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 67 for “"channel width"”.
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Adaptive Channel Width Allocation for Multihop Wireless Networks with Joint Scheduling and Congestion Control.
North Carolina State University Theses Computer Science.
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Flow resistance corrections for physical models using unit flowrates
… aspect of evaluating flow behavior in open-channel hydraulic models. Flow resistance in open channels is commonly characterized by Manning's resistance equation, where a value of Manning's roughness coefficient n, indicates the magnitude of flow resistance. Physical hydraulic models are one …
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Morphodynamics of multi-thread rivers Theory and Observations of Channel Loops
… in terms of bifurcation angle, upstream channel curvature, length of the downstream bifurcates. The first part of this work focuses on the effect of the differences in channel width between the upstream channel and the bifurcates added together and between the bifurcates themselves. …
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The Effect of Structure and Lithology on Aspect Ratio of Fluvial Channels: A Field-Based Quantitative Study of the New River in Three Geologic Provinces
Fluvial channel geometry is controlled by the interaction of a number of geologic and hydraulic variables. The width of mixed alluvial-bedrock channels generally is a function of discharge, with variations due to local conditions. The aspect ratio (width/depth) of channels is heavily influenced by …
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Meccanismi di formazione dei tubi di lava
… of a solid crust in the central region of the channel, and the formation of a tube when crust widens until it reaches the leve\'es. The Newtonian assumption is considered and the steady state Navier- Stokes equation in a rectangular conduit is solved. A constant heat flux density assigned at …
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Channel characteristics and large organic debris in adjacent burned and unburned watersheds a decade after wildfire, Park County, Wyoming
… few other human activities. This study compared channel conditions between Jones Creek and Crow Creek. The objectives were to: (1) compare channel characteristics and channel stability; (2) compare large organic debris (LOD) characteristics and loading; and (3) identify processes that might …
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Systematic oversteepening in longitudinal profiles of mixed bedrock-alluvial channels at tributary junctions : Appalachians, Virginia
Certain mixed bedrock/alluvial channels located in the Valley and Ridge province of the Appalachians in Virginia were identified as having a pattern of systematic oversteepening of channel gradients at tributary junctions. Where drainage area increased, channel slopes were either increasing or …
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Zinc oxide nanowire field effect transistors for sensor applications
… was achieved in the micro-FETs with 50 $\mu$m channel width. Interestingly, on scaling down the ZnO channel width down to 100 nm, almost two orders of magnitude enhancement in the linear mobility was observed, which reached $\sim$33.75 cm$^2$/V.s. Such increment in the device performance was …
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Meandering rivers morphodynamics - integrating nonlinear modeling and remote sensing
… rivers. The evolutionary dynamics of the channel width, at local and bend scale, as well as the dynamics of bars in meandering rivers represent two major unsettled issues in our present understanding of river meandering dynamics. In this thesis I first provide a systematic methodology for …
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Double-sided microchannel patterning and through-hole production using injection molding of polypropylene
… injection molded polypropylene parts with microchannels and through-holes. The quality of the microchannels and through-holes was observed with optical microscope and SEM images. A part-to-part variation analysis was conducted for ten parts by averaging the channel height, channel width, and …
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Heterogeneity, paleohydrology, and 3D facies architecture of ancient point bars, Ferron Sandstone, Notom Delta, South-central Utah
This study examined ancient exhumed channel belts from the Cretaceous Ferron Sandstone, Notom Delta in south-central Utah. Extensive plan view exposures with local vertical cliff exposures allowed documentation of channel belt dimension, migration pattern (translation versus expansion) and facies …
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Controls on and Morphodynamic Effects of Width Variations in Bed-load Dominated Alluvial Channels: Experimental and Numerical Study
Understanding and predicting the effects of width variability and the controls on width adjustment in rivers has a key role in developing management approaches able to account for the physical, ecological and socio-economical dimensions of a river system. Width adaptation in a river occurs due to …
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Braided rivers: an exploratory study combining flume experiments and the analysis of remotely-sensed data
… and dynamic morphologies as their multiple channels are constantly re-worked. The research reported in this thesis explored a number of properties of braided river form and dynamics and some controlling factors through three individual but complementary research elements. The first research …
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Microchannel Thermal Management Analysis and Simulation Tool for Integration into Electronic Component Design
This study focuses on the use of microchannel cold plates as a thermal management solution. The goal of the study was to build the Microchannel Simulation Library Tool (MSLT), which allows cold plate designers to analyze possible solutions to electronic component cooling. The MSLT relies on a …
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Scales of Bank Roughness and Their Relationship to Bank Erosion Processes
… bank erosion rates and the stabilization of channel width are poorly understood processes. There have been two distinct approaches to the study and prediction of bank erosion rates in natural streams. In order to predict bank shear stresses, scientists either define a reach as being …
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RF energy harvesting using carbon nanotube components
… uses CNT FETs having a gate length of 5 um and a channel width of 1 mm. The antenna input source is modeled as an AC Thevenin voltage source with an output impedance of 50 [omega].
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Numerical Investigation using RANS Equations of Two-dimensional Turbulent Jets and Bubbly Mixing layers
… The behavior of a turbulent jet confined in a channel depends on the Reynolds number and geometry of the channel which is given by the expansion ratio (channel width to jet thickness) and offset ratio (eccentricity of the jet entrance). Steady solutions to the RANS equations for a …
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Study of subthreshold behavior of FinFet
… that the S-factor of the device increases as the channel width, Tfin increases. This is attributed to the fact that the change in the band bending is less than the change in the applied gate voltage. This is only a first order analysis; hence the device is simulated in a device simulator Taurus. …
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Graetz problem for slip flow in a channel in the presence of axial conduction, viscous dissipation and flow work
… hydrodynamically fully developed slip flow in a channel with a constant wall temperature. Slip flow is a good approximation when the Knudsen number, the ratio of the molecular mean free path to the channel width, is less than approximately 0.1. Our analysis includes the effects of viscous …
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Spatial and temporal variability of tide-induced salt flux in a partially mixed estuary
… discharge, fortnightly tidal forcing, and along channel variability are explored. Four river discharge conditions were considered: 1200 m3 s-1, 600 m3 s-1, 300 m3 s-1, 150 m3 s-1. Tide-induced residual salt flux was found to be variable along the channel, with locations of counter-gradient flux …
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