全文获取类型
收费全文 | 8926篇 |
免费 | 493篇 |
国内免费 | 482篇 |
专业分类
电工技术 | 215篇 |
综合类 | 299篇 |
化学工业 | 81篇 |
金属工艺 | 396篇 |
机械仪表 | 1346篇 |
建筑科学 | 241篇 |
矿业工程 | 122篇 |
能源动力 | 76篇 |
轻工业 | 40篇 |
水利工程 | 17篇 |
石油天然气 | 26篇 |
武器工业 | 103篇 |
无线电 | 815篇 |
一般工业技术 | 347篇 |
冶金工业 | 28篇 |
原子能技术 | 43篇 |
自动化技术 | 5706篇 |
出版年
2024年 | 7篇 |
2023年 | 128篇 |
2022年 | 97篇 |
2021年 | 130篇 |
2020年 | 304篇 |
2019年 | 232篇 |
2018年 | 188篇 |
2017年 | 177篇 |
2016年 | 209篇 |
2015年 | 239篇 |
2014年 | 498篇 |
2013年 | 400篇 |
2012年 | 512篇 |
2011年 | 635篇 |
2010年 | 404篇 |
2009年 | 447篇 |
2008年 | 511篇 |
2007年 | 661篇 |
2006年 | 701篇 |
2005年 | 685篇 |
2004年 | 610篇 |
2003年 | 538篇 |
2002年 | 441篇 |
2001年 | 328篇 |
2000年 | 207篇 |
1999年 | 208篇 |
1998年 | 118篇 |
1997年 | 67篇 |
1996年 | 45篇 |
1995年 | 40篇 |
1994年 | 26篇 |
1993年 | 23篇 |
1992年 | 6篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1988年 | 3篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 4篇 |
1981年 | 4篇 |
1980年 | 3篇 |
1979年 | 3篇 |
1977年 | 3篇 |
1975年 | 3篇 |
1974年 | 1篇 |
1973年 | 3篇 |
排序方式: 共有9901条查询结果,搜索用时 406 毫秒
31.
In this paper, we present the findings from an extensive study of the use of virtual reality (VR) models in large construction projects. The study includes two parts: The first part presents a quantitative questionnaire designed to investigate how VR models are experienced and assessed by the workforce at a building site. The second part includes a qualitative field survey of how VR models can be applied and accepted by professionals in the design and planning process of a large pelletizing plant. Through mainly studying persons who had little or no experience with advanced information technology (IT), we hoped to reveal the attitudes of the average person working at a construction site rather than of an IT expert. In summary, the study shows that the VR models in both projects have been very useful and well accepted by the users. Today’s information flow is, from a general point of view, considered to be insufficient and the hypothesis is that using VR models in the construction process have the potential to minimize waste of resources and improve the final result. 相似文献
32.
33.
(Department of Automation & Computer Baotou Iron &Steel Instetute Baotou PRC) Wang ZhichunLi Wentao(Department of Net work Baotou Filiale of Inner MongoliaMobile Corporation Baotou PRC)Yang Zhanping 《微计算机信息》2003,19(5):45-45
This paper introduces hardware connections between computer and intellectualized instrument based on 89c51 sin-glechip .It gives the techniques to compile internet applications of Virtual Instruments with Delphi6. 相似文献
34.
虚拟企业模型并行仿真研究 总被引:4,自引:0,他引:4
随着各种全新的制造理念,特别是虚拟企业的出现,企业模型的规模不断扩大,使目前存在的大多数企业模型仿真系统的效率大大下降。该文针对此问题,通过深入分析虚拟企业模型结构,并在已有的构件化企业建模体系CEMS及其仿真系统的基础上,结合异步仿真技术和多线程技术提出了一种分层式企业模型仿真体系结构,为虚拟企业模型的快速高效的仿真提供了一种有效的方法。 相似文献
35.
36.
Java语言及其虚拟机技术探讨 总被引:1,自引:0,他引:1
随着Internet的迅猛发展,Internet编程语言Java愈来愈成为计算机行业的焦点。本文在简述了Java的主要特点后,重点对Java最关键的技术──虚拟机进行了深入的探讨。 相似文献
37.
38.
SHIHongju SHIYongji 《半导体光子学与技术》1998,4(4):197-208,234
The liquid crystal televison spatia light modulator(LCTVSLM)characterized is usable in optical processing applications.e.g.,optical pattern recognition,associative memory,optical computing,correlation detection and optical data processing systems.The array performance and real-time optical correlation applications are reviewed. 相似文献
39.
Numerical simulations of acoustic scattering in the frequency domain based on hybrid methods coupling finite elements and boundary elements are the most suited for dealing with problems involving wave propagation in inhomogeneous media. Furthermore, it is necessary to resort to high performance computing to effectively solve the large size problems. However, the direct coupling yields a linear system with a matrix which is partly dense and partly sparse and thus not adapted to high performance computing. To avoid this difficulty, we present a new iterative method constructed from a non overlapping domain decomposition technique. 相似文献
40.
We present a new post processing method of simulating depth of field based on accurate calculations of circles of confusion. Compared to previous work, our method derives actual scene depth information directly from the existing depth buffer, requires no specialized rendering passes, and allows easy integration into existing rendering applications. Our implementation uses an adaptive, two‐pass filter, producing a high quality depth of field effect that can be executed entirely on the GPU, taking advantage of the parallelism of modern graphics cards and permitting real time performance when applied to large numbers of pixels. 相似文献