一种瓦斯抽放多参数巡检仪的设计

设计了一种瓦斯抽放多参数巡检仪,介绍了该仪器硬件和软件的设计及实现。该巡检仪采用传感器采集甲烷浓度、工况流量、管道温度等主要性能参数;参数经AD转换后,通过RS485上传到上位机,用户通过上位机可以直观地分析瓦斯抽放管道的参数。该仪器具有测量精度高、采集通道多的特点,提高了煤矿瓦斯抽采监测的效率。     

CEL-52型膜盒差压流量计——压力补偿式蒸汽流量计

CEL-52型膜盒差压流量计是与孔板等节流装置配套、能作压力波动影响补偿的流量仪表,专门用以测量饱和蒸汽流量。本仪表针对工业锅炉饱和蒸汽流量测量中工况常有变动的特定条件,用较简单的组件补偿压力波动影响,从而在蒸汽负荷波动、压力变化幅度较大的情况下,获得一定的测量精确度。相对说来,这是一种"价廉"的仪表,价格约为DDZ-Ⅱ型仪表的 1/3。     

8098单片机在流量仪表中的应用

介绍一种利用8098单片机的硬件和软件资源，设计能对多个管道不同介质（蒸汽、天然气、一般气体、液体和油品）流量进行巡回检测的智能流量仪表的方法。实用的通讯功能实现了智能流量仪表的集中管理，仪表通用性强，具有多种自动补偿功能，从而大大提高了仪表计量精度。     

超低功耗流量仪表软件系统设计

由于流量仪表使用条件一般比较恶劣,而仪表本身往往又需连续长期运行,因此,在研制低功耗流量仪表时,必须首先考虑它的功耗和可靠性。本文设计了一种用TI的新型单片机MSP430设计的超低功耗流量仪表系统,利用了MSP430超低功耗和高集成度的优点,该仪表具有功能强、结构简单、可靠性高、抗干扰能力强等特点。根据不同的需求可以应用于多种工业控制现场。本文主要是超低功耗流量仪表的软件设计,主要实现对流量,质量等的测量,通过IAR编译器对设计的程序编译运行,使我们能更好的测试程序是否能满足设计的要求。     

瓦斯抽放管路系统的设计及其设备的配套选型

以某高瓦斯矿井建立瓦斯抽放系统的实践为例,介绍了瓦斯抽放系统中瓦斯抽放管路系统的设计,即管路敷设路线的设计、瓦斯抽放管径的选择、管路阻力的计算;并根据管路阻力的计算结果及瓦斯抽放泵的选型原则,给出了瓦斯抽放泵的选型设计。实际应用表明,该矿采用瓦斯抽放系统后未出现瓦斯超限现象,瓦斯抽放率达到46%。     

大流量污水超声流量计的方案设计和应用

针对大型箱涵污水大流量仪表设计选型的诸多局限性,本文着重介绍了超声流量仪表的基本原理、设计、安装等的要求和应用。该仪表实践使用表明:超声流量计具有其他流量仪表无可比拟的许多优点,是解决大流量计量的有效方法,满足污水大流量计量的要求,具有很高的推广应用价值。     

试从国外流量测量和仪表的发展趋势,谈发展我国流量测量和仪表的几点看法

本文就量值传递与装置、国际标准和四类流量仪表等三个方面论述了国外流量测量和仪表的发展趋势,最后提出了发展我国流量测量和仪表的六点看法。     

一种矿用本安型瓦斯抽放多参数巡检仪原理及应用

主要介绍了矿用本安型瓦斯抽放多参数巡检仪的特点、工作原理和现场应用情况;该巡检仪具有测量方式多、测量范围广、测量精度高、操作简单等特点,巡检仪集热式、差压、单孔等流量测量方式于一体,满足了矿方对于测量方式多样性的要求。针对在实际使用中遇到的问题进行了分析和讨论,并给出了解决方法。实践证明该巡检仪能够提高煤矿瓦斯抽采监测的效率,方便了煤矿工作人员的工作。     

煤矿瓦斯抽放浓度控制系统设计

针对现有煤矿瓦斯抽放控制采用粗放式控制方法存在瓦斯抽放浓度控制缺失和水环真空泵能耗高等问题,设计了一套煤矿瓦斯抽放浓度控制系统。该系统基于分级调节思想,在控制程序集中控制下,通过瓦斯浓度传感器检测抽采管路中的瓦斯浓度,利用PLC逻辑运算功能计算出瓦斯浓度变化率,并根据瓦斯浓度变化分级调节电动瓦斯调节阀开度和水环真空泵变频电动机转速,以提高抽采瓦斯浓度,从而提高抽采瓦斯利用率。试验结果表明,该控制系统能有效提高抽采瓦斯浓度,瓦斯体积分数可提高3.6%～4.2%,使抽采瓦斯利用率大大提高;且节能效果明显,瓦斯抽放浓度控制后节能效果提高了24%。     

流量脉冲信号输出的软件实现

智能流量仪表体现了微处理器和仪表一体化、硬件和软件相结合。为了提高仪表的智能化水平，就要充分发挥微处理器的功能，尤其是利用软件实现仪表的功能。本文论述了作者在设计智能流量仪表过程中，利用８０９８单片机的ＨＳＯ口实现流量脉冲信号输出的软件设计方法，该方法简化了仪表的硬件电路，降低了成本。     

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。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.