全文获取类型
收费全文 | 295篇 |
免费 | 20篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 93篇 |
金属工艺 | 13篇 |
机械仪表 | 7篇 |
建筑科学 | 18篇 |
能源动力 | 3篇 |
轻工业 | 51篇 |
无线电 | 21篇 |
一般工业技术 | 54篇 |
冶金工业 | 14篇 |
原子能技术 | 3篇 |
自动化技术 | 33篇 |
出版年
2023年 | 7篇 |
2022年 | 13篇 |
2021年 | 8篇 |
2020年 | 4篇 |
2019年 | 11篇 |
2018年 | 11篇 |
2017年 | 5篇 |
2016年 | 18篇 |
2015年 | 14篇 |
2014年 | 19篇 |
2013年 | 25篇 |
2012年 | 18篇 |
2011年 | 29篇 |
2010年 | 24篇 |
2009年 | 19篇 |
2008年 | 20篇 |
2007年 | 16篇 |
2006年 | 12篇 |
2005年 | 8篇 |
2004年 | 5篇 |
2003年 | 4篇 |
2002年 | 9篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 4篇 |
排序方式: 共有315条查询结果,搜索用时 15 毫秒
21.
Carole Guillaume Jeremy Pinte Nathalie Gontard Emmanuelle Gastaldi 《Food research international (Ottawa, Ont.)》2010,43(5):1395-1401
The objective of the present work was to understand how the structural, surface, water vapour and gas barrier properties of wheat gluten (WG) coated paper could be influenced by the features of paper. For this purpose, a surface treated paper (TP) and an untreated paper (UTP) were compared. Penetration of WG-coating into the bulk of paper was more pronounced in UTP than TP. This led to the formation of a significant junction zone resulting in an interpenetrated structure for WG–UTP, suggesting a composite-like structure, while a bi-layer one was obtained for WG–TP. Differences in WG penetration were related to the hydrophilicity, roughness and porosity of the paper used. Even though the extent of penetration did not greatly affect the surface properties (water and oil resistance), the transfer properties (water vapour, O2 and CO2) of WG-coated papers were significantly improved when WG-coating highly penetrated: while the WG–TP behaved as a micro-perforated material, the WG–UTP behaved as WG-film. 相似文献
22.
Remy Chevallier Emmanuelle Encrenaz-Tiphene Laurent Fribourg Weiwen Xu 《Formal Methods in System Design》2009,34(1):59-81
Using a variant of Clariso-Cortadella’s parametric method for verifying asynchronous circuits, we analyse some crucial timing
behaviors of the architecture of SPSMALL memory, a commercial product of STMicroelectronics. Using the model of parametric
timed automata and model checker HYTECH, we formally derive a set of linear constraints that ensure the correctness of the
response times of the memory. We are also able to infer the constraints characterizing the optimal setup timings of input
signals. We have checked, for two different implementations of this architecture, that the values given by our model match
remarkably with the values obtained by the designer through electrical simulation.
Partially supported by project MEDEA+ Blueberries.
A preliminary version appeared in the Proceedings of 4th International Conference on Formal Modelling and Analysis of Timed
Systems (FORMATS’06), Sept. 2006. 相似文献
23.
24.
Amine Ammar Emmanuelle Abisset-Chavanne Francisco Chinesta Roland Keunings 《International Journal of Material Forming》2017,10(4):547-556
Permeability is the fundamental macroscopic material property needed to quantify the flow in a fibrous medium viewed as a porous medium. Composite processing models require the permeability as input data to predict flow patterns and pressure fields. In a previous work, the expressions of macroscopic permeability were derived in a double-scale porosity medium for both Newtonian and generalized Newtonian (shear-thinning) resins. In the linear case, only a microscopic calculation on a representative volume is required, implying as many microscopic calculations as there are representative microscopic volumes in the whole fibrous structure. In the non-linear case, and even when the porous microstructure can be described by a unique representative volume, a large number of microscopic calculations must be carried out as the microscale resin viscosity depends on the macroscopic velocity, which in turn depends on the permeability that results from a microscopic calculation. An original and efficient offline-online procedure was proposed for the solution of non-linear flow problems related to generalized Newtonian fluids in porous media. In this paper, this procedure is generalized to quasi-Newtonian fluids in order to evaluate the effect of extensional viscosity on the resulting upscaled permeability. This work constitutes a natural step forward in the definition of equivalent saturated permeabilities for linear and non-linear fluids. 相似文献
25.
Emmanuelle Fauchart 《突发事故与危机管理杂志》2006,14(2):97-106
Most technological accidents studied in the literature consist of a single event occurring in a single location (Challenger, Chernobyl, Ariane 5, Bhopal, etc.). However, a significant number of accidents comprise a series of incidents taking place in multiple and unconnected locations. This may happen whenever a given technology is used by multiple decentralized users – as is the case for medical devices or diving equipment, for instance. In this paper, we argue that such a structural characteristic raises specific problems and issues in terms of learning from accidents. We focus on a specific issue and problem: information asymmetries between the users and the manufacturer in favor of the manufacturer and the risk of “moral hazard” that they can induce. Using second hand information on a well known case (Therac‐25), we show how the manufacturer behaved opportunistically when it came to learn from a series of decentralized incidents and we argue that this opportunism was made possible by information asymmetries. Following predictions from the principal‐agent theory, we then argue that for users to monitor manufacturers' behavior in a sense favorable to the taking place of learning from accident, it is necessary to ensure communication among users of risky technologies. Besides reducing information asymmetries conducive to moral hazard this would moreover improve risk prevention. Yet, as communication among decentralized users is unlikely to arise spontaneously in most cases, we argue that this makes the case for public intervention in the form of publicly sponsored user groups. 相似文献
26.
Marchand B Douek PC Robert P Corot C Roux JP Adeleine P Hernandez-Hoyos M Cremillieux Y Orkisz M Canet E 《Magma (New York, N.Y.)》2002,14(3):259-267
Purpose To investigate the relative role of high resolution (spatial or temporal) magnetic resonance angiography (MRA) sequence and
of contrast agent properties in the evaluation of high-degree arterial stenosis.
Methods We qualitatively and quantitatively studied both 50 and 95% (300 μm diameter) stenosis of a 6 mm arterial phantom with two
contrast agents (CA), Gd-DOTA (r1 =2.9 mM−1 s−1) versus P760 (r1 =25 mM−1 s−1) at several CA concentrations, including arterial peak concentration after injection of either a single or double dose of
CA, using either a high temporal (booster) or high spatial (HR) resolution 3D MRA sequences. Experimental data were then compared
to theoretical data.
Results With the 3D HR sequence, both visual and quantitative analysis were significantly better compared to the 3D booster sequence,
at each phantom diameter. Quantitative analysis was significantly improved by injection of a double versus a single dose of
each CA (Gd-DOTA or P760), primarily in high degree stenosis.
Conclusion Combined MRA spatial resolution and high CA efficiency are mandatory to correctly evaluate high degree stenosis. 相似文献
27.
C. R. Alves Renata Aquino Jérôme Depeyrot Francisco A. Tourinho Emmanuelle Dubois Régine Perzynski 《Journal of Materials Science》2007,42(7):2297-2303
Manganese ferrite nanoparticles, in the size range 3.3–9.0 nm, are prepared by a hydrothermal coprecipitation process and peptized in aqueous solution. The magnetization curves recorded at room temperature on diluted colloidal sols allow characterizing the distribution of magnetic moment by using a simple Langevin formalism. Mössbauer spectroscopy measurements performed on powder samples at 77 K exhibit a quadrupolar doublet which intensity grows at the expense of the hyperfine sextet pattern as the nanoparticles mean size decreases. The magnetic dynamics behavior is then investigated by measurements of magnetic hysteretic properties at 5 K and temperature dependence of the zero field cooling (ZFC) susceptibility. The values found for the effective anisotropy constant and the dependence of the irreversibility field, inversely proportional to the reference size, clearly indicate that the magnetic anisotropy of our nanoparticles finds its origin on the disordered surface layer. 相似文献
28.
Emmanuel Defaÿ David Wolozan Jean-Pierre Blanc Emmanuelle Serret Pierre Garrec Sophie Verrun Denis Pellissier Philippe Delpech Julie Guillan Bernard Andr Laurent Ulmer Marc Aïd Pascal Ancey 《Solid-state electronics》2007,51(11-12):1624
This paper describes realization and characterization of SrTiO3 (STO) high K MIM capacitors above BiCMOS integrated circuit (IC). These capacitances are connected to IC and are used as coupling capacitors in order to realize a high pass filter. Surface capacitance achieved is 10 nF/mm2 with capacitance value of 1.2 nF. The process for STO MIM fabrication does not exceed 400 °C, which is compatible with interconnections. Typical K and dielectric losses values obtained are, respectively 110% and 2%. Yield obtained reaches 83% for capacitors. A functional high pass filter using these STO capacitors was realized in this study. It exhibits a cut-off frequency at 6.5 kHz and a constant gain at higher frequencies of −1.3 dB. 相似文献
29.
Taous-Meriem Laleg-Kirati Emmanuelle Crépeau Michel Sorine 《Mathematics of Control, Signals, and Systems (MCSS)》2013,25(1):37-61
This study introduces a new signal analysis method, based on a semi-classical approach. The main idea in this method is to interpret a pulse-shaped signal as a potential of a Schrödinger operator and then to use the discrete spectrum of this operator for the analysis of the signal. We present some numerical examples and the first results obtained with this method on the analysis of arterial blood pressure waveforms. 相似文献
30.
Anniet M. Laverman Josette A. Garnier Emmanuelle M. Mounier Céline L. Roose-Amsaleg 《Water research》2010,44(6):1753-1764
A significant amount of nitrogen entering river basins is denitrified in riparian zones. The aim of this study was to evaluate the influence of nitrate and carbon concentrations on the kinetic parameters of nitrate reduction as well as nitrous oxide emissions in river sediments in a tributary of the Marne (the Seine basin, France). In order to determine these rates, we used flow-through reactors (FTRs) and slurry incubations; flow-through reactors allow determination of rates on intact sediment slices under controlled conditions compared to sediment homogenization in the often used slurry technique. Maximum nitrate reduction rates (Rm) ranged between 3.0 and 7.1 μg N g−1 h−1, and affinity constant (Km) ranged from 7.4 to 30.7 mg N-NO3− L−1. These values were higher in slurry incubations with an Rm of 37.9 μg N g−1 h−1 and a Km of 104 mg N-NO3− L−1. Nitrous oxide production rates did not follow Michaelis-Menten kinetics, and we deduced a rate constant with an average of 0.7 and 5.4 ng N g−1 h−1 for FTR and slurry experiments respectively. The addition of carbon (as acetate) showed that carbon was not limiting nitrate reduction rates in these sediments. Similar rates were obtained for FTR and slurries with carbon addition, confirming the hypothesis that homogenization increases rates due to release of and increasing access to carbon in slurries. Nitrous oxide production rates in FTR with carbon additions were low and represented less than 0.01% of the nitrate reduction rates and were even negligible in slurries. Maximum nitrate reduction rates revealed seasonality with high potential rates in fall and winter and low rates in late spring and summer. Under optimal conditions (anoxia, non-limiting nitrate and carbon), nitrous oxide emission rates were low, but significant (0.01% of the nitrate reduction rates). 相似文献