热辐射型光纤高温传感器及其性能研究

介绍了一种光纤高温传感器及其测温原理和测量方法,研究了传感器的设计结构、稳定性、一致性和互换性等。系统根据黑体热辐射原理,采用双波长比色测温法和光纤传感技术来实现准确测温。结果表明:"接触—非接触"式的测温结构避免了光纤直接接触高温源,传输光功率衰减对传感器测量精度的无影响,传感器具有很好的一致性,完全可以互换使用,也可实现高温高压设备中的温度测量。     

光纤传感器高温测量的实验研究

简要介绍了光纤传感器原理中有关光纤的特性及其重要参数，说明了关于高温物体的热辐射性质及光纤传感器在高温测量时的原理，分析了试验中的测试结果。     

工业用热辐射型光纤高温传感器的研究

在分析热辐射测温和光辐射与传输理论的基础上,采用“接触-非接触式”测温原理,研制成功了工业用热辐射型光纤高温传感器。它通过现场校准和工艺控制温度的方法,避开了确定辐射系数的难题。实验结果表明:该传感器可应用于指导批量生产,大大降低生产成本。     

消耗型光纤高温测量仪的研究

在分析比色测温原理的基础上,采用接触测温方法,开发了消耗型光纤高温测量仪,给出了系统的设计方案,并对高温测量中的关键技术问题进行了全面地分析和研究,给出了解决方案。该测温仪具有准确度高、反应快的特点。     

黑体腔光纤高温传感器的原理与应用

光纤传感技术是近年来测量领域的热点之一。由于测量环境的恶劣和限制，使得在某些工业环境中，光纤传感技术的抗电磁干扰、耐腐蚀、防燃防爆等优势得以发挥，得到广泛的应用。本文研究了光纤温度传感的原理，并介绍了一种新型的光纤高温传感器。     

黑体腔光纤高温传感器的原理与应用

光纤传感技术是近年来测量领域的热点之一。由于测量环境的恶劣和限制,使得在某些工业环境中,光纤传感技术的抗电磁干扰、耐腐蚀、防燃防爆等优势得以发挥,得到广泛的应用。本文研究了光纤温度传感的原理,并介绍了一种新型的光纤高温传感器。     

基于单片机的比色光纤高温测量系统设计

比色光纤测温属于典型的非接触式测温技术,具有耐腐蚀、耐高温以及光路可弯曲等优点,适合高温铸造炉等特殊测温场合。但已有的光纤高温仪大多使用DSP处理器,编程复杂且成本高。本文以单片机处理器为核心设计高性价比的比色光纤高温仪。首先介绍比色光纤测温的原理与方法,然后论述基于51单片机的比色光纤高温仪的软硬件设计,重点论述跟单片机有关的温度发送、接收与显示等内容。实验结果表明,最大测温误差不超过8℃,满足一般高温铸造炉的测温要求。     

基于单片机的蓝宝石光纤黑体腔高温测试技术

针对当前瞬态高温测量领域存在的范围窄、精度低和仪器携带不便等问题,介绍了一种利用蓝宝石光纤黑体腔传感器测量高温的简易方法,设计了基于单片机的蓝宝石光纤传感器高温测试方案。用该方案测量乙炔火焰枪高温气流温度,采用STC12C5A60S2系列超低功耗单片机采集经光电模块探测的信号,通过LCD屏显示采集到的温度曲线光滑平稳。实验结果表明测温系统设计合理、直观简单,可用于特殊高温温度场的实际测量。     

蓝宝石晶体高温传感技术研究

针对恶劣环境下高温测量的需要,研究了一种新型光纤高温传感系统;该系统基于白光偏振干涉技术,以蓝宝石晶体为测温材料来进行温度测量,其测量温度可达1600℃.从蓝宝石晶体材料、测温原理、传感头结构设计以及信号处理方法等方面对测温系统进行理论探讨.最后,对测温系统进行了实验验证,利用现有实验条件证明了在0～700℃范围内该系统具有很好的测量精度.     

分布式光纤温度传感器在稠油开采中的应用

为了满足稠油油井安全生产和温度监测的需求,设计了一种传感距离为2 km的分布式光纤温度传感器用于监测稠油油井的温度信息.同时对分布式光纤温度传感器进行了特性分析,并给出了高温温度实验结果.实验结果显示:分布式光纤温度传感器能够在稠油油井温度测量方面进行很好的应用.系统温度范围为0～350℃,测温光纤长为2 km,测量温度精度为±1℃,空间分辨率为1m,为油井井下温度测量提供了科学依据.     

煤矿井下安全监控分站的设计及其仿真实现

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.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate