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 204 for “"in-situ measurements"”.
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In situ measurements on a model pile in clay
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1984.
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In-situ measurements of the Liquid-Phase Sintering of Zinc Oxide
Polycrystalline ceramic semiconductor devices based on ZnO and several additive oxides show highly non-ohmic current-voltage behavior similar to the Zener diodes. The devices act as an insulator up to a certain electrical field called the breakdown field (EBR) but change into a highly conducting …
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Combining In Situ Measurements and Advanced Catalyst Layer Modeling in PEM Fuel Cells
Catalyst layer modeling can be a useful tool for fuel cell design. By comparing numerical results to experimental results, numerical models can provide a better understanding of the physical processes occurring within the fuel cell catalyst layer. This can lead to design optimization and cost …
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A STUDY OF OPTICAL, PHYSICAL AND CHEMICAL PROPERTIES OF AEROSOLS USING IN SITU MEASUREMENTS
Using a simple sampling apparatus, aerosol particles were collected on a polycarbonate substrate in various locations around the world. The focus of this study was Xianghe, China, an industrial town 70 km southeast of Beijing. The Nuclepore filters were collected in two size ranges (coarse, …
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Radical probe system for in-situ measurements of radical densities of hydrogen, oxygen and nitrogen
… methods to identify presence of radical species in vacuum chambers are optical methods, which suffer from the lack of spatial resolution and require expensive optical equipment. In this study Center for Plasma Material Interactions (CPMI) at the University of Illinois developed an in-situ …
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In-situ measurements and calculation of radon gas concentration and exhalation from a tailings mine dump
In Africa as well as in the world, South Africa plays an important role in the mining industry which dates back almost 120 years. Mining activities in South Africa mainly take place in Gauteng Province. Every year millions of tons of rocks are taken from underground, milled and processed to extract …
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In-situ measurements of radon concentrations in soil gas at a site on the Cape Flats
Measurements of radon (222Rn) concentration in soil gas are routinely used to locate geological fault zones. This study was undertaken to investigate the systematic effects that influence radon soil-gas measurements, in preparation for the first such fault zone measurements in South Africa. The …
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Convective Transport of Tropical Marine Boundary Layer Species into the Upper Troposphere and Relation to Species Lifetime: In Situ Measurements and Global Model Simulation
<p>This study investigates the influence of tropical deep convection on distribution of trace gasses in the tropical upper troposphere (UT) using data from the Convective Transport of Active Species in the Tropics (CONTRAST) Experiment conducted over the tropical western Pacific during January and …
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In Situ Structural Study of Underpotential Deposition and Electrocatalysis on Gold(111) Electrodes
… of the atomic force microscope (AFM), the scanning tunneling microscope (STM), and the surface x-ray scattering (SXS) to these UPD studies has provided in situ measurements from which we investigate factors that determine UPD surface structures and correlate these structures with surface …
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Stomatal and nonstomatal responses of photosynthesis to water deficits and chilling
… to photosynthesis to water deficits and chilling. Photophosphorylation was studied as a potential limitation since its fragile and highly integrated nature makes it a prime candidate for disruption by unfavorable environmental conditions and because it had been implicated in earlier in vitro …
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Plasma velocities in the Heliosheath and the influence of the interstellar wind
A new coordinate system (Interstellar Heliospheric Coordinates, or IHC) is introduced to enable the detailed study of the influence of the interstellar wind on the heliosheath. Recent, in situ measurements of plasma velocities in the heliosheath by Voyager 2 are projected into the IHC system and …
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Optical Remote Sensing of Airborne Particulate Matter to Quantify Opacity and Mass Emissions
During the second stage of this research, a technique was developed to obtain in-situ measurements of PM mass emissions for the dust plumes that are generated from unique military activities. The method was then tested in the field to measure dust emissions from artillery back blast and tracked …
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Coastal surface circulation of the Gulf of Cadiz from satellite altimetry measurements
The main objective of this thesis is to contribute to the understanding of coastal zone dynamics using high-resolution altimetry data. The study evaluates the possibility of studying mesoscale surface circulation in coastal areas, particularly in the Gulf of Cadiz, Spain, using high-resolution …
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Autonomous Underwater Vehicle (AUV) path planning and adaptive on-board routing for adaptive rapid environmental assessment
In shallow water, a large part of underwater acoustic prediction uncertainties are induced by sub-meso-to-small scale oceanographic variabilities. Conventional oceanographic measurements for capturing such ocean-acoustic environmental variabilities face the classical conflict between resolution and …
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The yield strength of molybdenum under pressure and temperature
… high pressures and temperatures is important in planetary science as well as giving a more comprehensive understanding of material properties in general. Molybdenum was subjected to pressures of 20 GPa and temperatures of 423 K. In situ measurements of the pressure variation across molybdenum …
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ΑΡΙΘΜΗΤΙΚΗ ΜΕΛΕΤΗ ΤΗΣ ΤΡΙΔΙΑΣΤΑΤΗΣ ΠΑΡΑΚΤΙΑΣ ΚΥΚΛΟΦΟΡΙΑΣ ΜΕ ΑΛΓΕΒΡΙΚΟΥΣ ΜΕΤΑΣΧΗΜΑΤΙΣΜΟΥΣ
THE COVERNING EQUATIONS AND BOUNDARY CONDITIONS DESCRIBING THE COASTAL HYDRODYNAMIC WIND-INDUCED CIRCULATION ARE PRESENTED. A SHEARING ALGEBRAIC TRANSFORMATION IS INTRODUCED FOR NUMERICAL SOLUTION OF THE MATHEMATICAL MODEL, WHICH IS CREATING A BOUNDARY FITTED CURVILINEAR COORDINATE SYSTEM. THE …
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Satellite indices of fluvial influence in coastal waters
<p>In this dissertation a suite of satellite, discharge and in-situ measurements is used to explore the spatio-temporal distribution of terrestrial constituents in coastal environments. The covariance between riverine delivery of optically active constituents and the corresponding optical …
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