WorldCat Identities

Dean, David S.

Overview
Works: 38 works in 61 publications in 2 languages and 185 library holdings
Genres: Academic theses  Instructional films  Nonfiction films  Conference papers and proceedings 
Roles: Editor, Author, Thesis advisor, Other, Opponent
Publication Timeline
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Most widely held works by David S Dean
Electrostatics of soft and disordered matter by David S Dean( )

12 editions published between 2013 and 2014 in English and held by 130 WorldCat member libraries worldwide

Annotation
A ballistic technique for accurate measurement of total impulse and thrust of rocket motors with short burning times by David Stanley Dean( Book )

3 editions published in 1976 in English and held by 5 WorldCat member libraries worldwide

A method is described whereby a rocket motor impulse lasting a few milliseconds may be spread over a longer period to allow it to be recorded by conventional methods with an accuracy of plus/minus 0.2%. Instantaneous thrust is also recorded with an accuracy of plus/minus 2%. Most of the problems encountered with a ballistic pendulum are avoided and only the static calibration of a load cell is required before use. (Author)
The design of a stand to measure thrust alignment in solid propellent rocket motors by D. S Dean( Book )

4 editions published in 1971 in English and held by 4 WorldCat member libraries worldwide

A thrust stand and calibration system is described by which the direction of the thrust vector of a rocket motor can be resolved over consecutive 50 msec intervals to within 0.7 milliradian. The angle of the overall impulse vector can be measured to better than 0.5 milliradian. Methods of improving the accuracy of the system are discussed
Stochastic dynamics by David Stanley Dean( )

3 editions published in 1993 in English and held by 3 WorldCat member libraries worldwide

Etats métastables dans les systèmes vitreux : des verres de spins aux milieux granulaires by Alexandre Lefevre( Book )

2 editions published in 2003 in French and held by 2 WorldCat member libraries worldwide

Aspects of one-dimensional Coulomb gases( )

1 edition published in 2014 in English and held by 2 WorldCat member libraries worldwide

Optimal least-squares estimators of the diffusion constant from a single Brownian trajectory by Denis Boyer( )

1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide

Transport and dispersion across wiggling nanopores by Sophie Marbach( )

1 edition published in 2018 in English and held by 2 WorldCat member libraries worldwide

Dynamique de marcheurs aléatoires en interaction : applications aux particules browniennes autogravitantes, à la condensation de Bose-Einstein, à la turbulence en déclin et aux marcheurs aléatoires en présence de pièges by Julien Sopik( Book )

2 editions published in 2007 in French and held by 2 WorldCat member libraries worldwide

This thesis is dedicated to the study of the dynamical properties of various systems of interacting random walkers. In the first part of this manuscript, we study a model of self-gravitating Brownian particles. In this model, the particles evolve at fixed temperature. This corresponds to a canonical description of self-gravitating systems. When the temperature is above a certain critical temperature, metastable equilibrium states exist. By contrast, below this critical temperature, the system collapses and forms a Dirac peak. It has been shown that the model of self-gravitating Brownian particles shares numerous analogies with the chemotaxis of biological populations. In this thesis, we generalize these results to the multi-component case, in which the particles can have different masses. In addition, we study the phase transitions between gaseous states and condensed states for a model of self-gravitating Brownian particles (or its biological analog) around a central body. Moreover, we show that the model of self-gravitating Brownian particles exhibits many analogies with the Bose-Einstein condensation of free bosons strongly coupled with a thermal bath. This model corresponds to a canonical description (fixed temperature) of the Bose-Einstein condensation. The coupling between a thermal bath and a system of free bosons induces a effective interaction between the bosons. This one forces them to condensate in their fundamental state when the temperature is less than a certain critical temperature. We then study the solutions of the bosonic Fokker-Planck equation of this problem which leads to the formation of a Dirac peak, modeling the condensate. In the second part of this thesis, we study the freely decaying two-dimensional turbulence. Two-dimensional turbulence has the striking property to generate a set of coherent structures called vortices. If the turbulent system evolves freely (without any external forcing), the turbulent fluid decays due to the merging processes of like-sign vortices. Some studies have shown that two-body merging processes are dominant for large vortex densities whereas there are inefficient at very low density: in this case, the evolution is dominated by three-body processes
Etude de systèmes de spins complexes ou désordonnés : analogies avec la transition vitreuse structurelle by Raphaël Cherrier( Book )

2 editions published in 2003 in French and held by 2 WorldCat member libraries worldwide

Interactions induites par un environnement fluctuant by Vincent Démery( Book )

2 editions published in 2012 in French and held by 2 WorldCat member libraries worldwide

The interaction between two objects is, most of the time, carried by their environment. The properties of the environment allow one to compute the features of the interaction felt between the objects. This computation is presented in this thesis in two different situations. The first part deals with the effect of a fluctuating environment on a moving object. The mean force is computed for an object moving at constant speed and coupled linearly or quadratically to its environment. In the last case, the drag force is only due to fluctuations and is thus a Casimir drag. The diffusion coefficient is then computed for a weak linear coupling, generalising known results for diffusion in a quenched potential. The computations are valid for a very general form of environment, and can be applied to proteins diffusing in fluctuating lipid membranes. The second part is about systems of ions between two charged plates. The first studied system is a one-dimensionnal model of ionic liquid on a lattice for which the pressure and the charge density can be computed exactly. The second system contains polarizable ions; the effects of polarisability on the pressure and the charge density are looked at in two limiting cases
Electroperméabilisation de systèmes modèles by Thomas Portet( Book )

2 editions published in 2010 in French and held by 2 WorldCat member libraries worldwide

L'électroperméabilisation est un procédé fondé sur l'application d'impulsions électriques qui peuvent induire une perméabilisation réversible de la membrane plasmique de cellules vivantes. En d'autres termes: si vous soumettez une cellule à des impulsions électriques d'amplitude et de durée judicieusement choisies, vous serez alors en mesure d'introduire dans son cytoplasme des molécules d'intérêt autrement incapables de traverser son enveloppe externe, et ce sans affecter sa viabilité. Cette technique a donné lieu à diverses applications, notamment dans le cadre de la lutte contre le cancer ou des thérapies géniques. Comportant moins de risques que les méthodes de transfection virales ou chimiques, son usage est de plus en plus répandu dans la communauté médicale. Cependant, les processus de réorganisation de la membrane, au niveau microscopique, sont encore méconnus et sujets à débat. Une meilleure description de ces phénomènes permettrait d'améliorer l'efficacité et la sécurité des protocoles de traitement. Une stratégie possible pour accroître notre compréhension de l'électroperméabilisation consiste en la réalisation d'expériences sur des systèmes modèles. Cette thèse aborde l'étude de l'effet d'impulsions électriques perméabilisantes de longue durée (quelques millisecondes) sur des systèmes lipidiques artificiels, des vésicules unilamellaires géantes. Il est décrit comment ce travail sur systèmes modèles a contribué à améliorer notre compréhension fondamentale de l'électroperméabilisation, mais aussi comment il a donné lieu à deux catégories d'applications: le chargement de vésicules avec des macromolécules et la mesure de grandeurs physiques caractéristiques des bicouches lipidiques, les tensions de bord. Ces recherches comportent aussi un aspect de modélisation de l'entrée dans des cellules électroperméabilisées de différentes molécules, via la résolution numérique d'équations aux dérivées partielles gouvernant l'évolution de leur concentration. Cette partie apporte des éléments de réponse visant à expliquer les différences observées expérimentalement entre le transfert de petites et de macro-molécules
David Dean : the spread offense quick passing game( Visual )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

Coach David Dean shows how to make offense look complex and score
Interactions induites par un environnement fluctuant by Vincent Démery( )

1 edition published in 2012 in French and held by 1 WorldCat member library worldwide

L'interaction entre deux objets est, le plus souvent, transportée par leur environnement. Les caractéristiques de ce dernier permettent de calculer les propriétés de l'interaction ressentie entre ces objets. Cette thèse présente ce calcul dans deux situations différentes. La première partie concerne l'effet d'un environnement fluctuant sur le mouvement d'un seul objet. La force moyenne est calculée pour un objet avançant à vitesse constante et couplé linéairement puis quadratiquement à son environnement. Dans ce dernier cas le frottement ressenti est entièrement dû aux fluctuations : il s'agit d'un frottement de Casimir. Le coefficient de diffusion est calculé pour un couplage linéaire faible, généralisant au passage des résultats connus pour la diffusion dans un potentiel gelé. Ces calculs sont faits pour une classe très générale d'environnements, et peuvent être appliqués à la diffusion de protéines dans des membranes lipidiques fluctuantes. La deuxième partie traite de systèmes contenant des ions entre deux plaques chargées. Le premier système étudié est un modèle unidimensionnel de liquide ionique sur réseau pour lequel la pression et la densité de charge peuvent être calculées exactement. Le deuxième système est composé d'ions polarisables ; les effets de la polarisabilité sur la pression et la densité de charge y sont étudiés dans deux limites distinctes
Étude de modèles dynamiques pour la transition vitreuse by Clément Touya( Book )

in French and held by 1 WorldCat member library worldwide

This thesis details the study of dynamical models in the framework of the glass transition. A full understanding of this phenomenon is still eluding modern physics. By means of toy model's, we thus study some properties which are typical of this transition. For example, when you come close to the transition, the relaxation dynamic of the system slows down dramatically. In order to study those systems, truly out of equilibrium, the main paradigm we use in this thesis is the disordered systems. Indeed, under some circumstances, an analogie exists between a model with disorder, and a real system which exhibit a true structural glass transition. If the interaction is short ranged, the relaxation time can be linked to the diffusion constant of the medium. If it vanishes, we have then a crossover between a diffusive and a sub-diffusive regime. This dynamical transition is then similar to the glass transition. In this spirit, we focused on the study of dipoles diffusing in a random electrical field. In this model, the disorder is given by the random electrical potential which gives birth to the field, and the most natural choice is then to take a Gaussian statistic for the potential. In an adiabatique limit, where the dipole adapt instantaneously to the local field, the model just reduces to a particle diffusing in a squared Gaussian effective potential. we show here, exactly in one dimension, and through a renormalization group analysis in higher dimension, that the diffusion constant vanishes for a critical non-zero temperature where the dynamic get frozen like in real glass. We show also that beyond this adiabatique approximation, the transition remain at the same critical temperature in one dimension
Phase diagram of a bulk 1d lattice Coulomb gas( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Sample-to-sample fluctuations of electrostatic forces by generated by quenched charge disorder by David S Dean( )

1 edition published in 2011 in English and held by 1 WorldCat member library worldwide

Sample-to-sample torque fluctuations in a system of coaxial randomly charged surfaces( )

1 edition published in 2012 in English and held by 1 WorldCat member library worldwide

Polarizable randomly charged dielectric objects have been recently shown to exhibit long-range lateral and normal interaction forces even when they are effectively net-neutral. These forces stem from an interplay between the quenched statistics of random charges and the induced dielectric image charges. This type of interaction has recently been evoked to interpret measurements of Casimir forces in vacuo, where a precise analysis of such disorder-induced effects appears to be necessary. Here we consider the torque acting on a randomly charged dielectric surface (or a sphere) mounted on a central axle next to another randomly charged surface and show that although the resultant mean torque is zero, its sample-to-sample fluctuation exhibits along-range behavior with the separation distance between the juxtaposed surfaces and that, in particular, its root-mean-square value scales with the total area of the surfaces. Therefore, the disorder-induced torque between tworandomly charged surfaces is expected to be much more pronounced than the disorder-induced lateral force and may provide an effective way to determine possible disorder effects in experiments, in a manner that is independent of the usual normal force measurement
Tracking nonequilibrium in living matter and self-propelled systems by Etienne Fodor( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Living systems operate far from equilibrium due to the continuous injection of energy provided by ATP supply. The dynamics of the intracellular components, such as proteins, organelles and cytoskeletal filaments, are driven by both thermal equilibrium fluctuations, and active stochastic forces generated by the molecular motors. Tracer particles are injected in living cens to study these fluctuations. To sort out genuine nonequilibrium fluctuations from purely thermal effects, measurements of spontaneous tracer fluctuations and of response are combined. We theoretically rationalize the observed fluctuations with a phenomenological model. This model, in turn, allows us to quantify the time, length and energy scales of the active fluctuations in three different experimental systems: living melanoma cells, living mouse oocytes, and epithelial tissues. Self-propelled particles are able to extract energy from their environment to perform a directed motion. Such a dynamics lead to a rich phenomenology that cannot be accounted for by equilibrium physics arguments. A striking example is the possibility for repulsive particles to undergo a phase separation, as reported in both experimental and numerical realizations. On a specific model of self-propulsion, we explore how far from equilibrium the dynamics operate. We quantify the breakdown of the irreversibility of the dynamics, and we delineate a bona fide effective equilibrium regime. Our insight into this regime is based on the analysis of fluctuations and response of the particles
Écoulements au voisinage d'interfaces molles : les rôles de l'élasticité, la capillarité & les fluctuations by Vincent Bertin( )

1 edition published in 2021 in English and held by 1 WorldCat member library worldwide

In this manuscript, we study flows in the vicinity of soft interfaces through various systems. In a first part, we focus on elastohydrodynamic lubrication, and analyze the confined motion of a rigid sphere moving close to a soft surface. The hydrodynamic interactions between an oscillating sphere and the deformation of the surface allow us to characterize without contact the complex mechanical response of materials, such as viscoelasticity, poroelasticity or capillarity. Theoretical results are confronted with colloidal-probe atomic force microscopy experiments, allowing us to measure the rheology of elastomers and the surface tension of liquid-air interfaces in the presence of impurities. Then, we calculate the forces and torques that apply on spheres that are free to move and rotate in all directions. The elastohydrodynamic lift force, measured experimentally, is in agreement with theoretical predictions for small surface deformations. In a second part, we focus on the dynamics of thin films. Through theoretical and experimental work on the capillary leveling of thin polymer films, we analyze the dynamics of films resting on an elastic substrate, bilayer films and freestanding films. A last part is dedicated to the diffusion of spheres in shear flows and near a wall. We analyze the enhancement of the effective diffusion coefficient induced by the coupling between diffusion and advection. Particular interest is given to the dynamics at short times compared with the diffusion time and to the interactions of the particles with the wall
 
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Electrostatics of soft and disordered matter
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Alternative Names
D S Dean wetenschapper

David Dean researcher

Dean, David

Dean, David Stanley

Languages
English (31)

French (12)