Hydrogen production during the irradiation of gaseous organic compounds: advantage of an extracted beam

ACE, Accélérateur, NIMBInternational audienceThis paper presents a fundamental study of the radiolysis of gaseous organic molecules induced by proton beam. For that purpose, a specific extracted beam line associated with a gas irradiation cell was set up on the 4 MV facility of the Institut de Physique Nucléaire of Lyon. The first experiments have been performed with gaseous alkanes and alkenes. The gaseous species formed during irradiation are analysed by an on-line gas chromatography instrument equipped with two detectors. In order to test our experimental faiclity, we have studied the influence of irradiation parameters (duration, beam intensity, pressure) on the production of hydrogen. In the case of propane, the radiolytic yield value of hydrogen G(H$_2$) is equal to 3.7 for total does in the range of 0.4 to 2.3 MGy at atmospheric pressure

Mice knock out for the histone acetyltransferase p300/CREB binding protein-associated factor develop a resistance to amyloid toxicity

International audienc

Use of RBS to validate Europium surface implantation as a marker for the corrosion study of zirconia

ACEWe present an unsupervised approach to cluster sequences. This method is inspired by topology learning methods for hidden Markov models, and is built upon the definition of a distance between Markov models. This type of technique may be used to learn Markovian character models from data or to identify allographs or handwriting styles

Alteration of fuel cladding tubes measured by fission fragment spectroscopy on line

There have been few studies to date on how French researchers are using electronic journals in their work. Under a national program for document digitization in higher education and research, a qualitative study was conducted recently at the Jussieu Campus in Paris, with 25 researchers and doctoral students and 9 documentalists. The main disciplines covered were Physics, Chemistry and Biology, with some representatives from Mathematics, Computer Science and Earth Sciences. A user typology was built up, and several of the findings agree substantially with those in the (mainly Anglo-Saxon) literature, which demonstrate the importance of factors such as the discipline concerned and the immediate working environment of researchers, including equipment, local practice, and the resources that are promoted or made available. Other more subjective factors also need to be taken into account