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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"Fickian diffusion"”.
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The development of h Homogeneous nucleation rate model for thermoplastic foams based on a molecular partition function and Fickian diffusion
… component physical property data and a binary diffusion coefficient. This model, like those derived from classical nucleation theory, is made up of two parts, one that determines the size of the energy barrier in the nucleation process and one that estimates the forward rate of the process. A …
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Mathematical models of combustion at high pressure
… we analyze the structure of laminar diffusion flames at high pressure in the limit of large activation energy for the particular configuration of a steady flame in counterflow. We consider a dense fluid in which normal Fickian diffusion of the fuel is limited, and thermal diffusion, …
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Statistical imaging of transport in complex fluids: a journey from entangled polymers to living cells
… and millisecond resolution. On the list are diffusion of nanoparticles and vesicles in crowded environments, reptational motion of polymers in entangled semidilute solutions, and active endosome transport along microtubules in living cells. We started from individual trajectories, and then …
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FAILURE MECHANISMS OF STRUCTURAL ADHESIVE JOINTS
… an adhesive joint, calculated data assuming Fickian diffusion through the resin to predict water distribution after certain exposure times was compared with the water distribution results obtained using the radio tracer technique. These results suggest that water may enter joints mainly …
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Biological applications of weal polyelectrolyte multilayers
… release, whereas microporous films displayed Fickian diffusion. The efficacy of the released drugs was checked by monitoring the effect of released cytochalasin D on fibroblasts' division.
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Mathematical Modeling of Vascular Tumor Growth and Development
… The avascular sub-model is primarily based of Fickian diffusion of nutrients into the tumor. While the angiogenesis sub-model is based on the diffusion and chemotaxis of active sprout tips into the tumor. These two portions of the models allow the effects of microvessels on nutrient …
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Novel Biomimetic Polymeric Nanoconjugates as Drug Delivery Carriers for Poorly Soluble Drugs
… a higher release profile than ibuprofen control. Fickian and non-Fickian anomalous mechanisms were deduced for the drug release of ibuprofen from the binary conjugates. The ternary nanoconjugates exhibited non-Fickian (anomalous) diffusion, Fickian diffusion and Super Case II transport release …
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Mathematical Modeling, Analysis and Control of Some Infectious Diseases
… consideration. The model is parabolic, since the Fickian diffusion is assumed to be valid. In chapters 2 and 3, we investigate on the spread of two infectious diseases, which differ from each other via different transmission vehicles of the virus. In particular, chapter 2 deals with a new model …
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Nonequilibrium thermodynamics of porous electrodes for lithium-ion batteries
… as describing phase separating materials with Fickian diffusion. In this thesis, we build on existing battery models by modifying key parts to better capture fundamental phenomena including transport and reactions in phase separating materials. First, we introduce a model of lithium transport …
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The diffusion of water and aviation fuel in polysulphide sealants
The diffusion and permeation of aviation fuel (Avtur) and water in commercial and 'model' polysulphide sealants have been studied using simple gravimetric techniques. For Avtur, the mass uptake behaviour is explicable in terms of normal, Fickian diffusion, and the diffusion coefficient determined …
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Chemo-elastic behavior of reconstructed Li-ion battery cathode particles with phase transformation: a numerical and analytical investigation
… chemical-expansion coefficient, [beta]. Diffusion-induced stresses (DIS) can be quite extreme with increasing particle size, Li concentration and discharge rate. Peaks of DIS locally emerge in the vicinity of concave features and protuberances of the anisotropic-elastic actual …
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The effect of electrical processing on mass transfer and mechanical properties of food materials
… was measured by image analysis. Effective diffusion coefficients (D\(_{eff}\)) for mass transfer of betanin and rhodamine6G were estimated, assuming Fickian diffusion was valid. Mechanical properties of alginate and gellan gum treated with MEF and PEF were studied. Compression force of gel …
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Measurement of rapid protein diffusion in the cytoplasm by photoconverted intensity profile expansion
… role in biological function. To measure protein diffusion in cells, researchers have developed multiple fluorescence microscopy methods, and have tested them rigorously. However, using these methods for precise measurement of diffusion coefficients requires expertise that can be a barrier to …
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Structure and Dynamics of Associative Polymer Gels
… which governs their properties such as self-diffusion, relaxation, and creep. In this thesis, a combined experimental and computation approach was used to provide new insight into the structure and dynamics of associative networks on various length and time scales, with the goal of …
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Elastomer Degradation in Chemically Reactive Environment under Elevated Temperature and Pressurized Condition
… due to the viscoelastic nature of polymers, diffusion-reaction process plays an important role in accelerating elastomer deterioration. In a previous research, Fickian diffusion was often used to model the small molecule ingression in bulk elastomeric materials. Under high temperature and …
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Bioresorbable Osmotic Pump for Long–term Contraception
… are mostly limited to non-bioresorbable matrix-diffusion systems. These Fickian diffusion-based systems raise problems like inconstant release rates that compromise their long-term efficacy, the requirement of surgical removal, and a long pharmacokinetic tail that delays the user’s return to …
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Refractometry Studies of the Optical Properties of Polymer Films and the Development of Polymer Coated Refractive Index Sensors
… during uptake. This model can be used with Fickian diffusion models to measure the diffusion coefficients through the bulk film and at the film-substrate interface. The diffusion of water and other organic solvents into SU-8 epoxy was explored using refractometry and the diffusion …
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Investigation into reliability and performance of an implantable closed-loop insulin delivery device
… using fluorescein sodium was determined as a Fickian diffusion controlled release mechanism. The diffusion coefficient (D) for FITC-insulin in the non-polymerised dex2M-conA gel (NP gel) determined using mathematical models, QSS and TL slope methods was 1.05 ± 0.02 x 10-11 m2/s and in the …
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Dynamics of Nanoparticles in Complex Media
… at short time scales. The dynamics approach Fickian diffusion at longer time scales and at all concentrations but deviate from predictions made from the bulk viscosity of the polymer solutions. These results indicate that particle dynamics are coupled to the polymer dynamics and highlight the …
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Assessment of mesoscale eddy parameterizations for coarse resolution ocean models
… temperature; this thesis also evaluates the Fickian diffusive, the diabatic Green-Stone (GS) and the quasi-adiabatic Gent-McWilliams (GM) parameterizations in a diagnostic study and a series of coarse resolution experiments with the same model in the same configuration. The mesoscale eddies …
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