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排序方式: 共有183条查询结果,搜索用时 93 毫秒
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水利部珠江水利委员会规划计划处 《中国水利》2007,(11):32-34
大藤峡水利枢纽是珠江流域西江干流上的控制性水利枢纽工程,在流域防洪及水资源方面具有不可替代的作用,同时具有发电、航运与灌溉等综合利用效益。国务院在对《珠江流域防洪规划》的批复中要求抓紧做好前期工作.积极促进大藤峡水利枢纽建设。本文对大藤峡水利枢纽及在珠江防洪与水资源综合利用中的地位与作用进行了简要的介绍。 相似文献
3.
Gabriel LaPlante Andrew E. Marble Bryce MacMillan Pearl Lee-Sullivan Bruce G. Colpitts Bruce J. Balcom 《NDT & E International》2005,38(6):501-507
Water ingress inside honeycomb sandwich panels during service has been linked to in-flight failure in some aircraft. There is an ongoing effort to develop nondestructive testing methods to detect the presence of water within the panels. Magnetic resonance (MR) represents an attractive approach in that it is sensitive to moisture. Using a unilateral MR sensor, testing can be applied directly to the surface of the panel. The viability of MR is demonstrated through laboratory imaging of both water within sandwich panels, as well as the adhesive itself. The detection of water using a one-sided handheld MR sensor is presented. It is shown that simple detection, as well as spatial localization of water within sandwich panels is possible. 相似文献
4.
Force-balance experiments in conjunction with the Johnson-Kendall-Roberts (JKR) theory have been used to determine the work of adhesion between solid systems. It has been shown that deficiencies in understanding the deformation behavior can lead to erroneous results. A modified procedure for determining the work of adhesion by force-balance experiments and JKR theory using normal displacement behavior has been introduced to address these deficiencies. This procedure involves improved experiental and data analysis protocols and has been applied to give more precise work of adhesion values for PDMS poly(dimethylsiloxane)-PDMS, PDMS-F(fluorinated silicon) and PDMS-Si (silicon) systems. The work of adhesion determinations are consistently less than those estimated by contact angle measurements. 相似文献
5.
Judea Pearl 《Annals of Mathematics and Artificial Intelligence》2011,61(1):29-39
Recent advances in causal reasoning have given rise to a computation model that emulates the process by which humans generate,
evaluate and distinguish counterfactual sentences. Though compatible with the “possible worlds” account, this model enjoys
the advantages of representational economy, algorithmic simplicity and conceptual clarity. Using this model, the paper demonstrates
the processing of counterfactual sentences on a classical example due to Ernest Adam. It then gives a panoramic view of several
applications where counterfactual reasoning has benefited problem areas in the empirical sciences. 相似文献
6.
Barbara A. Kitchenham Pearl Brereton Mark Turner Mahmood K. Niazi Stephen Linkman Rialette Pretorius David Budgen 《Empirical Software Engineering》2010,15(6):618-653
Systematic literature reviews (SLRs) are a major tool for supporting evidence-based software engineering. Adapting the procedures
involved in such a review to meet the needs of software engineering and its literature remains an ongoing process. As part
of this process of refinement, we undertook two case studies which aimed 1) to compare the use of targeted manual searches
with broad automated searches and 2) to compare different methods of reaching a consensus on quality. For Case 1, we compared
a tertiary study of systematic literature reviews published between January 1, 2004 and June 30, 2007 which used a manual
search of selected journals and conferences and a replication of that study based on a broad automated search. We found that
broad automated searches find more studies than manual restricted searches, but they may be of poor quality. Researchers undertaking
SLRs may be justified in using targeted manual searches if they intend to omit low quality papers, or they are assessing research
trends in research methodologies. For Case 2, we analyzed the process used to evaluate the quality of SLRs. We conclude that
if quality evaluation of primary studies is a critical component of a specific SLR, assessments should be based on three independent
evaluators incorporating at least two rounds of discussion. 相似文献
7.
Pearl J Leal A Saleh J 《IEEE transactions on pattern analysis and machine intelligence》1982,(3):250-262
This paper describes an operational version of a computerized, domain-independent, decision support system which is based on a novel, goal-directed structure for representing decision problems. The structure allows the user to state relations among aspects, effects, conditions, and goals, in addition to actions and states which are the basic components of the traditional decision tree approach. The program interacts with the user in a stylized English-like dialogue, starting with the stated objectives and proceeding to unravel the more detailed means by which these objectives can be realized. At any point in time, the program focuses the user's attention on the issues which are most crucial to the problem at hand. The structure used is more compatible with the way people encode knowledge about problems and actions, and therefore promises to offer the following advantages: 1) judgments and beliefs issued by the user constitute a more valid representation of the user's experience; and 2) the user may be guided toward the discovery of action alternatives he otherwise would not have identified. 相似文献
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9.
Many information systems are used in a problem solving context. Examples are travel planning systems, catalogs in electronic commerce, or agenda planning systems. They can be made more useful by integrating problem-solving capabilities into the information systems. This poses the challenge of scaleability: when hundreds of users access a server at the same time, it is important to avoid excessive computational load.We present the concept of SmartClients: lightweight problem-solving agents based on constraint satisfaction which can carry out the computation- and communication-intensive tasks on the user's computer. We present an example of an air travel planning system based on this technology. 相似文献
10.
Neutral glycolipids (NGL) are promising diagnostic markers of human gliomas, but differences in NGL with age and sex have
not been examined. Previous work demonstrated that ceramide dihexosides (CDH) levels in mouse kidney are age- and sex-dependent,
probably due to levels of sex hormones. We quantitated CDH in 181 human gliomas and found significant differences with sex
and age, particularly menopause and male puberty. This emphasizes the importance of assessing results of studies on glycolipids
in disease states with respect to age and sex in order to avoid erroneous conclusions concerning the relationship of glycolipid
composition with diagnosis and pathogenesis. 相似文献