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 23 for “"glass bead"”.
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Osage Glass Bead Use: Archaeological and Ethnohistorical Evidence of Change and Continuity Through the Early Postcontact Era
… through a study of archaeologically recovered glass beads from four post-contact Osage sites in Missouri: the Brown, Plattner, Carrington, and Hayes sites. Contingency table analyses and diversity indices of the bead data are used to test two hypotheses generated by the cultural change …
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Visualizing fluidized beds with X-rays
… and particle tracking to fluidized beds of glass beads, ground walnut shell, and ground corncob operating with a variety of flow conditions. 3-D local, time-averaged gas holdup is calculated from CT data, while dynamic features are captured by X-ray stereography. The results show that CT is …
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NMR studies of carbon dioxide sequestration in porous media
… brine flow through a model porous medium (100 µm glass bead packing) before and after the capillary (residual) trapping of gas-phase CO2 in the pore space. The acquired propagators were compared quantitatively with the corresponding LB simulations. In addition, magnetic resonance imaging (MRI) …
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A Computational Study of the Hydrodynamics of Gas-Solid Fluidized Beds
… to study two-dimensional single solids phase glass bead and walnut shell fluidized beds. Current modeling codes only allow for modeling of spherical, uniform-density particles. Owing to the fact that biomass material, such as walnut shell, is abnormally shaped and has non-uniform density, a …
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Characteristics and modeling of the fracture properties of polymer-silica microparticulate composites via macroscopic scratch tests
… and theoretically. A wax mixture with spherical glass bead inclusions is developed as a model material. The hardness and fracture toughness of composites containing 0%, 5%, 10%, and 20% spherical glass bead inclusions by volume are analyzed using a built-in- house macroscopic scratch test device. …
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Extraction of physically-realistic pore network properties from three-dimensional synchrotron microtomography images of unconsolidated porous media
… were used to verify the algorithms. Systems of glass bead and natural sand were used in this study to investigate the applicability of the algorithms. Additionally, porosity, specific surface area, and representative elementary volume (REV) analysis of porosity were calculated. The impact of …
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Screening for Mutants in the Output Pathway of the Circadian Clock in Chlamydomonas Reinhardtii
… were generated by insertional mutagenesis via glass bead transformation. The plasmid pSP124S containing the ble marker was used to introduce mutations. The CABII-1 gene has been reported to show a circadian rhythm in expression. The reporter gene ARS2 that was transcriptionally fused to the …
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The design of a fluidized bed for testing of a robotic burrowing device which mimics razor clams
… plate, which suspends and fluidizes the glass bead media, leading to redistribution of the substrate and unpacking. The new fluidized bed system has two key improvements over the current system. It improves the redistribution that is needed between each test to reset the substrate. Before …
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A radio-tracer study of the effect of surface finish on the transfer of polychlorotrifluoroethylene sliding on mild steel
… surfaces, abraded (0.81 um - rms) surfaces, and glass bead blasted (1.73 um - rms) surfaces was attributed to an abrasive wear mechanism. An apparent translation to adhesive wear was observed during later stages of transfer. This transition occurred much sooner with the polished surface than with …
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Probability based models for the power draw and energy spectra of a tumbling mill
… Experiments are conducted using dry spherical glass bead charge in a laboratory scale tumbling mill, which is mounted with a torque transducer and tachometer to measure mill power. Particle tracking information from PEPT is used to reconstruct the motion of glass beads and infer the overall …
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An Investigation of Electro-Rheological Fluids in Engineering
… particles, such as cornstarch, zeolite, glass bead or cellulose. When there is no electric field, particles are randomly suspended in the base liquid. When an electric field is applied, the particles in the fluid form chains bridging the conductors of opposite polarity and turn the liquid …
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Investigation of local velocities and phase holdups, and flow regimes and maldistribution identification in a trickle bed reactor
… system flowing over a packed bed of 3 mm glass bead particles. The local liquid and gas velocities, phase saturation and their time series have been investigated for the first time by developing, validating, and implementing a new two-tip optical fiber probe technique. It was found the …
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Literary Perceptions of Leadership
… Billy Budd, Sailor and Herman Hesse's The Glass Bead Game. It has been, for the most part, a study of relationships: between leaders and their followers; between leaders and their gods; and between leaders and heroes. Throughout, the study has attempted to determine whether or not there has …
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An Investigation of the Rheology of Reactive and Nonreactive Highly Filled Polymer Systems
… nonreactive model system consisting of spherical glass bead particles and a polydimethylsiloxane polymer phases were studied in addition to two calcium aluminate cement-polymer systems of technological interest. The relaxation modulus of the three model reactive systems showed distinguishable …
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Structure-property characterisation of ternary phase polypropylene composites
… containing ethylene-propylene rubber (EPR) and glass beads has been carried out. The composite structure was evaluated using various techniques including SEM, DSC, XRD and DMA. While the mechanical tests included tensile and impact measurements at ambient temperature, and a fracture toughness …
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Estimating the concentration of ultrasound contrast agents using ultrasonic backscatter in vitro
… the method were performed with both UCAs and glass bead microspheres in degassed water using a beaker setup and a flow system setup. Experimentally obtained estimates of the BSC were fit to ultrasound scattering models to extract concentration estimates of either the UCAs or the glass beads. …
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Granular flow modelling of rotating drum flows using positron emission particle tracking
… flow models. In this regard, 5 mm and 8 mm glass beads are rotated within a 476 mm diameter mill, fitted with angled lifter bars along the inner azimuthal walls and operated in batch mode across a range of drum rotation speeds that span cascading and cataracting Froude regimes. After …
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Development of a novel micropipette aspiration-based force sensing technique to measure single cell sliding friction
… of this device, we analyse the sliding of a glass bead against three different surface materials across multiple initial normal force values. Experiments are also performed across various sliding speeds and directionalities.The effect of varying load, speed and directionality are compared to …
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EVALUATION OF SEED TREATMENTS ON THE NODULE COMPETENCY OF SOYBEAN INOCULANTS
… number regardless of B. japonicum strain. In the glass bead viability study, the effect of inoculum nutrient solution concentration on the viability of bacterial co-inocula is species-specific and influenced by seed coating material. The growth of Pseudomonas putida strains displayed a dependency …
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