4,448 research outputs found
A fully objective Bayesian approach for the Behrens-Fisher problem using historical studies
For in vivo research experiments with small sample sizes and available
historical data, we propose a sequential Bayesian method for the Behrens-Fisher
problem. We consider it as a model choice question with two models in
competition: one for which the two expectations are equal and one for which
they are different. The choice between the two models is performed through a
Bayesian analysis, based on a robust choice of combined objective and
subjective priors, set on the parameters space and on the models space. Three
steps are necessary to evaluate the posterior probability of each model using
two historical datasets similar to the one of interest. Starting from the
Jeffreys prior, a posterior using a first historical dataset is deduced and
allows to calibrate the Normal-Gamma informative priors for the second
historical dataset analysis, in addition to a uniform prior on the model space.
From this second step, a new posterior on the parameter space and the models
space can be used as the objective informative prior for the last Bayesian
analysis. Bayesian and frequentist methods have been compared on simulated and
real data. In accordance with FDA recommendations, control of type I and type
II error rates has been evaluated. The proposed method controls them even if
the historical experiments are not completely similar to the one of interest
Sol–gel processing and characterization of (RE-Y)-zirconia powders for thermal barrier coatings
The effect of doping on the structural, morphological and thermal properties of ZrO2–XO1.5 (X=Y, La, Sm, Er) solid solutions for thermal barrier (TBC) applications was investigated. Oxide powders of various compositions from 9.7 to 40 mol% XO1.5 (X=Y, La, Sm, Er) were synthesised by the sol–gel route. The structural analysis of the powders was performed using X-ray diffraction analysis coupled with Rietveld refinements and the measurement of their specific surface area with the BET method. For each rare earth dopant, the morphology of the powders varies from monoliths to agglomerates of thinner particles when the doping amount increases. In order to determine the specific heat, the thermal diffusivity at room temperature and the thermal expansion coefficient of some selected compositions, DSC, laser thermal diffusivity and hightemperature dilatometry measurements were performed on samples densified by Spark Plasma Sintering. Working thermal characterisation indicated that zirconia doped with 30 mol% SmO1.5 and ErO1.5 have better insulation properties and a lower thermal expansion coefficient than our reference YSZ ceramic. These various compositions are very promising for the elaboration of multilayer TBCs by the sol–gel process
Prosper: image and robot-guided prostate brachytherapy
Brachytherapy for localized prostate cancer consists in destroying cancer by
introducing iodine radioactive seeds into the gland through hollow needles. The
planning of the position of the seeds and their introduction into the prostate
is based on intra-operative ultrasound (US) imaging. We propose to optimize the
global quality of the procedure by: i) using 3D US; ii) enhancing US data with
MRI registration; iii) using a specially designed needle-insertion robot,
connected to the imaging data. The imaging methods have been successfully
tested on patient data while the robot accuracy has been evaluated on a
realistic deformable phantom
Design of mesoporous carbon fibers from a poly(acrylonitrile) based block copolymer by a simple templating compression moulding process
Mesoporous carbon fibers were prepared by controlled pyrolysis of poly(vinyl acetate)-b-poly(acrylonitrile) (PVAc-b-PAN) copolymer located inside a cylindrical nanoporous template. A melt-compression method was developed to help the penetration of the infusible copolymer inside the template without the use of any solvent that ensures the formation of completely filled fibers instead of nanotubes. The influence of the composition of the PVAc-b-PAN copolymer and the heating rate during pyrolysis on the porous morphology of the fibers was studied by transmission electron microscopy (TEM)
Etude physico-chimique, bactériologique et biologique d'une rivière franco-suisse: La Drize
Drize is a highly polluted river, the pollution being essentially due to the disposal of water from a waste water treatment plant situated in Collonges-sous-Salève. In addition, water run off from agricultural land and accidental introduction of chemicals contribute to this pollution.
The benthic macrofauna of its basin is found to be very poor. The Collonges-sous-Salève waste water treatment plant has been linked to the Geneva water treatment network since november 1990. Although some decrease in pollution of the river Drize has been observed, it still belongs to
the highly polluted class of water
- …