微机控制自动调谐的NYAB自倍频激光器的研究

研制出国内第一台微机控制自动调谐的LD泵浦NYAB自倍频激光器。利用计算机控制激光器输出镜作二维扫描,精度达10~(-2)度的量级。激光器产生0.531μm的线偏振绿色激光,基横模运转,阈值泵浦功率为14mW,输出功率达3.6mW,斜效率达3％,偏振度大于99.8％。     

Material properties and effective work function of reactive sputtered TaN gate electrodes

The resistivity,crystalline structure and effective work function（EWF） of reactive sputtered TaN has been investigated.As-deposited TaN films have an fcc structure.After post-metal annealing（PMA） at 900℃,the TaN films deposited with a N₂ flow rate greater than 6.5 sccm keep their fee structure,while the films deposited with a N₂ flow rate lower than 6.25 seem exhibit a microstructure change.The flatband voltages of gate stacks with TaN films as gate electrodes on SiO₂ and HfO₂ are also measured.It is concluded that a dipole is formed at the dielectric-TaN interface and its contribution to the EWF of TaN changes with the Ta/N ratio in TaN,the underneath dielectric layer and the PMA conditions.     

基于Celery的分布式视频计算处理框架

为了实现能够快速高效的使用计算集群解决视频计算问题,提出一种基于Celery的分布式视频处理框架,该框架借鉴了Hadoop的架构设计,提出了API服务器层,JobTracker和TaskTracker的三层架构,并对其进行了优化使之能够兼容计算资源与存储资源的横向扩展和新的计算应用的纵向扩展.详细描述了框架的架构设计和优化设计.实验数据证明分布式计算框架能够高效地利用多节点实现视频计算.     

InCl分子B3П1态时间分辨谱研究

采用激光诱导荧光技术对InCl分子B3П1→X1∑+荧光光谱进行了分析和归属,并对 B3П1(v′=0)→X1∑+(v″=0)的时间分辨谱进行了观测．首次得到InCl分子B3П1态(v′= 0)无碰撞辐射寿命т0≈353 ns,无辐射弛豫速率常数kQ≈1．985×10-10cm3molec-1s-1及 电子跃迁矩｜Re｜2=0．40D2．     

SnO_2压敏材料势垒电压的测量

依照缺陷势垒模型 ,将压敏电阻器视为双向导通的二极管 ,应用半导体理论对低电压情况下的电流 -电压关系数据进行了处理 ,得到了 Sn O2 - Zn O- Nb2 O5压敏材料的势垒电压。选取的 4个测量温度得到的结果是相同的 ,保证了实验结果的正确性。     

Overcoming Hypoxia by Multistage Nanoparticle Delivery System to Inhibit Mitochondrial Respiration for Photodynamic Therapy

Hypoxia, as characterized by the low local oxygen, confers on cancer cells resistance to oxygen‐consuming photodynamic therapy (PDT). The limited success reached by current approaches harnessing reoxygenation to enhance PDT outcome promotes the reconsideration of the design of the therapeutic approach. In this study, a multistage delivery system capable of reversing hypoxia is demonstrated. Unlike previous strategies that only expect to affect the peripheral tumor tissue, the size‐shrinkable system allows those deeply located hypoxia regions to be treated. Specifically, therapeutics, including atovaquone and indocyanine green derivatives that are respectively responsible for oxidative phosphorylation blockage and PDT, are encapsulated in a gelatin nanoparticle, whose structure would rupture to promote deep penetration when facing matrix metallopeptidase 2 enzyme overexpression in tumor tissue. The antihypoxic performance of the platform has been evaluated using a variety of analyses including flow‐cytometry assay, immunofluorescence, and micro‐positron‐emission tomography imaging. Tumor regression in animal models confirms the feasibility and effectiveness of conquering the PDT‐resistance through abrogating the oxygen consumption. It is hopeful that such a strategy could shed light on the development of next‐generation PDT‐adjuvant treatment.     

基于NSCT和仿生模式的人脸图像识别方法

针对现有的人脸图像识别算法准确度不高的问题,提出了一种基于非下采样Contourlet变换(NSCT)和仿生模式的人脸图像识别的方法。对人脸图像进行NSCT分解,并将分解后的各系数矩阵转化为能量特征,利用仿生模式识别算法实现对人脸图像的识别。使用UMSIT、Yale和ORL人脸库进行实验,且设计了无拒识和有拒识两组方案,实验结果表明:与传统方法相比,利用基于非下采样Contourlet变换和仿生模式的人脸图像识别的方法能够获得更高的正确率,而有拒识的方案能够获得更好的综合性能。     

高职高专电工学课程教学改革

针对高职高专培养应用型人才的要求，分析了目前电工学课程教学的现状，提出了电工学课程改革方案。     

掺杂浓度对多晶硅纳米薄膜应变系数的影响

为有效利用多晶硅纳米薄膜研制MEMS压阻器件,本文对LPCVD多晶硅纳米薄膜应变系数与掺硼浓度的关系进行了研究,并利用扫描电镜和X射线衍射实验分析了薄膜的结构特点.结果表明:在重掺杂情况下,纳米薄膜的应变系数明显大于相同掺杂浓度下单晶硅的应变系数,而且掺杂浓度在2.5×1020cm-3左右时,应变系数具有随掺杂浓度升高而增大的趋势.对这种实验结果依据隧道效应原理进行了理论解释,提出了多晶硅压阻特性的修正模型.