Relevant bibliographies by topics / Isotropic diffusion

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Isotropic diffusion'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Isotropic diffusion"

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Wong, Eric C., Robert W. Cox, and Allen W. Song. "Optimized isotropic diffusion weighting." Magnetic Resonance in Medicine 34, no. 2 (1995): 139–43. http://dx.doi.org/10.1002/mrm.1910340202.

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Klemp, Joseph B. "Damping Characteristics of Horizontal Laplacian Diffusion Filters." Monthly Weather Review 145, no. 11 (2017): 4365–79. http://dx.doi.org/10.1175/mwr-d-17-0015.1.

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Horizontally diffusive computational damping terms are frequently employed in 3D atmospheric simulation models to enhance stability and to suppress small-scale noise. In configuring these filters, it is desirable that damping effects are concentrated on the smaller-scale disturbances close to the grid scale and that the dissipation is spatially isotropic. On Cartesian meshes, the isotropy of the damping can vary greatly depending on the numerical formulation of the horizontal filter. The most isotropic behavior appears to result from recursive application of a 2D Laplacian that combines both along-axis and diagonal contributions. Also, the recursive application of 1D Laplacians in each coordinate direction provides better isotropy than the recursive application of the 2D Laplacian represented with a five-point operator. Increased isotropy also permits a larger maximum diffusivity, which may be beneficial in certain filter applications. On hexagonal and triangular meshes, Laplacian operators exhibit excellent isotropy, owing to the more isotropic nature of the meshes. However, previous research has established that straightforward application of the Laplacian may yield a diffusion operator that damps both resolved physical modes and unresolved high-wavenumber (aliased) modes, but it does not converge to the proper analytic behavior. Special averaging is then required to recover an accurate representation for the Laplacian. A consequence of this averaging is that the resulting filters do not act on the aliased modes (the checkerboard mode in particular) and thus employing the unaveraged diffusion operators may be preferable. The damping characteristics and stability constraints are derived for both the unaveraged and averaged Laplacian filters for C-grid staggering on these meshes.
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Kumar, Rajneesh, and Vandana Gupta. "Plane wave propagation in an anisotropic dual-phase-lag thermoelastic diffusion medium." Multidiscipline Modeling in Materials and Structures 10, no. 4 (2014): 562–92. http://dx.doi.org/10.1108/mmms-01-2014-0004.

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Purpose – The purpose of this paper is to depict the effect of thermal and diffusion phase-lags on plane waves propagating in thermoelastic diffusion medium with different material symmetry. A generalized form of mass diffusion equation is introduced instead of classical Fick's diffusion theory by using two diffusion phase-lags, one phase-lag of diffusing mass flux vector, represents the delayed time required for the diffusion of the mass flux and the other phase-lag of chemical potential, represents the delayed time required for the establishment of the potential gradient. The basic equations for the anisotropic thermoelastic diffusion medium in the context of dual-phase-lag heat transfer (DPLT) and dual-phase-lag diffusion (DPLD) models are presented. The governing equations for transversely isotropic and isotropic case are also reduced. The different characteristics of waves like phase velocity, attenuation coefficient, specific loss and penetration depth are computed numerically. Numerically computed results are depicted graphically for anisotropic, transversely isotropic and isotropic medium. The effect of diffusion and thermal phase-lags are shown on the different characteristic of waves. Some particular cases of result are also deduced from the present investigation. Design/methodology/approach – The governing equations of thermoelastic diffusion are presented using DPLT model and a new model of DPLD. Effect of phase-lags of thermal and diffusion is presented on different characteristic of waves. Findings – The effect of diffusion and thermal phase-lags on the different characteristic of waves is appreciable. Also the use of diffusion phase-lags in the equation of mass diffusion gives a more realistic model of thermoelastic diffusion media as it allows a delayed response between the relative mass flux vector and the potential gradient. Originality/value – Introduction of a new model of DPLD in the equation of mass diffusion.
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Liu, Cui Yin, Chun Yu Zhang, Hong Zhao Yuan, and Xi Long Qu. "The Comparison of Isotropic and Anisotropic Diffusion Techniques for Image Denoising." Applied Mechanics and Materials 34-35 (October 2010): 557–61. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.557.

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The non-linear diffusion techniques were proposed for overcome the linear diffusion defaults. The linear diffusion was a homogeneous diffusivity with a constant conductivity. In this diffusion process, the noise and the edges were smoothed in the image. In order to prevent the edge from being smoothed during the denoising, the nonlinear diffusion was proposed by Pereona and Malik. In this method, noise was smoothed Simultaneously with the edges blurred. In diffusion processes, the conductivity is dependent on the image local information. We analyzed the ineffectiveness of isotropic and extended the work into the tensor-based anisotropic diffusion. It would be desirable to rotate the flux towards the orientation of interesting features. We compare the difference of isotroic linear and non-linear anisotropic diffusivity, and considere how to design non-linear anisotropic conductivity based on the different requires of the image filtering.
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Aardema, T. G., R. M. S. Knops, S. P. L. Nijsten, K. A. H. van Leeuwen, J. P. J. Driessen, and H. C. W. Beijerinck. "Transverse Diffusion in Isotropic Light Slowing." Physical Review Letters 76, no. 5 (1996): 748–51. http://dx.doi.org/10.1103/physrevlett.76.748.

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Kumar, Rajneesh, and Vijay Chawla. "Three-dimensional fundamental solution in transversely isotropic thermoelastic diffusion material." Theoretical and Applied Mechanics 39, no. 2 (2012): 165–84. http://dx.doi.org/10.2298/tam1202163k.

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The aim of the present investigation is to study the fundamental solution for three dimensional problem in transversely isotropic thermoelastic diffusion medium. After applying the dimensionless quantities, two displacement functions are introduced to simplify the basic threedimensional equations of thermoelastic diffusion with transverse isotropy for the steady state problem. Using the operator theory, we have derived the general expression for components of displacement, mass concentration, temperature distribution and stress components. On the basis of general solution, three dimensional fundamental solutions for a point heat source in an infinite thermoelastic diffusion media is obtained by introducing four new harmonic functions. From the present investigation, a special case of interest is also deduced to depict the effect of diffusion.
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Martinez, Hernan L., Juan M. R. Parrondo, and Katja Lindenberg. "Diffusion on deterministic and quasirandom models of diffusion-limited aggregates. I. Isotropic diffusion." Physical Review E 48, no. 5 (1993): 3545–55. http://dx.doi.org/10.1103/physreve.48.3545.

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Dai, F., and K. R. Rajagopal. "Diffusion of fluids through transversely isotropic solids." Acta Mechanica 82, no. 1-2 (1990): 61–98. http://dx.doi.org/10.1007/bf01173740.

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ZENG, QIUHUA, and HOUQIANG LI. "DIFFUSION EQUATION FOR DISORDERED FRACTAL MEDIA." Fractals 08, no. 01 (2000): 117–21. http://dx.doi.org/10.1142/s0218348x00000123.

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The movement of the fractal Brownian particle in isotropic and homogeneous two-dimensional assembling fractal spaces is studied by the standard diffusion equation on fractals, and we find that particle movement belongs to the anomalous diffusion. At the same time, by discussing the defectiveness of earlier proposed equations, a general form of analytic fractional diffusion equation is proposed for description of probability density of particles diffusing on fractal geometry at fractal time, and the solution connects with the ordinary solutions in the normal space time limit.
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,, Iryanto, Friska Fristella, and Putu Harry Gunawan. "Pendekatan Numerik pada model Isotropic dan Anisotropic diffusion dalam Pengolahan Citra." Indonesian Journal on Computing (Indo-JC) 1, no. 2 (2016): 83. http://dx.doi.org/10.21108/indojc.2016.1.2.102.

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<p>Tujuan dari penulisan ini adalah untuk mempelajari model anisotropic diffusion dan persamaan panas isotropic diffusion pada pengolahan citra. Model anisotropic diffusion disebut sebagai persamaan Perona-Malik yang memiliki berbagai fungsi fluks dalam persamaannya. Untuk menghampiri solusi persamaan anisotropic dan isotropic diffusion secara numerik, metode beda hingga digunakan dalam mendiskritkan domain spasial dan waktu dari model yang digunakan. Hasil numerik menggunakan model anisotropic diffusion menghasilkan gambar yang lebih tajam dibandingkan menggunakan model persamaan panas, dalam hal untuk mempertahankan garis tepi pada citra. Citra yang digunakan dalam penelitian ini adalah citra MRI dan Lena. Hasil pengukuran menggunakan profil histogram dan Peak Signal to Noise Ratio (PSNR) untuk melihat perbedaan masing-masing hasil simualsi numerik. PSNR pada citra MRI dengan menggunakan model isotropic dan anisotropic diffusion berturut-turut didapatkan sebesar 6.1745 dB, dan 6.1833 dB.</p>
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Dissertations / Theses on the topic "Isotropic diffusion"

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Fredriksson, Lars. "Normal and anomalous diffusion." Thesis, Karlstads universitet, Fakulteten för teknik- och naturvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-6561.

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Diffusion can be classified as either normal or anomalous. A variety of experimental systems are evaluated to classify diffusion. Potential regressions and step size distributions are analysed. Nor-mal diffusion holds except where flocculation takes place, or where concentrations of cationic starches are high or with cationic starches and latex together. In these cases, subdiffusion takes place. Furthermore, limiting values are used to calculate diffusion coefficients. Diffusion of non-spherical particles is covered as well, here tested on microcrystalline cellulose.
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Bajaj, Sahil, John R. Vanuk, Ryan Smith, Natalie S. Dailey, and William D. S. Killgore. "Blue-Light Therapy following Mild Traumatic Brain Injury: Effects on White Matter Water Diffusion in the Brain." FRONTIERS MEDIA SA, 2017. http://hdl.handle.net/10150/626295.

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Mild traumatic brain injury (mTBI) is a common and often inconspicuous wound that is frequently associated with chronic low-grade symptoms and cognitive dysfunction. Previous evidence suggests that daily blue wavelength light therapy may be effective at reducing fatigue and improving sleep in patients recovering from mTBI. However, the effects of light therapy on recovering brain structure remain unexplored. In this study, we analyzed white matter diffusion properties, including generalized fractional anisotropy, and the quantity of water diffusion in isotropic (i.e., isotropic diffusion) and anisotropic fashion (i.e., quantitative anisotropy, QA) for fibers crossing 11 brain areas known to be significantly affected following mTBI. Specifically, we investigated how 6 weeks of daily morning blue light exposure therapy (compared to an amber-light placebo condition) impacted changes in white matter diffusion in individuals with mTBI. We observed a significant impact of the blue light treatment (relative to the placebo) on the amount of water diffusion (QA) for multiple brain areas, including the corpus callosum, anterior corona radiata, and thalamus. Moreover, many of these changes were associated with improvements in sleep latency and delayed memory. These findings suggest that blue wavelength light exposure may serve as one of the potential non-pharmacological treatments for facilitating structural and functional recovery following mTBI; they also support the use of QA as a reliable neuro-biomarker for mTBI therapies.
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Dezert, Romain. "Theoretical study of isotropic Huygens particles for metasurfaces." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0415.

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Les avancées récentes en optique à l'échelle nanométrique ont donné naissance à une nouvelle branche de la nano-photonique visant à manipuler la diffusion de nanoparticules, avec de nombreuses applications potentielles en communication optique, en photovoltaïque, pour le développement de nano-antennes, de capteurs, etc. La réponse de nano-diffuseurs est souvent caractérisée en termes de multipoles électromagnétiques dont les ajustements constituent un moyen efficace pour façonner à souhait les diagrammes de rayonnement de particules. En particulier, des interférences destructives entre multipoles de parité spatiale opposée peuvent être exploitées pour annuler la rétro-diffusion d’objets de petites tailles. Cet effet, théoriquement prédit il y a 30 ans par Milton Kerker, permet aujourd’hui de concevoir des particules sub-longueur d'onde diffusant la lumière uniquement vers l'avant, partageant ainsi les principales caractéristiques des sources théoriques fictives utilisées dans le principe de Huygens-Fresnel. Une fois assemblées en réseau périodique bidimensionnel, ces particules, appelées "sources de Huygens", offrent des opportunités uniques dans le développement de composants optiques plats et ultrafins, appelés "métasurfaces", permettant un contrôle arbitraire de la phase, de l'amplitude et/ou de la polarisation de faisceaux lumineux. Ainsi, au cours des dernières années, les métasurfaces de Huygens ont été très largement explorées comme alternative à l’optique traditionnelle pour la conception de surfaces remplissant les fonctions de lentilles, de déflecteurs de faisceau, de vortex optique, d’hologrammes ou d’absorbeurs parfaits. Ces travaux se sont notamment appuyés sur des sources de Huygens anisotropes pouvant être obtenues par les technologies dites ‘’top-down’’. Contrairement aux approches étudiées jusqu'à présent, cette thèse porte sur l'étude de sources de Huygens isotropes. Nous étudions en particulier des particules homogènes, composites ou de types coeur-coquille pour atteindre le régime de Kerker. Nous démontrons la possibilité de façonner le front d'onde de faisceaux optiques en utilisant des systèmes sphériques constitués d’amas de particules diélectriques. Nous présentons également un formalisme multipolaire pouvant être exploité pour optimiser l'absorption de surface de Huygens. Comme fil conducteur de notre projet, les objets que nous étudions sont adaptés aux technologies ascendantes (dite "bottom-up") et pourraient de manière réaliste être obtenue par synthèse colloïdale et procédés d’auto-assemblage, offrant ainsi une alternative aux métasurfaces classiquement obtenues par lithographie<br>Recent developments in optics at the nanoscale have given rise to a new branch of nano-photonics aimed at manipulating the scattering of nanoparticles, with numerous potential applications in optical communication, nano-antennas, photovoltaics, sensing, etc. The response of nano-scatterers is often characterized in terms of electromagnetic multipoles. Tailoring these multipoles represents an efficient scheme to engineer three-dimensional radiation diagrams. For instance, destructive interferences between multipoles of opposite spatial parity can be exploited to cancel backscattering. This effect, theoretically predicted 30 years ago by Milton Kerker, makes it possible to produce subwavelength particles that scatter light in the forward direction, thus sharing the main features of the fictitious sources used in the Huygens-Fresnel principle. Once assembled in a periodic two-dimensional network, such particles, named ''Huygens sources'', offer unique opportunities for the development of flat and ultrathin optical components called "metasurfaces" that enable the arbitrary control of the phase, amplitude and/or polarization of a beam of light. Over the past few years, Huygens metasurfaces have been widely explored to engineer highly efficient lenses, beam deflectors, vortex beams, holograms or perfect absorbers, that have relied on two-dimensional anisotropic Huygens sources. In contrast to approaches investigated thus far, this thesis focuses on the study of isotropic Huygens sources. We investigate homogeneous, composite and core-shell particles as a solution to reach the Kerker regime. Subsequently, we demonstrate that wave-front shaping is indeed possible by using spherical systems composed of clusters of dielectric inclusions and we present a multipolar formalism that can be used as a guideline to optimize the absorption of Huygens arrays. The structures we study are realistically achievable by bottom-up fabrication and self-assembly, offering an alternative to the classical lithographically fabricated metasurfaces
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Larsson, Karl. "Scale-Space Methods as a Means of Fingerprint Image Enhancement." Thesis, Linköping University, Department of Science and Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2282.

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<p>The usage of automatic fingerprint identification systems as a means of identification and/or verification have increased substantially during the last couple of years. It is well known that small deviations may occur within a fingerprint over time, a problem referred to as template ageing. This problem, and other reasons for deviations between two images of the same fingerprint, complicates the identification/verification process, since distinct features may appear somewhat different in the two images that are matched. Commonly used to try and minimise this type of problem are different kinds of fingerprint image enhancement algorithms. This thesis tests different methods within the scale-space framework and evaluate their performance as fingerprint image enhancement methods. </p><p>The methods tested within this thesis ranges from linear scale-space filtering, where no prior information about the images is known, to scalar and tensor driven diffusion where analysis of the images precedes and controls the diffusion process. </p><p>The linear scale-space approach is shown to improve correlation values, which was anticipated since the image structure is flattened at coarser scales. There is however no increase in the number of accurate matches, since inaccurate features also tends to get higher correlation value at large scales. </p><p>The nonlinear isotropic scale-space (scalar dependent diffusion), or the edge- preservation, approach is proven to be an ill fit method for fingerprint image enhancement. This is due to the fact that the analysis of edges may be unreliable, since edge structure is often distorted in fingerprints affected by the template ageing problem. </p><p>The nonlinear anisotropic scale-space (tensor dependent diffusion), or coherence-enhancing, method does not give any overall improvements of the number of accurate matches. It is however shown that for a certain type of template ageing problem, where the deviating structure does not significantly affect the ridge orientation, the nonlinear anisotropic diffusion is able to accurately match correlation pairs that resulted in a false match before they were enhanced.</p>
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Neiva, Mariane Barros. "Métodos de pré-processamento de texturas para otimizar o reconhecimento de padrões." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-25102016-084409/.

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A textura de uma imagem apresenta informações importantes sobre as características de um objeto. Usar essa informação para reconhecimento de padrões vem sendo uma tarefa bastante pesquisada na área de processamento de imagens e aplicado em atividades como indústria têxtil, biologia, análise de imagens médicas, imagens de satélite, análise de peças industriais, entre outros. Muitos pesquisadores focam em criar mecanismos que convertam a imagem em um vetor de características a fim de utilizar um classificador sobre esse vetores. No entanto, as imagens podem ser transformadas para que que características peculiares sejam evidenciadas fazendo com que extratores de características já existentes explorem melhor as imagens. Esse trabalho tem como objetivo estudar a influência da aplicação de métodos de pré-processamento em imagens de textura para a posterior análise das imagens. Os métodos escolhidos são seis: difusão isotrópica, difusão anisotrópica clássica, dois métodos de regularização da difusão anisotrópica, um método de difusão morfológica e a transformada de distância. Além disso, os métodos foram aliados a sete descritores já conhecidos da literatura para que as características das imagens tranformadas sejam extraídas. Resultados mostram um aumento significativo no desempenho dos classificadores KNN e Naive Bayes quando utilizados nas imagens transformadas de quatro bases de textura: Brodatz, Outex, Usptex e Vistex.<br>The texture of an image plays an important source of information of the image content. The use of this information to pattern recognition became very popular in image processing area and has applications such in textile industry, biology, medical image analysis, satelite images analysis, industrial equipaments analysis, among others. Many researchers focus on creating different methods to convert the input image to a feature vector to the able to classify the image based on these vectors. However, images can be modified in different ways such that important features are enhanced. Therefore, descriptors are able to extract features easily to perform a better representation of the image. This project aims to apply six different preprocessing methods to analyze their power of enhancement on the texture extraction. The methods are: isotropic diffusion, the classic anisotropic diffusion, two regularizations of the anisotropic diffusion, a morphologic diffusion and the distance transform. To extract the features of these modified images, seven texture analysis algorithms are used along KNN and Naive Bayes to classify the textures. Results show a significant increase when datasets Brodatz, Vistex, Usptex and Outex are transformed prior to texture analysis and classification.
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Maheu, Bruno. "Généralisation de la théorie de Lorenz-Mie et applications." Rouen, 1987. http://www.theses.fr/1987ROUES025.

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Théorie de la diffusion d'un faisceau gaussien par un diffuseur sphérique homogène et isotrope. Les résultats ouvrent sur des applications à la granulométrie optique. On expose par la suite un modèle à quatre flux pour décrire la diffusion multiple d'une onde électromagnétique par un nuage dense de diffuseurs
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Raimond, Olivier. "Flots stochastiques isotropes et diffusions autoattractives." Paris 11, 1994. http://www.theses.fr/1994PA112407.

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Cette these est constituee de deux parties independantes. Dans une premiere partie, on etudie les flots stochastiques isotropes sur des eplanes homogenes particuliers (la sphere et le plan hyperbolique), dans la seconde on etudie les diffusions autoattractives. Pour trouver tous les flots stochastiques isotropes, on decompose les champs de vecteurs aleatoires isotropes. On trouve une decomposition de la matrice de covariance de ces champs de vecteurs. A partir de cette matrice de covariance, on calcule les exposants de lyapounov du flot qui decrivent le comportement asymptotique du flot. Le signe du premier exposant de lyapounov permet de discuter de la stabilite du flot. Dans le cas de la sphere, on voit que les flots tels que le champ de vecteurs associe soit un champ de gradient sont stables en dimension inferieure a quatre et sont soit stables soit instables sinon, la partie de divergence nulle du flot etant toujours facteur d'instabilite. Il en est de meme pour le plan hyperbolique, mais meme un flot de gradient peut etre instable. Ainsi, on voit l'influence de la courbure et de la dimension sur la stabilite du flot. On etudie aussi le processus distance entre deux points transformes par le flot. Pour la sphere, dans le cas stable ce processus converge vers zero presque surement, dans le cas instable il est recurrent. Pour le plan hyperbolique, dans le cas stable, le processus distance converge vers zero ou vers l'infini, dans le cas instable il diverge. Les diffusions autoattractives sont des processus attires par chacun des points de leur trajectoire passee. Ici on considere le cas de l'interaction constante en dimension superieure a deux. Le resultat demontre est la convergence presque sure de ces processus
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Nilsen, Vebjorn. "Investigation of differentially diffusing scalars in isotropic decaying turbulence /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/7028.

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Chatenay, Didier. "Diffusion, solubilisation et propriétés interfaciales dans les solutions isotropes d'amphiphiles." Phd thesis, Université Pierre et Marie Curie - Paris VI, 1987. http://tel.archives-ouvertes.fr/tel-00011858.

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Nous avons étudié, à l'aide de techniques optiques, plusieurs propriétés des solutions isotropes d'amphiphiles (micelles et microémulsions). Dans une première partie, nous avons utilisé ces systèmes en tant que systèmes colloïdaux modèles afin d'étudier les variations du coefficient d'auto-diffusion de particules en interaction avec la concentration de particules et les interactions ; cette étude a été réalisée à l'aide d'un montage de Recouvrement de Fluorescence Après Photoblanchîment que nous avons réalisé. En utilisant des solutions micellaires, nous avons ainsi pu montrer que le coefficient d'auto-diffusion de particules en interaction dépend peu de ces interactions (contrairement au coefficient de diffusion collective mesurée par Diffusion Quasi-élastique de la Lumière) et que les coefficients de friction associés à ces deux coefficients de diffusion étaient différents. Dans le cas des microémulsions, nous avons mis en évidence l'effet des phénomènes d'agrégation réversible (responsables des phénomènes de percolation électrique) sur les mécanismes d'auto-diffusion. Dans une seconde partie, nous avons utilisé les techniques expérimentales utilisées dans le cadre du travail décrit ci-dessus en vue d'étudier la structure de microémulsion en présence de protéines solubilisées. En particulier, nous avons pu déterminer les rayons des gouttelettes de microémulsion ayant solubilisé une protéine dans les deux cas extrêmes où le volume du coeur acqueux est supérieur ou inférieur au volume de la protéine. Enfin, nous avons étudié les propriétés interfaciales des mélanges polyphasiques eau-huile-amphiphiles ; nous avons ainsi pu mettre en évidence le rôle primordial du film interfacial dans l'obtention de basses tensions interfaciales.
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Chatenay, Didier. "Diffusion, solubilisation et phénomènes interfaciaux dans les solutions isotropes d'amphiphiles." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376038516.

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Book chapters on the topic "Isotropic diffusion"

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Darling, R. W. R. "Isotropic Stochastic Flows: A Survey." In Diffusion Processes and Related Problems in Analysis, Volume II. Birkhäuser Boston, 1992. http://dx.doi.org/10.1007/978-1-4612-0389-6_3.

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Gayley, Kenneth G., and Stanley P. Owock. "The Non-Isotropic Diffusion Approximation in Wolf-Rayet Winds." In Wolf-Rayet Stars: Binaries, Colliding Winds, Evolution. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0205-6_36.

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Gervang, B., K. Olesen, and M. Gerritsma. "A Mimetic Spectral Element Method for Non-Isotropic Diffusion Problems." In Lecture Notes in Computational Science and Engineering. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65870-4_15.

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Vergnaud, Jean-Maurice. "Diffusion-Evaporation in Two and Three Dimensions: Isotropic and Anisotropic Media." In Drying of Polymeric and Solid Materials. Springer London, 1992. http://dx.doi.org/10.1007/978-1-4471-1954-8_8.

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Stefanescu, A., and A. Kassab. "A Boundary Integral Method for Transient Heat Diffusion in Isotropic Non-Homogeneous Media." In IUTAM/IACM/IABEM Symposium on Advanced Mathematical and Computational Mechanics Aspects of the Boundary Element Method. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-015-9793-7_31.

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Ianuş, Andrada, Ivana Drobnjak, and Daniel C. Alexander. "Model-Based Estimation of Microscopic Anisotropy in Macroscopically Isotropic Substrates Using Diffusion MRI." In Lecture Notes in Computer Science. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19992-4_55.

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Tung, M. M., and A. Hervás. "A Differential-Geometric Approach to Model Isotropic Diffusion on Circular Conic Surfaces in Uniform Rotation." In Progress in Industrial Mathematics at ECMI 2008. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12110-4_167.

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Brethouwer, G., and F. T. M. Nieuwstadt. "Mixing of Weakly and Strongly Diffusive Passive Scalars in Isotropic Turbulence." In Direct and Large-Eddy Simulation III. Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-015-9285-7_26.

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Shivamoggi, Bhimsen K. "Probability Distribution Function for the Gradient of a Passive Scalar Diffusing in Isotropic Turbulence: Mapping-Closure Model." In Advances in Turbulence VI. Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0297-8_178.

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Bernard, Thierry M. "LOCAL AND ISOTROPIC ERROR DIFFUSION: WHY AND HOW?" In Signal Processing. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89587-5.50069-4.

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Conference papers on the topic "Isotropic diffusion"

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Jagmohan, Ashish, Anshul Sehgal, and Narendra Ahuja. "Isotropic error diffusion halftoning." In Proceedings of ICASSP '02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.5745366.

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Jagmohan, Sehgal, and Ahuja. "Isotropic error diffusion halftoning." In IEEE International Conference on Acoustics Speech and Signal Processing ICASSP-02. IEEE, 2002. http://dx.doi.org/10.1109/icassp.2002.1004624.

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Gopalan, Balaji, Edwin Malkiel, and Joseph Katz. "Diffusion of Slightly Buoyant Droplets in Isotropic Turbulence." In ASME 2006 2nd Joint U.S.-European Fluids Engineering Summer Meeting Collocated With the 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/fedsm2006-98530.

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We study the diffusion of slightly buoyant droplets in isotropic turbulence using High Speed Digital Holographic PIV. Droplets (Specific Gravity 0.85) are injected in the central portion of an isotropic turbulence facility with weak mean flow. Perpendicular digital inline holograms are recorded in a 37 × 37 × 37 mm3 region of interest using two high speed cameras. Data are recorded at 250 frames per second (2000 frames per second is the maximum possible frame rate). An automated program is developed to obtain two dimensional tracks of the droplets from two orthogonal images and match them to get three dimensional tracks. Cross correlation of droplet images are used for measuring their velocities. The time series are low pass filtered to obtain accurate time history of droplet velocities. Data analysis determines the PDF of velocity and acceleration in three dimensions. The time history also enables us to calculate the three dimensional Lagrangian velocity autocorrelation function for different droplet radii. Integration of these functions gives us the diffusion coefficients. For shorter time scales, when the diffusion need not be Fickian we can use the three dimensional trajectories to calculate the generalized dispersion tensor and measure the time elapsed for diffusion to become Fickian.
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YEUNG, P., and S. POPE. "Spectra of multiscalar differential diffusion in isotropic turbulence." In 23rd Fluid Dynamics, Plasmadynamics, and Lasers Conference. American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-3103.

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Senra Filho, Antonio Carlos da S., Juliano Jinzenji Duque, and Luiz Otavio Murta. "Isotropic anomalous filtering in Diffusion-Weighted Magnetic Resonance Imaging." In 2013 35th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2013. http://dx.doi.org/10.1109/embc.2013.6610427.

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Wang, Tsili. "Diffusion of electromagnetic fields in a transversely isotropic medium." In SEG Technical Program Expanded Abstracts 2002. Society of Exploration Geophysicists, 2002. http://dx.doi.org/10.1190/1.1817346.

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Gopalan, Balaji, Edwin Malkiel, Jian Sheng, and Joseph Katz. "Diesel Droplet Diffusion in Isotropic Turbulence With Digital Holographic Cinematography." In ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77423.

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High-speed in-line digital holographic cinematography was used to investigate the diffusion of droplets in locally isotropic turbulence. Droplets of diesel fuel (0.3–0.9mm diameter, specific gravity of 0.85) were injected into a 37×37×37mm3 sample volume located in the center of a 160-liter tank. The turbulence was generated by 4 spinning grids, located symmetrically in the corners of the tank, and was characterized prior to the experiments. The sample volume was back illuminated with two perpendicular collimated beams of coherent laser light and time series of in-line holograms were recorded with two high-speed digital cameras at 500 frames/sec. Numerical reconstruction generated a time series of high-resolution images of the droplets throughout the sample volume. We developed an algorithm for automatically detecting the droplet trajectories from each view, for matching the two views to obtain the three-dimensional tracks, and for calculating the time history of velocity. We also measured the mean fluid motion using 2-D PIV. The data enabled us to calculate the Lagrangian velocity autocorrelation function.
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Senra Filho, Antonio Carlos da S., Carlo Rondinoni, Antonio Carlos dos Santos, and Luiz O. Murta. "Brain activation inhomogeneity highlighted by the Isotropic Anomalous Diffusion filter." In 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2014. http://dx.doi.org/10.1109/embc.2014.6944331.

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Yeung, P., and Catherine Moseley. "Effects of mean scalar gradients on differential diffusion in isotropic turbulence." In 33rd Aerospace Sciences Meeting and Exhibit. American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-866.

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Nava, Lara, and Stefano Gabici. "Cosmic ray diffusion close to supernova remnants: Isotropic vs anisotropic model." In HIGH ENERGY GAMMA-RAY ASTRONOMY: 5th International Meeting on High Energy Gamma-Ray Astronomy. AIP, 2012. http://dx.doi.org/10.1063/1.4772244.

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