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 170 for “"Direct Measurements"”.
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Direct Measurements of Polyelectrolyte Brush Responses using Atomic Force and Optical Microscopy
In this thesis, so-called ”polyelectrolyte brushes” are addressed. The focus is on the investigation and understanding of the response properties of these polymer surfaces. For that purpose new methods are developed which combine force spectroscopy and optical microscopy. As well, established …
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Simultaneous direct measurements of skin friction and heat flux in a supersonic flow
… By mounting the heat flux microsensor directly on the surface of the floating element of the skin friction balance, it was possible to perform simultaneous measurements of the skin friction and the heat flux. The total thickness of the heat flux microsensor is less than 2 μm, so the …
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Direct Measurements of Two Photon Exchange on Lepton-Proton Elastic Scattering Using Simultaneous Electron-Positron Beams in CLAS
… TPE correction to the Rosenbluth cross section measurements significantly decreases the extracted value of <em>GE</em> and brings it into good agreement with the polarization transfer measurement at <em>Q</em><sup>2</sup>∼1.75 GeV<sup>2</sup>. Thus, these measurements appear to resolve the …
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Direct Measurements of the Effects of Cyclic Adenosine Monophosphate, and Related Compounds, on Membrane Conductances, Intracellular Calcium and Ph in Gastropod Neurons (cyclic-Amp)
… did not prevent the pH response. Multiwavelength measurements of arsenazo III during cyclic AMP injections into voltage clamped cells showed no changes in resting {Ca('2+)} nor in the characteristics of Ca influx or regulation during electrical activity. These results have led to the following …
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The role of denitrification in the nitrogen cycle of New England salt marshes
I used direct measurements of nitrogen gas (N₂ fluxes and a ¹⁵N stable isotope tracer to determine the contribution of denitrification to salt marsh sediment N cycling. Denitrification in salt marsh tidal creekbottoms is a major sink for groundwater nitrate of terrestrial origin. I studied …
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An Experimental re-evaluation of Photon Mass Attenuation Coefficients
… model calculations are widely used. This project directly measured the photon mass attenuation coefficients of water and a number of water based solutions. These measurements were made using a High Purity Germanium (HPGe) detector allowing for increased resolution beyond traditional techniques. …
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The Partial Pressure of Hydrogen Chloride from its Solutions in Phenetole, Diphenyl and N-Butyl Phenyl Ethers and the Calculation of the Heat and Entropy of Solution
From previous work done In this laboratory, the direct measurements of the partial pressure of hydrogen chloride from its solutions which correspond with the law of Henry have been made- in the solvents listed in Table I. These are arranged in the order of increasing Henry law constants.
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The role of denitrification in the nitrogen cycle of New England salt marshes
I used direct measurements of nitrogen gas (N2) fluxes and a 15N stable isotope tracer to determine the contribution of denitrification to salt marsh sediment N cycling. Denitrification in salt marsh tidal creekbottoms is a major sink for groundwater nitrate of terrestrial origin. I studied …
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Mechanisms for enhanced turbulence in the Drake Passage region of the Southern Ocean
… to the remote location and harsh conditions, few direct measurements of turbulence have been collected in the Southern Ocean. Previous studies have used indirect methods based on finestructure observations to suggest that strong mixing is ubiquitous below the mixed layer. Results from a US/UK …
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Phase-sensitive probes of extended topological Josephson junctions
… in S-TI-S Josephson junctions through indirect and direct measurements of the current-phase relation (CPR) using Josephson interferometry. Through indirect observations involving measurements of the maximum supercurrent through the junction versus magnetic flux, we observe entering …
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Nanofabrication using focused ion beam
… with device applications perspective in several directions. Project work included construction of an in-situ FIB electrical measurement system and development of its applications, direct measurements of nanometer scale FIB cuts and fabrication and testing of lateral field emission devices. …
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Continuos Doping of La2CuO4+x Thin Films
… of the scaling relationship are determined by direct measurements on the films.
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Subpixel Resolution Schemes for Multiphase Flows
… Monte-Carlo simulations. These schemes provide direct measurements of the apparent particle image diameter and the subpixel position. The new methods significantly reduce the bias error due to pixel discretization, thus reducing the total error in the position and sizing measurement compared to …
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Exploring the absorption properties and direct radiative impact of atmospheric carbonaceous aerosols
… their adverse effects on human health and their direct and indirect radiative effects on climate, which are significant and very uncertain factors contributing to global climate change. In estimating the direct radiative effect (DRE), the absorption from carbonaceous aerosols, including black …
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Defect Production in Alkali Halide Crystals by Monochromatic X and Ultraviolet Radiation (Photoluminescence, X-Ray Absorption, Spectra, Impurity)
… region of the alpha band, providing the first direct measurements of the F-center production efficiency in this region.
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Dynamics of Driven Vortices in Disordered Type-II Superconductors
… lines driven through planar defects via novel direct measurements of vortex excitations.
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Finite element modeling of temperature elevation due to NIR exposure in neural tissue
… project in the neural interface laboratory, direct measurements of temperature in the rat brain cortex as a response to a pulsed sequence of NIR laser beam are available. In this thesis, finite element modeling approach is used to model and simulate the temperature elevation in neural tissue …
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Wind wave tank for experimental investigation of momentum and enthalpy transfer from the ocean surface at high wind speed
… transfer from the ocean surface and by drag. Direct measurements of drag, evaporation, and sensible heat transfer are not easily performed on the high seas. Therefore, a wind wave tank has been constructed in which a few aspects of a tropical storm are simulated. The air velocity inside the …
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Investigation of current-phase relation in topological insulator Josephson junction
… instead of conventional 2π sinusoidal CPR. Our measurements of the critical current vs magnetic field modulation patterns have shown even-odd node-lifting effect in our TIJJ devices, which we interpret as evidence for a 4π-periodic sin(ϕ/2)-component in the Josephson CPR. This has motivated a …
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