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1صورة
المؤلفون: Dan Powell
مصطلحات موضوعية: Defence studies, Ceramic armour, interlayers, Interfaces, wave propagation, ballistic impact, DSDS23, DSDS23 Poster
الوصف: Poster contribution to the Defence and Security Doctoral Symposium 2023
الإتاحة: https://doi.org/10.17862/cranfield.rd.25041251.v1Test
https://figshare.com/articles/poster/Critical_interlayers_and_interfaces_in_ceramic_armour_systems/25041251Test -
2صورة
المؤلفون: Powell, Dan
مصطلحات موضوعية: Ceramic armour, interlayers, Interfaces, wave propagation, ballistic impact, DSDS23, DSDS23 Poster
الوصف: Poster contribution to the Defence and Security Doctoral Symposium 2023 ; RBSL
العلاقة: Powell, Dan (2024). Critical interlayers and interfaces in ceramic armour systems. Cranfield Online Research Data (CORD). Poster. https://doi.org/10.17862/cranfield.rd.25041251.v1Test; https://doi.org/10.17862/cranfield.rd.25041251.v1Test; https://dspace.lib.cranfield.ac.uk/handle/1826/21341Test
الإتاحة: https://doi.org/10.17862/cranfield.rd.25041251.v1Test
https://dspace.lib.cranfield.ac.uk/handle/1826/21341Test -
3مؤتمر
المؤلفون: Talatizi, Adrien, Bernacki, Marc
المساهمون: Centre de Mise en Forme des Matériaux (CEMEF), Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Chaire RealIMotion, ANR-22-CHIN-0003,RealIMotion,Matériaux virtuels - Une réalité industrielle en mouvement(2022)
المصدر: 14th International Conference on the Technology of Plasticity
https://hal.science/hal-04353595Test
14th International Conference on the Technology of Plasticity, Sep 2023, Cannes - Mandelieu-La-Napoule, Franceمصطلحات موضوعية: Numerical simulation, Polycrystalline Materials, Wave Propagation, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, [SPI.MAT]Engineering Sciences [physics]/Materials
جغرافية الموضوع: Cannes - Mandelieu-La-Napoule, France
الوصف: International audience ; During the manufacture processes of their critical parts, industrials use non destructive techniques to ensure the quality of their products. Among those, ultrasonic testing is a widespread method. However, structure borne noise remains a complex problem for results interpretation during ultrasonic testing. Therefore, it is a matter of interest to improve our understanding of the propagation of ultrasonic waves in polycrystalline materials. The use of mean field and statistical models and are well known and the recent increasing of computing capabilities (due to hardware enhancement and HPC methods) allows today more realistic computations. In this context, we propose to develop a high fidelity tool that can simulate the propagation of ultrasonic waves polycrystalline materials taking into account the complexity of their characteristics. To do so, we apply different finite element methods on realistic microstructures generated with Laguerre-Voronoı̈ tesselations and 2D/3D reconstructions from EBSD data. The solved PDEs are based on the Momentum Balance Equation and the Stress-Strain relation.
العلاقة: hal-04353595; https://hal.science/hal-04353595Test
الإتاحة: https://hal.science/hal-04353595Test
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4صورة
المؤلفون: Miroslav Hanzelka, Wen Li, Qianli Ma, Murong Qin, Xiao-Chen Shen, Luisa Capannolo, Longzhi Gan
مصطلحات موضوعية: Stellar Astronomy, Cosmology, Astrophysics, Planetary Science, Solar System, Solar Physics, Planets and Exoplanets, Space Science, High Energy Astrophysics, Cosmic Rays, Space and Solar Physics, Astronomical and Space Sciences not elsewhere classified, EMIC waves, wave propagation properties, full-wave simulation, mode conversion, ducted waves, reflected waves, cold plasma, Earth’s inner magnetosphere Frontiers
الوصف: Electromagnetic ion cyclotron (EMIC) waves can scatter radiation belt electrons with energies of a few hundred keV and higher. To accurately predict this scattering and the resulting precipitation of these relativistic electrons on short time scales, we need detailed knowledge of the wave field’s spatio-temporal evolution, which cannot be obtained from single spacecraft measurements. Our study presents EMIC wave models obtained from two-dimensional (2D) finite-difference time-domain (FDTD) simulations in the Earth’s dipole magnetic field. We study cases of hydrogen band and helium band wave propagation, rising-tone emissions, packets with amplitude modulations, and ducted waves. We analyze the wave propagation properties in the time domain, enabling comparison with in situ observations. We show that cold plasma density gradients can keep the wave vector quasiparallel, guide the wave energy efficiently, and have a profound effect on mode conversion and reflections. The wave normal angle of unducted waves increases rapidly with latitude, resulting in reflection on the ion hybrid frequency, which prohibits propagation to low altitudes. The modeled wave fields can serve as an input for test-particle analysis of scattering and precipitation of relativistic electrons and energetic ions.
الإتاحة: https://doi.org/10.3389/fspas.2023.1251563.s001Test
https://figshare.com/articles/figure/Image1_Full-wave_modeling_of_EMIC_wave_packets_ducted_propagation_and_reflected_waves_PDF/24277708Test -
5رسالة جامعية
المؤلفون: Lai, Ssu-Ting
المساهمون: Université Paris Cité, Fuji, Nobuaki, Bonilla, Luis Fabián
مصطلحات موضوعية: Modélisation numérique, Propagation des ondes, Mécanique des roches, Expérience en laboratoire, Nucléation sismique, Supervision, Méthode des éléments spectraux, Inversion de forme d'onde, Déformation des roches, Numerical modelling, Wave propagation, Rock mechanics, Laboratory experiment, Earthquake nucleation, Monitoring, Spectral element method, Waveform inversion, Rock deformation
الوصف: La supervision microscopique et macroscopique de l'évolution de la rupture est un élément clé pour nous aider à comprendre l'état des contraintes et les caractéristiques sismiques. À l'échelle microscopique, la mesure des propriétés des roches sous déformation en laboratoire nous fournit une vue globale des caractéristiques dynamiques et statistiques d'une roche. À l'aide ainsi de l'observation macroscopique, les expériences de déformation des roches à l'échelle du laboratoire nous ont apporté les connaissances essentielles pour comprendre la physique de la nucléation des séismes. La compréhension de l'évolution des fissures est également importante dans l'industrie pour surveiller le stockage des hydrocarbures et du CO2, puisque leur injection souterraine dans les réservoirs déclenche des ruptures de failles sismiques. Par conséquent, l'imagerie des scénarios de stockage time-lapse, l'étude de la sensibilité de la réponse sismique et l'investigation du processus de rupture devienneront indispensables dans l'industrie et la physique des séismes. Cette thèse propose une méthodologie d'imagerie sismique de l'état de l'art utilisant l'équation des ondes pour caractériser les changements structurels pendant la déformation de la roche. Nous avons donc développé une stratégie d'imagerie 0D et 3D time-lapse (4D) des données des expériences sismiques-actives à l'échelle du laboratoire, en proposant une méthode d'inversion pour imager efficacement les changements structurels élastiques/anélastiques pendant la déformation. Nous combinons d'abord les données observées pendant des expériences statiques et le données synthétiques pour calibrer les signaux enregistrés. Puis, nous déterminons les propriétés des ondes qui se propagent dans les échantillons. Ensuite, nous obtenons des informations sur l'hétérogénéité et l'anisotropie 3D des roches en comparant les formes d'onde observées et les synthétiques. Enfin, les méthodes d'inversion de formes d'onde et d'imagerie de migration pour les sources actives sont mises en œuvre ...
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6صورة
المؤلفون: Santu Das (11889482)
مصطلحات موضوعية: Applied Mathematics not elsewhere classified, ocean, Complex media, Wave propagation
الوصف: Graphical representation of wave dissipation in a compressed sea ice
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7صورة
المؤلفون: Rupamanjari Majumder (128411), Sayedeh Hussaini (11540005), Vladimir S. Zykov (11540008), Stefan Luther (5922638), Eberhard Bodenschatz (102620)
مصطلحات موضوعية: Biochemistry, Medicine, Cell Biology, Physiology, Biotechnology, Evolutionary Biology, Mathematical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, Information Systems not elsewhere classified, threshold illumination régime, spatially extended medium, lesser studied sub, lethal rhythm disorders, human atrial tissue, cardiac arrhythmia research, nonlinear wave propagation, div >< p, cardiac arrhythmias requires, wave break initiation, cardiac tissue, cardiac rhythm, wave break, called arrhythmias, wave profile, wave breaks, waveback interaction, sudden death, silico <, restitution characteristics, potentially life
الوصف: A. APD 90 and B CV restitution curves at E e = 0.085 mW/mm 2 (solid), E e = 0.09 mW/mm 2 (dashed) and E e = 0.092 mW/mm 2 (dot-dashed), for constant global illumination. C. Right propagating plane waves in a non-illuminated 512 × 10 pseudo-1D domain, paced electrically from the left boundary at 11.5 Hz. D. Wave block at the pacing site when the simulation in (C) is conducted in the presence of a uniform global time-periodic illumination (1.0 Hz, E e = 0.092 mW/mm 2 ). E. Wave block (indicated by green arrows) away from the influence of the spiral in 2D.
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8صورة
المؤلفون: Rupamanjari Majumder (128411), Sayedeh Hussaini (11540005), Vladimir S. Zykov (11540008), Stefan Luther (5922638), Eberhard Bodenschatz (102620)
مصطلحات موضوعية: Biochemistry, Medicine, Cell Biology, Physiology, Biotechnology, Evolutionary Biology, Mathematical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, Information Systems not elsewhere classified, threshold illumination régime, spatially extended medium, lesser studied sub, lethal rhythm disorders, human atrial tissue, cardiac arrhythmia research, nonlinear wave propagation, div >< p, cardiac arrhythmias requires, wave break initiation, cardiac tissue, cardiac rhythm, wave break, called arrhythmias, wave profile, wave breaks, waveback interaction, sudden death, silico <, restitution characteristics, potentially life
الوصف: A Intact spiral in the presence of uniform, global, constant illumination ( E e = 0.025 mW/mm 2 ). B Break up in the presence of periodic optical stimulation (0.025 mW/mm 2 , 4 Hz, PW = 200 ms).
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9صورة
المؤلفون: Rupamanjari Majumder (128411), Sayedeh Hussaini (11540005), Vladimir S. Zykov (11540008), Stefan Luther (5922638), Eberhard Bodenschatz (102620)
مصطلحات موضوعية: Biochemistry, Medicine, Cell Biology, Physiology, Biotechnology, Evolutionary Biology, Mathematical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, Information Systems not elsewhere classified, threshold illumination régime, spatially extended medium, lesser studied sub, lethal rhythm disorders, human atrial tissue, cardiac arrhythmia research, nonlinear wave propagation, div >< p, cardiac arrhythmias requires, wave break initiation, cardiac tissue, cardiac rhythm, wave break, called arrhythmias, wave profile, wave breaks, waveback interaction, sudden death, silico <, restitution characteristics, potentially life
الوصف: A-F. Spatial distribution of membrane voltage at different time points during (A-E, blue shaded) and after (F, non-shaded) one illumination cycle. The dashed white lines indicate the trajectories of the phase singularities (PS1, PS2 and PS3, shown in A), as they evolve since the preceding time point. Here, we highlight the spatiotemporal evolution of PS2. The hypocycloidal pattern of evolution of PS2 represents the dynamics of PS2 prior to the application of light. The filled yellow, green, cyan, blue, violet and red circles in A-F indicate the positions of PS2 at 750 ms, 780 ms, 840 ms, 1000 s, 1260 s and 1280 s, respectively. The bold white lines mark the zones of conduction block at these particular time points. Absence of a dashed white line in F, together with a sharp increase in the repolarized area, relative to E, show that after removal of light in E the activity remains frozen for a brief period of time (here, 30 ms). This allows the excitable tissue to recover. G. Voltage time series recorded from five representative points within the domain, as marked on A with the pink, green, yellow, blue and cyan asterisk symbols.
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10صورة
المؤلفون: Rupamanjari Majumder (128411), Sayedeh Hussaini (11540005), Vladimir S. Zykov (11540008), Stefan Luther (5922638), Eberhard Bodenschatz (102620)
مصطلحات موضوعية: Biochemistry, Medicine, Cell Biology, Physiology, Biotechnology, Evolutionary Biology, Mathematical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, Information Systems not elsewhere classified, threshold illumination régime, spatially extended medium, lesser studied sub, lethal rhythm disorders, human atrial tissue, cardiac arrhythmia research, nonlinear wave propagation, div >< p, cardiac arrhythmias requires, wave break initiation, cardiac tissue, cardiac rhythm, wave break, called arrhythmias, wave profile, wave breaks, waveback interaction, sudden death, silico <, restitution characteristics, potentially life
الوصف: A-E Effect of applying a light pulse (filled yellow rectangle) (0.092 mW/mm 2 , 100 ms) to different phases of an action potential (AP). A 0 and A 1 refer to the APD 90 values of the unperturbed and perturbed AP, respectively. F Dependency of A 1 / A 0 on the percentage of repolarization of the cell membrane at the start of stimulation (for different PWs). G PW-dependence of the percentage repolarization, at the start of a stimulation that causes maximum increase (blue) or decrease (brown) in APD 90 . The dashed blue and brown lines on A correlate the findings in (G) to real values of the membrane voltage. The blue and brown arrows in A indicate where the light stimulus should be applied in order to achieve maximum increase or decrease in APD 90 , respectively.
