78 research outputs found
Linking initial soil bacterial diversity and polycyclic aromatic hydrocarbons (PAHs) degradation potential
International audienc
The 8 bits 100 MS/s Pipeline ADC for the INNOTEP Project – TWEPP-09
This paper describes the Analog to Digital Converter developed for the front end electronic of the IN2P3 INNOTEP project by the “pole microelectronique Rhone-Auvergne”. (Collaboration between LPC Clermont-Ferrand and IPNL Lyon). This ADC is a 4 stages 2.5 bits per stage pipe line with open loops track and holds and amplifiers. It runs at 100MSamples/s and has 8 bits resolution. The stages used two lines, the gain line and the comparison line, with most operators running in current. The main idea of this current line is to make a first step toward an all in current structure. Currently, this ADC is designed with a 0,35μm SiGe technology
A natural Finsler--Laplace operator
We give a new definition of a Laplace operator for Finsler metric as an
average with regard to an angle measure of the second directional derivatives.
This definition uses a dynamical approach due to Foulon that does not require
the use of connections nor local coordinates. We show using 1-parameter
families of Katok--Ziller metrics that this Finsler--Laplace operator admits
explicit representations and computations of spectral data.Comment: 25 pages, v2: minor modifications, changed the introductio
Deep saltwater in Chalk of North-West Europe: origin, interface characteristics and development over geological time
Persistent and emerging micro-organic contaminants in Chalk groundwater of England and France
Sur la production d’anticorps spécifiques par injections expérimentales de liquide hydatique
PREPARATION OF ULTRA FINE GRAINED MAGNESIA CERAMICS AND THE TEMPERATURE AND POROSITY DEPENDENCE OF THEIR FRACTURE BEHAVIOUR
Des polycristaux de magnésie à grains fins ont été élaborés à 900°C, à partir d'une poudre d'hydroxyde de magnésium, par une technique de frittage réaction sous charge. La vitesse de densification est discutée en termes de déformation superplastique. La résistance à la flexion ainsi que l'énergie effective de surface pour l'initiation de la fracture, γi, ont été déterminées en fonction de la porosité entre la température ambiante et 1200°C. On observe une augmentation rapide de γi avec la température au dessus de 800°C. Ce comportement est à rapprocher de l'observation d'une déformation de type superplastique dans ces domaines de température et taille de grain.Fine grain polycrystals of MgO have been prepared from a Mg (OH)2 powder by reactive hot-pressing at 900°C. The densification rate is discussed in terms of superplastic deformation. The bend strength and the effective surface energy for fracture initiation γi have been determined as a function of porosity between room temperature and 1200°C. A rapid increase in γi with temperature is observed above 800°C. This behaviour is related to the observation of a superplastic deformation in these temperature and grain size ranges
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