E-learning systems for teaching industrial automatism

The examples of e-learning systems have been successfully tested in a number of international engineering college and innovative industry and make it possible to improve  performance of production by raising the professional level of the students and staff. E-learning can directly tie education to the formation of tutorial for teaching industrial automatism, the purpose of this study is to discuss strategies for developing integrated e-learning courseware based on instructional design and technology models. The essential of this methodological approach is to specify the composition of the various teaching modules in industrial automatism to be accessible to the students with a system modeling method and to develop a digital support that can be exploited in distance learning. E-learning systems aims at a two-way knowledge, communication between academia and industry. E-learning systems provides a real-life environment for engineers to develop their skills and comprehend the challenges involved in everyday industrial practice. This paper describes the challenges for using automates in the industry, It presents the fully application of system analysis for the design of a tutorial for teaching industrial automatism

Nanohybrides inorganique-organiques à base de ZnO, Zn0,95Ni0,05O,coeur-coquille ZnO@g-Fe2O3 et de polymères bioactifs ( Elaboration,propriétés optiques et magnétiques, cytotoxicité.)

Des nanoparticules des oxydes : ZnO, Zn0,95Ni0,05O et coeur-coquille ZnO@g-Fe2O3 ont été synthétisées par hydrolyse forcée en milieu polyol. Les particules sont quasi-sphériques de diamètre moyen 20-30 nm. Les trois classes présentent des propriétés de photoluminescence alors que les nanoparticules de l oxyde de zinc dopé au nickel et les nanoparticules ZnO@g-Fe2O3 sont superparamagnétiques. Grâce à la polymérisation radicalaire contrôlée, deux polymères bioactifs (le poly(sodium-4-styrenesulfonate) et le poly(sodium-4-styrenesulfonate co sodium methacrylate)) ont été greffés à la surface de ces nanoparticules. Les nanocomposites ainsi obtenus conservent leurs performances magnétiques et voient leurs caractéristiques optiques s améliorer. L enrobage des nanoparticules d oxyde par les polymères bioactifs réduit la cytotoxicité de ces nanoparticules. Mots-Clés : nanoparticules, propriétés magnétiques et optiques, polymère bioactif,nanohybrides, cytotoxicité.ZnO, Zn0.95Ni0.05O and core@shell ZnO@g-Fe2O3 nanoparticles have been prepared using forced hydrolysis of acetate metallic salts in a polyol medium and coated with poly(sodium-4- styrenesulfonate) and poly(sodium-4-styrenesulfonate co sodium methacrylate) via surfaceinitiated atom transfer radical polymerization. The bare nanoparticles display sphericalmorphology with a diameter size laying in the range 20 - 30 nm. The polymer chains weregrown from the surface to yield hybrid nanoparticles with an organic shell of 1 to 3 nm width. The surface modification with polymer did not alter the magnetic and optical properties of bare particles allowing their potential use for biomedical applications. The viability of human endothelial cells was not affected by coated nanoparticles after 48 h of exposition and normal proliferation occurred up to 8 days without alteration of the cell structure. Keywords: nanoparticles, magnetic and optical properties, bioactive Polymer, nonohybrids,cytotoxicity.PARIS13-BU Sciences (930792102) / SudocSudocFranceF

Synthesis and characterization of rod-like ZnO decorated with gamma-Fe2O3 nanoparticles monolayer

International audienceDecorated rod-like ZnO particles with g-Fe2O3 nanoparticles monolayer (ZnO@g-Fe2O3) were prepared via a simple route using forced hydrolysis of metal acetates in a polyol medium. The phases and purity of the as-prepared particles were established by powder X-ray diffraction (PXRD) and X-ray photo-electron spectroscopy (XPS) analyses. Transmission electron microscopy (TEM) showed that the ZnO particles present a typical rod-like morphology with similar to 80 nm diameter and similar to 200-400 nm length. These nanorods are decorated with well-organized g-Fe2O3 spherical nanoparticles showing a narrow size distribution around 5 nm. The photoluminescence (PL) spectra of the bare ZnO particles show predominant UV-excitonic and weak visible emission. The latter vanishes after covering the surface with the g-Fe2O3 nanoparticles suggesting an effect on the oxygen stoichiometry at the surface of the ZnO nanorods. The decorated nanoparticles exhibit magnetic response to an external magnetic field at room temperature and a superparamagnetic character with very low blocking temperature likely related to the organisation of g-Fe2O3 nanoparticles as monolayer. (C) 2013 Elsevier B. V. All rights reserved

Hybrid Au–Fe₃O₄ Nanoparticles: Plasmonic, Surface Enhanced Raman Scattering, and Phase Transition Properties

In this work, we report on the synthesis of hybrid Au–Fe₃O₄ nanoparticles (NPs) using a novel one-pot synthesis method that makes use of triethylene glycol as a solvent, a reducing agent, and a stabilizing layer. The produced nanoparticles consist of Au cores decorated with magnetite Fe₃O₄ nanoparticles. Optical absorption measurements combined with numerical simulations showed that the Au–Fe₃O₄ nanoparticles exhibit a localized surface plasmon resonance clearly red-shifted with respect to that of bare Au nanoparticles. This strong plasmonic resonance is exploited to produce surface-enhanced Raman scattering (SERS) from both the organic molecules and the iron oxide surrounding the Au cores. We found that the SERS signal exhibits strong temporal fluctuations which are used to identify the origin of the observed Raman lines. In particular, we clearly point out the presence of an iron hydroxide (γ-FeOOH) layer at the surface of the Fe₃O₄ nanoparticles forming the shell. This result is supported by numerical simulations of the plasmonic near field generated by the Raman probe. Moreover, we investigate the light-induced phase transition from magnetite to hematite (α-Fe₂O₃). Owing to the strong SERS effect we were able to detect the formation of diiron-oxo bonds during the phase transition. These bonds are ascribed to the presence of a mixed magnetite/maghemite phase. We thus propose a new scheme where the phase transition is triggered by the iron hydroxide surface layer. Such a transition is here studied for the first time in Au–Fe₃O₄ hybrid nanoparticles where the gold cores act as plasmonic nanoheaters responsible for the thermally induced phase transition

Comparative Study of Ni- and Co-Substituted ZnO Nanoparticles: Synthesis, Optical, and Magnetic Properties

International audienceNi- and Co-substituted ZnO nanoparticles were synthesized using forced hydrolysis of acetate metallic salts in a polyol medium. The X-ray diffraction patterns show a hexagonal wurtzite structure (space group P63mc). The characteristic absorption bands of UV-vis-IR spectra are correlated with the d-d transitions of tetrahedrally coordinated Co2+ and Ni2+ ions in octahedral and tetrahedral sites. The photoluminescence spectra exhibited a typical ZnO UV-exitonic emission band around 380 nm and a broad band between 400 and 500 nm that might be ascribed to the intrinsic defects in the ZnO material. The transmission electron microscopy displays spherical particles with a diameter between 20 and 30 nm. The magnetic measurements reveal that Zn1-xNixO and Zn1-xCoxO nanoparticles show, respectively, ferromagnetic and paramagnetic behavior at 5 K. Homogeneous distributions of Co and Ni ions in the particles observed by filter imaging analysis indicates that there is no evidence of Co or Ni metal throughout the powders