Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 90 for “"Concentration Gradients"”.
-
Physical simulation of high temperature creep in systems with dynamic concentration gradients
Includes bibliographical references (pages 155-165).
-
Measurement and analysis of bath-side interfacial concentration gradients during membrane quenching by phase inversion
… of bath-side interfacial refractive index gradients during the quench step of membrane formation by phase inversion. From examination of individual Fourier components in a diffraction pattern associated with this one-dimensional mass transport process one is able to overcome the temporal …
-
Gibbsian Segregating Alloys Driven by Thermal and Concentration Gradients: A Potential Grazing Collector Optics Used in EUV Lithography
… forces, thermal (temperature) and surface concentration gradient (surface removal flux), are the focus of this work. Both theoretical and experimental efforts have been performed to prove the effectiveness of the GS alloy used as EUV collection optics, and to elucidate the underlying …
-
Fabrication, solute transport characterization and biological application of a microfluidic gradient chamber
… depends on microbial transformation. At elevated concentrations, these pollutants can be toxic, or at a minimum induce stress in microorganisms. Understanding microbial response to these stressors is key for mitigating their impact. In this study, a microfluidic gradient chamber (MGC) was …
-
Advection at a forest site – an updated approach
… instrumental accuracy required to observe small concentration gradients and small wind velocities and because of the spatio-temporal measurement resolution required to observe complex 3-D flow phenomena. This work presents an experimental multi-analyzer setup for the observation of horizontal CO2 …
-
Effects of Thickness, Morphology and Molecular Structure of Donor and Acceptor Layers in Thermally Interdiffused Polymer Photovoltaics
An in-depth study of concentration gradients in thermally-interdiffused polymer – fullerene photovoltaic devices, with a focus on thickness and heat treatments, is presented in this thesis. Device performance is improved from the bilayer by the creation of a concentration gradient of the donor and …
-
Infrared spectrometry of high polymers in the overtone and combination regions
… based on Beer's law can be used to determine concentration gradients. A study of such concentration gradients across the interface of a lamination could indicate the types of bending mechanisms. All samples were analyzed in the form of films with a Beckman DK-2 ratio recording …
-
Understanding particulate coating microstructure development.
… strength, gloss, particulate order, and concentration gradients are all determined by the way the particles come together as the coating dries. Cryogenic scanning electron microscopy (cryoSEM) is one of the most effective methods to directly visualize a drying coating during film …
-
Aspects of the physiology of decapod crustaceans with particular reference to the live marketing of Cancer pagurus (L) and Necora puber (L)
… was investigated and was found to be related to concentration gradients between the internal and external media. The fluxes could be explained on the basis of diffusion down concentration gradients. When animals were transferred to media with higher ammonia levels than those in blood, a cessation …
-
Synthesis and Characterization of Titanium Zirconium Based Alloys for Capacitor Use
… content. Alloy treatments which produce concentration gradients (a, a+ß fields) increased dielectric leakage; treatments maintaining uniform composition (as cast, wrought) retain low dielectric leakage current. UTS was fit to a solid solution model which compares well with related …
-
Soft hydrated sliding interfaces as complex fluids
… component. Recent studies have shown polymer concentration gradients resulting in a less dense region in the top micrometers of the surface. Under shear, this gradient is hypothesized to drive lubrication behavior due to its rheological similarity to a semi-dilute polymer solution. In this …
-
Microfluidic Concentration Gradient Generation and Integrated Magnetic Sorting of Microparticles
… stimulation of cells, rapid and novel designs of concentration gradient generation (CGG) devices are presented; for cell sorting, a magnetically The most prevalent type of CGG devices, i.e., complete mixing-based laminar-flow CGG devices, involves massive channel networks. The design of …
-
Microfluidic platforms for studying cell behavior in complex microenvironments
… such as changes in the extracellular matrix, gradients of soluble molecules, or reduced oxygen tensions will cause cells to alter their behavior. To more thoroughly understand how these cues alter cellular processes, advanced platforms capable of mimicking these microenvironments are …
-
Microfluidic Assessment of Stem Cell-Derived Pancreatic Beta Cells
… conditions, with the potential to generate concentration gradients for the study of biological phenomena such as cell migration. Utilization of these devices for cellular fluorescence imaging is also possible, paving the way for more sophisticated methods of dynamic assessment. Herein, we …
-
Studies on the characterization of a soluble factor of a sodium-activated, magnesium-dependent adenosinetriphosphatase in rat cerebral cortex
… ions across the cell membrane, this infers a concentration gradient of these ions. This differential distribution is important for certain life processes, for example, the propagation of nervous impulses mainly is dependent on the changes in concentration of sodium and potassium ions on both …
-
Time-scales of passive tracers in the ocean with paleoapplications
… to compute successive states of a passive tracer concentration in the global ocean. Times to equilibrium are longer than 1500 years for any one region in the global ocean and, near the equilibrium, concentration gradients give time-lags from hundreds to thousands of years between the Atlantic and …
-
Microfabrication methods for the study of chemotaxis
… of generating spatially and temporally stable concentration gradients of a chemotactic molecule while providing a viable environment for the cell. Numerical models were generated to investigate fluid flow in microchannels for given geometries. Through computational modeling and …
-
Understanding Primate Immunity to African Trypanosomes Through the Characterization of Trypanosome Lytic Factor Formation and Function
… allows sodium and calcium to influx down their concentration gradients. This influx of positive ions causes plasma membrane depolarization, triggering potassium ions to efflux and chloride ions to influx, down their concentration gradients. This ion flux results in an osmotic imbalance, which …
-
Evaporation of liquids from structured and non-structured mixtures
… the liquid mixture increases, the time taken for concentration gradients developing in the evaporation process to relax becomes longer relative to the time taken for diffusion through the stagnant vapour layer. For highly structured liquid mixtures, the rate limiting process switches to diffusion …
-
Heat and mass transfer effects of ice growth mechanisms in water and aqueous solutions
… desalination by freezing, freeze drying, freeze concentration and freeze crystallization for food processing, requires insight into the ice growth mechanisms. More so, a novel technology called Eutectic Freeze Crystallization, where water is recovered in the form of ice, requires that ice …
Page 1 of 5