窄带中频数字接收机高速信号处理技术

窄带中频数字接收机在雷达对抗侦察中得到了广泛应用，其高速信号处理技术是目前研究的重点。本文详细介绍了数字雷达告警接收机高速信号处理技术的发展现状和关键技术，最后通过对该技术的全面分析指出了值得深入研究的领域。     

火电机组运行优化系统的现状与展望

简单回顾了国内外在火电机组运行优化领域的研究历程，列举了目前国内外市场上针对火电机组的各种主流运行优化产品的功能特点和应用情况，分析了国外引进产品和国内自主研发产品在中国当前市场环境下各自的优势和劣势。介绍了当前运行优化系统在国内电站机组的应用现状，阐述了国内外运行优化系统在实际应用中存在的问题，并提出了相应的改进意见。对机组运行优化系统的未来发展进行了展望，指出机组运行优化系统将利用先进技术设备和信息平台，与电站管理紧密结合，在日益规范的市场中不断发展完善，为提高电站经济性发挥更大的作用。     

塔河油田特殊钻井条件下的录井技术

该文阐述了定向井、水平井和欠平衡钻井技术对传统录井方法的影响:钻时偏大、失真,岩屑细、代表性差,荧光常达12级、无意义,全烃值一般在5%以上,难以有效划分油气层;指出在特殊钻井条件下掌握设计指导思想,卡准重要层位是录井工作的关键,重点要参考组分分析数据、定量荧光分析数据和综合录井其它信息才能准确识别油气层。     

光隔离器及其相关的磁光材料

本文简要介绍了磁光隔离器的理论、结构和分类 ,并提出了该器件今后发展的几个问题 ,最后介绍了几种磁光材料     

偏振模色散统计特性的研究

利用动态方程研究了偏振模色散矢量的统计特性 ,分别用统计系综和频率系综两种方法进行数值模拟。数值结果表明 ,统计系综和频率系综两种方法的结果一致。在大归一化距离条件下 ,均方根时延的平方随归一化距离线性变化 ;偏振模色散矢量的各个分量服从高斯分布 ,差分群时延服从麦克斯韦分布 ;偏振模色散矢量弥散于整个邦加球     

Pad effects on material-removal rate in chemical-mechanical planarization

The role of a porous pad in controlling material-removal rate (MRR) during the chemical-mechanical planarization (CMP) process has been studied numerically. The numerical results are used to develop a phenomenological model that correlates the forces on each individual abrasive particle to the applied nominal pressure. The model provides a physical explanation for the experimentally observed domains of pressure-dependent MRR, where the pad deformation controls the load sharing between active-abrasive particles and direct pad-wafer contact. The predicted correlations between MRR and slurry characteristics, i.e., particle size and concentration, are in agreement with experimentally measured trends reported by Ouma¹ and Izumitani.²     

分离纯化低聚异麦芽糖的酵母菌菌株筛选

对山东寿光市保护地蔬菜施肥状况的调查及产生的问题综合评价表明 :寿光市保护地蔬菜施肥用量很大 ,但极不平衡 ,化学氮肥及磷肥施用量过大造成了土壤的盐化、酸化、中微量元素的缺乏及环境的污染 ,使得蔬菜的产品品质下降 ,蔬菜NO-3 含量较高 ,产投比降低。钾肥用量太少 ,植物抗逆性差 ,病虫害严重。提出了蔬菜合理施肥的几项建议。     

彩色显像管电子束亮度分布自动测量系统

电子束轮廓的描述是彩色显像管特性检测中的难点之一。采用光电转换与计算机信息处理技术，通过自动调整边界条件和三次样条拟合的方法建立了电子束轮廓自动测量系统。与传统测量方法相比，该系统精度高，测试速度快，极大地减轻了测试人员的工作强度，并增加了对排列率和并列率等的测试功能。     

Nonepitaxial Orientation in Sol–Gel Bismuth Titanate Films

Control over crystallographic orientation in ceramic thin films is important for highly anisotropic structures. Layered perovskites, like Bi₄Ti₃O₁₂, have interesting properties associated with their ferroelectric nature, which may be fully exploited only when films are highly textured. Textured films of this titanate were fabricated via a sol–gel technique without using epitaxial growth. Orientation in the film is confirmed by XRD and SEM, and supported by refractive index and dielectric measurements. In an attempt to explain the orienting effect, light scattering experiments were conducted to yield information about the molecular size, shape, and conformation of macromolecules as the sol–gel solution ages and condensation reactions proceed. These experiments clearly show an increase in the size of molecular clusters with time. We believe that it is the organization of these large clusters during spin coating, and the relationship of the backbone chemistry to the crystal structure of Bi₄Ti₃O₁₂, that are responsible for the observed orientation.