全文获取类型
收费全文 | 1428篇 |
免费 | 71篇 |
国内免费 | 7篇 |
专业分类
电工技术 | 13篇 |
综合类 | 2篇 |
化学工业 | 410篇 |
金属工艺 | 57篇 |
机械仪表 | 38篇 |
建筑科学 | 43篇 |
矿业工程 | 1篇 |
能源动力 | 35篇 |
轻工业 | 162篇 |
水利工程 | 4篇 |
石油天然气 | 2篇 |
无线电 | 150篇 |
一般工业技术 | 276篇 |
冶金工业 | 56篇 |
原子能技术 | 10篇 |
自动化技术 | 247篇 |
出版年
2024年 | 1篇 |
2023年 | 17篇 |
2022年 | 29篇 |
2021年 | 57篇 |
2020年 | 31篇 |
2019年 | 33篇 |
2018年 | 28篇 |
2017年 | 34篇 |
2016年 | 57篇 |
2015年 | 41篇 |
2014年 | 65篇 |
2013年 | 104篇 |
2012年 | 125篇 |
2011年 | 95篇 |
2010年 | 91篇 |
2009年 | 92篇 |
2008年 | 85篇 |
2007年 | 61篇 |
2006年 | 69篇 |
2005年 | 54篇 |
2004年 | 40篇 |
2003年 | 38篇 |
2002年 | 40篇 |
2001年 | 14篇 |
2000年 | 22篇 |
1999年 | 15篇 |
1998年 | 24篇 |
1997年 | 19篇 |
1996年 | 23篇 |
1995年 | 16篇 |
1994年 | 17篇 |
1993年 | 10篇 |
1992年 | 5篇 |
1991年 | 9篇 |
1990年 | 10篇 |
1989年 | 5篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 4篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1968年 | 1篇 |
排序方式: 共有1506条查询结果,搜索用时 15 毫秒
41.
Duhamel Cécilie Caballero Jacqueline Couvant Thierry Crépin Jérôme Gaslain Fabrice Guerre Catherine Le Hong-Thaï Wehbi Mickaël 《Oxidation of Metals》2017,88(3-4):447-457
Oxidation of Metals - The present work focuses on the intergranular oxidation of Alloy 600 and its weld material Alloy 82 after exposure in simulated primary water at 340–360 °C... 相似文献
42.
43.
Nicolas Clabaux Thierry BrenacChristophe Perrin Joël MagninBastien Canu Pierre Van Elslande 《Accident; analysis and prevention》2012
Previous research on motorcycle crashes has shown the frequency and severity of accidents in which a non-priority road user failed to give way to an approaching motorcyclist without seeing him/her, even though the road user had looked in the approaching motorcycle's direction and the motorcycle was visible. These accidents are usually called “looked-but-failed-to-see” (LBFS) accidents. This article deals with the effects that the motorcyclist's speed has in these accidents. It is based on the in-depth study and precise kinematic reconstruction of 44 accident cases involving a motorcyclist and another road user, all occurring in intersections. The results show that, in urban environments, the initial speeds of motorcyclists involved in “looked-but-failed-to-see” accidents are significantly higher than in other accidents at intersections. In rural environments, the difference in speed between LBFS accidents and other accidents is not significant, but further investigations would be necessary to draw any conclusions. These results suggest that speed management, through road design or by other means, could contribute to preventing “looked-but-failed-to-see” motorcycle accidents, at least in urban environments. 相似文献
44.
Gabriel Kalyon Tristan Le Gall Hervé Marchand Thierry Massart 《Discrete Event Dynamic Systems》2012,22(2):121-161
We propose algorithms for the synthesis of state-feedback controllers with partial observation of infinite state discrete
event systems modelled by Symbolic Transition Systems. We provide models of safe memoryless controllers both for potentially
deadlocking and deadlock free controlled systems. The termination of the algorithms solving these problems is ensured using
abstract interpretation techniques which provide an overapproximation of the transitions to disable. We then extend our algorithms
to controllers with memory and to online controllers. We also propose improvements in the synthesis of controllers in the
finite case which, to our knowledge, provide more permissive solutions than what was previously proposed in the literature.
Our tool SMACS gives an empirical validation of our methods by showing their feasibility, usability and efficiency. 相似文献
45.
46.
Damien Trentesaux Cyrille Pach Abdelghani Bekrar Yves Sallez Thierry Berger Thérèse Bonte Paulo Leitão José Barbosa 《Control Engineering Practice》2013,21(9):1204-1225
Benchmarking is comparing the output of different systems for a given set of input data in order to improve the system’s performance. Faced with the lack of realistic and operational benchmarks that can be used for testing optimization methods and control systems in flexible systems, this paper proposes a benchmark system based on a real production cell. A three-step method is presented: data preparation, experimentation, and reporting. This benchmark allows the evaluation of static optimization performances using traditional operation research tools and the evaluation of control system's robustness faced with unexpected events. 相似文献
47.
This paper addresses the problem of navigating in a provably safe manner a mobile robot with a limited field-of-view placed
in a unknown dynamic environment. In such a situation, absolute motion safety (in the sense that no collision will ever take
place whatever happens in the environment) is impossible to guarantee in general. It is therefore settled for a weaker level
of motion safety dubbed passive motion safety: it guarantees that, if a collision takes place, the robot will be at rest. 相似文献
48.
Hassan Al Sabea Lucie Norel Olivier Galangau Thierry Roisnel Olivier Maury Franois Riob Stphane Rigaut 《Advanced functional materials》2020,30(30)
This work describes a class of complex combining three dithienylethene units and a lanthanide ion used as an optical system displaying a double encryption method: i) a colorful code, drawn and erased under UV and visible irradiations respectively, due to coloration and discoloration of the photochromic entities, and ii) a concomitant gradual disappearance and progressive restoration of the associated lanthanide ion luminescence triggered with the same stimuli. The innovation of the system stems from the emission color tunability, i.e., with either a lanthanide ion emitting only in the visible range (Eu3+) or with another lanthanide ion emitting only in the near infrared (NIR) range (Yb3+), therefore observable, or not, to the naked eye. This system is the very first one to achieve efficient repeatable modulation of pure NIR luminescence on photochemical command. Furthermore, it is proven to be highly efficient when embedded in a PDMS polymer opening real opportunities for practical applications as anti‐counterfeiting. 相似文献
49.
50.
Pimchaya Luangaramvej Peeranuch Poungsripong Stephan Thierry Dubas 《Polymer International》2022,71(1):139-145
Polyelectrolyte complex (PEC) membranes prepared from poly(styrene sulfonate) (PSS) and poly(diallyldimethylammonium chloride) (PDADMAC) were modified by crossflow polymerization of aniline (ANI). The PEC membranes were used as separators in a two-compartment setup where ANI monomer and ammonium persulfate (APS) oxidant diffused through the membranes to form polyaniline (PANI). APS and ANI having different distributions throughout the membranes, the reaction led to the asymmetric polymerization of PANI on one face of each PEC membrane thus producing Janus membranes. Due to the excess PANI content, the membrane displayed distinct asymmetric electrical conductivities on each face. Interestingly, very different ANI polymerizations were obtained when nonstoichiometric PEC membranes having different molar ratio of cationic and anionic polyelectrolytes (P+:P? represents PDADMAC:PSS) were used and transport of APS was fastest through the 2:1 PEC when compared to the 1:2 PEC. In all experiments, the polymerization was most intense on the ANI side of the membranes. Also, the influence of NaCl both during PEC fabrication and during polymerization was studied and found to have some effect on the solute permeability. Results showed that a higher content of PANI was formed on PEC membranes having excess P+ and with no NaCl added during PEC fabrication. Although X-ray diffraction confirmed the presence of PANI on both sides of each membrane, scanning electron microscopy images demonstrated that both sides of each membrane had different PANI content deposited. Electrical conductivity measurements using a four-point probe setup also showed that the PEC–PANI exhibits asymmetric electrical property on different sides. © 2021 Society of Industrial Chemistry. 相似文献