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 17 of 17 for “"Target geometry"”.
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A 3D Computational Fluid Dynamics Model Validation for Candidate Molybdenum-99 Target Geometry
… an electron beam through a series of 100Mo targets. During this process a large amount of heat is created, which directly affects the operating temperature set for the system. The wall temperature along the target section must be maintained between 550 \u2103 and 650 \u2103. This temperature …
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Characterization of underwater target geometry from Autonomous Underwater Vehicle sampling of bistatic acoustic scattered fields
… classify hazards. Existing acoustic methods for target classification using AUV-based sensing, such as sidescan and synthetic aperture sonar, require an expensive payload on each outfitted vehicle and expert image interpretation. This thesis proposes a vehicle payload and machine learning …
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Characterization of underwater target geometry from autonomous underwater vehicle sampling of bistatic acoustic scattered fields
… classify hazards. Existing acoustic methods for target classification using AUV-based sensing, such as sidescan and synthetic aperture sonar, require an expensive payload on each outfitted vehicle and expert image interpretation. This thesis proposes a vehicle payload and machine learning …
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A laboratory study of the 'shoreline' detected in video imagery
… varying swash zone characteristics and sensor-target geometry found in digital images collected by ARGUS coastal imaging systems. Using a hyperspectral sensor, reflectance data were integrated over the respective red, blue and green wavelengths corresponding to a standard ARGUS video imaging …
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A 2-D Time-Dependent Ripple Prediction Model for Wave Dominated Flows
… equilibrium ripple sub-module that provides the target geometry of the sea bed. Temporal variability of the hydrodynamic conditions causes ripple geometry to lag behind and not always agree with that predicted by existing equilibrium models. The new model has the ability to predict the …
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Relativistic electron beam transport for fast ignition relevant scenarios
… confinement is only a minor effect and the cone target angle is a minimal concern for design considerations. The discrepancy was attributed to a phenomenon known as escaping electrons and the enhanced intensity of electrons measured along the surface was attributed to target geometry, rather than …
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Automatic parallel octree grid generation software with an extensible solver framework and a focus on urban simulation
… provides a 'zeroth' order representation of the target geometry, and as such, no cut-cell algorithm, projection method, or immersed boundary condition are implemented. In this case, 'zeroth' order means that no geometry is ever exactly represented in the final computational mesh: an octree …
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Antenna boresight calibration using optimal estimation techniques
… of the antenna azimuth angle to a fixed radar target are provided by a Target Acquisition Unit (TAU). A measurement of antenna azimuth misalignment is obtained by comparing the TAU-determined antenna azimuth with a computed value based on the IMU position and heading and the known target …
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Methods to program and to probe RNA tertiary structure with nucleic acid origami
… nucleic acid, the scaffold, into a target geometry via hybridization with short oligonucleotide "staples." First, we expanded the geometric space accessible to 3D wireframe DNA-scaffolded origami with edges composed of two helix bundles, optimizing folding conditions and crossover …
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A Computational Framework for Zero Waste Structural Design
… design. In the typical design process a geometry is first determined, and then members are sized to its particular codes and requirements. Oftentimes, to satisfy these requirements, members are iteratively up-sized with the intention to alter them in order to fit within the geometry. By …
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Optimisation of automated gas metal arc fillet welding
… interactions have on the resultant fillet weld geometry and structure. The purpose of this study is to provide an improved understanding of the main GMAW process parameters (current, voltage, travel speed, shielding gas flow rate, electrode, travel angle and gun angle), which can then be applied …
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Multiple-objective sensor management and optimisation
… Management algorithms which aim to optimise target tracking processes. Three principal theoretical and analytical contributions are presented which are related to the manner in which such problems are formulated and subsequently solved.<br/><br/>Firstly, the trade-offs between optimising …
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Computational and Experimental Investigation of Supersonic Convection over a Laser Heated Target
… and validation of simulation of the beam-target interaction to determine the target temperature distribution as a function of time for a given target geometry, surface radiation intensity and free stream flow condition. The effect of a turbulent supersonic flow was investigated both …
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Riemannian geometry for inverse problems in cryogenic electron microscopy
… and new opportunities that a Riemannian geometry-based approach has for and brings to signal processing and recovery problems. In the first part of the thesis we consider how to use ideas from global optimisation on Riemannian manifolds to regularise the orientation estimation sub …
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System design of the MeerKAT L - band 3D radar for monitoring near earth objects
… The maximum dwell time possible for the radar geometry was found to be 30 seconds, with coherent integration limitations of 2 ms and 121 ms for accelerating and non-accelerating targets, respectively. The multistatic and SIMO radar configurations showed sufficient detection (SNR 13 dB) for …
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Development and Validation of a Child Finite Element Model for Use in Pedestrian Accident Simulations
… literature, and then by morphing to the final target geometry. Initially, the material properties of an adult model were assigned to the child model, and then were updated based on pediatric data during the model validation. Since the lower extremity injuries are the most common injuries in …
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Ultrasound and photoacoustic methods for anatomic and functional imaging in image guided radiation therapy
… ability to use US for patient positioning when targeting abdominal structures. We are now testing this on a dog patient to obtain both inter and intra-fractional positional errors.</p> <p>The objective of this experiment is to confirm Hill’s equation describing the relationship between …