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 920 for “"tracer"”.
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Minimalistický objektově orientovaný "ray tracer"
Práce podává přehled o vykreslování scény pomocí metody ray tracing. Zabývá se jednotlivými aspekty při tvorbě aplikace využívající tuto metodu, jako jsou výpočty průsečíků, výpočet osvětlení apod. Je zde popsán základní algoritmus výpočtu jednoho snímku scény. Detailně jsou rozebrány jednotlivé …
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Action Tracer with Android API
… and execute commands on it. This system, Action Tracer, would be useful in cases where a user may need to train or learn a repetitive motion found in an activity or sport. Such a task needs to be done under supervision and may need to be done away from a coach or therapist. In either situation, a …
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On Single Well Forced Gradient Tracer Tests: Implications of Aquifer Physical Heterogeneity and Tracer Behaviour
Single well forced gradient tracer tests are a potential cost-effective approach to estimate in situ aquifer contaminant fate and transport parameters for use in natural attenuation assessments and remediation schemes. To date dipole flow tracer tests have been used to measure the conservative and …
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Tracer populations in the local group
… This thesis describes how various sets of tracer populations can be used to probe the properties of a variety of galaxies in the Local Group. I begin by describing the extraction of a variable catalogue from the Sloan Digital Sky Survey Stripe 82 dataset and then use the catalogue to select …
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Mixing in the North Atlantic Tracer Release Experiment : observations and numerical simulations of Lagrangian particles and passive tracer
Mixing and stirring of passive tracer and Lagrangian particles in the open ocean was studied through comparison of observations from the North Atlantic Tracer Release Experiment, a numerical model, and existing theory. Based on the observed distribution of tracer during the first six months of the …
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Mixing in the North Atlantic tracer release experiment : observations and numerical simulations of Lagrangian particles and passive tracer
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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The application of tracer techniques in endocrinology
Using a labelled estrogen (radiodibromestrone) it has been demonstrated that none of the body tissues accumulate the steroid to any marked degree. The excretion route was found to be by way of the bile into the intestine . An enterohepatic circulation has been suggested, since some estrone was …
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Isotopic Tracer Studies of Organic Peroxide Decompositions
Made available in DSpace on 2014-12-05T19:38:00Z (GMT). No. of bitstreams: 1 6206130.pdf: 4744222 bytes, checksum: 9d7225c2d543c3ca3c4577b467a576d0 (MD5) Previous issue date: 1962
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Development of hydrogel tracer beads and comparative tracer tests to better understand contaminant fate and transport in karst systems
… of NAPLs in karst aquifers is poorly understood. Tracer tests allow for qualitative characterization of hydraulic flow in the surface and subsurface, but their results may not be applicable to the movement of NAPL for which density plays a critical role. Particulate tracers have been used to …
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Constraining North Atlantic circulation with transient tracer observations
The capability of transient tracers to constrain the ocean circulation in the North Atlantic is explored. Study of an idealized tracer shows that inferences of circulation properties from transient state distributions are impacted by uncertainties in the time-varying boundary conditions and sparse …
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A Lagrangian mean description of stratospheric tracer transport
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology and Physical Oceanography, 1982.
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Constraining the North Atlantic circulation with transient tracer observations
The capability of transient tracers to constrain the ocean circulation in the North Atlantic is explored. Study of an idealized tracer shows that inferences of circulation properties from transient state distributions are impacted by uncertainties in the time-varying boundary conditions and sparse …
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INVESTIGATION OF TRACER GAS VARIABILITY FROM OBSERVATIONS AND MODELS
The variability of the tracer gases CO2 and ozone was investigated utilizing in-situ measurements, satellite retrievals, and model simulations. In the tropical region, using Atmospheric Infrared Sounder (AIRS) mid-tropospheric CO2 retrievals led to the discovery of a signal with a periodicity of …
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Multi-tracer Study for Groundwater Dating in Southern Oman
This thesis reports on a multi-tracer study to investigate the groundwater system in the Salalah Plain in Southern Oman. Hydrogeological studies in this area are of great significance as extensive groundwater abstraction has led to serious environmental problems. To resolve open questions from …
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Generating Surfaces of Variable Eccentricity Within a Ray Tracer
… a basic comprehension of the workings of a ray tracer, a general understanding of three dimensional polynomial surfaces, how this newly implemented root finder functions, and how these concepts enable us to create surfaces of variable eccentricity. Then, examples will be provided to demonstrate …
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Nitrate isotope anomaly as a tracer of biogeochemical processes
… (massindependent fractionation) signature as a tracer of biogeochemical processes. Nitrate δ15N, δ17O and δ18O of water samples collected at the Marano lagoon (Italy) have been analysed, by combining the denitrifier method with the N2O thermal decomposition in a gold furnace. No clear …
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Boron as a tracer for material transfer in subduction zones
Spät-miozäne bis quartäre Vulkanite der vulkanischen Front und der Back-arc Region der Zentralen Vulkanischen Zone in den Anden weisen eine weite Spannbreite von delta 11B Werten (+4 bis –7 ‰) and Borkonzentrationen (6 bis 60 ppm) auf. Die positiven delta 11B Werte der Vulkanite der …
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Aqueous & Non-Aqueous Phase Tracer Migration Through Differing Soil Textures
… (Bromide) and non-conservative (Phosphate) tracers. Experimental data was produced using a laboratory ½ metre scale automated lysimeter designed and constn1cted at Plymouth. The tracers were compared before oil injection, to calibrate differences in soil texture, and after oil injection to …
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