Philippe JEAN-PIERRE

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2002
• Auteurs : Philippe LasayguesDavid TanneSerge MensahJean-Pierre Lefebvre
• Organismes : Laboratoire de Mécanique et d'Acoustique [Marseille] Laboratoire de Mécanique et d'Acoustique [Marseille] Laboratoire de Mécanique et d'Acoustique [Marseille] Laboratoire de Mécanique et d'Acoustique [Marseille]
• Publié dans Ultrasonic Imaging le 25/10/2020

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• Type de publi. :
• Date de publi. : 01/01/2002
• Auteurs : Serge MotetMarc Pierrot-DeseillignyChristian ThomAnne RuasMichel KasserMartine FeisselPatrick SillardClaude BoucherMarie-Noëlle BouinJean-Mathieu NocquetGuy WoppelmannOlivier JametFranck JungPhilippe HottierBénédicte BucherSandrine BalleyJean-Georges AffholderD. CoulotJoëlle NicolasPierre ExertierZuheir Altamimi
• Organismes : Institut géographique national [IGN] École nationale des sciences géographiques Méthodes d'Analyses pour le Traitement d'Images et la Stéréorestitution École nationale des sciences géographiques Cartographie et Géomatique Cartographie et Géomatique LAboratoire de Recherche en Géodésie Centre d'Etude et de Recherches en Géodynamique et Astronomie Centre d'Etude et de Recherches en Géodynamique et Astronomie

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Résumé : Ce numéro du Bulletin d'information dresse le bilan des activités de recherche de l'Institut Géographique National en 2001. Les quatre laboratoires de l'IGN présentent leurs travaux en photogrammétrie, traitement d'image, instrumentation, système d'information géographique et géodésie. Quelques sujets sont développés : les traitements automatiques sur les images aériennes pour lever des bâtiments et détecter des changements, l'apport du GPS en aérotriangulation, la représentation des connaissances pour faciliter l'utilisation des données, les travaux d'un projet européen sur la multi-représentation, la modélisation cartographique du réseau routier et deux études géodésiques sur la télémétrie laser et la flexion continentale sous la charge océanique.

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Fichiers liés : IGN-RA_2001.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2002
• Auteurs : Sébastien MassonPascale DelécluseJean-Philippe BoulangerChristophe Menkes
• Organismes : Frontier Research Center for Global Change Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie
• Publié dans Journal of Geophysical Research le 01/11/2020

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• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2002
• Auteurs : Philippe MieleBérangère TourySamuel BernardDavid CornuJean Bouix
• Organismes : Laboratoire des Multimatériaux et Interfaces Laboratoire des Multimatériaux et Interfaces Laboratoire des Multimatériaux et Interfaces Laboratoire des Multimatériaux et Interfaces Laboratoire des Multimatériaux et Interfaces

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2002
• Auteurs : Patrick AmarPascal BalletGeorgia Barlovatz-MeimonArndt G. BeneckeGilles BernotYves BouligandPaul BourguineFranck DelaplaceJean-Marc DelosmeMaurice DemartyItzhak FishovJean Fourmentin-GuilbertJoe FralickJean-Louis GiavittoBernard GleyseChristophe GodinRoberto. IncittiFrançois KépèsCatherine LangeLois Le ScellerCorinne LoutellierFranck MolinaChantal MonnierRené NatowiczVic NorrisNicole OrangeHélène PollardDerek RaineCamille RipollJosette Rouviere-YanivMilton SaierPaul SolerPierre TambourinMichel ThellierPhilippe TracquiDave UsseryJean-Claude VincentJean-Pierre VannierPhilippa WigginsAbdallah ZemirlineOlivier Michel
• Organismes : Laboratoire de Recherche en Informatique Laboratoire de Méthodes Informatiques Dynamic Microbiology - EA 7380 Institut des Hautes Études Scientifiques Laboratoire de Méthodes Informatiques Histophysique Centre de Recherche en Epistémologie Appliquée Laboratoire de Méthodes Informatiques Laboratoire de Méthodes Informatiques Glycobiologie et transports chez les végétaux Ben-Gurion University of the Negev Fondation Scientifique Fourmentin-Guilbert University of Texas Health Science Center Laboratoire de Méthodes Informatiques Institut d'Informatique et de Mathématiques Appliquées de Grenoble Botanique et Modélisation de l'Architecture des Plantes et des Végétations Laboratoire de Méthodes Informatiques Atelier de Génomique Cognitive [Evry] Spectrométrie de Masse Bio-organique [Rouen] Glycobiologie et transports chez les végétaux Spectrométrie de Masse Bio-organique [Rouen] Institut de Biotechnologie-Pharmacologie Glycobiologie et transports chez les végétaux Computer Sciences Department Glycobiologie et transports chez les végétaux Laboratoire de Microbiologie du Froid – Signaux et Micro-Environnement Genopole Research Department of Physics and Astronomy [Leicester] Glycobiologie et transports chez les végétaux Institut de biologie physico-chimique Division of Biology [La Jolla] Genopole Research Genopole Research Glycobiologie et transports chez les végétaux DynaCell Center for Biological Sequence Analysis [Lyngby] Polymères, biopolymères, membranes Hématologie-Oncologie Pédiatrique Genesis Research and Development Corporation Limited Département d'Informatique [Brest] Laboratoire de Méthodes Informatiques
• Publié dans Acta Biotheoretica le 25/10/2020

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Résumé : New concepts may prove necessary to profit from the avalanche of sequence data on the genome, transcriptome, proteome and interactome and to relate this information to cell physiology. Here, we focus on the concept of large activity-based structures, or hyperstructures, in which a variety of types of molecules are brought together to perform a function. We review the evidence for the existence of hyperstructures responsible for the initiation of DNA replication, the sequestration of newly replicated origins of replication, cell division and for metabolism. The processes responsible for hyperstructure formation include changes in enzyme affinities due to metabolite-induction, lipid-protein affinities, elevated local concentrations of proteins and their binding sites on DNA and RNA, and transertion. Experimental techniques exist that can be used to study hyperstructures and we review some of the ones less familiar to biologists. Finally, we speculate on how a variety of in silico approaches involving cellular automata and multi-agent systems could be combined to develop new concepts in the form of an Integrated cell (I-cell) which would undergo selection for growth and survival in a world of artificial microbiology.

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2002
• Auteurs : Jean-Philippe AnkerPhilippe BougerolThierry Jeulin
• Organismes : Mathématiques - Analyse, Probabilités, Modélisation - Orléans Laboratoire de Probabilités et Modèles Aléatoires Laboratoire de Probabilités et Modèles Aléatoires
• Publié dans Revista Matemática Iberoamericana le 31/10/2020

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Résumé : The infinite Brownian loop $\{B_t^0,t\ge 0\}$ on a Riemannian manifold $\mathbb M$ is the limit in distribution of the Brownian bridge of length $T$ around a fixed origin $0$, when $T\to+\infty$. It has no spectral gap. When $\mathbb M$ has nonnegative Ricci curvature, $B^0$ is the Brownian motion itself. When $\mathbb M=G/K$ is a noncompact symmetric space, $B^0$ is the relativized $\Phi_0$--process of the Brownian motion, where $\Phi_0$ denotes the basic spherical function of Harish--Chandra, i.e. the $K$--invariant ground state of the Laplacian. In this case, we consider the polar decomposition $B_t^0=(K_t,X_t)$, where $K_t\in K/M$ and $X_t\in\overline{\mathfrak a_+}$, the positive Weyl chamber. Then, as $t\to+\infty$, $K_t$ converges and $d(0,X_t)/t\to 0$ almost surely. Moreover the processes $\{X_{tT}/\sqrt{T},t\ge 0\}$ converge in distribution, as $T\to+\infty$, to the intrinsic Brownian motion of the Weyl chamber. This implies in particular that $d(0,X_{tT})/\sqrt{T}$ converges to a Bessel process of dimension $D=\operatorname{rank}\mathbb M+2j$, where $j$ denotes the number of positive indivisible roots. An ingredient of the proof is a new estimate on $\Phi_0$.

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Fichiers liés : ABJ.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2002
• Auteurs : Jean LaunayFathia LahmarP. BoissePierre Vacher
• Organismes : Laboratoire de Mécanique des Systèmes et des Procédés Laboratoire de Mécanique des Systèmes et des Procédés Laboratoire de Mécanique des Systèmes et des Procédés Laboratoire SYstèmes et Matériaux pour la MEcatronique
• Publié dans Advanced composites letters le 31/10/2020

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Résumé : Strain measurements are investigated by an image correlation method, for tensile tests, in order to analyse the non-linearities due to crimp. The interest of the method is the possibility to study the phenomena at different scales and so to contribute to a better understanding of the yarn interactions and of their influence on the fabric mechanical behaviour

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Fichiers liés : Launay2002.pdf

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• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2002
• Auteurs : Jean-François SemblatMarc KhamPhilippe GuéguenPierre-Yves BardAnne-Marie Duval
• Organismes : Division Mécanique des Sols des Roches et de la Géologie de l'Ingénieur Laboratoire de Mécanique des Structures Industrielles Durables Laboratoire de Géophysique Interne et Tectonophysique Laboratoire de Géophysique Interne et Tectonophysique ERA 6 Risque sismique

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Résumé : The analysis of seismic site effects generally disregards the influence of surface structures on the free field motion in densely urbanized areas. This paper aims at investigating this particular problem called site-city interaction especially by comparison to the "free-field" amplification process. Several evidences (experimental, analytical, numerical) of the site-city interaction phenomenon have been given in previous work (Guéguen, Bard, Semblat 2000). The influence of site city-interaction could be large for structures having eigenfrequencies close to that of the surface soil layers. Furthermore, the density of structures is also an important governing parameter of the problem. Considering a specific site (Nice, France) where site-city interaction is supposed to be significant, we start from detailed experimental and numerical studies of seismic site effects giving both amplification levels and occuring frequencies, as well as the location of the maximum amplification areas. The influence of site-city interaction is then investigated through various numerical models considering the boundary element method. The effect of surface structures with variable urban densities is analysed to estimate the contribution of overall site-city interaction on surface motion distribution. The main goal of the paper is to estimate the influence of site-city interaction not only on amplification levels (the influence can be small), but also on the modification of both main amplification frequencies and location of the maximum amplification areas. The main conclusion of this work is to show the modifications of the free-field amplification due to site-city interaction and leading to a specific urban field amplification.

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Fichiers liés : 7ncee_semblat_et_al.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2002
• Auteurs : Loys BodinMagali San CristobalFrédéric LecerfPhilippe MulsantBernard BibéDaniel LajousJean-Pierre BellocFrancis EychenneYves AmiguesJean-Michel Elsen
• Organismes :
• Publié dans Genetics Selection Evolution le 25/10/2020

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Résumé : Inheritance of the ovulation rate (OR) in the Lacaune meat breed was studied through records from a small nucleus of 36 hyper-prolific ewes screened on farms on the basis of their natural litter size, and from progeny data of three selected Lacaune sires. These sires were chosen at the AI centre according to their breeding values estimated for the mean and the variability of their daughters' litter size. Non-carrier Lacaune dairy ewes were inseminated to produce 121 F1 daughters and 27 F1 sons. Twelve sons (four from each sire) were used in turn to inseminate non-carrier Lacaune dairy ewes providing 260 BC progeny ewes. F1 and BC progeny were brought from private farms and gathered after weaning on an experimental farm where ovulation rates were recorded in the first and second breeding seasons. With an average of 6.5 records each, the mean OR of hyper-prolific ewes was very high (5.34), and 38.4% of records showed a rate of 6 or more. F1 data showed high repeatability of OR ($r=0.54$) within ewe, with significant variability among ewes. High OR ($\geq 4$) were observed in each family. A segregation analysis provided a significant likelihood ratio and classified the three founders as heterozygous. BC ewes also displayed high repeatability of OR ($r=0.47$) and the mean OR varied considerably between families (from 1.24 to 1.78). Seven of the 12 BC families presented high-ovulating ewes (at least one record $\geq 4$) and segregation analysis yielded a highly significant likelihood ratio as compared to an empirical test distribution. The high variability of the mean ovulation rate shown by a small group of daughters of BC ewes inseminated by putative carrier F1 rams, and the very high ovulation rate observed for some of these ewe lambs, confirmed the segregation of a major gene with two co-dominant alleles borne by an autosome. The difference between homozygous non-carriers and heterozygous ewes was about one ovulation on the observed scale and 2.2 standard deviations on the underlying scale.

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Fichiers liés : hal-00894421.pdf

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• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2002
• Auteurs : Jean-Philippe CostesPierre Larricq
• Organismes :
• Publié dans Annals of Forest Science le 26/10/2020

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Résumé : High cutting speed machining processes have been used for about 10 years for metals. This technology presents many advantages related to output and surface quality. For timber machining, commonly used velocities are already high. However, literature about cutting velocity function during a machining process is rare. Nevertheless, some published results have shown the effect of speed on chip formation. In order to perform experiments at high cutting speeds, we used a prototype model of a CN routing machine, which allowed us to conduct machining from 3 m s$^{-1}$ to 62 m s$^{-1}$. Surface analysis was carried out by an optical roughness measurement device. The wood species studied is beech. Tests have been performed with constant chip thickness value.

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Fichiers liés : hal-00881899.pdf

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