Bibliographies thématiques / Active particle

Littérature scientifique sur le sujet « Active particle »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Active particle"

Arkar, Kyaw, Mikhail M. Vasiliev, Oleg F. Petrov, Evgenii A. Kononov et Fedor M. Trukhachev. « Dynamics of Active Brownian Particles in Plasma ». Molecules 26, n^o 3 (21 janvier 2021) : 561. http://dx.doi.org/10.3390/molecules26030561.

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Experimental data on the active Brownian motion of single particles in the RF (radio-frequency) discharge plasma under the influence of thermophoretic force, induced by laser radiation, depending on the material and type of surface of the particle, are presented. Unlike passive Brownian particles, active Brownian particles, also known as micro-swimmers, move directionally. It was shown that different dust particles in gas discharge plasma can convert the energy of a surrounding medium (laser radiation) into the kinetic energy of motion. The movement of the active particle is a superposition of chaotic motion and self-propulsion.

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Datt, Charu, Giovanniantonio Natale, Savvas G. Hatzikiriakos et Gwynn J. Elfring. « An active particle in a complex fluid ». Journal of Fluid Mechanics 823 (23 juin 2017) : 675–88. http://dx.doi.org/10.1017/jfm.2017.353.

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In this work, we study active particles with prescribed surface velocities in non-Newtonian fluids. We employ the reciprocal theorem to obtain the velocity of an active spherical particle with an arbitrary axisymmetric slip velocity in an otherwise quiescent second-order fluid. We then determine how the motion of a diffusiophoretic Janus particle is affected by complex fluid rheology, namely viscoelasticity and shear-thinning viscosity, compared to a Newtonian fluid, assuming a fixed slip velocity. We find that a Janus particle may go faster or slower in a viscoelastic fluid, but is always slower in a shear-thinning fluid as compared to a Newtonian fluid.

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Speck, Thomas. « Collective forces in scalar active matter ». Soft Matter 16, n^o 11 (2020) : 2652–63. http://dx.doi.org/10.1039/d0sm00176g.

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Moran, Shannon E., Isaac R. Bruss, Philipp W. A. Schönhöfer et Sharon C. Glotzer. « Particle anisotropy tunes emergent behavior in active colloidal systems ». Soft Matter 18, n^o 5 (2022) : 1044–53. http://dx.doi.org/10.1039/d0sm00913j.

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Nourhani, Amir, Daniel Brown, Nicholas Pletzer et John G. Gibbs. « Engineering Contactless Particle-Particle Interactions in Active Microswimmers ». Advanced Materials 29, n^o 47 (2 novembre 2017) : 1703910. http://dx.doi.org/10.1002/adma.201703910.

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Cho, Durkhyun, Sanghoon Lee et Il Hong Suh. « Facial Feature Tracking Using Adaptive Particle Filter and Active Appearance Model ». Journal of Korea Robotics Society 8, n^o 2 (31 mai 2013) : 104–15. http://dx.doi.org/10.7746/jkros.2013.8.2.104.

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Gulin-Sarfraz, Tina, Jawad Sarfraz, Didem Şen Karaman Didem Şen Karaman, Jixi Zhang, Christina Oetken-Lindholm, Alain Duchanoy, Jessica M. Rosenholm et Daniel Abankwa. « FRET-reporter nanoparticles to monitor redox-induced intracellular delivery of active compounds ». RSC Adv. 4, n^o 32 (2014) : 16429–37. http://dx.doi.org/10.1039/c4ra00270a.

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FRET-reporter particles for redox-induced release of active compounds in cells were developed. This particle system allowed following the intracellular cleavage of delivered compounds after particle internalization.

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Steimel, Joshua P., Juan L. Aragones, Helen Hu, Naser Qureshi et Alfredo Alexander-Katz. « Emergent ultra–long-range interactions between active particles in hybrid active–inactive systems ». Proceedings of the National Academy of Sciences 113, n^o 17 (11 avril 2016) : 4652–57. http://dx.doi.org/10.1073/pnas.1520481113.

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Particle–particle interactions determine the state of a system. Control over the range of such interactions as well as their magnitude has been an active area of research for decades due to the fundamental challenges it poses in science and technology. Very recently, effective interactions between active particles have gathered much attention as they can lead to out-of-equilibrium cooperative states such as flocking. Inspired by nature, where active living cells coexist with lifeless objects and structures, here we study the effective interactions that appear in systems composed of active and passive mixtures of colloids. Our systems are 2D colloidal monolayers composed primarily of passive (inactive) colloids, and a very small fraction of active (spinning) ferromagnetic colloids. We find an emergent ultra–long-range attractive interaction induced by the activity of the spinning particles and mediated by the elasticity of the passive medium. Interestingly, the appearance of such interaction depends on the spinning protocol and has a minimum actuation timescale below which no attraction is observed. Overall, these results clearly show that, in the presence of elastic components, active particles can interact across very long distances without any chemical modification of the environment. Such a mechanism might potentially be important for some biological systems and can be harnessed for newer developments in synthetic active soft materials.

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Zhang, Ying-Nan, Qing-Ni Hu et Hong-Fei Teng. « Active target particle swarm optimization ». Concurrency and Computation : Practice and Experience 20, n^o 1 (2007) : 29–40. http://dx.doi.org/10.1002/cpe.1207.

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Orozco, Luisa Fernanda, Jean-Yves Delenne, Philippe Sornay et Farhang Radjai. « Effect of particle shape on particle breakage inside rotating cylinders ». EPJ Web of Conferences 249 (2021) : 07002. http://dx.doi.org/10.1051/epjconf/202124907002.

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We study the influence of particle shape on the evolution of particle breakage process taking place inside rotating cylinders. Extensive particle dynamics simulations taking into account the dynamics of the granular flow, particle breakage, and polygonal particle shapes were carried out. We find that the rate of particle breakage is faster in samples composed of initially rounder particles. The analysis of the active flowing layer thickness suggests that for samples composed of rounder particles a relatively lower dilatancy and higher connectivity lead to a less curved free surface profile. As a result, rounder particles rolling down the free surface have a higher mobility and thus higher velocities. In consequence, the faster breakage observed for rounder initial particles is due to the larger particles kinetic energy at the toe of the flow.

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Thèses sur le sujet "Active particle"

Obligado, Martín. « Fluid-particle interactions : from the simple pendulum to collective effects in turbulence ». Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI108/document.

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Cette thèse est organisée en deux parties. Après une brève introduction théorique (chapitre 1) et une discussion présentant la soufflerie du LEGI et des techniques expérimentales utilisées (chapitre 2), une première partie étudie les effets individuels des particules dans les écoulements tantôt laminaires et turbulents. Dans une seconde partie je me suis intéressé aux effets collectifs d’une population dense d’inclusions en interaction avec un champ turbulent.Dans le chapitre 3, nous montrons que l’équilibre d’un disque pendulaire faisant face à un écoulement présentant une vitesse moyenne présente un comportement bi-stable et hystérétique. Nous donnons une interprétation simple de ce comportement en termes d’une description par deux puits de potentiel, nécessitant uniquement de connaître la dépendance angulaire du coefficient de trainée normale d’une plaque statique inclinée. Nous étudions l’influence de la turbulence sur l’équilibre du pendule en général et sur la bi-stabilité observée en particulier.La dynamique des objets tractés dans un environnement fluide est d’intérêt pour de nombreuses situations pratiques. Les chapitres 4,5 et 6 concernent l’étude expérimentale de l’équilibre et de la stabilité de la trajectoire d’une sphère tractée à vitesse constante. Dans le chapitre 4, nous avons vu que le sillage d'une sphère peut produire un mouvement hélicoïdal d'une sphère remorqué par un fil. Nous avons constaté qu'il existe un nombre de Reynolds (défini avec le diamètre de la particule et la vitesse moyenne de l’écoulement) particulier pour activer cette motion instable. Une trajectoire en trois dimensions est reconstruite avec un dispositif expérimental extrêmement simple, utilisé pour la caractérisation de la forme de la trajectoire des particules. Dans le chapitre 5, nous étudions expérimentalement l'équilibre et la stabilité de la trajectoire d'une sphère remorqué à une vitesse constante dans la avec un rapport longueur - diamètre sans précédent. En ce chapitre, nous étudions les instabilités développées dans le fil pour un écoulement laminaire. Diffèrent types d’instabilités ont été trouvés dans cette expérience. Dans le chapitre 6, le même système est étudié, mais l'écoulement environnant est turbulent. Nous nous concentrons sur la comparaison entre la dynamique turbulente de la sphère tractée et d’une sphère librement advectèe. Nos résultats sont en accord avec un scénario de filtrage résultant du temps de réponse visqueuse d'une particule d'inertie dont la dynamique est couplée au fluide environnant par la force de traînée. Une caractéristique frappante des écoulements turbulents chargés de particules inertielles est la concentration préférentielle qui conduit à de très fortes hétérogénéités du champ de concentration en particules à différentes échelles. Les diagrammes de Voronoi ont été utilisés pour caractériser quantifier ce phénomène.En ce qui concerne les effets collectifs, trois écoulements différents ont été étudiés : bulles d’air (particules moins denses que le fluide, avec une taille de l’ordre de l´échelle de Kolmogorov) dans un canal a eau (chapitre 7), des particules solides légèrement plus denses que le fluide et diamètre supérieur à l´échelle de Kolmogorov dans une écoulement de von Kármán (chapitre 8) et gouttelettes d’eau dans la soufflerie (chapitre 9) ; de particules beaucoup plus denses que le fluide et diamètre inférieur à l’échelle de Kolmogorov. Enfin, nous proposons une nouvelle méthode de reconstruction des champs de concentration des particules dans les expériences par analogie avec le fonctionnement des caméras linéaire, et en exploitant l’hypothèse de Taylor dans la soufflerie. Cette nouvelle approche nous permet de reconstruire des champs de particules de plusieurs mètres de long. Ces champs permettent d’analyser la formation des superclusters. Nous montrons en effet que les clusters tendent eux-mêmes à s’organiser en superclusters (amas d’amas)
This PhD thesis covers many features of fluid-particle interactions, ranging from a simple pendulum inmersed in a flow to the presence of superclusters of water droplets in a wind tunnel.The simplest case studied was a pendulum with a pendulum-blob facing the wind in the wind-tunnel. As the pendulum-blob was a plate, the aerodynamic coefficients as a function of the angle between the plate and the streamwise velocity present a non-trivial behavior, resulting in an hysteresis cycle. We also investigate the influence of turbulence on the equilibrium of the pendulum in general and on the observed bi-stability in particular.Then, different instabilities of towed systems has been studied. In chapter 4 we have seen that the wake of a sphere can produce helicoidal motion of a sphere towed by a wire. We found that there exists a particle Reynolds number Rep threshold for activating this unstable motion. A three-dimensional trajectory was reconstructed with an extremely simple experimental setup, used for characterizing the shape of particle's trajectory. In chapter 5 we investigate experimentally the equilibrium and the stability of the trajectory of a sphere towed at constant velocity in the wind tunnel at the tip of a cable with unprecedented large length-to-diameter aspect ratio. In thist chapter we study the instabilities developped in the wire for a laminar flow.Flutter and divergence instabilities has been found in this experiment.In chapter 6 the same system is studied, but the surrounding flow is turbulent. In this chapter we focus on a comparison with this towed system with freely advected particles in turbulence. Our results are consistent with a filtering scenario resulting from the viscous response time of an inertial particle whose dynamics is coupled to the surrounding fluid via the dragforce.Therefore, depending on several parameters such as the Reynolds number of the particle, the wire or the fluctuations level of the flow, a whole family of instabilities can appear, with no trivial dependencies and important consequences considering different applications of such systems.Concerning the collective effects, three different flows have been studied: a water tunnel, a von Karman flow and a wind tunnel. A broad range of Reynolds numbers, dissipation scales and particles diameters and densities has been covered. Using Voronoi diagrams, we have quantified preferential concentration as a function of the Stokes number and the Reynolds number. In chapter 7 and 8 simultaneous PIV measurements complemented the inertial particles acquisitions. The goal was to analyze if the particles tend to stick into special regions of the flow.In the last chapter also DNS have been performed for comparing with experimental results. A sweep-stick mechanism, in which inertial particles tend to have the same statistics as zero-acceleration points has been proved to be consistent with our results.Finally, a promising new technique has been presented. Based on the standard measurements, a spatial field has been reconstructed allowing us to acquire a several meters long image of particles. The enormous amount of structures present in the image has evidenced that the clusters are grouped at the same time in bigger clusters (i.e. clusters form clusters, that we call superclusters). This new result is still being studied and presents a new and fascinating field for studying particle-flow interactions

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Gazuz, Igor. « Active and passive particle transport in dense colloidal suspensions ». [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-66299.

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Granick, Steve. « Surprises from single-particle imaging of passive and active diffusion ». Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-179310.

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Pullen, John. « Particle image velocimetry applied to waves with surface active films ». Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/12808.

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The technique of digital particle image velocimetry (DPIV) and the related technique of particle tracking velocimetry (PTV) are described. These techniques were extended and applied by the author to the study of surface active chemical films on the mechanics of capillary-gravity waves. The two custom-made facilities for these studies are described along with specialised image processing software developed by the author. Finally, results from a series of experiments are presented which detail the damping of wind waves by surface active films, measurements of wind induced surface drift and the alteration of surface particle trajectories. Results from all three experiments were compared with theoretical predictions.

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Granick, Steve. « Surprises from single-particle imaging of passive and active diffusion ». Diffusion fundamentals 20 (2013) 1, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A13521.

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Tarama, Mitsusuke. « Dynamics of active deformable particle - Two types of active spinning motions and dynamics in external flow field - ». 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199091.

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Deptuch, Grzegorz. « New Generation of Monolithic Active Pixel Sensors for Charged Particle Detection ». Université Louis Pasteur (Strasbourg) (1971-2008), 2002. http://www.theses.fr/2002STR13115.

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Hernandez, Jorge L. Yordan. « Kinetics of bubble-particle adhesion in flotation ». Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/91117.

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In order to study the role of electrical charge existing on air bubbles in the kinetics of the particle-bubble adhesion process in froth flotation, the zeta potential of microbubbles in the 40 -to 80-micron size range have been determined by means of a simple microelectrophoresis technique. In general, the bubble charge is determined by the charge of the polar head of the surfactants when ionic surfactants are used to produce bubbles. However, the magnitude of the zeta-potential is reduced when the surfactants are hydrolyzed. When using nonionic surfactants, the bubbles exhibit isoelectric points (i.e.p) in acidic and neutral pH ranges. It appears that the location of an i.e.p. is determined by the acid-base property of the surfactant molecule used. The negative charges observed with air bubbles and oil droplets in the absence of surfactants can be explained by the differences in the hydration energies of H⁺ and OH⁻ ions. An increase in the concentration of ionic surfactants results in an increase in bubble charge. However, the increase is minimal or non-existant when nonionic surfactants are used. The flotation chemistry of the quartz-amine system has been studied using an induction time apparatus constructed in the present work which has a sensitivity limit of 100-150 micro-seconds. The basic unit is similar to the one used by Eigeles and Volova (1960) and Trahar (1983), but it operates with a micro-computer and has a greater sensitivity. It has been found that at a given dodecyl ammonium hydrochloride concentration, the induction time is at a minimum at approximately pH 10.5. At this pH, the collector hydrolizes to form neutral amine and the flotation recovery reaches a maximum, suggesting that iono-molecular species are the surface-active species responsible for flotation. This finding confirms the earlier conclusions obtained using the surface tension (Somasundaran, 1976; Finch and Smith, 1973) and the contact angle (Smith, 1963) techniques. The induction time measurements have also been conducted as a function of particle size, collector concentration, indifferent electrolyte concentration and temperature. The results are compared with flotation data, bubble charge, particle charge and film thickness. Results of the induction time and microflctation experiments conducted using bubbles and particles of known electrical properties indicate that if the potential on the air/water interface is increase to a high value with the same sign as that of the s/l interface (e.g. by adding a suitable surfactant) the flotation kinetic is retarded; conversely, surfactant of the opposite sign can enhance the adhesion process.
M.S.

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Lubbe, Elizabeth Cornelia. « Influence of particle size on solubility of active pharmaceutical ingredients / E.C. Lubbe ». Thesis, North-West University, 2012. http://hdl.handle.net/10394/8763.

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The aqueous solubility of an active pharmaceutical ingredient (API) is an important property that requires evaluation during early development and prior to formulation of the final product. With general, experimental, solubility testing of different APIs, the question always arises as to whether particle size had been determined beforehand or not. All available literature suggests that particle size, for pharmaceutical powders, does not significantly affect equilibrium solubility. The dissolution rate will differ according to different particle sizes, but the overall results should be identical after equilibrium is established. This study was therefore planned to investigate as to whether different particle size fractions of the same API, dissolving at different rates, would all reach solubility equilibrium within 24 hours. Also, APIs from different solubility classes were investigated, because poorly soluble substances would most likely require a longer period of time to equilibrate. The time period of 24 hours was selected, because many published solubility studies report using that interval and is it the standard for our research group also. Available APIs were selected to determine the influence (if any) of particle size on their equilibrium solubilities and the time required for attaining that status. For the purpose of this investigation, five APIs were selected from compounds at our disposal in-house, ranging from freely soluble to poorly soluble in the order: chloroquine phosphate > pyrazinamide > mefloquine hydrochloride > closantel sodium > roxithromycin. Solubility studies were successfully completed on four of the five APIs selected. For closantel sodium, pyrazinamide and roxithromycin it was demonstrated that the 24 hour test period was sufficient for the attainment of equilibrium solubility, regardless of the particle size fractions tested. Surprisingly, the only API in this study for which 24 hours was an insufficient test period was mefloquine HCl, which was not the least soluble compound tested. Further testing would be required to clarify this anomaly. What was evident from the outcomes of this investigation was that although the ubiquitous 24 hour solubility test may work well in many cases, its suitability should be reviewed on a case-by-case basis and not just for the most poorly soluble compounds. Researchers testing solubility at temperatures lower than 37°C should be especially cautious of using a standardised test period, because equilibrium solubility would take longer to achieve with less energy available to the system.
Thesis (MSc (Pharmaceutics))--North-West University, Potchefstroom Campus, 2013

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Reichert, Julian [Verfasser], et Hartmut [Gutachter] Löwen. « Transport Coefficients in Dense Active Brownian Particle Systems / Julian Reichert ; Gutachter : Hartmut Löwen ». Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2021. http://d-nb.info/1227038607/34.

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Livres sur le sujet "Active particle"

A, Miller James. Final report for particle acceleration in active galactic nuclei : NASA grant NAG5-2871, period of performance : 1 Feb 1995 to 31 Jan 1996. [Washington, DC : National Aeronautics and Space Administration, 1996.

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Bellomo, Nicola, José Antonio Carrillo et Eitan Tadmor, dir. Active Particles, Volume 3. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93302-9.

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Bellomo, Nicola, Pierre Degond et Eitan Tadmor, dir. Active Particles, Volume 1. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49996-3.

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Bellomo, Nicola, Pierre Degond et Eitan Tadmor, dir. Active Particles, Volume 2. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20297-2.

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Colloidal Robotics : Autonomous propulsion and navigation of active particles. [New York, N.Y.?] : [publisher not identified], 2020.

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Hult, Arne. On the development of the present active participle in Bulgarian. Göteborg : Institutum Slavicum Universitatis Gothoburgensis, 1991.

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Brownian Agents and Active Particles : Collective dynamics in the natural and social sciences. Berlin : Springer, 2003.

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Browning [sic] agents and active particles : Collective dynamics in the natural and social sciences. 2^e éd. Berlin : Springer, 2007.

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Browning [sic] agents and active particles : Collective dynamics in the natural and social sciences. 2^e éd. Berlin : Springer, 2007.

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Krugli͡akov, P. M. Hydrophile-lipophile balance of surfactants and solid particles : Physicochemical aspects and applications. Amsterdam : Elsevier Science B. V., 2000.

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Chapitres de livres sur le sujet "Active particle"

Mestre, Francesc Sagués. « Particle-based Active Systems ». Dans Colloidal Active Matter, 23–70. Boca Raton : CRC Press, 2022. http://dx.doi.org/10.1201/9781003302292-3.

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Jabin, Pierre-Emmanuel, et Zhenfu Wang. « Mean Field Limit for Stochastic Particle Systems ». Dans Active Particles, Volume 1, 379–402. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49996-3_10.

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Herty, Michael, Lorenzo Pareschi et Sonja Steffensen. « Control Strategies for the Dynamics of Large Particle Systems ». Dans Active Particles, Volume 2, 149–71. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20297-2_5.

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Kuznetsov, Alexander, et Nickolay Mikheev. « Particle Dispersion in External Active Media ». Dans Springer Tracts in Modern Physics, 45–126. Berlin, Heidelberg : Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-36226-2_4.

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Lu, Zheng, Sami F. Masri et Xilin Lu. « Semi-active Control Particle Damping Technology ». Dans Particle Damping Technology Based Structural Control, 331–69. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-3499-7_9.

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Coleman, C. S. « Relativistic Particle Streams in AGN ». Dans Structure and Evolution of Active Galactic Nuclei, 521–23. Dordrecht : Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4562-3_40.

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Jin, Shi, et Lei Li. « Random Batch Methods for Classical and Quantum Interacting Particle Systems and Statistical Samplings ». Dans Active Particles, Volume 3, 153–200. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-93302-9_5.

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Baring, Matthew G. « Particle Acceleration in Turbulent Magnetohydrodynamic Shocks ». Dans Relativistic Jets from Active Galactic Nuclei, 245–95. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527641741.ch9.

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Pinches, Simon D., et Sergei E. Sharapov. « Energetic Particle Driven Modes ». Dans Active Control of Magneto-hydrodynamic Instabilities in Hot Plasmas, 305–21. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-44222-7_9.

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Protheroe, R. J., et A. P. Szabo. « High Energy Cosmic Rays from Cores of Active Galactic Nuclei ». Dans Particle Astrophysics and Cosmology, 43–51. Dordrecht : Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1707-4_5.

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Actes de conférences sur le sujet "Active particle"

Waddington, C. Jake, et Robert R. Clinton. « The C Shell, an active detector of UH nuclei ». Dans Particle astrophysics. AIP, 1990. http://dx.doi.org/10.1063/1.39171.

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von Lockette, Paris R., et Samuel E. Lofland. « Role of Magnetization Anisotropy in the Active Behavior of Magnetorheological Elastomers ». Dans ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5115.

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Magnetorheological elastomers (MREs) are a re-emerging class of smart materials whose novel behavior stems from their response to magnetic fields. Historically comprised of soft-magnetic carbonyl (spherical) iron particles embedded in highly compliant matrix materials, MRE research has focused on their apparent change in shear modulus (in excess of 60%) under a magnetic field. Recent work by the authors has departed from the experimental and theoretical focus on MREs made from soft-magnetic particles (S-MREs) to investigate MREs having hard-magnetic particle inclusions (H-MREs). While H-MRE materials do not perform well in dynamic shear stiffness applications when compared to the traditional S-MREs, H-MREs provide remotely powered, fully reversible actuation capabilities that S-MREs are unable to achieve. In addition, in the same dynamic shear stiffness applications these H-MREs provide a measure of active control of which S-MREs are also incapable. This work examines the role that particle magnetization, developed due to shape anisotropy, plays in the actuation response S-MREs in contrast to H-MREs. H-MRE response is predicated on the response of the hard-magnetic particles to the external magnetic field and to neighboring particles. Since hard-magnetic particles have an internal preferred magnetic orientation, they are able to generate torques at the particle level, T = M × B, where T is the torque density, M is the magnetization, and B is the local magnetic flux density. In contrast, soft-magnetic particles may develop an induced magnetization when exposed to an external field if the particles exhibit shape anisotropy. This induced magnetization is also capable of producing torque at the particle level, however, spherical particles like those historically used in MREs are geometrically isotropic and therefore do not develop induced magnetization either and consequently the widely studied MREs comprised of soft-magnetic spherical particles generate no torque at the particle level. Shape anisotropy further complicates the mechanical response by inducing Eshelby-type shape-dependent effects on the mechanical stresses developed local to the particle. These effects vary the local particle rotation, resulting from a given macroscopic loading, and in turn affect the local magnetic field by changing the particle’s magnetization axis with respect to the external field. The result is a material system whose elastomagnetic response depends on particle shape and orientation as well as on particle magnetization. In previous works the authors used barium hexaferrite (a hard magnetic material) and carbonyl iron powders to generate MRE materials having varying particle alignment and magnetization permutations. These materials were examined in cantilever bending modes to assess and differentiate their abilities as bending actuators. In this work, finite element studies mirroring the bending tests are performed to determine the role of particle/magnetization anisotropy on the behavior. Results show strong dependence on particle shape anisotropy.

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Schächter, Levi. « Particle dynamics in an active medium ». Dans ADVANCED ACCELERATOR CONCEPTS. ASCE, 1997. http://dx.doi.org/10.1063/1.53017.

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Lawandy, Nabil M. « Nano-particle plasmonics in active media ». Dans Optics & Photonics 2005, sous la direction de Martin W. McCall, Graeme Dewar et Mikhail A. Noginov. SPIE, 2005. http://dx.doi.org/10.1117/12.620971.

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Kuzikov, S. V., A. A. Vikharev, M. E. Plotkin, D. Yu Shegolkov, J. L. Hirshfield et V. P. Yakovlev. « One-channel, multi-mode active pulse compressor ». Dans 2007 IEEE Particle Accelerator Conference. IEEE, 2007. http://dx.doi.org/10.1109/pac.2007.4441283.

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Bukosky, Scott, Nathan Anthony, Evan Bursch, Sukrith Dev, Monica Allen et Jeffery Allen. « Modeling of directed particle assembly in two-dimensional structures based on constructal law ». Dans Active Photonic Platforms (APP) 2022, sous la direction de Ganapathi S. Subramania et Stavroula Foteinopoulou. SPIE, 2022. http://dx.doi.org/10.1117/12.2633112.

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Hamlaoui, Soumya, et Franck Davoine. « Facial action tracking using particle filters and active appearance models ». Dans the 2005 joint conference. New York, New York, USA : ACM Press, 2005. http://dx.doi.org/10.1145/1107548.1107592.

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Rodrigues, C., et A. R. Silva. « Active shunts for the LNLS storage ring quadrupoles ». Dans 2007 IEEE Particle Accelerator Conference. IEEE, 2007. http://dx.doi.org/10.1109/pac.2007.4440139.

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Wilson, Andrew S. « Cosmic rays and shock waves in active galaxies ». Dans Particle acceleration in cosmic plasmas. AIP, 1992. http://dx.doi.org/10.1063/1.42717.

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Ciriza, David Bronte, Carlijn Van Baalen, Lucio Isa, Onofrio M. Maragò, Giorgio Volpe et Philip H. Jones. « Elongated active particles in speckle fields ». Dans Frontiers in Optics. Washington, D.C. : Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jw4a.22.

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Rapports d'organisations sur le sujet "Active particle"

Mills, Brantley, Samuel Lee, Luis Gonzalez-Portillo, Clifford Ho et Kevin Albrecht. Technoeconomics of Particle-based CSP Featuring Falling Particle Receivers with and without Active Heliostat Control. Office of Scientific and Technical Information (OSTI), septembre 2022. http://dx.doi.org/10.2172/1890267.

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Lemley, James, et Michael Furey. Improved Design of Active Pixel CMOS Sensors for Charged Particle Detection. Office of Scientific and Technical Information (OSTI), novembre 2007. http://dx.doi.org/10.2172/971516.

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Thomassen, K. Report on the US-Japan Workshop - Plasma Fueling and Active Particle Control. Office of Scientific and Technical Information (OSTI), mars 2000. http://dx.doi.org/10.2172/792790.

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Jiang, Rongzhong, et Charles Rong. Ultrasound-assisted Micro-emulsion Synthesis of a Highly Active Nano-particle Catalyst. Fort Belvoir, VA : Defense Technical Information Center, mars 2010. http://dx.doi.org/10.21236/ada516686.

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Pinnick, Ronald G., J. D. Pendleton et Gorden Videen. Response Characteristics of Active Scattering Aerosol Spectrometer Probes Made by Particle Measuring Systems. Fort Belvoir, VA : Defense Technical Information Center, mars 2000. http://dx.doi.org/10.21236/ada376912.

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Nagaitsev, Sergei. Comment on Particle acceleration by stimulated emission of radiation near a solid-state active medium. Office of Scientific and Technical Information (OSTI), mai 2011. http://dx.doi.org/10.2172/1016885.

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Sery, Joseph. Development of Active Absorbers Using a Matrix of Tungsten Powder and Epoxy for Particle Detection in Nuclear Physics. Final Technical Report SBIR Award No. DE-SC0015185. Office of Scientific and Technical Information (OSTI), janvier 2019. http://dx.doi.org/10.2172/1491479.

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Morkun, Volodymyr, Natalia Morkun, Andrii Pikilnyak, Serhii Semerikov, Oleksandra Serdiuk et Irina Gaponenko. The Cyber-Physical System for Increasing the Efficiency of the Iron Ore Desliming Process. CEUR Workshop Proceedings, avril 2021. http://dx.doi.org/10.31812/123456789/4373.

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It is proposed to carry out the spatial effect of high-energy ultrasound dynamic effects with controlled characteristics on the solid phase particles of the ore pulp in the deslimer input product to increase the efficiency of thickening and desliming processes of iron ore beneficiation products. The above allows predicting the characteristics of particle gravitational sedimentation based on an assessment of the spatial dynamics of pulp solid- phase particles under the controlled action of high-energy ultrasound and fuzzy logical inference. The object of study is the assessment of the characteristics and the process of control the operations of thickening and deslaming of iron ore beneficiation products in the conditions of the technological line of the ore beneficiation plant. The subject of study is a cyber-physical system based on the use of high-energy ultrasound radiation pressure effects on iron-containing beneficiation products in the technological processes of thickening and desliming. The working hypothesis of the project is that there is a relationship between the physical-mechanical and chemical-mineralogical characteristics of the iron ore pulp solid- phase particles and their behavior in technological flows under the influence of controlled ultrasonic radiation, based on which the imitation modeling of the gravitational sedimentation process of the iron ore pulp solid-phase particles can be performed directly in the technological process. Also, the optimal control actions concerning the processes of thickening and desliming can be determined.

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Balch, William M., et Cynthia H. Pilskaln. Transport of Optically Active Particles from the Surface Mixed Layer. Fort Belvoir, VA : Defense Technical Information Center, septembre 2003. http://dx.doi.org/10.21236/ada620100.

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Plueddemann, Albert J. Chalk-Ex : Transport of Optically Active Particles from the Surface Mixed Layer. Fort Belvoir, VA : Defense Technical Information Center, mai 2005. http://dx.doi.org/10.21236/ada444169.

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