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 497 for “"far-field"”.
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Visual attention models for far-field scene analysis
… others. We apply this concept to the domain of far-field activity analysis by addressing the problem of determining where to look in a scene in order to capture interesting activity in progress. We pose the problem of attention as an unsupervised learning problem, in which the task is to learn …
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Classifying tracked objects in far-field video surveillance
… are detected and tracked in a variety of far-field video sequences, captured by a static, uncalibrated camera. We introduce the use of scene-specific context features (such as image-position of objects) to improve classification performance in any given scene. At the same time, we design a …
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Far field RF power extraction circuits and systems
… that collects RF power at low electromagnetic field strengths. This system enables a substantial increase in the operating range of remotely powered devices.
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Motion pattern analysis for far-field vehicle surveillance
… this thesis is to analyze the motion patterns in far-field vehicle tracking data collected by multiple, stationary non-overlapping cameras. The specific focus is to fully recover the camera's network topology, which means the graph structure relating cameras and typical transitions time between …
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UAV-based Far-Field and Near-Field Antenna Measurements
L'abstract è presente nell'allegato / the abstract is in the attachment
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Overcoming the far-field diffraction limit via absorbance modulation
Diffraction limits the resolution of far-field lithography and imaging to about half of the wavelength, which greatly limits the capability of optical techniques. The proposed technique with absorbance modulation aims to get around the diffraction limit by using wavelength-selective chemistry to …
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Photonic engineering of near- and far-field radiative heat transfer
… enhance radiative heat transfer from the near-field to the far-field regimes. We start by investigating the application of thin-film morphologies to different types of materials in the near-field regime using a rigorous fluctuational electrodynamics formalism. For thin-film semiconductors, …
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Using far-field measurements for determining mixed-mode interactions at interfaces
… method to extract mixed-mode TSRs using only the far-field measurements. The first topic of the dissertation deals with extracting mixed-mode TSRs based on a combination of global and local measurements including load-displacement, crack extension, crack tip opening displacement, and fracture …
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Nodal photolithography : lithography via far-field optical nodes in the resist
… of optical lithography. This approach uses farfield optical nodes to orchestrate reversible, saturable optical transitions in certain photoresist compounds. After addressing prior work in resolution enhancement via optical nodes (for metastable atom localization, reversible absorbance …
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Coupled near and far field thermal plume analysis using finite element techniques
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1981.
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Seasonality of the Agulhas Current with respect to near- and far-field winds
… simulated, agreeing well with observations. Near-field winds, to the west of 35◦E, dominate this seasonality, as signals from more remote wind forcing dissipate due to destructive interference while crossing the basin. Local winds driving coastal upwelling/downwelling directly over the Agulhas …
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Numerical and analytical modelling of downhole seismic sources--the near and far field
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Ocean outfall modeling--interfacing near and far field models with particle tracking method
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Use of Improved Far -Field Boundary Conditions to Compute External Flows on Reduced Domains
We have also used this computational approach to study, for the first time, flow past a convex axisymmetric body formed by a finite paraboloid with a paraboloidal surface closing the aperture. Converged flows were computed for three different aspect ratios up to a Reynolds number (Re) of 200. For …
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Surface phonon polaritons coupled to the far-field by a grating at high temperature
… polaritons (SPhP) in quartz coupled to the far field by gratings, and the temperature dependence of SPhP coupled to the far field. The subject of coupling SPhP to the far-field has been studied in the past, but not at high temperature. Devices proposed to control radiative heat transfer …
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Finite and Spectral Element Methods for Modeling Far-Field Underwater Explosion Effects on Ships
The far-field underwater explosion (UNDEX) problem is a complicated problem dominated by two phenomena: the shock wave traveling through the fluid and the cavitation in the fluid. Both of these phenomena have a significant effect on the loading of ship structures subjected to UNDEX. An approach to …
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Computationally-effective Modeling of Far-field Underwater Explosion for Early-stage Surface Ship Design
… simulation of the ship response to a far-field UNDEX which involves fluid shock waves, cavitation, and fluid-structural interaction. Traditional fluid numerical simulation approaches using the Finite Element Method to track wave propagation and cavitation requires a high-level of mesh …
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CMOS THz-ID: A 1.6mm² Package-Less Identification Tag Using 260-GHz Far-Field Backscatter Communication
… size is the smallest among all prior RFIDs using far-field communications.
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