A simple preconditioned domain decomposition method for electromagnetic scattering problems

We present a domain decomposition method (DDM) devoted to the iterative solution of time-harmonic electromagnetic scattering problems, involving large and resonant cavities. This DDM uses the electric field integral equation (EFIE) for the solution of Maxwell problems in both interior and exterior subdomains, and we propose a simple preconditioner for the global method, based on the single layer operator restricted to the fictitious interface between the two subdomains.Comment: 23 page

Les écuries de chantilly : un palais à la gloire du cheval

Fait du prince, les écuries sont à Chantilly une puissance autonome qui s’insère dans le renouveau urbain de la ville. Edifiées par Jean Aubert sur ordre du duc de Bourbon, entre 1719 et 1740, elles intègrent un système de références aux écuries françaises les plus célèbres des XVIIe et XVIIIe siècles savamment mis en scènes, de même qu’une filiation immédiate avec les plus belles réalisations de Jules Hardouin-Mansart. Passées à la postérité du vivant de M. le Duc, une descendance illustre à La Roche-Guyon, Bizy ou l’Isle-Adam notamment, perpétua l’exemple condéen.Government fiat, stables are in Chantilly an autonomous power which fits into the urban revival of the city. Built by Jean Aubert on order of the duke of Bourbon, between 1719 and 1740, they integrate a system of references into the most famous French stables of the XVIIth and XVIIIth centuries skilfully staged, as well as an immediate filiation with Jules Hardouin-Mansart's most beautiful realizations. Gone down in history the alive of M. le Duc, an illustrious descent in Roche-Guyon, Bizy or Isle-Adam in particular, immortalized the condéen example.Als hoheitliche Baumaßnahme genießen die Pferdestallungen in Chantilly einen autonomen Status, der in engem Zusammenhang mit der städtebaulichen Erneuerung der Stadt zu betrachten ist. Die zwischen 1719 und 1740 von Jean Aubert im Auftrag des Herzogs von Bourbon erbauten Stallungen weisen ein System komplexer, sorgfältig in Szene gesetzter Referenzen auf die berühmtesten französischen Marställe des 17. und 18. Jahrhunderts auf und nehmen gleichzeitig direkt Bezug auf herausragende Bauten von Jules Hardouin-Mansart. Weit über die Lebenszeit des als „Monsieur le Duc“ bekannten Prince de Condé hinaus dient das Beispiel der Stallungen von Chantilly als Vorbild für prächtige Marställe in La Roche-Guyon, Bizy oder L’Isle-Adam

L’organisation socio-économique des écuries de Chantilly durant la première moitié du XVIIIe siècle

Ordonnée par Louis-Henri de Bourbon-Condé (1692-1740) entre 1719 et 1735, d’après les plans de Jean Aubert, l’érection des écuries de Chantilly s’inscrit dans un plan d’aménagement du site passant par la nouvelle urbanisation du bourg de Chantilly. Leur organisation socio-économique traduit un certain idéal de consommation aristocratique. La diversité des chevaux, la multiplication des voitures, le personnel, les formes, les acteurs, et les modalités de la consommation, soulignent l’originalité et l’importance de cette noble occupation, dont l’étude a été rendue en partie possible grâce aux livres de comptes conservés au musée Condé à Chantilly.Commissioned by Louis-Henri de Bourbon-Condé (1692-1740) between 1719 and 1735, and built from plans drawn up by Jean Aubert, the construction of the Great Stables of Chantilly was an important feature in the site development plan and the urbanisation of the village of Chantilly. Their powerful architecture has shaped the surrounding landscape, creating an impressive vision, and their socio-economic structure reflects a certain ideal in the lifestyle of the aristocracy. The variety of horses, the multitude of carriages, the staff members, the customs and traditions surrounding this lifestyle and those who kept them, highlight the originality and importance of this noble occupation, studies of which have in part been made possible thanks to account books preserved at the Musée Condé in Chantilly

Integral equations requiring small numbers of Krylov-subspace iterations for two-dimensional smooth penetrable scattering problems

This paper presents a class of boundary integral equations for the solution of problems of electromagnetic and acoustic scattering by two-dimensional homogeneous penetrable scatterers with smooth boundaries. The new integral equations, which, as is established in this paper, are uniquely solvable Fredholm equations of the second kind, result from representations of fields as combinations of single and double layer potentials acting on appropriately chosen regularizing operators. As demonstrated in this text by means of a variety of numerical examples (that resulted from a high-order Nyström computational implementation of the new equations), these “regularized combined equations” can give rise to important reductions in computational costs, for a given accuracy, over those resulting from previous iterative boundary integral equation solvers for transmission problems

Pore pressures in clays due to cone penetration

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1980.MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING.Vita.Bibliography: p. 482-499.by Jacques-Noel Levadoux.Ph.D

Compartmentalisation and localisation of the translation initiation factor (eIF) 4F complex in normally growing fibroblasts

Previous observations of association of mRNAs and ribosomes with subcellular structures highlight the importance of localised translation. However, little is known regarding associations between eukaryotic translation initiation factors and cellular structures within the cytoplasm of normally growing cells. We have used detergent-based cellular fractionation coupled with immunofluorescence microscopy to investigate the subcellular localisation in NIH3T3 fibroblasts of the initiation factors involved in recruitment of mRNA for translation, focussing on eIF4E, the mRNA cap-binding protein, the scaffold protein eIF4GI and poly(A) binding protein (PABP). We find that these proteins exist mainly in a soluble cytosolic pool, with only a subfraction tightly associated with cellular structures. However, this "associated" fraction was enriched in active "eIF4F" complexes (eIF4E.eIF4G.eIF4A.PABP). Immunofluorescence analysis reveals both a diffuse and a perinuclear distribution of eIF4G, with the perinuclear staining pattern similar to that of the endoplasmic reticulum. eIF4E also shows both a diffuse staining pattern and a tighter perinuclear stain, partly coincident with vimentin intermediate filaments. All three proteins localise to the lamellipodia of migrating cells in close proximity to ribosomes, microtubules, microfilaments and focal adhesions, with eIF4G and eIF4E at the periphery showing a similar staining pattern to the focal adhesion protein vinculin

Naturalised Vitis Rootstocks in Europe and Consequences to Native Wild Grapevine

The genus Vitis is represented by several coexisting species in Europe. Our study focuses on naturalised rootstocks that originate in viticulture. The consequences of their presence to the landscape and to native European species (Vitis vinifera ssp. silvestris) are evaluated. This study compares ecological traits (seven qualitative and quantitative descriptors) and the genetic diversity (10 SSR markers) of populations of naturalised rootstocks and native wild grapevines. 18 large naturalised rootstock populations were studied in the Rhône watershed. Wild European grapevines are present in four main habitats (screes, alluvial forests, hedges, and streamside hedges). In contrast, naturalised rootstock populations are mainly located in alluvial forests, but they clearly take advantage of alluvial system dynamics and connectivity at the landscape level. These latter populations appear to reproduce sexually, and show a higher genetic diversity than Vitis vinifera ssp. silvestris. The regrouping of naturalised rootstocks in interconnected populations tends to create active hybrid swarms of rootstocks. The rootstocks show characters of invasive plants. The spread of naturalised rootstocks in the environment, the acceleration of the decline of the European wild grapevine, and the propagation of genes of viticultural interest in natural populations are potential consequences that should be kept in mind when undertaking appropriate management measures