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 20 for “"dithering"”.
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Implementation of dithering digital ripple correlation control for photovoltaic maximum power point tracking with windowed sensing
… (PV) system. In these scenarios, PWM dithering can be used to improve average PWM resolution. This thesis provides the hardware demonstration of a control technique that uses ripple correlation control (RCC) on the dithering ripple, thereby achieving simultaneous fast tracking speed …
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MOSFET Current Source Gate Drivers, Switching Loss Modeling and Frequency Dithering Control for MHz Switching Frequency DC-DC Converters
… at 10MHz. The proposed method uses frequency dithering to reduce the clock frequency demands of the digital controller.
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Evaluation of advanced air-fuel ratio control strategies and their effects on three-way catalysts in a stoichiometric, spark ignited, natural gas engine
… affecting engine performance. Air-fuel ratio dithering is a strategy that can be used to increase catalyst reduction efficiency by utilizing the oxygen storing properties of ceria, a material in the catalyst washcoat. Dithering is a method of periodically varying the air-fuel ratio of the …
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Performance of four-stage cascaded fiber optical parametric amplifier (FOPA) using optisystem
… The first work focusses on the effects of pump dithering to the cascaded FOPA, while the second work discusses the effects of passive components to cascaded FOPA. The passive components selected are isolator and optical bandpass filter (OBPF). The results show that the FOPA with pump dithering …
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Manipulations of spike trains and their impact on synchrony analysis
… around their original position (referred to as dithering). I provide analytical expressions of the probability of coincidence detection after dithering. The effectiveness of spike dithering in creating surrogate data strongly depends on the dithering method and on the method of counting …
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Modeling transient multiphase flow and mold top surface behavior in steel continuous casting
… applied to investigate the effects of slide-gate dithering on transient single- and multi- phase flows in the caster mold. Mold sloshing is identified by both plant experiments and numerical simulations when the dithering frequency matches with the mold natural frequency determined by its …
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Maximum Power Point Tracking Using Kalman Filter for Photovoltaic System
… and simplicity. The P&O usually requires a dithering scheme to reduce noise effects, but the dithering scheme slows the tracking response time. Tracking speed is the most important factor for improving efficiency under frequent environmental change. The proposed method is based on the Kalman …
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Adaptive control of a linear system with quantized state observations
… with white noise disturbance by applying a dithering method. It is shown that system with quantization error can be controlled with the same one-step-ahead control law and projection algorithm.
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A global maximum power point tracking DC-DC converter
… illumination. The converter switches between a dithering algorithm which tracks the local maximum and a global search algorithm for ensuring that the converter is operating at the true global maximum.
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ANALYSIS AND DESIGN OF PERIODICALLY TIME-VARYING DIGITAL FILTERS
… optimal structure is time-invariant (i.e., non-dithering). In addition to analyzing previously developed filters, a new class of filters, called operator filters, was found using the techniques developed in this thesis.
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Adoption of building information modeling in developing countries: a phenomenological perspective
… the clear understanding of best practices, are dithering whether to adopt this technology. The scope of this study was how to facilitate BIM adoption in developing countries. A phenomenological design approach was considered to seek early adopters’ and BIM professionals’ lived experiences on …
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Novel load identification techniques and a steady state self-tuning prototype for switching mode power supplies
… is based on the system step response, while dithering amplification effects are exploited for the steady state SI method. The open loop method can be used as autotunig approach during or before the system start up, a step evolving reference voltage has been used as system perturbation and to …
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DISTRIBUTED PHASED ARRAY ANTENNAS IN WIDE AREA RFID
… spatially distributed antennas and phase dithering. This implements a far-field beamforming that maximises the instantaneous power at a tag. Separately, phased array antennas have also been used to increase the read range by increasing the effective field of view of an antenna and …
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Spectral dynamics of single quantum dots : a study using photon-correlation Fourier spectroscopy for submillisecond time resolution at low temperature and in solution
… at different interferometer positions while dithering one mirror, a time dependent spectral correlation function is obtained. From this, we learn about the temporal evolution of the emission line shape at timescales approaching the lifetime of the emitter. In this body of work, we both apply …
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On Robotic Assembly using Contact Force Control and Estimation
… increase the accuracy of force estimation using dithering to decrease the effective friction level is proposed. Lead-through programming, to manually guide the robot, is useful for simple and intuitive robot programming. The thesis presents a method for performing such lead-through programming …
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Single-Objective Tilted Light Sheet Illumination with Exchange-PAINT and Deep Learning for Fast, Accurate, and Precise 3D Single-Molecule Super-Resolution Imaging in Mammalian Cells
… combined with the additional innovations of (i) dithering of the light sheet for artifact reduction, (ii) a 3D-printed microfluidic chip for control of the extracellular environment and reflection of the light sheet into the sample, (iii) sequential DNA Point Accumulation for Imaging in Nanoscale …
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Advanced fibre gratings and their applications
… Two specific techniques - slow-shifting and fast-dithering the phase-mask implemented by a computer controlled piezo - were developed to write high quality phase-shifted, sampled and apodised gratings. A large number of LabVIEW programmes were constructed to implement standard and novel …
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Metody ditheringu obrazu
Bákalárska práca sa zaoberá problematikou ditheringu obrazu. Cieľom práce je zosumarizovať bežné i moderné metódy rozpytlovania obrazu vrátane všetkých ich derivátov. Úvodná časť tejto práce vysvetlí dôležité pojmy, ktoré úzko súvisia s danou problematikou. V nasledujúcej časti bakalárska práca …
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Design, Analysis and Fabrication of Complex Structures using Voxel-based modeling for Additive Manufacturing
A key advantage of Additive Manufacturing (AM) is the opportunity to design and fabricate complex structures that cannot be made via traditional means. However, this potential is significantly constrained by the use of a facet-based geometry representation (e.g., the STL and the AMF file formats); …
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First Leptonic Probe of Neutron Radii in Lead at Low-Q2
<p>Over the past decade, in Hall-A of the Thomas Jefferson National Accelerator Facility (TJNAF), both the HAPPEX and PREx collaborations have carried out various high-precision polarized elastic electron scattering experiments to explore the nuclear structure, the nucleon form factor and the weak …