改善焊料焊接强度的焊剂——阻挡层焊剂

概述了改善的焊剂——阻挡层焊剂,可以抑制Ni的过度扩散,改善焊料与化学镀Ni/闪镀Au镀层的焊接强度。     

Decreasing the Sensitivity of ADC Test Parameters by Means of Wobbling

In this paper we propose a new technique, wobbling, for the stabilization of spectral ADC-test parameters with respect to offset and amplitude deviations of the sinusoidal stimulus. Wobbling aims at removing the effect of the rounding operation that takes place in an ADC, so that the measured harmonic distortion and noise amplitude can be truly ascribed to the intrinsic non-linearity and noise of the ADC. We compare the wobbling technique with subtractive and non-subtractive noise dithering, both from a performance and an implementation point-of-view. We present results of simulations and measurements validating the wobbling technique for use in a production environment.     

测量双层薄同心圆筒接触热阻的瞬态脉冲法

介绍了利用瞬态脉冲法原理双层薄同心圆筒壁间接触热阻的实验技术和装置。建立了用于这估计的数学模型。分析讨论了实验系统传热的特点，确定了实验所需的热绝缘垫圈的厚度。通过实验研究，测量确定了一组双层薄同心圆筒试样的接触热阻。     

3×10^4m^3气柜封油质量的改进

对干式气柜封油质量下降的原因进行了分析，采取更换闪蒸塔填料为鲍尔环填料、改造输油泵进口管线的走向和管径、更换大面积的加热器等措施，消除了输油泵的抽空情况，解决了闪蒸塔闪蒸效果不理想的问题，封油的闪点和粘度指标均达到了工艺要求，确保了气柜的正常运行，保证了瓦斯气正常回收。     

抑制工频串模干扰的平均求和算法对ADC分辨率的提高作用

通过定量分析抑制电网串模干扰的平均算法对ＡＤＣ量化误差统计特性的影响。得出如下结论：对于采用舍入式量化形式的ＡＤＣ，由于电网串模干扰的存在，用于抑制串模干扰的求和平均效应可提高ＡＤＣ的分辨率。从而为用较低分辨率ＡＤＣ构成的仪器获得高精度的测量结果提供了途径和理论依据。     

基于前向神经网络的逐次逼近式非线性A／D转换器

本文提出一种基于前向神经网络的逐次逼近式非线性Ａ／Ｄ转换器。该转换器可以通过学习生成仪器仪表和通信系统中所需要的各种复杂的非线性转换特性。文中举例说明了这种非线性的Ａ／Ｄ转换器在传感器非线性校正中的应用。     

M-SYSTEM DOC闪存盘的原理和开发应用

M-System公司的DiskOnChip（DOC）是一组高性能的单芯片闪存盘.本文通过对目前PC体系结构中系统引导过程的分析,提出了用DOC代替附加引导设备的设计方法,详细介绍了如何将DOC闪存设计为引导设备,并给出具体设计实例.最后对系统性能进行测试分析.试验证明,本设计可通过减少系统引导时间对系统性能进行优化.     

铜闪速炉冰铜温度预测模型的研究

针对铜闪速炉冰铜温度预测问题，提出了一个基于智能集成策略的预测模型。该模型结合了基于热平衡的数学模型和模糊神经网络模型，再通过一个智能协调器输出结果。其仿真结果与冰铜温度真实值基本吻合，可以为生产操作提供指导。     

Comparative evaluation of advanced process control techniques for alumina flash calciners

Few examples of advanced control methods have been reported in the alumina processing industries. Alcoa of Australia Limited in its Western Australian operations has traditionally employed classical methods in its feedback strategies. Three control algorithms, proportional-integral-derivative (PID), dynamic matrix control (DMC) and self-tuning control (STC), were compared in the regulation of calciner furnace temperature at the Wagerup Alumina Refinery of Alcoa of Australia to assess the potential application of advanced control methods. The evaluation was carried out under both fixed and varying production conditions using process dynamic models obtained from identification experiments based on pseudo-random binary input (PRBI) disturbing signals. Measures were defined for controller performance, robustness and complexity. DMC delivered best performance, closely followed by the optimised PID controller. An explicit STC performed poorly, as the near minimum variance nature of the algorithm imparted too much control energy to the process. All the three controllers performed significantly better than the PID control achieved with tuning parameters currently implemented in the refinery.