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Showing 1 to 20 of 65 for “"multibeam"”.
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Nonlinear vibration of beam and multibeam systems
In this dissertation, an experimental and theoretical investigation into the nonlinear vibration of beam and beam-like structures with rectangular cross sections is presented. Two structures, a cantilever beam subject to a harmonic external excitation and a portal frame subject to a harmonic base …
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Time-Modulated Array Testbed Prototype for Multibeam Spectrometry
… testbed is designed to show the capabilities of multibeaming and interference suppression using time-modulated arrays.</p> <p>To verify the performance of the system, each subsystem underwent specific testing. Once all subsystems are verified, the entire system underwent various experiments to …
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An Investigation of Joint Forces in Multibeam Bridges
Made available in DSpace on 2014-12-08T23:56:00Z (GMT). No. of bitstreams: 1 6406129.pdf: 5767775 bytes, checksum: aa8232c780970e411d04084d5ff77a24 (MD5) Previous issue date: 1963
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Lateral Distribution of Concentrated Loads on Multibeam Highway Bridges
Made available in DSpace on 2014-12-05T17:37:17Z (GMT). No. of bitstreams: 1 6104252.pdf: 6002468 bytes, checksum: a21e4e4640ebdb14a240f8b0506cb1e7 (MD5) Previous issue date: 1961
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Imaging and counting of targets with a high resolution multibeam sonar
… and counting system for a high resolution multibeam sonar. A mathematical model for the operation of the multibeam sonar is derived. The computational model is developed into a simulator for the multibeam sonar in MATLAB.
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Quantitative Comparison of Benthic Habitat Maps Derived From Multibeam Echosounder Backscatter Data
… a growing interest has recently developed for Multibeam Echosounders (MBES). This interest is mainly the result of the multiplicity of these systems’ outputs (that is, bathymetry, backscatter mosaic, angular response and water-column data), which allows for multiple approaches to seabed or …
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Aufbau und Einsatz eines Multibeam Instrumentes zur DOAS-tomographischen Messung zweidimensionaler Konzentrationsverteilungen
… Aufgrund dieser Eigenschaft wird es als Multibeam Instrument (MBI) bezeichnet. Die Nachweisgrenzen, die mit diesem Instrument erzielt werden können, sind vergleichbar denen eines konventionellen DOAS Instrumentes. Multibeam Instrumente wurden erfolgreich bei einer Testkampagne in einer …
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Fabrication and Characterization of Three Dimensional Photonic Crystals Generated by Multibeam Interference Lithography
Multibeam interference lithography is investigated as a manufacturing technique for three-dimensional photonic crystal templates. In this research, optimization of the optical setup and the photoresist initiation system leads to a significant improvement of the optical quality of the crystal, as …
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Using multibeam sonar to monitor animal behaviour and environmental interactions at marine renewable energy sites
… decision for future developments. Through use of multibeam echosounders (imaging sonar) we can observe and record animal behaviour at a fine scale (metres, seconds) drawing comparisons, establishing patterns and evaluating potential changes around MRE sites.<br/>Being able to properly account for …
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THE DYNAMICS OF A TIDAL INTRUSION FRONT IN A NATURAL ESTUARY: EFFECTS ON MULTIBEAM SONAR ACCURACY
… of such a frontal system on the accuracy of multibeam sonar surveys. The front was found to form during spring tides, when the barotropic inflow was sufficient to arrest the buoyant outflow from the estuary. This has been shown to be driven by changes in channel width and depth, creating a …
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Multibeam echosounding as a tool for mapping geologic features, bathymetry and modern vents, Yellowstone National Park, Wyoming
… this terrain over time. This research employed a multibeam echosounder (MBES) in Lewis Lake and Yellowstone Lake, in August 2011, to describe and interpret the geologic and geomorphic processes that have shaped Lewis Lake, as well as enhance our understanding of selected hydrothermally-active …
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The use of multibeam and split-beam echo sounders for assessing biomass and distribution of spring-spawning Atlantic cod in the Gulf of Maine
… on advancing the application of split-beam and multibeam echo sounding to remotely locate and describe spatial distribution, and to provide a relative measure of abundance of the spring-spawning Atlantic cod (Gadus morhua) in the western Gulf of Maine. Specifically, the main objectives of this …
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Seafloor habitat characterization, classification, and maps for the lower Piscataqua River estuary
<p>Data from multibeam echosounders were used to implement segmentations and classifications of the seafloor, and measurements from underwater images and physical samples were used to relate segmentations and predictions to observed seafloor characteristics. Texture analysis, using local Fourier …
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3D visualisation of historic and environmentally significant shipwrecks: the development of occlusion objects, Locoramps and digital cinematography
… the 3D visualisation of point cloud data from multibeam sonar. Case studies were selected as the basis for experimentation; they include HMS Royal Oak in Orkney and SS Richard Montgomery in the Thames Estuary. The author collaborated with a multi-disciplinary team of forensic maritime …
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Multifocal interferometric synthetic aperture microscopy
… solution eliminates artifacts that affect multibeam OCT while achieving better signal-to-noise ratio over the entire image than is possible with single-focus ISAM. We present detailed theory, computer simulation, experimental results and analysis.
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Autonomous underwater vehicle navigation and mapping in dynamic, unstructured environments
… the velocity sensor, the attitude offset of the multibeam acoustic ranging sensor, and the full six-degree of freedom offset of the camera. The system uses pose graph optimization to simultaneously solve for the robot’s trajectory, the map, and the camera location in the robot’s frame, and takes …
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Geomorfologia del Margine Continentale della Sardegna meridionale
… time through high resolution morphobatimetric (multibeam) data not interpolated. Have been defined Geo Risks associated with characteristics of escarpment‟s gravitational processes and the dynamics of channeled flows that affect the evolution of systems of canyons. The multibeam data have been …
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Autonomous underwater vehicle navigation and mapping in dynamic, unstructured environments
… the velocity sensor, the attitude offset of the multibeam acoustic ranging sensor, and the full six-degree of freedom offset of the camera. The system uses pose graph optimization to simultaneously solve for the robot's trajectory, the map, and the camera location in the robot's frame, and takes …
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A Comparison of Spatial Interpolation Techniques for Determining Shoaling Rates of the Atlantic Ocean Channel
… The data used for this research consisted of multibeam and singlebeam surveys. These surveys were taken in a systematic manner of linear cross-sections that produced tens of thousands of data points. Nine interpolation techniques (inverse distance weighting, completely regularized spline, …
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