750 research outputs found
Closing Keynote Address by Dr. Patrice Buckner Jackson (Dr. PBJ)
Get PDFDr. Patrice Buckner Jackson (Dr. PBJ), author of Disrupting Burnout, will challenge conventional views on work-life balance and reveal practical approaches to overcoming burnout. Drawing on her extensive experience in education and leadership, Dr. PBJ will share insights on reclaiming purpose, cultivating resilience, and building sustainable habits that empower professionals to thrive. Through inspiring stories and actionable strategies, she will guide attendees in rethinking their approach to wellness, encouraging them to disrupt burnout and create meaningful change in both their personal and professional lives
High pressure DSC characterization of clathrate and semi-clathrate gas hydrates for potential industrial applications
No full textNational audienceGas hydrates are ice-like compounds in which gas molecules, mostly light hydrocarbons, acid gases (CO2, H2S), N2, or H2, are entrapped into polyhedral cavities formed by hydrogen-bonded water molecules. Those compounds have long been studied in relation with flow assurance and safety issues in the oil and gas industry, where their occurrence is a risk that must be controlled and, possibly, avoided. More recently, industrial applications of gas hydrates were proposed in various fields, such as gas storage and transport, gas separation, water purification, or refrigeration engineering. The potential development of such technologies is regarded as promising, due to the low cost, environmental inocuity and total reusability of the main reactant involved, namely water. This prospect has sparked a new demand for measurement and modelling of the properties of these structures. Thermodynamic and thermo physical properties, as well as formation kinetics of gas hydrates are of particular interest for the design, economical assessment, and up scaling of hydrate-based processes.Pressure-controlled DSC has been used extensively to characterize different types of hydrates (1-5). Accurate methods were developed for that purpose (6) and applied to a variety of gas + water + additives systems (1-5, 7, 8). The numerous data acquired have been used to develop rigorous thermodynamic models (9-11) that are capable of predicting thermodynamic limits of stability and dissociation enthalpies of those structures, thus providing useful tools for future process design.References1. M.C. Martinez, D. Dalmazzone, W. Fürst, A. Delahaye, L. Fournaison. AIChE J., 54 (2008) 10882. D. Dalmazzone, N. Hamed, C. Dalmazzone. Chem. Eng. Sci., 64 (2009) 20203. J. Deschamps, D. Dalmazzone. J. Therm. Anal. Calorim., 98 (2009) 1134. N. Mayoufi, D. Dalmazzone, W. Fürst, A. Delahaye, L. Fournaison. J. Chem. Eng. Data, 55 (2010) 12715. N. Mayoufi, D. Dalmazzone, A. Delahaye, P. Clain, L. Fournaison, W. Fürst. J. of Chem. Eng. Data, 56 (2011) 29876. W. Lin, D. Dalmazzone, W. Fürst, A. Delahaye, L. Fournaison, P. Clain. J. Chem. Thermody., 61 (2013) 1327. A. Karimi, O. Dolotko, D. Dalmazzone. Fluid Phase Equilib., 361 (2014) 175.8. W. Lin, D. Dalmazzone, W. Fürst, A. Delahaye, L. Fournaison, P. Clain. Fluid Phase Equilib., 372 (2014), 639. A. Fukumoto, P. Paricaud, D. Dalmazzone, W. Bouchafaa, T. T.-S. Ho, W. Fürst. J. Chem. Eng. Data, 59 (2014) 319310. A. Fukumoto, D. Dalmazzone, P. Paricaud, W. Fürst. J. Chem. Eng. Data, 60 (2015) 34311. A. Fukumoto, L. P. Sales Silva, P. Paricaud, D. Dalmazzone, W. Fürst. Int. J. Hydrogen Energ., 40 (2015) 925
Sémantique et TALN : première approche
No full text@incollection{OL-ENJALBERT-2005, author = {Patrice Enjalbert}, title = {{S{é}mantique et TALN : premi{è}re approche}}, chapter = {1}, pages = {27-52}, booktitle = {S{é}mantique et traitement automatique des langues}, editor = {Patrice Enjalbert}, series = {Trait{é} IC2, s{é}rie Cognition et traitement de l'information}, publisher = {Herm{è}s Sciences, Lavoisier}, year = {2005}
L'extraction d'information
No full text@incollection{OL-ENJALBERT-2005-3, author = {Patrice Enjalbert}, title = {{L'extraction d'information}}, chapter = {8}, pages = {309-334}, booktitle = {S{é}mantique et traitement automatique des langues}, editor = {Patrice Enjalbert}, series = {Trait{é} IC2, s{é}rie Cognition et traitement de l'information}, publisher = {Herm{è}s Sciences, Lavoisier}, year = {2005}
potentials, and fullerenes
No full text17 pagesInternational audienceA new perturbation scheme based on the Barker-Henderson perturbation theory [J. Chem. Phys. 47, 4714 (1967)] is proposed to predict the thermodynamic properties of spherical molecules. Accurate predictions of second virial coefficients and vapor-liquid coexistence properties are obtained for a large variety of potential functions (square well, Yukawa, Sutherland, Lennard-Jones, Buckingham, Girifalco). New Gibbs ensemble Monte Carlo simulations of the generalized exp- m Buckingham potential are reported. An extension of the perturbation approach to mixtures is proposed, and excellent predictions of vapor-liquid equilibria are obtained for Lennard-Jones mixtures. The perturbation scheme can be applied to complex potential functions fitted to ab initio data to predict the properties of real molecules such as neon. The new approach can also be used as an auxiliary tool in molecular simulation studies, to efficiently optimize an intermolecular potential on macroscopic properties or match force fields based on different potential functions. © 2006 American Institute of Physics
Recherche d'information géographique
No full text@incollection{OL-BILHAUT-2005, author = {Fr{é}d{é}rik Bilhaut and Patrice Enjalbert}, title = {{Recherche d'information g{é}ographique}}, chapter = {10}, pages = {371-406}, booktitle = {S{é}mantique et traitement automatique des langues}, editor = {Patrice Enjalbert}, series = {Trait{é} IC2, s{é}rie Cognition et traitement de l'information}, publisher = {Herm{è}s Sciences, Lavoisier}, year = {2005}
L'accès assisté à l'information documentaire
No full text@incollection{OL-ENJALBERT-2005-4, author = {Patrice Enjalbert and Fr{é}d{é}rik Bilhaut}, title = {{L'acc{è}s assist{é} {à} l'information documentaire}}, chapter = {9}, pages = {335-370}, booktitle = {S{é}mantique et traitement automatique des langues}, editor = {Patrice Enjalbert}, series = {Trait{é} IC2, s{é}rie Cognition et traitement de l'information}, publisher = {Herm{è}s Sciences, Lavoisier}, year = {2005}
Modeling the Dissociation Conditions of Salt Hydrates and Gas Semiclathrate Hydrates: Application to Lithium Bromide, Hydrogen Iodide, and Tetra-<i>n</i>-butylammonium Bromide + Carbon Dioxide Systems
No full textInternational audienceA thermodynamic approach is proposed to determine the dissociation conditions of salt hydrates and semiclathrate hydrates. The thermodynamic properties of the liquid phase are described with the SAFT-VRE equation of state, and the solid-liquid equilibria are solved by applying the Gibbs energy minimization criterion under stoichiometric constraints. The methodology is applied to water + halide salt systems, and an excellent description of the solid liquid coexistence curves is obtained. The approach is extended to the water + tetra-n-butylammonium bromide (TBAB) binary mixture, and an accurate representation of the solid liquid coexistence curves and dissociation enthalpies is obtained. The van der Waals-Platteeuw (vdW-P) theory combined with the new model for salt hydrates is used to determine the dissociation temperatures of semiclathrate hydrates of TBAB + carbon dioxide. A good description of the dissociation pressures of CO(2) semiclathrate hydrates is obtained over wide temperature, pressure, and TBAB composition ranges (AAD = 10.5%). For high TBAB weight fractions the new model predicts a change of hydrate structure from type A to type B as the partial pressure of CO(2) is increased. The model can also capture a change of behavior with respect to TBAB concentration, which has been observed experimentally: an increase of the TBAB weight fraction leads to a stabilization of the gas semiclathrate hydrate at low initial TBAB concentrations below the stoichiometric composition but leads to a destabilization of the hydrate at TBAB concentrations above the stoichiometric compositio
Actualité d'une approche sémantique du document numérique
No full text@inproceedings{CN-ENJALBERT-2004, address = {La Rochelle, France}, author = {Patrice Enjalbert and Mauro Gaio}, title = {{Actualit{é} d'une approche s{é}mantique du document num{é}rique}}, booktitle = {Actes du 7{è}me Colloque International sur le Document Electronique (CIDE.7)}, editor = {Patrice Enjalbert and Mauro Gaio}, month = {juin}, pages = {13-28}, publisher = {Europe IA}, year = {2004} }National audienc
Modélisation thermodynamique des mélanges liés aux systèmes de réfrigération à absorption et au captage de CO2
No full textLes émissions de CO2 provenant des activités industrielles ont été un facteur majeur de la hausse rapide des températures mondiales au cours du siècle dernier. La menace du réchauffement climatique a poussé la plupart des pays industrialisés à s'engager à réduire les concentrations de CO2. Cette thèse est consacrée à deux thèmes liés à la réduction des émissions de CO2. La première partie consiste à utiliser des systèmes de pompes à chaleur à absorption pour convertir l'énergie de basse qualité en énergie de haute qualité, augmentant ainsi l'efficacité énergétique des systèmes industriels, réduisant la consommation d'énergie et les émissions de CO2. Les données VLE des solutions IL-eau ont été corrélées en utilisant les modèles NRTL et e-NRTL. Des calculs supplémentaires ont été effectués pour évaluer les performances des fluides de travail dans les ARS sous différentes conditions de fonctionnement. Les résultats indiquent que la paire de travail sélectionnée présente de bonnes performances et un potentiel de remplacement des paires traditionnelles.La deuxième partie de la thèse se concentre sur la modélisation des mélanges contenant du CO2 , and particulier les mélanges avec les alcanes et les fluides frigorigènes. La version multipolaire de l’équations d'état SAFT-VR Mie a été choisie pour étudier le comportement de phase et les propriétés de transport de ces mélanges. Un modèle prédictif pour ces mélanges a ainsi été développé, afin de déterminer leurs équilibres entre phase. Un très bon accord avec les données expérimentales de corps pur et des mélanges est obtenu, démontrant le rôle important du terme multipolaire dans l’équation d’état.CO2 emissions from industrial activities have been a major factor in the rapid rise in global temperatures over the last century. The threat of global warming has prompted most industrialized countries to commit to reducing CO2 concentrations. This thesis focuses on two themes related to CO2 emission reduction. The first part is to use absorption heat pump systems to convert low-grade energy into high-grade energy, thereby increasing the energy efficiency of industrial systems, reducing energy consumption and CO2 emissions. The ELV data of IL-water solutions were correlated using NRTL and e-NRTL models. Additional calculations were performed to evaluate the performance of working fluids in ARS under different operating conditions. The results indicate that the selected working pair has good performance and potential to replace traditional pairs.The second part of the thesis focuses on the modeling of mixtures containing CO2, and in particular mixtures with alkanes and refrigerants. The multipolar version of the SAFT-VR Mie equation of state was chosen to study the phase behaviour and transport properties of these mixtures. A predictive model for these mixtures was thus developed, in order to determine their phase equilibria. A very good agreement with the pure component and mixture experimental data is obtained, demonstrating the important role of the multipolar term in the equation of state
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