黑龙江移动GSM网络交换设备搬迁建设方案探讨

着重论述了在全网交换设备搬迁过程中，对交换及配套传输工程所采取的关键技术、建设思路、建设方案、阶段安排以及流程分析等，并详细探讨了在搬迁中遇见的问题及解决方案。     

Influence of Photolithography on the Cross-Sectional Shape of Polysiloxane as an Optical Waveguide Material on Printed Circuit Boards

Optical waveguide cross-sectional shapes that deviate from rectangles or squares may cause significant loss of signal. In this study, a photolithography approach was adopted to fabricate waveguides on printed circuit boards, using photo-imageable polysiloxane as a waveguide material. The effects of I-line ultraviolet (UV) lamp exposure, 355-nm Nd:YAG laser direct imaging, and 248-nm excimer laser direct imaging on the cross-sectional shape of waveguides were investigated. For I-line UV lamp exposure, increasing the exposure time could cause changes in the tilt angle of the waveguides from negative (inverted trapezoid) to positive (trapezoid). To obtain rectangular waveguides, the optimum I-line UV lamp exposure time was found to be around 150 s. From the results for 355-nm Nd:YAG laser direct imaging, the width and tilt angle of the waveguides varied with the energy density of the laser beam irradiating the core materials, being controlled by the repetition rate and focus. Lowering the laser energy density could produce waveguides with small widths and tilt angles. Excimer laser direct imaging at 248 nm was found to be unsuitable for waveguide patterning since the core materials could not be cured at this wavelength.     

Application of high-quality SiO/sub 2/ grown by multipolar ECR source to Si/SiGe MISFET

A 5 nm-thick SiO/sub 2/ gate was grown on an Si (p/sup +/)/Si/sub 0.8/Ge/sub 0.2/ modulation-doped heterostructure at 26 degrees C with an oxygen plasma generated by a multipolar electron cyclotron resonance source. The ultrathin oxide has breakdown field >12 MV/cm and fixed charge density approximately 3*10/sup 16/ cm/sup -2/. Leakage current as low as 1 mu A was obtained with the gate biased at 4 V. The MISFET with 0.25*25 mu m/sup 2/ gate shows maximum drain current of 41.6 mA/mm and peak transconductance of 21 mS/mm.<>     

MIS型单晶硅液晶光阀

详细介绍了一种新颖、快速响应的金属－绝缘层－半导体构成的MIS型单晶硅液晶光阀的结构、工作机理、制作工艺和性能参数测试。液晶采用45°扭曲向列型混合场效应工作模式。所得到的光阀的极限分辨率为40lp／mm，口径40mm，最大对比度＞100：1，在930nm（△λ＝40nm）写入光灵敏度为20μW／cm2，响应时间为15ms。报道了该光阀在大屏幕投影显示中的应用。     

加压热煤气脱硫技术研究初步结果

新建成了一套热煤气脱硫剂试验台架系统,加压流化床操作,已成功地投入运行。进行了钛酸锌脱硫剂的初步试验,并取得了4个循环试验的结果。     

Traffic impacts of international roaming on mobile and personal communications with distributed data management

In this paper, we propose four network interconnection scenarios and the related signaling aspects for the international roaming traffic in mobile and personal communications. With or without international gateway relay nodes summarized from the proposed scenarios, we also derive three international roaming network sets {IR₁, IR₂, IR₃} for the observed signaling traffic model with twolevel databases. Based on the proposed performance metrics, analysis results show that under some reasonable assumptions the signaling traffic of international roaming is significantly impacted by the related gateway relay nodes and databases. In addition, the studied cache data management strategy at VLR can reduce the impacts of the signaling traffic of query operation, but the caching approach cannot improve the performance of update operation. Furthermore, the performance of proposed standalone STP scenario is better than that of integrated STP scenario for the international network connection.     

F2分子激光器的研究

总结了Ｆ２分子激光器的实验与理论工作，讨论了该激光器的重要意义及应用，并展望了Ｆ２分子激光器的未来发展。     

一种在对极几何约束下重建三维物体的方法

本文在用对极几何关系重建三维物体的基础上,提出了利用量小二乘法和迭代法相结合的基础矩阵求解算法,推导了新的评价函数作为迭代的误差测度.在每次迭代时,以评价函数作为测度来排除具有较大误差的图象点,而对保留的误差较小的点乘以适当的权值,因此得到精度较高的基础矩阵。实验表明,我们的重建方法比已有算法运算精度更高,性能更稳定,且具有良好的抗噪声性能。     

茂金属催化剂产品性能及应用

文中对茂金属催化剂的研究进展和应用情况进行了介绍,重点说明了茂金属催化剂生产的树脂结构性能、膜性能,以及加工性,与Z/N催化剂生产LLDPE进行了比较,详细阐述了茂金属催化剂树脂的特性;     

基于ML和ESPRIT方法的OFDMA上行链路频偏估计算法

由于载波频偏会给正交频分多址接入OFDMA系统带来子载波之间干扰,从而造成多用户之间的干扰,导致系统性能下降。该文提出一种基于ESPRIT和ML方法联合估计的频偏估计算法。该算法首先使用ESPRIT方法估计出多个可能的频偏构成的子集,然后使用最大似然估计方法在这个有限子集合中搜索出估计的频偏。该算法解决了使用似然估计进行多维搜索的问题,大大降低了算法的复杂度,同时解决了多个频偏估计的问题。