全文获取类型
收费全文 | 2463篇 |
免费 | 144篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 26篇 |
综合类 | 1篇 |
化学工业 | 621篇 |
金属工艺 | 41篇 |
机械仪表 | 58篇 |
建筑科学 | 73篇 |
矿业工程 | 2篇 |
能源动力 | 102篇 |
轻工业 | 169篇 |
水利工程 | 8篇 |
石油天然气 | 4篇 |
无线电 | 283篇 |
一般工业技术 | 490篇 |
冶金工业 | 126篇 |
原子能技术 | 13篇 |
自动化技术 | 591篇 |
出版年
2024年 | 2篇 |
2023年 | 28篇 |
2022年 | 35篇 |
2021年 | 67篇 |
2020年 | 62篇 |
2019年 | 53篇 |
2018年 | 73篇 |
2017年 | 64篇 |
2016年 | 90篇 |
2015年 | 63篇 |
2014年 | 103篇 |
2013年 | 178篇 |
2012年 | 185篇 |
2011年 | 230篇 |
2010年 | 176篇 |
2009年 | 149篇 |
2008年 | 146篇 |
2007年 | 151篇 |
2006年 | 103篇 |
2005年 | 88篇 |
2004年 | 69篇 |
2003年 | 50篇 |
2002年 | 54篇 |
2001年 | 49篇 |
2000年 | 34篇 |
1999年 | 40篇 |
1998年 | 57篇 |
1997年 | 39篇 |
1996年 | 21篇 |
1995年 | 17篇 |
1994年 | 17篇 |
1993年 | 17篇 |
1992年 | 21篇 |
1991年 | 10篇 |
1990年 | 13篇 |
1989年 | 6篇 |
1988年 | 4篇 |
1987年 | 9篇 |
1986年 | 6篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1979年 | 1篇 |
1978年 | 2篇 |
1977年 | 4篇 |
1976年 | 3篇 |
1975年 | 1篇 |
1970年 | 1篇 |
1956年 | 1篇 |
排序方式: 共有2608条查询结果,搜索用时 15 毫秒
61.
Olivier Le Maître 《Computers & Fluids》2009,38(8):1566-3099
We present a Newton method to compute the stochastic solution of the steady incompressible Navier-Stokes equations with random data (boundary conditions, forcing term, fluid properties). The method assumes a spectral discretization at the stochastic level involving a orthogonal basis of random functionals (such as Polynomial Chaos or stochastic multi-wavelets bases). The Newton method uses the unsteady equations to derive a linear equation for the stochastic Newton increments. This linear equation is subsequently solved following a matrix-free strategy, where the iterations consist in performing integrations of the linearized unsteady Navier-Stokes equations, with an appropriate time scheme to allow for a decoupled integration of the stochastic modes. Various examples are provided to demonstrate the efficiency of the method in determining stochastic steady solution, even for regimes where it is likely unstable. 相似文献
62.
63.
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
64.
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
65.
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
66.
Pierre Aubert Nicolas Di Césaré Olivier Pironneau 《Computing and Visualization in Science》2001,3(4):197-208
This work deals with an implementation of automatic differentiation of C++ computer programs in forward mode using operator overloading and expression templates. We report on the efficiency of such implementation and its obvious advantage : the ability to perform sensitivity analysis
without touching the source of the computer program by simply adding a library to it. We apply this tool to a flow control
problem : minimize the drag of a cylinder, in subsonic unsteady turbulent flow, by controlling the boundary condition of the
cylinder.
Received: 1 June 1999 / Accepted: 29 May 2000 相似文献
67.
68.
This paper introduces the use of sets of multiple networks (bundled networks) to manage the variability due to different initialization parameters. This method makes it statistically impossible for the networks to be trapped in the same local minimum, and therefore allows better control of the confidence of the prediction eventually given. The spread of the forecasts given by these different networks can be used for prediction reliability purposes. An illustration of this usage is given with the El Niño phenomenon. 相似文献
69.
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
70.
Nawal Guermouche Olivier Perrin Christophe Ringeissen 《Electronic Notes in Theoretical Computer Science》2008,200(3):155
Web services are becoming one of the main technologies for designing and building complex inter-enterprise business applications. Usually, a business application cannot be fulfilled by one Web service but by coordinating a set of them. In particular, to perform a coordination, one of the important investigations is the compatibility analysis. Two Web services are said compatible if they can interact correctly. In the literature, the proposed frameworks for the services compatibility checking rely on the supported sequences of messages. The interaction of services depends also on other properties, such that the exchanged data flow. Thus, considering only supported sequences of messages seems to be insufficient. Other properties on which the services interaction can rely on, are the temporal constraints. In this paper, we focus our interest on the compatibility analysis of Web services regarding their (1) supported sequences of messages, (2) the exchanged data flow, (3) constraints related to the exchanged data flow and (4) the temporal requirements. Based on these properties, we study three compatibility classes: (i) absolute compatibility, (ii) likely compatibility and (iii) absolute incompatibility. 相似文献