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 20 for “"Particle removal"”.
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PARTICLE REMOVAL IN FLOC BLANKET CLARIFIERS VIA INTERNAL FLOW THROUGH POROUS FRACTAL AGGREGATES
… water treatment train. The mechanism of primary particle removal in floc blanket clarifiers was characterized via size-based performance curves obtained from light blocking particle counters that measured the effluent of a laboratory-scale floc blanket clarifier treating synthetic raw water. …
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Adapting Consumer Report's product evaluation methods for particle removal, gravity non-electric and reverse osmosis water filters in the Indian marketplace
… of three categories of filters: Conventional Particle Removal (cloth and mesh), Gravity Non-Electric (GNE) and Reverse Osmosis (RO) water filters. In total, 16 models were tested. The challenge water for all filter testing had these characteristics: 40+/-10 NTU turbidity and 1500+/-150mg/L …
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Bench-scale evaluation of an energy efficient acoustic aerosol purification device with a newly designed bioaerosol testing and evaluation chamber
… air (HEPA) filters capable of removing 99.97% of particles larger than 0.3 μm in diameter. These filters have high associated energy costs due to pressure drop and can become contaminated with potentially hazardous material during normal operation. Hence, it is important to test alternative low …
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Synergistic Environmental Aging of Glass Reinforced Polymer Composites
… simulations of hydrodynamic effects, and complex particle removal analyses. In the UV radiation modeling part of the simulations, flat and sinusoidal polymer surfaces were numerically modeled for their UV damage as a function of UV intensity, surface topography, and exposure time. The results …
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Ghana's regional development in economics, education and natural resources, with a case study on customers' preferences for household water treatment & safe storage products
… and without the impact of the price. In general, particle removal products are more popular than the chemical products. Interviewees are concerned about the size (either too big or too small) of the particle removal product and are aware of the side effects of chemical products. MDG Target 7.C is …
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Transient Study of Turbulent Flow and Particle Transport During Continuous Casting of Steel Slabs
… velocities, the motion and capture of impurity particles during continuous casting were simulated using a Lagrangian approach. A criterion was developed to model particle pushing and capture by the solidifying shell and was incorporated into the particle transport model. The criterion was …
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Effect of stress on initiation and propagation of localized corrosion in alumninium alloys
… by the presence of different intermetallic particles. In this study, the effect of applied stress and the role of intermetallic particle removal by surface treatment on the initiation and propagation of localized corrosion are investigated. It was found that applying a stress to as polished …
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Fundamental Study of Particle Formation, Transport, Deposition and Filtration for Semiconductor Applications
… EUV lithography system. As a result, the particle size of interest becomes smaller. Preventing and controlling particle contaminations is essential in the semiconductor manufacturing process to increase semiconductor yield. Examples of these unwanted nanoparticles in the semiconductor …
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Improving the indoor air quality (IAQ) through application of the air cleaning technologies for offices building simulated in environmental chamber
… flow rate, pressure drop, CO2 concentration and particle matters PM 10 and PM 2.5 concentration for upstream and downstream were considered in this study. These variables were measured inside the chamber using IAQ devices and these data were used as an input data for simulation by using ANSYS …
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Pilot study of horizontal roughing filtration in northern Ghana as pretreatment for highly turbid dugout water
… to address this issue; to characterize dugout particle sizes and distribution and to test a pilot horizontal roughing filter's (HRF) effectiveness at removing turbidity from highly turbid dugout water. Among the four dugouts tested in NRG, they typically have high concentrations of …
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The Kinetics of Particulate Substrate Utilization by Bacterial Films
… expression capable of describing the removal of particulate chemical oxygen demand (PCOD) from wastewaters in biological film systems. In this context, organic particles that are maintained in suspension (i.e., not removed during normal settling) are the focus of experimentation, …
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Nutritional regulation of egg production of Calanus Finmarchicus in the North Atlantic
… to account for microzooplankton grazing in particle removal experiments was developed.<br/>Balanced physiological budgets were compiled for C. finmarchicus in both seasons. The input terms of these budgets consisted of ingestion and the use of biomass, and the outputs were growth, …
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Experimentally Derived Sticking Efficiencies of Microparticles using Atomic Force Microscopy: Toward a Better Understanding of Particle Transport
… how microorganisms and other colloidal particles attach to and detach from natural sediments and ultimately how they travel through porous media. Sticking efficiency (alpha) is a major component of most particle transport theories. It is defined as the ratio of particles that adhere to a …
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Studies of Turbulent Round Jets Through Experimentation, Simulation, and Modeling
… ability to remove different types of explosive particles from a glass surface. Theoretical analysis revealed trends and enabled modeling to improve the predictability of particle removal for various jet conditions. The second part of thesis aims at developing a non-intrusive measurement …
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Simultaneous removal of sulfur dioxide and nitric oxide from gas streams via combined plasma photolysis
… and removed from the gas stream by an aerosol particle removal device. Experimental results indicate that the SO$\sb2$ and NO removal efficiencies with DBDs are sensitive to (H$\sb2$0$\sb{\rm (g)}$), (O$\sb2$), (CO$\sb2$), and the temperature of the gas stream. When a sufficient voltage is …
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Particle-resolved aerosol modeling on the regional scale – insights into importance of capturing aerosol mixing state
Aerosol particles in the atmosphere are complex mixtures of different chemical species, and their compositions are constantly evolving as coagulation and multiphase processes act on the particle population. The particles interact with the climate system directly by scattering and absorbing solar …
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Removal of organic contaminants from lithographic materials
… limited in the sub-micron range of contaminant particles due to lack of transport of sufficient liquid chemical to the surface in order to achieve satisfactory particle removal. According to the International Technology Roadmap for Semiconductors (ITRS), the photomask must be particle free at …
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Understanding and Predicting Water Quality Impacts on Coagulation
… challenges in achieving targeted contaminant removal and predicting coagulation outcomes. A critical literature review describes factors affecting the hydrolysis reactions of metal salt coagulants and the resulting precipitates. Properties of two key contaminants, turbidity and natural organic …
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CONTROL OF CAVITATION USING DISSOLVED CARBON DIOXIDE FOR DAMAGE-FREE MEGASONIC CLEANING OF WAFERS
… formulations. Megasonic cleaning, or the removal of contaminants particles from wafer surfaces using sound-irradiated cleaning fluids, has been traditionally used in the semiconductor industry for cleaning of wafers. Recently however, advancing technology and miniaturization has made wafer …
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Characterization of microporous ECTFE membranes exposed to different liquid media and ?-radiation and nanoparticle microfiltration through such membranes
… for virgin and TOA-soaked membranes; filtrate particle size distributions agreed well with estimated pore sizes. The values of permeance (kg/m2-s-kPa) determined from the slope of the linear plot of filtration flux vs. the applied pressure difference across the membrane, were 0.39, 0.23 and …