全文获取类型
收费全文 | 1283篇 |
免费 | 121篇 |
国内免费 | 35篇 |
专业分类
电工技术 | 9篇 |
综合类 | 401篇 |
化学工业 | 122篇 |
金属工艺 | 11篇 |
机械仪表 | 42篇 |
建筑科学 | 39篇 |
矿业工程 | 8篇 |
能源动力 | 5篇 |
轻工业 | 27篇 |
水利工程 | 6篇 |
石油天然气 | 1篇 |
武器工业 | 6篇 |
无线电 | 207篇 |
一般工业技术 | 192篇 |
冶金工业 | 128篇 |
原子能技术 | 11篇 |
自动化技术 | 224篇 |
出版年
2024年 | 2篇 |
2023年 | 44篇 |
2022年 | 38篇 |
2021年 | 62篇 |
2020年 | 35篇 |
2019年 | 58篇 |
2018年 | 38篇 |
2017年 | 34篇 |
2016年 | 27篇 |
2015年 | 32篇 |
2014年 | 55篇 |
2013年 | 69篇 |
2012年 | 69篇 |
2011年 | 95篇 |
2010年 | 65篇 |
2009年 | 65篇 |
2008年 | 59篇 |
2007年 | 78篇 |
2006年 | 96篇 |
2005年 | 60篇 |
2004年 | 82篇 |
2003年 | 46篇 |
2002年 | 44篇 |
2001年 | 32篇 |
2000年 | 16篇 |
1999年 | 18篇 |
1998年 | 9篇 |
1997年 | 11篇 |
1996年 | 28篇 |
1995年 | 14篇 |
1994年 | 10篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1990年 | 7篇 |
1988年 | 3篇 |
1986年 | 2篇 |
1985年 | 2篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 2篇 |
1977年 | 2篇 |
1974年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1964年 | 1篇 |
1962年 | 3篇 |
1959年 | 4篇 |
1957年 | 1篇 |
1956年 | 2篇 |
1954年 | 1篇 |
排序方式: 共有1439条查询结果,搜索用时 15 毫秒
1.
2.
《Journal of the European Ceramic Society》2022,42(13):5893-5903
Technical ceramics exhibit exceptional high-temperature properties, but unfortunately their extreme crack sensitivity and high melting point make it challenging to manufacture geometrically complex structures with sufficient strength and toughness. Emerging additive manufacturing technologies enable the fabrication of large-scale complex-shape artifacts with architected internal topology; when such topology can be arranged at the microscale, the defect population can be controlled, thus improving the strength of the material. Here, ceramic micro-architected materials are fabricated using direct ink writing (DIW) of an alumina nanoparticle-loaded ink, followed by sintering. After characterizing the rheology of the ink and extracting optimal processing parameters, the microstructure of the sintered structures is investigated to assess composition, density, grain size and defect population. Mechanical experiments reveal that woodpile architected materials with relative densities of 0.38–0.73 exhibit higher strength and damage tolerance than fully dense ceramics printed under identical conditions, an intriguing feature that can be attributed to topological toughening. 相似文献
3.
4.
5.
在双光束激光直写系统中,衍射光变图像的光刻是逐像素点进行的.本文提出在该系统中采用狭缝获得光栅线来进行衍射图形的直写,利用一种改进的矢量文件格式,使平台沿着垂直光栅线的方向运动,获得连续的多光点同时直写,直写后的衍射光栅线是连续的,系统的运行效率是逐点光刻的几十倍.编写了与DXF文件的接口直写控制程序,给出了实验结果. 相似文献
6.
7.
Jonathan Alexander Author Vitae William P. Banks Author Vitae 《Computers and Composition》2004,21(3):273-293
In this introduction to a special issue of Computers and Composition, the authors critically review current literature on computer-assisted writing pedagogies that grapple with issues of sexuality. Although this body of work is small, it points to provocative ways to develop our students’ critical and rhetorical sensibilities about the constructions of sexuality in our culture. Further, such work innovatively addresses the place of networked communication technologies in the interrogation of such constructions. The authors conclude with both an introduction of the work in this special issue that addresses the intersection of sexuality studies and computer-assisted writing studies and with a call for additional work in this field. 相似文献
8.
9.
Coping with a serious and chronic illness poses unique challenges for individuals in helping professions. What techniques and resources can be used to help the helpers? A narrative framework using the process of externalizing the problem is presented as a potentially useful approach for psychotherapists experiencing a serious illness. The author describes her own experience with lupus and offers recommendations for therapists struggling to balance their professional responsibilities with their own personal needs. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
10.
Graziella Tonfoni 《Artificial Intelligence Review》1996,10(3-4):187-208
CPP-TRS (Tonfoni 1989–94) is both a methodology and a language. Through the methodology (CPP — Communicative Positioning Program) those invisible aspects of communication are identified and represented by the meta-language (TRS — Text Representation Systems), which complements natural language. CPP-TRS is a new paradigm which applies to any communicative context.Icons in CPP-TRS are not intended to represent words or sentences in order to substitute them; they are rather intended to represent visually what natural language does not convey naturally. The improvement of communication is a challenge of the present and the future: CPP-TRS is designed explicitly for it.The CPP-TRS system thus is able to support the user with a set of visual tools, that are specifically suited to structuring text and communicating effectively.The same tools can support communication very effectively in situations where ambiguity can highly compromise the final result.The system may be used in a way that is either opaque or transparent to the reader of the text.Author of CPP-TRS¢ and CPP-TRS¢ Applications Designer. 相似文献