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 133 for “"Clogging"”.
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Geochemistry of ferruginous clogging of Karoo wells
… in abstractions of water are important. The iron clogging of screens, pumps and filter packs in supply wells is a worldwide problem and the consequences can be severe, leading to costly and harsh rehabilitation measures or even loss of the well. A study was undertaken in order to determine the …
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Simulation of Hydrazine Microthruster Feed Tube clogging
Thesis: M.S., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 1983
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Modular auger design to prevent clogging in suction
… a modular auger system that reduces the risk of clogging in suction piping meant to process sargassum seaweed. The auger supports a slurry pump-based system being designed to address sargassum blooms adversely affecting beaches in the Caribbean. By reducing clogging, the auger will prevent damage …
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An experimental and theoretical investigation of the clogging of a rapid sand filter
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1935.
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Practical Application of NSF/ANSI 53 Lead Certified Filters: Investigating Lead Removal, Clogging and Consumer Experience
… reports of premature POU failure due to clogging in rural communities with high iron concentrations in their water. POU pitcher filters were tested with waters containing high lead and iron up to 100% of their rated capacity, or until they clogged as defined by a 75% reduction in initial …
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Calcium Carbonate Formation in Water Distribution Systems and Autogenous Repair of Leaks by Inert Particle Clogging
… and stop pipeline leaks via self-repair or clogging. Ironically, the actions we are taking to increase the lifespan of distribution systems (i.e. adding corrosion inhibitors) might have worsened leaks and pipe lifespans due to interference with self-repair. The increasing occurrence of …
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Solid particles flow through labyrinth channels in drip emitters
Clogging of drip irrigation emitters can reduce the effectiveness of drip irrigation systems. The most common way of studying clogging in a laboratory setting is to recreate the actual timing conditions of on-site drip irrigation systems. However, this requires a clogging period on the order of …
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The sticky property of Ypresian clays
… One major issue when managing soft soils is clogging, which occurs because cohesive soils tend to adhere to the cutting head of tunnel boring machines or to the cutting wheel of hydromills. This thesis focuses on Ypresian clays, which are highly adhesive. The adhesive properties of Ypresian …
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Vulnerabililty Analysis of Multi-Factor Authentication Protocols
… for cryptanalysis was formulated to perform a clogging attack (a formof denial of service) on protocols that use computationally intensive modular exponentiation to guarantee security. 2. This technique was then applied to cryptanalyze four recent password authentication protocols, to determine …
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Improving the design, construction, and maintenance of Permeable Interlocking Concrete Pavement (PICP) in South Africa
… in South Africa have prematurely failed through clogging. While some failures can be attributed to poor design, construction and site management, there is ongoing debate regarding the principal failure mechanisms, particularly in connection with the inclusion of a geotextile under the bedding …
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Treatment performance assessments of different wetland mesocosms
… constructed wetlands can be hampered by clogging of the substrate media pores of the wetland filters. This clogging usually leads to blockage of filter substrate, progressive diminution of porosity and reduction of active pore volume, permeability and substrate hydraulic conductivity …
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Freeze-Thaw Durability of Pervious Concrete
… during freeze-thaw cycling under different soil clogging and water saturation conditions. The laboratory research associated with this project involved three primary measures of pervious concrete performance, including freeze-thaw durability, compressive strength, and permeability. Testing …
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Artificial Recharge of Groundwater with Recycled Municipal Wastewater in the Pajaro Valley
… inland. As evidenced by several case studies, clogging can be significant in direct injection wells, but well design and maintenance can effectively address clogging. Surface spreading basins require less engineering and have lower operating costs than direct injection, and they are able to …
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Permeability reduction in porous media due to suspended particles
… material by suspended particles, eventually clogging the aquifer. Clogging is the retention of fine particles in a geological formation. This process causes a reduction in pore space, which reduces the aquifer's capacity to store and transmit water. The purpose of this study was to analyze …
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Vibration Enhanced Flooded Bed Dust Scrubber with Liquid-Coated Mesh Screen
… numerous operational challenges including rapid clogging. Furthermore, the current design of the filter panel is not capable of evenly wetting the entire surface area. This allows dust-laden air to pass through the filter media and decreases the cleaning capability of the FBS. In this research, …
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Macroscopic Coupling Conditions with Partial Blocking for Highway Ramps
… effects that arise in standard models, namely clogging of the main highway and vehicle destination changes. We achieve this by tracking vehicle density buildup in the form of a queue, which is modeled by an ODE. We define the solution to the Riemann problem at the junction using the supply and …
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An investigation into the factors affecting the behaviour of Highway Filter Drains, with a particular emphasis on the Scottish Trunk Road Network
… despite their popularity, they are prone to clogging, therefore they have an estimated operational life-cycle of ten-years.This research was undertaken to investigate the complex inter-relationship between catchment characteristics, road dynamics and the physical characteristics of the road …
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A study on the debris found in a pervious concrete sample
… split in half to reveal a cross-section of the clogging layer. When measured, it was revealed that the depth of clogging on these pervious concrete samples was one inch or more in some areas, which contradicts previous research of laboratory clogged samples, that says the maximum depth of …
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Microscale Investigation of the Influence of Interparticle Cohesion on the Macro-Behaviour of Soil
… of repose, shearing under loading condition and clogging behaviour when fluid is involved. Different levels of cohesion between particles are integrated in numerical models and the results are validated against well-known experimental and analytical methods. The results show that neglecting the …
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Hydraulic design of pervious concrete highway shoulders
… to determine hydraulic response when exposed to clogging associated with sand used in roadway de-icing. The results of the clogging of the permeable pavements followed similar trends as the unclogged samples, with the only difference being a more significant reduction in infiltration rates at …
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