Polarimetric Control of Reflective Metasurfaces

This letter addresses the synthesis of reflective cells approaching a given desired Floquet's scattering matrix. This work is motivated by the need to obtain much finer control of reflective metasurfaces by controlling not only their co-polarized reflection but also their cross-coupling behavior. The demonstrated capability will enable more powerful design approaches -involving all field components in phase and magnitude- and consequently better performance in applications involving reflective metasurfaces. We first expose some fundamental theoretical constraints on the cell scattering parameters. Then, a successful procedure for controlling all four scattering parameters by applying parallelogram and trapezoid transformations to square patches is presented, considering both normal and oblique incidence

Orientations récentes de l'Université catholique

I. Les paradoxes de l'Université catholique.II. Le passé met en relief les mutations actuelles.1) Un regard sur le passé;2) Les mutations actuelles.III. Les Universités catholiques définissent leur identité:1) L'idéal de l'Université catholique;2) Traits caractéristiques de l'Université catholique;3) Rapports de l'Université catholique avec les autorités de l'Eglise.IV. Conclusions et perspectives d'avenir

Determination of bubble point pressure of two live oils with injected nitrogen by quartz crystal resonator

ACLInternational audienceAn experimental investigation of bubble pressure determination of two live oils with injected nitrogen is presented in this work. Conventional bubble point measurement is done with the aid of a constant expansion test. In such method the bubble point is characterized by an inflection in the PV curve as the oil becomes saturated. For some oils the PV curve is smoothed and it becomes difficult or impossible to accurately determine the bubble point. This work demonstrates that in such cases, the use of quartz crystal resonator technique makes it possible. This technique is successfully applied to determine the bubble point pressure of two live oils in which nitrogen is injected up to 40 mol%

COVID-19 symptoms at hospital admission vary with age and sex: results from the ISARIC prospective multinational observational study

Background: The ISARIC prospective multinational observational study is the largest cohort of hospitalized patients with COVID-19. We present relationships of age, sex, and nationality to presenting symptoms. Methods: International, prospective observational study of 60 109 hospitalized symptomatic patients with laboratory-confirmed COVID-19 recruited from 43 countries between 30 January and 3 August 2020. Logistic regression was performed to evaluate relationships of age and sex to published COVID-19 case definitions and the most commonly reported symptoms. Results: ‘Typical’ symptoms of fever (69%), cough (68%) and shortness of breath (66%) were the most commonly reported. 92% of patients experienced at least one of these. Prevalence of typical symptoms was greatest in 30- to 60-year-olds (respectively 80, 79, 69%; at least one 95%). They were reported less frequently in children (≤ 18 years: 69, 48, 23; 85%), older adults (≥ 70 years: 61, 62, 65; 90%), and women (66, 66, 64; 90%; vs. men 71, 70, 67; 93%, each P < 0.001). The most common atypical presentations under 60 years of age were nausea and vomiting and abdominal pain, and over 60 years was confusion. Regression models showed significant differences in symptoms with sex, age and country. Interpretation: This international collaboration has allowed us to report reliable symptom data from the largest cohort of patients admitted to hospital with COVID-19. Adults over 60 and children admitted to hospital with COVID-19 are less likely to present with typical symptoms. Nausea and vomiting are common atypical presentations under 30 years. Confusion is a frequent atypical presentation of COVID-19 in adults over 60 years. Women are less likely to experience typical symptoms than men

La religion des étudiants américains

Carrier Hervé. La religion des étudiants américains. In: Archives de sociologie des religions, n°12, 1961. pp. 89-106

Le Conseil pontifical pour la culture. Réflexions socio- théologiques

The Pontifical Council for Culture was created by John Paul II in May 1982, as an original department of the Holy See to promote the dialogue between the Church and cultures, to facilitate the cooperation of the Local Churches and ail Catholic organizations working in the field of culture. It will follow in a spécial manner the activities of Unesco and similar bodies, and also the cultural programs of governments (there are more thon 100 Ministries of Culture in the world). The new Council will operate mainly through dialogue, research and volontary coopération. Culture, as understood in Gaudium et Spes, n. 53, has become a new horizon for the activities of the Church.Carrier Hervé. Le Conseil pontifical pour la culture. Réflexions socio- théologiques. In: Revue théologique de Louvain, 14ᵉ année, fasc. 2, 1983. pp. 197-208

Trace elements transfer from gas to water: Study of Ar-Hg°-H2O system in the pressure range 1-20 MPa for temperatures up to 473 K

ACTInternational audienc

Etude du transfert d'un composé trace dans un gaz de stockage vers un aquifère. Mesures et Modélisation. Cas du mercure.

Depuis près de 55 ans, TIGF exploite, dans le sud-ouest de la France deux stockages de gaz naturel en aquifère. Le gaz stocké est essentiellement composé de méthane (CH4 à plus de 90 %), mais il contient également d autres hydrocarbures légers (< C4H10), du diazote (N2), du dioxyde de carbone (CO2), de produits soufrés (H2S, mercaptans) et des composés métalliques présents sous formes de traces ou ultra-traces. L objectif de la thèse est l étude du transfert de ces composés vers l aquifère avec comme cas d étude : le mercure. Un dispositif expérimental a donc été conçu et développé pour (i) mesurer la solubilité dans l eau du mercure gazeux présent dans le gaz stocké, ainsi que (ii) pour étudier les phénomènes d adsorption sur la roche dans les conditions de pression (60 bar) et de température (45C) du réservoir naturel. Les résultats expérimentaux obtenus en laboratoire ont été utilisés dans un modèle numérique afin de simuler le comportement du réservoir et évaluer notamment les quantités de mercure susceptibles de rester en son sein lors de l exploitation du stockage.For nearly 55 years, TIGF operates two gas storages in an aquifer in the southwest of France. The stored gas is mainly composed of methane (CH4 over 90%) but it also contains other light hydrocarbons (<C4H10), nitrogen (N2), carbon dioxide (CO2), sulfur compounds (H2S, mercaptans) and some metallic compounds at traces or ultra traces level. The objective of this thesis was to study the transfer of these compounds to the aquifer with special regard to mercury. An experimental device has been designed and developed to measure (i) the mercury solubility in water and (ii) to study the phenomena of adsorption on the rock in the natural reservoir s conditions (60 bar and 45C). The laboratory results were used in a numerical code to simulate the behavior of the reservoir and assess the mercury amount that may remain in it during the storage operation.PAU-BU Sciences (644452103) / SudocSudocFranceF