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

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