用粉末X射线衍射数据确定晶胞参数的方法

介绍了从晶体粉末Ｘ射线衍射数据确定其晶胞参数的方法。并用该法求得四方体心晶体结构的锂铜酞花菁ＬｉＣｕＰｃ的晶胞参数ａ＝１．７３６７ｎｍ，ｃ＝１．３６４０ｎｍ，三方晶系Ｒ＾３ｍ空间群结构的锂钴氧化合物Ｌｉ０．５ＣｏＯ２按六方格子划分的晶胞参数ａ＝０．２８０８ｎｍ，ｃ＝１．４０７９ｎｍ。     

CaCu3Ti4O12-ZnNb2O6复合材料的介电逾渗及固相反应

以低εr的ZnNb2O6为基体,以高εr的CaCu3Ti4O12(CCTO)为增强体,研究了CCTO-ZnNb2O6复合材料体系的介电逾渗行为以及高温下的固相反应。结果表明:当CCTO体积分数超过51.0%时,εr突然跃迁,达到5600,表现为介电逾渗。CCTO与ZnNb2O6在900℃以上会发生固相反应,生成Cu0.5Ti0.5NbO4、CaNb2O6、Zn2TiO4及一种与CCTO衍射峰相似、晶格常数比CCTO略大的未知物质,分析认为该未知物质是Nb5+取代CCTO中部分Ti4+而形成的固溶体。     

P2P流量优化技术及标准化进展

文章综述了P2P流量优化的技术路线（P2P应用层优化和层间协同机制）,介绍了目前具有代表性的一些解决方案,如应用层优化方案IDMaps、Vivaldi、iPlan、OnO,层间协作方案P4P、Oracle、PPM和DDP,以及国内外标准化组织标准推进情况。     

A 6 Gbps/pin Low‐Power Half‐Duplex Active Cross‐Coupled LVDS Transceiver with Switched Termination

A novel linear switched termination active cross‐coupled low‐voltage differential signaling (LVDS) transceiver operating at 1.5 GHz clock frequency is presented. On the transmitter side, an active cross‐coupled linear output driver and a switched termination scheme are applied to achieve high speed with low current. On the receiver side, a shared preamplifier scheme is employed to reduce power consumption. The proposed LVDS transceiver implemented in an 80 nm CMOS process is successfully demonstrated to provide a data rate of 6 Gbps/pin, an output data window of 147 ps peak‐to‐peak, and a data swing of 196 mV. The power consumption is measured to be 4.2 mW/pin at 1.2 V.     

In-situ cleaning and passivation of oxidized Cu surfaces by alkanethiols and its application to wire bonding

The treatment of oxidized Cu surfaces using an alkanethiol as a reducing agent has been investigated. Exposure to a dilute solution of 1-decanethiol resulted in the complete removal and/or conversion of CuO and subsequent formation of a passivating thiolate film, a so-called self-assembled monolayer (SAM), on the underlying Cu/Cu₂O surface as evidenced by x-ray photoelectron spectroscopy (XPS) analysis. Morphological changes, monitored by scanning electron microscopy (SEM) and atomic force microscopy (AFM), revealed transformation of the rough, porous CuO layer into a comparatively smooth Cu/Cu₂O surface. Experiments performed on integrated circuit back-end-of-line (BEOL) die structures, comprising Cu/SiO₂ bond pads used as substrates for Cu wire bonding, demonstrate the potential application of a thiol-based in-situ cleaning-passivation procedure in microelectronics.     

基于NS2的Ad hoc网络仿真研究

Ad hoc网络是一种不需要任何通信基础设施的典型的自组织网络,运用ns2对Ad hoc网络尤其是对其路由协议的研究成了广大网络研究者的一种重要手段.本文首先介绍了Ad hoc网络和ns2.然后给出了在ns2下进行Ad hoc网络仿真的步骤和方法.最后给出了AODV路由协议的仿真实例,结果说明了运用ns2研究Ad hoc网络的可行性和有效性.     

正交调制器载波I/Q幅相失配对TCM-8PSK性能影响

论文首先介绍了高速调制解调器中正交调制器载波I/Q支路幅相失配的模型,然后在此模型上推导了TCM-8PSK信号误比特率性能公式,最后运用Matlab中的动态仿真工具Simulink仿真验证了推导结果。推导与仿真结果都表明,在载波I/Q幅相失配条件下TCM-8PSK信号的误比特率性能下降了。     

Growth and dielectric properties of Ta_2O_5 single crystals grown by laser heated pedestal growth technique

Ta2O5 single crystals have been grown by the laser heated pedestal growth (LHPG) technique up to several centimeters length with diameter of 1.1 mm. The crystal, characterized by X-ray diffraction, dielectric measurement, and thermal expansion analysis, has Htri-Ta2O5 symmetry. Dielectric permittivity, loss tangent along [001] and [110] direction were investigated over the temperature range from -80 ℃ to 100 ℃. Large dielectric anisotropy in Ta2O5 single crystal was observed. At room temperature, the dielectric permittivities (1 MHz) along [001] and [110] are 33.2 and 231.9, respectively. The reason of dielectric enhancement in Ta2O5 crystal grown by LHPG was also discussed.     

基于Multisim8的运算放大器的线性应用仿真

在模拟电路的教学中,运算放大器的线性应用无疑是一个重点内容。如果在教学中应用Multisim8仿真辅助教学,可以避免理论教学过程中讲述枯燥,大大提高教学效率。通过仿真可以形象的将运算放大器的应用电路和结果展示在学生眼前,一方面加深学生对理论的理解,另一方面学生通过设计仿真软件看到了实际电路的结构和使用方法。     

基于MAXWELL2D静磁场分析的特种电机教学

特种电机应用越来越广泛,已成为“电机学”教学的重要内容,其结构和磁场分布不同于传统同步电机,是“电机学”教学的难点之一。本文以永磁电机为例,探讨了MAXWELL2D建模实现电机旋转结构动画显示的方法,并利用MAXWELL2D对永磁电机进行静磁场有限元分析,直观呈现电机内磁场分布特点,便于学生理解和接受特种电机的结构和原理。本文方法对于其他特种电机的教学具有参考价值。