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毛细管非接触电导检测的检测性能与检测池的电极结构密切相关。目前,电极对检测性能的影响主要从实验的角度进行讨论,缺乏理论分析。本文提出了一种新的非接触电导检测池的等效电路模型。通过对检测池等效电路的仿真,发现检测灵敏度与电极的有效长度有关;屏蔽电极能够很好的消除高激发频率下低待测溶液电导值的输出电流幅值/溶液电导曲线的非线性,提高了待测溶液电导的均匀性和最低检测限,使输出电流幅值/激发频率曲线形成稳定的平台区,很好的提高了检测系统的抗干扰能力。本文对提高非接触电导检测的灵敏度具有一定的理论指导作用。 相似文献
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基于电容耦合设计了一种集激励信号发生器、检测池和检测电路于一体的新型毛细管电泳非接触电导检测器,介绍了检测器原理、检测池结构以及电路组成。用常见阴离子混合物(C l-,NO2-,NO3-,SO42-和H2PO4-)对该检测器的性能进行了测试。结果表明:基于3倍基线噪音,检出限除H2PO4-为250μg/L外,其他离子均为10μg/L。峰高的相对标准偏差均小于5%(n=10)。该检测器操作方便、结构简单,具有较高的灵敏度,其分析性能优于多参数传感器。 相似文献
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“翻转芯片焊球点阵排列”是一种表面贴片封装技术,使用翻转芯片与焊球点阵排列相结合的结构。然而,芯片封装的最终质量受制作中每个工艺过程的影响。因此,对于某些工艺流程的实时检测将会在整个工艺流程中起到及其重要的作用。非接触检测技术不但可以检测到芯片中的微观特性,对器件不会造成损坏,而且诸如自动光学检测,自动X射线检测等还能提供良好的工艺控制信息。本文概述了FCBGA芯片封装生产工艺特点以及封装工艺流程,并介绍了运用于其中的光学检测和X射线检测等几种非接触检测技术,着重介绍其中的自动光学检测的基本原理及检测算法,这些方法对于芯片封装工艺中的缺陷检测有重要意义。 相似文献
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光电鼠标芯片组在无接触检测运动物体中的应用 总被引:3,自引:0,他引:3
安捷伦公司的ADNS-2051芯片广泛应用在光电鼠标中,是一种高性能的运动检测器件。本文介绍了一种基于ADNS-2051芯片组、单片机等器件组成的系统,能够在无接触条件下检测运动物体的方向和速度,具有灵敏度高、抗干扰性强等特点。文章重点介绍系统的硬件与软件设计。 相似文献
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S. Shaw 《Journal of Computer Assisted Learning》1993,9(2):93-99
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. 相似文献
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European Community policy and the market 总被引:1,自引:0,他引:1
C. Lloyd 《Journal of Computer Assisted Learning》1993,9(2):86-91
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. 相似文献
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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。 相似文献
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张涛 《计算机测量与控制》2015,23(1):86-89
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值. 相似文献
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Wayne O’Brien Author Vitae 《Journal of Systems and Software》2008,81(11):1997-2013
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. 相似文献
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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. 相似文献
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潘丽 《自动化与仪器仪表》2014,(7):80-82
自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。 相似文献
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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 相似文献
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Jacob Palme 《Software》1979,9(9):741-747
The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users. 相似文献