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 110 for “"Fine Particles"”.
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Advanced Chemical-Mechanical Dewatering of Fine Particles
… and applied for the purpose of dewatering fine particles. Three different types dewatering reagents were tested in different filtration and centrifugation units. These chemicals included low-HLB surfactants, naturally occurring lipids, and modified lipids. Most of these reagents are …
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Solids motion in fluidised beds of fine particles
… for the past 70 years, the interaction between particles and rising bubbles and the general solids motion in bubbling fluidised beds are still not fully understood. The work presented in this thesis uses the method known as Positron Emission Particle Tracking (PEPT) to track the motion of a …
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Cycling of fine particles between water and sediments
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1990.
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Disruption of microorganisms due to agitation in slurries of fine particles
… of microorganisms when agitated in slurries of fine particles in a stirred tank. The most widely used industrial process involving agitation of microorganisms in slurries of particles in stirred tanks is the biooxidation process. Mixed cultures of thiobacilli are used in stirred tank reactors …
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Investigating the pH of atmospheric fine particles and implications for atmospheric chemistry
Particle acidity is a critical but poorly understood quantity that affects many aerosol processes and properties, including aerosol composition and toxicity. In this study, particle pH and water (which affects pH) are predicted using a thermodynamic model and measurements of RH, T, and inorganic …
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Dispersion of fine particles by wave-induced mass transport near a circular island
… to speculate qualitatively on the transport of fine particles near a round island in a diffracted wave field.
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The application of laser measurement techniques to the pneumatic transport of fine particles
… from a low powered laser is scattered by seeding particles in the fluid which are small enough to follow the flow. The resulting Doppler shift of the scattered light is proportionate to the velocity of the particles and hence, to the velocity of the fluid. When solid particles are conveyed …
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Composition of fine and ultra-fine particles and source identification by stable isotope ratios
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1998.
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Controlled Human Exposures to Concentrated Ambient Fine Particles and Ozone: Individual and Combined Effects on Cardiorespiratory Outcomes
… air pollutants that have been identified include fine particulate matter (PM) and ozone (O3), both major contributors to smog. However, there is a lack of understanding of the mechanisms involved and the relative contributions of individual pollutants. A controlled human exposure facility was used …
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Pressure drop and flow characteristics for the pneumatic transport of fine particles through curved and straight circular pipes
… the flow properties of a gaseous suspension of fine particles are reported. The objective of the work has been the acquisition of extensive experimental data, the analysis of which provides a better understanding of the pressure drop and flow characteristics of pneumatically transported solid …
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The Role of Leaf Litter and Small Wood in the Retention of Fine Particles During Storms in an Appalachian Headwater Stream
… to reduce the capacity of the stream to retain fine particulate organic matter, FPOM. However, leaves are also a major source of FPOM. I studied the effect of leaf exclusion on FPOM transport by field sampling and by generating computer simulations of particle transport in the stream. Sampling …
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Ultra-fine particle formation using principle of rapid expansion of supercritical solutions`
… solution is rapidly expanded through a well-defined nozzle which leads to formation of ultra-fine particles. An extensive parametric study was conducted in order to obtain an optimized set of experimental parameters to formulate ultra-fine particles with narrow particle size distribution. …
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Hydrodynamic and gasification behavior of coal and biomass fluidized beds and their mixtures
… and gasification behavior of Geldart A particles using CFD. An extensive Eulerian-Eulerian numerical study was executed and simulations were compared and validated with experiments conducted at Utah State University. In order to improve numerical predictions using an Eulerian-Eulerian …
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Carbo-nitride precipitation and its effect on matrix transformations in high strength-high toughness 300M steel
… temperature alter the microstructure, the fine (<600 nm) precipitate population and subsequently the fracture toughness. The reduced volume fraction of fine particles increased the hardenability of the steel, resulting in an increased percentage of upper bainite, that led to a lower temper …
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Permeability reduction in porous media due to suspended particles
… of the aquifer 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 …
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Analysis of hydrodynamic drag forces acting on suspended fine particle in porous media
… involves the interactions between suspended fine particles and the moving fluid at Stokes limit. Historically, due to the complicated geometries of porous media, researchers have had to resort to simplifying assumptions to conceptualize the underlying physics. However, the advent of high …
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Effect of Amines as Corrosion Inhibitors for a Low Carbon Steel in Power Industry
… the presence of a free-crack layer formed by fine particles in that set. FTIR showed that DBU apparently favored the formation of magnetite. It is believed that fine particles impede intrusion of aggressive ions into the metal surface by forming a barrier layer. FTIR demonstrated that DMA …
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Suspended Particles as Photoelectrochemical Systems
… on the fundamentals concerning three types of fine particles that can serve potentially as minute photoelectrochemical reaction centers in form of suspensions have been carried out for InP powders, colloidal CdS, and tris(2,2'-bipyridine)ruthenium(II) complex assembled in particles of zeolite X …
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Effect of particle size on slugging fluidised beds
… fluidising fluid in all cases was air and the particles used were sand, quartz, ballotini and catalyst. The range of particle sizes was about 30 to 500 microns. Column diameters of 1 to 4 inches were used. Much of the work is concerned with the varying behaviour of slugs in beds of different …
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Development of environmentally benign microencapsulation with polymer microspheres and liposomes
… systems and polymer based encapsulation of fine particles in supercritical CO_2 were studied. Compared to many other microencapsulation methods, these two methodologies feature reduction/prevention of using organic solvents, making them particularly attractive as green technology. For …
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