全文获取类型
收费全文 | 1612篇 |
免费 | 191篇 |
国内免费 | 130篇 |
专业分类
电工技术 | 42篇 |
综合类 | 184篇 |
化学工业 | 233篇 |
金属工艺 | 24篇 |
机械仪表 | 90篇 |
建筑科学 | 189篇 |
矿业工程 | 28篇 |
能源动力 | 11篇 |
轻工业 | 74篇 |
水利工程 | 17篇 |
石油天然气 | 24篇 |
武器工业 | 12篇 |
无线电 | 201篇 |
一般工业技术 | 82篇 |
冶金工业 | 36篇 |
原子能技术 | 4篇 |
自动化技术 | 682篇 |
出版年
2024年 | 5篇 |
2023年 | 32篇 |
2022年 | 137篇 |
2021年 | 121篇 |
2020年 | 70篇 |
2019年 | 57篇 |
2018年 | 30篇 |
2017年 | 47篇 |
2016年 | 66篇 |
2015年 | 63篇 |
2014年 | 103篇 |
2013年 | 58篇 |
2012年 | 127篇 |
2011年 | 103篇 |
2010年 | 89篇 |
2009年 | 88篇 |
2008年 | 102篇 |
2007年 | 83篇 |
2006年 | 91篇 |
2005年 | 65篇 |
2004年 | 68篇 |
2003年 | 68篇 |
2002年 | 37篇 |
2001年 | 23篇 |
2000年 | 32篇 |
1999年 | 27篇 |
1998年 | 16篇 |
1997年 | 24篇 |
1996年 | 10篇 |
1995年 | 16篇 |
1994年 | 14篇 |
1993年 | 18篇 |
1992年 | 12篇 |
1991年 | 3篇 |
1989年 | 3篇 |
1988年 | 1篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1983年 | 4篇 |
1982年 | 4篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1960年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有1933条查询结果,搜索用时 15 毫秒
1.
《International Journal of Hydrogen Energy》2020,45(7):4793-4803
As an industrial pollutant, tar derived from biomass gasification is used as the precursor for fabricating a novel carbon-metal hydroxides composite electrode. A slurry (the mixture of tar, KOH and melamine) is daubed uniformly onto the nickel foam, which is directly carbonized to form NPC@LDH electrode material. This electrode is further coated with NiCo-LDH nanosheets using an electrodeposition method to form NF@NPC@LDH. The newly made NF@NPC@LDH electrode exhibits a high specific capacity of 9.6 F cm−2 at a current density of 2 mA cm−2 and good rate performance (55.3% retention). Furthermore, a hybrid NF@NPC@LDH//NF@PC all-solid-state supercapacitor is fabricated, and the device exhibits high energy density of 1.28 mWh cm−3 at a power density of 8.04 mW cm−3, low resistance and good cycling stability. 相似文献
2.
Julia Flanders 《Language Resources and Evaluation》1997,31(4):301-310
This paper discusses the contested role of images in electronic editions, and summarizes some of the chief arguments for their
inclusion. I then argue that, to truly determine the importance of images to the function of electronic editions, we must
understand the contribution the image makes to the form of textual knowledge provided by the edition. I suggest a distinction
between editions which are primarily pedagogical in their aims, those which aim above all at scholarly authority, and those
which attempt to provide textual information as high-quality data which can be analysed and processed. I conclude that the
latter represents the most significant future trend in electronic editing.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
3.
Adelino Santos 《计算机科学技术学报》1993,8(3):67-79
CoMEdiA is a groupware tool which enables co-authors to cooperatively produce hypermedia documents.CoMEdiA allows co-authors to communicate their ideas,drafts,guidelines,constraints and annotations to other co-authors.In uses a mix of communication patterns,media and document organization to enable co-authors to keep on exchanging information(remotely or face-to-face),improving passages and modifying notes until a final document is achieved.We did not concentrate on th depth but on the breath of the features.Our efforts were on integrating and corrdinating concepts from collaboration,multimedia and hyper organization rather than on making a specialized system in any of them.We began with the text medium and are now including bitmaps and raster images.Later sound and video will also be integrated.In this paper we describe and sustain the available capacites. 相似文献
4.
Long-Wen Chang Shui-kung Chuag Shang-shung Yu 《Multidimensional Systems and Signal Processing》1994,5(3):319-330
The compression of Chinese characters is very important for Chinese office automation and desktop publishing. In this paper, various methods are used to compress 13,051 Chinese characters losslessly by coding their skeleton points. The skeleton points are composed of isolated points and curves. To trace every point in a curve once and consecutively is a NP problem. Therefore, we use contour path following and revisiting algorithms to trace skeleton curves with chain codes. The remaining isolated skeleton points are encoded by an Elias code. Our coding method has a better compression rate than that of conventional skeleton coding. 相似文献
5.
从RS—232C,RS—422接口标准及RS—232C与RS—422的电平转换等方面详细地介绍非线性设备与编辑录像机遥控部分的硬件接口技术,给出了相关的电路原理图,指出了使用时的一些注意事项。 相似文献
6.
7.
期刊稿件网络采编系统的建立 总被引:3,自引:0,他引:3
《中国冶金》杂志社全面启用的科技期刊稿件采编系统是以Internet为载体,具有作者在线投稿、在线查询、上传校样、专家在线审理稿件、提交审稿意见、上传审改稿、编辑在线加工处理稿件等作用,完全实现了稿件从收稿到发稿的全程数字化管理,同时建立了数据齐全、操作简便的作者、审稿专家和稿件的数据库,改进了传统的操作方法和管理模式,提高了工作效率。杂志社采用该系统还可以进行网刊发布、管理以及期刊征订和发行处理。 相似文献
8.
9.
Richard L. Venezky 《Computers and the Humanities》1988,22(4):285-291
The Dictionary of Old English computing systems have provided access since the 1970s to a database of approximately three million running words. These systems, designed for a variety of machines and written in a variety of languages, have until recently been planned with computing center billing algorithms in mind. With personal workstations emphasis has shifted to building more elegant user interfaces and to providing the entire DOE database to editors around the world. While the shift from sequential files to random access files and the provision of extensive development tools have changed some of the design process, error checking and protection of the database against accidental intrusion have remained as central issues.Richard L. Venezky is Unidel Professor of Educational Studies and professor of Computer and Information Sciences at the University of Delaware. He was formerly professor and chair of Computer Sciences at the University of Wisconsin. His research interests include writing systems, literacy, knowledge representation, and computer-assisted instruction. Among his recent publications are The Subtle Danger: Reflections on the Literacy Abilities of America's Young Adults (Princeton, NJ: ETS, 1987), and Steps Towards a Modern History of American Reading Instruction (Review of Research in Education, 1986, vol. 13, 129–70). 相似文献
10.