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On Gibbsianness of infinite-dimensional diffusionsDereudre, David, Roelly, Sylvie January 2004 (has links)
We analyse different Gibbsian properties of interactive Brownian diffusions X indexed by the lattice $Z^{d} : X = (X_{i}(t), i ∈ Z^{d}, t ∈ [0, T], 0 < T < +∞)$. In a first part, these processes are characterized as Gibbs states on path spaces of the form $C([0, T],R)Z^{d}$. In a second part, we study the Gibbsian character on $R^{Z}^{d}$ of $v^{t}$, the law at time t of the infinite-dimensional diffusion X(t), when the initial law $v = v^{0}$ is Gibbsian.
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Propagation of Gibbsianness for infinite-dimensional gradient Brownian diffusionsDereudre, David, Roelly, Sylvie January 2004 (has links)
We study the (strong-)Gibbsian character on RZd of the law at time t of an infinitedimensional gradient Brownian diffusion / when the initial distribution is Gibbsian.
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On Gibbsianness of infinite-dimensional diffusionsRoelly, Sylvie, Dereudre, David January 2004 (has links)
The authors analyse different Gibbsian properties of interactive Brownian
diffusions X indexed by the d-dimensional lattice. In the first part of the paper, these processes are characterized as Gibbs states on path spaces. In the second part of the paper, they study the Gibbsian character on R^{Z^d} of the law at time t of the infinite-dimensional diffusion X(t), when the initial law is Gibbsian.
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AMS Classifications: 60G15 / 60G60 / 60H10 / 60J60
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Propagation of Gibbsiannes for infinite-dimensional gradient Brownian diffusionsRoelly, Sylvie, Dereudre, David January 2004 (has links)
We study the (strong-)Gibbsian character on R Z d of the law at time t of an infinitedimensional gradient Brownian diffusion / when the initial distribution is Gibbsian.
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An existence result for infinite-dimensional Brownian diffusions with non- regular and non Markovian driftRoelly, Sylvie, Dai Pra, Paolo January 2004 (has links)
We prove in this paper an existence result for infinite-dimensional stationary interactive Brownian diffusions. The interaction is supposed to be small in the norm ||.||∞ but otherwise is very general, being possibly non-regular and non-Markovian. Our method consists in using the characterization of such diffusions as space-time Gibbs fields so that we construct them by
space-time cluster expansions in the small coupling parameter.
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STUDY OF CHARACTERIZATION OF SUBMICRON COAL PARTICLES DISPERSED IN AIR AND CAPTURE OF COAL PARTICLES BY WATER DROPS IN A SCRUBBING COLUMNChakravorty, Utshab 01 January 2012 (has links)
Present day water spray based dust removal technologies do not effectively remove respirable submicron coal and silica dust particles in the underground coal mines causing Coal worker’s pneumoconiosis (CWP). The objective of this research was to study the electrostatic charges present in the airborne coal dust in order to develop efficient water spraying based dust removal technology where water drops charged using ionic compounds and surfactants would be used to capture the oppositely charged coal particles. In an experimental scrubbing column, coal particles dispersed in an air stream by a Fluidized Bed Aerosol Generator were captured by water drops sprayed by an atomizer. Characterization studies performed using an Aerodynamic Particle Sizer and Aerosol Electrometer showed that airborne coal particles have a significant amount of positive charge with an average of 140 elementary units of charge. The capture efficiencies of the water drops evaluated were found to be higher than those predicted by previously determined mathematical models. It was predicted that apart from the effects of Brownian diffusion, interception and impaction, the effect of Coulombic attraction was present and the charge of the water drops was predicted to be between - 2 x 10-6 C and -2 x 10-4 C.
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Etude d' un système biomimétique simple : diffusion brownienne et mobilité électrophorétique d' une protéine membranaire modèle insérée dans une bicouche lipidique supportéeHarb, Frédéric 27 November 2012 (has links)
Après le génome, le nouveau défi est celui du protéome. Nous avons progressé vers la mise au point de la séparation électrophorétique des protéines membranaires dans un milieu qui leur conviendrait, type bicouche lipidique supportée. La grandeur principale, mesurée par FRAPP, a été le coefficient de diffusion de lipides ainsi que des protéines. L'étude du comportement de la bicouche supportée a permis de mettre en évidence, pour certains supports et dans certaines conditions de température, la formation d'une phase ondulée (ou ripple) malgré la proximité du support. La diminution de la portée des interactions coulombiennes par adjonction de sel se traduit par une augmentation de plusieurs ordres de grandeur du coefficient de diffusion, approchant au final le comportement d'une bicouche libre, tout en conservant les étapes caractéristiques de la transition gel/fluide. L'ordre de grandeur de ces énergies d'interactions a été estimé à partir des courbes D= f(T) et validé par une étude préliminaire originale de DSC sur des bicouches lipidiques supportées. L'α-Hémolysine s'insère spontanément sous forme d'un pore heptamérique dans nos bicouches supportées et diffuse librement. En l'incubant en phase mixte (zones gel+ zones fluide), nous observons la formation de complexes de protéines. La dépendance du coefficient de diffusion avec la taille de l'objet est en 1/R2, R étant le rayon équivalent de la partie insérée de l'objet. L'application d'un champ électrique montre un transport électrophorétique dont la direction et l'importance sont modulées par la charge de l'objet. La mobilité électrophorétique varie également en 1/R2. / After the genome, the new challenge is the proteome. We have progressed toward electrophoretic separation of membrane proteins in a medium that they love, a supported lipid bilayer. The main parameter, measured by FRAPP, was the diffusion coefficient of different objects (lipids, proteins). Studying bilayer behaviour has showed that, on particular supports and in a given temperature range, ripple phase can exist, despite the proximity of the support. Adding salt decreases coulombic interactions which turns to increase the diffusion coefficient over several orders of magnitude, reaching the value for a free-standing bilayer in the fluid phase, meanwhile the main characteristic steps of the global gel/fluid transition are still observed. Estimation of the value of the interaction energy has been made and compared to results of a preliminary DSC study. α-Hémolysin self-inserts spontaneously as an heptameric pore in supported bilayers and diffuses freely. Incubating in a gel/fluid mixture leads to protein complex formation. Diffusion varies with size as 1/R2, R being the equivalent radius of the inserted part of the object. Applying an electric field results in an electrophoretic motion where direction and magnitude are modulated by the charge of the object. Electrophoretic mobility varies also as 1/R2. Size dependence, magnitude of mobilities and a simple building protocol allow to hope carrying out soon a real electrophoretic separation of a protein mixture.
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[en] NUMERICAL SIMULATION OF WAX DEPOSITION IN PETROLEUM LINES: ASSESSEMENT OF MOLECULAR DIFFUSION AND BROWNIAN DIFFUSION MECHANISMS / [pt] SIMULAÇÃO NUMÉRICA DA DEPOSIÇÃO DE PARAFINA EM DUTOS DE PETRÓLEO: AVALIAÇÃO DOS MECANISMOS DE DIFUSÃO MOLECULAR E DIFUSÃO BROWNIANALUIS RENATO MINCHOLA MORAN 20 August 2008 (has links)
[pt] Deposição de parafinas é um dos mais críticos problemas
operacionais no transporte de óleo cru, nos dutos que
operam em ambientes frios. Portanto, uma predição acurada
da deposição de parafinas é crucial para o projeto
eficiente de linhas submarinas. Infelizmente, a deposição
de parafinas é um processo complexo e os mecanismos de
deposição ainda não são bem compreendidos. Visando
identificar a importância relativa dos diferentes
mecanismos de deposição, dois deles foram investigados:
Difusão Molecular e Browniana. Para determinar a
quantidade de depósito, as equações de conservação de
massa, quantidade de movimento linear, energia,
concentração da mistura e concentração da parafina fora
da solução foram resolvidas numericamente pelo método de
volumes finitos. Um sistema de coordenadas móveis não
ortogonais que se adapta a interface do depósito
da parafina foi empregado. Apesar da obtenção de uma
concordância razoável do perfil de depósito, obtido com os
mecanismos selecionados no regime laminar, com
resultados disponíveis na literatura, uma discrepância
significativa foi observada durante o transiente. O emprego
do mecanismo de difusão browniana levou a uma
pequena melhora na predição da solução nas regiões sub-
resfriadas. A influência do regime turbulento como o
mecanismo de difusão molecular também foi investigado,
empregando o modelo de turbulência para baixo Reynolds K-
(Taxa de dissipação viscosa da energia cinética
turbulenta).Os resultados obtidos apresentaram coerência
física, com uma taxa menor de aumento do depósito com o
tempo, pois a região próxima à interface com temperatura
abaixo da temperatura de aparecimento de cristais é menor
no regime turbulento. / [en] Wax deposition is one of the major critical operational
problems in crude oil pipelines operating in cold
environments. Therefore, accurate prediction of the
wax deposition is crucial for the efficient design of
subsea lines. Unfortunately, wax deposition is a complex
process for which the mechanisms are still not fully
understood. Aiming at the identification of the relative
importance of the different deposition mechanisms, two of
them were investigated: Molecular and Brownian
Diffusion. To determine the amount of deposit, the
conservation equations of mass, momentum, energy,
concentration of the mixture and wax concentration
outside the solution were numerically solved with the
finite volume method. A non-orthogonal moving coordinate
system that adapts to the wax interface deposit geometry
was employed. Although for the laminar regime, the
deposition profile predicted with the selected deposition
mechanisms presented a reasonable agreement with available
literature results for the steady state regime, a
significant discrepancy was observed during the transient.
The employment of the Brownian diffusion mechanism led to
only a small improvement in the transient solution
prediction in sub-cooled regions. The influence of the
turbulent regime with the Molecular diffusion mechanism was
also investigated by employing the Low Reynolds
ê−turbulence model. The results obtained were physically
coherent, presenting a smaller deposit thickness, since the
region with temperature below the wax appearance
temperature is smaller in the turbulent regime.
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An evanescent-wave based particle image velocimetry techniqueLi, Haifeng 17 November 2008 (has links)
Quantifying the velocity field near the wall in microfluidic devices is important because surface effects become significant at micro- to nanometer scales. Recent studies have suggested that the "no-slip" boundary condition breaks down in microscale flows of Newtonian liquids, where the amount of slip is usually extrapolated from velocity components measured far from the wall. This doctoral thesis presents a new technique, multilayer nano-particle image velocimetry (MnPIV), for measuring the tangential velocity components at different distances from and within about 500 nm of the wall and its application to measuring slip.
The feasibility of MnPIV was demonstrated using synthetic images of plane Couette flow incorporating Brownian diffusion and imaging noise. The errors in MnPIV data were then quantified with Brownian dynamics simulations. Calibration experiments were used to correlate the image intensity of the tracer to its distance from the wall z.
Multilayer nPIV was then used to determine the z-positions and distribution of the particles for z < 500 nm in experimental studies of microscale Poiseuille flow. The tracers were divided into three distinct layers based on their image intensities, and the average velocity of each layer was placed at the average z-position sampled by the particles in that layer. The resultant velocity gradients were within 6% on average of analytical predictions for 2D Poiseuille flow. Finally, the results of MnPIV studies of aqueous solutions flowing through microchannels with hydrophilic and hydrophobically-coated fused silica surfaces suggest that if the slip lengths are nonzero for both of these surfaces, they are less than the uncertainty in these results, or 27 nm and 31 nm for the hydrophilic and hydrophobic channels, respectively.
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Protein dynamics: a study of the model-free analysis of NMR relaxation datad'Auvergne, Edward J. Unknown Date (has links) (PDF)
The model-free analysis of NMR relaxation data, which is widely used for the study of protein dynamics, consists of the separation of the Brownian rotational diffusion from internal motions relative to the diffusion frame and the description of these internal motions by amplitude and timescale. Through parametric restriction and the addition of the Rex parameter a number of model-free models can be constructed. The model-free problem is often solved by initially estimating the diffusion tensor. The model-free models are then optimised and the best model is selected. Finally, the global model of all diffusion and model-free parameters is optimised. These steps are repeated until convergence. This thesis will investigate all aspects of the model-free data analysis chain. (For complete abstract open document)
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