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.
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Showing 1 to 20 of 72 for “"transport rate"”.
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Transport in Lagrangian-unsteady flows : dipersion in diverging or converging ducts, and transport rate enhancement accompanying laminar chaos
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1997.
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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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Glycerol permeability in erythrocytes of Peromyscus californicus : the effect of temperature
… the half-saturation constant (ø) and the maximum transport rate (K) of the facilitated diffusion of glycerol across the erythrocyte membrane of Peromyscus californicus.
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The effects of groundwater seepage on stream regimen : a laboratory study
… has little effect on stream competence or transport rate, even when quicksand conditions are reached. The decrease in effective grain density brought about by uptward seepage might possibly be compensated entirely or in part by a decrease in surface drag and an increase in form drag on …
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Modelling fine sediment transport over an immobile gravel bed
… represents a significant component of the total transport load in most fluvial systems around the world that are not limited to the alluvial rivers with sandy beds. A variety of natural or human actions, such as fire, logging, flow diversion, road construction, and urban or agricultural …
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Bedload Transport in Gravel-Bed Streams under a wide range of Shields Stresses
Bedload transport is a complicated phenomenon in gravel-bed streams. Several factors account for this complication, including the different hydrologic regime under which different stream types operate and the wide range of particle sizes of channel bed material. Based on the hydrologic regime, …
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The thiourea carrier in human erythrocytes
… transfer (half-saturation constant and maximum transport rate) and the energy of dissociation of the carrier complex. In the president experiment, the problem has been approached by observing the exit of thiourea, from cells previously equilibrated with thiourea, into a saline medium containing …
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Computational Studies of Autocrine Ligand Binding
… measuring central parameters including secretion rate and receptor number. A mathematical modeling approach offers hope for improved understanding of the kinetic and transport rate processes involved in autocrine cell phenomena.
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Abrasion Prediction at Kayraktepe Sediment Bypass Tunnel in Turkey
… problems due to intense bedload sediment transportation. Three existing abrasion prediction models are introduced developed respectively by Ishibashi (1983), Sklar and Dietrich (2004), and Auel et al. (2015). Those models are applied to estimate the abrasion of the Kayraktepe sediment …
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Molecular Cloning and Structure-Function Analysis of the Plant Proton-Sucrose Symporter
… they all displayed enhanced sucrose transport rate. H65Q and G334S also increased maltose transport activity. In the predicted ""6-loop-6"" topology of the symporter, these residues all face extracellularly, suggesting their involvement in substrate binding. To investigate this …
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Cross-Shore Sediment Transport in Relation to Waves and Currents in a Groin Compartment
… may produce a net cross-shore sediment transport in one direction. The sediment transport mostly occurs as bedload where the waves are non-breaking.</p> <p>Sediment transport on a sloping bed is also affected by gravity, and accordingly the Shields parameter should be re-evaluated for a …
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Colloidal microgels as (trans)dermal drug delivery systems
… a range of temperatures (292 K – 313 K). The transport rate of IBU and, PP from poly(NIPAM) microgel is significantly reduced by two and one order of magnitude, respectively, compared with the transport rate of saturated solutions. A huge reduction in the flux indicates that the microgel …
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Effect of helium injection on diffusion dominated air ingress accidents in pebble bed reactors
… pipe. Air enters into the reactor cavity at a rate dictated by diffusion, until the buoyancy force is strong enough to initiate natural convective flow through the reactor. The SCAD method, developed by Yan et al. reduces the buoyancy force in a high temperature gas reactor (HTGR), during the …
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Utilizing Nanoporous Alumina Membranes for Molecular Transport and Silica Nanotube Synthesis
… a variety of different substituted silanes. The transport of ions through these treated membranes was studied using several analytical tools such as ultraviolet-visible and fluorescence spectroscopy. The surface characteristics of the membrane were studied using a scanning electron microscope …
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Cutter, carriers and bucket brigades ...
… of fragment size, (b) the effect of load size on transport economics, (c) division of labour and task-partitioning. Grass-cutting ants, Atta vollenweideri, harvest grass fragments that serve as substrate for the cultivation of a symbiotic fungus. Foragers were observed to cut grass fragments …
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Impacts of vegetation-generated turbulence on sediment transport
… and mangroves, are disappearing at an annual rate of 1 to 7%. These ecosystems provide habitats important to fisheries, enhance water quality by filtering nutrients from run-off, and also protect coastal regions from storm surges and waves. To mitigate the loss of these habitats, restoration …
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Waves, currents, and sediment transport in the surf zone along long, straight beaches
… characteristics and the local sediment transport rate along long, straight beaches. The wave may be periodic or random, the beach may be plane or barred, and the bed may be concrete or covered with movable natural sand grains. The present model must be efficient and flexible so that it …
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Functional characterisation of the human mitochondrial ATP-Mg/Pi carriers and their disease-causing variants
… carrier domain, which catalyses substrate transport. In the proposed “locking-pin” mechanism, the amphipathic helix is bound to the regulatory domain in the presence of calcium, whereas it is bound to the carrier domain in the absence of calcium. There are four different human APC …
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Tidal velocity asymmetries and bedload transport in shallow embayments
… forced circulation can cause a net near-bed transport of sediment when the tidal velocity is asymmetric about a zero mean (flood or ebb dominant) and the transport rate is nonlinearly related to velocity. The relationship between elevation and velocity is elucidated here to enable one to …
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