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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 91 for “"Transport rates"”.
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Quantification of membrane transport rates using optofluidics
The transport of ions and small molecules across membranes is a ubiquitous process in biological systems. Effective studies of membrane transport phenomena require suitable model membrane systems, efficient methods to quantify transport kinetics and a robust theoretical framework to derive …
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Effects of human development on aeolian sediment transport rates within an adjacent undeveloped backshore enclave
… enclave, what are the potential constraints to transport on a beach within an enclave and, are natural processes alone able to sustain a foredune in an enclave. A field investigation was conducted within an enclave in Bay Head, NJ between 02 November and 25 December 2014. Four events were …
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Bedload transport: the effects of particle shape and an investigation of a wide range of transport rates
The effects of particle shape on bedload transport and a wide range of bedload transport rates using both bed subsurface and surface layer based approaches are investigated using fractional transport analysis with a similarity approach. Bedload transport data from a stream containing flat, low …
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Mixing And Transport In The Kelvin-Stuart Cat Eyes Driven Flow Using The Topological Approximation Method
Transport rates for the Kelvin-Stuart Cat Eyes driven flow are calculated using the lobe transport theory of Rom-Kedar and Wiggins through application of the Topological Approximation Method (TAM) developed by Rom-Kedar. Numerical studies by Ottino (1989) and Tsega, Michaelides, and Eschenazi …
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An Anion Selective Aminocyclodextrin Ion Channel: Ion Selectivity, pH Sensitivity and Potential as a Scaffold for Light Gating
… functionalized pentabutylene glycol chains. Ion transport through the channel gauged using 23Na NMR and fluorescence spectroscopy indicated high ion transport activity, comparable to natural ion channels. The fluorescence studies also indicated that the ion channel was highly anion selective with …
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Heterogeneity effects on flow and transport within a shallow fluvial aquifer
The effects of aquifer heterogeneity on flow and transport are considered numerically at two scales using high resolution groundwater models. Heterogeneity effects on river loss were evaluated at the kilometer scale using stochastic, geostatistical models with grid cells on the order of several …
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Beach development, sediment budget and coastal erosion at Holderness.
… exist among offshore conditions, beach sediment transport and morphology, and till cliff erosion. Modelled and measured sediment transport rates established for the Holderness coast are similar to those on comparable coasts elsewhere. The direction of sediment drift depends on wave approach, and …
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Sediment Transport and Wind Flow Around Hummocks
… vegetation density, shear stress and sediment transport surrounding hummocks, a type of small dune. While qualitative observations and holistic, large-scale experiments regarding vegetation density and sediment transport have confirmed a negative correlation, fewer papers have quantitatively …
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Wave boundary layer hydrodynamics and cross-shore sediment transport in the surf zone
… are caused by the local imbalance of sediment transport, both in long-and cross-shore directions. Cross-shore sediment transport is the small difference between two large components: the on- and offshore transport rates. Both components must be very accurately predicted in order to predict …
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Bioavailability of Bioactive Compounds
… and blackberry essences using an in vitro Caco-2 transport assay. Caco-2 cells were seeded on semipermeable membranes and allowed to differentiate into a morphology that resembles mature small intestine enterocytes. Sample preparation, extraction methods, and enzymatic treatments were adjusted to …
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Trapping Efficiencies for the BLH-84, Helley-Smith, Elwha, and TR-2 Bedload Samplers
… coefficients are divided into raw trapping rates measured by the sampler to produce "true" bedload-transport rates equivalent to that which was inferred to have occurred in the absence of the sampler. Six combinations of sampler and bed types were tested; the BLH-84, Elwha, and Helley-Smith …
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Predicting post-absorptive amino acid supply to the mammary tissue
… AA uptake to preserve intracellular balance. AA transporters housed within the cellular membranes of mammary epithelial cells (MEC), the mammary glands' constituents, are responsible for mediating this intracellular balance. Thus, the objectives of this dissertation were to investigate how AA …
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Characterization of CAXCK31, a Bacterial Calcium/Proton Antiporter
<p>To better understand a class of transporters known as Calcium/Cation Antiporters (CaCAs), the bacterial calcium/proton antiporter CAXCK31 was purified and characterized. New methods were developed for its heterologous overexpression and purification. These methods help to define stress responses …
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First-passage time analysis of particle transport in the cytoplasm
… the variation in how individual particles are transported by activity within the cell. Here, first-passage time (FPT) analysis is presented as an alternate measure that can better represent the diversity of particle behavior. FPT analysis reveals that the diffusive-like motion of tracer …
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Wave-driven geomorphology of Pacific carbonate coastlines: from landscape to wavelength scale
… rise and wave climate change on sediment transport across a coral atoll fringing reef. I demonstrate that by the end of the century, sea-level rise will reduce sediment transport rates from the fore reef to the beach, but increase transport rates from the reef flat to the beach. Wave …
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Shore-parallel sediment transport by waves and tides in inner shelf waters
… MA, we compared the variations in net alongshore transport during different wave-current conditions, studying the effect of the wave-current phase to show that it can have a significant impact on transport rates in shallow water conditions. Three distinct intervals were looked at in particular, …
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Synthesis and Study of Biomimetic Ion Channels: (1) Toward the Development of a Cyclic Peptide-Based Redox-Gated Channel, and (2) Investigations Into the Effect of Pore Size on the Ion Selectivity of an Aminocyclodextrin Channel
… macrocycle was synthesized and its transport properties were compared with those of an analogous channel with a larger beta-cyclodextrin pore. The anion transport profile of the alpha-cyclodextrin channel (ClO 4- > I- > Br- > NO3- > Cl-) differed from that of its beta-cyclodextrin …
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Nano-materials for novel magneto-rheological liquids and nano-fluids
… yield tremendous enhancements in thermal and transport rates that still remain unexplained. Analogously, forty years ago the machining and synthesis of object features with nanometer dimensions and accuracy was a mere scientific interest. Today, that capability forms the core technical …
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Liquid extraction with single droplets-effect of chemical reaction
"The circulating drop mass transport model based on Hadamard's dispersed phase stream function was solved numerically to account for a solute diffusing into a droplet and undergoing a first order irreversible reaction with the drop medium for the case where the continuous phase resistance to solute …
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The Role of Instantaneous Forces in Particle Movement
… have been developed to predict bed load transport rates, most of which use some comparison between shear stress and critical shear stress. The critical shear stress is determined by the point of incipient motion. Researchers have attempted to predict bed load transport both …
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