含机浆系统中铝离子对湿部化学特性影响的研究

含机浆系统是新闻纸、低定量涂布纸等印刷纸种常用的造纸系统。在酸性含机浆系统中AI2（SO4）3是最主要的添加物,但它对其他阳离子助剂有一定的影响。文国从纸浆对铝离子的吸附以及电荷分析和测量等方面研究了AI2（SO4）3对造纸湿部化学特性的影响,提出了AI2（SO4）3用量的严格界限。     

基于裂纹闭合解析模型和神经网络理论的疲劳裂纹扩展速率的计算

用裂纹闭合的解析模型作为计算模型,运用神经网络理论对其中的协调方程进行求解,给出了相应的神经网络的结构和参数;对２２１９Ｔ８５１铝合金板材的疲劳裂纹扩展速率的计算进行了数值模拟,与实测结果对比相差很小。计算时间为电路时常数数量级。     

单刚矩阵计算用神经网络结构的实验确定

提出将BP网络与函数型网络相结合用于有限元单元刚度矩阵的实时计算,给出了网络结构的设计依据,对不同阶数输入向量的网络的收敛速度进行了对比分析,为网络输入参数数目的确定提供了参考。     

微机械振动陀螺的耦合误差和隔离耦合的结构设计

微机械振动陀螺是近几年发展起来的新型惯性元件,其误差源主要有微机械结构的Brownian噪声,电路噪声,机械耦合误差及电子机械耦合误差等,这些误差严重影响陀螺仪的精度。本文提出了单级隔离耦合和双级隔离耦合的结构方案,有效减小机械耦合误差,提高精度。     

车用增压柴油机的平衡和分析

分析法是一种新的热力学分析法: 本文对车用增压柴油机各主要部件进行了分析。并介绍分析法在495Q型车用柴油机上的应用,最后进行了平衡和效率的计算并提出涡轮增压车用柴油机减少损失的途径。     

用小直径颗粒床改善池内沸腾的热滞后特性

对水平表面上小直径颗粒床的饱和池沸腾传热做了实验研究,发现热滞后特性获得了重大的改善,使温度过头现象可以消除,因而这种方法可能用以改进微电子元件的冷却。但沸腾传热在高热流下比平板时明显恶化。     

Image shadow removal using pulse coupled neural network

This paper introduces an approach for image shadow removal by using pulse coupled neural network (PCNN), based on the phenomena of synchronous pulse bursts in the animal visual cortexes. Two shadow-removing criteria are proposed. These two criteria decide how to choose the optimal parameter (the linking strength /spl beta/). The computer simulation results of shadow removal based on PCNN show that if these two criteria are satisfied, shadows are removed completely and the shadow-removed images are almost as the same as the original nonshadowed images. The shadow removal results are independent of changes of intensities of shadows in some range and variations of the places of shadows. When the first criterion is satisfied, even if the second criterion is not satisfied, as to natural grey images that have abundant grey levels, shadows also can be removed and PCNN shadow-removed images retain the shapes of the objects in original images. These two criteria also can be used for color images by dividing a color image into three channels (R, G, B). For shadows varying drastically, such as the noisy points in images, these two criteria are still right, but difficult to satisfy. Therefore, this approach can efficiently remove shadows that do not include the random noise.     

移动通信网无线信号场强预测的反演实现

本文提出了一种新的移动通信网无线信号场强预测技术，该技术基于消除快速衰落后得到的可靠与稳定的扫频测量数据，通过反演的途径实现中值场强预测。该技术既可以摆脱对地形地物数据库或三维数字地图的直接依赖，同时也可以得到满足移动网络优化实际需要的较高预测精度。     

MEMS耦合场分析与系统级仿真

微机电系统的计算机辅助设计是MEMS真正走向市场的重要基础。耦合场分析与系统级仿真是MEMSCAD中2个最关键的环节。概括了MEMSCAD的体系结构；综述了耦合场计算的常用数值方法及应用范围；着重介绍了适合于MEMS系统级仿真的2个基本模型的基本思想、构造方法，分析了各自的优缺点，指出今后有待继续研究的几个问题。     

Abnormal Graphitization Behavior in Near-Surface/Interface Region of Polymer-Derived Ceramics

The in situ free carbon generated in polymer-derived ceramics (PDCs) plays a crucial role in their unique microstructure and resultant properties. This study advances a new phenomenon of graphitization of PDCs. Specifically, whether in micro-/nanoscale films or millimeter-scale bulks, the surface/interface radically changes the fate of carbon and the evolution of PDC nanodomains, promotes the graphitization of carbon, and evolves a free carbon enriched layer in the near-surface/interface region. Affected by the enrichment behavior of free carbon in the near-surface/interface region, PDCs exhibit highly abnormal properties such as the skin behavior and edge effect of the current. The current intensity in the near-surface/interface region of PDCs is orders of magnitude higher than that in its interior. Ultrahigh conductivity of up to 14.47 S cm⁻¹ is obtained under the action of the interface and surface, which is 5–8 orders of magnitude higher than that of the bulk prepared under the same conditions. Such surface/interface interactions are of interest for the regulation of free carbon and its resultant properties, which are the core of PDC applications. Finally, the first PDC thin-film strain gauge that can survive a butane flame with a high temperature of up to ≈1300 °C is fabricated.