15 results on '"Deike, L."'
Search Results
2. A dynamic wall modeling approach for large eddy simulation of offshore wind farms in realistic oceanic conditions
- Author
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Aiyer, A. K., primary, Deike, L., additional, and Mueller, M. E., additional
- Published
- 2024
- Full Text
- View/download PDF
3. The effects of surfactants on plunging breakers
- Author
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Erinin, M.A., primary, Liu, C., additional, Liu, X., additional, Mostert, W., additional, Deike, L., additional, and Duncan, J.H., additional
- Published
- 2023
- Full Text
- View/download PDF
4. Water droplet properties in microgravity conditions
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Graziani, C., Nespoulous, M., Denoyel, R., Fauve, S., Chauveau, C., Deike, L., Antoni, M., Matériaux divisés, interfaces, réactivité, électrochimie (MADIREL), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS - CNRS), Department of Mechanical and Aerospace Engineering [Princeton] (MAE), Princeton University, and GDR 2799 Micropesanteur Fondamentale & Appliquée
- Subjects
droplets ,Von Karman swirling flow ,[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment ,microgravity - Abstract
International audience; The temporal and spatial evolution of dispersed media is a fundamental problem in a widerange of physicochemical systems, such as emulsions, suspensions or aerosols. These systems are multiphasic and involve compounds of different densities. They are therefore subject to the influence of gravity which determines the sedimentation rate of their dispersed phase. This effect can be dominant and prevent a detailed study of the phenomena occurring between the constituents themselves, such as the coalescence of drops in emulsions, the evaporation of droplets or the flocculation in suspensions. In this context, the Centre National d'Etudes Spatiales (CNES) has recently supported the development of a new instrument to produce populations of droplets, a few micrometers in radius, under controlled conditions with the objective of allowing a detailed study of their properties in microgravity conditions. The principle of this instrument is to generate, by a fast compression/expansion of air, populations of water droplets and to track their evolution by optical scanning tomography in transmission mode within a volume of approximately 2 mm3. Parabolic flight experiments have shown the possibility to generate and accurately follow the evolution of populations of several hundred droplets for more than 20 seconds. The first experimental results show that it is possible to study their evaporation kinetics or their motion when imposing Von Karman swirling flows to air. This work is part of the AEROSOL project of DECLIC-EVO supported by CNES and aims to help the understanding of cloud microphysics which remains a critical open problem in the context of global warming.
- Published
- 2023
5. About aerosol properties in microgravity conditions
- Author
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Graziani, C., Nespoulous, M., Denoyel, R., Fauve, S., Chauveau, C., Deike, L., Antoni, M., Matériaux divisés, interfaces, réactivité, électrochimie (MADIREL), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Statistique de l'ENS (LPS), Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS - CNRS), Department of Mechanical and Aerospace Engineering [Princeton] (MAE), Princeton University, High Meadows Environmental Institute (HMEI), CNES, The Japanese Society for Multiphase Flow, The Virtual International Research Institute of Two-Phase Flow and Heat Transfer, and GDR 2799 Micropesanteur Fondamentale & Appliquée
- Subjects
[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment ,Evaporation & Condensation ,Microgravity ,Aerosol - Abstract
International audience; The temporal and spatial evolution of dispersed media is a fundamental problem in a wide range of physico-chemical systems, such as emulsions, suspensions or aerosols. These systems are multiphasic and involve compounds of different densities. They are therefore sensitive to buoyancy which determine s the rate of sedimentation of the dispersed phase . The latter usually prevent s a detailed study of the phenomena occurring between the constituents of aerosols , such as coalescence and evaporation of drops or flocculation of fine particles . The idea of this work is to generate with a fast compression/expansion of air, populations of water drop let s and to track their evolution by optical scanning tomography in transmission mode. Parabolic flights experiments have shown the possibility to generate and accurately follow the evolution of several hundred droplets for more than 20 seconds of microgravity within a 2 mm 3 volume . First results show that it is possible to study their evaporation kinetics as well as their motion when moving in a Von Karman swirling flow. This work is part of the AEROSOL project of DECLIC EVO supported by CNES and aims to help the understanding of cloud microphysics which remains a critical open problem in the context of global warming.
- Published
- 2023
6. A Mechanistic Sea Spray Generation Function Based on the Sea State and the Physics of Bubble Bursting
- Author
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Deike, L., primary, Reichl, B. G., additional, and Paulot, F., additional
- Published
- 2022
- Full Text
- View/download PDF
7. Velocity and size quantification of drops in single and collective bursting bubbles experiments
- Author
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Néel, B., primary and Deike, L., additional
- Published
- 2022
- Full Text
- View/download PDF
8. About water droplet populations in microgravity conditions
- Author
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Graziani, C., Nespoulous, M., Denoyel, R., Fauve, S., Chauveau, C., Deike, L., Antoni, M., Matériaux divisés, interfaces, réactivité, électrochimie (MADIREL), Aix Marseille Université (AMU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique de l'ENS - ENS Paris (LPENS), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Département de Physique de l'ENS-PSL, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut des Sciences de l'Ingénierie et des Systèmes (INSIS - CNRS), Department of Mechanical and Aerospace Engineering [Princeton] (MAE), Princeton University, High Meadows Environmental Institute (HMEI), ELGRA, and GDR 2799 Micropesanteur Fondamentale & Appliquée
- Subjects
[SPI.FLUID]Engineering Sciences [physics]/Reactive fluid environment - Abstract
International audience; Aerosols are divided systems in which liquid and/or solid particles evolve in a continuous gas phase. They are naturally subject to the influence of gravity, which determines the settling speed of the particles they contain. Aerosols have many applications in the pharmaceutical and cosmetic industries (inhalers, sprays), in metallurgy (spray drying) and in agriculture (pesticides). From an academic point of view, they are the subject of intense research activity. The description of their evolution is, for example, a major issue in climatology. With global warming, more water is evaporatingin the air resulting in more cloud formation and a higher importance of cloud microphysics in the understanding of the climate evolution. In this context, CNES has recently supported the development of a new instrument allowing not only to produce aerosols under controlled thermodynamicconditions but also to follow their evolution in microgravity. This work presents results of parabolic flight experiments. It demonstrates the possibility of producing aerosols and to investigate their properties with optical microscopy for periods of about twenty seconds.
- Published
- 2022
9. Speed and Acceleration of Droplets Generated by Breaking Wind‐Forced Waves
- Author
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Erinin, M. A., primary, Néel, B., additional, Ruth, D. J., additional, Mazzatenta, M., additional, Jaquette, R. D., additional, Veron, F., additional, and Deike, L., additional
- Published
- 2022
- Full Text
- View/download PDF
10. High-resolution direct simulation of deep water breaking waves: transition to turbulence, bubbles and droplets production
- Author
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Mostert, W., primary, Popinet, S., additional, and Deike, L., additional
- Published
- 2022
- Full Text
- View/download PDF
11. A wall-modeled approach accounting for wave stress in Large Eddy Simulations of offshore wind farms
- Author
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Aiyer, A K, primary, Deike, L, additional, and Mueller, M E, additional
- Published
- 2022
- Full Text
- View/download PDF
12. Effectiveness of Electroconvulsive Therapy in Functional Neurological Disorders: A Case Report.
- Author
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Paz-Otero MDP and Gallego Deike L
- Subjects
- Adult, Female, Humans, Treatment Outcome, Electroconvulsive Therapy methods, Conversion Disorder complications, Conversion Disorder therapy, Depressive Disorder, Major complications, Depressive Disorder, Major therapy, Dystonia complications, Dystonia therapy
- Abstract
Electroconvulsive therapy is a type of therapy frequently used in psychiatric clinical practice. Although it is generally used for the treatment of affective disorders or severe and/or resistant psychotic disorders, it has also demonstrated its usefulness in many other neuropsychiatric conditions. We present the case of a 26-year-old woman, previously diagnosed with a functional neurological disorder-with fixed dystonia phenotype in the right upper limb-, admitted to our hospital for a severe depressive episode. After noting the absence of clinical improvement with psychopharmacological treatment, it was decided to give electroconvulsive therapy, receiving a total of 11 sessions, 9 of which were effective, with bifrontotemporal application, three times a week. The patient experienced a significant improvement, not only at an affective and behavioral level, but also in the dystonia, recovering most of the mobility in the right hand and completely relinquishing the pain. Although scientific evidence is scarce regarding the use of electroconvulsive therapy in functional neurological disorders, this clinical case supports the existing literature and raises this therapy as a possibility in resistant and comorbid conditions with severe affective disorders.
- Published
- 2024
- Full Text
- View/download PDF
13. Ocean emission of microplastic.
- Author
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Shaw DB, Li Q, Nunes JK, and Deike L
- Abstract
Microplastics are globally ubiquitous in marine environments, and their concentration is expected to continue rising at significant rates as a result of human activity. They present a major ecological problem with well-documented environmental harm. Sea spray from bubble bursting can transport salt and biological material from the ocean into the atmosphere, and there is a need to quantify the amount of microplastic that can be emitted from the ocean by this mechanism. We present a mechanistic study of bursting bubbles transporting microplastics. We demonstrate and quantify that jet drops are efficient at emitting microplastics up to 280 μ m in diameter and are thus expected to dominate the emitted mass of microplastic. The results are integrated to provide a global microplastic emission model which depends on bubble scavenging and bursting physics; local wind and sea state; and oceanic microplastic concentration. We test multiple possible microplastic concentration maps to find annual emissions ranging from 0.02 to 7.4-with a best guess of 0.1-mega metric tons per year and demonstrate that while we significantly reduce the uncertainty associated with the bursting physics, the limited knowledge and measurements on the mass concentration and size distribution of microplastic at the ocean surface leaves large uncertainties on the amount of microplastic ejected., (© The Author(s) 2023. Published by Oxford University Press on behalf of National Academy of Sciences.)
- Published
- 2023
- Full Text
- View/download PDF
14. Combatting Social Isolation, Anxiety, and Loneliness in Hospitalized Patients: A Quasi-Experimental Study.
- Author
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Keen A, Deike L, and Haan J
- Subjects
- Adult, Humans, Anxiety prevention & control, Loneliness, Social Isolation
- Abstract
Objective: The objective of this study was to determine the effectiveness of an intervention related to social isolation and loneliness among hospitalized patients by improving: 1) social connectedness; 2) anxiety; and 3) loneliness and to evaluate experiences of the connection intervention., Background: Social isolation and loneliness can lead to detrimental effects on morbidity/mortality and health indices. A connection intervention was developed by investigators using key strategies to promote connectedness, providing in-person contact for hospitalized patients to meet individual and self-care needs., Methods: This quasi-experimental study was conducted in a Midwest adult academic health center. Social connectedness, anxiety, and loneliness were evaluated at baseline and postintervention using a paired-sample t test. Experience responses were analyzed using content analysis., Results: There were no significant differences in social connectedness, anxiety, or loneliness when comparing baseline with postintervention. Experience themes included sharing personal stories back and forth, treating me as a person, mitigating loneliness, and finding benefit., Conclusion: Despite nonsignificant findings, participants found benefit in filling the social void of being an inpatient. Clinicians should ensure that holistic care is delivered to hospitalized inpatients. Inclusive patient-centered strategies targeted to decrease social isolation and loneliness among acute care inpatients should continue to be developed and tested., Competing Interests: The authors declare no conflicts of interest., (Copyright © 2023 Wolters Kluwer Health, Inc. All rights reserved.)
- Published
- 2023
- Full Text
- View/download PDF
15. Bubbles spray aerosols: Certitudes and mysteries.
- Author
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Villermaux E, Wang X, and Deike L
- Abstract
Ocean spray aerosol formed by bubble bursting are at the core of a broad range of atmospheric processes: they are efficient cloud condensation nuclei and carry a variety of chemical, biological, and biomass material from the surface of the ocean to the atmosphere. The origin and composition of these aerosols is sensibly controlled by the detailed fluid mechanics of bubble bursting. This perspective summarizes our present-day knowledge on how bursting bubbles at the surface of a liquid pool contribute to its fragmentation, namely to the formation of droplets stripped from the pool, and associated mechanisms. In particular, we describe bounds and yields for each distinct mechanism, and the way they are sensitive to the bubble production and environmental conditions. We also underline the consequences of each mechanism on some of the many air-sea interactions phenomena identified to date. Attention is specifically payed at delimiting the known from the unknown and the certitudes from the speculations., (© The Author(s) 2022. Published by Oxford University Press on behalf of the National Academy of Sciences.)
- Published
- 2022
- Full Text
- View/download PDF
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