红外测油仪中信号调理电路的设计与研究

为实现并提高红外测油仪技术指标,对红外测油仪中的信号调理电路进行全新设计。信号调理电路通过由模拟开关器构成的相敏检波电路与双路理想积分器相结合的方式,能在提高信噪比的同时,加快光谱图的扫描速度。系统的控制信号采用AＲM7 系列的LPC2136 芯片实现。该电路适用于处理光信号经过红外测油仪内样品池、热释电传感器以及前置放大和滤波后输出的电压信号。通过大量实验表明,测油仪扫描速度得到了提高,精度也有明显改善,实验结果验证了该电路的可靠性和有效性,实现了对于红外测油仪中信号调理电路的优化。     

全息透镜分光法五自由度测试系统

基于激光全息技术，激光准直技术、激光漂移补偿技术和磁光调制技术的综合运用，研制了以单一激光束为基准，同时测定目标五个自由度偏差的测试系统。该测试系统用于机床变形，风洞应变天平体轴加载自动校测等多个自由度的准直和微小偏移量的测量。     

Is it a short‐memory,long‐memory,or permanently Granger‐causation influence?

Exploring the Granger‐causation relationship is an important and interesting topic in the field of econometrics. In the traditional model we usually apply the short‐memory style to exhibit the relationship, but in practice there could be other different influence patterns. Besides the short‐memory relationship, Chen (2006) demonstrates a long‐memory relationship, in which a useful approach is provided for estimation where the time series are not necessarily fractionally co‐integrated. In that paper two different relationships (short‐memory and long‐memory relationship) are regarded whereby the influence flow is decayed by geometric, or cutting off, or harmonic sequences. However, it limits the model to the stationary relationship. This paper extends the influence flow to a non‐stationary relationship where the limitation is on ?0.5 ≤ d ≤ 1.0 and it can be used to detect whether the influence decays off (?0.5 ≤ d < 0.5) or is permanent (0.5 ≤ d ≤ 1.0). Copyright © 2008 John Wiley & Sons, Ltd.     

CVD金刚石涂层刀具附着力的研究

以压痕法涂层破碎时的负荷来评估附着力,采用稀盐酸对衬底进行表面处理,在ＣＶＤ沉积过程中添加适量粘结促进剂以压抑金属钴的催化墨化作用,沉积合适的厚度,可在硬质合金衬底上得到高附着力的金刚石涂层刀具．用该刀具对含碳化硅颗粒的铝基复合材料进行切削试验,得到了满意的结果．     

The Art of Living with Technology: Turning Over Philosophy of Technology’s Empirical Turn

In this article we seek to lay bare a couple of potential conceptual and methodological issues that, we believe, are implicitly present in contemporary philosophy of technology (PhilTech). At stake are (1) the sustained pertinence of and need for coping strategies as to ‘how to live with technology (in everyday life)’ notwithstanding PhilTech’s advancement in its non-essentialist analysis of ‘technology’ as such; (2) the issue of whether ‘living with technology’ is a technological affair or not (or both); and (3) the tightly related question concerning the status of the methodological bedrock of contemporary PhilTech, the ‘empirical turn.’ These matters are approached from the perspective of the philosophical notion of the ‘art of living,’ and our argumentation is developed both as a context for and on the basis of the contributions to the special issue ‘The Art of Living with Technology.’     

流动电流检测及应用

简要介绍了流动电流产生原理,根据该原理,制作了一种检测流动电流的传感器,依据传感器的结构和动作原理,详细地推导出了传感器输出信号表达式,并简单介绍了流动电流检测技术在给水处理领域的应用。     

焊接缺陷实时成像自动检测技术的研究

对射线实时成像检测技术的发展现状进行了分析 ,指出了目前存在的主要问题。以焊接缺陷的射线实时成像检测为对象 ,简要介绍了图像增强及去噪声等预处理方法。对缺陷提取技术进行了研究 ,设计了基于灰度梯度的焊缝边界提取方法 ,采用基于分离焊缝的拟合 DSA方法进行特征提取 ,详细介绍了有关算法并给出了实际处理结果。另外 ,提出了提取结果相关性修正的概念及算法并对缺陷类型识别方法进行了研究。采用上述方法开发完成了一套焊缝缺陷实时成像检测系统     

非均匀球对称介质的迁移算子广义本征函数系统的完整性

本文讨论了一类具各向同性、单能、非均匀球对称介质的迁移算子的广义本征函数系统的完整性，证明了：当迁移半群退化时，迁移算子广义本征函数系统不完整；当迁移半群非退化和满足相对收敛条件时，迁移算子广义本征函数系统完整。