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 41 for “"Density measurement"”.
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Bone Density Measurement via Radiographic Calibration
… We investigated a simple quantitative measurement of the solar, concave aspect of the distal phalanx in the horse, termed the Palmar-Metric (PM). The PM was a significant predictor of solar cup volume (<em>p</em> < 0.001) and negatively correlated with age (<em>r</em><sup>2</sup> = …
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Plasma Electron Density Measurement Using Homodyne and Heterodyne Interferometers
Measurement of the electron density in a plasma using interferometry. Two different interferometer designs, homodyne and heterodyne are studied in two fusion reactor systems namely Tokamak and flow through Z-pinch device.
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An acoustic bubble density measurement technique for surface ship waters
… well suited for determining ship wake bubble density distributions. The theory, considerations, experimental results, and recommendations of this thesis support the application of the dual frequency acoustic techniques to the ship wake problem. Keywords: Theses; Acoustic bubble density …
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Vibrational methods applied to NDT testing and fluid density measurement
… investigated by Hassan into commercial density and viscosity devices. Using narrowly spaced, large area tines a thin lamina of fluid is trapped between them. It stores a large fraction of the vibrational energy which, acting as an inertia load reduces the frequency. Magnetostrictive and …
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Absolute Flux Density Measurement and Associated Instrumentation for Radio Astronomy below 100 MHz
This dissertation reports new measurements of the absolute flux densities of the brightest astrophysical sources visible from the northern hemisphere with O[10%] accuracy between 30-78 MHz. These measurements provide additional confidence in the existing understanding of the flux density spectra of …
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Floc density measurement and the effects of microproperty variations on sludge dewatering characteristics
… one micro property known as floc particle density. Six field and laboratory sludges were subjected to a series of dewatering tests: gravity thickening, centrifugation, and vacuum filtration. Each sludge was analyzed for macro- and micro properties through each stage of dewatering. It was …
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Modeling and Analysis of a Thermospheric Density Measurement System Based on Torque Estimation
… and analyzes an in-situ method for measuring the density of the thermosphere at low Earth orbit (LEO) altitudes in real time. As satellites orbit in the thermosphere, the sparse yet present air perturbs their orbits via the drag force. The drag force is poorly characterized and has a significant …
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Density measurement of OH radicals in non-thermal plasmas by laser induced fluorescence and time-resolved absorption spectroscopy
… of the plasma-induced emission on the absorption measurement. The second setup is dedicated to an improved laser induced fluorescence experiment, which takes advantage of a novel multi-transition excitation scheme. This permits the simultaneous measurements of both the OH density and its ground …
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Integration and characterization of a control and signal processing system for a SERF magnetometer array
… (MEG), magnetic anomaly detection (MAD), dynamic measurements of geomagnetic fields, and MRI signal detection. While numerous architectures are being pursued in the development of high sensitivity magnetometers, optical atomic magnetometers are of substantial interest due to their small size and …
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Using X-ray Imaging Techniques to Determine Density of Foods
<p>Density depends on the experimental technique and structural properties of food. True, apparent and bulk are different types of densities. For porous foods such as baked food products and complex food systems, accurate measurement of density is challenging. Empirical correlations dependent on …
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Creation of a Spatial Decision Support System as a Risk Assessment Tool Based on Kentucky Tornado Climatology
… using Tornado Days rather than taking a crude density measurement. The SDSS hosts GIS web services that are displayed on an Adobe Flex application. The web application allows users to view, research, query and extract information from the attributes of the GIS files. There is also a dynamic …
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SLM 125 Single Track and Density Cube Characterization for 316L Stainless Steel
… fully dense parts and determining a reliable density measurement technique that is accessible for operators at our university. Our results show that the previously determined optimized scan speed and laser power can consistently create parts with >99.5% density over a range of sizes using an …
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Spectroscopic Study of Compressible Mobile Phase and Stationary Phase Behavior in Chromatography
… by a lack of understanding of the mobile phase density gradient. Mobile phase compressibility leads to gradients in linear velocity and solute retention and affects separation speed and efficiency, especially in packed columns. This work describes on-column density measurement of CO2, a common …
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Neutron scattering investigations on the liquid-liquid transition in deeply cooled confined water
… understood if one accepts that a first-order low-density liquid (LDL) to high-density liquid (HDL) phase transition exists in the deeply cooled region (below 230 K) of water. However, the experimental test on the LDL and HDL in bulk water is practically difficult due to the crystallization below …
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Synthesis and characterization of next-generation multifunctional material architectures : aligned carbon nanotube carbon matrix nanocomposites
… parameters were evaluated using an apparent density measurement, polymer re-infusion modeling, and CNT quality analysis, which elucidate the limitations of the processing parameters currently used to fabricate CNT A-CMNCs. Theoretical tools developed to help quantify and analyze the …
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Investigation of fluid properties at non-ambient conditions
… removed from ambient was identified. A series of measurements of the pressure-volume-temperature relations of diesel fuels was undertaken using a Micro-PVT apparatus at pressures to 300MPa in the temperature range 25 to 75°C. A new calibration procedure for this instrument was devised to enable …
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Microwave Interferometer and Refractometer for the WB-8 Polywell Fusion Device
… interferometer which will give a line average density measurement of a chord through the plasma. The rate at which ions take part in a fusion event depends heavily on the density, making the interferometer measurements vital in assessing the progress made with WB-8. In order to take density …
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Design of experimental apparatus for generation and measurement of an aerosol
… Current methods of aerosol production and measurement with pros and cons are given to justify the adaption of the selected method for our system. Chapter 2 discusses about the theory of ultrasonic atomization and evidence of faraday instability for atomization. Later setup of aerosol …
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Electromechanical resonators as measuring transducers
… for various applications. Designs for the measurement of fluid density and tension have been produced. The principle of the design of the resonator for fluid density measurement is a thin gap (trapping a lamina of fluid) between its two members which vibrate in antiphase.An analysis of the …
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Langmuir Probe Instrument Suite for Mesosphere Turbulence Experiment Mission
… diagnostic technique, and is arguably the only measurement technique that is universally own on every sounding rocket investigation. Earth's mesosphere region (80-120 km) is a host of many dynamic phenomena such as the noctilucent clouds, breaking gravity waves, inversion layers, settlement of …
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