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 151 for “"Surface features"”.
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Atmospheric photochemistry, surface features, and potential biosignature gases of terrestrial exoplanets
… numerical algorithms, the model has desirable features for exoplanet exploration, notably the capacity to treat both thin and thick atmospheres ranging from reducing to oxidizing, and to find steady-state solutions starting from any reasonable initial conditions. These features make the model …
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Icy Satellite Tectonic, Geodynamic and Mass Wasting Surface Features: Constraints on Interior Processes and Evolution
… cannot be reproduced in labs, thus analyzing surface features provides insights to confirm, discount, or improve models. I present the methods used to map and characterize the morphometry of several types of geologic features found on three icy satellites of Jupiter and Saturn, and the …
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Investigation of Small Scale (<50m) Surface Features on Mars' North Polar Cap Using Data from HiRISE
… of Mars host a wide array of small scale (<50m) features likely to be formed by aeolian processes. Taking data from the High Resolution Imaging Scientific Experiment (HiRISE), features less than 50 m over the entirety of the NPLD are characterized and mapped. A 2D Fast Fourier Transform is used …
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Judging a planet by its cover : insights into lunar crustal structure and Martian climate history from surface features
… spacecraft make observations of a planet's surface in the present day, but careful analyses of these data can yield information about deeper planetary structure and history. In this thesis, I use data sets from four orbital robotic spacecraft missions to answer longstanding questions about …
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Silence of the lamb waves
… evaluation (NDE) and in-line control of surface additions of 76[mu]m aluminum and polyethylene terephthalate (PET) films. The ultrasonic waves were used to ascertain properties of these substrates such as the thickness of substrate, applied load, presence of defects (holes/cracks), size …
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Surface textures on pyrope, picroilmenite and chrome diopside from Kimberlite
The examination and interpretation of surface features on pyrope, picroilmenite and chrome diopside from kimberlite gives valuable information on the history of these minerals both during and after kimberlite emplacement. Descriptions and scanning electron photo-micrographs of surface features …
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Using Light Detection and Ranging (LiDAR) Imagery to Model Radio Wave Propagation
… the bare earth topography and do not reflect surface features such as vegetation and buildings. In actuality these surface features can significantly influence near LOS paths and therefore a data set that contains these features can greatly improve the ability to predict commshed areas. LiDAR …
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Exploring grade 12 learners’ graphical interpretation of rate and extent of reaction: a case study of King Cetshwayo district grade 12 learners
… Most of the learners failed to interpret the surface features of the graphs. Interpretations were ranked hierarchical (Curcio’s levels) to measure learners’ graphical literacy and most learners struggled with lower levels. The findings of this study are diagnostic and they assist module …
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Spectral characterization of desert surfaces in Kuwait by satellite data
… of Kuwait. Due to the appearance of many new surface features, a study was necessary to characterize their spectral signatures as detected by Landsat Thematic Mapper (TM) data. A sophisticated image analysis was applied to the Landsat TM scene. An unsupervised classification technique produced …
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A plasma-wall interaction model for the erosion of materials under ion bombardment
… they cannot predict the millimeter-scale surface features that develop after prolonged exposure. In this work, we address this issue by introducing a plasma-material interaction model able to capture the evolution of surface features at the macroscopic scale on materials exposed to plasma …
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Students' revision practices and attitudes in response to surface-related feedback as compared to content-related feedback on their writing
… content of the writing and not the mechanics or surface features. The academic and affective responses of 10th and 11th grade students toward the two kinds of feedback (content-related and surface-related) were assessed using a between-subjects design. For examination of students' affective …
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Thiolate self-assembled monolayers studied with a tuneable infrared low temperature laser driven scanning tunnelling microscope
… tool STM is uniquely able to resolve atoms on a surface. Illuminating an STM with infrared radiation tuned to match modes in the SAM used as the sample provides a unique opportunity to investigate the combination of the well understood character of organic molecules with the atomic scale …
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Analysis of Viewshed Accuracy with Variable Resolution LIDAR Digital Surface Models and Photogrammetrically-Derived Digital Elevation Models
… More detailed models, known as Digital Surface Models (DSMs), are often generated using Light Detection and Ranging (LIDAR) which uses an airborne laser to scan the terrain. In addition to having greater accuracy than photogrammetric DEMs, LIDAR DSMs include surface features such as …
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Late Wisconsinan deglaciation chronology of the Chenango River Valley and vicinity, New York
… it was necessary (1) to evaluate the planar-surface features within the Chenango River Valley and parts of the Susquehanna and Unadilla River valley with respect to the manner of deglaciation (20 to map the surfaicial geology and evaluate the sediments deposited and landforms created (3) to …
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Dorsal hand feature analysis: an aid to forensic human identification
The analysis of anatomical features on the dorsum of the hand has been utilised in forensic investigations for ascertaining anatomical similarities and differences between suspect and offender images, since 2007. This approach was introduced and developed by the team at CAHId, and has primarily …
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Comparative Lineament and Geomorphic Analysis of Chaotic Terrains and Noctis Labyrinthus, Mars
… terrains are a group of polygonally-fractured surface features commonly associated with subsidence due to rapid fluid loss within the subsurface. Polygonal surface patterns are seen at both sites, where geometric topographic highs are bounded by low troughs. Lineaments, topography, and …
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Effects of Distractor Problems and Hints on Transfer and Classification by Young Children (Learning, Preschool, Interference)
… examined. The problem analogs differed in their surface appearance, but shared common relations for goal and solution. The target problems were drawn from a domain which required the combination of separately learned pieces of information in a new way to reach a goal. When the difficult transfer …
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Computer aided analysis of skin lesions
… for reducing the mortality of skin cancer. Surface features, such as texture and pigmentation area from the surface, epi-illumination images of the skin lesions have been well correlated to detect skin cancer. An increase in the lesion's subsurface blood volume has been correlated to early …
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Constitutive Modeling of Friction in Bolted Connections
… force based on contact interactions of surface features and derives parameters from surface scans. While the physics-based model is not completely predictive, results show promising agreement with experiments.
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Simulations of nanoscale spatial disorder
… We created a kinetic simulator for the surface assembly of quantum dots into ordered or disordered monolayers. We utilized a platform for high-precision motion and collision resolution and implemented the behavior of quantum dots on a surface. The simulation demonstrated experimentally …
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