一种将静态电流与动态电流相结合的集成电路故障定位算法

本文提出了一种新的故障定位算法。该算法将静态电流诊断方法与基于小波分析的动态电流诊断方法相结合，并通过模式识别进行决策，实现可精确到电路元件的CMOS集成电路多故障定位。经过仿真实验证明，该算法的可行性和有效性。     

Field Emission Properties of Nano-DLC Films Prepared on Cu Substrates by Pulsed Laser Deposition

Nano-diamond like carbon (DLC) thin films were prepared on fused silica and Cu substrates by the pulsed-laser deposition technique with different laser intensities. Step-measurement, atomic force microscope (AFM), UV-VIS-NIR transmittance spectroscopy and Raman spectroscopy were used to characterize the films. It was shown that the deposition rate increases with the laser intensity, and the films prepared under different laser intensities show different transparency. Raman measurement showed that the content of sp³ of the Nano-DLC thin films decreases with the laser intensity. The field emission properties of the Nano-DLC thin films on Cu substrates were studied by the conventional diode method, which showed that the turn-on field increases and the current density decreases with sp³ content in the films. A lower turn-on field of 6 V/um and a higher current density of 1 uA/cm² were obtained for Nano-DLC thin films on Cu substrate.     

Fluxing Agents on Ceramification of Composites of MgO-Al<Subscript>2</Subscript>O<Subscript>3</Subscript>-SiO<Subscript>2</Subscript>/Boron Phenolic Resin

Fluxing agents of zinc borate, antimony oxide, galss frit A and glass frit B, with different melting or softening point temperatures, were added into MgO-Al₂O₃-SiO₂/boron phenol formaldehyde resin (MAS/BPF) composites to lower the formation temperature of eutectic liquid phase and promote the ceramification of ceramifiable composites. The effects of fluxing agents on the thermogravimetric properties, phase evolution, and microstructure evolution of MAS / BPF composites were characterized by TG-DSC, XRD and SEM analyses. The results reveal that the addition of a fluxing agent highly reduces the decomposition rate of MAS / BPF composites. Fluxing agents lower the formation temperatures of liquid phases of ceramifiable MAS / BPF composites obviously, and then promote the ceramification and densification process. The final residues of composites are ceramic surrounded by large amount of glass phases.     

Preparation of Ni/PZT core-shell nanoparticles and their electromagnetic properties

The Ni nanoparticles coated with Pb(Zr,Ti)O_3(PZT) were synthesized by a sol-gel method and in situ reaction. And their structure, oxidation resistance, and electromagnetic properties were investigated. The X-ray diffraction patterns(XRD) exhibited that a small amount of impure phase characterized to Ni(OH)_2 was detected from the ammonia-treated Ni nanoparticles and the ammonia-treated Ni nanoparticles coated with PZT. After being pre-treated with aqueous ammonia, the PZT coating layer was more uniform and about 10 nm in thickness. The oxidation resistance of the ammonia-treated Ni nanoparticles coated with PZT, compared with that of the non-treated ones, was improved by about 66 ℃. The PZT shell layer prepared by in-situ reaction can greatly reduce the dielectric constant and improve the natural resonance loss at high frequency, so as to obtain the optimal impedance matching performance of the electromagnetic wave transmission.     

模糊自寻优策略在箱式炉燃烧系统中的应用

针对钢铁热处理行业中典型的燃气加热炉控制对象中最为复杂的燃烧过程进行了研究，分析了燃烧效率与空燃配比之间的关系特性，介绍了自寻优控制的特点和空燃比模糊寻优控制器设计的详细方案。通过对传统控制方法进行比较，系统采用PLC为控制核心，运用模糊自寻优控制策略，对复杂的非线性燃烧对象进行控制，保证了燃烧过程处于合理的状态。     

用于不同密度聚类的多阶段等密度线算法

多阶段等密度线算法是在基于网格的等密度线聚类算法的基础之上 ,采用多阶段的聚类方式来解决分布密度变化较大的数据集的聚类分析问题. 该算法能够找出分布密度不同的各种类别 ,并能很快地处理高维数据集. 此外 ,还能有效地对时间序列数据集进行聚类.     

基于ASP.NET的旅游网站的设计与实现

本文通过对旅游行业现状进行分析提出了基于ASP.NET的开发思路,介绍了旅游网站的功能设计、数据库设计和具体模块的实现代码。旅游网站包括旅游信息浏览、预定线路和后台管理等功能,通过旅游网站,可以满足游客的个性化需求,提高旅游服务质量,增加效益。     

Parallel computing strategy for the simulation of particulate flows with immersed boundary method

A parallel computing strategy for the simulation of particulate flows with immersed boundary technique is proposed. This strategy can deal with the coupling between fluid and particle easily when particle crosses the boundaries of sub-domains which are decomposed from original computational domain. And a two-dimensional circular particle settling in a closed rectangular domain is simulated with the parallel technique and immersed boundary method to validate the parallel efficiency. Supported by the National Natural Science Foundation of China (Grant Nos. 50506027, 50736006, and 50776080)     

快速移动环境中的MIMO-OFDM系统信道估计算法

针对快速移动环境中存在的多普勒效应．研究了两种多输入多输出正交频分复用系统在快衰落信道中的误码性能．采用空频编码梳状等间隔导频插入方式．以及完全最大似然空频分组码解码算法．使用导频与接收信号进行信道参数估计，将一般多输入多输出正交频分复用系统中的基于训练序列的最小均方误差信道估计算法推广到了快衰落信道环境中．由仿真结果得知：这种改进的信道估计算法在子载波数为256个、插入导频为32个、并以等间隔方式插入导频时．系统的抗多径能力比较理想．可满足快速移动的信道环境要求．