近几年来国外信息检索模型研究进展

信息检索模型是信息检索的核心.近几年来国外对于布尔模型的研究主要表现在对布尔模型的改进及对扩展布尔模型的进一步优化.对向量空间模型的研究,主要集中在对向量空间模型的扩展研究及对向量空间模型的应用方面.概率模型的发展主要集中在继续对概率模型进一步的研究,其与其它信息检索模型的结合,以及语言模型的研究和发展.近年来对于新兴的基于本体的信息检索模型的研究,主要集中在对基于本体的信息检索模型理论的研究,与其它检索模型的融合,以及基于本体检索模型的应用.国外信息检索模型研究的最新成果,为国内此方面的研究提供了前沿性的参考信息.     

Advances in the phylogenesis of Agaricales and its higher ranks and strategies for establishing phylogenetic hypotheses

We present an overview of previous research results on the molecular phylogenetic analyses in Agaricales and its higher ranks (Agaricomycetes/Agaricomycotina/Basidiomycota) along with the most recent treatments of taxonomic systems in these taxa. Establishing phylogenetic hypotheses using DNA sequences, from which an understanding of the natural evolutionary relationships amongst clades may be derived, requires a robust dataset. It has been recognized that single-gene phylogenies may not truly represent organismal phylogenies, but the concordant phylogenetic genealogies from multiple-gene datasets can resolve this problem. The genes commonly used in mushroom phylogenetic research are summarized.     

路径与模式:大陆与台港澳广电业合作前瞻

伴随着中国大陆的改革开放,广播电视进入了高速发展时期;以国际化大都市香港的广电业发展为最早;台湾广播电视虽然起步较晚,但因其商业性质发展却很快;澳门广播电视由于地域所限,则更注重与内地的合作。近年来,合作正逐步成为大陆与台港澳广播电视互动的主题。本文将探讨这一合作发展的前景。     

全国文化信息资源共享工程与公共图书馆服务理念

全国文化信息资源共享工程是在新形势下构建我国公共文化服务体系、惠及千家万户的一项重要文化基础工程,它的理念是与公共图书馆的理念相同的,图书馆应成为实施文化信息资源共享工程的主体。     

关注弱势群体——联合图书馆的外来工服务

作为公益性文化机构之一,公共图书馆在改善弱势群体文化生态中具有不可替代的优势和职责。禅城区联合图书馆为外来工群体服务的探索与实践包括:以有针对性的文献信息资源建设,倡导学习、阅读;以图书馆服务为纽带,开展丰富多彩的文体活动,提供自我展示与提升的文化平台;开设专题培训与自助培训,成为外来务工人员的文化交流中心和自助培训基地;激发外来务工人员参与意识,发挥其主动性和积极性。     

Book reviews

Zwartjes, Otto, ed. La Sociedad andalusí y sus tradiciones literarias (Foro Hispánico, 7). Amsterdam: Rodopi, 1994.

Brincat, Joseph M. Malta 870–1054: Al‐Himyai's Account and its Linguistic Implications. Malta: Said International Ltd., 1995. 52pp.

Sells, Michael A. Mystical Languages of Unsaying. Chicago: The University of Chicago Press, 1994. 316 pp., US$18.95 (paperback), US$49.91 (cloth).

Diem, Werner, Arabische Geschäftsbriefe des 10. bis 14. Jahrhunderts aus der Österreichischen Nationalbibliothek in Wien (Documents Arabica Antiqua 1), 2 vols. Wiesbaden: Harrassowitz, 1995. Textband ix+518pp., Tafelband 76 plates.

Coope, Jessica A. The Martyrs of Cordoba: Community and Family Conflict in an Age of Mass Conversion. Lincoln: University of Nebraska Press, 1995. xvii+113 pp., US$ 25 (cloth).

Edwards, John. Religion and Society in Spain, c.1492 (Variorum Collected Studies Series: CS 520). Aldershot and Brookfield: Variorum, 1996. x+351 pp., US$ 97.00 (cloth).

Tolan, John Victor, ed. Medìeval Christian Perceptions of Islam. A Book of Essays (Garland Medieval Casebooks, Volume 10). New York and London: Garland Publishing, 1996. xxi+414 pp., US$60.00 (cloth).     

Health resources on the Internet: a basic list

With the plethora of health sites on the Internet, it is sometimes hard to know where to start. This is a basic list of health sites that either cover a subject area comprehensively, or are good general sites to lead to more specific information. Most of these sites include both full-text information as well as links to many other sites on the World-Wide Web. Included are medical, nursing, dental, alternative health, consumer health, organization, and government sites.