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381 results on '"Dumitrescu, O."'

2. Edge contraction on dual ribbon graphs and 2D TQFT

Author

Dumitrescu, O and Mulase, M

Subjects
Topological quantum field theory, Frobenius algebras, Ribbon graphs, Cell graphs, math.AG, math-ph, math.MP, math.QA, Primary: 14N35, 81T45, 14N10, Secondary: 53D37, 05A15, General Mathematics, Pure Mathematics
Abstract

We present a new set of axioms for 2D TQFT formulated on the category of cell graphs with edge-contraction operations as morphisms. We construct a functor from this category to the endofunctor category consisting of Frobenius algebras. Edge-contraction operations correspond to natural transformations of endofunctors, which are compatible with the Frobenius algebra structure. Given a Frobenius algebra A, every cell graph determines an element of the symmetric tensor algebra defined over the dual space A⁎. We show that the edge-contraction axioms make this assignment depending only on the topological type of the cell graph, but not on the graph itself. Thus the functor generates the TQFT corresponding to A.

Published
2018

3. Lectures on the Topological Recursion for Higgs Bundles and Quantum Curves

Author

Dumitrescu, O and Mulase, M

Subjects
math.AG, math.AG, math-ph, math.MP, Primary: 14H15, 14N35, 81T45, Secondary: 14F10, 14J26, 33C05, 33C10, 33C15, 34M60, 53D37
Abstract

© 2018 World Scientific Publishing Co. Pte. Ltd. This chapter aims at giving an introduction to the notion of quantum curves. The main purpose is to describe the new discovery of the relation between the following two disparate subjects: one is the topological recursion, that has its origin in random matrix theory and has been effectively applied to many enumerative geometry problems; and the other is the quantization of Hitchin spectral curves associated with Higgs bundles. Our emphasis is on explaining the motivation and examples. Concrete examples of the direct relation between Hitchin spectral curves and enumeration problems are given. A general geometric framework of quantum curves is also discussed.

Published
2018

7. Quantum Curves for Hitchin Fibrations and the Eynard-Orantin Theory

Author

Dumitrescu, O and Mulase, M

Abstract

We generalize the topological recursion of Eynard-Orantin (JHEP 0612:053, 2006; Commun Number Theory Phys 1:347-452, 2007) to the family of spectral curves of Hitchin fibrations. A spectral curve in the topological recursion, which is defined to be a complex plane curve, is replaced with a generic curve in the cotangent bundle T*C of an arbitrary smooth base curve C. We then prove that these spectral curves are quantizable, using the new formalism. More precisely, we construct the canonical generators of the formal h{stroke}-deformation family of D modules over an arbitrary projective algebraic curve C of genus greater than 1, from the geometry of a prescribed family of smooth Hitchin spectral curves associated with the SL(2, ℂ)-character variety of the fundamental group π1(C). We show that the semi-classical limit through the WKB approximation of these h{stroke}-deformed D modules recovers the initial family of Hitchin spectral curves. © 2014 Springer Science+Business Media Dordrecht.

Published
2014

9. A matched case–control study of toxoplasmosis after allogeneic haematopoietic stem cell transplantation: still a devastating complication

Author

Ader, F., Bachy, E., Balsat, M., Barraco, F., Benech, N., Bienvenu, A.-L., Billaud, G., Biron, F., Boibieux, A., Chidiac, C., Conrad, A., Ducastelle-Leprêtre, S., Dumitrescu, O., Dupont, D., Escuret, V., Ferry, T., Fossard, G., Frobert, E., Gilis, L., Goutelle, S., Grateau, A., Guillermin, Y., Heiblig, M., Labussière-Wallet, H., Le Maréchal, M., Lebras, L., Lina, B., Lina, G., Miailhes, P., Michallet, A.-S., Michallet, M., Michallet, M.-C., Monneret, G., Morfin-Sherpa, F., Nicolini, F.-E., Perpoint, T., Peyrouse de Montclos, M., Picot, S., Poitevin-Later, F., Quintela, A., Rabodonirina, M., Roux, S., Saison, J., Salles, G., Sarkozy, C., Sénéchal, A., Sobh, M., Thomas, X., Valour, F., Wallet, F., Wallon, M., and Wattel, E.

Published
2016
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12. Clinical Presentation, Diagnosis, and Bacterial Epidemiology of Peritoneal Tuberculosis in Two University Hospitals in France

Author

Cavalli, Zoé, Ader, Florence, Valour, Florent, Saison, Julien, Boussel, Loïc, Dumitrescu, Oana, Perpoint, Thomas, Chidiac, Christian, May, Thierry, Ferry, Tristan, Adelaïde, L., Ader, F., Biron, F., Boibieux, A., Bouaziz, A., Bouledrak, K., Braun, E., Broussolle, C., Carret, G., Catho, G., Charhon, N., Chidiac, C., Chumbi-Flores, W., Coppere, B., Couraud, S., Demontclos, M., Devouassoux, G., Dumitrescu, O., Ernesto, S., Ferry, T., Floret, D., Fredenucci, I., Freymond, N., Gardes, S., Gerbier-Colomban, S., Gillet, Y., Girard-Madoux, M. H., Goutelle, S., Grando, J., Grima, R., Hees, L., Hodille, E., Hot, A., Karsenty, J., Kiakouama-Maleka, L., Lina, G., Maury, J. M., Miailhes, P., Moreau, L., Nesme, P., Ninet, J., Perard, L., Perpoint, T., Perrot, E., Ranc, A. G., Rasigade, J. P., Reix, R., Renaud-Baron, A. S., Saison, J., Senechal, A., Sève, P., Souquet, P. J., van Thai, H., Tronc, F., Valour, F., Vanhems, P., and Lyon TB Study group

Published
2016
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39. Long-term use of liposomal nebulized amikacin and tedizolid for the treatment of disseminated nocardiosis after allogeneic hematopoietic stem cell transplantation.

Author

Soueges, Sarah, Triffault-Fillit, Claire, Roux, Sandrine, Labussière-Wallet, Hélène, Lebeaux, David, Dumitrescu, Oana, Morelec, Isabelle, Hodille, Elisabeth, Ader, Florence, On behalf of the Lyon HEMINF study group, Ader, F., Alcazer, V., Bachy, E., Balsat, M., Barraco, F., Boccard, M., Conrad, A., Ducastelle-Leprêtre, S., Dumitrescu, O., and Dupont, D.

Subjects
HEMATOPOIETIC stem cell transplantation, NOCARDIOSIS, AMIKACIN, OPPORTUNISTIC infections, NOCARDIA
Abstract

Nocardiosis is a life-threatening opportunistic infection in immunocompromised patients. Herein, we present successful adjunctive use of liposomal nebulized amikacin and tedizolid in a recipient of allogeneic hematopoietic stem cell transplantation infected with Nocardia nova complex who presented multiple complications to conventional therapeutic options. [ABSTRACT FROM AUTHOR]

Published
2021
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42. Assessment of VITEK® MS IVD database V3.0 for identification of Nocardia spp. using two culture media and comparing direct smear and protein extraction procedures

Author

Durand, T., primary, Vautrin, F., additional, Bergeron, E., additional, Girard, V., additional, Polsinelli, S., additional, Monnin, V., additional, Durand, G., additional, Dauwalder, O., additional, Dumitrescu, O., additional, Laurent, F., additional, and Rodríguez-Nava, V., additional

Published
2019
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45. ACKNOWLEDGEMENT OF REVIEWERS

Author

Adams, NG, Adekambi, T, Afeltra, J, Aguado, J, Aires de Sousa, M, Akiyoshi, K, Al Hasan, M, Ala-Kokko, T, Albert, M, Alfandari, S, Allen, D, Allerberger, F, Almyroudis, N, Alp, E, Amin, R, Anderson-Berry, A, Andes, DR, Andremont, A, Andreu, A, Angelakis, M, Antachopoulos, C, Antoniadou, A, Arabatzis, M, Arlet, G, Arnez, M, Arnold, C, Asensio, A, Asseray, N, Ausiello, C, Avni, T, Ayling, R, Baddour, L, Baguelin, M, Bányai, K, Barbour, A, Basco, LK, Bauer, D, Bayston, R, Beall, B, Becker, K, Behr, M, Bejon, P, Belliot, G, Benito-Fernandez, J, Benjamin, D, Benschop, K, Berencsi, G, Bergeron, MG, Bernard, K, Berner, R, Beyersmann, J, Bille, J, Bizzini, A, Bjarnsholt, T, Blanc, D, Blanco, J, Blot, S, Bohnert, J, Boillat, N, Bonomo, R, Bonten, M, Bordon, JM, Borel, N, Boschiroli, ML, Bosilkovski, M, Bosso, JA, Botelho-Nevers, E, Bou, G, Bretagne, S, Brouqui, P, Brun-Buisson, C, Brunetto, M, Bucher, H, Buchheidt, D, Buckling, A, Bulpa, P, Cambau, E, Canducci, F, Cantón, R, Capobianchi, M, Carattoli, A, Carcopino, X, Cardona-Castro, N, Carling, PC, Carrat, F, Castilla, J, Castilletti, C, Cavaco, L, Cavallo, R, Ceccherini-Silberstein, F, Centrón, D, Chappuis, F, Charrel, R, Chen, M, Chevaliez, S, Chezzi, C, Chomel, B, Chowers, M, Chryssanthou, E, Ciammaruconi, A, Ciccozzi, M, Cid, J, Ciofu, O, Cisneros, D, Ciufolini, MG, Clark, C, Clarke, SC, Clayton, R, Clementi, M, Clemons, K, Cloeckaert, Ael, Cloud, J, Coenye, T, Cohen Bacri, S, Cohen, R, Coia, J, Colombo, A, Colson, P, Concerse, P, Cordonnier, C, Cormican, M, Cornaglia, G, Cornely, O, Costa, S, Cots, F, Craxi, A, Creti, R, Crnich, C, Cuenca Estrella, M, Cusi, MG, d'Ettorre, G, da Cruz Lamas, C, Daikos, G, Dannaoui, E, De Barbeyrac, B, De Grazia, S, de Jager, C, de Lamballerie, X, de Marco, F, del Palacio, A, Delpeyroux, F, Denamur, E, Denis, O, Depaquit, J, Deplano, A, Desenclos, J-C, Desjeux, P, Deutch, S, Di Luca, D, Dianzani, F, Diep, B, Diestra, K, Dignani, C, Dimopoulos, G, Divizia, M, Doi, Y, Dornbusch, HJ, Dotis, J, Drancourt, M, Drevinek, P, Dromer, F, Dryden, M, Dubreuil, L, Dubus, J-C, Dumitrescu, O, Dumke, R, DuPont, H, Edelstein, M, Eggimann, P, Eis-Huebinger, A-M, El Atrouni, WI, Entenza, J, Ergonul, O, Espinel-Ingroff, A, Esteban, J, Etienne, J, Fan, X-G, Fenollar, F, Ferrante, P, Ferrieri, P, Ferry, T, Feuchtinger, T, Finegold, S, Fingerle, V, Fitch, M, Fitzgerald, R, Flori, P, Fluit, A, Fontana, R, Fournier, PE, François, M, Francois, P, Freedman, DO, Friedrich, A, Gallego, L, Gallinella, G, Gangneux, J-P, Gannon, V, Garbarg-Chenon, A, Garbino, J, Garnacho-Montero, J, Gatermann, Soeren, Gautret, P, Gentile, G, Gerlich, W, Ghannoum, M, Ghebremedhin, B, Ghigo, E, Giamarellos-Bourboulis, E, Girgis, R, Giske, C, Glupczynski, Y, Gnarpe, J, Gomez-Barrena, E, Gorwitz, RJ, Gosselin, R, Goubau, P, Gould, E, Gradel, K, Gray, J, Gregson, D, Greub, G, Grijalva, CG, Groll, A, Groschup, M, Gutiérrez, J, Hackam, DG, Hall, WA, Hallett, R, Hansen, S, Harbarth, S, Harf-Monteil, C, Hasanjani, Roushan MR, Hasler, P, Hatchette, T, Hauser, P, He, Q, Hedges, A, Helbig, J, Hennequin, C, Herrmann, B, Hezode, C, Higgins, P, Hoesli, I, Hoiby, N, Hope, W, Houvinen, P, Hsu, LY, Huard, R, Humphreys, H, Icardi, M, Imoehl, M, Ivanova, K, Iwamoto, T, Izopet, J, Jackson, Y, Jacobsen, K, Jang, TN, Jasir, A, Jaulhac, B, Jaureguy, F, Jefferies, JM, Jehl, F, Johnstone, J, Joly-Guillou, M-L, Jonas, M, Jones, M, Joukhadar, C, Kahl, B, Kaier, K, Kaiser, L, Kato, H, Katragkou, A, Kearns, A, Kern, W, Kerr, K, Kessin, R, Kibbler, C, Kimberlin, D, Kittang, B, Klaassen, C, Kluytmans, J, Ko, W-C, Koh, W-J, Kostrzewa, M, Kourbeti, I, Krause, R, Krcmery, V, Krizova, P, Kuijper, E, Kullberg, B-J, Kumar, G, Kunin, CM, La Scola, B, Lagging, M, Lagrou, K, Lamagni, T, Landini, P, Landman, D, Larsen, A, Lass-Floerl, C, Laupland, K, Lavigne, JP, Leblebicioglu, H, Lee, B, Lee, CH, Leggat, P, Lehours, P, Leibovici, Lonard, Leon, L, Leonard, N, Leone, M, Lescure, X, Lesprit, P, Levy, PY, Lew, D, Lexau, CA, Li, S-Y, Li, W, Lieberman, D, Lina, B, Lina, G, Lindsay, JA, Livermore, D, Lorente, L, Lortholary, O, Lucet, J-C, Lund, B, Lütticken, R, MacLeod, C, Madhi, S, Maertens, J, Maggi, F, Maiden, M, Maillard, J-Y, Maira-Litran, T, Maltezou, H, Manian, FA, Mantadakis, E, Maragakis, L, Marcelin, A-G, Marchaim, D, Marchetti, O, Marcos, M, Markotic, A, Martina, B, Martínez, J, Martinez, J-L, Marty, F, Maurin, M, McGee, L, Mediannikov, O, Meersseman, W, Megraud, F, Meletiadis, J, Mellmann, A, Meyer, E, Meyer, W, Meylan, P, Michalopoulos, A, Micol, R, Midulla, F, Mikami, Y, Miller, RF, Miragaia, M, Miriagou, V, Mitchell, TJ, Miyakis, S, Mokrousov, I, Monecke, S, Mönkemüller, K, Monno, L, Monod, M, Morales, G, Moriarty, F, Morosini, I, Mortensen, E, Mubarak, K, Mueller, B, Mühlemann, K, Muñoz Bellido, JL, Murray, P, Muscillo, M, Mylotte, J, Naessens, A, Nagy, E, Nahm, MH, Nassif, X, Navarro, D, Navarro, F, Neofytos, D, Nes, I, Ní Eidhin, D, Nicolle, L, Niederman, MS, Nigro, G, Nimmo, G, Nordmann, P, Nougairède, A, Novais, A, Nygard, K, Oliveira, D, Orth, D, Ortiz, JR, Osherov, N, Österblad, M, Ostrosky-Zeichner, L, Pagano, L, Palamara, AT, Pallares, R, Panagopoulou, P, Pandey, P, Panepinto, J, Pappas, G, Parkins, M, Parola, P, Pasqualotto, A, Pasteran, F, Paul, M, Pawlotsky, J-M, Peeters, M, Peixe, L, Pepin, J, Peralta, G, Pereyre, S, Perfect, JR, Petinaki, E, Petric, M, Pettigrew, M, Pfaller, M, Philipp, M, Phillips, G, Pichichero, M, Pierangeli, A, Pierard, D, Pigrau, C, Pilishvili, T, Pinto, F, Pistello, M, Pitout, J, Poirel, L, Poli, G, Poppert, S, Posfay-Barbe, K, Pothier, P, Poxton, I, Poyart, C, Pozzetto, B, Pujol, M, Pulcini, C, Punyadeera, C, Ramirez, M, Ranque, S, Raoult, D, Rasigade, J-P, Re, MC, Reilly, JS, Reinert, R, Renaud, B, Rice, L, Rich, S, Richet, H, Rigouts, L, Riva, E, Rizzo, C, Robotham, J, Rodicio, MR, Rodriguez, J, Rodriguez-Bano, J, Rogier, C, Roilides, E, Rolain, J-M, Rooijakkers, S, Rooney, P, Rossi, F, Rotimi, V, Rottman, M, Roux, V, Ruhe, J, Russo, G, Sadowy, E, Sagel, U, Said, SI, Saijo, M, Sak, B, Sa-Leao, R, Sanders, EAM, Sanguinetti, M, Sarrazin, C, Savelkoul, P, Scheifele, D, Schmidt, W-P, Schønheyder, H, Schönrich, G, Schrenzel, J, Schubert, S, Schwarz, K, Schwarz, S, Sefton, A, Segondy, M, Seifert, H, Seng, P, Senneville, E, Sexton, D, Shafer, RW, Shalit, I, Shankar, N, Shata, TM, Shields, J, Sibley, C, Sicinschi, L, Siljander, T, Simitsopoulou, M, Simoons-Smit, AM, Sissoko, D, Sjögren, J, Skiada, A, Skoczynska, A, Skov, R, Slack, M, Sogaard, M, Sola, C, Soriano, A, Sotto, A, Sougakoff, W, Souli, M, Spelberg, B, Spelman, D, Spiliopoulou, I, Springer, B, Stefani, S, Stein, A, Steinbach, WJ, Steinbakk, M, Strakova, L, Strenger, V, Sturm, P, Sullivan, P, Sutton, D, Symmons, D, Tacconelli, E, Tamalet, C, Tang, JW, Tang, Y-W, Tattevin, P, Thibault, V, Thomsen, RW, Thuny, F, Tong, S, Torres, C, Townsend, R, Tristan, A, Trouillet, J-L, Tsai, H-C, Tsitsopoulos, P, Tuerlinckx, D, Tulkens, P, Tumbarello, M, Tureen, J, Turnidge, JD, Turriziani, O, Tutuian, R, Uçkay, I, Upton, M, Vabret, A, Vamvakas, EC, van den Boom, D, Van Eldere, J, van Leeuwen, W, van Strijp, J, Van Veen, S, Vandamme, P, Vandenesch, F, Vayssier, M, Velin, D, Venditti, M, Venter, M, Venuti, A, Vergnaud, G, Verheij, T, Verhofstede, C, Viscoli, C, Vizza, CD, Vogel, U, Waller, A, Wang, YF, Warn, P, Warris, A, Wauters, G, Weidmann, M, Weill, F-X, Weinberger, M, Welch, D, Wellinghausen, N, Wheat, J, Widmer, A, Wild, F, Willems, R, Willinger, B, Winstanley, C, Witte, W, Wolff, M, Wong, F, Wootton, M, Wyllie, D, Xu, W, Yamamoto, S, Yaron, S, Yildirim, I, Zaoutis, T, Zazzi, M, Zbinden, R, Zehender, Gianguglielmo G, Zemlickova, H, Zerbini, ML, Zhang, L, Zhang, Y, Zhao, Y-D, Zhu, Z, and Zimmerli, W

Published
2011
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46. Losses and blade tip clearance for a centrifugal compressor

Author

Dumitrescu, O., Stanciuc, R., Gherman, G. B., Dragan, Valeriu, Dumitrescu, O., Stanciuc, R., Gherman, G. B., and Dragan, Valeriu

Abstract

The present paper presents the numerical analysis for a transonic centrifugal compressor using steady state CFD. The blade tip clearance effect over the position of shock waves, tip losses and the performances of the impeller are studied. Numerical simulations have been performed using RANS modelling, with the k-omega SST turbulence model (Shear Stress Transport). Eight cases were taken into consideration for the impeller with the following blade tip clearances values: 0 mm, 0.1 mm, 0.3 mm, 0.4 mm, 0.5mm, 0.7 mm, 1 mm, 2 mm, at the same operating conditions. For the entire stage only seven cases were studied, without the value for 0.1 mm because of its abnormal behaviour, as can be seen in the case of the impeller simulations. Results showed that the position of the shock wave does not change with the increase of the tip clearance. Aerodynamic losses due to shock wave, secondary flow and turbulence can be seen in the polytropic efficiency of the centrifugal impeller and the difference between the two extreme cases is about 3.2 %., QC 20181101

Published
2018
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