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Статті в журналах з теми "Suspensions de particules"
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Reus, V., L. Belloni, T. Zemb, N. Lutterbach, and H. Versmold. "Spectres de diffusion et pression osmotique de suspensions colloïdales de particules de latex chargées." Journal de Chimie Physique 92 (1995): 1233–56. http://dx.doi.org/10.1051/jcp/1995921233.
Повний текст джерела
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Auradou, Harold, Carine Douarche, Adama Creppy, Hector Matias Lopez, and Éric Clément. "Viscosité d’une suspension de bactéries : des efforts individuels aux efforts collectifs." Reflets de la physique, no. 57 (April 2018): 20–23. http://dx.doi.org/10.1051/refdp/201857020.
Повний текст джерелаАнотація:
En 1906, Albert Einstein [1] a montré que l’ajout de particules sphériques solides dans un fluide augmente sa viscosité. En est-il encore ainsi quand les particules sont « actives » (c’est-à-dire motiles) ? Des expériences récentes avec des suspensions de bactéries Escherichia coli, qui sont de type « pousseur », démontrent un effet opposé : aux faibles taux de cisaillement, la viscosité macroscopique du liquide chute jusqu’à devenir nulle. Ce phénomène vient essentiellement du fait que la puissance motrice des bactéries contribue à la puissance mécanique fournie au fluide pour assurer son écoulement, cette contribution ayant une valeur nette non nulle en raison de l’organisation de la nage des bactéries soit individuellement, soit collectivement.
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Elomrani, M., J. M. Brunello, M. Nomine, and P. Blazy. "Préparation des mélanges charbon-eau: Effet de la nature du charbon et amélioration de la qualité des suspensions par action sur les propriétés des particules." Powder Technology 57, no. 4 (April 1989): 223–34. http://dx.doi.org/10.1016/0032-5910(89)80041-5.
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Bogdevičius, Marijonas, and Raimundas Junevičius. "DYNAMIC PROCESSES OF THE RETROFITED REAR SUSPENSION OF THE VEHICLE." TRANSPORT 19, no. 6 (December 31, 2004): 262–68. http://dx.doi.org/10.3846/16484142.2004.9637985.
Повний текст джерелаАнотація:
The main aim of the investigation is to design rear suspension and to improve the dynamic characteristics of the vehicle. Three types of rear suspensions that consist of a leaf spring, a hydraulic and a pneumatic damper, an air spring are designed. The dynamic models of the quarter car with these rear suspensions are presented. Random disturbance of particular road surface is played back by using a spectral density and Monte Carlo method. Natural frequencies of rear suspension are presented. The dependence of standard deviations of the first, the second and the third derivates of particular random displacements on the vehicle speed is obtained. Dynamic characteristics of three rear suspensions are compared and the best rear suspension is determined.
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Horie, Masanori, Haruhisa Kato, Shigehisa Endoh, Ayako Nakamura, Junko Maru, Naohide Shinohara, and Katsuhide Fujita. "Effects of Various Carbon Nanotube Suspensions on A549, THP-1, and Peritoneal Macrophage Cells." Journal of Biomimetics, Biomaterials and Biomedical Engineering 24 (July 2015): 1–13. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.24.1.
Повний текст джерелаАнотація:
The effects of iron content, fiber length, and stability of carbon nanotube (CNT) suspension on cells were examined. Five kinds of single-wall carbon nanotube (SWCNT) suspensions were prepared: with catalytic iron, without iron, long SWCNTs (stable), short SWCNTs (stable), and short SWCNT (unstable). These suspensions were applied to A549, THP-1, and mouse peritoneal macrophage cells. After a 24-h exposure, the mitochondrial activity, cell membrane damage, intracellular oxidative stress, and expression of cytokine genes were determined. Among these properties of SWCNTs, stability of CNT suspension had the most influence on the cells, whereas the effects of iron content and fiber length were small. The unstable SWCNT suspension caused a substantial increase in intracellular ROS levels. Additionally, the cellular effects of stable multi-wall carbon nanotubes (MWCNTs) were examined. The MWCNT suspension did not show any cellular effects. Overall, influences of CNT suspension on mitochondrial activity and cell membrane damage were small. These results suggest that the physical properties of CNT suspension are important factors for their cellular effects. Thus, CNT suspensions prepared with the same material but having different physical properties would differ in the cellular effects they exert, including cytotoxicity. Therefore, physical characterization of CNT suspensions is essential to the evaluation of CNT toxicity. In particular, stability of CNT suspension notably influenced the intracellular ROS level.
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Moravec, Jiří, Tomáš Jirout, František Rieger, and Lukáš Krátký. "Mixing system for highly concentrated fine-grained suspensions." Polish Journal of Chemical Technology 11, no. 4 (January 1, 2009): 52–56. http://dx.doi.org/10.2478/v10026-009-0043-9.
Повний текст джерелаАнотація:
Mixing system for highly concentrated fine-grained suspensions The mixing equipment for highly concentrated fine-grained suspensions must be designed differently from the equipment in which a suspension with a low concentration of the solid phase or bigger particles is mixed. It is due to the different rheological properties of the suspensions. In this work we are trying to find a suitable mixing system for a highly concentrated fine-grained suspension. The aim was to determine an effect of particular geometrical parameters of the tested mixing systems on a suspension process, especially from the energetic viewpoint. The energetic costs of all the used mixing systems were compared on the basis of the power consumption which was necessary for reaching the state of sufficient suspension movement in the whole mixed bulk. As a result, it was confirmed that multistage impellers can be used even in standard vessels (with a liquid level height equal to a vessel diameter) with a profit. During experiments, the state of sufficient movement was determined by a visual observation of the suspension at the vessel bottom, at the wall and also at the suspension level.
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Goel, Sneha, Stefan Björklund, Nicholas Curry, Sivakumar Govindarajan, Urban Wiklund, Caterina Gaudiuso, and Shrikant Joshi. "Axial Plasma Spraying of Mixed Suspensions: A Case Study on Processing, Characteristics, and Tribological Behavior of Al2O3-YSZ Coatings." Applied Sciences 10, no. 15 (July 27, 2020): 5140. http://dx.doi.org/10.3390/app10155140.
Повний текст джерелаАнотація:
Thermal spraying deploying liquid feedstock offers an exciting opportunity to obtain coatings with characteristics vastly different from those produced using conventional spray-grade powders. The most extensively investigated variant of this technique is Suspension Plasma Spraying (SPS), which utilizes a suspension of fine powders in an appropriate medium. The relatively recent advent of axial feed capable plasma spray systems can enable higher throughputs during SPS, provides the possibility for spraying with longer stand-off distances, and also permit the use of suspensions with higher solid loading. The present work investigates axial plasma sprayed coatings produced using a mixed suspension of fine (submicron or nano-sized) powders of Al2O3 and YSZ as a case study. Deposition of the mixed suspension using axial injection plasma spraying, comprehensive evaluation of characteristics of the resulting coatings, and assessment of their tribological behavior were of particular interest. Evaluation of surface morphology, microstructure, and hardness of the coatings reveals that axial SPS of mixed suspensions provides an exciting pathway to realize finely structured multi-constituent coatings using suspensions with as high as 40 wt.% solid loading. The study of scratch, dry sliding wear, and erosion behavior also specifically shows that the addition of YSZ in the Al2O3 matrix can improve the tribological properties of the coating.
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Mahlberg, Michaela, Catherine Smith, and Simon Preston. "Phrases in literary contexts." Current issues in phraseology 18, no. 1 (May 13, 2013): 35–56. http://dx.doi.org/10.1075/ijcl.18.1.05mah.
Повний текст джерелаАнотація:
This paper addresses relations between lexico-grammatical patterns and texts. Our focus is on a specific linguistic unit, the ‘suspended quotation’ (or ‘suspension’), which has received particular attention in Dickens studies. The suspended quotation refers to an interruption of a fictional character’s speech by the narrator with a sequence of at least five words. We show how corpus linguistic methods can help to systematically study suspensions in a corpus of Dickens’s novels: we investigate relationships between patterns of body language presentation and suspensions; we consider the distribution of suspensions across novels; and we illustrate how patterns in suspensions relate to meanings of reporting verbs. Overall, we argue that suspensions are discernible units that contribute to meaningful patterns in narrative prose.
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PARREAU, FRANÇOIS, and EMMANUEL ROY. "Prime Poisson suspensions." Ergodic Theory and Dynamical Systems 35, no. 7 (August 4, 2014): 2216–30. http://dx.doi.org/10.1017/etds.2014.32.
Повний текст джерелаАнотація:
We establish a necessary and sufficient condition for a Poisson suspension to be prime. The proof is based on the Fock space structure of the $L^{2}$-space of the Poisson suspension. We give examples of explicit infinite measure-preserving systems, in particular of non-singular compact group rotations that give rise to prime Poisson suspensions. We also compare some properties of so far known prime transformations with those of our examples, showing that these examples are new.
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Khuzhayorov, Bakhtiyor, Bekzodjon Fayziev, Gafurjan Ibragimov, and Norihan Md Arifin. "A Deep Bed Filtration Model of Two-Component Suspension in Dual-Zone Porous Medium." Applied Sciences 10, no. 8 (April 17, 2020): 2793. http://dx.doi.org/10.3390/app10082793.
Повний текст джерелаАнотація:
In the paper, a mathematical model for the filtration of two-component suspensions in a dual-zone porous medium is considered. The model consists of the mass balance equations, the kinetic equations for active and passive zones of porous medium for each component of the suspension and Darcy’s law. To solve the problem, a numerical algorithm for computer experimentation is developed on the basis of finite difference method. Based on numerical results, the main characteristics of suspension filtration in a porous medium are established. Influences of model parameters on transport and deposition of suspended particles of two-component suspension in porous media are analysed. It is shown that the polydispersity of suspension and multistage nature of the deposition kinetics can lead to various effects that are not characteristic for the transport of one-component suspensions with one-stage particle deposition kinetics. In particular, in distribution of the concentration of suspended particles in a moving fluid non-monotonic dynamics are obtained at individual points in the medium. It is shown that at the points of the medium near to the input section, the concentration of deposited particles can reach partial capacities in the passive zone.
Дисертації з теми "Suspensions de particules"
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Vallée, Robin. "Suspensions de particules inertielles dans des écoulements turbulents." Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4025.
Повний текст джерелаАнотація:
Cette thèse porte sur la dynamique de particules inertielles suspendues dans des écoulements de fluide turbulents régis par les équations de Navier-Stokes incompressibles. La compréhension du transport de ces particules est importante dans un grand nombre d’applications, comme la croissance de planétésimaux par accrétion, l'évolution du plancton dans les océans, la croissance de cristaux de glace dans les nuages ou encore la sédimentation d’impuretés dans les conduites. Malgré la présence de ces particules dans de nombreux processus industriels ou naturels, leur dynamique reste un sujet mal compris. Le but de cette thèse est de contribuer à une meilleure compréhension de certains aspects impliquant le transport de particules inertielles dans des écoulements turbulents en utilisant notamment les résultats de simulations numériques directes. Elle est divisée en quatre chapitres. Le premier est consacré à une introduction des motivations, des méthodes numériques utilisées ainsi qu'à une revue des résultats déjà connus sur ce sujet. Le deuxième chapitre porte sur la généralisation du phénomène de turbophorèse au cas d'écoulements homogènes et isotropes, et vient donc compléter une approche essentiellement utilisée pour les écoulements inhomogènes. Il est notamment montré que malgré leur moyenne uniforme, les fluctuations turbulentes locales mènent à des inhomogénéités dans la distribution des particules aux échelles inertielles. Ensuite, le troisième chapitre se consacre à l'accrétion de particules inertielles par une sphère dans un écoulement moyen. Dans un premier temps, il est montré que des rebonds inélastiques de particules ponctuelles sur la surface de la sphère ne sont pas suffisants pour observer un effondrement inélastique si elles ne sont soumises qu'à une force de traînée visqueuse. Dans un second temps l’étude de petites particules soumises à une force de gravité montre des efficacités d'accrétion non triviales avec notamment des collisions observées à l'arrière du collecteur. Enfin, le dernier chapitre s'intéresse à des particules de taille finie suspendues dans un écoulement turbulent en canal plan, soumises à leur force de traînée visqueuse et à une force de lubrification proche des parois. Un étude statistique de la distribution de particules et de leurs collisions avec les parois permet alors d’améliorer la compréhension des mécanismes de dépositionThis thesis focuses on the dynamics of inertial particles suspended in turbulent fluid flows that are governed by the incompressible Navier-Stokes equations. Understanding the transport of these particles is important in a number of applications, such as the growth of planetesimals by accretion, the evolution of plankton in the oceans, the growth of ice crystals in clouds or the sedimentation of impurities in pipes. Despite the presence of these particles in many industrial or natural processes, their dynamics remain a poorly understood subject. The aim of this thesis is to contribute to a better understanding of certain aspects involving the transport of inertial particles in turbulent flows, using in particular the results of direct numerical simulations. It is divided into four chapters. The first is devoted to an introduction to the motivations, the numerical methods used, as well as to a review of the results already known on this topic. The second chapter deals with the generalization of the phenomenon of turbophoresis in the case of homogeneous and isotropic flows, and therefore completes an approach mainly used for inhomogeneous flows. In particular, it is shown that despite their uniform mean, local turbulent fluctuations lead to inhomogeneities in the distribution of particles at inertial scales. Then, the third chapter is devoted to the accretion of inertial particles by a sphere embedded in a mean flow. First, it is shown that inelastic bounces of point particles on the surface of the sphere are not sufficient to lead to inelastic collapse, when they are subjected only to a viscous drag force. Secondly, the study of small particles subjected to the force of gravity, shows non-trivial accretion efficiencies, with in particular collisions observed at the back of the collector. Finally, the last chapter deals with particles of finite sizes suspended in a turbulent channel flow and subject to their viscous drag force and to a lubricating force close to the walls. A statistical study of the distribution of particles and of their collisions with the walls then improves the understanding of deposition mechanisms
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Leverrier, Cassandre. "Relations Structure/Propriétés de Suspensions de Particules Végétales." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLA020.
Повний текст джерелаАнотація:
Les purées de fruits et légumes sont considérées dans ce travail comme des suspensions concentrées de particules végétales déformables suspendues dans une phase aqueuse non-Newtonienne, riche en sucre et en pectines solubles. Par une approche de type sciences des matériaux, ce travail a pour but de mieux comprendre et modéliser les relations structure-propriétés de ces systèmes à base de végétaux transformés.Pour limiter les facteurs de variabilité liés à la variété, la maturité ou au procédé de transformation des fruits, un lot unique de purée de pommes Golden Delicious a été utilisé pour l’intégralité de ce travail.L’utilisation de traitements mécaniques variables a permis de mettre en avant l’importance des paramètres de structures sur les propriétés rhéologiques des suspensions de particules végétales et de confirmer l’impact de premier ordre de la concentration en particules sur les propriétés rhéologiques. Trois domaines de concentration ont été mis en évidence et modélisés, permettant ainsi de proposer une définition de la fraction volumique pour ces particules végétales molles et très déformables, la fraction volumique des suspensions de particules végétales ne faisant pas encore consensus en littérature. La définition proposée dans ce travail permet, à phase continue équivalente, d’obtenir une courbe maitresse regroupant les différentes distributions de taille de particules sur toutes les gammes de concentration étudiées.Afin de mieux appréhender l’impact de la phase continue sur le comportement rhéologique des suspensions de particules végétales, des particules modèles ont été mises au point à partir du lot de purée réelle et suspendues dans cinq phases aqueuses modèles variant en viscosité, en composition et en force ionique. Les résultats de cette étude permettent de conclure que les propriétés élastiques des suspensions concentrées sont essentiellement gouvernées par les interactions entre les particules, la phase continue ayant un impact négligeable. Le rôle lubrifiant de la phase continue en domaine concentré a pu être mis en évidence par les mesures de seuil d’écoulement et par les mesures de viscosité.Une approche originale combinant particules modèles, microscopie confocale et reconstitution 3D a permis d’accéder aux modifications morphologiques subies par les particules en milieu très concentré, donnant ainsi accès aux ordres de grandeurs de diminution de volume subie par les particules lors de l’encombrement du système.Ce travail a également permis d’aboutir à la proposition d’une loi d’écoulement permettant de modéliser la dépendance de la viscosité à la fraction volumique occupée par les particules végétales, sur une large gamme de concentration. Ce modèle représente une avancée certaine dans la compréhension de ces systèmes, aucun modèle comparable n’avait encore été proposé dans la littérature sur ce type de particulesIn this work, fruit and vegetable purees are considered as concentrated suspensions of soft, deformable plant particles, suspended in a non-Newtonian aqueous phase, containing sugar and soluble pectins. Using a materials science approach, this work aims in better understanding and modelling the structure/properties relationships of plant based processed systems.A single batch of Golden Delicious apple puree was used in this work to avoid variability related to variety, maturity or processing method.Mechanical treatments were used to highlight the impact of structural parameters on the rheological behaviour of plant particles suspensions. It confirms the first order impact of particle concentration on rheological properties. Three concentration domains have been identified and modelled, allowing to provide a definition of the volume fraction for these soft and highly deformable plant particles. The volume fraction of plant particle suspensions is not forming consensus yet in literature. The definition proposed in this work allows to built a master curve bringing together the different particle size distributions, all over the concentrations studied.To understand the impact of the continuous phase on the rheological behaviour of plant particle suspensions, model particles have been developed from the original batch of apple puree. Model particles were suspended in five controlled aqueous phases varying in viscosity, composition, and ionic strength. This study shows that elastic properties of concentrated suspensions are essentially governed by the interactions between the particles, continuous phase having a negligible impact. The lubricating role of the continuous phase in the concentrated domain has been highlighted by yield stress and viscosity measurements.An original approach combining model particles, confocal microscopy and 3D reconstruction gives us access to morphological changes experienced by particles in very concentrated medium. The volume decrease experienced by the particles was evaluated. In this work, a model describing the dependence of the viscosity to the volume fraction of soft plant particles was proposed. This model represents a clear progress in the understanding of these systems. No comparable model has ever been proposed in the literature to describe this kind of plant particles
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VOLKOVA, OLGA. "Etude de la rheologie de suspensions de particules magnetiques." Nice, 1998. http://www.theses.fr/1998NICE5264.
Повний текст джерелаАнотація:
Dans cette etude portant sur la rheologie de suspensions magnetiques modeles nous avons choisi quatre types de suspensions qui couvrent a la fois le domaine des particules faiblement magnetiques (suspension aqueuse de particules de polystyrene contenant des inclusions de magnetite et suspension inverse : particules non magnetiques dans un ferrofluide) et des particules fortement magnetiques (suspension de particules microniques de fer carbonyle et suspension macroscopique modele de spheres millimetriques d'acier dans de l'huile silicone). Les mesures de permeabilite magnetique sur ces quatre types de suspensions ont permis de valider le modele de milieu effectif dans le cas des suspensions faiblement magnetiques et de montrer l'efficacite des methodes des calculs par elements finis pour predire les forces magnetiques entre particules d'acier et les permeabilites de chaine de spheres. Les contraintes seuil de rupture ont ete mesurees et comparees aux predictions de deux modeles : un modele analytique pour les particules faiblement magnetiques et un modele numerique pour les particules fortement magnetiques. L'accord est satisfaisant dans les deux situations et montre respectivement une saturation en fonction de la fraction volumique dans le premier cas et un comportement lineaire dans le second cas. Les courbes rheologiques experimentales obtenues sur ces 4 systemes ont montre un comportement de la viscosite dynamique qui decroit en fonction du nombre de mason avec un exposant compris entre 0. 78 et 0. 98. Cet exposant invalide les modeles actuels qui predisent soit un exposant unite soit 2/3. L'hysteresis observe aux faibles taux de cisaillement est explique en termes de structures mesoscopiques visualisees par microscopie optique. Une separation de phase associee a un saut de viscosite a ete decouverte en utilisant une geometrie cone-plan. Nous avons montre que cette separation de phase etait provoquee par une transition nematique-isotrope correspondant a la rupture de paires de particules.
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Zidi, Koceila. "Écoulement d'une suspension de particules en compression." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPAST197.
Повний текст джерелаАнотація:
L'étude des suspensions de particules est cruciale en raison de leur omniprésence dans divers domaines industriels et naturels. Comprendre leur comportement permet d'améliorer des procédés tels que la fabrication de matériaux composites, le traitement des eaux et l'étude des sédiments et des sols. Au cours des deux dernières décennies, la rhéologie des suspensions de particules a été largement étudiée en écoulements de cisaillement simple. Les expériences ont montré que la viscosité effective d'une suspension isodense et non-brownienne augmente avec la fraction volumique en particules. La question posée dans ma thèse est de savoir si les lois rhéologiques permettent de décrire le comportement des suspensions de particules dans des configurations plus complexes comme des écoulements de compression. Nous avons étudié expérimentalement le comportement des suspensions dans deux configurations d'écoulement de compression. Dans la première configuration, la suspension est comprimée entre un disque mobile s'approchant à vitesse imposée vers une paroi verticale. Des mesures locales de pression ont été réalisées, en faisant varier la fraction volumique de la suspension et la vitesse de compression. Un cadre théorique a été établi permettant de relier la différence de pression radiale dans l'écoulement de compression à la viscosité effective de la suspension et donc de la mesurer indirectement. Nous avons montré que la viscosité effective déduite par cette approche dans un écoulement de compression est identique à celle mesurée dans une configuration classique de cisaillement simple. Dans la deuxième configuration, la suspension est comprimée entre une sphère qui sédimente sous l'effet de son propre poids vers une paroi horizontale. Des mesures de vitesse de sédimentation de la sphère ont été réalisées. L'influence des paramètres de la suspension, tels que le diamètre et la concentration des particules, ainsi que des paramètres géométriques, comme le rayon de la sphère et la largeur du réservoir, a été étudiée. Dans la région loin de la paroi, le principe fondamental de la dynamique nous a permis de prédire la vitesse de sédimentation de la sphère et d'en déduire la viscosité effective de la suspension, qui correspond à celle du cisaillement simple. Nous avons montré que la suspension se comporte comme un fluide effectif newtonien. La dynamique d'approche de la sphère dans la suspension s'écarte de celle qu'elle aurait dans un fluide newtonien. Proche de la paroi, on applique la théorie de lubrification. Cette théorie prédit que la vitesse de sédimentation de la sphère évolue linéairement avec la distance par rapport à la paroi horizontale, avec une vitesse nulle au contact avec la paroi. Dans le cas de la suspension, la vitesse de sédimentation de la sphère évolue de manière non linéaire avec la distance à la paroi. Nous avons également mesuré une vitesse d'impact de la sphère non nulle avec la paroi. Nous avons proposé une relation empirique pour la vitesse d'approche qui permet de regrouper toutes les données expérimentales sur une courbe unique dans toute la gamme des paramètres étudiésThe study of particle suspensions is crucial due to their omnipresence in various industrial and natural domains. Understanding their behavior enables us to improve processes such as the manufacture of composite materials, water treatment and the study of sediments and soils. Over the past two decades, the rheology of particle suspensions has been extensively studied in simple shear flows. Experiments have shown that the effective viscosity of an isodense, non-Brownian suspension increases with the particle volume fraction. The question posed in my thesis is whether rheological laws can be used to describe the behavior of particle suspensions in more complex configurations such as compression flows. We have experimentally investigated the behavior of suspensions in two compression flow configurations. In the first configuration, the suspension is compressed between a moving disk approaching a vertical wall at an imposed velocity. Local pressure measurements were carried out, varying the volume fraction of the suspension and the compression velocity. A theoretical framework was established, enabling the radial pressure difference in the compression flow to be related to the effective viscosity of the suspension, and thus measured indirectly. We have shown that the effective viscosity deduced by this approach in compression flow is identical to that measured in a conventional simple shear configuration. In the second configuration, the suspension is compressed between a sphere sedimenting under its own weight towards a horizontal wall. Sedimentation velocity measurements of the sphere were carried out. The influence of suspension parameters, such as particle diameter and concentration, as well as geometric parameters, such as sphere radius and reservoir width, was investigated. In the region far from the wall, the fundamental principle of dynamics enabled us to predict the sedimentation velocity of the sphere and deduce the effective viscosity of the suspension, which corresponds to that of simple shear. We have shown that the suspension behaves like an effective Newtonian fluid. The approach dynamics of the sphere in the suspension deviate from those it would have in a Newtonian fluid. Close to the wall, lubrication theory is applied. This theory predicts that the sedimentation velocity of the sphere evolves linearly with distance from the horizontal wall, with zero velocity at contact with the wall. In the case of suspension, the sedimentation velocity of the sphere evolves non-linearly with distance from the wall. We also measured a non-zero impact velocity of the sphere with the wall. We have proposed an empirical relationship for the approach velocity that allows all the experimental data to be grouped on a single curve across the entire range of parameters studied
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Périn, Frédéric. "Application de la methode d'homogeneisation aux suspensions de fibres longues et aux suspensions multidisperses de particules." Paris 6, 1994. http://www.theses.fr/1994PA066423.
Повний текст джерелаАнотація:
La methode d'homogeneisation est appliquee a une suspension bidimensionnelle concentree et localement periodique de fibres orientees plongees dans un fluide visqueux incompressible. Dans la premiere partie, on considere un ecoulement longitudinal. La suspension se comporte comme un fluide newtonien anisotrope, le tenseur de viscosite etant du second ordre et entierement determine par la microstructure qui n'evolue pas dans le temps. Dans la deuxieme partie, on considere un ecoulement transverse. La suspension se comporte comme un fluide non newtonien anisotrope, le tenseur de viscosite etant du quatrieme ordre et entierement determine par la microstructure qui evolue dans le temps en restant localement periodique. De plus, il apparait dans les equations globales de mouvement des termes d'inertie inattendus. Si la microstructure presente des symetries, on peut obtenir des bornes pour certains des coefficients de viscosite rencontres dans ces deux mouvements. Les resultats numeriques montrent que ces bornes constituent de bonnes approximations des valeurs calculees numeriquement et que la concentration ne peut a elle seule decrire le comportement global du milieu. Dans la troisieme partie, on montre que les resultats obtenus toujours par la methode d'homogeneisation et concernant les suspensions tridimensionnelles concentrees de particules s'etendent au cas des suspensions multidisperses de particules. De meme, dans la quatrieme partie, on montre que les resultats obtenus dans la premiere partie s'etendent au cas des suspensions multidisperses de fibres
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Cisse, Mamadou. "Suspensions turbulentes de particules de tailles finies : dynamique, modification collective de l'écoulement turbulent." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4014/document.
Повний текст джерелаАнотація:
Les travaux numériques et expérimentaux de cette thèse contribuent à une meilleure compréhension de la dynamique de grosses particules dans un écoulement turbulent. Un premier volet m’a permis de quantifier leur mouvement relatif au fluide, ainsi que leur influence locale sur l’écoulement turbulent. Dans un second volet, j'ai trouvé que l'effet collectif des particules est d'atténuer l’amplitude des fluctuations turbulentes. En revanche, celles-ci n’ont pas d’influence sur les propriétés statistiques fines de l’écoulement. Aussi, ces mesures suggèrent l’existence d’une transition de phase dans les grandes échelles de l’écoulement au-delà d’un seuil critique du nombre de particulesThe numerical and experimental work of this thesis contribute to a better understanding of the dynamics of large particles in a turbulent flow. The first part allowed me to quantify their relative motion to the flow and their local influence on the surrounding flow. In a second part, I found that the collective effect of particles is to reduce the amplitude of turbulent fluctuations. In revanche, they have no influence on the fine statistical properties of the flow. Also, these measurements suggest the existence of a phase transition in the larger scales of the flow beyond a critical threshold of the number of particles
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Mongruel, Anne. "Étude expérimentale de suspensions de particules anisotropes en écoulement élongationnel." Phd thesis, Ecole Nationale des Ponts et Chaussées, 1994. http://tel.archives-ouvertes.fr/tel-00520739.
Повний текст джерелаАнотація:
Ce travail comporte deux parties indépendantes: la première concerne les suspensions de particules anisotropes en écoulement élongationnel, la seconde porte sur l'étude en lois d'échelle des couches limites en convection thermosolutale. L'écoulement de suspensions de particules anisotropes présente en déformation élongationnelle des propriétés spécifiques liées à la géométrie des particules. Après la mise en oeuvre d'une cellule d'écoulement à orifice relisant une sollicitation élongationnelle bien définie, des suspensions de fibres non-browniennes sont étudiées dans deux régimes de concentration. En régime dilué, les résultats expérimentaux concernant la dynamique d'orientation d'une fibre sont bien décrits par les équations d'orientations du vecteur directeur obtenues analytiquement. En régime semi-dilué, l'écoulement présente une structuration remarquable, qui est étudiée en fonction de la fraction volumique et du rapport de forme des particules. Un modèle d'écoulement obtenu en minimisant l'énergie dissipée permet d'interpréter les résultats expérimentaux en termes de viscosité élongationnelle, et en relation avec les propriétés de la suspension à l'échelle des particules. Les écoulements de couche limite au voisinage d'une paroi verticale dans un milieu fluide soumis a des gradients de température et de concentration horizontaux présentent une grande variété de situations suivant la valeur des paramètres adimensionnels du problème. Une analyse combinant raisonnements en loi d'échelle et méthode intégrale permet de prédire complètement les différents régimes d'écoulement et les variations des couches limites. Les résultats sont corroborés par des solutions de similitude obtenues numériquement.
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DIEP, TUONG BAO. "Forces et contraintes dans les suspensions de particules legerement deformables." Paris 6, 1994. http://www.theses.fr/1994PA066832.
Повний текст джерелаАнотація:
Si on ne tient pas compte des phenomenes tels que les interactions entre particules ou le mouvement brownien, alors on peut determiner la dynamique de la phase dispersee d'une suspension en moyennant les proprietes obtenues pour une particule. Dans le premier chapitre, nous mettons en evidence le role joue par les tenseurs cinetiques dans la dynamique d'une particule. Nous montrons comment il est possible d'evaluer les contraintes regnant dans la particule par une serie de moments des forces exercees sur la particule. Dans le deuxieme chapitre, nous considerons une particule immergee dans un fluide en ecoulement a potentiel. Par l'utilisation de l'equation de bernoulli presentee sous une forme inedite, nous calculons la force appliquee sur la particule et les moments qui lui associes, aboutissant a des expressions qui mettent en valeur leurs significations physiques. Comme toutes les grandeurs dependent en dernier lieu du potentiel de l'ecoulement, nous determinons cette quantite explicitement en supposant que la particule est un ellipsoide legerement deformable et que les champs de vitesse du fluide et du solide sont de gradient uniforme. Nous appliquons ces memes hypotheses pour traiter, dans le troisieme chapitre, le cas ou le fluide obeit aux equations de stokes. Des resultats explicites sont donnes concernant les champs de vitesse et de pression du fluide en presence de la particule. De plus, l'expression de la force locale exercee a la surface de la particule nous permet de verifier le resultat de goddard et miller suivant lequel, avec les hypotheses presentees plus haut, les contraintes dans la particule sont uniformes. En utilisant la condition aux limites relative a la quantite de mouvement, nous etablissons les relations liant les parametres appartenant a la particule avec ceux du fluide. Dans le quatrieme chapitre, nous generalisons les resultats obtenus pour une particule a l'ensemble de la suspension en utilisant les moyennes spatiales. Les calculs de quantites telles que les contraintes dans la phase particulaire ou les forces interfaciques montrent le role joue par les moments de force exerces par le fluide sur les particules. Enfin, nous expliquons pourquoi les resultats obtenus par lhuillier avec les moyennes d'ensemble sont applicables uniquement aux suspensions de particules rigides et identiquement spheriques.
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Mongruel, Anne. "Etude expérimentale de suspensions de particules anisotropes en écoulement élongationnel." Marne-la-vallée, ENPC, 1994. http://www.theses.fr/1994ENPC9409.
Повний текст джерелаАнотація:
Ce travail comporte deux parties indépendantes: la première concerne les suspensions de particules anisotropes en écoulement élongationnel, la seconde porte sur l'étude en lois d'échelle des couches limites en convection thermosolutale. L'écoulement de suspensions de particules anisotropes présente en déformation élongationnelle des propriétés spécifiques liées a la géométrie des particules. Après la mise en œuvre d'une cellule d'écoulement a orifice réalisant une sollicitation élongationnelle bien définie, des suspensions de fibres non-browniennes sont étudiées dans deux régimes de concentration. En régime dilue, les résultats expérimentaux concernant la dynamique d'orientation d'une fibre sont bien décrits par les équations d'orientations du vecteur directeur obtenues analytiquement. En régime semi-dilue, l'écoulement présente une structuration remarquable, qui est étudiée en fonction de la fraction volumique et du rapport de forme des particules. Un modèle d'écoulement obtenu en minimisant l'énergie dissipée permet d'interpréter les résultats expérimentaux en termes de viscosité élongationnelle, et en relation avec les propriétés de la suspension à l'échelle des particules. Les écoulements de couche limite au voisinage d'une paroi verticale dans un milieu fluide soumis à des gradients de température et de concentration horizontaux présentent une grande variété de situations suivant la valeur des paramètres adimensionnels du problème. Une analyse combinant raisonnements en loi d'échelle et méthode intégrale permet de prédire complètement les différents régimes d'écoulement et les variations des couches limites. Les résultats sont corrobores par des solutions de similitude obtenues numériquement.
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Fall, Abdoulaye. "Ecoulement et blocage de suspensions concentrées." Paris 7, 2008. http://www.theses.fr/2008PA077142.
Повний текст джерелаАнотація:
Nous reportons ici le comportement rhéologique de suspensions concentrées de particules non browniennes de fécule de maïs ou de polystyrène sphériques et monodisperses. Le système modèle de particules de polystyrène est utilisé afin de contrôler les propriétés physicochimiques de la suspension. Ce travail expérimental s'articule autour de deux aspects rencontrés chez les fluides complexes : le seuil d'écoulement et le seuil de rhéoépaississement. Dans un premier temps, nous avons étudié l'origine du seuil d'écoulement. Nous avons, à partir de techniques de rhéologie classique et locale par IRM, montré que le seuil d'écoulement des suspensions modèles n'est observé que par l'introduction d'un contraste de densité entre les particules et le fluide suspendant. Ce contraste de densité introduit alors une consolidation à l'échelle des particules. Le seuil d'écoulement apparaît alors sans aucune sédimentation macroscopique de l'échantillon. Dans un second temps, nous avons étudié un phénomène de structuration dynamique, sous écoulement : le rhéoépaississement. Ainsi, en couplant des mesures macroscopiques originales (comme l'étude de l'influence de l'entrefer de la géométrie de mesure sur le comportement rhéoépaississant, et des mesures de dilatation volumique en fonction du taux de cisaillement) et des mesures locales des propriétés d'écoulement par IRM, nous montrons que le rhéoépaississement de la suspension de fécule de maïs est une conséquence directe de la dilatance de Reynolds. Par ailleurs, le système modèle, contrairement à la suspension de fécule de maïs, présente un rhéoépaississement qui est accompagné d'un régime de localisation qui devient responsable d'un blocage partiel de l'écoulement dans l'entrefer de la géométrie de CouetteWe study the rheological behavior of concentrated suspensions of non-Brownian particles: cornstarch or mono-disperse spherical polystyrene beads. The latter model System is used to be able to control the physical properties of the suspension. We focus on two phenomena encountered in particle pastes: the yield stress and the shear thickening behavior. In a fïrst series of experiments we studied the origin of the yield stress. From classical rheology and local MRI velocimetry and density measurements we show that the origin of the yield stress for the model System of spherical beads is sedimentation, which we observe by introducing different contrasts in density between particles and fluid. The difference in density leads to a close packing of sedimenting or creaming particles, leading in turn to a yield stress. In a second series of experiments, we have studied a dynamical behaviour of the pastes under shear, focusing on the shear thickening. By coupling the original macroscopic measurements (the study of the influence of the gap size on the shear thickening behavior and the dilation effect as a function of the shear rate) and local flow properties measured by MRI, we show that the shear thickening of cornstarch suspension is a direct consequence of the Reynolds dilatancy. In addition, the model System, unlike the cornstarch suspension, presents a shear thickening which is accompanied by a shear localisation regime. This localisation regime becomes responsible for a partial jamming of the flow in the gap of our Couette cell
Книги з теми "Suspensions de particules"
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Salatino, Edgardo Horacio. El querellante particular y el particular damnificado: Participación en el juicio abreviado y en la suspensión del proceso penal a prueba. Ciudad Autónoma de Buenos Aires, República Argentina: Fabián J. Di Plácido Editor, 2007.
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2
G, Malghan Subhas, ed. Electroacoustics for characterization of particulates and suspensions: Proceedings of workshop held at the National Institute of Standards and Technology, February 3-4, 1993, Gaithersburg, Maryland. Gaithersburg, MD: NIST, 1993.
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3
Gerard, McMeel. Part III Particular Contractual Provisions, 22 Change of Circumstances and ‘ Force Majeure ’ Clauses. Oxford University Press, 2017. http://dx.doi.org/10.1093/law/9780198755166.003.0022.
Повний текст джерелаАнотація:
This chapter looks at regimes for change of circumstances and other future events which have an impact on performance. These are universally known as force majeure provisions. Such clauses opt out of the narrow and uncertain scope of the common law doctrine of frustration. They avoid the common law rule that any element of choice or election as to which contracts to perform is incompatible with frustration. The parties can design their own remedial scheme, including suspension of performance (if appropriate) as well as complete relief from the obligation to perform. Furthermore, they can make appropriate adjustments to the parties' liabilities and circumvent the arcane regime of the Law Reform (Frustrated Contracts) Act 1943.
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Eisenberg, Melvin A. Augmented Sanctions: Material Breach, Total Breach, and Opportunistic Breach; Cure; Suspension and Termination. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199731404.003.0050.
Повний текст джерелаАнотація:
Every breach of contract gives the promisee the right to recover expectation damages. Under certain circumstances a promisee may also have the right to invoke augmented sanctions, including damages measured on the basis that the promisor totally failed to perform the contract (as opposed to damages measured only by the harm from breach of a particular term), and suspension and termination of the contract. If a promisor commits a breach that was neither material nor opportunistic and the breach is curable—that is, if the effect of the breach is reversible—she should be able to avoid the imposition of an augmented sanction by curing the breach promptly after the promisee gives her notice that she is in breach and that unless she promptly cures the breach he will terminate the contract.
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Sosa, Ernest. Epistemic Explanations. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198856467.001.0001.
Повний текст джерелаАнотація:
This book develops an improved virtue epistemology and uses it to explain several epistemic phenomena. Part I lays out a telic virtue epistemology that accommodates varieties of knowledge and understanding particularly pertinent to the humanities. Part II develops an epistemology of suspension of judgment, by relating it to degrees of confidence and to inquiry. Part III develops a substantially improved telic virtue epistemology by appeal to default assumptions important in domains of human performance generally, and in our intellectual lives as a special case. This reconfigures earlier virtue epistemology, which now seems a first approximation. This part also introduces a metaphysical hierarchy of epistemic categories and defends in particular a category of secure knowledge.
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Khwarg, Juewon, Daniel A. Fung, Corey Hunter, and Timothy T. Davis. Platelet-Rich Plasma Injections. Edited by Mehul J. Desai. Oxford University Press, 2018. http://dx.doi.org/10.1093/med/9780199350940.003.0028.
Повний текст джерелаАнотація:
Platelet-rich plasma (PRP) is an autologous plasma suspension enriched with a supraphysiologic concentrate of platelets, isolated through a process of centrifugation. Administered locally (usually by injection or direct application) to areas of injury, PRP contains a high density of growth factors, which are believed to potentiate the body’s natural regenerative processes. Over the past 20 years, interest in PRP therapy has grown exponentially, as it offers a relatively safe, autologous treatment modality. It has gained particular popularity for a wide variety of musculoskeletal pathologies. There is a growing body of scientific literature that is giving further insight into PRP’s therapeutic effects. This chapter will review the history, preparation techniques, basic science justifications, current clinical evidence, as well as procedural considerations for the therapeutic use of PRP.
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Succi, Sauro. LB for Flows with Suspended Objects: Fluid–Solid Interactions. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199592357.003.0031.
Повний текст джерелаАнотація:
In the recent years the theory of the fluctuating LB, as it was proposed and developed by A.J.C. Ladd in the early 90s, has undergone major developments, both at the level of theoretical foundations and practical implementation. This Chapter provides a cursory view of such developments, with special focus on the general formulation of fluid–solid interactions within the Lattice Boltzmann formalism. Clearly, the rheological behavior of these suspensions is highly accepted by the way the suspended particles interact with the fluid and among themselves. From the mathematical and computational standpoint, this configures a technically thick issue, namely the treatment of fluid-solid moving boundaries, in a more macroscopic-oriented context also known as fluid-structure interactions (FSI). In the sequel, a description of a number of methods which have been developed to include FSI within the LB formalism, is presented. In particular, the case of rigid and deformable bodies, both vital to many applications in science and engineering, shall be covered
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Gopar Osorio, Emiliano. "Escucha mi breve relación". Puesta en escena del relato en la literatura dramática áurea española y novohispana. Universidad Nacional Autónoma de México, 2022. http://dx.doi.org/10.19130/iifl.ebrel.2022.0184s002x29.
Повний текст джерелаАнотація:
La relación es un discurso narrativo que se encuentra en la mayor parte del teatro áureo, donde los personajes asumen una actitud diferente de la que representan durante el diálogo: el receptor permanecerá momentáneamente dispuesto a oír el relato, aunque ello implique una disminución de la atención que brinda a lo que pasa a su alrededor. Por su parte, el personaje emisor iniciará una representación particular para transmitir el relato a sus oyentes. Ofrecer una relación es un acto dramático, no una suspensión de la acción. En el transcurso de esta exposición se nota que cualitativamente no hay gran diferencia entre las obras novohispanas y las españolas, como sí lo hay cuantitativamente.
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Cadoppi, Alberto, and Mattia Celva. Competency to Stand Trial in Italy. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198788478.003.0012.
Повний текст джерелаАнотація:
This chapter assesses competency to stand trial in Italian Criminal Procedure, using a two-pronged analysis. First, there is analysis of the relevant provisions of the Italian Code of Criminal Procedure (CCP). Pursuant to these provisions, the trial must be suspended in case the defendant is not capable of meaningful participation. The CCP also regulates various aspects connected to this incapacity. In particular, it sets forth the grounds on which the suspension must be granted and provides for the means through which the incompetency should be ascertained, if not immediately apparent. The picture painted by the Code is complex and many of these provisions have been challenged as unconstitutional in front of the Constitutional Court, with different results. The chapter focuses on such problems, in order to illustrate the approach of the Constitutional Court, as well as examining the solutions proposed by legal scholarship, including the definition of incapacity.
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Ishihara, Yuko, Monika Kirloskar-Steinbach, Daniel Raveh, Georgina Tuari Stewart, Dean Anthony Brink, Takeshi Morisato, Pascah Mungwini, et al. Intercultural Phenomenology. Bloomsbury Publishing Plc, 2023. http://dx.doi.org/10.5040/9781350298323.
Повний текст джерелаАнотація:
Intercultural Phenomenology explores the nature of reality by engaging in a cross-cultural dialogue between two of the most influential philosophical traditions of the 20th century. Drawing on ideas from phenomenology, Japanese philosophy and Zen Buddhism, it follows the philosophers who changed their perception of the world by choosing to suspend judgement. Guided by this philosophical method known as the “epoché”, or suspension of judgment in ancient Greek, it is an introduction to the philosophy and practice of letting objects in the world speak for themselves. Inspired by Nishida Kitaro’s insight that true reality is beyond the subject-object duality, the book uses a series of examples and exercises to explore the background to Husserl’s idea of the phenomenological epoché, Hans-Georg Gadamer’s emphasis on play in human understanding and the haiku poet Matsuo Basho’s call for a new level of freedom. This practice-oriented approach moves beyond the traditional East-West divide. It connects various traditions, old and new, contemplative and theoretical, and explains why Japanese philosophy and phenomenology can enrich the quality of our lived experience. Ishihara and Tainer introduce a new approach to the basic practice of phenomenology and the epoché (suspension of judgment) pioneered by Edmund Husserl. The book is designed to serve readers from the general public seeking ways to improve basic quality of life, as well as undergraduate college students interested in phenomenology’s theory and historical background. Both Western philosophy (Kant, Gadamer, Ricoeur and Heidegger) and Asian contemplative traditions (Confucianism, Taoism and Buddhism) are discussed. Particular attention is paid to the Kyoto School tradition, Japanese culture and Zen, drawing upon insights from philosophers Nishida Kitarō, Nishitani Keiji and Ueda Shizuteru, the Zen master Dōgen Zenji and the famous Haiku poet Matsuo Bashō. Theory and practice are combined in a wide variety of experiential exercises and simple life explorations—all potential entries into a more appreciative way of playing with reality.
Частини книг з теми "Suspensions de particules"
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Lundén, Daniel, Lars Hummelgren, Jan Kudlicka, Oscar Eriksson, and David Broman. "Suspension Analysis and Selective Continuation-Passing Style for Universal Probabilistic Programming Languages." In Programming Languages and Systems, 302–30. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-57267-8_12.
Повний текст джерелаАнотація:
AbstractUniversal probabilistic programming languages (PPLs) make it relatively easy to encode and automatically solve statistical inference problems. To solve inference problems, PPL implementations often apply Monte Carlo inference algorithms that rely on execution suspension. State-of-the-art solutions enable execution suspension either through (i) continuation-passing style (CPS) transformations or (ii) efficient, but comparatively complex, low-level solutions that are often not available in high-level languages. CPS transformations introduce overhead due to unnecessary closure allocations—a problem the PPL community has generally overlooked. To reduce overhead, we develop a new efficient selective CPS approach for PPLs. Specifically, we design a novel static suspension analysis technique that determines parts of programs that require suspension, given a particular inference algorithm. The analysis allows selectively CPS transforming the program only where necessary. We formally prove the correctness of the analysis and implement the analysis and transformation in the Miking CorePPL compiler. We evaluate the implementation for a large number of Monte Carlo inference algorithms on real-world models from phylogenetics, epidemiology, and topic modeling. The evaluation results demonstrate significant improvements across all models and inference algorithms.
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Burgers, J. M. "Hydrodynamics. — On the influence of the concentration of a suspension upon the sedimentation velocity (in particular for a suspension of spherical particles)." In Selected Papers of J. M. Burgers, 452–77. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0195-0_16.
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Della Rocca, Giada. "I controlli della malattia." In Studi e saggi, 367–97. Florence: Firenze University Press, 2024. https://doi.org/10.36253/979-12-215-0507-8.22.
Повний текст джерелаАнотація:
The article addresses the topic of disease checks, starting from Del Punta's writings on "The suspension of the employment relationship" of 1992 and on "Disease checks" of 2004, analyzing the discipline provided for by the art. 5 of the Workers' Statute and subsequent implementation measures. In particular, it analyzes the provision of on-call time slots, with the related obligation on the worker, the justified reason for absence and the sanctions for unjustified absence. Finally, it focuses on the relevance of the worker's extra-work behaviors during sick leave and the related non-health checks.
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Giusti, Francesco. "Gestural Communities." In Cultural Inquiry, 71–96. Berlin: ICI Berlin Press, 2024. http://dx.doi.org/10.37050/ci-30_03.
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Memorability, shareability, and repeatability are interrelated characteristics often ascribed to lyric poetry in current theory, sometimes with an emphasis on the transnational potential of its circulation. This article approaches this question of shareability not in terms of diction or form, as is usually the case, but of gesture. Drawing on Bertolt Brecht, Walter Benjamin, and Giorgio Agamben, gesture is defined as both historically situated and transferable to different contexts, but whether or not to re-enact a particular gesture in one’s own context is a political decision. After examining how a sonnet by Andrea Zanzotto addresses the lyric gesture of exhortation offered by a Petrarch sonnet, the article goes on to explore the potentiality opened up for the formation of gestural communities by the suspension of action in the lyric.
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Ott, Lorenz, Torben Gräber, Michael Unterreiner, Johannes Edelmann, and Manfred Plöchl. "Simulating Effects of Suspension Damper Degradation on Common Sensor Signals for Diagnosis Models in the Context of Condition-Based Maintenance." In Lecture Notes in Mechanical Engineering, 869–75. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-70392-8_122.
Повний текст джерелаАнотація:
AbstractDegraded suspension dampers strongly influence vehicle safety and ride comfort, but often occur after several years of operation. Related workshop checks are usually not degradation-adaptive, so they can be significantly delayed to the need for maintenance. To make the maintenance adaptive to degradations, onboard diagnosis methods can be used, which rely on the degradation status extracted from sensor signals.To support the development of sensitive yet robust diagnosis models, a model that can simulate and explain the effects of damper degradation in common sensor signals is proposed. This paper focuses on low-frequency effects in signals of the wheel speed sensors, which are ultra low cost and always available in modern vehicles. As a result, the model shows a good qualitative match to real-world test drives, specifically in the frequency domain. Therefore, various real-world measurements were conducted, in particular, test bench measurements of degraded dampers and vehicle on-road tests.
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Bonelli, Matteo. "Intermezzo in the Rule of Law Play: The Court of Justice’s LM Case." In Defending Checks and Balances in EU Member States, 455–76. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62317-6_19.
Повний текст джерелаАнотація:
AbstractIn the LM case, the CJEU was called to decide on whether systemic rule of law deficiencies in Poland could lead to the suspension of EU cooperation based on mutual trust, in particular under the European Arrest Warrant system. Building on its earlier decision in Aranyosi, the Court concluded that EAWs may be suspended only after the executing authority conducts a general analysis of the situation in the country concerned and an individual assessment of the specific situation of the applicant. For some, the decision was a disappointing one, as the Court failed to take a clear stance on the Polish constitutional crisis. This chapter argues, on the other hand, that the Court reached a balanced decision: while it is true that it confirmed the strict Aranyosi test, it also sent some key messages on the crucial importance of the rule of law and judicial independence for the EU and underlined the red lines of European constitutionalism. Furthermore, a different line of cases that originated from the groundbreaking decision of the Court in the ‘Portuguese judges’ case seems much more promising for the protection of EU values. Thus, rather than a constitutional moment for the Union, LM was ultimately an intermezzo between the two main acts of the rule of law play before the Court of Justice.
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Canor, Iris. "Suspending Horizontal Solange: A Decentralized Instrument for Protecting Mutual Trust and the European Rule of Law." In Defending Checks and Balances in EU Member States, 183–206. Berlin, Heidelberg: Springer Berlin Heidelberg, 2021. http://dx.doi.org/10.1007/978-3-662-62317-6_8.
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AbstractMutual trust is the basis on which the Member States’ judiciaries are expected to deal with each other in the European Union. By constitutionalizing the principle of mutual trust, the CJEU has introduced an axiological addition to the basic structure of the European Union. From a Union which concentrated on the vertical relationships between each Member State and the central Union’s institutions, the Union has turned out to be additionally preoccupied with the horizontal relationships among the Member States, which are based on what might be called a doctrine of Horizontal Solange.According to the principle of mutual trust, each Member State must presume that all other Member States are in compliance with EU law, in particular promote its values and respect European fundamental rights. This presumption, however, can be rebutted in exceptional circumstances. These exceptional circumstances are based on a two-prong test: first, the violation of the values or the fundamental rights must amount to a systemic deficiency; second, there is a need for an assessment whether the individual concerned will be the victim of this systemic deficiency.This contribution critically analyses these exceptional circumstances. Regarding the first prong, it is argued that the existence of systemic deficiencies should ideally be established by the CJEU via preliminary ruling references or via direct infringement proceedings. Alternatively, such systemic deficiencies may also be established by domestic courts in a host Member State. Regarding the second prong, it is argued that the individual test is redundant in cases where the systemic deficiency imposes challenges to the existing legal order of the Member State in question. Finally, it is argued that the suspension of mutual trust can serve as a decentralized instrument for protecting the European rule of law by pressuring the violating state to restore the rule of law.
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"2.6 Contacts entre particules." In Rhéophysique des pâtes et des suspensions, 87–89. EDP Sciences, 1999. http://dx.doi.org/10.1051/978-2-7598-0258-6.c015.
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"2.6 Contacts entre particules." In Rhéophysique des pâtes et des suspensions, 87–89. EDP Sciences, 1999. https://doi.org/10.1051/978-2-86883-401-0.c015.
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"3.2 Les interactions entre particules." In Rhéophysique des pâtes et des suspensions, 102–10. EDP Sciences, 1999. http://dx.doi.org/10.1051/978-2-7598-0258-6.c020.
Повний текст джерелаТези доповідей конференцій з теми "Suspensions de particules"
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Delplancke, Françoise. "New Polarimetric Scatterometer for Mueller Matrice Real Time Analysis of Rough Surfaces and Particle Suspensions." In Photon Correlation and Scattering. Washington, D.C.: Optica Publishing Group, 1996. http://dx.doi.org/10.1364/pcs.1996.thb.2.
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Static scalar light scattering1,2 has, since long ago, proved to be very interesting and useful in many theoretical and practical fields, related to surface and particle suspension investigation. Vectorial approaches provide even more information on the sample characteristics. While most of the theories assume spherical particles, spheroids or gaussian random surfaces with low slopes, real samples do not satisfy in general those assumptions. Scalar (i.e. intensity) measurements are unable to detect this non-ideality. So the predicted values of particle or roughness size are biased. On the contrary, vectorial (i.e. polarization) measurements 3,4,5,6 can provide ways to detect, identify and evaluate the shift from ideality (non spherical particules, porosity, high slopes...).
2
Poletkin, Kirill. "A Micromachined Contactless Suspension With Zero Spring Constant." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86465.
Повний текст джерелаАнотація:
In this paper, a micromachined contactless suspension with a zero spring constant that provides possibility to significantly increasing sensitivity of micromachined sensors is studied. Minimization of the spring constant of the contactless suspension is achieved by combining inductive and electric contactless suspensions. In particular, the conditions required to eliminate the spring constant of the suspension and achieve stable levitation of the disk shaped proof mass are obtained based on the analysis of developed mathematical model of the suspension. It is shown that such a suspension can be developed in principle.
3
Vadasz, Peter. "Nanofluids Suspensions: Possible Explanations for the Apparent Enhanced Effective Thermal Conductivity." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72258.
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The spectacular heat transfer enhancement revealed experimentally in naofluids suspensions is being investigated theoretically at the macro-scale level aiming at explaining the possible mechanisms that lead to such impressive experimental results. In particular, the possibility that Dual-Phase-Lagging heat conduction in the heterogeneous medium (nanofluid suspension) could have been the source of the excessively improved effective thermal conductivity of the suspension is shown to provide a viable explanation. The investigation of alternative possibilities is needed however prior to reaching an ultimate conclusion.
4
Vadasz, Johnathan J. "The Effect of Thermal Waves on Heat Transfer Enhancement in Nanofluid Suspensions." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59570.
Повний текст джерелаАнотація:
The spectacular heat transfer enhancement revealed experimentally in nanofluids suspensions is being investigated theoretically at the macro-scale level aiming at explaining the possible mechanisms that lead to such impressive experimental results. In particular, the anticipation that thermal wave effects via hyperbolic heat conduction could have been the source of the excessively improved effective thermal conductivity of the suspension is shown to be impossible.
5
"A polyelectrolyte-based system for separating charged particulates from aqueous biological suspensions." In 2016 ASABE International Meeting. American Society of Agricultural and Biological Engineers, 2016. http://dx.doi.org/10.13031/aim.20162452483.
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6
Keramati, Hadi, Mohammad Zabetian, Mohammad Hassan Saidi, and Ali Asghar Mozafari. "Experimental Characterization of Stabilized Suspensions Caused by Formation of Nanoparticle Halos." In ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icnmm2014-21748.
Повний текст джерелаАнотація:
Suspension flow has an important role in various applications such as paint, material and pharmaceutical industries. Settling is considered as a resisting phenomenon in the processes dealing with suspensions. Using nanoparticles as an additive to micro-particulates has been studied in limited studies. This work presents an experimental investigation to assess the effectiveness of nanoparticles in reduction of suspension settling. Microscopic imaging and transmission measurement were used to analyze the stability factors in a container. Transmission analysis revealed that presence of nanoparticles in the suspension, decreased the sedimentation rate. Microscopy showed that the settling rate decreased after adding nanoparticles. This is attributed to the repulsive forces between microparticles caused by the halos of nanoparticle. Highly charged nanoparticles segregate to region near negligibly charged microspheres because of their repulsive Coulombic interactions. Therefore, microparticles exhibit an effective charge in presence of nanoparticles. Obtained results indicate that the nanoparticles with appropriate volume fraction can stabilize suspension of microparticles and can successfully minimize the settling rate. Proposed technique can be also implemented in other applications such as heat pipes and heat transfer devices.
7
Kiger, Kenneth T., and Chunhui Pan. "SUSPENSION MECHANISMS OF SOLID PARTICULATES IN A HORIZONTAL TURBULENT CHANNEL FLOW." In Second Symposium on Turbulence and Shear Flow Phenomena. Connecticut: Begellhouse, 2001. http://dx.doi.org/10.1615/tsfp2.480.
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8
Tsai, Ming Hsiu, Weng-Sing Hwang, and Hao-Long Chen. "Variation of Macroscopic Shape and Microstructure of Silver Nanoparticle Suspension Droplets Using Ink-Jet Printing." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21441.
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Micro-interconnects of integrated circuit (IC) devices were produced using ink-jet printing of Ag nanoparticle suspensions. The macroscopic shape and microstructure of the Ag micro-dot deposits using ink-jet printing were observed using SEM (Scanning Electron Microscope) and EDS (Energy-Disperse Spectrometers). The well-dispersed suspension of nanoparticle Ag colloids, which was made up of 5–10 nm silver particulates, allows low-temperature sintering of Ag. The 50 wt% Ag suspension had a viscosity of about 7.95 cP at 25°C, which is appropriate for printing jobs. A bipolar voltage signal was used to drive a piezo-electric droplet generator and then 50–70 μm diameter droplets was dispensed on the substrate. Using SEM, a smooth deposition of drying silver dot morphology was observed. Drying the silver dots was improved by using hydrophobic substrates and a slow evaporation rate of suspensions was used to resolve an unexpected ring-shape, because both are able to control the interactions among the self-assembled Ag particles, surface tension, and the evaporation rate of droplets. Finally, the deposit/substrate composite was processed at 300°C for 60 min under a pure oxygen atmosphere to allow for the complete evaporation of the carrier and for sintering of the nano-particles, thereby yielding a finished circuit interconnect.
9
Absi, Rafik, Charlène Le Gall, Stéphane Marchandon, and Pierre-Antoine Hammad. "Interprétation des profils de concentration pour des particules de sable en suspension de différentes tailles." In Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2008. http://dx.doi.org/10.5150/jngcgc.2008.001-a.
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10
Warner, P. K., M. J. Vanderploeg, and J. E. Shannan. "An Active Suspension Strategy Using State Reconstruction." In ASME 1990 Design Technical Conferences. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/detc1990-0053.
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Abstract Many studies have shown that active suspensions using full state feedback can significantly improve the ride performance of ground vehicles. Using a seven degree of freedom vehicle model and a Kalman filter, this paper investigates the effects of reduced state feedback on active and semi-active suspension systems. Particular attention is given to control of pitch motion, which is usually considered to be the most uncomfortable of rigid body motions. The effects of phase differences between the tires is presented using frequency response surfaces. The Kalman filter, which reconstructs the state variables from a reduced set of observed variables, yields improvements in ride which compare well with the ideal active suspension without the need to measure all states. The Kalman filter system with active dampers instead of ideal actuators also yields ride improvements approaching the ideal systems.
Звіти організацій з теми "Suspensions de particules"
1
Leung-Gagné, Melanie, Jennifer McCombs, Caitlin Scott, and Daniel Losen. Pushed out: Trends and disparities in out-of-school suspension. Learning Policy Institute, September 2022. http://dx.doi.org/10.54300/235.277.
Повний текст джерелаАнотація:
During the 1990s and early 2000s, federal and state policies encouraged the implementation of zero-tolerance policies across the country, which helped fuel an overall increase in the use of suspension and expanded racial disparities in suspension. Recent changes in policy and practice have begun to shift educators away from exclusionary discipline, and we review those changes and trends in this report. We examine out-of-school suspension data from the Civil Rights Data Collection (CRDC), tracking trends over time. We also assess differences in suspension rates of students based on their race and ethnicity, school level, and disability status. We present data at national and state levels, and because out-of-school suspensions are concentrated in secondary schools, we focus our state-level findings on secondary school students. We explore the ways in which changes in suspension rates may be related to changes in policy, and we make recommendations for additional strategies to reduce school exclusion for all students, and in particular for those who have disproportionately experienced its negative effects.
2
Malghan, Subhas G., and Subhas G. Malghan. Electroacoustics for characterization of particulates and suspensions. Gaithersburg, MD: National Institute of Standards and Technology, 1993. http://dx.doi.org/10.6028/nist.sp.856.
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