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 27 for “"Dead Zone"”.
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Model reference adaptive control systems using a dead zone non-linearity
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.
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Drifting in the Dead Zone in Cyprus: the mediation of memory through expanded life writing
… a series of physical and conceptual border zones: the disciplinary and discursive boundaries between poetry and philosophy; the border between memory and identity; the border between collective and individual memory and the physical terrain of the border that divides Nicosia. The dérive, …
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Into "the Dead Zone" : racial violence and white supremacist genocide in Jim Crow Virginia, 1902-1951
Among former Confederate states, Black Americans in Virginia experienced the fewest lynchings during Jim Crow segregation. Accordingly, after a spree of highly publicized lynchings during the late 1920s, Virginia Governor Harry F. Byrd and other state officials deemed lynchings a threat to the …
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The three-state-polarity-coincidence correlation detector
… (PCC'), a two-input detection device with dead zone clippers, has been investigated in detail. A criterion is devised to compare two detectors. Comparisons are made between the PCC' and several other types of detectors. The superiority of the PCC' in the detection of a weak signal embedded …
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Multi-Branch Current Sensing Based Single Current Sensor Technique for Power Electronic Converters
… sensor regularly, and the current sensing dead-zone is dramatically reduced. Since the current sampling is performed periodically, its implementation using a digital controller is extremely simple. Moreover, the periodical dead-zone and the dead-zone near the origin of the voltage vector …
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Longitudinal dispersion in vegetated flow
… cases, as the vegetation provides a significant dead zone, which may trap scalars and augment dispersion. The dead zone process is not captured in the rough boundary model. This thesis describes a new theoretical model for longitudinal dispersion in a vegetated channel, which isolates three …
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Magnetohydrodynamics in the Inner Regions of Protoplanetary Discs
… discs, which encompass the putative habitable zone, comprise a highly ionised, turbulent active region and a poorly ionised outer dead zone. The complex magnetohydrodynamic processes at this dead–active zone interface significantly impact the disc's evolution – influencing global magnetic flux …
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On Detonation Diffraction in Condensed-Phase Explosives
… The higher order DSD relation predicts a small dead zone at the corner, an improvement over the quasi-steady theory.
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Nonlinear and Hybrid Feedbacks with Continuous-Time Linear Systems
… a switching-reset mechanism, and an adaptive dead-zone. This setup resembles the Lure problem studied in the absolute stability framework, but the types of nonlinearities considered here do not satisfy (in general) a sector condition. These nonlinear blocks give rise to a whole range of …
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Lost Lake Park: Perceiving Site History through a Recreation Landscape on Lake Union
… land, it creates a node of activity in a current dead zone in the transit corridor between the University of Washington and downtown. On water, the site connects to a greater context of parks that exist on Lake Union, unifying the neighborhoods beyond that are presently separated by the lake. …
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The Solution In The Sea: New York recently legalized commercial kelp farming. Will it help solve the state's environmental and economic woes?
… transformed the Long Island Sound into a dead zone. Though the area has somewhat recovered, the people and marine life that rely on these waters still feel the impact decades later. Many are hoping that kelp farms can help. Kelp farming is a nature-based mitigation strategy that removes …
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Data-Driven, Non-Parametric Model Reference Adaptive Control Methods for Autonomous Underwater Vehicles
… reference adaptive control strategy based on a dead zone robust modification, and derives conditions for the ultimate boundedness of the tracking error in this case. The second controller is an implementation of the Gaussian Process MRAC developed by Chowdhary, et al. I discuss the method of …
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Control of Piecewise Smooth Systems: Generalized Absolute Stability and Applications to Supercavitating Vehicles
… modeled as a piecewise smooth system with a dead zone. The strong nonlinear planing force plays an important role in determining the dive-plane dynamics. To design control laws that stabilize the dive-plane motion, the necessary and sufficient condition for generalized absolute stability of …
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Parameter estimation and control of nonlinearly parameterized systems
… and is shown to lead to bounded errors. A dead-zone based adaptive filter is also proposed and is shown to accurately estimate the unknown parameters under some conditions. Based on the adaptive estimation algorithms above, a Continuous Polynomial Adaptive Controller (CPAC) is developed and …
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Architecture and/in place: Studying the physical and contextual connection between buildings and landscape
… a public park leading to the museum uplifts a dead zone along the road. The building form developed by framing views and extending the building into the landscape, ultimately forming a route linking the museum to the historic sites mentioned earlier. In doing so, the design considers what …
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Efficient Control of DC Servomotor Systems Using Backpropagation Neural Networks
… and dynamic factors, such as backlash, dead zone and Coulomb friction that make the systems hard to control using conventional control methods such as PID controllers. Also, the dynamics of the servomotor and outside factors add more complexity to the analysis of the system, for example …
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Hydrodynamics and Transient Heat Transfer Characteristics in Fluidized and Spouted Beds
… solid circulation rates, average cycle times, dead zone sizes, jet merging effects, gas void fraction distributions, and maximum expanded bed heights. The heat transfer in fluidized and spouted beds containing a heated inlet gas source was studied through transient heat transfer measurements …
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Nonlinear algorithms for fast and robust control of electrical drives
… prevented by using a high gain, "variable dead zone" nonlinearity as a local feedback over the integrator. Recently proposed soft variable structure (SVS) control, derived by using the Liapunov direct method, is modified so that the algorithm can be implemented with only the output …
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Stream Habitat Characterized by Stage -Specific Flows and Three-Dimensional Geomorphological Complexity: Development of Ecological Criteria for Stream Restoration Design
… eddy, expansion eddy, and local hydraulic dead zone at margins. Near bankfull flow, floodwaters inundate geomorphic features in a channel-floodplain transition area, forming three additional high-flow units, which included the concave-bank bench, vegetated point bar platform, and floodplain …
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Physical criteria for wetland targeting on a watershed scale
… is considered a major cause of hypoxia and the dead zone in the Gulf of Mexico. Wetlands have been shown to be a cost-effective solution for reducing nitrate pollution in the Upper Mississippi River Basin. To improve wetlands’ ability to remove nitrogen loads, research has suggested that sites …
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