[en] A heating experiment named TER is being conducted with the objectives to identify the thermal properties, as well as to enhance the knowledge on THM processes in the Callovo-Oxfordian clay at the Meuse/Haute Marne Underground Research Laboratory (France). The in situ experiment has being switched on from early 2006. The heater, 3 m length, is designed to inject the power in the undisturbed zone at 6 m from the gallery wall. A heater packer is inflated in a metallic tubing. During the experiment, numerous sensors are emplaced in the surrounding rock and are experienced to monitor the evolution in temperature, pore-water pressure and deformation. The models and numerical codes applied should be validated by comparing the modeling results with the measurements. In parallel, some lab testing have been achieved in order to compare the results given with two different scales (cm up to meter scale). In this paper, we present a general description of the TER experiment with installation of the heater equipment and the surrounding instrumentation. Details of the in situ measurements of temperature, pore-pressure and strain evolutions are given for the several heating and cooling phases. The thermal conductivity and some predominant parameters in THM processes (as linear thermal expansion coefficient and permeability) will be discussed. (authors)

[en] Highlights: • The heterostructure coating was synthesized by a facile route with a low cost. • The heterojunction enhanced the photoconversion efficiency of g-C₃N₄ by 21.11%. • MnO₂ oxidized GSH, thus assisting the enhancement of disinfection effect. • MnO₂/g-C₃N₄ presented antibacterial efficacy over 99.2% within a short time. -- Abstract: Herein, a heterostructure based on MnO₂ and g-C₃N₄ was constructed on the surface of metallic Ti implants, in which MnO₂ favored the transfer and separation of free charges to enhance the photoconversion efficiency of g-C₃N₄ by 21.11%. Consequently, the yield of ROS was promoted significantly, which denatured protein and damaged DNA to kill bacteria efficiently. In addition, glutathione (GSH, l-γ-glutamyl-l-cysteinyl-glycine) defending oxidative stress in bacteria, was oxidized by MnO₂ in the hybrid coating once the bacterial membrane was disrupted by ROS. Hence, after visible light irradiation for 20 min, MnO₂/g-C₃N₄ coating exhibited superior disinfection efficacy of 99.96% and 99.26% against S. aureus and E. coli severally. This work provided a practical sterilization strategy about MnO₂/g-C₃N₄ systems through the synergistic effects of enhanced photodynamic antibacterial therapy and oxidization effect of MnO₂ with great biosafety, in which MnO₂ enhanced the photocatalyst property of g-C₃N₄ to generate more ROS and deplete GSH to improve antibacterial efficiency. It will bring more insight into rapid and highly effective disinfection and antibacterial strategy without using traditional high-temperature, ultraviolet ray and antibiotics that cause side-effects.

[en] Highlights: • A novel ternary Au nanoparticles and carbon quantum dots loaded TiO₂ nanotube array system. • Near-infrared light photocatalysis due to the upconversion of carbon quantum dots and catalysis of Au nanoparticles. • TiO₂ nanotubes/Au/ carbon quantum dots can kill bacteria with 96.19 % (Staphylococcus aureus) and 99.89 % (Escherichia coli) antibacterial efficiency within 15 min. -- Abstract: The excellent photocatalysis is quite important for coating materials on implants, which can be photoinspired to kill bacteria by locally producing the reactive oxygen species (ROS) within a very short time. Herein, we developed a novel photocatalytic system of Au nanoparticles and carbon quantum dots loaded TiO₂ nanotube array (TNTs/Au/CDs) on the surface of titanium. This system can exhibit enhanced near-infrared (NIR) light photocatalysis and photothermy because CDs can convert NIR light into the light of 500–600 nm and transfer electrons, which can inspire nano Au-catalyzed TNTs to generate ROS and enhance the surface plasmon resonance (SPR) effect of Au nanoparticles to produce more local photothermy. The enhanced photocatalysis and local photothermy can exhibit a synergistic effect to kill the bacteria highly effectively within a very short time by damaging the membranes of the bacteria. The antibacterial efficiency of the modified surface is 96.19% and 99.89% against Staphylococcus aureus and Escherichia coli, respectively, under 808 nm NIR light irradiation for 15 min.

[en] Highlights: • The calculated phonon frequencies and elastic coefficient indicated MgSnO₃ under compressive strain could meet stability. • The calculated band gap of R3c-MgSnO₃ under compressive strain by MBJ functional is agreement with the recent experiment. • The compressive strain can effectively regulate the stability, ferroelectricity and photoelectric properties of MgSnO₃. The stability, ferroelectricity, and electronic structure of R3c-MgSnO₃ and R3c-MgSnO₃ under compressive strain were investigated by density functional theory. The calculated phonon frequencies and elastic coefficient indicated that MgSnO₃ and MgSnO₃ under compressive strain could meet dynamic and mechanical stability. The phonon frequencies, elastic coefficient, and mechanical property have been increased in MgSnO₃ under compressive strain, which is explained by the bond length, Bader charge, and electronic structure. The bandgap of R3c-MgSnO₃ under compressive strain has been increased to 3.8 eV with an indirect bandgap to enhance optical transparency, which agrees with the experiment. The ferroelectric stability and polarization strength could also be promoted by the compressive strain in MgSnO₃. The stability, ferroelectric, mechanical, and photoelectric properties of R3c-MgSnO₃ could be controlled by compressive strain.

[en] To buffer the unavoidable volume expansion and structure collapse problems of transitional metal sulfides during lithiation process, herein, nanosized α-MnS homogenously embedded in axial multichannel carbon nanofibers was well designed and directly used as freestanding anodes for lithium-ion batteries (LIBs). The obtained carbon nanofibers were interwoven into a flexible and cross-linked film, which offered a 3D successive conductive networks and guaranteed sufficient contact interface for electrode/electrolyte. The nanosized α-MnS was homogenously embedded into the carbon nanofiber framework and surrounded with a thin protective carbon layer, which effectively maintained the structural integrity for a satisfied cycling performance. The high aspect ratio carbon nanofibers with axial open channels supplied sufficient active sites and formed long-range electronic pathways along the axial carbon wall. Meanwhile, the radial voids provided enormous accommodation space to alleviate volume expansion and shortened diffusion paths for faster ionic transfer. Benefitting from the above unique merits, the freestanding electrodes delivered excellent lithium storage performances and remarkable long-term cycling stability, including a high initial reversible capacity of 772 mAh g⁻¹ and excellent cycling capacity retention of 93.4% after 100 cycles at a current density of 0.5 A g⁻¹.

[en] Rare-earth-based high-entropy alloys (HEAs) with large magnetocaloric effect (MCE) have been recently recognized as good candidates for magnetic refrigeration. Herein, the complex magnetic transition, MCE, refrigerant capacity (RC), and magnetic-phase diagram of single-phase TbDyHoEr HEA are studied. It is showed in the results that due to complex magnetic transition and an ideal table-like MCE, the RC of TbDyHoEr is significantly improved from 883.19 to 1049.22 J kg${}^{-<!--\; ???\; -->1}$ by melt-spun treatment. In terms of RC value and hysteresis performance, the melt-spun treatment significantly improves the application potential of TbDyHoEr HEA as a high-efficient magnetic refrigeration material, and the ideal table-like MCE in a large temperature range enables this material to meet the requirements of both cryogenic refrigeration and mesothermal refrigeration for an Ericsson cycle. (© 2023 Wiley‐VCH GmbH)

[en] This document gathers Power Point presentations proposed during plenary sessions and workshops. Plenary sessions addressed the relationship between hydrocarbons and new energy balances, the attractiveness of oil industry for students, operators operating in France, perspectives for the refining activity in Europe, the evolution of French system for research and innovation. The workshop topics have been: Gas, renewable and nuclear as the winning trio for 2050, Geomechanics for a better production, Economic intelligence, Ships for offshore service, Safety in the oil industry, Peak oil or peak demand, A know-how at the service of sea energies, Education in oil producing countries, Water treatment in hydrocarbon industries, Re-development of mature fields, Standards as an unavoidable tool for the international development, Future underwater fields, Technological challenges, environmental impact and safety for deep sea and ground-based drillings, Refining development and project financing