Article
Geochemistry & Geophysics
A. Macias, A. Carreon, D. F. Berisford, T. A. Nordheim, G. Kale, D. Goldstein, P. Varghese, L. Trafton, J. Steckloff, K. P. Hand
Summary: The morphology of ice-covered moons in the outer solar system is not well known. Penitentes, blade-like snow features observed on Earth, may provide insight into the morphology of such moons. To investigate this, a Sublimation Monte Carlo (SMC) model was developed to simulate the molecular interactions on an ice-covered surface. The results reveal the importance of molecular redeposition and provide insights into the growth and stability of penitentes on ice-covered worlds.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Review
Geosciences, Multidisciplinary
Romain Dubuis, Giovanni De Cesare
Summary: Fine sediment plays a significant role in river solid flux and can lead to clogging of the riverbed, affecting aquatic habitat and fish reproduction. Numerous studies have explored the impact of clogging on aquatic fauna and examined various parameters involved in the deposition process. This review provides an overview of the physical mechanisms, analyzes different influencing factors, presents models for estimating the depth and quantity of deposition, and discusses research gaps.
EARTH-SCIENCE REVIEWS
(2023)
Article
Automation & Control Systems
Bryan E. Kaiser, Juan A. Saenz, Maike Sonnewald, Daniel Livescu
Summary: The identification of processes that locally and approximately dominate dynamical system behavior has enabled significant advances in understanding and modeling nonlinear differential dynamical systems. We present an objective global measure of the fit of dominant balances to observations and propose a formal definition of the dominant balance identification problem as an optimization problem. Machine learning algorithms can be used for automatic identification of dominant balances.
ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE
(2022)
Article
Chemistry, Analytical
Elena V. Emelyanova, Inna P. Solyanikova
Summary: Results showed that the formation of biosensor response is influenced by reactive oxygen species, enzymatic conversion rate, transport systems, and metabolism. Different microbial cells have different effects on response formation, highlighting the complexity of biosensor mechanisms.
Article
Construction & Building Technology
Vsevolod Mymrin, Daniela E. Pedroso, Cleber L. Pedroso, Monica A. Avanci, Paulo H. B. Rolim, Karina Q. Carvalho, Rodrigo E. Catai
Summary: A new sustainable concrete-like construction composite has been developed by replacing traditional natural raw materials with industrial wastes, meeting Brazilian standards and offering environmentally friendly building materials.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Ahmet Saymbetov, Ramizulla Muminov, Nursultan Japashov, Yorkin Toshmurodov, Madiyar Nurgaliyev, Nursultan Koshkarbay, Nurzhigit Kuttybay, Batyrbek Zholamanov, Zhang Jing
Summary: The paper introduces a method for forming large-sized Si(Li) radiation detectors using double-sided diffusion and drift of lithium-ions into monocrystalline silicon, which can shorten manufacturing time and provide a more uniform distribution of lithium-ions.
Article
Psychology, Multidisciplinary
Miguel Angel Duran-Vinagre, Sergio J. J. Ibanez, Sebastian Feu, Susana Sanchez-Herrera
Summary: This study aimed to analyze university students' motivational processes and intention to be physically active, comparing according to gender and fields of study. The results showed that men had higher levels of self-determined behavior and intention to be physically active in the future. Additionally, there were significant differences between different fields of study.
FRONTIERS IN PSYCHOLOGY
(2023)
Article
Environmental Sciences
Junghee Yun, Kyung-Ja Ha
Summary: This study evaluates the conditions favorable for fog generation in the Yellow Sea and examines the physical processes underlying fog using direct observations and data analysis. The study also classifies the characteristics of air masses associated with fog events and analyzes the turbulent air-sea fluxes related to fog formations. The results provide valuable insights into the fogging processes over the ocean.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Meteorology & Atmospheric Sciences
Na-Yeon Shin, Jong-Seong Kug, F. S. McCormack, Neil J. Holbrook
Summary: Observational analyses have revealed the occurrence of double-peaked (DP) El Nino events since 2000, where two warm centers develop concurrently in the central and eastern Pacific, showing more distinctive anomalous precipitation along the Pacific intertropical convergence zone (ITCZ). These peculiar precipitation anomalies play a critical role in enhancing equatorial westerly wind stress anomalies, aiding in the development of the eastern SSTA peak by deepening the thermocline in the eastern Pacific.
JOURNAL OF CLIMATE
(2021)
Review
Astronomy & Astrophysics
Claude-Andre Faucher-Giguere, S. Peng Oh
Summary: The past decade has witnessed significant theoretical progress in our understanding of the circumgalactic medium (CGM) due to rich observations and advanced simulations. The properties of the CGM are determined by the competition between gravity-driven infall and gas cooling. The interaction between the hot and cold phases of the multiphase gas and the effect of CGM on galaxy evolution remain open questions.
ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS
(2023)
Review
Chemistry, Multidisciplinary
Carl E. Bonner, Mikhail Noginov, Vanessa N. Peters, Thejaswi U. Tumkur
Summary: Metal/dielectric composite materials with alternating layers of metal and magnesium fluoride have been developed, enabling control of the dielectric constant and maintaining the speed and amplitude of propagating waves. These materials find applications in surface wetting, fluorescence quenching, and photochemical reactions.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Plant Sciences
Glenn Philippe, Damien De Bellis, Jocelyn K. C. Rose, Christiane Nawrath
Summary: Cuticles are specialized cell wall structures on the surface of terrestrial plant organs, largely composed of lipidic compounds. They act as barriers to water, solute, and environmental factors. The export mechanisms of cuticle components are still not fully understood, although plasma membrane-localized ATP-binding cassette (ABC) transporters are known to be involved. The existence of multiple export mechanisms and the pathway of cuticle precursors through the polysaccharide wall are discussed in this article.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Geochemistry & Geophysics
Irene Menichelli, Pasquale De Gori, Francesco Pio Lucente, Luigi Improta, Claudio Chiarabba
Summary: Tomographic images of the lithosphere provide crucial information for understanding the evolution of mountain belts and their interaction. By analyzing seismic wave data, we obtained reliable Vp and Vp/Vs models in the critical depth range where plates in the central Mediterranean area interact. These models reveal the continuous underthrusting of the European plate in the Alps and the delamination of the Adria lithosphere after collision. Moreover, the tomograms unveil lateral variations in continental and oceanic subduction along the Alpine belt, as well as evidence of fluids that facilitate the ongoing deformation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
P-M Zanetta, C. Le Guillou, H. Leroux, B. Zanda, R. Hewins, G. Bellino
Summary: This research examines the nature of dust that accumulated onto chondrules in the nebula and investigates the formation conditions of fine-grained rims (FGRs). The study compares three least altered chondrites from different chondrite groups and analyzes their textures, compositions, and grain sizes using high-resolution SEM and TEM techniques. Results show that FGRs are composed of chemically homogeneous amorphous silicate with no porosity, enclosing domains of porous amorphous silicate and other mineral phases. The FGR material underwent thermal modification and compaction during accretion. The study suggests that dust accreted onto chondrules under different conditions, leading to variations in the textural properties of FGRs.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Review
Forestry
Jikai Ma, Huogen Li
Summary: Leaf shape, one of the most prominent features of plant morphology, exhibits considerable variation due to genetic and environmental factors. The development of leaves involves multiple stages and intricate networks of genes and phytohormones, which play pivotal roles in leaf shaping.
Article
Thermodynamics
Gerard L. Vignoles, Denis Rochais, Sylvain Chupin
Summary: This study presents image-based computations of effective thermal conductivities for different radiation/conduction ratios in Triply Periodic Minimal Surfaces structures. The results show that the critical ratio is linearly proportional to the solid/void volume ratio of the media, highlighting the relationship between ETC and density, conduction ratio, and radiation ratio.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Materials Science, Ceramics
A. Baux, S. Jacques, A. Allemand, G. L. Vignoles, P. David, T. Piquero, M-P Stempin, G. Chollon
Summary: This manufacturing route for SiC ceramics involves steps such as 3D printing and polymer impregnation to create porous structures, followed by pyrolysis and CVD for reinforcement. X-ray tomography and scanning electron microscopy analyses were used to examine the multiscale structure of the SiC specimens, which showed improved oxidation resistance due to a pure and dense CVD-SiC coating.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Cyril Levet, Jean Lachaud, Virginie Ducamp, Regis Memes, Jacques Couzi, Julien Mathiaud, Adrien P. Gillard, P. Weisbecker, Gerard L. Vignoles
Summary: The study focused on the ablation behavior of 3D carbon-fibre reinforced carbon composites during atmospheric re-entry, revealing that fibers recede faster than the matrix. Structural characterization of the composite surface was conducted using scanning electron microscopy and digital optical microscopy.
Article
Chemistry, Multidisciplinary
A. Desenfant, G. Laduye, G. L. Vignoles, G. Chollon
Summary: The study investigates the CVD of silicon carbide from vinyltrichlorosilane (VTS), identifying different conditions and reaction regimes affecting deposition rate, composition, and mechanism. It was found that different chemical reaction regimes result in different outcomes under CVD and infiltration conditions.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Thermodynamics
Carole Charles, Cedric Descamps, Gerard L. Vignoles
Summary: This study investigates the permeation of gases in fibrous preforms of C/C composites through experiments and numerical simulations. The findings show correlations between mass transfer coefficients and porosity at different levels, which can be applied in large-scale numerical simulations of gas flow.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Materials Science, Composites
Gerard L. Vignoles, Gaetan Talue, Quentin Badey, Alain Guette, Rene Pailler, Yann Le Petitcorps, Laurence Maille
Summary: This article proposes a quantitative assessment of the dynamics of the chemical supercritical fluid infiltration process. Carbon deposition kinetics were determined through experiments, and a numerical simulation of the process was performed and validated. The results provide insights into the optimization of the manufacturing of ceramic-matrix composites.
JOURNAL OF COMPOSITES SCIENCE
(2022)
Article
Chemistry, Physical
Jean-Marc Leyssale, Guillaume Couegnat, Stephane Jouannigot, Gerard L. Vignoles
Summary: We conducted an experimental and computational study on the elastic behavior of highly anisotropic pyrocarbons and found that the indentation modulus and hardness significantly decrease with increasing crystallite size or heat treatment temperature. Molecular dynamics simulations revealed that the materials undergo out-of-plane deformations under compressive strain, leading to elastic softening. Notably, extended kinks and buckles were observed in the disordered pyrocarbon and graphite, respectively.
Article
Engineering, Environmental
Thomas Da Calva Mouillevois, Clement Riviere, Georges Chollon, Gerard Vignoles, Nathalie Bertrand
Summary: The fluidization behavior of short Hi Nicalon S fibers before CVD coatings was investigated. The hydrodynamic behavior of a powder alone was compared to that of a short fiber/powder mixture. The minimum fluidization velocity of the mixture was affected by pressure, but not by temperature.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Ceramics
G. Bellezza, G. Couegnat, M. Ricchiuto, G. L. Vignoles
Summary: A multi-physics numerical model for self-healing ceramic matrix mini-composites under tensile load is proposed in this study. The model investigates the transport of oxygen and all chemical species involved in the healing process, as well as issues related to fibre degradation and load transfer following fibre breakage.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Francois Rouze l'Alzit, Thierry Cardinal, Gerard L. Vignoles, Elise Bonnet, Manuel Gaudon
Summary: This study used a thermal sensor to investigate the interaction between a laser beam and a 0.5% Mn-doped ZnAl2.2O4 material, focusing on the laser defocusing parameter. The optical properties of the material were found to be dependent on its thermal history. Thin films of the material were obtained using a screen printing process, and laser irradiation was performed with different levels of defocusing. The luminescence properties around the laser tracks allowed for the determination of the material's thermal history at a micrometer scale. The results showed that defocusing the laser led to a decrease in thermal gradients.
Article
Chemistry, Physical
Franck Polewczyk, Paul Lafourcade, Jean-Pierre Da Costa, Gerard Vignoles, Jean-Marc Leyssale
Summary: In this work, a polygranular image-guided atomistic reconstruction method is introduced, allowing the construction of models with fine-tuned coherence lengths and orientation angle. A database of 210 models is presented, covering a range of parameters characteristic of high and medium textured pyrolytic carbons. A machine learning model based on random forest regression accurately predicts the measurable properties of the models from limited microscopic information. Extensive comparison with experimental data shows excellent agreement and improvements over previous modeling studies on high textured pyrocarbons.
Article
Engineering, Environmental
Amine El Mansouri, Alain Guette, Nathalie Bertrand, Gerard L. Vignoles
Summary: SiC powders coated with pyrocarbon have potential for synthesis of ceramic-matrix composites. A study on non-porous and porous alumina powders as substrates has been conducted using low pressure Fluidized-Bed Chemical Vapor Deposition (FB-CVD) with propane as a precursor at 1000 degrees C. Optimized deposition yields up to 100% were achieved, even inside very small pores (7 nm) and on 200-nm diameter SiC powders. The microstructure and texture of the deposits were dependent on pore size due to a texture-induction effect by the substrate surface.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Multidisciplinary
Marina Fradin, Guillaume Couegnat, Francis Rebillat, Kevin Haras, Gerard L. Vignoles
Summary: This paper presents a 1D analytical model to describe the oxidation behavior of carbon/carbon composites used in rocket propulsion. The model is validated through comparison with experimental results. Oxidation experiments are conducted using different matrix fractions of the composites, and the morphologies are characterized using X-ray micro-computerized tomography and a 3D-image correlation technique. Guidelines for designing and optimizing porous C/C composites with respect to oxidation resistance are provided.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Marina Fradin, Gerard L. Vignoles, Charlotte Ville, Guillaume Couegnat, Mathilde Ridard, Francis Rebillat
Summary: The originality of this work lies in the identification of kinetic parameters for a rough laminar pyrocarbon material under three different oxidizing atmospheres. Through thermogravimetric analysis and X-rays micro-tomography characterization, it was found that the material was in a chemical reaction-controlled regime in both its porous volume and external surface. Activation energies of 203.2 kJ.mol(-1), 253.9 kJ.mol(-1), and 302.2 kJ.mol(-1) were determined for O-2, H2O, and CO2.
Article
Materials Science, Ceramics
Gerard L. Vignoles, Cedric Descamps, Carole Charles, Christian Klein
Summary: Introducing thermal gradients is a key strategy to improve the Chemical Vapor Infiltration (CVI) process and overcome its principal drawback. This paper reviews four application examples and discusses the influence of thermal gradients and processing parameters on the quality of the process and resulting material.
