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Papers by Domingos De Sousa Meneses

International Journal of Applied Glass Science

HAL (Le Centre pour la Communication Scientifique Directe), Mar 9, 2014

Experimental Astronomy, Dec 1, 2022

The primary scientific goal of ICARUS (Investigation of Coronal AcceleRation and heating of solar... more The primary scientific goal of ICARUS (Investigation of Coronal AcceleRation and heating of solar wind Up to the Sun), a mother-daughter satellite mission, proposed in response to the ESA "Voyage 2050" Call, will be to determine how the magnetic field and plasma dynamics in the outer solar atmosphere give rise to the corona, the solar wind, and the entire heliosphere. Reaching this goal will be a Rosetta Stone step, with results that are broadly applicable within the fields of space plasma physics and astrophysics. Within ESA's Cosmic Vision roadmap, these science goals address Theme 2: "How does the Solar System work?" by investigating basic processes occurring "From the Sun to the edge of the Solar System". ICARUS will not only advance our understanding of the plasma environment around our Sun, but also of the numerous magnetically active stars with hot plasma coronae. ICARUS I will perform the first direct in situ measurements of electromagnetic fields, particle acceleration, wave activity, energy distribution, and flows directly in the regions in which the solar wind emerges from the coronal plasma. ICARUS I will have a perihelion altitude of 1 solar radius and will cross the region where the major energy deposition occurs. The polar orbit of ICARUS I will enable crossing the regions where both the fast and slow winds are generated. It will probe the local characteristics of the plasma and provide unique information about the physical processes involved in the creation of the solar wind. ICARUS II will observe this region using remote-sensing instruments, providing simultaneous, contextual information about regions crossed by ICARUS I and the solar atmosphere below as observed by solar telescopes. It will thus provide bridges for understanding the magnetic links between the heliosphere and the solar atmosphere. Such information is crucial to our understanding of the plasma physics and electrodynamics of the solar atmosphere. ICARUS II will also play a very important relay role, enabling the radio-link with ICARUS I. It will receive, collect, Grigory Vekstein is deceased.

Editions des archives contemporaines eBooks, Nov 30, 2020

HAL (Le Centre pour la Communication Scientifique Directe), Sep 28, 2020

HAL (Le Centre pour la Communication Scientifique Directe), Apr 13, 2017

Absorption and scattering properties of pyrolytic boron nitride (pBN) have been characterized by ... more Absorption and scattering properties of pyrolytic boron nitride (pBN) have been characterized by infrared spectroscopy. The strong dielectric anisotropy predicted by first principles calculations is confirmed by measurements performed on a highly oriented pBN sample. Optical properties of textured samples elaborated by chemical vapor deposition were identified from normal hemispherical reflectance and transmittance spectra by applying modified two flux and four flux transport models. It is also shown that coating carbon-carbon composites used to build solar shields with a pBN layer having an optimal thickness could improve the protection performance.

HAL (Le Centre pour la Communication Scientifique Directe), Dec 2, 2019

Affiche présentée par D BlochNational audienc

HAL (Le Centre pour la Communication Scientifique Directe), Nov 7, 2012

HAL (Le Centre pour la Communication Scientifique Directe), Nov 25, 2019

Corrosion Science, Aug 1, 2021

The oxidation resistance of receivers is a critical point in the development of plants using sola... more The oxidation resistance of receivers is a critical point in the development of plants using solar tower technology. lntem1etallics in Mo-Si-A-1 system present oxidation maxinlum temperature and creep resistance superior to the ones of the currently used Ni-based alloys. We followed here the oxidation resistance of such intem1etallic exposed to different rreannents in air: Jong-term oxidation (up to 700 h) at 1373 K, and for several cycles of 20 min in solar fumace. The nom1al spectral emissiviry is measured up to 1640 K in air, and our main positive conclusion is this properry is not degraded by the oxidation.

HAL (Le Centre pour la Communication Scientifique Directe), Sep 22, 2013

HAL (Le Centre pour la Communication Scientifique Directe), Nov 19, 2013

Ce travail s'inscrit dans le cadre d'une recherche alternative à l'étuvage qui vise à chauffer

HAL (Le Centre pour la Communication Scientifique Directe), Nov 14, 2022

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Results in Physics, 2017

This paper aims to study the mechanical behaviour and surface chemistry in relationship with mois... more This paper aims to study the mechanical behaviour and surface chemistry in relationship with moisture content of Iroko (Milicia excelsa), Bilinga (Nauclea diderrichii), and Tali (Erythrophleum suaveolens). Mechanical characterization was done experimentally using tensile and bending tests. Chemical semi quantitative analysis of the wood at 10%, 15%, 20% and 30% of moisture content was investigated using attenuated total reflectance Fourier transform infrared spectroscopy. The main chemical functions involved by the presence of water were identified as well as the other functional groups. The ratio between lignin and carbohydrates was estimated for all the wood species. The results indicated a negative correlation in the relation between moisture content and mechanical properties. Tali had the higher bending strength while Iroko had the lowest value. The average percentage change rate of the Young's moduli induced by 1% of moisture content changes, especially between 10% and 20%, varied with the wood species: 1.69 % in Tali, 1.65% in Bilinga and 2.54% in Iroko approximately. The infrared spectra obtained differed among species. The results also showed that Iroko contained higher lignin and were the least sustainable according to mechanical properties. The bands at 3340 cm-1 and 1635cm-1 were more impacted by moisture content.

Far- and mid-infrared emission and reflection spectra of ferrielectric hexagonal TmMnO3 show that... more Far- and mid-infrared emission and reflection spectra of ferrielectric hexagonal TmMnO3 show that small polarons, a paramagnetic collective electronic mode, and lower than TN soft hybrid modes are in concomitant relation. CO2 laser heating in dry air triggers oxidation and Mn3+- Mn4+ double exchange hopping conductivity. A collective excitation in the paramagnetic phase is assigned to eg electrons in THz low energy d-orbital fluctuations. It locks-in at the E-type antiferromagnetic onset (TN ∼ 80K) into soft bands that harden simultaneously down to 4 K with temperature dependence given by the magnetic long range order coupling of the collective electric dipole. They have TN as critical temperature and critical exponents suggesting a second order phase transition. They also match zone center spin wave modes measured in isomorphous LuMnO3 (Lewtas et al, Phys. Rev. B~\textbf{82}, 184420 (2010)). Both excitations, magnons y electric dipoles, are generated by electrons eg in deformed d-o...

We report on reflectivity and emission far infrared spectra of NdMnO 3 between4K and its dissocia... more We report on reflectivity and emission far infrared spectra of NdMnO 3 between4K and its dissociation temperature. Phonon bands at 300K are in agreement with orthorhombic Pbnm space group assignments. In addition, a broad strong band. reminiscent to a phase-mode in quasi-one dimension metals, is found at very low frequencies that it is understood originating in charge fluctuations in d-orbitals. There is no distinctive behaviors between 1073 K and 1173 K, where orthorhombic O and O' coexist. Beyond ∼700 K a mid-infrared polaron band turns into a Drude tail suggesting hopping conductivity double exchange due to air heating oxidation Mn 3+ → Mn 4+ +1e −. Below 300 K phonons are better defined and the low frequency giant dipole acquires strength. Few degrees above the antiferromagnetic transition it broadens as electrons loosing coherence. At T N ∼76 K we find strong phonon magnetostriction while the band turns asymmetric locking-in to the underlying magnetic order. Preliminary measurements of hexagonal TmMnO 3 , show that asymmetry split due to lower symmetry and the triangular magnetic lattice two exchange integrals J 1 and J 2 in the a-b plane. Similar to a soft mode those two bands and a lower frequency resonance undergo strong hardening down to 4 K.

conférence présentée par D BlochInternational audienc

poster présenté par I Maurin (et A Laliotis)International audienc