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 98 for “"Particle Concentration"”.
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Characterisation and prediction of particle attrition in lean phase pneumatic conveyors: the influence of particle concentration
This thesis aimed to determine the influence of particle concentration on the magnitude of measured particle attrition within horizontal, homogeneous lean phase pneumatic conveying systems. Furthermore, to propose a characterisation method for predicting the magnitude of particle attrition in such …
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Numerical Simulations of Two -Way Coupling Effects in a Particle-Laden Turbulent Pipe Flow, And, Evaluation of the Equilibrium Eulerian Approach for the Evolution of Particle Concentration in Isotropic Turbulence
… of the equilibrium Eulerian approach to study particle preferential concentration and settling velocity in isotropic turbulence. The equilibrium Eulerian approach is extended to evolve the particle concentration for varying particle response time and still-fluid settling velocity. Over the …
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Segregation of granular particles in suspension flow
… development of longitudinal stripes of granular particles due to instabilities in particle suspension flow. Research was conducted to characterize environmental phenomena related to granular flows, namely avalanches, mudslides, and the movement of glaciers. Results show the stripes were found to …
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Physical properties, evaporation and combustion characteristics of nanofluid-type fuels
… are liquids with stable suspension of nanoparticles. Limited studies in the past have shown that both energetic and catalytic nanoparticles once mixed with traditional liquid fuels can be advantageous in combustion applications, e.g., increased energy density and shortened ignition delay. …
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Scavenging and transport of thorium radioisotopes in the North Atlantic Ocean
… removed from the ocean by attachment to settling particles, a process referred to as “scavenging.” Radioisotopes of thorium, a highly particle-reactive element, have been used extensively to study scavenging in the ocean. However, this process is complicated by the highly variable chemical …
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Scavenging and transport of thorium radioisotopes in the North Atlantic Ocean
… removed from the ocean by attachment to settling particles, a process referred to as "scavenging." Radioisotopes of thorium, a highly particle-reactive element, have been used extensively to study scavenging in the ocean. However, this process is complicated by the highly variable chemical …
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Electrodeposited metal matrix nanocomposites as thin films and high aspect ratio microstructures for MEMS
… are identified in the kinetic regime. Low particle loading (12.5 g/L) results in an inhibited copper rate, while, high particle concentration (60 g/L) does both, inhibits the rate at low overpotentials and accelerates it at higher overpotentials, depending on the electrode rotation rate. At …
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Experimental investigation of constant volume sulfur dust explosions
… dispersion and uniformity by measuring the particle concentration with spatial and temporal resolution. The two-dimensional measurement provided a methodology to increase the number of line-of-sight measurements (i.e. number of samples) such that the mean concentration was statistically …
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Marine particle dynamics : sinking velocities, size distributions, fluxes, and microbial degradation rates
… camera system was employed to capture images of particles in the water column. The subsequent analysis of these images allowed for the determination of the particle concentration size distribution at high spatial, depth, and temporal resolutions. Drifting sediment traps were also deployed to …
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Marine particle dynamics : sinking velocities, size distributions, fluxes, and microbial degradation rates
… camera system was employed to capture images of particles in the water column. The subsequent analysis of these images allowed for the determination of the particle concentration size distribution at high spatial, depth, and temporal resolutions. Drifting sediment traps were also deployed to …
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Acoustic measurements of flowing and quasi-static particulate suspensions
Flowing suspensions of solid particles in gas can be found in various industrial applications, as a method for transporting powdered solids (known as "pneumatic conveying"). The problem of measuring the mass concentration of the solid fraction has not yet been satisfactorily resolved. This thesis …
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Oro taršos tyrimas Kuršėnų mieste rugsėjo- gruodžio mėnesiais /
… An observation program was designed and particle concentration measurements in Kuršėnai city through September to December were performed. Problematic territory and the reasons of particle pollution are identified. Conclusions and recommendations on how to improve the situation are …
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Effect of particles on evaporation of droplet containing particles
The evaporation of droplet containing insoluble particles has grown into an active area of research due to the needs for nanofluids for applications in heat transfer, combustion, and manufacturing desired micro/nano particles in the pharmaceutical industry. The evaporation of droplets containing …
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Cytotoxicity of Galvanically Coupled Magnesium and Titanium Particles for Therapeutic Effect
… via sputtering enhanced the cytotoxicity of Mg particles due to increased corrosion rate. Mg and Mg-Ti particles were characterized using scanning electron microscopy (SEM), which showed that Mg and Mg-Ti particles have the average diameter of 50 µm, which makes them slightly larger than an …
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Lipoprotein Subclass Measurements by an Updated Nuclear Magnetic Resonance Spectroscopy Method in the Prediction of Coronary Artery Disease in Type 1 Diabetes
… recommend increased efforts to keep LDL concentrations within target as a means of subsequently reducing the incidence of atherosclerosis, especially among individuals with diabetes1. </p><p>However, the role of high density lipoprotein (HDL) cholesterol in the development of …
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Novel Techniques for Quantifying Secondhand Smoke Diffusion into Children's Bedroom
… the impact of intervention on flow of smoke air particle concentration from the main room where smoking generates air particle contamination to a room where a child living in the home sleeps. The paper also explores potential modelling techniques to proactively identify and the impact of the …
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Are distinct particle spectra an indication of the state of the phytoplankton community in St Helena Bay?
The potential of phytoplankton particle spectra to be used as the basis for an indicator of the suitability of feeding habitat for fish recruits in the Southern Benguela was investigated. Phytoplankton samples collected on regular cruises on the St Helena Bay Monitoring Line (SHBML) off Elands Bay …
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THE INFLUENCE OF SURFACTANTS ON THE SORPTION OF PHENANTHRENE IN NATURAL WATERS
… is the first to employ environmentally realistic concentrations of surfactants and to use natural particles in order to determine how changes in surfactant behaviour impinge on the sorption of a representative PAH to sediment. The experimental method employed involved tracing the solubility and …
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Fluorescent Biological Aerosol Particles in Coastal Canada and the Link to Atmospheric Ice Nuclei
… the measurement of ice nucleation activity of particles in immersion mode. The WIBS measures the concentration and properties of individual fluorescent particles suspended in the air, which can serve as a proxy for airborne biological particle content. Particles shown to be fluorescent by the …
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Magnetic and Mechanical Properties of Ultrasoft Magnetorheological Elastomers
… composite materials consisting of magnetic particles embedded in a non-magnetic elastomeric matrix, can reversibly modulate their mechanical and magnetic properties through tuning the applied magnetic field <em>H</em>. Recently, ultrasoft MREs have received tremendous attention due to their …
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