全文获取类型
收费全文 | 11692篇 |
免费 | 277篇 |
国内免费 | 120篇 |
专业分类
电工技术 | 278篇 |
综合类 | 174篇 |
化学工业 | 642篇 |
金属工艺 | 500篇 |
机械仪表 | 192篇 |
建筑科学 | 192篇 |
矿业工程 | 65篇 |
能源动力 | 99篇 |
轻工业 | 351篇 |
水利工程 | 56篇 |
石油天然气 | 180篇 |
武器工业 | 34篇 |
无线电 | 538篇 |
一般工业技术 | 382篇 |
冶金工业 | 163篇 |
原子能技术 | 115篇 |
自动化技术 | 8128篇 |
出版年
2024年 | 13篇 |
2023年 | 83篇 |
2022年 | 146篇 |
2021年 | 174篇 |
2020年 | 118篇 |
2019年 | 76篇 |
2018年 | 75篇 |
2017年 | 124篇 |
2016年 | 95篇 |
2015年 | 148篇 |
2014年 | 356篇 |
2013年 | 335篇 |
2012年 | 968篇 |
2011年 | 2485篇 |
2010年 | 1305篇 |
2009年 | 1107篇 |
2008年 | 813篇 |
2007年 | 715篇 |
2006年 | 591篇 |
2005年 | 667篇 |
2004年 | 587篇 |
2003年 | 617篇 |
2002年 | 316篇 |
2001年 | 39篇 |
2000年 | 34篇 |
1999年 | 31篇 |
1998年 | 14篇 |
1997年 | 17篇 |
1996年 | 11篇 |
1995年 | 7篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 1篇 |
1987年 | 1篇 |
1982年 | 2篇 |
1980年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Jianmou Lu Yanli Huang Shunyan Ren 《International Journal of Control, Automation and Systems》2020,18(5):1250-1263
This paper investigates the general decay synchronization and general decay H∞ synchronization problems of multi-weighted coupled reaction-diffusion 相似文献
2.
3.
4.
针对石油化工生产的特点,从物料特性、上艺装置、工艺控制参数、防火防爆安全装置、作业性质和消防安全设施等几方面综合分析其火灾危险性,并提出相应的防范措施,为消防安全评价提供依据。 相似文献
5.
Navab SinghAuthor Vitae Moitreyee Mukherjee-RoyAuthor VitaeSohan Singh MehtaAuthor Vitae 《Microelectronics Journal》2003,34(4):237-245
The patterning of contact holes by selecting out-of-focus image plane (defocus) using attenuated phase shift masks (APSM) has been studied. Defocus is found to enhance the image modulation at low partial coherence for contact holes with negative local average of mask function. Semi-dense holes up to 130 nm in 8% APSM have been printed by 0.5 μm defocus at a partial coherence of 0.31 using KrF scanner with highest numerical aperture of 0.68. However, these holes were closed with in-focus imaging. Defocus is also found to be beneficial for patterning the pitches that have extensive side lobes with in-focus imaging. 相似文献
6.
HDI工艺中取代涂树脂铜箔适合激光钻孔的半固化片 总被引:1,自引:1,他引:0
应用于HDI的激光钻孔半固化片的方法和其它常规材料相比具有的优缺点。 相似文献
7.
8.
Adaptive motion control using neural network approximations 总被引:1,自引:0,他引:1
In this paper, we present a new adaptive technique for tracking control of mechanical systems in the presence of friction and periodic disturbances. Radial Basis Functions (RBFs) are used to compensate for the effects of nonlinearly occurring parameters in the friction and periodic disturbance model. Theoretical analysis, such as stability and transient performance, is provided. Furthermore, the performance of the adaptive RBF controller and its non-adaptive counterpart are compared. 相似文献
9.
Cherng-Min MaAuthor Vitae 《Pattern recognition》2003,36(8):1775-1782
Generally, a reduction operation (e.g., thinning and shrinking) on 3D binary images can be represented as a set of reduction templates where every object voxel of the image satisfying any template is turned to a background voxel. Generally, it is rather difficult, error-prone and time-consuming for verifying the topological soundness of a 3D parallel reduction operation. This paper proposes sufficient conditions of time complexity O(n) for verifying the topological soundness of 3D parallel 6-subiteration reduction operations of n templates where such a kind of 3D reduction operations is performed alternatively from the six orthogonal directions to turn object voxels to background voxels. By such sufficient conditions, the topology soundness of a 3D 6-subiteration parallel reduction operation can be verified by checking each and every of its templates. 相似文献
10.
In this paper, we present a control methodology for a class of discrete time nonlinear systems that depend on a possibly exogenous scheduling variable. This class of systems consists of an interpolation of nonlinear dynamic equations in strict feedback form, and it may represent systems with a time-varying nonlinear structure. Moreover, this class of systems is able to represent some cases of gain scheduling control, Takagi-Sugeno fuzzy systems, as well as input-output realizations of nonlinear systems which are approximated via localized linearizations. We present two control theorems, one using what we call a “global” approach (akin to traditional backstepping), and a “local” approach, our main result, where backstepping is again used but the control law is an interpolation of local control terms. An aircraft wing rock regulation problem with varying angle of attack is used to illustrate and compare the two approaches. 相似文献