Vincent Ayel, L. Araneo, A. Scalambra, Mauro Mameli, C. Romestant, André Piteau, Marco Marengo, Sauro Filippeschi, Yves Bertin,
Tópico(s): Spacecraft and Cryogenic Technologies
2015 - Elsevier BV | International Journal of Thermal Sciences
Jean-Pierre Laurent, Jacqueline Ayel, Franck Thome, Danielle Ziébelin,
Abstract The purpose of this paper is to evaluate and compare three of the most powerful expert system tools available: KEE from Intellicorp, Knowledge Craft from The Carnegie Group Inc., and ART from Inference Corporation. These three tools are industrial development environments which are fully supported and well beyond research prototypes. They were implemented on Lisp machines initially, but will soon be available on conventional computers. The three systems are very flexible and offer many ...
Tópico(s): Scheduling and Optimization Algorithms
1984 - Cambridge University Press | The Knowledge Engineering Review
Helmut Wege, Rihito Watanabe, Volker ter Meulen,
... some similarities to chronic experimental allergic enceph~dor~ayel/tis.
Tópico(s): Multiple Sclerosis Research Studies
1984 - Elsevier BV | Journal of Neuroimmunology
C. Yazbeck, P Madélénat, JP Ayel, L. Jacquesson, LM Bontoux, P Solal, A. Hazout,
Several surgical treatment modalities have been described in cases of isolated or multiple ovarian endometriotic cysts.The aim of this preliminary study was to investigate and test the efficacy of ethanol sclerotherapy (EST) for recurrent endometriotic cysts, before ovarian stimulation in infertile patients with an adequate ovarian status.In the setting of a prospective comparative study, EST was proposed to 31 infertile patients with recurrence of ovarian endometriomas before inclusion in assisted ...
Tópico(s): Intestinal and Peritoneal Adhesions
2009 - Elsevier BV | Reproductive BioMedicine Online
Rémi Bertossi, Zied Lataoui, Vincent Ayel, Cyril Romestant, Yves Bertin,
Axially grooved heat pipes are devices used mainly to dissipate heat flow through the latent heat of phase change of a fluid at a saturation state. Part of the heat injected at the evaporator flows through a micro-region where the meniscus remains hung at the top of each groove. This article presents a steady-state model built to study the heat and mass transfers in this zone. A parametric study has been performed on aluminum/ammonia heat pipes, mainly used for satellite thermal control, and it ...
Tópico(s): Heat Transfer and Optimization
2009 - Taylor & Francis | Numerical Heat Transfer Part A Applications
J.-E. Ayel, Nicolas Bonnevialle, J.-M. Lafosse, L. Pidhorz, Mia Homsy, Pierre Mansat, Xavier Chaufour, M. Rongières, P. Bonnevialle,
Elbow dislocations are the most frequently encountered dislocations after shoulder dislocations. In their vast majority these injuries involve only the joint and carry a good prognosis. Close anatomic proximity to the joint of neurovascular structures put them at risk of concomitant injury but this occurrence remains, actually very rare. The objective of this study is to retrospectively analyze the results of nine cases of elbow dislocations with brachial artery complications and to propose coherent ...
Tópico(s): Shoulder Injury and Treatment
2009 - Elsevier BV | Orthopaedics & Traumatology Surgery & Research
Vincent Ayel, Olivier Lottin, Hassan Peerhossaini,
This paper reviews recent studies on rheology, flow behaviour and heat transfer of two-phase aqueous secondary refrigerants (ice slurries). The difficulties in measuring their rheological properties for which standard rheometers prove to be poorly adapted are analysed. Special attention is paid to “vane-in-cup” rheometers, which can make it possible to determine the yield stress. Pressure losses in cylindrical tubes have been measured by many authors. Even if the results generally agree with two-phase ...
Tópico(s): Granular flow and fluidized beds
2002 - Elsevier BV | International Journal of Refrigeration
Pierre Mansat, J.-E. Ayel, Nicolas Bonnevialle, M. Rongières, M Mansat, P. Bonnevialle,
Tópico(s): Bone fractures and treatments
2010 - Elsevier BV | Orthopaedics & Traumatology Surgery & Research
Christophe Frainais, François Vialard, Nathalie Rougier, Philippe Aegerther, Florence Damond, Jean-Philippe Ayel, C. Yazbeck, A. Hazout, J. Selva,
According french legislation, sperm freezing/thawing procedures are used to prevent ART contaminations in couple with HIV-1 infected men. We determined sperm nuclear fragmentation rate before and after selection and freezing/thawing in HIV-1 14 patients.Two groups of patients were studied: 20 control patients with normal sperm (group 1) and without viral infection and 20 fertile treated HIV-1 patients (group 2). DNA fragmentation was evaluated using terminal uridine nick end labeling, before and after ...
Tópico(s): Reproductive Health and Technologies
2010 - Springer Science+Business Media | Journal of Assisted Reproduction and Genetics
Leonard L. Vasiliev, L. P. Grakovich, M. I. Rabetskii, V. E. Romanenkov, L. L. Vasiliev, Vincent Ayel, Yves Bertin, Cyril Romestant, J. Hugon,
This paper is devoted to the research and development of the advanced nanotechnology design of grooved heat pipes (GHPs) with a thin porous layer (TPL) on their inner surface. Nanotechnologies have a strong impact on the hydrodynamic and heat transfers found in some heat- and power-generating devices. As an object for the investigations, high thermal performance GHPs, manufactured by Thales Alenia Space (France), have been chosen for this study. The coating was designed to improve the cooling capability ...
Tópico(s): Heat Transfer Mechanisms
2010 - Begell House | Heat Pipe Science and Technology An International Journal
Stéphane Lips, Ahlem Bensalem, Yves Bertin, Vincent Ayel, Cyril Romestant, Jocelyn Bonjour,
Various experiments were conducted on two full-size pulsating heat pipes (PHP) which differed from their diameter, number of turns, and working fluid. The analysis of the experimental results showed two kind of operating curves (overall thermal resistance vs. heat rate): for low heat fluxes, the curve is irregular and the PHP performance is sensitive to the orientation. For high heat fluxes, the operating curve is smooth and independent from the orientation. To contribute to the analysis of these ...
Tópico(s): Fluid Dynamics and Heat Transfer
2010 - Elsevier BV | Applied Thermal Engineering
Produção Nacional
Revisado por pares
J.B.A. Oliveira, F. C. Massaro, Ricardo Luis Razera Baruffi, Ana L. Mauri, Cláudia G. Petersen, Liliane FI Silva, L.D. Vagnini, J.G. Franco,
... S76Google Scholar, 11Yazbeck C. Delaroche L. Jacquesson L. Ayel J.-P. Selva J. Rougier N. Intracytoplasmic morphologically ...
Tópico(s): Assisted Reproductive Technology and Twin Pregnancy
2010 - Elsevier BV | Fertility and Sterility
Pierre Oger, C. Yazbeck, Anne Gervais, Béatrice Dorphin, C. Gout, L. Jacquesson, Jean-Philippe Ayel, Vanessa Kahn, Nathalie Rougier,
Abstract The consequences of hepatitis B virus (HBV) infection for fertility are still unclear. Spermatozoa with decreased motility have been reported in HBV-infected patients. It has been demonstrated in vitro that HBV S protein has adverse effects on human sperm function with consequences for fertilization. In a case-control study design, 32 IVF cycles in couples with male HBV infection were compared with 64 cycles in non-infected couples, matched for age, time period, cycle rank and sperm parameters on ...
Tópico(s): Reproductive Biology and Fertility
2011 - Elsevier BV | Reproductive BioMedicine Online
Vincent Ayel, Laurent Lachassagne, Yves Bertin, Cyril Romestant, David Lossouarn,
This paper reports on an experimental study of a capillary pumped loop for terrestrial application (CPLTA) that has been tested using ethanol, methanol, and N-pentane as working fluids. This CPLTA, designed for integrated power electronics cooling in railways, is capable of transferring total heat power of more than 5 kWwhen filled with methanol. First, experiments carried out under transient conditions show the high stability of this device for all the conditions tested, particularly with regard ...
Tópico(s): Heat Transfer and Optimization
2011 - American Institute of Aeronautics and Astronautics | Journal of Thermophysics and Heat Transfer
Rémi Bertossi, Noëlie Guilhem, Vincent Ayel, Cyril Romestant, Yves Bertin,
Axially rotating heat pipes are devices used to dissipate heat flux through the latent heat of phase change of a fluid at saturation state. In these systems, centrifugal forces due to heat pipe rotation allow the liquid to flow. The present study focuses on cylindrical heat pipes due to the simplicity and cost of the manufacturing of theses devices. This paper presents a steady-state model of heat and mass transfers along the rotating heat pipe. An optimization procedure, which permits to work at ...
Tópico(s): Heat Transfer and Optimization
2011 - Elsevier BV | International Journal of Thermal Sciences
Laurent Lachassagne, Vincent Ayel, Cyril Romestant, Yves Bertin,
Tópico(s): Refrigeration and Air Conditioning Technologies
2011 - Elsevier BV | Applied Thermal Engineering
Vincent Ayel, Olivier Lottin, Matthieu Faucheux, D. Sallier, Hassan Peerhossaini,
This paper reports a study of crystallisation kinetics in small volumes of undercooled water–MPG (monopropylene glycol) mixture. The experimental cell is a vertical cylinder (height 5 mm, diameter 2re = 7.5 mm); its bottom section is closed by a Plexiglas disc that transmits light from the lower part of the cylinder to a high-speed digital camera. Photographic recordings allow the determination of the crystal growth rate. When the antifreeze mass fraction is below 25 wt%, crystallisation is clearly ...
Tópico(s): Crystallization and Solubility Studies
2006 - Elsevier BV | International Journal of Heat and Mass Transfer
Gwenael Burban, Vincent Ayel, Alexandre Abraham, Patrick Lagonotte, Yves Bertin, Cyril Romestant,
This paper deals with the experimental results of an unlooped pulsating heat pipe (PHP) developed and tested in an electronic thermal management field with hybrid vehicle applications in mind. The 2.5 mm inner tube diameter device was cooled by an air heat exchanger to replicate the environment of a vehicle. In order to characterize this pulsating heat pipe, four working fluids have been tested. They are acetone, methanol, water, and n-pentane, with applied thermal power ranging from 25 W to 550 ...
Tópico(s): Refrigeration and Air Conditioning Technologies
2012 - Elsevier BV | Applied Thermal Engineering
Laurent Lachassagne, Yves Bertin, Vincent Ayel, Cyril Romestant,
Year after year, the thermal dissipation due to power electronics, among other causes, has been increasing. As the demand for highly efficient cooling systems is correspondingly growing, the classical systems are becoming outdated. In that context, Capillary Pumped Loops may be envisioned as innovative and efficient heat transfer devices, but the data concerning their operation characteristics for terrestrial applications remains scarce. The purpose of this study is to develop a reliable steady ...
Tópico(s): Refrigeration and Air Conditioning Technologies
2012 - Elsevier BV | International Journal of Thermal Sciences
Odile Beyne-Rauzy, Naïs Prade-Houdellier, Cécile Demur, Christian Récher, J.-E. Ayel, Guy Laurent, Véronique Mansat‐De Mas,
Abstract Telomerase catalytic subunit (hTERT) has been shown to play a critical role not only in telomere homeostasis but also in cellular survival, DNA repair, and genetic stability. In a previous study, we described that tumor necrosis factor-×α (TNF×α) induced in the leukemic KG1 cells a senescence state characterized by decreased hTERT activity followed by prolonged growth arrest, increased× β-galactosidase activity, telomere shortening, and major chromosomal instability. Interestingly, granulocyte- ...
Tópico(s): Immunotherapy and Immune Responses
2005 - Elsevier BV | Blood
P. Bonnevialle, Pierre Mansat, Pascal Cariven, Nicolas Bonnevialle, J.-E. Ayel, M Mansat,
Devant la rareté des publications sur la fixation externe (FE) dans les fractures fémorales, les auteurs rapportent leur expérience à propos d’une série rétrospective monocentrique de 53 cas chez 49 patients. Il s’agissait d’adultes jeunes (m = 31 ans) à prédominance masculine, victimes de traumatisme à haute énergie. Tous étaient polyfracturés sauf 7 et 24 étaient polytraumatisés. Quarante-quatre fractures étaient ouvertes (2 types I, 10 types II, 4 types IIIA, 23 types IIIB, et 5 types IIIC de Gustilo). ...
Tópico(s): Trauma and Emergency Care Studies
2005 - Elsevier BV | Revue de Chirurgie Orthopédique et Réparatrice de l Appareil Moteur
Bertrand Marcheix, Xavier Chaufour, J.-E. Ayel, Lucy Hollington, Pierre Mansat, A Barret, Jean-Pierre Bossavy,
Although elbow dislocations are common orthopaedic lesions, vascular complications remain rare. We report the cases of three patients who presented with a rupture of the brachial artery after closed posterior dislocation, which is even more uncommon. Arteriograms were performed in all cases because of the persistent absence of pulses at the wrist after emergency reduction. In each patient, the treatment consisted of the insertion of reversed end-to-end saphenous bridges. None of them presented mid- ...
Tópico(s): Shoulder Injury and Treatment
2005 - Elsevier BV | Journal of Vascular Surgery
Vincent Ayel, Olivier Lottin, Elena Pop, Hassan Peerhossaini,
Tópico(s): Physiological and biochemical adaptations
2004 - Elsevier BV | International Journal of Thermal Sciences
Nicolas Chauris, Vincent Ayel, Yves Bertin, Cyril Romestant,
Evaporation of thin film deposited downstream menisci of slug flows is of major importance in the two-phase heat transfer phenomena occurring inside micro/mini-channels or in pulsating heat pipes. The aim of this study is consequently to analyze, by means of experimental infrared thermography, the heat transfers involved in the motion of a semi-infinite slug flow (one liquid slug followed by one single vapour bubble) in a heated capillary copper tube. Between the liquid and vapour phases the meniscus ...
Tópico(s): Innovative Microfluidic and Catalytic Techniques Innovation
2015 - Elsevier BV | International Journal of Heat and Mass Transfer
Romain Grézaud, François Ayel, Nicolas Rouger, Jean-Christophe Crébier,
Deadtimes are required to avoid simultaneous conduction of high-side and low-side power transistors in half-bridge power converters. During these secure times, free-wheeling current flow generates extra power losses. Very short deadtimes are desired but they cannot be safely set in conventional isolated power converters because of a digital input propagation delay mismatch. A specific deadtime management is introduced in this paper to ensure proper operation of a high-voltage synchronous power converter. ...
Tópico(s): Multilevel Inverters and Converters
2016 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Power Electronics
Daniel Zabek, J. Taylor, Vincent Ayel, Yves Bertin, Cyril Romestant, Chris Bowen,
Low temperature thermal to electrical energy converters have the potential to provide a route for recovering waste energy. In this paper, we propose a new configuration of a thermal harvester that uses a naturally driven thermal oscillator free of mechanical motion and operates between a hot heat source and a cold heat sink. The system exploits a heat induced liquid-vapour transition of a working fluid as a primary driver for a pyroelectric generator. The two-phase instability of a fluid in a closed ...
Tópico(s): Phase Change Materials Research
2016 - American Institute of Physics | Journal of Applied Physics
Amaury Charre, Stéphanie Delclaux, Costel Apredoai, Jean-Emmanuel Ayel, M. Rongières, Pierre Mansat,
Scaphocapitate arthrodesis with lunate excision was performed for treatment of advanced Kienböck disease in 17 patients (18 wrists). Ten were women and seven men. Five were Lichtmann Stage IIIA, 12 Stage IIIB, and one Stage IV. Minimum follow-up period was 24 months; mean follow-up was 10.7 years (range 2.3 to 22 years, SD 7.1). At the latest follow-up, six patients were very satisfied, nine were satisfied and two were disappointed. Pain was significantly decreased in all cases. Wrist mobility was ...
Tópico(s): Elbow and Forearm Trauma Treatment
2017 - SAGE Publishing | Journal of Hand Surgery (European Volume)
L Larue, Gwénola Keromnès, A. Massari, Clémence Roche, Julie Moulin, H. Gronier, Dominique Bouret, Nino Guy Cassuto, J.-P. Ayel,
To determine whether transvaginal ultrasound-guided embryo transfer is a technique that can be used routinely, whether it improves IVF outcomes and whether it makes difficult transfers easier and more successful.Non-randomized retrospective study conducted between 2012 and 2016 in the fertility center of the Diaconesses-Croix St-Simon hospital group. The outcomes of 3910 transfers, performed by 5 senior operators, under transabdominal ultrasound guidance are compared with those of 800 transfers, ...
Tópico(s): Reproductive Biology and Fertility
2017 - Elsevier BV | Journal of Gynecology Obstetrics and Human Reproduction
Anselmo Cecere, Davide De Cristofaro, Raffaele Savino, Vincent Ayel, Thibaud Solé-Agostinelli, Marco Marengo, Cyril Romestant, Yves Bertin,
A Flat Plate Pulsating Heat Pipe (FPPHP) filled with an ordinary liquid (water) and a self-rewetting mixture (dilutes aqueous solutions of long-chain alcohols with unusual surface tension behavior) is investigated under variable gravity conditions on board a 'Zero-g' plane during the 65th Parabolic Flight Campaign of the European Space Agency. The FPPHP thermal performance in terms of evaporator and condenser temperatures, start-up levels and flow regimes is characterized for the two working fluids ...
Tópico(s): Fluid Dynamics and Thin Films
2018 - Elsevier BV | Acta Astronautica
Vincent Ayel, L. Araneo, Pietro Marzorati, Cyril Romestant, Yves Bertin, Marco Marengo,
A particular flat plate pulsating heat pipe (FPPHP), filled with FC72, is tested during the 62th and 64th ESA parabolic flight campaigns under vertical orientation. The FPPHP is made of a thin copper plate, in which a curved channel disposed with 11 U-turns is milled and closed on the top face by a transparent borosilicate plate. The particular characteristics is that the equivalent hydraulic diameter of the square channel (2.5 × 2.5 mm²) is above the working fluid capillary diameter on ground, inducing ...
Tópico(s): Spacecraft and Cryogenic Technologies
2018 - Taylor & Francis | Heat Transfer Engineering