Philippe JEAN-PIERRE

---

• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2003
• Auteurs : Jean MartinetYves ChiaramellaPhilippe MulhemIadh Ounis
• Organismes : FOX MIIRE Communication Langagière et Interaction Personne-Système Modélisation et Recherche d’Information Multimédia [Grenoble] School of Computing Science [Glasgow]

---

Résumé : We present in this paper a relational approach for indexing and retrieving photographs from a collection. Instead of using simple keywords as an indexing language, we propose to use star-graphs as document descriptors. A star-graph is a conceptual graph that contains a single relation, with some concepts linked to it. They are elementary pieces of information describing combinations of concepts. We use star-graphs as descriptors - or index terms - for image content representation. This allows for relational indexing and expression of complex user needs, in comparison to classical text retrieval, where simple keywords are generally used as document descriptors. We present a document representation model, a weighting scheme for star-graphs inspired by the tf.idf used in text retrieval. We have applied our model to image retrieval, and show the system evaluation results.

---

Fichiers liés : cbmi03-submitted.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Guillaume MorinFarid JuillotCorinne CasiotOdile BruneelJean-Christian PersonnéFrançoise Elbaz-PoulichetMarc LeblancPhilippe IldefonseGeorges Calas
• Organismes : Institut de minéralogie et de physique des milieux condensés Institut de minéralogie et de physique des milieux condensés Hydrosciences Montpellier Hydrosciences Montpellier Hydrosciences Montpellier Hydrosciences Montpellier Hydrosciences Montpellier Institut de minéralogie et de physique des milieux condensés Institut de minéralogie et de physique des milieux condensés
• Publié dans Environmental Science and Technology le 24/10/2020

---

Résumé : The oxidation of Fe(II) in acid mine drainage (AMD) leads to the precipitation of Fe(III) compounds which may incorporate toxic elements, such as arsenic (As), within their structure or adsorb them at their surface, thus limiting their mobility. The present work provides evidence for spatial and seasonal variations of microbial activity that influence arsenite oxidation and As immobilization in the heavily contaminated AMD from the Carnoulès mine, Gard, France ([As III] = 80 to 280 mg·L-1 in the acidic spring draining the waste-pile). In the first tens of meters of the AMD, the rapid oxidation of Fe(II) leads to the coprecipitation of large amounts of As with Fe(III) in bacterial mats. XRD, XANES, and SEM analyses of sediments and stromatolite samples revealed the unusual formation of As(III)-rich compounds, especially nanocrystalline tooeleite, Fe6(AsO3)4(SO4)(OH)4·4H2O, a rare ferric arsenite sulfate oxy-hydroxide mineral, together with XRD-amorphous mixed As(III)/As(V)-Fe(III) oxy-hydroxide compounds. In the wet season, the suspended sediments of the upstream zone essentially consist of tooeleite associated with am-As(III)-Fe(III) oxy-hydroxides, while am-As(V)-Fe(III) oxy-hydroxides, having As:Fe molar ratios as high as 0.6-0.8, dominate in the dry season. Comparing natural and bioassay samples revealed that the formation of As(III)-rich compounds in the wet season may be related to the metabolic activity of bacterial strains able to oxidize Fe(II) but not As(III). One of these strains, having an Acidithiobacillus ferrooxidans genotype, has been isolated from the Carnoulès AMD. In contrast, the formation of As(V)-rich compounds in the dry season can be related to both biotic and abiotic oxidation of As(III) to As(V). Some Thiomonas strains isolated from the Carnoulès AMD were shown to be able to catalyze the oxidation of As(III) to As(V) in solution. Therefore, they can promote the formation of mixed As(V)-Fe(III) oxy-hydroxides, provided enough Fe(II) oxidizes. These results yield a better understanding of natural processes at this site and may help in designing efficient As-removal processes.

---

Fichiers liés : Morin et al 2003.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Nicolas MercierNicolas MercierPierre FrèrePhilippe BlanchardJean RoncaliMagali AllainChristophe PasquierAmédée Riou
• Organismes : Laboratoire de Physique des Solides - HP
• Publié dans Inorganic Chemistry le 31/10/2020

---

Résumé : 2,2′-bithiophene derivatives, 5-ammoniumethylsulfanyl-2,2′-bithiophene (AESBT) and 5,5′-bis(ammoniumethylsulfanyl)-2,2′-bithiophene (BAESBT), have been designed for their incorporation in organic-inorganic materials based on iodometalates. Three layered compounds, (BAESBT)Pbl4, (AESBT) 4Pb3l10, and (AESBT)3Bl 2l9, have been synthesized as crystals from slowly cooled aqueous solution containing metal halide and bithiophene derivative salts. When starting from the diammonium cation, (BAESBT)Pbl4 hybrid perovskite is obtained. (BAESBT)Pbl4 adopts a triclinic cell (P1̄) with the lattice parameters a = 8.4741(5) Å, b = 8.9255(6) Å, c = 16.876(1) Å, α = 88.328(5)°, β = 81.806(4)°, γ = 88.864(5)°, Z = 2. In the structure, Pbl42- perovskite sheets and diammonium cation layers alternate along c. The incorporation of the corresponding monoammonium cation (AESBT) leads to a head to tail arrangement of the molecules in the (AESBT)4Pb 3l10 hybrid, precluding the formation of the perovskite layers. (AESBT)4Pb3l10 is orthorhombic, Pna21, with a = 38.333(4) Å, b = 22.239(3) Å, c = 8.448(2) Å, Z = 4. The structure consists of corrugated layers of Pb 3l104- separated by organic layers of monoammonium cations. A similar relative situation of molecules in organic layers is observed in (AESBT)3Bi2l9, with the inorganic sheets being built up from Bi2l93- entities. (AESBT)3Bi2l9 crystallizes in an orthorhombic cell (P212121) with a = 8.4564(6) Å, b = 21.368(2) Å, c = 30.747(2) Å, Z = 4. In the three compounds, the molecular packings appear different, underlining the interplay between both organic and inorganic components. New packings are stabilized, as illustrated by an original mixed kappa-alpha type arrangement of the bithiophene units in (AESBT)3Bi2l9. Furthermore, molecular interactions, especially of S...S type, appear stronger in the hybrids based on the monoammonium cations. The electrical conductivity of a (BAESBT)Pbl4 single crystal has also been investigated, revealing a semiconductive behavior with a characteristic energy of E g = 2.535 eV.

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Thierry PellarinWigneron J.-P.Jean-Christophe CalvetPhilippe Waldteufel
• Organismes : Centre national de recherches météorologiques Unité de bioclimatologie Centre national de recherches météorologiques Institut Pierre-Simon-Laplace
• Publié dans Journal of Geophysical Research le 01/11/2020

---

Résumé : A technique to retrieve surface soil moisture was assessed at the global scale using a synthetic data set of L-band (1.4 GHz) brightness temperatures T-B for 2 years, 1987 and 1988. The global T-B database consists of half-degree continental pixels and accounts for within-pixel heterogeneity, on the basis of 1 km resolution land cover maps. The retrievals were performed using a three-parameter inversion method applied to the L-band Microwave Emission of Biosphere model ( L-MEB). Three land surface variables were retrieved simultaneously from the multiangular and dual-polarization T-B data: surface soil moisture wg, vegetation optical depth tau, and surface temperature T-S. The retrievals were obtained in two T-S configurations: T-S was either unknown or known with an uncertainty of 2 K. Applying these two assumptions, global maps of the estimated accuracy of the wg retrievals were produced, and the capability of the T-B to monitor wg was evaluated. A sensitivity study was carried out in order to analyze the effect of the main parameters that may affect the retrieval accuracy: the fraction cover of open water and forests, frozen soil conditions, and the radiometric noise on T-B. These results contribute to the better definition of the potential of the observations from future spaceborne missions such as the Soil Moisture and Ocean Salinity ( SMOS) project.

---

Fichiers liés : 2002JD003086.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Jean‐sébastien LauretChristophe VoisinGuillaume CassaboisClaude DelalandePhilippe RoussignolOliver JostLaurence Goux-Capes
• Organismes : Laboratoire Pierre Aigrain Motorola Labs Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Laboratoire Pierre Aigrain Technische Universität Dresden = Dresden University of Technology Motorola Labs Laboratoire d'Electronique Moléculaire
• Publié dans Physical Review Letters le 02/11/2020

---

Résumé : Time-resolved carrier dynamics in single wall carbon nanotubes is investigated by means of two-color pump-probe experiments. The recombination dynamics is monitored by probing the transient photo-bleaching observed on the first interband transition of the semi-conducting tubes. The carrier dynamics takes place on a one picosecond time scale which is one order of magnitude slower than in graphite. Transient photo-induced absorption is observed with exactly the same dynamics for non-resonant probe conditions and is interpreted as a global red shift of the $\pi-$plasmon resonance. We show that the opening of the band gap in semi-conducting carbon nanotubes determines the non-linear response dynamics over the whole visible and near-infrared spectrum.

---

Fichiers liés : Voisin.pdf

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Sébastien Le JanCéline BazilleAurélie CazesCatherine MonnotNoël LamandéJudith FavierJosette PhilippeMathilde SibonyJean-Marie GascPierre CorvolStéphane Germain
• Organismes : Angiogénèse embryonnaire et pathologique Pathologie vasculaire et endocrinologie rénale - Chaire de médecine expérimentale Centre interdisciplinaire de recherche en biologie
• Publié dans American Journal of Pathology le 26/10/2020

---

Résumé : Ischemic and solid tumor tissues are less well perfused than normal tissue, leading to metabolic changes and chronic hypoxia, which in turn promotes angiogenesis. We identified human angiopoietin-like 4 (angptl4) as a gene with hypoxia-induced expression in endothelial cells. We showed that the levels of both mRNA and protein for ANGPTL4 increased in response to hypoxia. When tested in the chicken chorioallantoic membrane assay, ANGPTL4 induced a strong proangiogenic response, independently of vascular endothelial growth factor. In human pathology, ANGPTL4 mRNA is produced in ischemic tissues, in conditions such as critical leg ischemia. In tumors, ANGPTL4 is produced in the hypoxic areas surrounding necrotic regions. We observed particularly high levels of ANGPTL4 mRNA in tumor cells of conventional renal cell carcinoma. Other benign and malignant renal tumor cells do not produce ANGPTL4 mRNA. This molecule therefore seems to be a marker of conventional renal cell carcinoma. ANGPTL4, originally identified as a peroxisome proliferator-activated receptor alpha and gamma target gene, has potential for use as a new diagnostic tool and a potential therapeutic target, modulating angiogenesis both in tumors and in ischemic tissues. This study also suggests that ANGPTL4 may provide a link between metabolic disorders and hypoxia-induced angiogenesis.

---

Source

---

• Type de publi. : Rapport
• Date de publi. : 01/01/2003
• Auteurs : R. LaplanaFrédéric ZahmLaurent PietJean-Marie LescotFrançois BirgandThierry BioteauPierre BordenaveNicolas A TurpinPhilippe BontemsG. RotillonI. BarlundM. KaljonenS. TattariF. FeichtingerP. StraussR. HaverkampM. GarnierAntonio Lo PortoG. BenigniA. LeoneM.N. RipaO.M. EkloE. Romstad
• Organismes : Aménités et dynamiques des espaces ruraux Gestion environnementale et traitement biologique des déchets Institut National de la Recherche Agronomique UNIVERSITE NANTERRE FINNISH ENVIRONMENT INSTITUTE FIN BUNDESAMT FUR WASSERWIRTSCHAFT AUT Université Grenoble Alpes [2016-2019] INSTITUTO DI RICERCA SULLE ACQUE ITA Università degli studi della Tuscia = Tuscia University [Viterbo] Norwegian Crop Research Institute AGRICULTURAL UNIVERSITY OF NORWAY NOR

---

Résumé : AgriBMPWater is an european research project of the 5th RTD Framework program (Key Action : "Sustainable Management and Quality of Water). This third periodic report presents the progress of the project during period: July 1st 2002 - June 30th 2003. An abstract of the scientific progress is in section 2.

---

Source

---

• Type de publi. : Ouvrage (y compris édition critique et traduction)
• Date de publi. : 01/01/2003
• Auteurs : Philippe BorgardJean-Pierre BrunMaurice Picon
• Organismes : Centre Camille Jullian - Histoire et archéologie de la Méditerranée et de l'Afrique du Nord de la protohistoire à la fin de l'Antiquité Centre Jean Berard Archéométrie et archéologie : Origine, Datation et Technologies des matériaux

---

Source

---

• Type de publi. : Communication dans un congrès
• Date de publi. : 01/01/2003
• Auteurs : Pierre-Alain MullerPhilippe StuderJean Bézivin
• Organismes : Laboratoire d'Informatique de Nantes Atlantique

---

Résumé : no abstract

---

Source

---

• Type de publi. : Article dans une revue
• Date de publi. : 01/01/2003
• Auteurs : Matthieu LengaigneJean-Philippe BoulangerChristophe MenkesGurvan MadecPascale DelécluseÉric GuilyardiJulia Slingo
• Organismes : Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie Laboratoire d'océanographie dynamique et de climatologie CGAM CGAM
• Publié dans Journal of Climate le 02/11/2020

---

Source