Nouvelle approche géologique et géodinamique du Complexe Hydrothermal de Moulay Yacoub, bordure septentrionale du Sillon Sud Rifain

As águas termais de Moulay Yacoub surgem em formações miocénicas do Sulco Sul do Rife. São caracterizadas por forte mineralização, relacionada com a natureza do seu local de armazenamento e circulação em reservatórios de litologias variadas. Apresentam duas fácies químicas principais: uma Cl-Na, pouco diluída, e outra, Cl-Ca-Mg, dominada por águas imaturas. A comparção geoquímica e geotermométrica com outras fontes regionais sugere uma origem mais profunda que o reservatório liássico. A recente descoberta de extrusões de blocos de calcário liássico, de magmatitos paleozóicos, de metassedimentos e de grandes massas de doleritos triássicos, sugere a existência de formações permeáveis sob a cobertura margosa do Miocénico. Os acidentes profundos NE-SW, associados a um cavalgamento cego, sugerem uma relação estreita entre estas águas termais e as extrusões do soco ante-neogénicos. Durante a sua passagem para a superfície, as águas termais de Moulay Yacoub terão sido diluídas através de misturas ocorridas principalmente no reservatório liássico

Cohort Profile: Burden of Obstructive Lung Disease (BOLD) study

The Burden of Obstructive Lung Disease (BOLD) study was established to assess the prevalence of chronic airflow obstruction, a key characteristic of chronic obstructive pulmonary disease, and its risk factors in adults (≥40 years) from general populations across the world. The baseline study was conducted between 2003 and 2016, in 41 sites across Africa, Asia, Europe, North America, the Caribbean and Oceania, and collected high-quality pre- and post-bronchodilator spirometry from 28 828 participants. The follow-up study was conducted between 2019 and 2021, in 18 sites across Africa, Asia, Europe and the Caribbean. At baseline, there were in these sites 12 502 participants with high-quality spirometry. A total of 6452 were followed up, with 5936 completing the study core questionnaire. Of these, 4044 also provided high-quality pre- and post-bronchodilator spirometry. On both occasions, the core questionnaire covered information on respiratory symptoms, doctor diagnoses, health care use, medication use and ealth status, as well as potential risk factors. Information on occupation, environmental exposures and diet was also collected

Spectroscopic and spin-orbit calculations on the SO+ radical cation

International audienceHighly correlated ab initio methods were used in order to generate the potential-energy curves of the SO+ electronic states correlating to S+(S-4(u))+O(P-3(g)) and S+(D-2(u))+O(P-3(g)). These curves were used for deducing accurate spectroscopic properties for these electronic states. Our calculations predict the existence of a (2)Phi state lying close in energy to the well-characterized b (4)Sigma(-) state and several weakly bound quartet and doublet states located in the 6-9 eV internal energy range not identified yet. The spin-orbit integrals between these electronic states were evaluated using these highly correlated wave functions, allowing the discussion of the metastability and the predissociation processes forming S++O in their electronic ground states. Multistep spin-orbit-induced predissociation pathways are suggested. More specifically, the experimentally determined dissociative potential-energy curve [H. Bissantz , Z. Phys. D 22, 727 (1992)] proposed to explain the rapid SO+(b (4)Sigma(-),v >= 13)-> S+(S-4(u))+O(P-3(g)) reaction is found to coincide with the 2 (4)Pi potential-energy curve for short internuclear distances and with the repulsive 1 (6)Pi state for longer internuclear separations. (c) 2006 American Institute of Physics

Shifts of one-electron ions lines from Δn = 0 interactions with electrons in hot and dense plasma

This paper is concerned with lineshifts of hydrogen-like ions due to electron collisions in dense and hot plasmas. These collisions are treated by including all effects due to monopole, dipole, and quadrupole interactions between radiator and electron perturbers. The latter follow exact hyperbolic trajectories with a possible penetrating part inside atomic orbits. A simple closed form for the line shift has been derived. Comparison between our semi-classical results and the quantum mechanical ones shows good agreement for a large range of high electron densities and temperatures

Cross section and rate coefficient calculations for electron impact excitation, ionisation and dissociation of the X 1Σg+^{\mathsf{{1}}}{\mathsf{\Sigma_{g}^{+}}}, c 3Πu^{{\mathsf{3}}}{\mathsf\Pi_\mathsf{u}}, a 3Σg+^{\mathsf{3}}{\mathsf\Sigma} _{\mathsf{g}}^{+}, e 3Σu ⁣ ⁣+^{\mathsf{3}}{\mathsf{\Sigma_{u}}^{\!\!+}} and B′^\prime 1Σu ⁣ ⁣+^{\mathsf{1}}{\mathsf{\Sigma_{u}}}^{\!\!+} states of H2_{\mathsf{2}}

The weighted total cross section (WTCS) theory has been applied to the electron-H$_{2}$ collision to obtain excitation, ionisation and dissociation cross section and rate coefficients of the X $^{1}\!\Sigma _{g}^{+}$, c $^{3}\!\Pi _{u}$, a $^{3}\!\Sigma _{g}^{+}$, e $^{3}\!\Sigma _{u}^{+}$ and B$^\prime$ $^{1}\!\Sigma _{u}^{+}$ states. Calculation has been performed in the temperature range 1500 K–15000 K. Rate coefficients are calculated from WTCS assuming Maxwellian energy distribution functions for electrons and heavy particles. Thermal equilibrium results are presented and fitting parameters (a, b and c) are given for each reaction rate coefficient: $k(\theta ) = a (\theta ^{b})$exp($-c/\theta )$

Theoretical investigation of the SO2+ dication and the photo-double ionization spectrum of SO

International audienceHighly correlated ab initio methods were used in order to generate the potential energy curves of the electronic states of the SO2+ dication and of the electronic ground state of the neutral SO molecule. These curves were used to predict the spectroscopic properties of this dication and to perform forward calculations of the double photoionization spectrum of SO. In light of spin-orbit calculations, the metastability of this doubly charged ion is discussed: for instance, the rovibrational levels of the X (1)Sigma(+) and A (3)Sigma(+) states are found to present relatively long lifetimes. In contrast, the other electronic excited states should predissociate to form S+ and O+ in their electronic ground states. The simulated spectrum shows structures due to transitions between the v=0 vibrational level of SO (X (3)Sigma(-)) and the vibrational levels below the barrier maximum of 11 of the calculated electronic states. The 2 (1)Sigma(+) electronic state of SO2+ received further treatment: in addition to vibrational bands due to the below barrier energy levels of this electronic state, at least nine continuum resonances were predicted which are responsible for the special shape of the spectrum in this energy region. This work is predictive in nature and should stimulate future experimental investigations dealing with this dication. (C) 2005 American Institute of Physics

Electronic structure and spectroscopy of the MgO2 + cation

Highly correlated ab initio methods are used to investigate the lowest MgO2 + electronic states. Our computations confirm the existence of the strongly bent (MgO2 + over(X, ∼)2 A2) form and the weakly bound l - MgOO+ (over(X, ∼)4 Σ-) charge quadrupole complex. For both isomers, the three-dimensional potential energy surfaces (3D-PESs) of their electronic ground states are mapped in internal coordinates not far from their respective equilibrium geometries. Then a set of spectroscopic parameters is derived using second order perturbation theory. The rovibrational spectra are also deduced variationally. One-dimensional cuts of the 3D-PESs of the lowest doublet and quartet electronic states of MgO2 + along the RMgO and ROO stretchings and bending are calculated, covering both the molecular and the asymptotic regions. These curves are used later for discussing the metastability of this cation and to propose a plausible mechanism for the Mg+ + O2 atmospheric ion-molecule reaction. © 2008 Elsevier B.V. All rights reserved.M.H. would like to thank a visiting fellowship at CSIC (Spain) during the preparation of this work. The Project A/8083/07 CSICUniversity of Tunis El Manar (AECI-MAE, Spain) and the Project AYA2005-00702 (MEC, Spain) are acknowledged for financial supports.Peer Reviewe

Electronic structure and spectroscopy of the MgO2+ cation

International audienc

Cross-section and rate coefficient calculation for electron impact excitation, ionisation and dissociation of H

The weighted total cross-section (WTCS) theory is used to calculate electron impact excitation, ionisation and dissociation cross-sections and rate coefficients of OH, H2, OH+, H2+, OH- and H2- diatomic molecules in the temperature range 1500–15000 K. Calculations are performed for H2(X, B, C), OH(X, A, B), H2+(X), OH+(X, a, A, b, c), H2-(X) and OH-(X) electronic states for which Dunham coefficients are available. Rate coefficients are calculated from WTCS assuming Maxwellian energy distribution functions for electrons and heavy particles. One and two temperature (θe and θg respectively for electron and heavy particles kinetic temperatures) results are presented and fitting parameters (a, b and c) are given for each reaction rate coefficient: k(θ) = a (θb)exp (-c/θ)