自聚焦棒耦合性能的分析

本文采用光线光学的原理分析了自聚焦棒（ＧＲＩＮ）的光学性能，在折射率分布为抛物线近似的条件下，推导出较为简单的ＧＲＩＮ中的光线轨迹方程，并实验测量了ＧＲＩＮ的耦合效率，从而由理论和实验两方面讨论ＧＲＩＮ的聚焦特性。     

一种光时分制交换时隙分配计算算法

介绍了一种专为时分复用系统设计的时院分配计算算法。这种算法中主要用到的技术是从一个话务矩阵的各行选出一个区别代表的系统方法。对于任何话务矩阵，这种算法的分配效率都能达到１００％，所产生的模式矩阵个数最多为ｎ２－２ｎ＋２个（对于ｎ×ｎ矩阵）。     

静态水热脱铝处理对HZSM-5分子筛的结构、酸性和催化性能的影响

开发了一种静态水热脱铝的方法。HZSM-5经此法处理后,正戊烷的裂解活性增加,脱氢和芳构化性能加强。可用改变处理温度的方法来控制脱铝的程度。用XRD和吡啶吸附红外技术进行了研究。HZSM-5分子筛催化剂性能的变化用非骨架铝产生的强L酸中心来解释。     

空分设备的酸性腐蚀及预防

以切换式换热器空分设备为例 ,分析了空分设备酸性腐蚀的原因、可能造成的危害 ,提出了预防措施。     

Ka-band solid-state pulsed Gunn oscillator and power combiner

GaAs Gunn diodes were fabricated for pulse source application at 8 mm wave band and operated with pulsewidths of 0.05 to 2.0 microseconds and duty cycles of 0.001 to 0.01. Peak pulse output power levels of 0.8–1.2W are achieved and the maximum available power is 1.6W with the highest efficiency of 6.5 percent. A simple and compact pulsed power combiner is also given in this paper.     

An electromigration failure model for interconnects under pulsedand bidirectional current stressing

An electromigration failure model which can be used to project the electromigration lifetime under pulsed DC and AC current stressing has been reported. The experimental results indicate that different metallization systems (Al-2%Si, Al4%Cu/TiW, and Cu) show similar failure behaviors, which can be explained and predicted by this model. The pulsed DC lifetime is found to be longer than DC lifetime, and the AC lifetime is found to be very much longer. This recognition can provide significant relief to circuit designs involving metals carrying pulsed DC and AC currents, and allow a more aggressive design to improve circuit density and speed     

超声变幅杆解析法设计的可靠性研究

本文提出了用有限元法验证变幅杆解析法设计的可靠性，对三种类型的变幅杆先作解析法设计；然后利用有限元分析软件ANSYS进行模态分析，确定了变幅杆的固有频率，计算了固有频率与工作频率之间的相对误差，以此来评价解析法设计的可靠性；并分析了影响解析法设计可靠性的两个基本因素。     

Microwave heating synthesis of HgS and PbS nanocrystals in ethanol solvent

A novel route was developed to prepare PbS and HgS nanocrystals in ethanol solvent in the presence of sodium hydroxide by microwave heating method. PbS and HgS nanocrystals were obtained with an average size of approximately 10 and 6 nm, respectively. In the reaction, mercury acetate and lead acetate were used as mercury and lead source; sulfur powder was employed as chalcogenide source. The products were characterized by X-ray powder analysis (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–Vis absorption spectroscopy. The probable mechanism was presented.     

A Unified View on Clustering Binary Data

Clustering is the problem of identifying the distribution of patterns and intrinsic correlations in large data sets by partitioning the data points into similarity classes. This paper studies the problem of clustering binary data. Binary data have been occupying a special place in the domain of data analysis. A unified view of binary data clustering is presented by examining the connections among various clustering criteria. Experimental studies are conducted to empirically verify the relationships.     

聚合物-蒙脱石纳米复合材料的制备、结构与性能

从结构与性能的观点出发,将聚合物-蒙脱石纳米复合材料划分为插层型、层离型和混合型(插层型+层离型),探讨了影响蒙脱石纳米化的因素,提出了蒙脱石纳米化中值得注意的几个问题.