边界元法中非对称满系数矩阵方程组的分块求解法

边界元法中非对称满系数矩阵方程组的分块求解法刘晓坤，王建军（西安石油学院）路民旭，张大鸣（西北工业大学）ＡＢＬＯＣＫＥＱＵＡＴＩＯＮＳＯＬＵＴＩＯＮＴＥＣＨＮＩＱＵＥＡＮＤＩＴＳＰＲＯＧＲＡＭＦＯＲＵＮＳＹＭＭＥＴＲＩＣＤＥＮＳＥＭＡＴＲＩＸＩＮＴＨ...     

酶电极——流动注射法测定酚类

本文将抗生素激活的酪氨酸酶玻碳电极与ＦＩＡ技术相结合,在所选ＦＩＡ体系的参数下,电极测标样的线性范围为１．００×１０＾－６～１．００×１０＾－４ｍｏｌ／Ｌ,测量范围不小于５．００×１０＾－６～１．００×１０＾－４ｍｏｌ／Ｌ,在此范围内ＲＳＤ≤１．８％,ＲＥ≤２．４％（ｎ＝６）。测定某焦化厂含酚废水稀释样（Ｃ苯酚＝４．４９×１０＾－６ｍｏｌ／Ｌ）得ＲＳＤ＝２．８％,加标回收率为９８．４～１００．９％。连续７小时测定的初步结果表明,前４小时无明显的衰减,其ＲＳＤ＝３．０％,后３小时的总衰减率为１３．４％。     

整矩阵的MT分解及MT过程

整矩阵的ＭＴ分解及ＭＴ过程张知难，张建宁（新疆大学）陈伟侯（北京农业大学）ＴＨＥＭＴＤＥＣＯＭＰＯＳＩＴＩＯＮＡＮＤＭＴＰＲＯＣＥＳＳＯＦＮＯＮ－ＳＩＮＧＵＬＡＲＩＮＴＥＧＥＲＭＡＴＲＩＣＥＳ￥ＺｈａｎｇＺｈｉ－ｎａｎ；ＺｈａｎｇＪｉａｎ－ｎｉｎｇ（...     

有机物性估算系统OPES微机版本的研制（Ⅱ）软件的开发与特性

本文主要介绍有机物性估算系统ＯＰＥＳ（ＯｒｇａｎｉｃｐｈｙｓｉｃａｌＰｒｏｐｅｒｔｙＥｓｔｉｍａｔｉｏｎＳｙｓｔｅｍ）微机版本的软件特性。ＯＰＥＳ的总体结构采用将输入、输出与物性估算程序完全分离的策略：实现了系统的有效分解；物性估算程序的进一步分解则有效地解决了在ＤＯＳ环境下开发大型应用程序所面临的内存使用问题；标准化模块的设计思想既提高了软件的开发效率，又方便了今后软件的维护。本文从基础物性数据库检索方法的选择、用户界面的灵活性与智能性、系统的透明性、系统的健壮性等方面介绍了ＯＰＥＳ的使用功能。＊Ｃｏｍｐｏｎｅｎｔ：１＊２４Ｏ５Ｃ３Ｈ３Ｎ１Ｏ７－１３－１（依次是：丙烯腈的ＩＤ号、分子式、ＣＡ登录号）ＣＨ２＝ＣＨＣ＊Ｎ（丙烯腈的ＯＣＳＣＥ线性码）ａｃｒｙｌｏｎｉｔｒｉｌｅ（丙烯腈的英文名）Ｔ２（温度点数为２，温度分别是２９３。１５Ｋ，４５０．００Ｋ）２９３．１５Ｋ４５０．００ＫＰＯ（没有输入压力，压力点数为０）ＰＨ２（相态为液态）ＰＯ３（极性类别是强极性）ｂａｓｉｃｄａｔａｏｆｃｏｍｐｏｎｅｎｔＮｏ．１（从基础数据库中查到的数据）ＳＴＲＣＨ２＝ＣＨＣ＊ＮＲＭ５３．０６００（ｇ／ｍｏｌ）Ｓ（分子量，质量码Ｓ     

NVIDIA GeForce256显卡价格对比

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密技大放送

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结构动力响应计算的瞬时界面关连矩阵法

结构动力响应计算的瞬时界面关连矩阵法杜国君，彭天国（东北重型机械学院）ＴＲＡＮＳＩＥＮＴＢＯＵＮＤＡＲＹＳＵＲＦＡＣＥＲＥＬＥＶＡＮＴＭＡＴＲＩＸＭＥＴＨＯＤＦＯＲＣＡＬＣＵＬＡＴＩＮＧＤＹＮＡＭＩＣＲＥＳＰＯＮＳＥＯＦＳＴＲＵＣＴＵＲＥ￥ＤｕＧｕｏ...     

缺省理论的单调性及其充要条件

缺省理论的单调性及其充要条件孙辉（大连铁道学院计算机科学系大连１１６０２２）ＭＯＮＯＴＯＮＩＣＩＴＹＯＦＡＤＥＦＡＵＬＴＴＨＥＯＲＹＡＮＤＡＮＡＳＣＦＯＲＩＴＳＶＡＬＩＤＩＴＹ￥ＳｕｎＨｕｉ（ＤｅｐａｒｔｍｅｎｔｏｆＣｏｍｐｕｔｅｒＳｃｉｅｎｃｅ，Ｄ...     

在Novell无盘工作站下怎样用好安易会计网络软件

无盘工作站既具有资源共享,又具有硬件配置价格低廉、便于管理、防止病毒入侵等优点,因而是教学和实际使用电算化软件中常被采用的一种网络形式、安易会计软件是一种易学、易用、功能齐全、稳定性和安全性都较好的电算化软件。作者根据多年的会计电算化教学和对会计软件维护中的经验,谈谈如何用好安易会计网络软件。１网络环境的设置１）生成无盘工作站远程映射文件ＮＥＴ＄ＤＯＳ．ＳＹＳ时ＣＯＮＦＩＣ．ＳＹＳ应包含如下语句：ＤＥＶＩＣＥ＝ＨＩＭＥＭ。ＳＹＳＦＩＬＥｓ＝４０ＢＵＦＦＤＲＳ＝２０ＤＯＳ＝ＨＩＧＮ。ＵＭＢ２）做好…     

小麦秆锈病流行的简要模拟模型研究(Ⅰ)一日传染率、潜育期和显症率子模型的建立

通过定量研究和统计分析,找出了影响日传染率和潜育期（显症率）的主导因子。经多元逐步回归建立了日传染率的回归方程,Ｒ１＝０．５０４８＋０．０３４３７ＤＴｉ＋１．９８９＊１０３''ＤＰｉ＊ＤＴｉ＋０．４８５９Ｌｎ（Ｗｌｉ）;Ｒ２＝０．０３６０＋０．２７９９ｓｑｒ（ＤＰｉ）＋０．０３８４ＤＴｉ＋０．７６８０Ｌｎ（ＷＩｉ）;Ｒ３＝－０．９０２７＋０．２５６７ｓｑｒ（ＤＰｉ）＋０．０３９３４ＤＴｉ＋０．８８１２Ｌｎ（ＷＩｉ）。其中,Ｒ１,Ｒ２,Ｒ３分别代表病茎秆、茎秆病斑和叶片病斑的日传染率;ＤＰｉ,ＤＴｉ,ＷＩｉ分别代表露时、露温和风速。显症率采用了方程ＰＰ＝ｓｉｎ２（－１１８．６５＋１．２０８９ＴＴ）进行拟合,ＰＰ为累积显症率,ＴＴ为累积有效积温。     

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.