameters properly     

相干源二维波达方向估计

本文分析了平面阵接收信号的协方差矩阵，发现它可分解为一个广义对称矩阵与一个非广义对称矩阵之和，利用信号协方差矩阵的这一结构特征，重点研究了相干源二维波达方向（DOA）估计．该方法通过构造一个差矩阵，求出其本特征值对应的任一特征向量，利用谱函数估计相干源二维DOA．简要分析了二维DOA估计的分维处理。     

荧光寿命成像显微技术

介绍荧光寿命成像显微（FLIM）技术及其在生物物理、生物化学及临床医学诊断等领域的最新研究成果和发展现状，并就其未来的发展及应用研究进行了讨论。     

TFT-LCD屏缺陷检测的研究

分析了国外目前常用几种薄膜晶体管(TFT)有源矩阵液晶显示（AM-LCD)屏的缺陷检测方法的优缺点。深入研究了TFT-LCD屏的结构、缺陷产生的原因和概率．设计了一种能全面、直观地进行TFT-LCD缺陷检测的方法，该方法不仅能检测出TFT-LCD中各种常见的新短路等硬性缺陷并确定其具体位置．而且能根据TFT-LCD屏质量要求对软性缺陷进行判定。     

用红外热成像技术精确测定物体发射率

根据红外探测器对物体辐射的输出响应，从实际测量的角度提出了物体发射率的一般性定义，分析了红外热成像技术进行精确测量的条件，导出了物体温度Ｔｏｂｊ、环境温度Ｔｓｕｒ、物体发射率ηｏ和测量精度ｅ之间的关系，并建立了一套用红外热成像技术精确测定ηｏ的方法，实验表明该方法可获得满意的测量结果     

高含盐含铁对水中黏土颗粒粒径中值大小的影响

应用显微图象分析系统,研究了水中NaCl、CaCl2、Fe^2＋等对黏土颗粒粒径中值的影响。结果表明：随着体系中离子浓度的增加,颗粒粒径中值增大。当体系中黏土颗粒浓度为100mg／l时,NaCl浓度为40000mg／l时的颗粒长轴粒径中值为13．70μm,短轴粒径中值为10．06μm;CaCl2浓度为5000mg／l时的颗粒长轴粒径中值为12．17μm,短轴粒径中值为7．76μm;Fe^2＋浓度为100mg／l时的颗粒长轴粒径中值为12．53μm,短轴粒径中值为10．25μm。NaCl、CaCl2浓度分别为40000mg／l和5000mg／l、Fe^2＋浓度为30mg／l时,颗粒长轴中值为14．95μm,短轴中值为11．94μm。当水中NaCl、CaCl2、Fe^2＋浓度分别为40000mg／l、5000mg／l和100mg／l时,加入H2O2,颗粒长轴中值增加到22．44μm,短轴中值增加到14．54μm。     

Combating Biofilm Associated Infection In Vivo: Integration of Quorum Sensing Inhibition and Photodynamic Treatment based on Multidrug Delivered Hollow Carbon Nitride Sphere

Recently, quorum sensing (QS) inhibitors (QSIs) have been combined with antibiotics to enhance antibiofilm efficacy in vitro and in vivo. However, targeting QS signals alone is not enough to prevent bacterial infections. Drug resistance and recurrence of biofilms makes it difficult to eradicate. Herein, photodynamic therapy (PDT) is selected to unite QSIs and antibiotics. A synergistically antibiofilm system, which combines QSIs, antibiotics, and PDT based on hollow carbon nitride spheres (HCNSs) is envisaged. First, HCNS provides the multidrug delivering ability, enabling QSIs and antibiotics to be released in sequence. Subsequently, multistage releases sensitize bacteria effectively, potentiating the chemotherapeutic effects of the antibiotics. Finally, the integration of QSIs and PDT not only minimizes the possibility of drug resistance, but also overcomes the problem of limited mass and extension of PDT. Even after 48 h of incubation, the bacterial biofilm is obviously inhibited. And its biofilm disperse efficiency exceeds 48% (compared with QSI‐potentiated chemotherapy group) and 40% (compared with PDT group). Besides, the inhibition of the QS system influences phenotypes related to virulence factor production and surface hydrophobicity, which weaken biofilm invasion and formation. Eventually, this system is applied to disperse bacterial biofilm in vivo. Overall, PDT and QS modulation are devoted to eradicate drug resistance and recurrence of the biofilm.     

多普勒雷达系统中声光调制器的频移误差

声光调制器的频移误差影响多普勒雷达系统的速度精确测量值.为了分析多普勒雷达系统中声光调制器的频移误差,利用自外差的方法研究了声光调制器中声场和光频相互作用而产生的固定频移,通过统计的方法研究了在不同(但恒定)声场驱动频率下声光作用产生的频移误差.实验结果表明:该声光调制器在多普勒雷达系统中所产生的频移误差小于0.61 MHz,即对于1064nm波长,多普勒速度测量误差小于0.3m/s.对多普勒精确测量系统误差分析研究有一定的参考价值.     

n-GaAs和p-GaN晶片的直接键合

采用直接键合的方法成功实现了n-GaAs和p-GaN晶片的高质量键合.扫描电子显微镜观测结果表明,键合界面没有空洞.键合前后光致发光谱测试表明,键合工艺对材料质量影响不大.室温下界面的电流-电压特性表明,键合得到的n-GaAs/p-GaN异质结为肖特基二极管并且理想因子为1.08.n-GaAs和p-GaN材料直接键合的成功对于集成GaAs和GaN材料制备光电集成器件有重要意义.