4 results on '"Pierre Mallet"'
Search Results
2. Patterns of adaptive servo-ventilation settings in a real-life multicenter study: pay attention to volume!
- Author
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Alain Palot, Stefania Redolfi, Arnaud Bourdin, Claudio Rabec, M. Georges, Carole Philippe, Erika Nogue, Dany Jaffuel, Jean-Pierre Mallet, Nicolas Molinari, Carey M. Suehs, Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Adhésion et Inflammation (LAI), Aix Marseille Université (AMU)-Assistance Publique - Hôpitaux de Marseille (APHM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Université de Montpellier (UM), Institut Montpelliérain Alexander Grothendieck (IMAG), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Physiologie & médecine expérimentale du Cœur et des Muscles [U 1046] (PhyMedExp), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Assistance Publique - Hôpitaux de Marseille (APHM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Université de Montpellier (UM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), and MORNET, Dominique
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Male ,Cardiac output ,030204 cardiovascular system & hematology ,[SDV.MHEP.PSR]Life Sciences [q-bio]/Human health and pathology/Pulmonology and respiratory tract ,Tidal volume ,0302 clinical medicine ,Lead (electronics) ,2. Zero hunger ,Sleep Apnea, Obstructive ,Ejection fraction ,Continuous Positive Airway Pressure ,Setting ,3. Good health ,embryonic structures ,Breathing ,Cardiology ,Female ,medicine.symptom ,medicine.medical_specialty ,animal structures ,Adaptive servo-ventilation ,03 medical and health sciences ,Sleep Apnea Syndromes ,Internal medicine ,Hyperventilation ,Pressure ,medicine ,Humans ,Sleep-disordered breathing ,Aged ,lcsh:RC705-779 ,business.industry ,Research ,lcsh:Diseases of the respiratory system ,Respiration, Artificial ,Sleepdisordered breathing ,Cardiopathy ,Cross-Sectional Studies ,030228 respiratory system ,[SDV.SPEE] Life Sciences [q-bio]/Santé publique et épidémiologie ,Cluster ,[SDV.MHEP.PSR] Life Sciences [q-bio]/Human health and pathology/Pulmonology and respiratory tract ,Minute volume ,[SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie ,Pulmonary Ventilation ,business ,Body mass index ,Respiratory minute volume ,Follow-Up Studies - Abstract
Backgrounds To explain the excess cardiovascular mortality observed in the SERVE-HF study, it was hypothesized that the high-pressure ASV default settings used lead to inappropriate ventilation, cascading negative consequences (i.e. not only pro-arrythmogenic effects through metabolic/electrolyte abnormalities, but also lower cardiac output). The aims of this study are: i) to describe ASV-settings for long-term ASV-populations in real-life conditions; ii) to describe the associated minute-ventilations (MV) and therapeutic pressures for servo-controlled-flow versus servo-controlled-volume devices (ASV-F Philips®-devices versus ASV-V ResMed®-devices). Methods The OTRLASV-study is a cross-sectional, 5-centre study including patients who underwent ASV-treatment for at least 1 year. The eight participating clinicians were free to adjust ASV settings, which were compared among i) initial diagnosed sleep-disordered-breathing (SBD) groups (Obstructive-Sleep-Apnea (OSA), Central-Sleep-Apnea (CSA), Treatment-Emergent-Central-Sleep-Apnea (TECSA)), and ii) unsupervised groups (k-means clusters). To generate these clusters, baseline and follow-up variables were used (age, sex, body mass index (BMI), initial diagnosed Obstructive-Apnea-Index, initial diagnosed Central-Apnea-Index, Continuous-Positive-Airway-Pressure used before ASV treatment, presence of cardiopathy, and presence of a reduced left-ventricular-ejection-fraction (LVEF)). ASV-data were collected using the manufacturer’s software for 6 months. Results One hundred seventy-seven patients (87.57% male) were analysed with a median (IQ25–75) initial Apnea-Hypopnea-Index of 50 (38–62)/h, an ASV-treatment duration of 2.88 (1.76–4.96) years, 61.58% treated with an ASV-V. SDB groups did not differ in ASV settings, MV or therapeutic pressures. In contrast, the five generated k-means clusters did (generally described as follows: (C1) male-TECSA-cardiopathy, (C2) male-mostly-CSA-cardiopathy, (C3) male-mostly-TECSA-no cardiopathy, (C4) female-mostly-elevated BMI-TECSA-cardiopathy, (C5) male-mostly-OSA-low-LVEF). Of note, the male-mostly-OSA-low-LVEF-cluster-5 had significantly lower fixed end-expiratory-airway-pressure (EPAP) settings versus C1 (p = 0.029) and C4 (p = 0.007). Auto-EPAP usage was higher in the male-mostly-TECSA-no cardiopathy-cluster-3 versus C1 (p = 0.006) and C2 (p p = 0.002) and ASV-V (p Conclusions Real-life ASV settings are associated with combinations of baseline and follow-up variables wherein cardiological variables remain clinically meaningful. At the patient level, a hyperventilation risk exists regardless of cluster or ASV-monitoring type, spotlighting a future role of MV-telemonitoring in the interest of patient-safety. Trial registration The OTRLASV study was registered on ClinicalTrials.gov (Identifier: NCT02429986). 1 April 2015.
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- 2020
3. Single photon emitters in exfoliated WSe2 structures
- Author
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Marek Potemski, Piotr Kossacki, Ashish Arora, V. Cherkez, Jean-Yves Veuillen, Maciej Koperski, K. Nogajewski, Jacques Marcus, Pierre Mallet, Laboratoire national des champs magnétiques intenses - Grenoble (LNCMI-G), Université Joseph Fourier - Grenoble 1 (UJF)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Nano-Electronique Quantique et Spectroscopie (QuNES), Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS), Automatisation et Caractérisation (AUTOCARAC), and Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )
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[PHYS]Physics [physics] ,Photon ,Materials science ,Thin layers ,Photon antibunching ,business.industry ,Band gap ,Biomedical Engineering ,Physics::Optics ,Bioengineering ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,chemistry.chemical_compound ,Semiconductor ,chemistry ,Quantum dot ,Tungsten diselenide ,Optoelectronics ,General Materials Science ,Emission spectrum ,Electrical and Electronic Engineering ,business ,ComputingMilieux_MISCELLANEOUS - Abstract
Single photon emitters can form at the interfaces between layers of WSe2. Crystal structure imperfections in solids often act as efficient carrier trapping centres, which, when suitably isolated, act as sources of single photon emission. The best known examples of such attractive imperfections are well-width or composition fluctuations in semiconductor heterostructures1,2 (resulting in the formation of quantum dots) and coloured centres in wide-bandgap materials such as diamond3,4,5. In the recently investigated thin films of layered compounds, the crystal imperfections may logically be expected to appear at the edges of commonly investigated few-layer flakes of these materials exfoliated on alien substrates. Here, we report comprehensive optical micro-spectroscopy studies of thin layers of tungsten diselenide (WSe2), a representative semiconducting dichalcogenide with a bandgap in the visible spectral range. At the edges of WSe2 flakes (transferred onto Si/SiO2 substrates) we discover centres that, at low temperatures, give rise to sharp emission lines (100 μeV linewidth). These narrow emission lines reveal the effect of photon antibunching, the unambiguous attribute of single photon emitters. The optical response of these emitters is inherently linked to the two-dimensional properties of the WSe2 monolayer, as they both give rise to luminescence in the same energy range, have nearly identical excitation spectra and have very similar, characteristically large Zeeman effects. With advances in the structural control of edge imperfections, thin films of WSe2 may provide added functionalities that are relevant for the domain of quantum optoelectronics.
- Published
- 2015
4. On the symmetry of the local DOS in HTSC: a variable temperature STS study
- Author
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Pierre Mallet, William Sacks, J. Klein, and Dimitri Roditchev
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Physics ,Condensed matter physics ,Pairing ,General Physics and Astronomy ,Anisotropy ,Spectroscopy ,Symmetry (physics) ,Variable (mathematics) - Abstract
The anisotropy of the order parameter in HTSC is a key question on the way to understanding the nature of pairing. A systematic study of the local DOS in monocrystals of BiSrCaCuO and YBaCuO is performed with the help of STM/STS (2.5–90K). The analysis of the data shows that for most of the existing results the “real” LDOS is strongly modified by a number of parasitic effects. However, rather precise spectroscopy may be performed when real metal-vacuum-superconductor junctions are achieved. In such a case, for BiSrCaCuO, the total number of states is conserved, and no slope in the LDOS outside the gap is found. The shape of the LDOS obtained in YBaCuO is different from that of BiSrCaCuO. The pairing anisotropy and the influence of parasitic effects are discussed.
- Published
- 1996
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