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101.
Jean Blaise Jean Vergès Jean-Fran?ois Wyart Rolf Engleman Jr 《Journal of research of the National Institute of Standards and Technology》1992,97(1):213-216
All known energy levels of neutral platinum (Pt I) are presented, including 119 new levels based on analysis of recent comprehensive observations of the spectrum. These results are taken from a detailed analysis of the spectrum to be published in Journal de Physique II. 相似文献
102.
Jean-François Colonna 《The Visual computer》1995,11(8):447-452
For many scientists, human intelligence and, in particular, its creative potential seem to consist of processes that cannot
be automated by means of a computer. As already shown with fractal geometry, this short note tries to show that the iteration
and combination of very elementary operations can give very complex behaviors and shapes. It gives some practical examples
to encourage reader involvement and new experiments, particularly in classroom settings. 相似文献
103.
Component-based systems permit standardisation and re-usability of code through the use of components. The architecture of component-based systems can be modified thanks to dynamic reconfigurations, which contribute to systems’ (self-)adaptation by adding or removing components without incurring any system downtime. In this context, the present article describes a formal model for dynamic reconfigurations of component-based systems. It provides a way of expressing runtime reconfigurations of a system and proving their correctness according to a static invariant for consistency constraints and/or a user-provided post-condition. Guarded reconfigurations allow us to build reconfigurations based on primitive reconfiguration operations using sequences of reconfigurations and the alternative and the repetitive constructs, while preserving configuration consistency. A practical contribution consists of the implementation of a component-based model using the GROOVE graph transformation tool. This implementation is illustrated on a cloud-based multi-tier application hosting environment managed as a component-based system. In addition, after enriching the model with interpreted configurations and reconfigurations in a consistency compatible manner, component systems’ implementations are related to their specifications by a simulation relation. 相似文献
104.
Jean Pascal Eloundou Emmanuel Girard-Reydet Jean-François Gérard Jean-Pierre Pascault 《Polymer Bulletin》2005,53(5-6):367-375
Summary Above a concentration c* close to 0.3 wt%, blends of 12-hydroxystearic acid (HSA) with diglycidyl ether of bisphenol A (DGEBA) prepolymer mixed at 80°C give thermally reversible physical gels (organogels) on cooling.According with the literature, the turbidity of the gels indicates fibres of rectangular cross-sectional shapes. The slope of the linear melting heats versus concentration is equal to the melting heat of the pure HSA (-182 ± 4 J.g-1).The blends are gels as the elastic modulus G is about ten times larger than the loss one G and G is practically independent of the frequency at a given concentration.The sharp variation of the temperature of the endothermic peak Tpeak, of the time to reach the rubbery plateau tr, of the exponent (G) and of the limiting strain l of the linear viscoelastic domain below 2.5 wt%, is attributed to smaller crystallites in the blend.At a given frequency, G follows a scaling law with the concentration (
), the scaling exponent 1 being equal to 3.87 ± 0.02 at 1 rad.s-1. This indicates that the gel structure is independent of the concentration. 相似文献
105.
Xuehao Lin Jean-François H. Lambert José J. Fripiat Marc Monthioux Agnès Oberlin 《Catalysis Letters》1989,3(2):169-177
The kinetics of gas phase hydrogen uptake into platinized VMoO5.5 to form the bronze H–3.2VMoO5.5 is limited by diffusion of atomic hydrogen from Pt crystallites to the mixed oxide (spillover). It is therefore strongly dependent on the precursor platinum salt (H2PtCl6, Pt(NH3)4Cl2 or Pt(NH3)4(OH)2) as well as on the pretreatment conditions between salt deposition and hydrogen exposure, since these parameters determine platinum dispersion. While traditional techniques for metal dispersion measurement, such as CO adsorption or H2 adsorption/titration are inappropriate for this system, semi-quantitative information on Pt dispersion can be extracted from a simple analysis of the kinetics. These dispersion estimates are in reasonably good agreement with average particle sizes obtained from TEM micrographs. 相似文献
106.
Benjamin Negrevergne Alexandre Termier Marie-Christine Rousset Jean-François Méhaut 《Data mining and knowledge discovery》2014,28(3):593-633
In this paper, we present Para Miner which is a generic and parallel algorithm for closed pattern mining. Para Miner is built on the principles of pattern enumeration in strongly accessible set systems. Its efficiency is due to a novel dataset reduction technique (that we call EL-reduction), combined with novel technique for performing dataset reduction in a parallel execution on a multi-core architecture. We illustrate Para Miner’s genericity by using this algorithm to solve three different pattern mining problems: the frequent itemset mining problem, the mining frequent connected relational graphs problem and the mining gradual itemsets problem. In this paper, we prove the soundness and the completeness of Para Miner. Furthermore, our experiments show that despite being a generic algorithm, Para Miner can compete with specialized state of the art algorithms designed for the pattern mining problems mentioned above. Besides, for the particular problem of gradual itemset mining, Para Miner outperforms the state of the art algorithm by two orders of magnitude. 相似文献
107.
108.
Jean-François Gravel Matthias Geissler Sébastien Chapdelaine Karel Boissinot Benoît Voisin Isabelle Charlebois Hugo-Pierre Poirier-Richard Alexandre Grégoire Maurice Boissinot Michel G. Bergeron Teodor Veres Denis Boudreau 《Microfluidics and nanofluidics》2014,16(6):1075-1087
This paper describes the design, functioning and use of a portable detection platform for multiplex nucleic acid testing. The system features a bead-supported DNA hybridization assay performed inside a microfluidic cartridge. Polystyrene particles modified with DNA capture probes are confined in the detection area and exposed to a solution of fluorescently labeled target DNA strands. The cartridge, fabricated from inexpensive thermoplastic polymers, allows for conducting up to eight assays in parallel. The detection instrument is equipped with a pneumatic module and a manifold lid serving as an interface to mediate fluid displacement on the cartridge. The fluorescence signal deriving from each assay is recorded by a semi-confocal fluorescence reader embedded in the detection platform. The compact design of the instrument and its level of integration make it possible to obtain an analytical result in less than 15 min, while only few manual steps need to be performed in between. A proof-of-concept demonstration involving Cy3-labeled, PCR-amplified genomic DNA confirms the ability to detect Bacillus anthracis in a multiplexed single-assay format using lef and capC genes. Limits of quantification are on the order of 1 × 109 copies/μL for lef targets. 相似文献
109.
Emmanuel Filiot Naiyong Jin Jean-François Raskin 《International Journal on Software Tools for Technology Transfer (STTT)》2013,15(5-6):541-561
In this paper, we show how to exploit the structure of some automata-based construction to efficiently solve the LTL synthesis problem. We focus on a construction proposed in Schewe and Finkbeiner that reduces the synthesis problem to a safety game, which can then be solved by computing the solution of the classical fixpoint equation νX.Safe ∩ CPre(X), where CPre(X) are the controllable predecessors of X. We have shown in previous works that the sets computed during the fixpoint algorithm can be equipped with a partial order that allows one to represent them very compactly, by the antichain of their maximal elements. However the computation of CPre(X) cannot be done in polynomial time when X is represented by an antichain (unless P = NP). This motivates the use of SAT solvers to compute CPre(X). Also, we show that the CPre operator can be replaced by a weaker operator CPre crit where the adversary is restricted to play a subset of critical signals. We show that the fixpoints of the two operators coincide, and so, instead of applying iteratively CPre, we can apply iteratively CPre crit. In practice, this leads to important improvements on previous LTL synthesis methods. The reduction to SAT problems and the weakening of the CPre operator into CPre crit and their performance evaluations are new. 相似文献
110.
Llorens I Lahera E Delnet W Proux O Braillard A Hazemann JL Prat A Testemale D Dermigny Q Gelebart F Morand M Shukla A Bardou N Ulrich O Arnaud S Berar JF Boudet N Caillot B Chaurand P Rose J Doelsch E Martin P Solari PL 《The Review of scientific instruments》2012,83(6):063104
Fluorescence detection is classically achieved with a solid state detector (SSD) on x-ray absorption spectroscopy (XAS) beamlines. This kind of detection however presents some limitations related to the limited energy resolution and saturation. Crystal analyzer spectrometers (CAS) based on a Johann-type geometry have been developed to overcome these limitations. We have tested and installed such a system on the BM30B/CRG-FAME XAS beamline at the ESRF dedicated to the structural investigation of very dilute systems in environmental, material and biological sciences. The spectrometer has been designed to be a mobile device for easy integration in multi-purpose hard x-ray synchrotron beamlines or even with a laboratory x-ray source. The CAS allows to collect x-ray photons from a large solid angle with five spherically bent crystals. It will cover a large energy range allowing to probe fluorescence lines characteristic of all the elements from Ca (Z = 20) to U (Z = 92). It provides an energy resolution of 1-2 eV. XAS spectroscopy is the main application of this device even if other spectroscopic techniques (RIXS, XES, XRS, etc.) can be also achieved with it. The performances of the CAS are illustrated by two experiments that are difficult or impossible to perform with SSD and the complementarity of the CAS vs SSD detectors is discussed. 相似文献