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Fujisawa, K.,Ka, I.,Le Borgne, V.,Kang, C.S.,Kobayashi, K.,Muramatsu, H.,Hayashi, T.,Kim, Y.A.,Endo, M.,Terrones, M.,El Khakani, M.A. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.96 No.-
<P>Carbon nanotubes (CNTs)/lead sulfide (PbS) quantum dots (QDs) nanohybrids have been synthesized through the controlled decoration of CNTs by PbS-QDs by means of the pulsed laser deposition technique. The size of the PbS-QDs and their surface coverage of the CNTs' surface are monitored through the number of laser ablation pulses. Here, while comparing both single-walled (SW) and double-walled (DW) CNTs based nanohybrids, focus is put on the investigation of their interfacial structure and the effect of inner tube. Anchoring PbS through direct sulfur-carbon chemical bonding between CNTs' outer wall and PbS-QDs, which are thought to be profitable for efficient charge transfer but not for charge transport along CNT's tube axis, are confirmed by Raman spectroscopy and X-ray photoelectron spectroscopy. In the case of double-walled CNTs (DWCNTs), inner tube remains unaffected by ablated PbS species, then it serves efficient conduction way for transferred photo-generated charges. This unique feature of the DWCNTs based nanohybrid, where the photocharges are generated by the chemically bonded PbS-QDs to the outer tube and then efficiently conveyed by the inner tube of the nanotubes, is highly likely at the origin of their significantly higher photo-activity (several hundred times than in SWCNTs-based nanohybrids). (C) 2015 Elsevier Ltd. All rights reserved.</P>
Kang, Peter K.,Dentz, Marco,Le Borgne, Tanguy,Lee, Seunghak,Juanes, Ruben C.M.L. Publications 2017 ADVANCES IN WATER RESOURCES Vol.106 No.-
<P><B>Abstract</B></P> <P>We investigate tracer transport on random discrete fracture networks that are characterized by the statistics of the fracture geometry and hydraulic conductivity. While it is well known that tracer transport through fractured media can be anomalous and particle injection modes can have major impact on dispersion, the incorporation of injection modes into effective transport modeling has remained an open issue. The fundamental reason behind this challenge is that—even if the Eulerian fluid velocity is steady—the Lagrangian velocity distribution experienced by tracer particles evolves with time from its initial distribution, which is dictated by the injection mode, to a stationary velocity distribution. We quantify this evolution by a Markov model for particle velocities that are equidistantly sampled along trajectories. This stochastic approach allows for the systematic incorporation of the initial velocity distribution and quantifies the interplay between velocity distribution and spatial and temporal correlation. The proposed spatial Markov model is characterized by the initial velocity distribution, which is determined by the particle injection mode, the stationary Lagrangian velocity distribution, which is derived from the Eulerian velocity distribution, and the spatial velocity correlation length, which is related to the characteristic fracture length. This effective model leads to a time-domain random walk for the evolution of particle positions and velocities, whose joint distribution follows a Boltzmann equation. Finally, we demonstrate that the proposed model can successfully predict anomalous transport through discrete fracture networks with different levels of heterogeneity and arbitrary tracer injection modes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Injection modes have major impact on anomalous transport in DFNs. </LI> <LI> Evolution of the Lagrangian velocity distribution is governed by injection modes. </LI> <LI> Spatial velocity Markov model for variable injection modes. </LI> <LI> Equivalence between spatial Markov model and Boltzmann equation. </LI> </UL> </P>
COSMOS2015 photometric redshifts probe the impact of filaments on galaxy properties
Laigle, C,Pichon, C,Arnouts, S,McCracken, H J,Dubois, Y,Devriendt, J,Slyz, A,Le Borgne, D,Benoit-Lé,vy, A,Hwang, Ho Seong,Ilbert, O,Kraljic, K,Malavasi, N,Park, Changbom,Vibert, D Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.474 No.4
<P>The variation of galaxy stellar masses and colour types with the distance to projected cosmic filaments are quantified using the precise photometric redshifts of the COSMOS2015 catalogue extracted from Cosmological Evolution Survey (COSMOS) field (2 deg(2)). Realistic mock catalogues are also extracted from the lightcone of the cosmological hydrodynamical simulation HORIZON-AGN. They show that the photometric redshift accuracy of the observed catalogue (sigma(z) < 0.015 at M-* > 10(10)M(circle dot) and z < 0.9) is sufficient to provide two-dimensional (2D) filaments that closely match their projected three-dimensional (3D) counterparts. Transverse stellar mass gradients are measured in projected slices of thickness 75 Mpc between 0.5 < z < 0.9, showing that the most massive galaxies are statistically closer to their neighbouring filament. At fixed stellar mass, passive galaxies are also found closer to their filament, while active star-forming galaxies statistically lie further away. The contributions of nodes and local density are removed from these gradients to highlight the specific role played by the geometry of the filaments. We find that the measured signal does persist after this removal, clearly demonstrating that proximity to a filament is not equivalent to proximity to an overdensity. These findings are in agreement with gradients measured in both 2D and 3D in the HORIZON-AGN simulation and those observed in the spectroscopic surveys VIPERS and GAMA (which both rely on the identification of 3D filaments). They are consistent with a picture in which the influence of the geometry of the large-scale environment drives anisotropic tides that impact the assembly history of galaxies, and hence their observed properties.</P>
Galaxy evolution in the metric of the cosmic web
Kraljic, K.,Arnouts, S.,Pichon, C.,Laigle, C.,de la Torre, S.,Vibert, D.,Cadiou, C.,Dubois, Y.,Treyer, M.,Schimd, C.,Codis, S.,de Lapparent, V.,Devriendt, J.,Hwang, H. S.,Le Borgne, D.,Malavasi, N.,Mi Oxford University Press 2018 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.474 No.1