铁基非晶合金整体磁芯轴向拉压型测力传感器的研究与设计

将铁基非晶态合金薄带缠绕成圆柱型应力敏感磁芯,基于压磁效应,使同一传感器实现既能测量拉力,又能测量压力.介绍了传感器的结构和原理,推导出传感器的输出特性方程.通过拉伸和压缩试验,分析了传感器的最佳激磁磁场强度、静态特性以及温度特性.试验数据显示,传感器测量拉伸和压缩载荷时,最大非线性误差分别为0.41％F.S和1.12％F.S,重复性误差分别为0.86％F.S和0.85％F.S,平均灵敏度为0.71 mV/kN和1.16 mV/kN.     

基于非晶合金非对称巨磁阻抗效应的磁传感器设计

以CoFeNiSiB非晶合金薄带为敏感材料,测试分析了其软磁性能,经空气中磁场退火热处理,获得了较好的非对称巨磁阻抗效应(AGMI).以磁场退火处理后的非晶合金薄带为敏感元件,设计了AGMI磁传感器,并对其性能进行了开环和闭环测试.测试结果表明,开环条件下该传感器表现出较高的灵敏度;闭环条件下则表现出更好的线性度和更宽...     

一种基于铁基非晶态合金压磁效应的膜盒式压力传感器

开发了一种基于Fe基非晶态合金薄带压磁效应的膜盒式压力传感器.首先,论述了这种传感器的结构、工作原理、输出特性以及主要参数的选择.然后通过试验,分析了传感器的静态特性以及磁场强度对输出的影响.试验结果表明,本文设计的传感器最大线性误差为1.29%F.S,最大不重复误差为1.56%F.S,最大灵敏度为0.3675mV/k...     

磁弹性传感器检测芯片在凝血检测中的应用

根据磁弹性传感器原理,设计了一种凝血检测芯片。芯片由铁基非晶合金和倒T型塑料底片构成,利用液体黏粘度对铁基非晶合金共振特性的影响实现对凝血过程的动态跟踪和凝血酶原时间的测定。实验结果表明：该检测芯片的幅值响应与凝血过程具有高度的相关性。重复测试3次,利用幅值斜率最大点确定的凝血酶原时间均值为13．7S,而人工试管法的测量结果为13．1S,表明该方法具有较高的准确性。此外,该芯片具有制作简单、成本低廉、体积小、测试用血量少等优点。     

磁头型扭矩传感器气隙补偿研究

针对气隙扰动是影响基于逆磁致伸缩效应磁头型扭矩传感器的输出和灵敏度的主要问题,提出了一种利用电路进行气隙补偿的方案,并利用在旋转轴表面粘贴非晶合金薄带层的方法,实验论证了传感器的基本特性,结果表明:所设计的传感器及其电路具有气隙补偿的能力。     

新型位移传感器

介绍了利用非晶态合金丝制作电感式位移传感器的情况。具体介绍了零磁致伸缩系数非晶丝的磁特性、传感器制作及测量原理。该传感器可检测2μm～4mm的位移量,频响为0～4kHz。     

位移传感器特性区域直线拟合算法分析

在标定位移传感器静态特性时,原始测量数据通常为非线性分布,应选取其中能表征传感器线性特性的区域作为传感器的工作量程.为提高位移传感器特性区域的准确性和可靠性,本文提出一种识别特性区域的计算方法,利用迭代搜索法和最小二乘法拟合直线,求取特性区域的起始点和终止点.这样不仅可以获得位移传感器的最大工作量程,而且为提高传感器静态标定精度提供了保障.计算实例表明了该算法的实用性.     

高灵敏巨磁阻抗小型磁传感器研制

利用单辊快淬法制备了CoFeNiSiB非晶薄带,经过400 A/mm2电流密度、20 ms脉冲间隔条件下的脉冲退火后具有较好的弱磁场灵敏性能.以该带材为磁敏材料,基于纵向驱动方式研制了一种巨磁阻抗(GMI)磁传感器,该磁传感器尺寸小、灵敏度高、频率响应好,±0.05 mT弱磁场范围内灵敏度可达到44.15 V/mT,在高灵敏度小型磁传感器领域具有较大的应用潜力.     

土体微位移精准监测研究

基于光纤光栅传感器制备了一种测量土体内部微变形的位移传感器,该传感器主要包括光纤光栅、PVC(Polyvinyl chloride)管和光纤锚固板.标定试验发现,微位移传感器的最小分辨率为0.0083 mm,灵敏度为0.12 nm/mm,可测量的最大位移为7.58 mm.通过边坡模型试验与有限元模拟计算对比研究发现,有限元计算与光纤光栅传感器的结果吻合较好,3个微位移传感器与有限元计算结果分析所得平均误差仅为0.033 mm,平均误差约为6.7％.本研究制备的微位移传感器具有灵敏度高、制备工艺方便、制备流程快捷、使用方法简单的特点,为土体内部微位移的监测提供了一种新型的测量方式.     

宽线性GMI磁传感器的研制

用单辊快淬法制备的Fe76Si7.6B9.5P5C1.9非晶合金薄带,在540℃空气中退火后具有宽线性的磁敏特性。利用纵向驱动的方法研制一种巨磁阻抗（GMI）传感器,该磁传感器重复性好,迟滞误差小,在-0.3～＋0.3 kA·m-1范围具有比较好的线性度,灵敏度达到12.65mV/A·m-1。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。