A5041526119- High-pressure geophysics and materials
- Clay minerals and soil interactions
- Glass properties and applications
- Process Optimization and Integration
- Geomagnetism and Paleomagnetism Studies
- Zeolite Catalysis and Synthesis
- Fault Detection and Control Systems
- Neural Networks and Applications
- Geological and Geochemical Analysis
- Energetic Materials and Combustion
- Algal biology and biofuel production
- Advanced Control Systems Optimization
- Metallurgical Processes and Thermodynamics
- Photosynthetic Processes and Mechanisms
- Boron and Carbon Nanomaterials Research
- Sugarcane Cultivation and Processing
- Geochemistry and Geologic Mapping
- Air Quality and Health Impacts
- Diamond and Carbon-based Materials Research
- Heavy metals in environment
- Geophysical and Geoelectrical Methods
- Catalysis and Oxidation Reactions
- DNA and Nucleic Acid Chemistry
- Geology and Paleoclimatology Research
- Genomics and Chromatin Dynamics
CEA Le Ripault
2008-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2008-2025
Université Paris Cité
2010-2024
Institut de physique du globe de Paris
2009-2024
Centre National de la Recherche Scientifique
2009-2024
Institut Charles Gerhardt Montpellier
2009
École Nationale Supérieure de Chimie de Montpellier
2009
Université de Montpellier
2009
École Centrale Paris
1979-2008
A dense amorphous form of silica was prepared at high pressure from the highly compressible, siliceous zeolite, silicalite-1-F. Reverse Monte Carlo modeling total X-ray scattering data shows that structure this novel SiO2 recovered under ambient conditions is distinct vitreous and retains basic framework topology (i.e., chemical bonds) starting crystalline zeolite. This material is, however, over different length scales probed by Raman due to strong geometrical distortions. thus an example...
For several decades now, air pollution has been a key concern for experts, public authorities and city dwellers, who are the first to be affected. Airborne particulate matter (PM) is indeed well known cause adverse health effects. However, urban quality stations too sparse provide detailed picture of distribution pollution. Since PM also deposited on surfaces tree, tree bark can then act as an alternative passive trap. Its magnetic properties make it possible measure amount metal particles...
We investigated the rock magnetic and geochemical properties of a collection pumice samples gathered from shores Japan France. These pumices exhibit vitreous matrix with foam-like texture, resulting in low density that allows them to float drift far their point origin distant coastlines.A range analytical techniques was employed, including major trace element analyses, SEM FEG-SEM imaging, EDS-X experiments such as thermomagnetic hysteresis loops, coercivity measurements, FORC diagrams. The...
SUMMARY The chronic exposure to particulate matter (PM) pollution causes societal and environmental issues, in particular urban areas where most citizen are regularly exposed vehicular traffic. Since almost two decades, magnetic monitoring has demonstrated its efficiency successfully map relative concentrations of airborne particle deposition on accumulative surfaces. A better understanding the results requires discriminating main traffic-related sources observed signal collectors. To meet...
In situ X-ray diffraction and Raman spectroscopy measurements of synthetic powdered samples faujasite 13X were carried out at high pressure using diamond anvil cells. Structural changes are detected, linked to a progressive reduction in crystallinity, before complete amorphization the material. Three distinct compressibility regions clearly observed, delimited by two discontinuities dependence volume around 2 3.5 GPa. The transition from crystal amorphous state is incomplete partially...
Confined H2O molecules act as local probes for depressurization phenomena during the pressure induced amorphisation of faujasite NaX at which OH stretching frequency first decreases and then increases almost to its room value upon further compression. Pair distribution function (PDF) analysis provides evidence that corresponds a collapse structure around hydrated sodium cations with strong distortion secondary building units (double six-membered rings, sodalite cages). Both use guest in far-...
This paper presents a nonlinear predictive control (NMPC) strategy applied to the continuous microalgae cultivation process in closed photobioreactor. The photo-bioreactor system is programmed operate constant biomass density mode, order maintain culture at optimal population and sustain high production levels. objective achieved by regulating while tracking reference medium feeding profile determined off-line. proposed NMPC approach validated simulation, performances benefits for cell...
Abstract The topology of amorphous materials can be affected by mechanical forces during compression or milling, which induce material densification. Here, we show that densified silica (SiO 2 ) fabricated cold siliceous zeolite (SZ) is permanently densified, unlike glassy SiO (GS) although the X-ray diffraction data and density former are identical to those latter. Moreover, from SZ retains crystalline SZ, whereas GS relaxes pristine after thermal annealing. These results indicate it...
This paper addresses a study of the regulation biomass density in closed microalgal photobioreactor by using linearizing control approach. The system was programmed to operate constant mode, order maintain culture at optimal population and sustaining high production levels. designed law uses an input-output inner loop, proportional integral Derivative (P.I.D.) regulator has been added cancel steady errors. In addition, this PID-regulator is supplied with anti-windup compensator. Thus,...
Abstract The crystallization of nanolites within magma chambers has recently raised a strong interest due to their impact on increasing melt viscosity and triggering magmatic eruptions. In 2021, the Fukutoku‐Oka‐no‐Ba (FOB) underwater eruption produced large quantities pumices that eventually formed rafts drifting at surface ocean East coasts Japan. Pumices collected along shore shortly after grounding show various colors, microscopic Raman analyses made by Yoshida et al. ( Island Arc , 31...
Abstract Airborne particulate matter (PM) is known to have adverse health effects and a growing concern in urban areas. Spatial temporal variability difficult assess with the few air quality stations typically available cities. As an alternative, tree bark acts as passive captor on which PM deposited. Magnetic susceptibility measurements can be used proxy indicator estimate pollution from vehicle sources. We present citizen science project called Ecorc’Air, volunteers collect plane samples,...
In addition to pressure and temperature effects, shear strain has been proposed play an important role in the initiation decomposition mechanisms of energetic materials. To study effect more detail, a diamond anvil cell developed. this paper, we present Raman spectroscopy effects on high-pressure behaviour nitromethane (NM). Two major are observed our experiments. The first one is lowering pressures at which different structural modifications NM occur. second 28 GPa, where sample decomposes...
The effect of shear strain on the high‐pressure behavior nitromethane has been studied by Raman spectroscopy in a diamond anvil cell (SDAC). Two major effects have observed. first one is lowering pressures at which different spectral transformations occur. second observed 28 GPa. At this pressure, sudden decomposition sample occurs due to deformation. Observation after shows presence black residue, mainly composed carbon soot.