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555 results on '"Dumont, Alexandre"'

1. Low frequency noise in AC biased metallic tunnel junctions

Author

Fontaine, Nicolas, Dumont, Alexandre, and Reulet, Bertrand

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We study the effect of an AC bias on the low frequency noise, notably $1/f^\gamma$ with $\gamma<2$, of metal-insulator-metal tunnel junctions at room temperature. The measurement is performed in the 6Hz-100kHz frequency range with an AC excitation above 1MHz. We observe that $1/f^\gamma$ noise is dominant across our measurements though the shape of the spectra varies. The effect of the DC excitation seems to be very different on the noise generated by the junction than that of the AC excitation, thus questioning the fact that the observed noise is due to resistance fluctuations that the bias only reveals., Comment: 3 pages, 3 figures, to be published in IEEE xplore ICNF 2023 conference proceedings

Published
2023
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2. Probability Currents in Out-of-Equilibrium Microwave Circuits

Author

Dumont, Alexandre, Février, Pierre, Lupien, Christian, and Reulet, Bertrand

Subjects
Condensed Matter - Statistical Mechanics
Abstract

In this work we reconstruct the probability current in phase space of out-of-equilibrium microwave circuits. This is achieved by a statistical analysis of short-time correlations in time domain measurements. It allows us to check locally in phase space the violation of detailed balance or the presence of fluctuation loops. We present the data analysis methods and experimental results for several microwave circuits driven by two noise sources in the 4-8GHz frequency range., Comment: 4 pages

Published
2023
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5. Violation of detailed balance in microwave circuits: theory and experiment

Author

Dumont, Alexandre, Février, Pierre, Lupien, Christian, and Reulet, Bertrand

Subjects
Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

We propose a new approach to detailed balance violation in electrical circuits by relying on the scattering matrix formalism commonly used in microwave electronics. This allows to include retardation effects which are paramount at high frequencies. We define the spectral densities of phase space angular momentum, heat transfer and cross power, which can serve as criteria for detailed balance violation. We confirm our theory with measurements in the 4-8 GHz frequency range on several two port circuits of varying symmetries, in space and time. This validates our approach, which will allow to treat quantum circuits at ultra-low temperature.

Published
2022
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6. Fluctuation-Dissipation in Thermoelectrics

Author

Tran, Ngoc Anh Minh, Dutt, Aditya Savitha, Pulumati, Nithin Bharadwaj, Reith, Heiko, Hu, Anjun, Dumont, Alexandre, Nielsch, Kornelius, Tremblay, André-Marie, Schierning, Gabi, Reulet, Bertrand, and Szkopek, Thomas

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Statistical Mechanics
Abstract

Thermoelectric materials exhibit correlated transport of charge and heat. The Johnson-Nyquist noise formula $ 4 k_B T R $ for spectral density of voltage fluctuations accounts for fluctuations associated solely with Ohmic dissipation. Applying the fluctuation-dissipation theorem, we generalize the Johnson-Nyquist formula for thermoelectrics, finding an enhanced voltage fluctuation spectral density $4 k_B T R (1 + ZT)$ at frequencies below a thermal cut-off frequency $f_T$, where $ZT$ is the dimensionless thermoelectric material figure of merit. The origin of the enhancement in voltage noise is thermoelectric coupling of temperature fluctuations. We use a wideband ($f_T\sim1$ kHz), integrated thermoelectric micro-device to experimentally confirm our findings. Measuring the $ZT$ enhanced voltage noise, we experimentally resolve temperature fluctuations with an amplitude of $0.8~\mu \mathrm{K} \mathrm{Hz}^{-1/2}$ at a mean temperature of 295 K. We find that thermoelectric devices can be used for thermometry with sufficient resolution to measure the fundamental temperature fluctuations described by the fluctuation-dissipation theorem.

Published
2022
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10. Postpartum hemorrhage care bundles to improve adherence to guidelines: A WHO technical consultation

Author

Althabe, Fernando, Therrien, Michelle NS, Pingray, Veronica, Hermida, Jorge, Gülmezoglu, Ahmet M, Armbruster, Deborah, Singh, Neelima, Guha, Moytrayee, Garg, Lorraine F, Souza, Joao P, Smith, Jeffrey M, Winikoff, Beverly, Thapa, Kusum, Hébert, Emmanuelle, Liljestrand, Jerker, Downe, Soo, Elorrio, Ezequiel Garcia, Arulkumaran, Sabaratnam, Byaruhanga, Emmanuel K, Lissauer, David M, Oguttu, Monica, Dumont, Alexandre, Escobar, Maria F, Fuchtner, Carlos, Lumbiganon, Pisake, Burke, Thomas F, and Miller, Suellen

Subjects
Reproductive Medicine, Biomedical and Clinical Sciences, Clinical Research, Pediatric, Good Health and Well Being, Female, Guideline Adherence, Humans, International Cooperation, Patient Care Bundles, Postpartum Hemorrhage, Pregnancy, World Health Organization, Aortic compression, Bimanual compression, Intrauterine balloon tamponade, Non-pneumatic antishock garment, Obstetric hemorrhage, Patient care bundles, Postpartum hemorrhage, Tranexamic acid, Uterotonics, Paediatrics and Reproductive Medicine, Obstetrics & Reproductive Medicine, Reproductive medicine
Abstract

ObjectiveTo systematically develop evidence-based bundles for care of postpartum hemorrhage (PPH).MethodsAn international technical consultation was conducted in 2017 to develop draft bundles of clinical interventions for PPH taken from the WHO's 2012 and 2017 PPH recommendations and based on the validated "GRADE Evidence-to-Decision" framework. Twenty-three global maternal-health experts participated in the development process, which was informed by a systematic literature search on bundle definitions, designs, and implementation experiences. Over a 6-month period, the expert panel met online and via teleconferences, culminating in a 2-day in-person meeting.ResultsThe consultation led to the definition of two care bundles for facility implementation. The "first response to PPH bundle" comprises uterotonics, isotonic crystalloids, tranexamic acid, and uterine massage. The "response to refractory PPH bundle" comprises compressive measures (aortic or bimanual uterine compression), the non-pneumatic antishock garment, and intrauterine balloon tamponade (IBT). Advocacy, training, teamwork, communication, and use of best clinical practices were defined as PPH bundle supporting elements.ConclusionFor the first response bundle, further research should assess its feasibility, acceptability, and effectiveness; and identify optimal implementation strategies. For the response to refractory bundle, further research should address pending controversies, including the operational definition of refractory PPH and effectiveness of IBT devices.

Published
2020

11. Survey of Mode of Delivery and Maternal and Perinatal Outcomes in Canada

Author

Andruschak, John, Dale, Sheryll, Der, Kenny, Pacheco, Terri, Vida, Karen, Frick, Corrine, Bott, Nancy, Carr, Lee-Ann, Bedard, Daniel, Robert, Nicole, Sprague, Ann, Berthiaume, Maryse, Beaudoin, Richard, Attenborough, Rebecca, Fahey, John, Gagnon, Irene, Murphy, Phil, Allen, Victoria, Bocking, Alan, Bottomley, Jim, Bujold, Emmanuel, Campbell, Karen, Christilaw, Jan, Crane, Joan, Dodds, Linda, Donner, Allan, Dumont, Alexandre, Dzakpasu, Susie, Forson, Abigail, Fraser, Bill, Gagnon, Anita, Joseph, K.S., Klein, Michael, Kramer, Michael, LaFrance, Martine, Lemay, Karine, Liu, Shiliang, Moutquin, Jean-Marie, Nimrod, Carl, Platt, Robert, O’Brien, Beverley, Ohlsson, Arne, Wen, Shi Wu, Gulmezoghu, Metin, Shah, Archana, Villar, Jose, Yang, Jie, Armson, B. Anthony, Carson, George D., da Silva, Orlando, Heaman, Maureen, Janssen, Patricia, Murphy, Phil A., Pasquier, Jean Charles, Sauve, Reg, Von Dadelszen, Peter, Walker, Mark, and Lee, Shoo K.

Published
2022
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17. Strategies for optimising early detection and obstetric first response management of postpartum haemorrhage at caesarean birth: a modified Delphi-based international expert consensus

Author

Pingray, Verónica, primary, Williams, Caitlin R, additional, Al-beity, Fadhlun M Alwy, additional, Abalos, Edgardo, additional, Arulkumaran, Sabaratnam, additional, Blumenfeld, Alejandro, additional, Carvalho, Brendan, additional, Deneux-Tharaux, Catherine, additional, Downe, Soo, additional, Dumont, Alexandre, additional, Escobar, Maria Fernanda, additional, Evans, Cherrie, additional, Fawcus, Sue, additional, Galadanci, Hadiza S, additional, Hoang, Diem-Tuyet Thi, additional, Hofmeyr, G Justus, additional, Homer, Caroline, additional, Lewis, Ayodele G, additional, Liabsuetrakul, Tippawan, additional, Lumbiganon, Pisake, additional, Main, Elliott K, additional, Maua, Judith, additional, Muriithi, Francis G, additional, Nabhan, Ashraf Fawzy, additional, Nunes, Inês, additional, Ortega, Vanesa, additional, Phan, Thuan N Q, additional, Qureshi, Zahida P, additional, Sosa, Claudio, additional, Varallo, John, additional, Weeks, Andrew D, additional, Widmer, Mariana, additional, Oladapo, Olufemi T, additional, Gallos, Ioannis, additional, Coomarasamy, Arri, additional, Miller, Suellen, additional, and Althabe, Fernando, additional

Published
2024
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19. Strategies for optimising early detection and obstetric first response management of postpartum haemorrhage at caesarean birth: a modified Delphi-based international expert consensus

Author

Pingray, Verónica, Williams, Caitlin R, Al-beity, Fadhlun M Alwy, Abalos, Edgardo, Arulkumaran, Sabaratnam, Blumenfeld, Alejandro, Carvalho, Brendan, Deneux-Tharaux, Catherine, Downe, Soo, Dumont, Alexandre, Escobar, Maria Fernanda, Evans, Cherrie, Fawcus, Sue, Galadanci, Hadiza S, Hoang, Diem-Tuyet Thi, Hofmeyr, G Justus, Homer, Caroline, Lewis, Ayodele G, Liabsuetrakul, Tippawan, Lumbiganon, Pisake, Main, Elliott K, Maua, Judith, Muriithi, Francis G, Nabhan, Ashraf Fawzy, Nunes, Inês, Ortega, Vanesa, Phan, Thuan N Q, Qureshi, Zahida P, Sosa, Claudio, Varallo, John, Weeks, Andrew D, Widmer, Mariana, Oladapo, Olufemi T, Gallos, Ioannis, Coomarasamy, Arri, Miller, Suellen, Althabe, Fernando, Pingray, Verónica, Williams, Caitlin R, Al-beity, Fadhlun M Alwy, Abalos, Edgardo, Arulkumaran, Sabaratnam, Blumenfeld, Alejandro, Carvalho, Brendan, Deneux-Tharaux, Catherine, Downe, Soo, Dumont, Alexandre, Escobar, Maria Fernanda, Evans, Cherrie, Fawcus, Sue, Galadanci, Hadiza S, Hoang, Diem-Tuyet Thi, Hofmeyr, G Justus, Homer, Caroline, Lewis, Ayodele G, Liabsuetrakul, Tippawan, Lumbiganon, Pisake, Main, Elliott K, Maua, Judith, Muriithi, Francis G, Nabhan, Ashraf Fawzy, Nunes, Inês, Ortega, Vanesa, Phan, Thuan N Q, Qureshi, Zahida P, Sosa, Claudio, Varallo, John, Weeks, Andrew D, Widmer, Mariana, Oladapo, Olufemi T, Gallos, Ioannis, Coomarasamy, Arri, Miller, Suellen, and Althabe, Fernando

Abstract

Objective There are no globally agreed on strategies on early detection and first response management of postpartum haemorrhage (PPH) during and after caesarean birth. Our study aimed to develop an international expert’s consensus on evidence-based approaches for early detection and obstetric first response management of PPH intraoperatively and postoperatively in caesarean birth. Design Systematic review and three-stage modified Delphi expert consensus. Setting International. Population Panel of 22 global experts in PPH with diverse backgrounds, and gender, professional and geographic balance. Outcome measures Agreement or disagreement on strategies for early detection and first response management of PPH at caesarean birth. Results Experts agreed that the same PPH definition should apply to both vaginal and caesarean birth. For the intraoperative phase, the experts agreed that early detection should be accomplished via quantitative blood loss measurement, complemented by monitoring the woman’s haemodynamic status; and that first response should be triggered once the woman loses at least 500 mL of blood with continued bleeding or when she exhibits clinical signs of haemodynamic instability, whichever occurs first. For the first response, experts agreed on immediate administration of uterotonics and tranexamic acid, examination to determine aetiology and rapid initiation of cause-specific responses. In the postoperative phase, the experts agreed that caesarean birth-related PPH should be detected primarily via frequently monitoring the woman’s haemodynamic status and clinical signs and symptoms of internal bleeding, supplemented by cumulative blood loss assessment performed quantitatively or by visual estimation. Postoperative first response was determined to require an individualised approach. Conclusion These agreed on proposed approaches could help improve the detection of PPH in the intraoperative and postoperative phases of caesarean birth and the first respons

Published
2024
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26. Implementing the QUALI-DEC project in Argentina, Burkina Faso, Thailand and Viet Nam: a process delineation and theory-driven process evaluation protocol

Author

Cleeve, Amanda, primary, Annerstedt, Kristi Sidney, additional, Betrán, Ana Pilar, additional, Mölsted Alvesson, Helle, additional, Kaboré Wendyam, Charles, additional, Carroli, Guillermo, additional, Lumbiganon, Pisake, additional, Nhu Hung, Mac Quoc, additional, Zamboni, Karen, additional, Opiyo, Newton, additional, Bohren, Meghan A., additional, El Halabi, Soha, additional, Gialdini, Celina, additional, Vila Ortiz, Mercedes, additional, Escuriet, Ramón, additional, Robson, Michael, additional, Dumont, Alexandre, additional, and Hanson, Claudia, additional

Published
2023
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28. A Framework Proposal for Quality and Safety Measurement in Gynecologic Emergency Care

Author

Fauconnier, Arnaud, Provot, Johan, Le Creff, Isabelle, Boulkedid, Rym, Vendittelli, Françoise, Doret-Dion, Muriel, Sroussi, Jérémy, Giraudet, Géraldine, Jacobs, Romain, Bourret, Antoine, Bauville, Estelle, Carvalho, Solenn, Tourette, Claire, Koskas, Martin, Akladios, Chérif, Nisolle, Michelle, Lejeune, Christophe, Huchon, Cyrille, Alberti, Corinne, Dumont, Alexandre, and Bouvier-Colle, Marie-Hélène

Published
2020
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29. Determinants of behaviors influencing implementation of maternal and perinatal death surveillance and response in low‐ and middle‐income countries: A systematic review of qualitative studies

Author

Willcox, Merlin L., primary, Okello, Immaculate A., additional, Maidwell‐Smith, Alice, additional, Tura, Abera Kenay, additional, van den Akker, Thomas, additional, Knight, Marian, additional, Dumont, Alexandre, additional, and Muller, Ingrid, additional

Published
2023
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35. Caesarean section or Vaginal birth: Making an Informed Choice

Author

Dugas, Marylène, De Loenzien, Myriam, Dumont, Alexandre, and Shorten, Allison

Subjects
parasitic diseases, QUALI-DEC project, mode of birth, caesarean delivery, preferences, shared decision making, reproductive and urinary physiology
Abstract

Women’s fear and uncertainty about vaginal deliveryand lack of empowerment in decision-making generate decision conflict and the overuse ofcaesareansectionsin low- and middle-income countries (LMICs). This decision analysis tool(DAT) aims to help pregnant women make an informed choice about the planned mode of deliveryin Vietnam, Thailand, Argentina, and Burkina Faso.The DAT targets low-risk pregnant women with a healthy, singleton foetus, without any medical or obstetric disorder, no previous caesarean scarring, and eligibility for labour trials.

Published
2023
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37. VerChor: A Framework for Verifying Choreographies

Author

Güdemann, Matthias, Poizat, Pascal, Salaün, Gwen, Dumont, Alexandre, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Cortellessa, Vittorio, editor, and Varró, Dániel, editor

Published
2013
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46. APPROPRIATE USE OF CAESAREAN SECTION THROUGH QUALITY DECISION-MAKING BY WOMEN AND PROVIDERS

Author

Dumont, Alexandre, Centre population et développement (CEPED - UMR_D 196), Institut de Recherche pour le Développement (IRD)-Université Paris Cité (UPCité), and Institut de recherche pour le développement (IRD)

Subjects
[SDV]Life Sciences [q-bio], caesarean section, decision making, non clinical interventions
Abstract

Technical report of the QUALI-DEC project for the periodfrom 01/01/2020 to 30/06/2021

Published
2022
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48. Combined incentive actions, focusing on primary care professionals, to improve cervical cancer screening in women living in socioeconomically disadvantaged geographical areas: a study protocol of a hybrid cluster randomised effectiveness and implementation trial- RESISTE

Author

Hassine, Amir, primary, Antoni, Guillemette, additional, Fender, Muriel, additional, Slama, Katia, additional, Léandri, François-Xavier, additional, Fanon, Jean-Luc, additional, Auvray, Christelle, additional, Jaffar Bandjee, Marie Christine, additional, Traversier, Nicolas, additional, Fagour, Laurence, additional, Rochaix, Lise, additional, Fiorina, Camilla, additional, Pourette, Dolorès, additional, Opigez, Eric, additional, Dumont, Alexandre, additional, Bardou, Marc, additional, and Study Group, Resiste, additional

Published
2022
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