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 12 of 12 for “"array structures"”.
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Grid Inference and Partial Scan Registration for Intelligent Collaborative Robot Systems
… robot systems through leveraging the geometry of array structures to perform online inference of object locations and registering partial in-hand scans to automatically orient objects. This research will automate portions of the data annotation process required for the robots’ deep intelligence, …
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Reconfigurable Resonant Cubic HF Phased Array for In-Space Assembly Operation
Conventional two-dimensional phased arrays face two major shortcomings: the presence of ambiguities in direction of arrival measurements and beam broadening endfire effects. The literature provides methods for addressing and minimizing these problems on conventional planar phased array structures, …
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Simulation of a Wireless Communication Channel to Determine a Best Topology for a Base Station Array Antenna
This thesis presents simulation data on array operation in wideband communication systems. It is shown that array structures with closer inter-element spacing outperform structures with much larger inter-element spacing. It is also shown that circular structures outperform linear structures. This …
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Development of optical field emitter arrays
… theoretically developed optical field emitter arrays that are suitable for use as the electron source for this novel X-ray source. Studies of several optical field emitter array structures, including vertically-standing gold nanopillars and silicon tips, in-plane gold nanostructures, and …
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Al/Al2O3 microchannel plasma chemical reactor for ozone synthesis
Ozone is produced efficiently in arrays of linear microplasmas at low temperatures and generated within alumina (Al2O3) microchannels. The array of microchannels device is fabricated from aluminum foil by chemical processing and mechanical ablation with photolithographic steps. Channels with 3 cm …
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Theory and Design of Spatial Active Noise Control Systems
… are: (i) design of compact planar microphone array structures capable of recording 3D spatial sound fields, so that the noise field can be monitored with minimum physical intrusion to the quiet zone, (ii) derivation of a Direct-to-Reverberant Energy Ratio (DRR) estimation algorithm which can …
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Theory and Design of Spatial Active Noise Control Systems
… are: (i) design of compact planar microphone array structures capable of recording 3D spatial sound fields, so that the noise field can be monitored with minimum physical intrusion to the quiet zone, (ii) derivation of a Direct-to-Reverberant Energy Ratio (DRR) estimation algorithm which can …
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Deep localized hyperthermia with ultrasound-phased arrays using the pseudoinverse pattern synthesis method
… in the treatment volume using ultrasound phased arrays. This method, called the pseudoinverse pattern synthesis method, reduces the pattern synthesis problem to one of estimating the minimum-norm least-square solution to a matrix equation of the form, Hu = p, where u is the array excitation …
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Model order reduction of electro-thermal MEMS
… whose size, due to increasingly complex microstructures, easily exceeds 100,000 degrees of freedom (DOF), i. e. ordinary differential equations. Although modern computers are able to handle engineering problems of this size, the system-level simulation would become prohibitive if full models …
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Adaptive and Robust Multi-Gigabit Techniques Based MmWave Massive MU-MIMO Beamforming For 5G Wireless and Mobile Communications Systems. A Road Map for Simple and Robust Beamforming Scheme and Algorithms Based Wideband MmWave Massive MU-MIMO for 5G Wireless and Mobile Communications Systems
… error rates, low-resolution ADCs/DACs, antenna array structures and sum-rate performances of a single cell downlink broadband millimetre-wave (mmWave) systems with orthogonal frequency division multiplexing (OFDM) modulation and deploying multi-user massive multiple inputs multiple outputs (MU …
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Structural-Electromagnetic Simulation Coupling and Conformal Antenna Design Tool
… Most airborne systems utilize antenna arrays that are installed inside the moldline of the aircraft or in radomes that protect the array from in-flight loads. While externally-mounted arrays can offer the advantage of larger apertures, sensor-vehicle interactions often result in …
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Unified conformal/nonconformal domain decomposition methods for solving large-scale multi-region electromagnetic problems
… method for simulating large finite semi-periodic arrays. For a plane wave incident on a planar boundary at a certain specified angle, this boundary condition can be tuned to be reflectionless for all frequencies and polarizations. Fifth, waveguide modal fields are employed to expand the dual …