Cronstedtite polytypes in the Paris meteorite

Structure and polytypes in thallium superconductors

There have been a number of small contradictions in reports of the structure of the recently discovered thallium superconducting materials, in particular the phase TI,Ba,Ca,Cu,O,, hereafter abbreviated to 2223. The structure has been reported to be pseudo-tetragonal or 14/mmm with a c axis of 3.625, 3.61 or 3.59 nm, and an a axis of 0.54, 0.547 or 0.385 nm. We report here results obtained by hi...

On the Formation of Brucite and Cronstedtite on Ceres

Carbonates in the Martian meteorite

Despite evidence for liquid water at the surface of Mars during the Noachian epoch, the temperature of early aqueous environments has been impossible to establish, raising questions of whether the surface of Mars was ever warmer than today. We address this problem by determining the precipitation temperature of secondary carbonate minerals preserved in the oldest known sample of Mars’ crust—the...

Two new polytypes of 2,4,6-tri­bromo­benzo­nitrile

Three polymorphs of 2,4,6-tri-bromo-benzo-nitrile (RCN), C7H2Br3N, two of which are novel and one of which is a redetermination of the original structure first determined by Carter & Britton [(1972). Acta Cryst. B28, 945-950] are found to be polytypic. Each has a layer structure which differs only in the stacking of the layers. Each layer is composed of mol-ecules associated through C N⋯Br cont...

Université Paris Diderot — Paris 7

This thesis deals with statistical questions raised by the analysis of highdimensional genomic data for cancer research. In the first part, we study asymptotic properties of multiple testing procedures that aim at controlling the False Discovery Rate (FDR), that is, the expected False Discovery Proportion (FDP) among rejected hypotheses. We develop a versatile formalism to calculate the asympto...