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 202 for “"Incision"”.
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Canine cardiopulmonary responses to one-lung ventilation during thoracoscopic diaphragmatic incision repair and two-lung ventilation during gasless laparoscopic diaphragmatic incision repair
… surgical techniques for repair of diaphragmatic incisions and the cardiopulmonary responses during the surgical procedures were investigated in dogs;(1) The cardiopulmonary effects of one-lung ventilation (OLV) during thoracoscopic diaphragmatic incision repair (TDIR) and two-lung ventilation …
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Holocene Periods of Aggradation and Incision, Hanson Creek, Washington
… causes and timing of cycles of aggradation and incision in the Hanson Creek drainage in central Washington provide insight into changes in channel morphology and paleoenvironment within the region over the last 8000 years. Stratigraphically and spatially coincident archaeological evidence …
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Quaternary incision history of the Black Canyon of the Gunnison, Colorado
… Black Canyon. In the last 640ka, average bedrock incision rates surrounding the knickpoint are unbalanced and vary from 130-150 m/Ma (downstream) to 470-600+ m/Ma (within) to 90-95 m/Ma (upstream), necessitating knickpoint migration. The 640ka profile, reconstructed from terraces containing Lava …
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Hemodynamic Assessment of Y-Incision Aortic Root Enlargement Using Computational Simulations
<p>The Yang procedure is a new aortic root enlargement technique used to enlarge the aortic annulus by multiple valve sizes. The procedure prevents patient prosthesis mismatch and establishes a viable platform for future valve-in-valve implantation. This study used the Yang procedure to investigate …
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The role of precipitation on Bedrock Channel Incision in Kauai, HI
Erosion of bedrock channels is frequently modeled with the stream power law, which relates erosion rates to drainage area, slope, and an erosional efficiency coefficient k. The value of k, however, varies with many physical factors and most of these relationships are not well quantified. This study …
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New constraints on the late Cenozoic incision history of the New River, Virginia
… fluvial terraces cut into this fill record an incision history for the river that includes several periods of stalled downcutting and aggradation. Cosmogenic 10-Be exposure dating, aided by mapping and sedimentological examination of terrace deposits, is used to constrain the timing of events …
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Neotectonic evolution of Grand Canyon : interaction between volcanism, river incision, epeirogenic uplift, and faulting
… focuses on the effects of volcanism, river incision, epeirogenic uplift, and faulting on the landscape evolution of the Grand Canyon region. In the first chapter the migration of increasingly asthenospheric basaltic volcanism is used to constrain lithospheric modification of the Colorado …
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Effect Of Stream Channel Incision On The Depth To Groundwater In Riparian Corridors Across Southwestern Minnesota
… corridor. Streams with a higher degree of incision may be less likely to have elevated groundwater tables, making them less effective at removing nitrogen from groundwater. By determining if there is a relationship between site characteristics and groundwater depth in the riparian corridor, …
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Surface uplift, fluvial incision, and geodynamics of plateau evolution, from the western margin of the Central Andean plateau
… in the Southern Hemisphere. Studying canyon incision history as a proxy for surface uplift offers a promising route to understanding how climate and tectonics have interacted throughout the evolution of the Central Andean plateau. In this thesis, a combination of bedrock low-temperature …
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Dissecting the eastern margin of the Tibetan plateau : a study of landslides, erosion and river incision in a transient landscape
… to characterize the rates and processes of river incision and erosion associated with major rivers dissecting the eastern margin; 2) to better understand and constrain the transient landscape evolution that defines regional topography; and 3) to move closer to understanding the relationships among …
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Overcoming unrealistic behavior of landscape evolution models attributed to the stream power incision model: Scale invariance and ultra-sensitivity to initial conditions
… behavior of the most-commonly used bedrock incision model used in LEMs; Chapter 3 compares the sensitivity of numerical LEMs and physical experiments to their initial conditions; and Chapter 4 explores a recently published sub-model that can remedy unrealistic behavior in current LEMs. The …
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Cosmogenic dating of fluvial terraces in the Sorbas Basin, SE Spain
Long term fluvial incision spanning the Late Cenozoic is recorded in many fluvial systems around the world by terrace landform sequences. The incision manifests itself as inset sequences of river terraces which form terrace staircases. The timing of the onset of incision and the rate incision then …
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New incision rates on the Colorado River system based on cosmogenic burial dating of terraces : implications for a transient knickpoint at Lees Ferry and differential uplift of the Rocky Mountains
… Comparison of river profiles and rates of incision between these rivers provides a natural laboratory for resolving controls on river evolution. Disequilibrium profiles in both rivers are evident by numerous knickpoints and convexities. By compiling existing age constraints and applying …
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Holocene Arroyo Cut and Fills Cycles, South-Central Washington
… Washington. The most recent channel incision episode along Selah Creek is primarily attributed to multiple failures of an irrigation reservoir dam during the winters of 1909 and 1910. The modern arroyo exposed evidence of at least one previous episode of arroyo incision to a depth of …
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Feedback between erosional morphology, sediment transport and abrasion in the transient adjustment of fluvial bedrock channels
… explores the dependence of bedrock channel incision on coarse sediment supply through laboratory flume experiments and quantitative field observations of evolving channel morphology. Predictions of the saltation-abrasion model (Sklar and Dietrich, 2004) for sediment flux-dependent channel …
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Modelling surface evolution coupled with tectonics
… and the stream power law to reflect riverbed incision. The 1D SEC settles sediment that was produced by fluvial incision in the appropriate minimum, while the supply-limited 2D SEC DANSER uses a fast filling algorithm to model sedimantation. It is based on a cellular automaton. A …
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Cenozoic tectonic and geomorphic evolution of the Red River Region, Yunnan Province, China
… rate and burial ages indicate a background incision rate of [approximately] 0.05 to 0.10 mm/a, lower than the long-term incision rate minimum of [approximately] 0.26 mm/a. Cosmogenically-determined incision rate approximately doubles to [approximately] 0.20 mm/a in the region of maximum …
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Timing and pattern of valley excavation, Le Sueur River, south-central Minnesota, USA
… central Minnesota, preserve the record of river incision. A combination of airborne LiDAR (light detection and ranging) and terrace dating through optically-stimulated luminescence (OSL) and radiocarbon methods were used to construct a conceptual model of valley excavation during the Holocene and …
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Uranium-series geochronology and stable isotope analysis of travertine from Soda Dam, New Mexico : a Quaternary record of episodic spring discharge and rivern incision in the Jemez Mountains hydrothermal system
… and geologic context with respect to incision rates of the Jemez River and the episodic nature of travertine deposition. The largest volume deposit (deposit A), high in the landscape on the west side of the river, yields stratigraphic ages ranging from >500 ka (outside of U-series …
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