基于ASP.NET的尾矿库在线安全监测系统设计

论文是关于尾矿库在线安全监测系统的研究与设计.尾矿库在线安全监测系统的设计实施,便于企业和安全监管部门快速掌握与尾矿库安全密切相关的技术指标的最新动态,有利于及时掌握尾矿库的运行状况和安全现状,可以提高尾矿库的安全性,保障库区下游企业正常运转及库区人民群众的生命财产安全,避免因尾矿库事故而造成的环境污染,保 护生态环境.     

尾矿库安全自动化监测系统的设计与实现

为了实现尾矿库的自动化管理,降低尾矿事故发生频率,提高尾矿生产效率,分析了我国尾矿库开发的现状,介绍了尾矿库系统的基本理论,并设计实现了在Visual Studio 2010下用C#语言的尾矿库安全自动化监测系统.该系统可对尾矿库相关数据进行实时监测,同时利用获取的各种数据完成图形输出、报表输出和分级报警功能,此外,系统还提供了GPS控制点在X、Y、Z三个方向上是否超限的预警功能,直观地反映出控制点在空间方向的实时状态.     

计算机监测系统在尾矿库中的应用研究

本文论述了尾矿库安全的关键问题,设计了一种基于GPS-KTK技术尾矿库三维滑动监测系统,实现了尾矿库的在线监测,减轻了工人的劳动强度,提高了矿区的安全,保护了矿区人民的生命和财产安全。     

基于无线传感器网络的光伏组件监测系统

提出了一种基于无线传感器网络的光伏组件远程在线监测方案;利用数字无线通信技术,设计开发了新型光伏组件远程监测系统,详细介绍了系统的组成实现原理和软硬件设计方法;对设计开发的系统进行了验证监测测试实验,监测结果表明:该系统能有效地实现对光伏组件各参数的远程在线监测,简单可靠,具有较高的工程应用及市场推广价值。     

实时变形监测系统在金属矿山尾矿库安全监控中的应用

基于GNSS技术的实时变形监测系统,通过分布在尾矿库的各种终端感应设备,实时在线全自动监测尾矿坝各种数据的变化,一旦发现不正常现象将立即提出警示,评估尾矿坝结构的可靠性,为尾矿库的管理与维护等提供精确及时的数据依据,从而形成尾矿库安全监控、安全分析评价,安全预警,安全指挥管理系统,对尾矿库的安全状态进行实时的监测、分析与预报。     

刮板输送机刮板链故障在线监测系统的研发

阐述了刮板输送机刮板链故障的检测原理,提出了一种刮板输送机刮板链故障在线监测系统的设计方案,给出了系统的结构,重点介绍了系统二次仪表的设计和地面监测软件的开发。该在线监测系统可对现场刮板链的断链、断刮板、堵转、跳链等故障进行实时监测,并可将监测结果及时上传至地面调度室,保障了生产的安全。     

高精度北斗卫星定位的尾矿库在线监测

利用高精度北斗卫星接收机作为主要测量设备再辅以其他传感器、通信网络、计算机服务器,建立一整套基于北斗高精度定位的尾矿库在线监测系统,其可用于远程自动化尾矿库安全监控、安全分析评价及安全预警管理,确保尾矿库的安全。     

基于层次分析法的尾矿库安全标准化评价系统

为了合理地评价尾矿库的安全标准化等级,参考有关的法律法规、技术标准和规范,提出了采用9个一级指标和38个二级指标来评价尾矿库的安全性、采用层次分析法确定各级指标权重值的尾矿库安全标准化评价系统。实际应用结果表明,该系统能更真实、客观地反映尾矿库的安全标准化实际。     

基于SAE J1939的车辆监测与故障诊断车载系统

提出了一种基于SAE J1939协议的车辆状态监测与故障诊断系统设计方案.系统主要由主控制器S3C2440和CAN控制器MCP2510组成;软件在嵌入式Linux平台下开发.该系统可以在线监测汽车各项运行参数和进行在线故障诊断,从而提高了车辆的安全性能.     

基于DSP的棉条信号波谱分析及系统实现

波谱分析是并条机在线监测系统的重要组成部分;设计了基于DSP的波谱分析仪;首先对波谱分析的算法进行了规划和Sim-ulink仿真,然后以DSP为核心进行了硬件系统开发,完成了从数据采集、信号处理到波谱显示的完整系统设计;软件设计中利用RTW-EC生成DSP目标代码,并通过CCSLink将DSP和MATLAB进行连接,从而大大加快了DSP的开发进程,将得到的波谱图与乌斯特仪的计算结果进行比较,其变化趋势基本一致,实验证明,该方案可以高效地实现55个通道的波谱分析,对于在线监测系统具有重要意义。     

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。     

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.     

Editorial: Special issue on recent advances in hybrid control theory and applications

正The demands of a rapidly advancing technology for faster and more accurate controllers have always had a strong influence on the progress of automatic control theory.In recent years control problems have been arising with increasing frequency in widely different areas,which cannot be addressed using conventional control techniques.The principal reason for this is the fact that a highly competitive economy is forcing systems to operate in regimes where     

Information for Authors

正Aim The Journals of Zhejiang University-SCIENCE(A/B/C)areedited by the international board of distinguished Chinese andforeign scientists,and are aimed to present the latest devel-opments and achievements in scientific research in China andoverseas to the world’s scientific circles,especially to stimulateand promote academic exchange between Chinese and for-eign scientists everywhere.     

Enhancing a leaf radiative transfer model to estimate concentrations and in vivo specific absorption coefficients of total carotenoids and chlorophylls a and b from single-needle reflectance and transmittance

The relative concentrations of different pigments within a leaf have significant physiological and spectral consequences. Photosynthesis, light use efficiency, mass and energy exchange, and stress response are dependent on relationships among an ensemble of pigments. This ensemble also determines the visible characteristics of a leaf, which can be measured remotely and used to quantify leaf biochemistry and structure. But current remote sensing approaches are limited in their ability to resolve individual pigments. This paper focuses on the incorporation of three pigments—chlorophyll a, chlorophyll b, and total carotenoids—into the LIBERTY leaf radiative transfer model to better understand relationships between leaf biochemical, biophysical, and spectral properties.Pinus ponderosa and Pinus jeffreyi needles were collected from three sites in the California Sierra Nevada. Hemispheric single-leaf visible reflectance and transmittance and concentrations of chlorophylls a and b and total carotenoids of fresh needles were measured. These data were input to the enhanced LIBERTY model to estimate optical and biochemical properties of pine needles. The enhanced model successfully estimated reflectance (RMSE = 0.0255, BIAS = 0.00477, RMS%E = 16.7%), had variable success estimating transmittance (RMSE = 0.0442, BIAS = 0.0294, RMS%E = 181%), and generated very good estimates of carotenoid concentrations (RMSE = 2.48 µg/cm², BIAS = 0.143 µg/cm², RMS%E = 20.4%), good estimates of chlorophyll a concentrations (RMSE = 10.7 µg/cm², BIAS = − 0.992 µg/cm², RMS%E = 21.1%), and fair estimates of chlorophyll b concentrations (RMSE = 7.49 µg/cm², BIAS = − 2.12 µg/cm², RMS%E = 43.7%). Overall root mean squared errors of reflectance, transmittance, and pigment concentration estimates were lower for the three-pigment model than for the single-pigment model. The algorithm to estimate three in vivo specific absorption coefficients is robust, although estimated values are distorted by inconsistencies in model biophysics. The capacity to invert the model from single-leaf reflectance and transmittance was added to the model so it could be coupled with vegetation canopy models to estimate canopy biochemistry from remotely sensed data.     

Mr. Twinn’s bombes

This article discusses the history and design of the special versions of the bombe key-finding machines used by Britain’s Government Code & Cypher School (GC&CS) during World War II to attack the Enigma traffic of the Abwehr (the German military intelligence service). These special bombes were based on the design of their more numerous counterparts used against the traffic of the German armed services, but differed from them in important ways that highlight the adaptability of the British bombe design, and the power and flexibility of the diagonal board. Also discussed are the changes in the Abwehr indicating system that drove the development of these machines, the ingenious ways in which they were used, and some related developments involving the bombes used by the U.S. Navy’s cryptanalytic unit (OP-20-G).