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.
Results
Showing 1 to 20 of 30 for “"switching times"”.
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Real-time optimal control of autonomous switched systems
… systems are open-loop in nature. Therefore, the switching times of the system can not be adjusted or adapted when the system parameters or the operational environments change. This thesis aims to close this loop, and apply adaptations to the optimal switching strategy based on new information …
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OPTICAL BISTABILITY IN ZINC-SULFIDE AND ZINC-SELENIDE THIN-FILM INTERFERENCE FILTERS AND IN GALLIUM-ARSENIDE AND COPPER-CHLORIDE ETALONS (NONLINEAR).
… with ZnS and ZnSe spacers is observed with switching times ≳ 200 μs. The accompanying drifting of the bistability loop in time and laser-induced "damage" indicate a thermal mechanism. The problem of water vapor absorption in such filters must be addressed before the inherent potential and …
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Stress and loss analysis of quasi-resonant converters
… recently in the effort of increasing the switching frequency and reducing the switching losses. There are several merits and demerits of this class of converters. The most important aspects of this research are to assess the advantages and limitations of QRCs in terms of their device …
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Traffic Signal Phase and Timing Prediction: A Machine Learning and Controller Logic Hybrid Approach
… systems require reliable estimates of signal switching times to improve vehicle energy/fuel efficiency. Deployment of successful infrastructure to vehicle communication requires Signal Phase and Timing (SPaT) messages to be populated with most likely estimates of switching times and confidence …
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Genetic and Biochemical Characterization of Methanol Utilization in Methanosarcina Acetivorans C2A: Analysis of the Methanol:methyl-Coenzyme M Methyltransferase System Encoded by mtaCB and mtaA
… mtaCB1 or mtaCB2 alone had similar generation times, rates of methane production, and cell yield to wild type, but exhibited longer methanol-switching times, while strains with mtaCB3 alone displayed a lower capacity to utilize methanol. The methanol:CoM methyltransferase activity of mtaCB1 was …
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Investigation of digital pump/motor control strategies
… a new set of valves which could deliver faster switching times. When tested at 103 bar differential pressure, 500 rpm at 120 F, these valves provided up to 50% improvement in switching times, resulting in up to 15% simulated increase in the digital pump/motor’s overall efficiency and up to 12% …
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EXTREME VERTICAL DISPLACEMENT, HIGH FORCE, SILICON MICROSTAGE ZIPPER ACTUATORS
… up to 1 mN, pull-in voltage as low as 20 V, and switching times of 1 ms.
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Interface issues in induction motor drives
… of cable length and power semiconductors switching times on motor overvoltages are studied for different rise times and cable lengths. Simulation studies are carried out using the EMTP software package. Simulation results are verified experimentally.
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Application of model predictive control on wind farm incorporated with dual battery energy storage system
… the reference power by reducing the battery switching times and extending the life of the battery.
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Adaptive mesh construction for the numerical solution of stochastic differential equations with Markovian switching
… stochastic differential equations with Markovian switching. Such equations describe the stochastic dynamics of processes where the drift and diffusion coefficients are subject to random state changes according to a Markov chain with finite state space. We propose a variant of the Jump …
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Microwave Signal Generation Using Self-Heterodyning of a Fast Wavelength Switching SG-DBR Laser
… hardware structure of the high-speed wavelength switching SG-DBR package is shown. The wavelength switching architecture and temperature robustness of the laser will also be presented. Microwave signals up to 17 GHz have been generated by frequency modulating the phase section of the laser. …
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RF MEMS switches : survey and analysis
… limited power handling capabilities, and slow switching times. Nonetheless, MEMS switches are poised to provide advantages over other switching technologies. The goal of this thesis is to understand the limits of their operation and predict their impact in practical applications. To that end, …
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Nano Vacuum Channel Devices for Electronics and Ultrafast Nanophotonics
… radiation hardness, integrability, and ultrafast switching times. Planar NVC devices are ideal candidates for electronics that need to operate in harsh environments such as space. Moreover, recent work, some of which is discussed in this thesis, has demonstrated a rectified, field driven current …
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Low-latency trajectory planning for high-speed navigation in unknown environments
… reduces the planning problem to finding the switching times for the minimum-time optimal solution, something that can be done in microseconds. Our approach generates collision-free trajectories within a millisecond of receiving perception data. This is two orders of magnitude faster than …
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Dynamic regulation of bacterial metabolic pathways using autonomous, pathway-independent control strategies
… are expressed, such as to build biomass before switching on growth-limiting production pathways, or accumulating intermediates to drive the reaction of a promiscuous enzyme along a certain branch. In this thesis, we propose enzyme control strategies that are independent of any biosynthetic …
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High Temperature Characterization and Analysis of Silicon Carbide (SiC) Power Semiconductor Transistors
… gate resistance, and the turn on and turn off switching times and energies. For the latter, the driving method used for each device is described in detail. Furthermore, for the devices that require on-state dc currents, driving losses are taken into consideration. While all of the SiC …
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Mathematical models for bistable nematic liquid crystal displays
… on controlling surface anchoring conditions. Switching between the two stable steady states is achieved by application of a transient electric field. A 1D model is considered first, and means are explored, by which the design may be optimized, in terms of optical contrast, manufacturing …
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Shape and Topology Optimization for electro-mechanical energy converters
… power applications, involves, on the other hand, switching components with very low switching times and always increasing current levels. Passive components in these devices (busbars, inductors, transformers) must be designed to be com- pact without compromising their performance (e.g. power …
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Multi-layer, Low-crosstalk Integrated Optical Switches
… data-intensive applications necessitates optical switching technologies with ultra-low crosstalk, high bandwidth, and nanosecond-scale reconfigurability. This work presents a comprehensive study of 3D Si-SiN-SiN tri-layer optical switches employing switch-and-select (S&S) architectures for …
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Signal processing and decision making in single cells
… between these two stable states, we measure switching dynamics in a population of cells. A simple model is constructed that can make predictions about system behavior unavailable from a deterministic model. Further, by measuring individual switching events in a similar bistable system …
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