全文获取类型
收费全文 | 8664篇 |
免费 | 1520篇 |
国内免费 | 1144篇 |
专业分类
电工技术 | 559篇 |
综合类 | 1139篇 |
化学工业 | 268篇 |
金属工艺 | 484篇 |
机械仪表 | 835篇 |
建筑科学 | 302篇 |
矿业工程 | 99篇 |
能源动力 | 179篇 |
轻工业 | 148篇 |
水利工程 | 50篇 |
石油天然气 | 390篇 |
武器工业 | 91篇 |
无线电 | 1609篇 |
一般工业技术 | 909篇 |
冶金工业 | 261篇 |
原子能技术 | 60篇 |
自动化技术 | 3945篇 |
出版年
2024年 | 85篇 |
2023年 | 222篇 |
2022年 | 353篇 |
2021年 | 444篇 |
2020年 | 434篇 |
2019年 | 324篇 |
2018年 | 267篇 |
2017年 | 339篇 |
2016年 | 332篇 |
2015年 | 401篇 |
2014年 | 578篇 |
2013年 | 555篇 |
2012年 | 745篇 |
2011年 | 740篇 |
2010年 | 622篇 |
2009年 | 625篇 |
2008年 | 638篇 |
2007年 | 643篇 |
2006年 | 528篇 |
2005年 | 466篇 |
2004年 | 356篇 |
2003年 | 319篇 |
2002年 | 262篇 |
2001年 | 206篇 |
2000年 | 143篇 |
1999年 | 127篇 |
1998年 | 125篇 |
1997年 | 79篇 |
1996年 | 89篇 |
1995年 | 55篇 |
1994年 | 51篇 |
1993年 | 30篇 |
1992年 | 25篇 |
1991年 | 17篇 |
1990年 | 25篇 |
1989年 | 23篇 |
1988年 | 12篇 |
1987年 | 8篇 |
1986年 | 4篇 |
1985年 | 6篇 |
1984年 | 5篇 |
1983年 | 6篇 |
1982年 | 7篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1975年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Youngjean Jung Panayiotis Papadopoulos R. O. Ritchie 《International journal for numerical methods in engineering》2004,60(2):429-460
This work concerns the micromechanical constitutive modelling, algorithmic implementation and numerical simulation of polycrystalline superelastic alloys under multiaxial loading. The model is formulated in finite deformations and incorporates the effect of texture. The numerical implementation is based on the constrained minimization of the Helmholtz free energy with dissipation. Simulations are conducted for thin tubes of Nitinol under tension–torsion, as well as for a simplified model of a biomedical stent. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
2.
Modern methods of determining fracture resistance are analyzed. The necessity of developing a crucially new method based on edge chipping of a brittle material is shown. The results of experimental studies are presented. The applicability of the method to the comparative fracture resistance evaluation of ceramics is substantiated. 相似文献
3.
Joon C. Park Author Vitae Author Vitae 《Computer aided design》2003,35(9):807-812
Presented in this paper is a topology reconstruction algorithm from a set of unorganized trimmed surfaces. Error-prone small geometric elements are handled to give proper topological information. It gives complete topology to topologically complete models, and it is also tolerant to incomplete models. The proposed algorithm is vertex-based in that clues for topological information are searched from the set of vertices first, not from that of edges. 相似文献
4.
5.
An elastic half plane with an oblique edge crack is considered in this paper. A pair of concentrated forces or point dislocations is assumed to act at an arbitrary point in the half plane. The half plane with an edge crack is first mapped into a unit circle by a rational mapping function so that the following analysis can be carried out on the mapped plane analytically. Then the complex stress functions are derived by separating the whole problem into two parts; one is the principal part corresponding to the infinite plane acted on by concentrated forces or dislocations, the other is the holomorphic part, which can be determined by making use of the property of regularity of complex stress functions. The stress intensity factors of the crack can be calculated with different inclined angles of the crack, and the displacement and stress components at an arbitrary position in the half plane can be expressed explicitly. 相似文献
6.
7.
The development of future mobile networks will be driven, in large part, by content and web based services. In this paper,
we examine several performance, scalability and architectural challenges faced by future mobile web applications and how advanced
mobile content delivery techniques can address these challenges. We review existing content delivery using a taxonomy that
consists of three categories: network scaling, end system acceleration, and content and protocol optimization. While wireline
content delivery focuses on network and server scalability, mobile content delivery will likely benefit most from optimizing
radio link usage. We also present our ongoing work in this area, which extends the functionality of edge caching to the terminal,
uses user interest correlation information to maintain low terminal power consumption and adds a new dimension to radio resource
management.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
8.
9.
10.
主要论述了采用图像边缘检测和图像跟踪算法对采集的关节镜图像进行图像处理和分析的过程。在图像处理的基础上,系统自动测量出指定目标的形状参数,实现了系统的测量要求。本研究为实现关节镜手术过程图像的保存和手术的准确性提供了可行的方法。 相似文献