全文获取类型
收费全文 | 2683篇 |
免费 | 133篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 25篇 |
综合类 | 1篇 |
化学工业 | 652篇 |
金属工艺 | 46篇 |
机械仪表 | 63篇 |
建筑科学 | 81篇 |
矿业工程 | 3篇 |
能源动力 | 105篇 |
轻工业 | 185篇 |
水利工程 | 12篇 |
石油天然气 | 4篇 |
无线电 | 305篇 |
一般工业技术 | 513篇 |
冶金工业 | 198篇 |
原子能技术 | 11篇 |
自动化技术 | 613篇 |
出版年
2024年 | 2篇 |
2023年 | 30篇 |
2022年 | 43篇 |
2021年 | 67篇 |
2020年 | 63篇 |
2019年 | 55篇 |
2018年 | 75篇 |
2017年 | 63篇 |
2016年 | 93篇 |
2015年 | 66篇 |
2014年 | 106篇 |
2013年 | 186篇 |
2012年 | 200篇 |
2011年 | 241篇 |
2010年 | 181篇 |
2009年 | 155篇 |
2008年 | 153篇 |
2007年 | 159篇 |
2006年 | 105篇 |
2005年 | 94篇 |
2004年 | 73篇 |
2003年 | 52篇 |
2002年 | 55篇 |
2001年 | 59篇 |
2000年 | 35篇 |
1999年 | 46篇 |
1998年 | 80篇 |
1997年 | 45篇 |
1996年 | 34篇 |
1995年 | 20篇 |
1994年 | 22篇 |
1993年 | 22篇 |
1992年 | 20篇 |
1991年 | 14篇 |
1990年 | 14篇 |
1989年 | 10篇 |
1988年 | 6篇 |
1987年 | 11篇 |
1986年 | 6篇 |
1985年 | 2篇 |
1984年 | 6篇 |
1983年 | 5篇 |
1982年 | 7篇 |
1981年 | 6篇 |
1980年 | 3篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 10篇 |
1976年 | 5篇 |
1975年 | 4篇 |
排序方式: 共有2817条查询结果,搜索用时 15 毫秒
31.
32.
33.
Using online simulation in Holonic manufacturing systems 总被引:1,自引:1,他引:0
Olivier Cardin Pierre Castagna 《Engineering Applications of Artificial Intelligence》2009,22(7):1025-1033
This paper deals with the use of online simulation on Holonic manufacturing systems. Concepts needed for the use of online simulation in a classical hierarchical system were already defined, the observer being the central one. The behavior's differences between both classes of systems are studied to determine the best way to adapt these concepts to this new environment. In the product resource order staff approach (PROSA) reference architecture, staff holons were chosen to welcome the simulation models and the observer. An application on an industrial sized Holonic manufacturing system is described to demonstrate the validity of the approach. 相似文献
34.
It is shown that, for any time-invariant exponentially stable linear system with additive disturbances, time-varying exponentially stable interval observers can be constructed. The technique of construction relies on the Jordan canonical form that any real matrix admits and on time-varying changes of coordinates for elementary Jordan blocks which lead to cooperative linear systems. The approach is applied to detectable linear systems. 相似文献
35.
Olivier Kerbrat Pascal Mognol Jean-Yves HascoëtAuthor vitae 《Computers in Industry》2011,62(7):684-692
Design for manufacturing (DFM) approaches aim to integrate manufacturability aspects during the design stage. Most of DFM approaches usually consider only one manufacturing process, but product competitiveness may be improved by designing hybrid modular products, in which products are seen as 3-D puzzles with modules realized individually by the best manufacturing process and further gathered. A new DFM system is created in order to give quantitative information during the product design stage of which modules will benefit in being machined and which ones will advantageously be realized by an additive process (such as Selective Laser Sintering or laser deposition). A methodology for a manufacturability evaluation in case of a subtractive or an additive manufacturing process is developed and implemented in a CAD software. Tests are carried out on industrial products from automotive industry. 相似文献
36.
Shih-Ying LinShi-Jinn Horng Tzong-Wann KaoChin-Shyurng Fahn Pingzhi FanYuan-Hsin Chen Muhammad Khurram KhanAnu Bourgeois Takao Terano 《Image and vision computing》2011,29(4):272-285
Traditionally, the block-based medial axis transform (BB-MAT) and the chessboard distance transform (CDT) were usually viewed as two completely different image computation problems, especially for three dimensional (3D) space. In fact, there exist some equivalent properties between them. The relationship between both of them is first derived and proved in this paper. One of the significant properties is that CDT for 3D binary image V is equal to BB-MAT for image V' where it denotes the inverse image of V. In a parallel algorithm, a cost is defined as the product of the time complexity and the number of processors used. The main contribution of this work is to reduce the costs of 3D BB-MAT and 3D CDT problems proposed by Wang [65]. Based on the reverse-dominance technique which is redefined from dominance concept, we achieve the computation of the 3D CDT problem by implementing the 3D BB-MAT algorithm first. For a 3D binary image of size N3, our parallel algorithm can be run in O(logN) time using N3 processors on the concurrent read exclusive write (CREW) parallel random access machine (PRAM) model to solve both 3D BB-MAT and 3D CDT problems, respectively. The presented results for the cost are reduced in comparison with those of Wang's. To the best of our knowledge, this work is the lowest costs for the 3D BB-MAT and 3D CDT algorithms known. In parallel algorithms, the running time can be divided into computation time and communication time. The experimental results of the running, communication and computation times for the different problem sizes are implemented in an HP Superdome with SMP/CC-NUMA (symmetric multiprocessor/cache coherent non-uniform memory access) architecture. We conclude that the parallel computer (i.e., SMP/CC-NUMA architecture or cluster system) is more suitable for solving problems with a large amount of input size. 相似文献
37.
38.
In this study, the effect of the centrifugal forces on the eigenvalue solution obtained using two different nonlinear finite
element formulations is examined. Both formulations can correctly describe arbitrary rigid body displacements and can be used
in the large deformation analysis. The first formulation is based on the geometrically exact beam theory, which assumes that the cross section does not deform in its own plane and remains plane after deformation. The second formulation,
the absolute nodal coordinate formulation (ANCF), relaxes this assumption and introduces modes that couple the deformation of the cross section and the axial and bending
deformations. In the absolute nodal coordinate formulation, four different models are developed; a beam model based on a general
continuum mechanics approach, a beam model based on an elastic line approach, a beam model based on an elastic line approach
combined with the Hellinger–Reissner principle, and a plate model based on a general continuum mechanics approach. The use
of the general continuum mechanics approach leads to a model that includes the ANCF coupled deformation modes. Because of these modes, the continuum mechanics model differs from the models based on the elastic line approach. In both
the geometrically exact beam and the absolute nodal coordinate formulations, the centrifugal forces are formulated in terms
of the element nodal coordinates. The effect of the centrifugal forces on the flap and lag modes of the rotating beam is examined, and the results obtained using the two formulations are compared for different values of
the beam angular velocity. The numerical comparative study presented in this investigation shows that when the effect of some
ANCF coupled deformation modes is neglected, the eigenvalue solutions obtained using the geometrically exact beam and the
absolute nodal coordinate formulations are in a good agreement. The results also show that as the effect of the centrifugal
forces, which tend to increase the beam stiffness, increases, the effect of the ANCF coupled deformation modes on the computed
eigenvalues becomes less significant. It is shown in this paper that when the effect of the Poisson ration is neglected, the
eigenvalue solution obtained using the absolute nodal coordinate formulation based on a general continuum mechanics approach
is in a good agreement with the solution obtained using the geometrically exact beam model. 相似文献
39.
International Journal of Computer Vision - 相似文献
40.
Training a support vector machine in the primal 总被引:3,自引:0,他引:3
Chapelle O 《Neural computation》2007,19(5):1155-1178
Most literature on support vector machines (SVMs) concentrates on the dual optimization problem. In this letter, we point out that the primal problem can also be solved efficiently for both linear and nonlinear SVMs and that there is no reason for ignoring this possibility. On the contrary, from the primal point of view, new families of algorithms for large-scale SVM training can be investigated. 相似文献