نتایج جستجو برای: de vardas catalyst
تعداد نتایج: 1575478 فیلتر نتایج به سال:
résumé depuis la création de la culture écrite, il est rare quune œuvre soit dépourvue de reflet de la culture populaire dans ses diverses manifestations, y compris ladage et les proverbes. ceux-ci constituent les éléments clés de toute langue supportant le poids des traditions et des coutumes, lhistoire, le caractère et la vision dune nation. les proverbes français et persans touchant des élé...
résumé : un rapide survol des manuels de langue révèle leur insuffisance en tant qu’un support destiné à systématiser le processus denseignement/ apprentissage et à mener les apprenants vers la pratique naturelle dune langue étrangère. nous nous sommes servis du substantif "insuffisance " car dans les manuels, les connaissances à transmettre demeurent au stade de la présentation et on s’y occ...
théoriquement, lenseignement constitue, dans la relation didactique, un pôle symétrique à celui de lapprentissage. du point de vue du curriculum, lenseignement est généralement caractérisé comme le moyen par lequel le curriculum est mis en oeuvre. les progrès dans les connaissances psychologiques sur les phénomènes dappropriation ont montré quun savoir est véritablement approprié, cest-à-d...
Inkjet printing is a very powerful digital and mask-less microfabrication technique that has attracted the attention of several research groups working on electrochemical energy conversion concepts. In this short review, an overview is given about recent efforts to employ inkjet printing for the search of new electrocatalyst materials and for the preparation of catalyst layers for polymer elect...
The Pd catalyst effect on low temperature hydrogen desorption from hydrided ultrathin Mg nanoblades.
We present hydrogenation/de-hydrogenation properties of ultrathin Mg nanoblades coated with Pd as a catalyst. The hydrided Pd/Mg/Pd and Pd/Mg nanoblades were highly curved as observed by ex situ scanning electron microscopy. An in situ thermal desorption spectroscopy (TDS) study showed that the hydrided Pd/Mg/Pd nanostructure has a low hydrogen desorption temperature, at ∼365 K. Through a combi...
A Ce0.3TiOx oxide carrier was synthesized via a sol-gel process, and Ce0.3TiOx supported metal (M=Cd, Mn, Fe, W, Mo) oxide catalysts were prepared by the method of incipient-wetness impregnation. The catalysts were characterized by means of X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transfor...
Journal of the American Chemical Society is published by the American Chemical Society. 1155 Sixteenth Street N.W., Washington, DC 20036 Systematic design of chemical oscillators. 10. Minimal bromate oscillator: bromate-bromide-catalyst Miklos Orban, Patrick De Kepper, and Irving R. Epstein J. Am. Chem. Soc., 1982, 104 (9), 2657-2658• DOI: 10.1021/ja00373a063 • Publication Date (Web): 01 May 20...
A series of new octahydrobenzo[b]indeno[1,2,3-de][1,8] naphthyridine and decahydropyrido[2,3,4-gh]phenanthridine derivatives were synthesized via a four-component domino reaction under microwave irradiation. This one-pot transformation, which involved multiple steps and did not require the use of a catalyst, constructed four new C-C bonds, two new C-N bonds, and three new rings, with efficient ...
In this paper, ZnO thin film is deposited on slide glass substrate using the sol-gel process. Presenting well-defined orientation of ZnO thin films Nanostructure were obtained by dip coating of zinc acetate dihydrate, monoethanolamine (MEA), de-ionized water and isopropanol alcohol. The annealed ZnO thin films were transparent ca 85-90% in visible range with an absorption edges at about 375 nm....
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