全国科技信息系统资源概况

全国科技信息系统的科技信息（情报）机构、职工、馆藏文献资料以及业务活动资金大部分聚集在华北和 华东地区。随着经济和科学技术的发展以及社会对信息和情报需求的增长,这一资源配置将进一步完善和优化。配置 中的各个参数是全国的宏观平均数据,可作为各部门（行业）和各地方优化自身资源配置的背景参考。     

Editors should guide authors＇ attention to bibliographic references

针对作者来稿中对参考文献著录规则执行不力的现状,认为在广泛宣传著录规则之外还应充分利用作者修改稿件的机会,引导他们重视参考文献的著录。     

Difficult to Document: The History of Physics and Allied Fields in Industrial and Government Labs

ABSTRACT

Approximately thirty years ago archivists began formulating new models to guide archival collecting, creating a literature that continues to grow. In the mid-1980s, the introduction of the documentation strategy collection model put new emphasis on cooperation between repositories and among stakeholders. The model initially focused on the history of science, which has traditionally been poorly documented. Today, the documentation strategy model remains an essential tool in preserving the history of physics, astronomy, geophysics, and allied fields. The Center for History of Physics is using it to move beyond the records of academic science to develop strategies to preserve sources in the especially hard-to-document realms of government and corporate research.     

术语标准研制方法及在信息与文献领域中的应用

介绍术语3种标准研制方法及ISO/TC 37制定的主要术语方法论标准,分析总结ISO 5127信息与文献术语国际标准制定中国际专家提出的增删词、结构化显示、概念框架一致性等意见和建议,提出国际标准一致性、术语选择、国际意见等意见处理原则,最后设计ISO 5127术语国际标准维护和发展的结构化SKOS显示方案。     

改进TF-IDF算法的文本特征项权值计算方法

首先,从特征项重要性和类别区分能力的角度出发,通过分析传统的权重函数TF-IDF(term frequency-inverse document frequency)及其相关改进算法,研究文本分类中向量化时的特征权重计算,构建权重修正函数TW。其次,通过对特征词的卡方分布和TW作对比实验,验证TW能提高类别中专有词汇的权值,降低常见但对分类不重要的特征的权值。最后,将TW与TF-IDF结合作为新的特征权重算法,通过在中文分类语料库上的实际分类实验,与其他权重算法比较,验证此种算法的有效性。     

落潮中的探索与发展--二十世纪九十年代革命历史战争小说论

20世纪90年代军事学创作呈现出明显的落潮态势，但是，作为它重要组成部分的革命历史战争小说创作并没停滞。一些作家在英雄性、战争与人道主义及艺术等方面进行了有益的探索，其表现为：英雄性表现方式和显现场所的转换；英雄的世俗性因素的开掘；承载人道主义思索对象的变化及哲学意味的探索；纪实性的强化等。最终使此类创作有了一定程度的发展，从而推动了当代军事学的发展。     

大学生利用文献信息资源的需求趋势分析

在网络环境下,网络技术实现了信息资源的交流和共享,激发了大学生产生新的文献信息需求,促使高校图书馆文献信息资源结构发生变化。了解当今大学生利用图书馆文献信息资源的需求趋势和文献信息的需求规律,充分开发、利用图书馆信息资源是高校图书馆追求的目标。     

Detection and Virtual Reconstruction of the Original Form of a Rock Relief,Lost in Part by Water Erosion

ABSTRACT

Historic rock reliefs are magnificent monuments that represent special events of the past. Due to exposure to the natural environment, these monuments are affected by natural and human erosion mechanisms. Many of them have disappeared over time and are no longer recognizable. This research seeks to find a way to understand the initial shapes of the rock reliefs that have been exposed to steady and prolonged erosion. For this purpose, a case study was selected in southern Iran that has been damaged over hundreds of years by a stream of water and has partially disappeared. The water flow has caused a groove to be formed along the cliff and apparently a strip of the relief has disappeared. Documenting the inner surface of the groove revealed that this surface is not smooth and there are still remnants of unclear reliefs in eroded sections. By examining the erosion effects on initially vertical smooth sections, it was possible to arrive at a formula to determine the damage caused by the water flow on cliffs. Based on this, it was determined to what extent the water flow had reduced the amount of rock at each height. Accordingly, each level of the damaged relief was virtually moved forward to the same extent. In this way, parts of the disappeared rock relief were virtually rebuilt. The results of this study showed that by measuring the gradual and continuous erosion factors and determining the extent of damage, the original shape of the damaged rock reliefs could somehow be reconstructed.     

A New Archival Model?

Abstract

The Downtown Collection's holdings expansively redefine traditional archival models enabling us to rethink key elements of archival theory, methodology, and practice. Further, its commitment to documenting non-traditional subject matter and maintaining dynamic relationships with artists, donors, scholars and the public mirrors the post-structural influence that is felt in the collection. Ultimately, the Collection's efforts to open up the content of its subject-the Downtown New York scene from 1975 to the present-as well as its holdings and follow the material's lead in pushing the limits of library structures, produces an expanded archival model that houses rich forms of material, better intellectual access, and even, for some, social activism.