在调和映射空间上的Dressing作用     

彭家贵  焦晓祥 《中国科学院大学学报》2000,17(1):8-13

得到Dressing作用的一些性质,证明标准的nuniton扩张解在Dressing作用下仍然是标准的n uniton扩张解,因而Dressing作用保持有限调和映射的极小uniton数不变 (后面的结论已被Guest和Ohnita证明)。特别证明对于全纯映射,Dressing作用仅与群元素在零点值有关。此性质表明Loop群在全纯映射上的作用与复线性群在复Grassman nians上的标准作用是等价的。  相似文献   

“借题目写性情”——《儿女英雄传》主题新探     

袁锦贵 《珠海城市职业技术学院学报》2005,11(4):69-74

《儿女英雄传》的主题一向以“宣扬封建忠孝节义”著称，本文从作者本身的创作意图、作品人物形象的塑造、作品情节结构的设置等几个方面详加考察，否定了这一传统观点，提出了“借题目写性情”的新主题观，肯定了作品的时代进步性。  相似文献   

国内外主题图应用研究述评   总被引：1，自引：0，他引：1  

韩永青  陈卓群  夏立新 《图书情报知识》2008,(6):105-109,128

本文对国内外主题图发展概况进行简要回顾,侧重介绍国内外主题图应用研究的相关成果,包括叙词表改进与知识库建构、知识组织与检索、知识建构、网络门户导航与知识导航、语义网应用和学科管理几个方面。指出国内在该领域研究中存在的问题,如尚未形成系统性、规模化研究,研究方法手段比较单一,主题图应用范围领域应进一步扩大等,在此基础上提出今后国内主题图研究的可能走向。  相似文献   

An Integrated Spatial Search Engine for Maps and Aerial Photographs on a Google Maps API Platform     

Tamar Ganor 《Journal of Map & Geography Libraries》2017,13(2):175-197

A traditional library catalog does not do justice to maps and aerial photographs. Text can never fully describe them and maps' and aerial photographs' geographic coverage or perimeters cannot be displayed visually in the online public access catalog (OPAC), so searching based on their textual metadata without specific spatial reference data used also for display purposes is often not enough to locate relevant items. The Hebrew University of Jerusalem's (HUJI) Geography Department has developed a spatial search engine for their scanned aerial photographs collection that allows users to locate one or more aerial photographs according to the area of the Earth's surface that was photographed and their accompanying metadata. The Humanities and Social Sciences Library, which holds a large unscanned print map collection, has asked to integrate a similar map search mechanism in the Department's existing search engine, and a new website was launched in December 2015 (http://ccg.huji.ac.il/aerialphotos/) showing the aerial photographs' center points alongside the maps' rectangle perimeter. The search engine retrieves maps and aerial photographs that intersect with a user-drawn rectangle. This article discusses the characteristics of these collections, the rationale behind searching for maps and aerial photographs together, and the process of defining and building this spatial search engine. This method allows users to view which items are available in their area of interest side-by-side, on a Google Maps background map.  相似文献   

德国环境学科信息门户(PortalU)中主题图技术的应用     

郭清蓉 《新世纪图书馆》2008,(2):90-92

论文介绍了德国环境学科信息门户(Portal U)以及主题图相关知识,分析了主题图技术在PortalU中的应用,并展望了其在学科信息门户中的应用前景.  相似文献   

Finding alternatives when a major database is gone     

Estelle Hu 《Journal of the Medical Library Association》2016,104(2):150-153

Question

What to do when a major database ceases publication?

Setting

An urban, academic health sciences library with four campuses serves a university health sciences system, a college of medicine, and five other health sciences colleges.

Methods

Usage statistics of each e-book title in the resource were carefully analyzed. Purchase decisions were made based on the assessment of usage.

Results

Sustainable resources were acquired from other vendors, with perpetual access for library users.

Conclusion

This systematic process of finding alternative resources is an example of librarians'' persistence in acquiring perpetual electronic resources when a major resource is cancelled.  相似文献   

The Role of Relational Uncertainty in Topic Avoidance among Couples with Depression     

Leanne K. Knobloch  Liesel L. Sharabi  Amy L. Delaney  Samantha M. Suranne 《Communication monographs》2016,83(1):25-48

To address a key gap in theorizing and research, we consider relational uncertainty as an explanation for why individuals experiencing depressive symptoms may be reluctant to talk about sensitive issues. We report closed-ended online survey data from 126 romantic couples in which one or both partners had been professionally diagnosed with depression. Results indicated that relational uncertainty mediated the positive association between depressive symptoms and topic avoidance. Partner effects from men to women also emerged. These findings are valuable for identifying relational uncertainty as a mechanism that may explain people's unwillingness to discuss challenging topics when they are experiencing depressive symptoms.  相似文献   

五人制足球射门点的热图分析     

王伟明  龙婷  夏青 《湖北体育科技》2016,(12)

采用热图分析方法对2004年、2008年和2012年五人制足球世界杯60支球队的射门得分点进行描述。结果表明五人制足球得分点分布呈层级递减的扇形分布,大部分的进球分布在夹角60°内,热图分析能够非常直观呈现出球队进攻点的分布情况,可以作为五人制足球的统计分析方法。  相似文献   

论编制数字地籍图的制图综合方法     

曾如珠 《泉州师范学院学报》2002,20(2):75-78

数字地籍图的制图综合是编制数字地籍图的核心工作 ,文章在讨论了制图综合理论 ,探讨了编辑数字地籍图的制图综合特点的基础上 ,提出了利用现有数字地形图和地籍调查、地籍测量成果编制数字地籍图的制图综合原则和技术方法 .  相似文献   

The relationship between task structure and collaborative group interactions in a synchronous peer interaction collaborative learning environment for a course of Physics     

Sarantos Psycharis 《Education and Information Technologies》2008,13(2):119-128

Although collaborative group work is used by many instructors as a useful educational tool, there is much room for research on how learning actually occurs within collaborative learning environments. This paper attempts to explore the relationship(if any) between task structure and collaborative group interactions in a synchronous peer interaction collaborative learning environment. For this reason, we used the Cmap during a Physics course for Grade 12 students. This paper compares two groups of students, one studying concept maps with single answer task, and the other studying concept maps with variable answer task. The aim of the study presented in this article is to also investigate the influence of task structure on students’ interactivity according to certain indicators and cognitive performance.  相似文献