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 23 for “"Dual-stage"”.
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Dual-stage Thermally Actuated Surface-Micromachined Nanopositioners
… of freedom; some are composed of multiple stages that stack together. Both macro-scale and micro-scale nanopositioners have been fabricated. A summary of recent research in micropositioning and nanopositioning is presented to set the background for this work. This research project …
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Investigation of Dual Stage Acridones as a Potent Malaria Treatment
<p>The need for potent antimalarials to prevent the emergence of drug resistant <em>Plasmodium falciparum</em> is urgent. Discovery of novel acridone chemotypes have shown promise for a new antimalarial drug treatment. Presently, two acridone chemotypes have intrinsic antimalarial potency against …
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Probing the mechanisms of action and resistance of mixed-ligand platinum(II) complexes with dual-stage antiplasmodium activity
… compounds with novel mechanisms of action (MoA), dual-stage activity, and with immutable targets. Until now, drug discovery has typically focused on the development of antimalarials that are entirely organic in composition. This has left the field of inorganic medicinal chemistry and transition …
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Robust Repetitive Control and Its Application
… of camshaft to show their effectiveness. A dual stage actuator using an electrohydraulic actuator and a piezoelectric actuator is developed to further reduce cam profile tracking errors. The design, modeling, analysis and preliminary control design of the dual stage actuator are presented. …
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Control of Multiple Degree of Freedom Fast Tool Stages for Noncircular Turning Process
… A robust repetitive controller is designed for a dual stage actuator system and it demonstrates the tracking performance improvement through a dual stage actuator system. The dual stage actuator system has a piezoelectric actuator inside of the hollow piston of an electrohydraulic actuator system, …
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The Investigation of Ca0.6Mm0.4Ni5 for Use in a High Pressure Metal Hydride Hydrogen Compressor
… of the design, construction, and testing of a dual stage metal hydride hydrogen compression system intended to be used with lower grade geothermal or waste energy sources. The metal hydrides used in this study were LaNi5 and Ca0.6Mm0.4Ni5. A FTT model was also developed and the model proved …
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Performance characterization of electrohydrodynamic propulsion devices
… electrohydrodynamic thrusters of single- and dual-stage configurations were tested. Single-stage thrusters refer to a geometry employing one emitter electrode, an air gap of length d, and a collector electrode with large radius of curvature relative to the emitter. Dual-stage thrusters add a …
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A hybridized discontinuous Galerkin formulation for modeling electrohydrodynamic thrusters
… an analytical solution and parallel wire single stage and dual stage thruster performance data from the literature. The model problem consists of concentric cylinders with charge density and potential specified on the inner and outer cylinders. The inner cylinder is offset to test the charge …
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Developing materials and methods for remediation of metaldehyde from drinking water
… the most cost-effective one. Therefore, a novel dual-stage method was developed using MN502 as a heterogeneous catalyst to degrade metaldehyde into acetaldehyde. Experimental demonstrations showed that acetaldehyde can be completely removed by amine functionalised ion-exchanger A830. The …
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A Novel Approach To Residence Time Distribution
… bed riser. The instrument was implemented in a dual-stage transparent scale model fluidized bed riser. Testing of the instrument system validated the functionality of the instrument. It was proven to be capable of determining both localized and total Residence Time Distribution in a fluidized …
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Moment Matching and Modal Truncation for Linear Systems
… when applied following an initial reduction stage by moment matching. A bound on the norm of the difference between the transfer functions of the moment-matched system and its modally-filtered counterpart yields an intelligent choice for the mode of truncation. The dual-stage algorithm …
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Obstacle Detection and Avoidance System for Unmanned Aerial Vehicles Based on Monocular Camera
… path planning using a monocular camera. Our dual-stage system combines traditional detection methods like background subtraction with advanced deep-learning techniques for improved reliability to create initial detection zones, further refined by target tracking methods for increased accuracy …
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Automating systematic literature reviews in healthcare: leveraging artificial intelligence for enhanced evidence-based decision making.
… these challenges by identifying the specific stages of the SLR process that are most laborious and exploring the application of state-of-the-art (SOTA) artificial intelligence (AI) techniques to enhance their efficiency. The thesis presents an online survey conducted to gather insights from …
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Fast star tracker centroid algorithm for high performance CubeSat with air bearing validation
… on the order of arcseconds. ExoplanetSat uses dual stage control to achieve the pointing requirement. Reaction wheels provide coarse satellite attitude control while a high bandwidth piezoelectric stage performs fine optical stabilization. The optical sensor provides star images from which a …
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Nondestructive investigation of soil moisture level using optical system
… respectively, used in the development of the dual-stage multiclass ANN model, wherein measurement of light attenuation (from nondestructive system) was correlated with percent soil moisture (from destructive gold standard approach). Since there is a considerable overlap in the value of the …
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Production Analysis in Tight/Shale Reservoirs Via Machine Learning Approaches
… by advancements in horizontal drilling and multi-stage hydraulic fracturing technologies. These innovations have enabled the economical extraction of hydrocarbons from formations characterized by low permeability and complex fracture networks, positioning tight/shale gas as a pivotal component of …
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Thermodynamic modeling and design of high-performance adsorption-based atmospheric water harvesting devices
… show that the peak energy efficiencies of single-stage and dual-stage AWH devices, after considering temperature-dependent adsorption, increased by 30% and 100% compared with previous work. Moreover, in contrast to common understanding, we show that the adsorption enthalpy of MOFs can also be …
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Theoretical, computational and experimental analysis of the deflagration plasma accelerator and plasma beam characteristics
… The first is based on the number of acceleration stages. A single stage device processes neutral gas into the accelerated plasma. Multi-stage devices first ionize the neutral gas and then accelerate it to the final velocity. Finally, plasma accelerators with coaxial electrodes are classified by …
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An airborne X-band synthetic aperture radar receiver design and implementation
… and mixers were chosen to implement a dual-stage downconversion from a radio frequency (RF) of 9300 MHZ to a 2nd IF of 1300 MHZ and then to a 1st IF of 158 MHz. A sensitivity time control (STC) is implemented in the receiver to cater for the limited dynamic range of the ADC. The power …
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Sorption-based atmospheric water harvesting: from atoms to applications
… framework, we proposed a dual-stage device architecture inspired by multistage distillation in desalination, where condensation heat from one stage drives desorption in the next, increasing productivity and thermal efficiency. To guide materials selection based on operating …
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