27 research outputs found
Analyse 3d de la marche en pratique clinique après ligamentoplastie du genou par DIDT : utilisation du système KNEE KG
Accelerating Cosmic Microwave Background map-making procedure through preconditioning
Estimation of the sky signal from sequences of time ordered data is one of
the key steps in Cosmic Microwave Background (CMB) data analysis, commonly
referred to as the map-making problem. Some of the most popular and general
methods proposed for this problem involve solving generalised least squares
(GLS) equations with non-diagonal noise weights given by a block-diagonal
matrix with Toeplitz blocks. In this work we study new map-making solvers
potentially suitable for applications to the largest anticipated data sets.
They are based on iterative conjugate gradient (CG) approaches enhanced with
novel, parallel, two-level preconditioners. We apply the proposed solvers to
examples of simulated non-polarised and polarised CMB observations, and a set
of idealised scanning strategies with sky coverage ranging from nearly a full
sky down to small sky patches. We discuss in detail their implementation for
massively parallel computational platforms and their performance for a broad
range of parameters characterising the simulated data sets. We find that our
best new solver can outperform carefully-optimised standard solvers used today
by a factor of as much as 5 in terms of the convergence rate and a factor of up
to in terms of the time to solution, and to do so without significantly
increasing the memory consumption and the volume of inter-processor
communication. The performance of the new algorithms is also found to be more
stable and robust, and less dependent on specific characteristics of the
analysed data set. We therefore conclude that the proposed approaches are well
suited to address successfully challenges posed by new and forthcoming CMB data
sets.Comment: 19 pages // Final version submitted to A&
Last Men Standing: Chlamydatus Portraits and Public Life in Late Antique Corinth
Notable among the marble sculptures excavated at Corinth are seven portraits of men wearing the long chlamys of Late Antique imperial office. This unusual costume, contemporary portrait heads, and inscribed statue bases all help confirm that new public statuary was created and erected at Corinth during the 4th and 5th centuries. These chlamydatus portraits, published together here for the first time, are likely to represent the Governor of Achaia in his capital city, in the company of local benefactors. Among the last works of the ancient sculptural tradition, they form a valuable source of information on public life in Late Antique Corinth
Protein carbonylation during natural leaf senescence in winter wheat, as probed by fluorescein-5-thiosemicarbazide
Leaf senescence is characterised by a massive degradation of proteins in order to recycle nitrogen to other parts of the plant, such as younger leaves or developing grain/seed. Protein degradation during leaf senescence is a highly regulated process and it is suggested that proteins to be degraded are marked by an oxidative modification (carbonylation) that makes them more susceptible to proteolysis. However, there is as yet no evidence of an increase in protein carbonylation level during natural leaf senescence. The aim of our study was thus to monitor protein carbonylation level during the process of natural senescence in the flag leaf of field-grown winter wheat plants. For this purpose, we adapted a fluorescence-based method using fluorescein-5-thiosemicarbazide (FTC) as a probe for detecting protein carbonyl derivatives. As used for the first time on plant material, this method allowed the detection of both quantitative and qualitative modifications in protein carbonyl levels during the last stages of wheat flag leaf development. The method described herein represents a convenient, sensitive and reproducible alternative to the commonly used 2,4-dinitrophenylhydrazine (DNPH)-based method. In addition, our analysis revealed changes in protein carbonylation level during leaf development that were associated with qualitative changes in protein abundance and carbonylation profiles. In the senescing flag leaf, protein carbonylation increased concomitantly with a stimulation of endoproteolytic activity and a decrease in protein content, which supports the suggested relationship between protein oxidation and proteolysis during natural leaf senescenc
Co-refinement of fault surfaces : convexification process
The aim of this work is to develop an algorithm that
allows the common refinement of non-coincident meshes composed of
arbitrary 3D surfaces elements (triangles, quad elements). This
study is motivated by computations in geologic applications which
involve complex geometries with heterogeneous components and
geologic faults. The resulting meshes are linked through a
continuous bijection in order to ensure the accuracy and the
conservativity of the data transferring through the surfaces. The
strategy adopted consists, first, of the simultaneous
convexification of the two surfaces by the mean of points
connections. A projection according to given normals is then
achieved. The mesh quality improved by applying a surface smoothing
should accelerate the procedure convergence
Interest of postural control evaluation after ACL hamstring tendon reconstruction: A prospective monocentric study
Intérêt de l’évaluation du contrôle postural après ligamentoplastie du LCA par transplant DIDT : étude prospective monocentrique contrôlée
Vacuolar endoproteolytic activities and protein carbonylation levels in leaf as a model for depicting ozone tolerance and sensitivy in winter wheat (Trticum aestivum L.).
Vacuolar endoproteolytic activities and protein carbonylation levels in leaf as a model for depicting ozone tolerance and sensitivy in winter wheat (Trticum aestivum L.).. 27. Task Force Meeting of the ICP Vegetatio