全文获取类型
收费全文 | 6548篇 |
免费 | 274篇 |
国内免费 | 17篇 |
专业分类
电工技术 | 73篇 |
综合类 | 7篇 |
化学工业 | 1534篇 |
金属工艺 | 107篇 |
机械仪表 | 148篇 |
建筑科学 | 327篇 |
矿业工程 | 9篇 |
能源动力 | 226篇 |
轻工业 | 540篇 |
水利工程 | 61篇 |
石油天然气 | 26篇 |
武器工业 | 2篇 |
无线电 | 581篇 |
一般工业技术 | 1107篇 |
冶金工业 | 914篇 |
原子能技术 | 34篇 |
自动化技术 | 1143篇 |
出版年
2023年 | 67篇 |
2022年 | 107篇 |
2021年 | 173篇 |
2020年 | 123篇 |
2019年 | 125篇 |
2018年 | 175篇 |
2017年 | 157篇 |
2016年 | 192篇 |
2015年 | 160篇 |
2014年 | 223篇 |
2013年 | 406篇 |
2012年 | 366篇 |
2011年 | 428篇 |
2010年 | 325篇 |
2009年 | 369篇 |
2008年 | 353篇 |
2007年 | 367篇 |
2006年 | 262篇 |
2005年 | 253篇 |
2004年 | 204篇 |
2003年 | 183篇 |
2002年 | 157篇 |
2001年 | 105篇 |
2000年 | 111篇 |
1999年 | 107篇 |
1998年 | 104篇 |
1997年 | 111篇 |
1996年 | 80篇 |
1995年 | 100篇 |
1994年 | 87篇 |
1993年 | 63篇 |
1992年 | 64篇 |
1991年 | 31篇 |
1990年 | 46篇 |
1989年 | 65篇 |
1988年 | 49篇 |
1987年 | 37篇 |
1986年 | 51篇 |
1985年 | 57篇 |
1984年 | 44篇 |
1983年 | 54篇 |
1982年 | 35篇 |
1981年 | 35篇 |
1980年 | 32篇 |
1979年 | 26篇 |
1978年 | 19篇 |
1977年 | 17篇 |
1976年 | 24篇 |
1975年 | 29篇 |
1974年 | 22篇 |
排序方式: 共有6839条查询结果,搜索用时 15 毫秒
951.
Ilya Simanovskii Antonio Viviani Frank Dubois Patrick Queeckers 《Microgravity science and technology》2018,30(3):243-256
Nonlinear convective flows developed under the joint action of buoyant and thermocapillary effects in a laterally heated two-layer system filling the closed cavity, have been investigated. The influence of a temperature-dependent interfacial heat release/consumption on nonlinear steady and oscillatory regimes, has been studied. It is shown that sufficiently strong temperature dependence of interfacial heat sinks and heat sources can change the sequence of bifurcations and lead to the development of specific oscillatory regimes in the system. 相似文献
952.
Khadija El Cheikh Chafika Djelal Yannick Vanhove Patrick Pizette Sébastien Rémond 《Advanced Powder Technology》2018,29(1):130-141
Wall roughness plays a crucial role in granular medium - rough wall interface friction. In this study, an experimental device has been designed to study the influence of boundary conditions, more specifically wall roughness, on the behavior of sheared granular medium. The study is based on use of an analog model, and consists of simulating roughness by means of notches and grains in the medium by monodisperse beads and on use of a numerical model based on the discrete element method. The test protocol entails displacing at fixed speed notched rods under confined granular medium. Movement of the beads layer near the rods as well as friction of the beads against the rods are both studied herein. Results indicate that the parameter controlling friction at the granular medium - rough wall interface is primarily the depth of beads embedment in surface asperities. The objective of the associated numerical modeling is to supplement the experimental results. 相似文献
953.
Marlon Wesley Machado Cunico Dalton Alexandre Kai Patrick Medeiros Cavalheiro Jonas de Carvalho 《Virtual and Physical Prototyping》2019,14(1):37-52
In recent years, additive manufacturing technologies have been playing an important role in the global economy. Consequently, low-cost 3D printers rose in the domestic environment, accelerating the development of startup companies and new market segments. Nevertheless, with regard to 3D printing based on fused filament fabrication, several challenges still need to be overcome, such as those related to surface finishing and mechanical strength. Moreover, 3D printing in the domestic environment also generates untreated plastic waste, which can cause environmental problems. For these reasons, the main goal of this work is to introduce and characterise 3D printing surface finishing post-processing using recycled plastic waste. As the main results of this work, the proposed recycling process was confirmed to improve object properties. Whereas surface roughness was reduced from 27 to 3?µm, while mechanical strength was increased in 20 times. The application of recycled material for chemical welding was also seen to be feasible. 相似文献
954.
Patrick J. Golden Ashley Whitney‐Rawls Sushant K. Jha W. John Porter III Dennis Buchanan Kartik Prasad Vivek Chandravanshi Vikas Kumar Reji John 《Fatigue & Fracture of Engineering Materials & Structures》2019,42(3):674-685
The objective of this work was to develop and demonstrate a probabilistic life prediction method for the prediction of minimum fatigue lives that are typically used in the design of fracture critical rotating turbine engine components. A Monte Carlo analysis was used to predict the variability in fatigue lives based on the distribution of microstructural features that lead to early crack initiation as well as the variability in small fatigue crack growth rates. Two titanium alloys, both with bimodal microstructures, were tested and analysed in this study. The distribution of critical microstructural features was calibrated based on test results and understanding of microstructure neighbourhood effects. Testing was conducted on both alloys and included both smooth and notched specimens. The predictions are presented and compared with the data for smooth and notch geometries for the various loading conditions. A parametric study was performed to identify the importance of several model inputs and to identify areas for future improvement. 相似文献
955.
Marc Josien Yves‐Patrick Pellegrini Frédéric Legoll Claude Le Bris 《International journal for numerical methods in engineering》2018,113(12):1827-1850
This work addresses the numerical approximation of solutions to a dimensionless form of the Weertman equation, which models a steadily moving dislocation and is an important extension (with advection term) of the celebrated Peierls‐Nabarro equation for a static dislocation. It belongs to the class of nonlinear reaction‐advection‐diffusion integro‐differential equations with Cauchy‐type kernel, thus involving an integration over an unbounded domain. In the Weertman problem, the unknowns are the shape of the core of the dislocation and the dislocation velocity. The proposed numerical method rests on a time‐dependent formulation that admits the Weertman equation as its long‐time limit. Key features are (1) time iterations are conducted by means of a new, robust, and inexpensive Preconditioned Collocation Scheme in the Fourier domain, which allows for explicit time evolution but amounts to implicit time integration, thus allowing for large time steps; (2) as the integration over the unbounded domain induces a solution with slowly decaying tails of important influence on the overall dislocation shape, the action of the operators at play is evaluated with exact asymptotic estimates of the tails, combined with discrete Fourier transform operations on a finite computational box of size L; (3) a specific device is developed to compute the moving solution in a comoving frame, to minimize the effects of the finite‐box approximation. Applications illustrate the efficiency of the approach for different types of nonlinearities, with systematic assessment of numerical errors. Converged numerical results are found insensitive to the time step, and scaling laws for the combined dependence of the numerical error with respect to L and to the spatial step size are obtained. The method proves fast and accurate and could be applied to a wide variety of equations with moving fronts as solutions; notably, Weertman‐type equations with the Cauchy‐type kernel replaced by a fractional Laplacian. 相似文献
956.
Newton‐Krylov method for computing the cyclic steady states of evolution problems in nonlinear mechanics 下载免费PDF全文
Ustim Khristenko Patrick Le Tallec 《International journal for numerical methods in engineering》2018,116(3):178-201
This work is focused on the Newton‐Krylov technique for computing the steady cyclic states of evolution problems in nonlinear mechanics with space‐time periodicity conditions. This kind of problems can be faced, for instance, in the modeling of a rolling tire with a periodic tread pattern, where the cyclic state satisfies “rolling” periodicity condition, including shifts both in time and space. The Newton‐Krylov method is a combination of a Newton nonlinear solver with a Krylov linear solver, looking for the initial state, which provides the space‐time periodic solution. The convergence of the Krylov iterations is proved to hold in presence of an adequate preconditioner. After preconditioning, the Newton‐Krylov method can be also considered as an observer‐controller method, correcting the transient solution of the initial value problem after each period. Using information stored while computing the residual, the Krylov solver computation time becomes negligible with respect to the residual computation time. The method has been analyzed and tested on academic applications and compared with the standard evolution (fixed point) method. Finally, it has been implemented into the Michelin industrial code, applied to a full 3D rolling tire model. 相似文献
957.
Patrick Georges 《Scientometrics》2017,112(1):21-53
This paper proposes a statistical analysis that captures similarities and differences between classical music composers with the eventual aim to understand why particular composers ‘sound’ different even if their ‘lineages’ (influences network) are similar or why they ‘sound’ alike if their ‘lineages’ are different. In order to do this we use statistical methods and measures of association or similarity (based on presence/absence of traits such as specific ‘ecological’ characteristics and personal musical influences) that have been developed in biosystematics, scientometrics, and bibliographic coupling. This paper also represents a first step towards a more ambitious goal of developing an evolutionary model of Western classical music. 相似文献
958.
959.
Xiaoen Wang Robert Kerr Fangfang Chen Nicolas Goujon Jennifer M. Pringle David Mecerreyes Maria Forsyth Patrick C. Howlett 《Advanced materials (Deerfield Beach, Fla.)》2020,32(18):1905219
With increasing demands for safe, high capacity energy storage to support personal electronics, newer devices such as unmanned aerial vehicles, as well as the commercialization of electric vehicles, current energy storage technologies are facing increased challenges. Although alternative batteries have been intensively investigated, lithium (Li) batteries are still recognized as the preferred energy storage solution for the consumer electronics markets and next generation automobiles. However, the commercialized Li batteries still have disadvantages, such as low capacities, potential safety issues, and unfavorable cycling life. Therefore, the design and development of electromaterials toward high-energy-density, long-life-span Li batteries with improved safety is a focus for researchers in the field of energy materials. Herein, recent advances in the development of novel organic electrolytes are summarized toward solid-state Li batteries with higher energy density and improved safety. On the basis of new insights into ionic conduction and design principles of organic-based solid-state electrolytes, specific strategies toward developing these electrolytes for Li metal anodes, high-energy-density cathode materials (e.g., high voltage materials), as well as the optimization of cathode formulations are outlined. Finally, prospects for next generation solid-state electrolytes are also proposed. 相似文献
960.
Charles Guillemard Wei Zhang Gregory Malinowski Claudia de Melo Jon Gorchon Sebastien Petit-Watelot Jaafar Ghanbaja Stéphane Mangin Patrick Le Fèvre Francois Bertran Stéphane Andrieu 《Advanced materials (Deerfield Beach, Fla.)》2020,32(26):1908357
Engineering of magnetic materials for developing better spintronic applications relies on the control of two key parameters: the spin polarization and the Gilbert damping, responsible for the spin angular momentum dissipation. Both of them are expected to affect the ultrafast magnetization dynamics occurring on the femtosecond timescale. Here, engineered Co2MnAlxSi1-x Heusler compounds are used to adjust the degree of spin polarization at the Fermi energy, P, from 60% to 100% and to investigate how they correlate with the damping. It is experimentally demonstrated that the damping decreases when increasing the spin polarization from 1.1 × 10−3 for Co2MnAl with 63% spin polarization to an ultralow value of 4.6 × 10−4 for the half-metallic ferromagnet Co2MnSi. This allows the investigation of the relation between these two parameters and the ultrafast demagnetization time characterizing the loss of magnetization occurring after femtosecond laser pulse excitation. The demagnetization time is observed to be inversely proportional to 1 – P and, as a consequence, to the magnetic damping, which can be attributed to the similarity of the spin angular momentum dissipation processes responsible for these two effects. Altogether, the high-quality Heusler compounds allow control over the band structure and therefore the channel for spin angular momentum dissipation. 相似文献