全文获取类型
收费全文 | 1227篇 |
免费 | 30篇 |
国内免费 | 30篇 |
专业分类
电工技术 | 12篇 |
综合类 | 106篇 |
化学工业 | 32篇 |
金属工艺 | 16篇 |
机械仪表 | 17篇 |
建筑科学 | 461篇 |
矿业工程 | 15篇 |
能源动力 | 31篇 |
轻工业 | 41篇 |
水利工程 | 49篇 |
石油天然气 | 56篇 |
武器工业 | 3篇 |
无线电 | 33篇 |
一般工业技术 | 51篇 |
冶金工业 | 27篇 |
原子能技术 | 4篇 |
自动化技术 | 333篇 |
出版年
2024年 | 3篇 |
2023年 | 7篇 |
2022年 | 10篇 |
2021年 | 12篇 |
2020年 | 20篇 |
2019年 | 27篇 |
2018年 | 11篇 |
2017年 | 11篇 |
2016年 | 34篇 |
2015年 | 46篇 |
2014年 | 46篇 |
2013年 | 113篇 |
2012年 | 75篇 |
2011年 | 87篇 |
2010年 | 70篇 |
2009年 | 63篇 |
2008年 | 56篇 |
2007年 | 67篇 |
2006年 | 82篇 |
2005年 | 64篇 |
2004年 | 52篇 |
2003年 | 52篇 |
2002年 | 38篇 |
2001年 | 40篇 |
2000年 | 51篇 |
1999年 | 32篇 |
1998年 | 27篇 |
1997年 | 27篇 |
1996年 | 17篇 |
1995年 | 7篇 |
1994年 | 2篇 |
1993年 | 6篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 3篇 |
1989年 | 6篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1983年 | 6篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1970年 | 1篇 |
1956年 | 1篇 |
排序方式: 共有1287条查询结果,搜索用时 15 毫秒
21.
《国际互联网参考资料服务季刊》2013,18(4):57-76
Abstract The World Wide Web offers a large and ever-expanding number of resources in the fields of psychology and sociology. Growth of the Web has been so fast that it has been difficult to keep track of all the new resources that are rapidly becoming available. With so many new Web sites cropping up, there is a growing need to sort through these resources and determine which sites are the most valuable for research in these subject areas. This study first discusses some criteria for assessing the quality of Web sites, and then applies these criteria to the Web sites currently available in an effort to determine which sites are the best for these two fields. 相似文献
22.
《国际互联网参考资料服务季刊》2013,18(1):5-14
Abstract With the explosion of the World Wide Web, numerous search engines have proliferated online, claiming to be the best, fastest, or most accurate. Though each product is slightly different from the others in its presentation and search architecture, what all are providing is keyword searching of the Web's millions of pages. However, there are circumstances, just like in a library catalog, where an individual may want to perform a known-item search rather than a keyword search. The purpose of this paper was to discover whether known-item searches are possible with some of the Web's most popular search engines, and if the results retrieved using such a search would be satisfactory to a user. The author tested and compared four major Web search engines, using the most sophisticated search techniques available. Thirty-nine sites were selected and searched by title, and ranked according to the relevance and order of the displayed results. 相似文献
23.
《国际互联网参考资料服务季刊》2013,18(1):47-62
ABSTRACT Many libraries recognize the need to create Web sites accessible to users with disabilities, as legislated in U.S. Code Section 508, but Section 508 compliance defines a minimum legal level of accessibility. The same technology that can make a Web site available to users with disabilities can also make the site available to users with wireless devices, such as PDAs and cell phones, with Internet access. To bring about “maximum accessibility,” library Web designers need to implement Web standards. This article argues the place to begin implementing these standards is with an accessibility statement which serves as both a contract and a navigational aid. 相似文献
24.
W. Hui P.J.-H. Hu † T.H.K. Clark ‡ K.Y. Tam‡ & J. Milton§ 《Journal of Computer Assisted Learning》2008,24(3):245-259
Abstract A field experiment compares the effectiveness and satisfaction associated with technology-assisted learning with that of face-to-face learning. The empirical evidence suggests that technology-assisted learning effectiveness depends on the target knowledge category. Building on Kolb's experiential learning model, we show that technology-assisted learning improves students' acquisition of knowledge that demands abstract conceptualization and reflective observation but adversely affects their ability to obtain knowledge that requires concrete experience. Technology-assisted learning better supports vocabulary learning than face-to-face learning but is comparatively less effective in developing listening comprehension skills. In addition, according to empirical tests, perceived ease of learning and learning community support significantly predict both perceived learning effectiveness and learning satisfaction. Overall, the results support our hypotheses and research model and suggest instructors should consider the target knowledge when considering technology-assisted learning options or designing a Web-based course. In addition, a supportive learning community can make technology-assisted learning easier for students and increase their learning satisfaction. 相似文献
25.
26.
A. V. Nesterov 《Automatic Documentation and Mathematical Linguistics》2009,43(3):132-137
A model is built of semantic triangle characterized by its universal nature: it is suitable not only for the elements of the real world but also for any elements of the Universe. Various possibilities of the development of the given model are shown, including a dialectic triangle. 相似文献
27.
Andrew Brampton Andrew MacQuire Michael Fry Idris A. Rai Nicholas J. P. Race Laurent Mathy 《Multimedia Systems》2009,15(1):3-17
This paper presents a detailed characterisation of user behaviour for a series of interactive video experiments over a 12
month period, in which we served popular sporting and musical content. In addition to generic VCR-like features, our custom-built
video-on-demand application provides advanced interactivity features such as bookmarking. The dramatic impact of such functionality
on how users consume content is studied and analysed. We discuss in detail how this user behaviour can be exploited by content
distributors to improve user experience. Specifically, we study how simple dynamic bookmark placement and interactivity-aware
content pre-fetching and replication can reduce the impact of highly interactive media on CDN performance. 相似文献
28.
29.
Web站点的超链结构挖掘 总被引:11,自引:0,他引:11
阳小华 《计算机工程与应用》2001,37(8):64-65
WWW是一个由成千上万个分布在世界各地的Web站点组成的全球信息系统,每个Web站点又是一个由许多Web页构成的信息(子)系统。由于一个文档作者可以通过超链把自己的文档与任意一个已知的Web页链接起来,而一个 Web站点上的信息资源又通常是由许多人共同提供的, 因此 Web站点内的超链链接通常是五花八门、各种各样的,它们可以有各种含义和用途。文章分析了WWW系统中超链的使用特征和规律,提出了一个划分超链类型、挖掘站点结构的方法,初步探讨了它在信息收集和查询等方面的应用。 相似文献
30.
面向ASP模式的塑料注射成型CAE系统 总被引:2,自引:0,他引:2
随着Internet和电子商务的迅猛发展,一种应用软件的新模式:ASP也逐渐凸现。文章构造了一个面向ASP基于Web的远程塑料注射成型CAE系统,详细介绍了系统的构造方法和关键技术。 相似文献