高压可视化天然气水合物实验装置的研究

对高压可视化天然气水合物实验装置进行了研究.实验装置以现有天然气水合物开采方法结合水合物法海水淡化技术为研究背景,模拟海洋环境;利用水合物技术原位制备热盐水,开采海洋天然气水合物;采用可视化技术,可观察到水合物晶体状态.实际应用表明,该装置达到了设计效果,同时还可以应用到海水淡化等领域.     

天然气水合物试验装置的智能化设计

介绍了一种天然气水合物实验研究装置，该装置能模拟水合物的生成和开采过程。系统工作稳定，性能完全符合实验要求，自动化程度高，为研究水合物提供了基本保证。     

天然气水合物数据挖掘服务组件的设计与实现

天然气水合物是21世纪一种具有巨大潜在价值的未来能源,在能源危机的今天已经引起各国政府和科研部门的重视。海域天然气水合物勘探调查手段丰富多样,不同的勘查方式涉及的相关地质参数的不确定性比较大,采用的天然气水合物资源分析方法和预测评价方法也都相对较复杂。而数据挖掘技术在数据分析、预测评价等方面优势明显,且在石油勘探及矿山等很多地学领域进行了运用,结果可信度比较高,大大减少了勘测成本。通过对天然气水合物勘查业务和数据进行分析,研究适用于水合物数据挖掘方法,设计并实现了基于IBM SPSS Modeler的天然气水合物数据挖掘服务组件,为天然气水合物勘查领域数据挖掘智能决策产品的研究奠定了良好的基础。同时也能够为海洋地质数据库建设和数据应用打下技术积累,从而为天然气水合物的勘探开发和综合评价提供帮助。     

一种家用天然气阀门状态监测装置的设计

本文提出一种家用天然气阀门状态监测装置,整个装置由控制模块、电源模块、报警模块和采集模块等多部分组成.利用这些模块组成的天然气阀门状态监测装置,可以实时地监测家用天然气阀门的状态,从而提醒天然气使用人员及时关闭天然气阀门,以便更安全科学地使用天然气.该方案具有安装简单、不需要改动现有管道结构、不需要外接电源等优点.     

雅克拉凝析气井特有水合物冻堵规律发现及防治对策

雅克拉采气厂结合生产实际,针对气井生产中发生的天然气水合物冻堵现象,通过科学分析气井冻堵的规律和机理,开展了有针对性的气井天然气水合物冻堵防治措施研究,如优选工作制度,水套炉加热,井下节流,电伴热,回油伴热,中频感应伴热,盐水加注等,这些措施的实施有效解决了气井天然气水合物冻堵问题,大大提高了气井生产时效,取得了良好的经济效益。     

天然气水合物物理化学性质和相平衡数据库系统的设计和开发

天然气水合物作为一种重要的潜在能源，一种导致全球气候变化的因素，一种地质灾害的诱发因素，已经引起了各领域科研工作者的广泛关注。因此，迫切需要建立一个天然气水合物信息系统，以便交流和共享各领域的研究成果。在本工作中，我们设计开发了关于天然气水合物基础性质的数据库系统。目前，本系统所收集的数据主要集中在与天然气水合物开采和应用技术相关的物理化学性质、晶体结构和相平衡数据。本系统不仅能够提供数据检索服务，还能够提供相平衡数据的网络计算功能。本文将对数据收集和数据库开发这两个方面进行讨论。     

APACS控制系统在天然气装置的应用

介绍了APACS系统的硬件构成和软件实现方法,以及其在天然气处理装置中的应用;该系统不仅实现生产装置的监视和控制,同时为塔里木油田数字化油田数据库提供基础生产数据.总结了该系统的功能和性能特点.     

基于CT的含水合物沉积物电阻率测量系统设计与开发

为满足从微观尺度研究沉积物孔隙中水合物分布对电阻率响应特性影响的需求,设计开发了基于CT的含水合物沉积物电阻率测量系统,包括天然气水合物实验模拟部分、电阻率测量部分和CT扫描部分,实现了水合物原位生成过程中电阻率和CT扫描图像的同时监测。通过开展甲烷水合物生成实验,验证了系统的可用性。实验结果表明：（1）电阻率随通过CT图像计算的水合物饱和度呈指数规律上升;（2）水合物饱和度为17.13%~30.72%时,阿尔奇公式中饱和度指数在1.57至2.48之间。所开发的测量系统为进一步开展不同环境条件下水合物生成分解实验提供了技术保障,为研究水合物微观分布对电阻率的影响以及优化水合物饱和度计算模型提供了数据支撑。     

是福还是祸

在化石燃料极度缺乏的今天，不少科学家都在为寻找新能源没日没夜地干着。终究功夫是不辜负有心人的。只要肯用时间下功夫，铁棒也能磨成针。哦不，其实咱们想说的是，经过长期的寻找，中国科学家终于在青海省祁连山南缘永久冻土带成功钻获了天然气水合物，成为世界上第一个在中低纬度冻土区发现天然气水合物的国家。     

CENTUM-CS1000在天然气处理装置上应用

天然气处理装置调节控制回路一般在20-30个回路左右,检测回路一般在300-00点。DCS在天然气处理装置的控制系统应用较多,CENTUM-CS1000系统是日本YOKOGAWA公司生产的中小型DCS,本文介绍该系统在新疆南油田天然气处理装置自控系统设计中应用,并交流在应用中的经验和体会。     

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.