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 39 for “"Fouled"”.
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Performance of Fouled Railroad Superstructure Subjected to Traversing Heavy Haul Trains
… this thesis evaluates the performance of fouled railroad superstructure through laboratory testing of fouled sub-structure material, field monitoring of fouled track section at the test site and finite element analysis of the fouled track performance. First, isotropically consolidated …
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Fouled yachts : a vector for marine invasive alien species to South African shores?
Biofouling on recreational yachts is an important vector for marine invasive alien species (MIAS) in many countries. There are various characteristics of a vessel that make it more susceptible to hull fouling. Yachts in three Western Cape marinas were surveyed to assess extent of fouling, hull …
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Mechanisms of MS2 bacteriophage removal by ultrafiltration membrane with different foulants
… tested were pristine membrane, membrane fouled by SMP, backwashed membrane, and chemically cleaned membrane. The order of MS2 removal by these membranes was: fouled membrane > backwashed membrane > chemically cleaned membrane ≈ pristine membrane. A linear correlation between membrane …
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Mechanistic Study of Fouling and Regeneration of Palladium-Based Bimetallic Catalysts Used for the Removal of Pollutants From Drinking Water
… reduction, determine regeneration strategies for fouled-catalysts, and gain insight into the fouling and regeneration mechanisms associated with Pd-based catalysts. A series of batch experiments with Pd-Cu/gamma-Al 2O3 and Pd-In/gamma-Al2O3 catalysts showed that sulfide was the most severe …
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Railway ballast permeability
… Constant Head Aggregate Permeameter on clean and fouled ballast providing results that show the flow through clean ballast can be on the order of fourteen times as high as that through fouled ballast and it displays a nonlinear discharge velocity versus hydraulic gradient relationship. As the …
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Development of ice-bonded ballast in sub-freezing temperatures and its effect on maintenance operations during a winter rail break
… ballast has on rail break gap. Clean and fouled-ballast shear strengths exhibited different behaviors when frozen. The f0 of fouled-frozen ballast increased two to five times, and the gap size reduced ~67% and 50% for timber and concrete crosstie track, respectively. The fastening system …
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The effects of biotic and abiotic factors on byssogenesis, growth and movement patterns of the blue mussel, Mytilus edulis
… that more byssal threads were produced by fouled mussels at sheltered sites during summer, while stronger byssal threads were produced by epibiont-fouled mussels during winter. Although mussel growth was greater at wave-exposed sites in the summer, epibiont fouling did not influence growth. …
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Shipboard applications of non-intrusive load monitoring
… inlet strainers, faulty motor/pump coupling, fouled heat exchangers) as well as provide a backup indication of flow levels to heat loads. Data collected from the Sewage System of the SENECA indicate several metrics which can be applied to cycling systems in general to differentiate between …
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Boiling heat transfer characteristics of steam generator U-tube fouling
… it. The data were consistent with that of fouled u-tubes pulled from CANDU steam generators. The conditions of the heat transfer measurements and the fabricated deposits were similar to those of US and Canadian steam generators. Therefore, the conclusions drawn in this study are presumed to …
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Integrated computational and experimental framework for the assessment of railroad ballast life-cycle behavior
… particle morphological properties of clean and fouled ballast materials were analyzed in the laboratory in order to provide input properties for the DEM numerical simulations. Moving to the laboratory scale, large-scale triaxial tests were performed in the laboratory under controlled monotonic …
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Simulation, optimisation and flexible scheduling of MSF desalination process under fouling. Optimal design and operation of MSF desalination process with brine heater and demister fouling, flexible design operation and scheduling under variable demand and seawater temperature using gPROMS.
… final purity of freshwater for both cleaned and fouled demister conditions is studied. It was found that the purity of freshwater is affected by the total number of stages. Also to maintain the purity of freshwater product, comparatively large number of flash stage is required for fouled demister.
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Flow through and around fish farming nets
… performed for a cage with a clean net and a biofouled net and compared with field measurements of a cage fouled with jellyfish. The measured data compared well with model predictions for the biofouled net. Flushing rates were calculated for both the clean and the biofouled net cases. When the …
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Electroding Methods for in situ Reverse Osmosis Sensors
… monomer. Platinized polymer graft sensors were fouled in both dead-end and cross-flow RO systems, and their impedance trends, while varying between sensors, indicate protein-fouling sensitivity.
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Factors Affecting Hydraulic Conductivity of High pH, High Silica Groundwater at the Former Occidental Chemical Corporation Facility
… is being avoided because doing so has previously fouled well screens. This study used batch and column tests to identify factors that affect hydraulic conductivity of OCC site soil in response to high pH groundwater. High pH groundwater at the OCC site has elevated concentrations of Si and Al. …
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Fouling mechanisms in the membrane filtration of single and binary protein solutions
… and quantitatively analyse mixed proteins fouled on ultrafiltration membranes. An apparent critical flux was identified whereby fouling was shown to occur at fluxes where there was no increase in TMP. TMP increase is one of the common indicators of fouling in controlled flux operation. …
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Cultivation of Palmaria palmata: spore release, vegetative propagation and decontamination techniques.
… to the time of year as the biomass was heavily fouled with epiphytes. There is potential for this species to be grown commercially if further research takes place to overcome the persisting problems described in this thesis.
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Screening of Microfiltration and Ultrafiltration Ceramic Membranes for Produced Water Treatment and Testing of Different Cleaning Methods
… and backpulsing were used to clean the fouled UF membrane. Hermia’s models were used to investigate the fouling mechanisms involved in all the filtration operations conducted. It was found that the cake layer formation and at a lesser degree the intermediate blocking were the predominant …
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Advances in membrane-based oil/water separation
… predominance, membranes can become severely fouled and irreversibly damaged when bulk and small stabilized oil droplets, emulsions, are present in intake streams. In this thesis, we seek to mitigate these deleterious effects through several means. First we seek to better understand fouling by …
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Adsorption & Adhesion of Asphaltenes at Complex Interfaces: An AFM Approach
… and nanomechanical characterisation of real-life fouled samples revealed the efficacy of an adhesion inhibitor in decreasing roughness and tuning surface chemistry by competitively adsorbing onto the relevant surfaces. A combination of the two mitigating strategies suggested has shown to have an …
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