Search results for "naissance"
showing 10 items of 391 documents
La connaissance comme objet commun : La critique du capitalisme immatériel par André Gorz
2021
National audience
Electrosynthesis and electrochemistry
2015
Since the pioneering work of Kolbe, electrochemistry and electrosynthetic methods have been a part of the repertoire of the organic synthesis toolbox [1–2]. In general, only electrons are employed as reagents or the reagents are electrochemically regenerated. Consequently, waste can be avoided, and limited resources can be used in a careful and economic manner. Because alternative reaction pathways are employed by electrosynthetic methods, scarce and toxic elements can be replaced or are not required at all [3]. Moreover, in the foreseeable future regenerative sources of electricity, for example, photovoltaics and wind power, will provide a surplus of electricity as the current unsteady sup…
ChemInform Abstract: The Renaissance of Soluble Polymers
2010
The Renaissance of Soluble Polymers
2003
Microstructured Reactors for Polymer Synthesis: A Renaissance of Continuous Flow Processes for Tailor-Made Macromolecules?
2008
Organic synthesis in microfluidic devices has attracted increasing interest in recent years. However, little efforts had been undertaken to exploit this novel technology for polymer chemistry until several recent studies demonstrated the interesting potential of microreactors for the synthesis and modification of polymers. In fact, anionic polymerizations in continuous capillary flow-tube systems were established already in 1962 in pioneering work by Szwarc. Subsequent work focused on detailed kinetic analyses in such reactors. The present article explores different current strategies developed by several research groups to realize bulk and solution polymerizations using continuous flow mic…
The Renaissance of the 68Ge/68Ga Radionuclide Generator Initiates New Developments in 68Ga Radiopharmaceutical Chemistry
2010
⁶⁸Ge/⁶⁸Ga radionuclide generators have been investigated for almost fifty years now, since the cyclotron-independent availability of positron emitting ⁶⁸Ga via the ⁶⁸Ge/⁶⁸Ga system had always attracted researches working in basic nuclear chemistry as well as radiopharmaceutical chemistry. However, it took decades and generations of research (and researchers) to finally approach a reliable level of ⁶⁸Ge/⁶⁸Ga generator designs, adequate to the modern requirements of radiometal labeling chemistry. ⁶⁸Ga radiopharmacy now is awaking from a sort of hibernation. The exciting perspective for the ⁶⁸Ge/⁶⁸Ga generator, now - more than ever, asks for systematic chemical, radiochemical, technological an…
Approche neuropsychologique du syndrome de Williams : Aspects-visuospatiaux
2009
International audience; Nous envisageons différentes dimensions de la cognition visuo-spatiale et visuo-constructive : le fonctionnement perceptif, les représentations spatiales et l’attention spatiale, la mémoire à court terme visuelle, les tâches visuo-constructives comme le dessin ou la construction de configurations avec des cubes. Nous discutons ensuite la question du traitement local et global des stimuli perceptifs et l’éventualité de déficits au niveau des fonctions exécutives qui pourraient expliquer les différences observées notamment dans le traitement global entre les personnes présentant un Syndrome de Williams (SW) et les personnes en développement normal. Enfin, les hypothèse…
L'instrumentalisation du don et de la lutte pour la reconnaissance dans les communautés en ligne
2013
International audience
Les représentations spatiales de concepts scientifiques : inventaire et diversité
1994
The consultation of twelve journals (French and English language) that deal with science education, for the years 1991 to 1993, allowed us to summarize the use of spatial representations of scientific concepts in didactics research. Two main results were produced from this study : there has not been much work published with spatial representations, and what has been published is very heterogeneous. Analysis of this diversity does not always allow us to understand the authors’ objectives and obliges researchers in didactics to think about the nature and role of spatial representations in the construction of scientific knowledge.