diffusion equation

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diffusion equation [də′fyü·zhən i′kwā·zhən]

(physics)

An equation for diffusion which states that the rate of change of the density of the diffusing substance, at a fixed point in space, equals the sum of the diffusion coefficient times the Laplacian of the density, the amount of the quantity generated per unit volume per unit time, and the negative of the quantity absorbed per unit volume per unit time.

More generally, any equation which states that the rate of change of some quantity, at a fixed point in space, equals a positive constant times the Laplacian of that quantity.

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No references found			1/4] (3) By using Einstein's diffusion equation, where D is the diffusion coefficient, it is possible to show that healing is related to time to a power of 1/4, such that X ~ [t. Semi-empirical, squeeze flow and intermolecular diffusion model. I. ... by Grewell, David; Benatar, Avraham / Polymer Engineering and Science The thermal diffusion equation The heat propagation within a sample is given by the thermal diffusion equation [1,8,9] [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] (1) ## which contains the locally-dependent thermal parameters temperature , T heat flux h, thermal conductivity k, mass density [rho] and thermal density c = h[rho]. Correlation between hardening depth and thermal parameters based on ... by Kruse, Dennis; Prekel, Helmut; Goch, Gert; Walther, Heinz G. / Proceedings of the Estonian Academy of Sciences: Engineering 2004, Blow-up rate for a nonlinear diffusion equation with absorption and nonlinear boundary flux, Adv. Blow-up rate for a porous medium equation with convection by Zhou, Jun; Mu, Chunlai / Global Journal of Pure and Applied Mathematics			diffused-junction transistor Diffuser diffusing disk diffusing glass diffusing panel diffusing screen diffusing surface diffusiometer Diffusion diffusion annealing Diffusion Apparatus diffusion area diffusion barrier diffusion bonding diffusion brazing diffusion capacitance Diffusion Chamber diffusion cloud chamber Diffusion Coating diffusion coefficient diffusion constant diffusion current diffusion diagram diffusion diameter diffusion disk diffusion equation diffusion extraction diffusion flame diffusion gradient diffusion hygrometer diffusion kernel diffusion length diffusion lens diffusion number Diffusion of Neutrons Diffusion of Power Theory diffusion plant diffusion potential Diffusion Pressure Deficit Diffusion Processes diffusion pump diffusion respiration diffusion streak diffusion theory diffusion transistor diffusion velocity Diffusion Welding diffusion-limited aggregation diffusion-limited current density diffusion-transfer process Diffusionism			Diffusion constant Diffusion constant diffusion current Diffusion d'Abonnements de la Librairie Georg Diffusion d'Instruments de Mesure Diffusion de Biens d'Equipement de l'Habitat Diffusion De Donnes Diffusion de l'Information sur l'Amérique Latine Diffusion de la Culture Scientifique et Technique Diffusion de la Pensée Française Diffusion de Matériel Hydraulique Diffusion de Matériel Industriel Diffusion de Pièces Détachées d'Origine Diffusion de Pièces Froids et Chauds diffusion defect diffusion deposition Diffusion des Arts et des Savoirs Par l'Image Diffusion des Productions Basques Diffusion des Savoirs diffusion diagram diffusion diameter diffusion disk Diffusion Edited Total Correlation Spectroscopy Diffusion Électro Thermique Diffusion en Modulation de Fréquence diffusion equation Diffusion et Fabrication de Pièces de Rechange diffusion extraction diffusion factor Diffusion flame Diffusion Française de Produits de Phytothérapie Diffusion Generale de Librairie diffusion gradient Diffusion Hôtel Magazine diffusion hygrometer diffusion hypoxia diffusion hypoxia diffusion hypoxia diffusion hypoxia Diffusion Immunoassay Diffusion in materials Diffusion in materials Diffusion in materials Diffusion in materials Diffusion index Diffusion Induced Grain Boundary Migration Diffusion Industrielle de Produits d'Automatisme et de Contrôle Diffusion Industrielle France Export Diffusion Internationale d'Articles Manufacturés Diffusion Internationale du Meuble diffusion kernel diffusion length diffusion lens Diffusion Limited Aggregation Diffusion Limited Cluster Aggregation diffusion line

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