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 15 of 15 for “"Stability Improvement"”.
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Cs-Pb-Br Core-shell Perovskite Microcrystals for Stability Improvement
… research of LHP NCs. However, their lack of stability to external elements, including light, humidity, and heat limits their use in practical applications. Heterostructure development is one of several approaches to overcome these limits. Combining two or more materials at the nanoscale …
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Power System Stability Improvement with Decommissioned Synchronous Machine Using Koopman Operator Based Model Predictive Control
Traditional generators have been decommissioned or replaced by renewable energy generation due to utility long-standing goals. However, instead of flattening the entire plant, the rotating mass of generator can be utilized as a storage unit (inertia resource) to mitigate the frequency swings during …
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SMALL SIGNAL STABILITY ANALYSIS OF THREE-PHASE MICROGRID SYSTEM IN THE PRESENCE OF CONSTANT POWER LOADS
Small-signal stability is of great concern for three-phase microgrid systems with regulated power converters which are used for connecting multiple distributed energy resources (DERs) and in various motor drive applications. The converters behave as constant-power loads (CPLs) and cause instability …
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Solution-processed doping in CdTe thin film solar cells
… solar cells allows for efficiency increases and stability improvement in CdTe devices. By varying the doping concentration, activation annealing temperatures, and deposition parameters, the root cause for the increased power conversion efficiency was investigated. Group I and Group V dopants …
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Electric Machine Differential For Vehicle Traction Control And Stability Control
… advanced road adhesion controls and vehicle stability controls. Electric machine differential (EMD) is such a concept under current investigation for applications in the near future. Reliability of a power train is critical. Therefore, sophisticated fault detection schemes are essential in …
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Continuous synthesis of metal halide perovskite nanoparticles with sharp and stable emission
… perovskite nanoplatelets. In addition, the stability of these materials is relatively low, hence requiring further development. This thesis focuses on the controllable synthesis of caesium lead halide (CsPbX<sub>3</sub>) nanoplatelets (NPls) with size tunability and phase purity using …
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Stabilisation of diazo compounds used in lithographic systems.
… and para electron donating substituents improved stability. The counterion used also had an influence on diazonium stability. Tetrafluoroborate salts were found to be more stable than hexafluorophosphates. Diazonium salts with other counterions were also prepared and the short chain alkyl …
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Laboratory implementation of unified power flow controller hardware-in-loop simulation
… lines of the power grid, maintaining voltage stability, and damping oscillations. The rapid development of the power electronics industry has made FACTS devices increasingly attractive for utility deployment due to their flexibility and ability to effectively control power system dynamics. The …
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Enzymatic fuel cells via synthetic pathway biotransformation
… and expressed for improving the lifetime and stability of the cell. To further increase the power output, non-immobilized enzyme system was demonstrated to have higher power densities compared to those using immobilized enzyme system, due to better mass transfer and retained native enzyme …
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Multiscale Microstructural Investigation of the Ductile Phase Toughening Effect in a Bi-phase Tungsten Heavy Alloy
… nuclear fusion reactors. Their high temperature stability, improvement in fracture toughness over other brittle candidates, and promising performance in initial experimental trials have demonstrated their utility, and recent advancements have been made in understanding and applying these …
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Nanolaminate coatings to improve long-term stability of plasmonic structures in physiological environments
… are investigated to improve their long-term stability in corrosive physiological environments. The structures are fabricated using phase-shifting PDMS masks, e-beam deposition, RIE, Atomic Layer Deposition and Rapid Thermal Annealing. An alternate approach using Nanosphere Lithography (NSL) …
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EFFECTS OF VESTIBULAR TRAINING ON POSTURAL CONTROL OF HEALTHY ADULTS
Background: Postural stability is maintained by the central integration of the multisensory inputs to produce motor outputs. When visual and somatosensory input is available and reliable, this reduces the postural control system’s reliance on the vestibular system. Despite this, vestibular loss can …
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Control and Time Integration Algorithms for Real-Time Hybrid Simulation
… by means of frequency response functions and stability analysis were carried out. In order to facilitate delay compensation, another novel compensation scheme characterized by overcompensation and optimal feedback was conceived. Numerical simulations and realistic RHS were performed to examine …
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A Study of Methods for Improving the Dynamic Stability of High-Speed Turbochargers
… 150,000 rpm. The bearing fluid-film whirl instability is the main source of the subsynchronous vibration. The nonlinear reaction forces inside the bearings are usually causing the rotor to whirl in a limit cycle but may become large enough to cause permanent damages. Additionally, the …
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Design of metasurfaces for detection system application
… absorbers (MTAs) with improved angular stability performance, suitable bandwidth and certain conformability are introduced and a comparison with literature contributions supports this enhanced behavior. Furthermore, a MTA is combined with an antenna to reduce its Radar Cross Section …