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1.
随着气体检测的广泛应用,SnO2传感器正引起越来越多的关注.基于对SnO2气敏材料的气敏机理进行综合性阐述的基础之上,从气敏材料和传感器设计两方面重点分析了SnO2气体传感器气敏性能的影响因素,并着重分析了运用当前纳米技术制备SnO2传感器的研究进展,进一步讨论了SnO2传感器发展的研究方向与前景.  相似文献   

2.
气体传感器研究的新动态   总被引:2,自引:0,他引:2  
气体传感器研究的新动态孙良彦(吉林大学教授)气体传感器和其它传感器一样,近来发展迅速.在气敏机理及新材料研究的基础上,不断开发出新型气敏元件及其传感器.研究的重点还是如何提高气敏元件的灵敏度、选择性及长期稳定性等方面。国外研究的主要动向如下:1.探索...  相似文献   

3.
随着工业时代到来,为国家发展提供便利的同时,大量排放的有毒气体造成的环境污染问题逐渐影响人们的生活。如何快速有效地检测有毒气体的浓度成为一个重要的研究课题。文章主要通过溶胶凝胶法制备气敏材料,制作气体传感器,针对NO2、SO2、NH3等有毒气体,测试其气敏性能。通过实验与数据分析,对比了几种常用的半导体金属气敏材料WO3、SnO2、In2O3的气敏性能,以及向材料中掺杂贵金属Au后的气敏性能,总结归纳了贵金属Au对几种气体传感器常用半导体金属气敏材料气敏性能的影响。研究发现,贵金属Au对提高气体传感器灵敏度和缩短响应恢复时间方面有着较为正面的作用。  相似文献   

4.
有机/聚合物薄膜声表面波气体传感器的设计简介   总被引:1,自引:0,他引:1  
自1977年第一个声面波气体传感器问世以来,用作传感器敏感膜的气敏材料不断拓展,出现了有机/聚合物薄膜,因为它能与被测气体发生配位反应形成配位键或电荷转移络合物,使传感器既具有一定的选择性又具有较强的可逆性,因而这种薄膜在气敏传感器中  相似文献   

5.
In_2O_3基气体传感器研究现状   总被引:8,自引:0,他引:8  
氧化铟作为一种新的气敏材料,有望在一定程度上解决现有气体传感器中存在的选择性差和工作温度高等问题。因此,按照被检测气体的种类,从In2O3的气敏材料制备及气敏性能两方面对现有性能较好的In2O3气体传感器进行了评述,并指出了In2O3基半导体气体传感器的发展方向。  相似文献   

6.
掺杂CNT的Fe2O3气体传感器对乙醇气敏特性的研究   总被引:1,自引:0,他引:1  
采用酸化后的碳纳米管(CNT)对Fe2O3进行不同比例的掺杂,利用扫描电镜(SEM)对气敏材料进行表征,制作成旁热式气体传感器后在乙醇气氛中与Fe2O3气体传感器进行对比。重点分析了掺杂量,工作温度及气体浓度对传感器灵敏度及响应恢复时间的影响,并对气敏机理进行了详细研究。结果表明碳纳米管的适量掺杂有效的提高了传感器的灵敏度并缩短了响应恢复时间,其中在216℃时对50×10-6的乙醇气体灵敏度达3.4。  相似文献   

7.
王莹 《传感技术学报》2020,33(3):321-326
通过水热法和退火处理制备了不同Pr浓度(0%,1%,2%,4%)的Pr6O11/SnO2复合材料。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和X射线光电子能谱仪(XPS)等方法对制备材料的物相结构、微观形貌和元素组成进行了表征,并制成旁热式气敏元件,对异丙醇气体进行气敏测试。实验结果表明,基于2%样品的Pr6O11/SnO2气体传感器的气敏性能最佳,在最佳工作温度200℃下对100×10^-6异丙醇气体响应达到16.2,是纯相SnO2传感器响应的2.3倍。最后,对基于Pr6O11/SnO2复合材料气体传感器的气敏机理进行了分析讨论。  相似文献   

8.
WO_3气敏薄膜的膜厚对气体响应时间的影响   总被引:1,自引:0,他引:1  
用简单的模型分析了薄膜气体传感器敏感材料的膜厚对气体响应时间的影响,该模型适用于分析WO3薄膜气体传感器的敏感特性。薄膜气体传感器的敏感特性依赖于气体原子在薄膜内的扩散和与气敏材料的响应;而气体原子在薄膜内的扩散是由薄膜厚度决定的。经过推导得出理论上WO3薄膜对NH3的敏感特性,并将其与实验所得的数据进行比较。最后,给出了WO3薄膜气体传感器的气敏特性与气体在其膜内扩散和膜厚的关系。  相似文献   

9.
本文研究了声表面波醋酸气体传感器的气敏特性。选用了复合膜材料,性能稳定响应时间20秒,灵敏度高,膜材料受溶剂的干扰小,选择性好。  相似文献   

10.
气敏传感器对促进科学技术发展、安全生产、环境保护等方面的重要作用及其广泛的应用性,早为国内学者和科技人员所关注。目前,研制气敏传感器的单位上百家,在品种开发和提高产品质量方面的研究也已取得较大进展。国际上一些主要的气敏传感器,例如MOS式、MOSFET式、接触燃烧式、固体电解质式、电化学式、热导式、振动式、电极式等等国内都有研究。此外,利用光纤、LB膜等新技术研究气敏的工作也正在进行。金属氧化物半导体式气敏传感器,由于它能检测的气体品种较多,且检测气体的浓度范围符合易燃、易爆气体LEL值的要求,气敏灵敏度亦较高,价格低廉,因此,和国外一样是研究和生产最多的一种气敏传感器。  相似文献   

11.
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   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
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   

13.
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   

14.
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   

15.
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   

16.
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   

17.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

18.
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   

19.
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.  相似文献   

20.
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.  相似文献   

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